Doc #32 — Paper Production From NZ Pulp

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RECOMMENDED ACTIONS (BY URGENCY)

First week

1. Classify Kinleith and Kawerau mills as essential national infrastructure. Ensure continued grid power supply, protect the sites, and prevent any uncontrolled shutdown that could damage the recovery boiler or chemical recovery system.

First month

2. Retain mill workforce. The 700–900 people employed across Kinleith and Kawerau collectively hold the operational knowledge for running kraft pulp mills — digester operation, recovery boiler management, paper machine operation, chemical recovery, and maintenance.² These workers are among the most critical personnel in the recovery. If they disperse, the knowledge required to restart these mills may take years to reconstruct.
3. Inventory chemical stocks at both mills. Determine remaining stocks of sodium hydroxide, sodium sulfate, bleaching chemicals (chlorine dioxide, hydrogen peroxide), sizing agents, and other process chemicals. Estimate how long the mills can operate on existing chemical stocks before domestic production is needed.
4. Inventory spare parts and maintenance condition. Paper machines, digesters, recovery boilers, and lime kilns are complex equipment with wear components. Establish what spare parts exist on-site, what the maintenance backlog looks like, and what components are most likely to fail.

First 3 months

5. Assess paper machine adaptability for printing-grade paper. This requires the mill’s own process engineers — they understand their machines’ capabilities and limitations. The question: can the existing containerboard machines produce paper at 60–100 g/m² basis weight with acceptable formation, surface smoothness, and sizing? What modifications are needed?
6. Begin trials of unbleached kraft paper for manual printing. Even without machine modification, existing containerboard production can be tested for letterpress and screen printing compatibility. If containerboard at lighter basis weights works adequately for screen printing, this provides an interim paper supply while machine adaptation proceeds.

First year

7. Commission paper machine modifications. Install or adapt a size press for surface sizing with potato or wheat starch. Adjust headbox, forming, pressing, and drying sections for lighter basis weights. Begin trial runs of printing-grade paper.
8. Establish domestic chemical production pathways. Begin chlor-alkali cell construction for sodium hydroxide and chlorine (Section 4). Establish starch production from NZ agricultural feedstocks. Source limestone for calcium carbonate filler.
9. Begin community-scale papermaking trials at locations distant from the main mills (Section 7). Using hollander beaters or small mechanical refiners, test small-scale paper production from locally pulped radiata pine, recycled waste paper, and alternative fibres.

Years 2–3

10. Transition to routine paper production at Kinleith and/or Kawerau. Printing-grade paper enters regular production alongside packaging grades. Paper distributed to print shops nationwide.
11. Establish bleaching capability if cream or white paper is desired. Oxygen delignification is the first step; hypochlorite bleaching follows once chlor-alkali production is operational (Section 4.3).
12. Scale community-scale production at 3–5 regional sites to supplement main mill output and reduce transport dependency.

Years 3–7

13. Steady-state operations. Paper production from NZ radiata pine is a routine ongoing activity, sustained indefinitely from domestic materials and renewable energy.

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ECONOMIC JUSTIFICATION

Labour requirements by role

The workforce required to sustain paper production at Kinleith and/or Kawerau, and to establish the chemical production support chain, breaks down across four categories:

Mill operations — approximately 120–220 person-years per year:

• Chemical engineers and process specialists (10–20 people): Digester control, chemical recovery loop management, bleaching sequence oversight, paper machine process optimisation. These are the scarcest workers in the system — they carry process knowledge that took years to develop and cannot easily be reconstructed from textbooks. They direct operations and troubleshoot; they are not interchangeable with general labour.
• Paper machine and finishing operators (40–80 people): Running the paper machine headbox, forming, pressing, drying, size press, calender, and reel sections. Modern paper machines are continuous, 24-hour operations requiring 3–4 crews in rotation. Each crew needs 10–20 people depending on the degree of automation that remains functional.
• Recovery boiler and lime kiln operators (15–25 people): The most critical operational team at the mill. The recovery boiler runs continuously and cannot be left unsupervised — a smelt-water explosion from a leaking tube can destroy the boiler and kill operators. Three rotating crews of 5–8 people each.
• Maintenance and engineering (30–60 people): Millwrights, electricians, instrument technicians, welders, riggers. Paper mills are mechanically intensive — pumps, fans, drives, conveyors, steam systems, and rotating machinery require constant attention. Maintenance backlog is the most common reason mills degrade.
• Quality control and laboratory (5–10 people): Testing pulp kappa numbers, paper basis weight, smoothness, sizing, and print quality. Can be reduced to a small team under recovery conditions, but quality feedback loops are essential for consistent output.
• General mill labour — stores, logistics, site services (20–30 people): Non-specialist roles that can be filled from displaced factory workers with modest training.

Chemical production support — approximately 20–50 person-years per year:

• Chlor-alkali cell construction and operation (10–20 people during construction; 8–15 ongoing): Building and running electrolysis cells for sodium hydroxide and chlorine production. Construction requires electrical and chemical engineering supervision; ongoing operation is semi-skilled.
• Starch production (3–8 people): Wet milling from potatoes or wheat — washing, grating, settling, and drying. Can be operated by workers with food processing experience, though consistent starch quality requires attention to settling times and drying temperatures.
• Limestone grinding and supply (5–15 people): Quarrying, crushing, and fine grinding for calcium carbonate filler. Standard extractive industry labour.

Forestry and wood supply — approximately 50–100 person-years per year:

The exact allocation depends on how much of Kinleith’s wood supply chain is already operational for timber uses. Wood supply for paper does not require dedicated specialists — forestry harvesting and chipping can use the same workers serving the broader timber industry (Doc #99). Approximately 20–30% of the plantation forestry workforce would be allocated to pulpwood supply at recovery-era production levels.

Community-scale production — approximately 15–75 person-years per year:

Three to five regional papermaking sites, each with 5–15 workers, producing coarser paper for local administrative and educational use using simplified soda or lime pulping methods (Section 6).

Grand total: approximately 205–445 person-years per year for the full domestic paper supply chain.

For context, NZ’s labour force under recovery conditions will be substantially redirected from pre-event employment patterns. Food production, infrastructure maintenance, and health care are the dominant demands. Paper production at this scale — 200–450 people — represents less than 0.1% of NZ’s working population of approximately 2.7 million. The specialist requirement (chemical engineers, recovery boiler operators) is perhaps 25–45 people nationally, most of whom are already employed at Kinleith and Kawerau and need only be retained in place, not recruited.

Comparison: production vs. rationing existing stocks

The stock scenario:

NZ’s pre-event paper imports ran at approximately 200,000–400,000 tonnes per year.³ This supply stops at the event. On-hand stocks — in warehouses, retail distribution, offices, schools, government buildings, and homes — represent perhaps 6–18 months of normal consumption. However, consumption will not be normal: laser printing collapses quickly (toner cartridges exhaust within 1–3 years even with careful management — Doc #5), and the economy contracts sharply, reducing paper demand by 60–80% from pre-event levels.

Under strict rationing (Doc #5), existing paper stocks probably last 5–10 years at recovery-era consumption levels. This is the baseline against which paper production must be compared.

The production scenario:

Kinleith, even at 20% of its nominal throughput, can produce 70,000–80,000 tonnes of pulp per year — roughly 50,000–60,000 tonnes of paper after conversion losses. NZ’s annual printing and writing paper requirement for recovery purposes is probably 5,000–20,000 tonnes — for the Recovery Library, government administration, educational materials, newspapers, and general correspondence. The mill can meet this requirement with a single adapted paper machine running at 10–15% of design capacity, while still producing packaging grades for food and goods distribution.

The gap between the two scenarios is not primarily about the quantity of paper produced — rationing alone can extend existing stocks for years. The gap is about what happens at the end of the stock period. Under rationing alone, NZ reaches a cliff: one year there is paper, the next year there is essentially none, with no recovery pathway. Under the production scenario, paper supply becomes permanent and self-renewing from domestic radiata pine.

Breakeven timeline

The economic question is when production investment pays back against the alternative of continued rationing.

Investment costs:

• Workforce retention at the mills costs nothing additional — these workers are already employed and already paid. The marginal cost of keeping them in place rather than dispersing them is approximately zero in direct terms. The real cost is the opportunity cost of their labour, addressed below.
• Paper machine adaptation — the engineering work of modifying Kinleith’s existing machines for lighter grades, adding a size press, adjusting the calender — represents approximately 6–18 months of engineering and millwright labour, perhaps 20–40 person-years of concentrated effort. This is a one-time cost.
• Chlor-alkali cell construction for bleaching chemicals represents another 10–20 person-years of construction effort.

Payback:

From the first usable tonne of printing-grade paper off the adapted machine, the investment is paying back. There is no extended non-productive period — the mills continue producing containerboard and packaging grades throughout the adaptation period, and the modification adds a printing-grade line to existing production. The adaptation cost is recovered within weeks of first production, measured against the alternative of importing or exhausting stocks.

The more meaningful breakeven question is: at what point does domestic production extend NZ’s paper access beyond what rationing alone could achieve? That point arrives by Year 5–8 of recovery, when rationed stocks are thinning significantly. If production is established by Year 2–3, NZ enters that period with a functioning domestic supply rather than facing the approaching cliff. If production is not established until Year 5–6 or later, the window for establishing the mill workforce and process knowledge may have closed as workers disperse.

The decisive constraint is not economics but time. The adaptation must begin before the mill workforce disperses and before critical equipment deteriorates from neglect. This makes the early actions in Recommended Actions time-sensitive regardless of the economic calculus.

Opportunity cost

The workers retained at Kinleith and Kawerau — particularly the 25–45 process engineers and recovery boiler operators — are highly skilled people who could potentially contribute to other critical recovery tasks. The opportunity cost question is: would these people produce more recovery value elsewhere?

The answer is almost certainly no, for the following reasons:

Chemical engineers and mill operators have narrow but essential specialisations. A Kinleith recovery boiler operator’s skills are not directly applicable to food production, construction, or medical care. They are, however, irreplaceable for running a kraft mill. Redeploying them to general labour tasks would waste their specialist knowledge. The reverse is not possible — you cannot train a general labourer to run a recovery boiler in less than 2–3 years.

The packaging function alone justifies retaining the mills. Even if printing paper is deprioritised, NZ needs corrugated board, kraft sacks, and wrapping paper for food distribution and goods packaging. The mill workforce that produces packaging produces printing paper as a marginal addition — the opportunity cost of printing paper production, net of the packaging function, is small.

Forestry workers are interchangeable. The 50–100 people allocated to pulpwood supply can be drawn from the broader forestry workforce; they do not represent a specialised opportunity cost. If timber production is the priority in a given region, pulpwood collection happens as a by-product.

Community-scale papermaking workers are low-opportunity-cost. The 5–15 workers per site are suitable for workers displaced from retail, hospitality, or light manufacturing — people who need productive roles in a contraction economy and who do not have specialist skills competing for other critical tasks.

The genuine opportunity cost falls on the maintenance workforce. Millwrights and electricians are in high demand across the recovery economy — power systems, water treatment, foundries, and machine shops all need them. Allocating 30–60 maintenance workers to the mills means 30–60 fewer workers for other infrastructure. This is a real trade-off that planners should acknowledge. The counter-argument is that a functioning paper mill is itself critical infrastructure, and its maintenance workers are not fully fungible with, say, hydro dam electricians (whose skills differ). The overlap in maintenance trades is significant but not complete.

Net assessment: The opportunity cost of running NZ’s paper mills at recovery-era production levels is low, because the primary workforce requirement (specialist process operators) has no valuable alternative deployment, and the secondary workforce requirement (general mill labour, forestry) draws from surplus labour pools. The genuine opportunity cost falls on the 30–60 maintenance workers, whose deployment to the mills should be weighed against competing infrastructure demands on a case-by-case basis.

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1. NZ’S EXISTING PULP AND PAPER INFRASTRUCTURE

1.1 The two mills

NZ’s pulp and paper production is concentrated at two sites, both operated by Oji Fibre Solutions (a subsidiary of Oji Holdings, Japan):⁴

Kinleith Mill, Tokoroa (South Waikato)

• NZ’s largest pulp and paper facility.
• Kraft pulp production capacity: approximately 350,000–400,000 air-dried tonnes per year.⁵
• Products: bleached and unbleached kraft pulp, containerboard (linerboard and corrugating medium).
• Has a complete kraft chemical recovery system: recovery boiler, lime kiln, causticising plant, evaporators. This recovery loop is the most capital-intensive component of a kraft mill and the reason Kinleith is irreplaceable — building a new recovery boiler would be a multi-year, multi-hundred-million-dollar project even under normal conditions.⁶
• Energy: generates substantial process steam and electricity from black liquor combustion in the recovery boiler, supplemented by bark-fired boilers and grid electricity.
• Water: draws from the Waikato River system — abundant supply.
• Workforce: approximately 400–500 people under normal operations.

Tasman Mill, Kawerau (Bay of Plenty)

• Produces both mechanical pulp (thermomechanical pulp, TMP) and kraft pulp.
• Products: tissue paper (consumer brands), market pulp.
• Energy advantage: connected to the Kawerau geothermal field, which provides process steam directly — this is a significant resilience advantage, as geothermal steam does not depend on any imported fuel or the broader electrical grid for its core heat supply.⁷
• Workforce: approximately 300–400 people.

What NZ does not have:

• No facility currently produces white printing and writing paper.
• NZ’s last newsprint machine (also at Kawerau) was shut down years ago.⁸
• No fine paper coating capability.

1.2 The gap: containerboard is not printing paper

Kinleith produces containerboard — the heavy brown board used for corrugated boxes. This differs from printing paper in several important ways:

Property	Containerboard	Printing paper
Basis weight	100–300 g/m²	60–100 g/m²
Colour	Brown (unbleached or semi-bleached)	White or cream (bleached)
Surface smoothness	Rough (adequate for corrugating)	Smooth (needed for clean print transfer)
Surface sizing	Minimal or none	Essential (starch sizing controls ink absorption)
Formation uniformity	Moderate	High (uneven formation causes print mottling)

The paper machines at Kinleith are configured for heavy grades. Running them at lighter basis weights requires adjustments to nearly every section of the machine — headbox flow rates, wire speed, press loading, dryer section temperature profiles, and tension control.⁹ This is a significant operational change, but it uses the same fundamental equipment. Paper machine operators and process engineers at the mill would understand these adjustments; external experts are not required, though the transition involves trial and error.

1.3 Why this matters: the recovery boiler

The kraft process generates enormous quantities of spent cooking liquor (“black liquor”) containing dissolved lignin and cooking chemicals. If this black liquor is discharged without treatment, the mill faces two problems: it loses its cooking chemicals, and it creates severe water pollution — black liquor has a biological oxygen demand high enough to render receiving waterways anoxic for kilometres downstream.¹⁰

The recovery boiler solves both problems. It burns the black liquor — the lignin provides the fuel energy — and recovers the sodium and sulfur as a molten smelt that is dissolved, causticised with lime, and returned to the cooking process as fresh white liquor. The lime kiln regenerates lime from the calcium carbonate produced in causticising. This closed loop means the kraft process, once running, consumes relatively little fresh chemical input — primarily sodium sulfate and lime makeup to compensate for losses.¹¹

Kinleith’s recovery boiler, lime kiln, and causticising plant represent the single most valuable piece of industrial infrastructure for paper production in NZ. Protecting and maintaining this equipment is a top priority.

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2. THE KRAFT PULPING PROCESS

This section describes the kraft process as it operates at NZ’s existing mills, with emphasis on the dependency chain for each stage.

2.1 Wood preparation

Process: Logs are debarked (mechanical drum or ring debarker) and chipped into uniform pieces approximately 20–30 mm long, 15–25 mm wide, and 3–8 mm thick. Chip uniformity matters — oversize chips undercook (producing undigested knots and shives) while undersize chips overcook (producing weak, damaged fibres).¹²

Dependencies: - Radiata pine logs — abundant (Doc #99). - Debarker and chipper maintenance — bearings, blades, hydraulic systems. Chipper knives are hardened steel and require periodic resharpening (Doc #39) and eventual replacement from NZ Steel feedstock (Doc #39). - Electricity — both machines run on electric motors. Available under baseline grid conditions.

Bark disposal: Bark is burned in a biomass boiler to generate steam, or composted. Under recovery conditions, bark boiler operation contributes to mill energy self-sufficiency.

2.2 Cooking (digestion)

Process: Wood chips are loaded into a digester — a large pressure vessel (Kinleith operates continuous digesters) — and cooked with “white liquor,” a solution of sodium hydroxide (NaOH, approximately 50–70 g/L) and sodium sulfide (Na₂S, approximately 20–40 g/L) in water. The cook proceeds at 155–175°C and corresponding steam pressure for 2–4 hours.¹³

The alkaline liquor dissolves lignin — the complex aromatic polymer that binds cellulose fibres together in wood — while leaving the cellulose fibres largely intact. Approximately 40–50% of the wood mass dissolves during cooking (principally lignin and hemicellulose). The remaining 50–60% is cellulose pulp.¹⁴

Kappa number: A measure of residual lignin in the pulp after cooking. Lower kappa means more lignin removed (lighter colour, easier to bleach) but also means more aggressive cooking, which damages fibre strength. For unbleached packaging paper, a kappa of 50–70 is typical. For paper intended for bleaching, a kappa of 25–35 is targeted. Mill operators control kappa through cooking temperature, time, and chemical charge.¹⁵

Dependencies: - White liquor — regenerated through the chemical recovery loop (Section 3). Requires only makeup chemicals once the loop is running. - Steam — from the recovery boiler and bark boiler. - Digester maintenance — the digester vessel is a steel pressure vessel with wear surfaces (inlet valves, blow lines, screens). Maintenance is achievable with NZ engineering capability (Doc #91) but requires ongoing attention.

2.3 Washing and screening

Process: After cooking, the pulp-liquor mixture is depressurised (“blown”) into a blow tank. The pulp is then washed in a series of countercurrent wash stages — diluted and thickened repeatedly to separate the cellulose fibres from the spent cooking liquor (black liquor). Screens remove knots, uncooked chips, and oversized fibre bundles (shives).¹⁶

The separated black liquor goes to the chemical recovery system (Section 3). The washed pulp proceeds to bleaching or directly to papermaking.

Dependencies: - Wash water — large volumes, recycled within the mill. Kinleith draws from the Waikato River system. - Screens and cleaners — wear components (screens, rotors, orifice plates) require periodic replacement. Fabricable in NZ machine shops from stainless steel or appropriate alloys where available, or from carbon steel with shorter replacement cycles.

2.4 Bleaching (optional but important for printing paper)

Unbleached kraft pulp is brown. This is the natural colour of residual lignin in the fibres. Unbleached paper is entirely functional for printing — letterpress, screen printing, and offset all produce legible results on brown paper, and many books before the 20th century used unbleached or minimally bleached stock. But bleaching improves print contrast, reader comfort, and the professional appearance of documents.

Full bleaching sequence (as practised pre-event):

NZ mills use elemental chlorine-free (ECF) bleaching, typically:¹⁷

1. Oxygen delignification (O stage): Pulp treated with oxygen gas under pressure at 80–100°C with sodium hydroxide. Removes 40–60% of residual lignin without chlorine compounds. Requires: oxygen (from air separation), caustic soda, steam, pressure vessels. The oxygen stage is the most important single bleaching step and the most feasible to maintain from NZ resources.

2. Chlorine dioxide stages (D stages): Chlorine dioxide (ClO₂) removes additional lignin with high selectivity (minimal fibre damage). Requires: chlorine dioxide, which is generated from sodium chlorate and sulfuric acid. Sodium chlorate is produced by electrolysis of sodium chloride (salt). NZ has salt (Lake Grassmere, seawater) and electricity.¹⁸

3. Peroxide stages (P stages): Hydrogen peroxide brightens the pulp further. Hydrogen peroxide production is more complex — anthraquinone process or electrochemical — and may be the hardest bleaching chemical for NZ to produce domestically.¹⁹

Simplified bleaching pathway for NZ recovery conditions:

The realistic approach is staged:

• Phase 2 (immediate): Oxygen delignification only. Produces a pulp that is substantially lighter than unbleached kraft — light to medium brown rather than dark brown. Requires oxygen (producible from air using pressure-swing adsorption, which needs only electricity and zeolite or carbon molecular sieve adsorbent), sodium hydroxide (from the kraft recovery loop plus chlor-alkali production), and steam. This is achievable within 1–2 years.

• Phase 3 (once chlor-alkali production is established): Add a sodium hypochlorite (NaOCl) bleaching stage. Hypochlorite is produced from chlorine and caustic soda, both outputs of the chlor-alkali process. Hypochlorite bleaching is an older technology — it was standard before the environmental concerns about chlorinated organics led to its replacement by chlorine dioxide. Under recovery conditions, where environmental regulations yield to practical necessity, hypochlorite bleaching produces a serviceable cream-to-off-white paper. This is not modern brilliant white, but it provides good print contrast.²⁰

• Long-term (Phase 4+): If sodium chlorate electrolysis is established, chlorine dioxide bleaching becomes feasible, approaching pre-event paper brightness. This is a lower priority — cream paper serves printing needs adequately.

2.5 Pulp refining

Process: Before papermaking, pulp fibres are mechanically refined (beaten) to improve bonding. Refining fibrillates the fibre surfaces — roughening them and exposing cellulose microfibrils that bond to each other during sheet formation. Refining increases paper strength, smoothness, and density but reduces opacity and increases drying energy requirements.²¹

The degree of refining is controlled to balance strength and smoothness (more refining) against opacity, bulk, and drying cost (less refining). For printing paper, moderate refining provides a good balance.

Dependencies: - Disc refiners or conical refiners — existing mill equipment. Refiner plates are hardened steel or stainless steel castings that wear and require periodic replacement. Fabricable in NZ foundries (Doc #93) from appropriate steel, though the quality of locally cast refiner plates may be lower than imported precision-machined plates. Lower quality plates wear faster, requiring more frequent replacement — a manageable trade-off. - Electricity — refiners are significant power consumers (typically 200–1,000 kW per refiner, depending on size and throughput).²² Available under baseline grid conditions.

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3. THE CHEMICAL RECOVERY LOOP

The kraft chemical recovery system is what makes the mill operationally sustainable — it regenerates cooking chemicals and provides the majority of process energy. Understanding it is necessary for anyone planning continued mill operations.

3.1 The cycle

The chemical recovery loop operates as follows:²³

1. Black liquor concentration: Spent cooking liquor (black liquor, approximately 15% solids) is concentrated to approximately 65–75% solids in a series of evaporators. The evaporated water is reused as wash water.

2. Recovery boiler combustion: Concentrated black liquor is sprayed into the recovery boiler and burned. The organic content (dissolved lignin) provides the fuel; combustion temperatures reach 1,000–1,100°C.²⁴ The inorganic content (sodium and sulfur compounds) melts and collects at the base of the furnace as a molten smelt of sodium carbonate (Na₂CO₃) and sodium sulfide (Na₂S).

3. Smelt dissolution: The molten smelt is dissolved in water to form “green liquor” (a solution of Na₂CO₃ and Na₂S).

4. Causticising: Green liquor reacts with slaked lime (Ca(OH)₂) in a causticiser: Na₂CO₃ + Ca(OH)₂ → 2 NaOH + CaCO₃ This converts sodium carbonate to sodium hydroxide, regenerating the white liquor. The calcium carbonate precipitates as “lime mud.”

5. Lime burning: Lime mud (CaCO₃) is burned in a rotary lime kiln at approximately 1,200°C to regenerate quicklime (CaO): CaCO₃ → CaO + CO₂ The quicklime is slaked with water to produce Ca(OH)₂ for the next causticising cycle.

3.2 What makes up losses

The recovery loop is not perfectly closed. Losses occur at several points:

• Sodium losses: Carry-over in flue gases, spillage, washing losses. Makeup is provided as sodium sulfate (Na₂SO₄, called “salt cake”), which is reduced to sodium sulfide in the recovery boiler. Approximately 10–30 kg of sodium sulfate makeup per tonne of pulp produced.²⁵
• Lime losses: Carry-over in flue gases, incomplete calcination, accumulation of non-calcium impurities (called “deadload”). Makeup limestone is required — approximately 20–50 kg per tonne of pulp.²⁶
• Sulfur losses: Emissions as SO₂, H₂S, and organic sulfur compounds. Replaced via sodium sulfate makeup.

3.3 NZ sources for makeup chemicals

Chemical	Required quantity	NZ source	Feasibility
Sodium sulfate (Na₂SO₄)	10–30 kg/tonne pulp	From salt (NaCl) + sulfuric acid (H₂SO₄): 2NaCl + H₂SO₄ → Na₂SO₄ + 2HCl. Salt from Lake Grassmere or seawater. Sulfuric acid from geothermal sulfur (Doc #113).	[B] — requires sulfuric acid production
Limestone (CaCO₃)	20–50 kg/tonne pulp	Oparure quarry (Te Kuiti), McDonald’s Lime (Otorohanga), Golden Bay limestone, numerous smaller deposits throughout NZ.27 NZ has abundant limestone.	[A] — existing NZ capability
Sodium hydroxide (fresh, for bleaching and makeup)	Variable	Chlor-alkali electrolysis: 2NaCl + 2H₂O → 2NaOH + Cl₂ + H₂. Salt + electricity. NZ has both.28	[B] — requires building chlor-alkali cells

The critical dependency is sulfuric acid (Doc #113). Without it, sodium sulfate production from NZ salt is not possible, and the kraft recovery loop gradually loses its sulfur inventory. However, the rate of loss is modest — existing stocks of sodium sulfate at the mill plus the mill’s own sulfur inventory may sustain operations for months to a few years before domestic sulfuric acid production is needed. This timeline needs verification from mill chemical inventories.

3.4 What happens if the recovery boiler fails

The recovery boiler is the single most critical piece of equipment at either mill. If it fails catastrophically:

• The chemical recovery loop stops. Cooking chemicals cannot be regenerated.
• The mill loses 60–80% of its steam and internal electricity generation.²⁹
• Black liquor cannot be processed, which means pulping must stop (black liquor storage is finite, and unprocessed black liquor is a serious waste problem).

Recovery boilers are designed for long life (30–50 years) but are subject to tube corrosion, smelt-water explosions (if tubes leak), and structural fatigue. Maintenance — particularly tube inspection, repair, and replacement — is the priority. NZ has welding and boilermaking capability (Doc #94) sufficient for tube repair. Replacement of the entire recovery boiler is beyond NZ’s foreseeable manufacturing capability.

Contingency: If the recovery boiler at one mill fails, the other mill becomes NZ’s sole kraft pulping facility. This concentration risk argues for maintaining both mills in operational condition, even if only one is producing at full capacity at any given time.

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4. CHEMICAL PRODUCTION FOR PAPERMAKING

4.1 Sodium hydroxide (caustic soda)

Sodium hydroxide is the most important industrial chemical for papermaking — used in kraft cooking, bleaching, and numerous auxiliary processes. NZ currently imports all its caustic soda.³⁰

Domestic production pathway — chlor-alkali electrolysis:

The chlor-alkali process electrolyses brine (saturated NaCl solution) to produce sodium hydroxide, chlorine gas, and hydrogen gas:

2NaCl + 2H₂O → 2NaOH + Cl₂ + H₂

The technology dates to the 1890s and is well-understood. The main challenge is the electrode materials:

• Anode: Must withstand the corrosive chlorine environment. In modern cells, dimensionally stable anodes (DSAs) use titanium coated with ruthenium or iridium oxide. NZ does not produce these coatings. Alternatives: Graphite anodes (producible from petroleum coke or high-quality charcoal — Doc #102) were standard before DSAs. They are consumed during operation (approximately 2–5 kg graphite per tonne of chlorine), require 10–15% more electrical energy per tonne of caustic produced than DSA cells, and produce lower-purity caustic due to graphite degradation products — but they are functional and were the industry standard for decades.³¹
• Cathode: Steel or nickel. Steel is available from NZ Steel (Doc #89). Nickel would need to come from existing stocks or Australian trade.
• Separator: A diaphragm (asbestos or synthetic fabric) or ion-exchange membrane separates the anode and cathode compartments. Membrane cells are more efficient but the membranes are sophisticated manufactured products. Diaphragm cells using available materials (woven fabric or porous ceramic) are simpler to construct.³²

Scale required: If NZ’s paper production consumes 200,000 tonnes of pulp per year (roughly half of Kinleith’s capacity) and the recovery loop operates normally, fresh caustic demand is modest — perhaps 5,000–15,000 tonnes per year for bleaching and makeup losses. A small chlor-alkali installation producing 10–20 tonnes per day of caustic soda would suffice. This requires: concrete cell tanks lined with acid-resistant material, graphite anodes (Doc #102), steel cathodes (Doc #89), a brine purification system (settling tanks, filters), DC rectifiers (from existing industrial electrical stocks or purpose-built — Doc #65), and a chlorine handling system. Construction is estimated at 12–24 months with 10–20 person-years of engineering and construction effort.

Chlorine co-product: Chlor-alkali electrolysis produces chlorine gas alongside caustic soda. Chlorine is useful for bleaching (as hypochlorite), water treatment (Doc #48), and various chemical processes. It is also toxic and requires careful handling infrastructure. The chlorine produced can be immediately reacted with caustic soda to produce sodium hypochlorite (bleach): Cl₂ + 2NaOH → NaOCl + NaCl + H₂O. This avoids the need to store and transport chlorine gas.³³

4.2 Starch (for surface sizing)

Surface sizing is essential for printing paper. Without it, ink soaks into the paper fibres like blotting paper, causing feathering, bleed-through, and poor print definition.

NZ sources:

• Potato starch: NZ grows potatoes across most of the country. Potato starch extraction is a well-understood wet milling process: wash potatoes, grate or shred, wash starch from the pulp by settling in water, dry the settled starch. The process can be performed at small scale with basic equipment, though scaling to hundreds of tonnes per year requires dedicated settling tanks, mechanical grating, and controlled drying to maintain consistent starch quality for paper sizing.³⁴
• Wheat starch: NZ grows wheat commercially, primarily in Canterbury. Wheat starch extraction requires washing the starch from gluten — a slightly more complex process but well-known.
• Maize starch: NZ grows maize in the Waikato and Bay of Plenty regions.

Starch demand for paper sizing is relatively modest — approximately 5–20 kg per tonne of paper, or 50–400 tonnes per year at full production.³⁵ This represents less than 0.1% of NZ’s total potato production even under nuclear winter conditions, so starch supply for papermaking is not a binding constraint.

4.3 Calcium carbonate (filler)

Ground calcium carbonate (GCC) is added to paper as a filler — it improves opacity (reduces show-through), whiteness, and smoothness while reducing the amount of expensive pulp fibre required per sheet. Modern printing papers contain 15–30% calcium carbonate filler by weight.³⁶

NZ has abundant limestone. The Oparure quarry near Te Kuiti and McDonald’s Lime near Otorohanga already produce agricultural and industrial lime. Grinding limestone to paper-filler fineness (median particle size 2–10 micrometres) requires ball milling or other fine grinding equipment — specifically, ball mills with steel or ceramic grinding media, classifiers to separate particles by size, and dust collection systems. NZ has operating ball mills in the cement and mineral processing industries that could be adapted. Achieving the finest particle sizes required for high-quality paper coating (sub-2 micrometre) is more demanding, requiring extended milling times and potentially wet grinding with dispersant chemicals that may not be available domestically.

For recovery-era paper: 10–20% GCC filler loading is a reasonable target. This reduces fibre consumption by a corresponding amount and improves paper opacity, even without achieving the brightness of modern coated papers.

4.4 Alum (retention aid)

Aluminium sulfate (alum) is used in acidic papermaking systems as a retention aid (helps fine particles and fibres bond together during sheet formation) and as a component of rosin sizing systems.

NZ production: Alum is produced by reacting aluminium-bearing minerals (bauxite or kaolin) or metallic aluminium with sulfuric acid. NZ has limited bauxite but has aluminium from the Tiwai Point smelter stockpiles and from scrap recycling. Dissolving aluminium in sulfuric acid produces aluminium sulfate directly.³⁷ Small quantities are needed — approximately 5–15 kg per tonne of paper.

Alternative: Alkaline papermaking systems (using calcium carbonate filler and neutral or alkaline sizing agents) avoid the need for alum. Alkaline papermaking also produces more archivally stable paper (acid-free), which is a significant advantage for documents intended to last decades or centuries. If NZ’s paper production adopts alkaline sizing, alum becomes unnecessary.³⁸

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5. PAPER MACHINE ADAPTATION

5.1 What needs to change

Adapting a Kinleith containerboard machine to produce printing paper involves changes to every section:³⁹

Headbox: Must deliver a thinner, more dilute stock flow at higher speed. Headbox consistency (fibre concentration in the slurry fed to the forming section) is reduced from approximately 0.8–1.2% for containerboard to approximately 0.5–0.8% for lighter paper. Headbox pressure and lip opening are adjusted. These are operational changes, not equipment rebuilds.

Forming section: The wire (forming fabric) speed increases when running lighter paper (lighter sheets require less drainage time). Wire tension and dewatering element positioning may need adjustment. The existing Fourdrinier wire can handle lighter grades, though formation (fibre distribution uniformity) is harder to control at lighter basis weights — this is where operator skill and iterative adjustment matter.

Press section: Lighter sheets are more fragile and more prone to web breaks. Press loading may need to be reduced. Felt selection becomes more critical — the existing containerboard felts may be too coarse for lightweight paper. Felt replacement is a consumable issue; NZ does not manufacture press felts, so existing stocks must be managed carefully. Fabricating felts from NZ wool is theoretically possible but would require significant development work.⁴⁰

Dryer section: Lighter paper dries faster — some dryer cylinders may need to be bypassed or run at reduced steam pressure to avoid over-drying and sheet curl. Steam management adjustments.

Size press: This is the component most likely to need physical modification or addition. If the existing machine lacks a surface size press suitable for starch sizing, one must be installed. A size press consists of two rolls forming a nip through which the paper passes, with a pond of starch solution applied at the nip. The starch penetrates the paper surface, creating a barrier that controls ink absorption. A size press can be fabricated in NZ — the rolls can be ground from steel stock (Doc #91), and the frame and drive are standard engineering.⁴¹

Calender: The containerboard calender may need additional nips (roll pairs) or higher nip pressure to achieve the surface smoothness printing requires. Alternatively, a separate off-machine supercalender (a stack of alternating hard steel and resilient rolls) can be constructed. Supercalendering produces a glossy surface that transfers ink cleanly.

5.2 Timeline and difficulty

The modifications described above are within the capability of NZ’s existing engineering workforce, with the mill’s own process engineers directing the work. They do not require imported equipment or materials beyond what NZ already has or can fabricate.

Estimate: 6–18 months from decision to first acceptable printing paper off the machine. This includes: - 1–3 months: engineering assessment and planning. - 2–6 months: size press fabrication and installation, calender modification, headbox adjustment. - 3–6 months: trial runs, iterative adjustment, quality improvement.

The wide range reflects genuine uncertainty — the actual timeline depends on the mill’s specific equipment, its condition, and the engineering resources available.

5.3 Expected paper quality

Property	Pre-event office paper	NZ-produced (target)	Notes
Basis weight	80 g/m²	60–100 g/m²	Adjustable. Lighter saves fibre; heavier is stronger.
Brightness (ISO)	90–95%	55–75% (O₂ bleached) or 30–40% (unbleached)	Functional for printing at any brightness above ~35%.
Smoothness (Bekk, seconds)	100–200+	30–80	Adequate for letterpress and screen printing.
Surface sizing	Fully sized	Starch sized	Starch available from NZ agriculture.
Opacity	90–95%	80–90% (with GCC filler)	Acceptable. Some show-through on thin grades.
Printer compatibility	Laser printers	Letterpress, screen, offset, stencil	Laser compatibility unlikely — surface too rough, toner adhesion uncertain.
Archival quality	Good (acid-free)	Good if alkaline sizing used	NZ paper can be archival-grade.

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6. SIMPLIFIED PULPING: ALTERNATIVES TO FULL KRAFT

The kraft process requires a recovery boiler and chemical recovery infrastructure that exists only at Kinleith and Kawerau. For situations where these mills are inaccessible — remote regions, transport breakdown, or mill failure — simpler pulping methods can produce usable paper at small scale.

6.1 Soda pulping [Phase 2–3 | Feasibility: B–C]

Soda pulping uses sodium hydroxide alone (no sodium sulfide) as the cooking liquor. It was the first commercial chemical pulping process (developed in the 1850s) and predates the kraft process.⁴²

Advantages: Simpler chemistry — only one chemical (NaOH) needed. No sulfur compounds, so no sulfur odour (a notorious feature of kraft mills). Chemical recovery is simpler — the spent liquor can be burned and the resulting sodium carbonate reconverted to NaOH with lime.

Disadvantages: Slower delignification than kraft. Produces weaker pulp — typically 20–40% lower tear strength and 15–30% lower tensile strength than kraft pulp from the same wood species — because the absence of sodium sulfide means more aggressive conditions are needed, which damages cellulose.⁴³ The resulting paper is adequate for writing and general use but inferior to kraft paper for applications requiring high tear or tensile strength (packaging, sacks, wrapping).

Feasibility for community-scale production: [B–C] Soda pulping is achievable with a steel pressure vessel rated for at least 150°C and 5–7 bar (a repurposed autoclave, steam boiler shell, or purpose-built tank — Doc #91 for fabrication), a heat source capable of sustaining cooking temperature for 2–4 hours, and sodium hydroxide. The spent liquor can be evaporated in open pans and burned in a brick or steel furnace to recover sodium carbonate, which is causticised with lime to regenerate NaOH. This recovery process is substantially less complex than the full kraft recovery boiler — no smelt handling, no high-pressure steam generation — but still requires careful heat management and basic chemical handling competence.

6.2 Lime pulping [Phase 2–3 | Feasibility: B]

A lower-infrastructure variant: cooking wood chips in slaked lime (Ca(OH)₂) solution. Calcium hydroxide is a weaker alkali than sodium hydroxide, so the cook is slower (4–8 hours vs. 2–4 hours for soda pulping) and less complete, but it produces a usable semi-chemical pulp. The advantage: slaked lime is produced by burning limestone (available throughout NZ) in a kiln and adding water. No electrolysis or chemical processing required — the dependency chain is limestone quarrying, lime burning, and a cooking vessel.⁴⁴

Quality: The resulting pulp contains significant residual lignin (kappa 70–100+, compared to 25–35 for bleachable kraft), producing paper that is dark brown, stiff, and rough — comparable in appearance and feel to heavy grocery bags. Tensile and tear strength are 30–50% lower than kraft paper. Usable for packaging, wrapping, and rough printing (screen printing and stencil work on heavily inked designs). Not suitable for fine printing or text documents unless combined with a brightening step.

6.3 Waste paper recycling [Phase 1–3 | Feasibility: A–B]

NZ has substantial stocks of existing paper — offices, libraries, warehouses, and homes contain an estimated several hundred thousand tonnes of paper products (based on pre-event annual imports of 200,000–400,000 tonnes and typical in-country stock turnover of 6–18 months).⁴⁵ Recycling waste paper into new sheets is less equipment-intensive than pulping raw wood, though it still requires energy, water, and chemical inputs.⁴⁶

Process: 1. Soak waste paper in water (warm water speeds the process). Tear or cut into small pieces. 2. Beat the soaked paper into a slurry using a blender, hand beater, or hollander beater. A hollander beater is a trough-mounted rotating drum with bars that shear and fibrillate the fibres — historically the standard papermaking refining tool. Small versions can be fabricated from steel and wood, though the beater bar alignment and clearance require careful adjustment to produce even fibre quality. 3. Screen the slurry through a coarse mesh to remove staples, tape residue, and contaminants. 4. Dilute to appropriate consistency (approximately 0.5–2% fibre) and form sheets (Section 6.4).

Deinking: Printed paper contains ink that, if not removed, produces grey, speckled recycled paper. Deinking typically involves washing the pulp with sodium hydroxide and surfactant (soap — Doc #37), followed by flotation to remove ink particles. The effectiveness depends on the ink type — laser toner is harder to remove than letterpress ink. For NZ recovery purposes, incomplete deinking is acceptable; grey paper with some ink specks is still functional for printing.⁴⁷

Limitations: Paper fibres degrade with each recycling cycle — they become shorter and weaker. Paper can typically be recycled 4–7 times before the fibres are too short for sheet formation. Recycled paper must be supplemented with a proportion of virgin fibre (from wood pulp or other sources) to maintain strength.

6.4 Hand papermaking (community scale) [Phase 2–5 | Feasibility: A]

For small communities with no access to a paper machine, hand papermaking produces usable sheets with minimal equipment:

Equipment: - A mould and deckle — a wooden frame with a stretched wire mesh (the mould) and a removable outer frame (the deckle) that defines the sheet edges. Size: A4 or A3. The mesh can be woven from fine brass or stainless steel wire (from existing stocks) or from fine nylon or polyester fabric.⁴⁸ - A tub large enough to immerse the mould. - Felts — woollen blankets or thick cotton cloth to absorb water from the freshly formed sheet. - A press — any mechanism that applies even pressure (a screw press, or flat boards weighted with stones — the screw press produces more consistent results). - A drying surface or line.

Process: 1. Prepare pulp slurry (from any source — wood, recycled paper, harakeke, other plant fibres) at approximately 1–2% consistency in the tub. 2. Dip the mould and deckle into the slurry, lifting horizontally to collect a layer of fibres on the mesh. 3. Drain for 10–30 seconds, gently shaking side-to-side to improve fibre distribution (formation). 4. Remove the deckle. Invert the mould onto a felt, pressing to transfer the wet sheet (“couching”). 5. Layer felts and sheets alternately, then press in the screw press to remove water. 6. Peel sheets from felts and air-dry on a clean surface or clothesline.

Output: A skilled hand papermaker can produce 100–200 sheets per day — far too slow for volume production but valuable for specialty applications (certificates, official documents, local administrative forms) and for communities that have no other paper source.⁴⁹

Quality: Hand-made paper is uneven by machine standards but has a pleasant character. Thickness and surface smoothness vary within each sheet. Sizing must be applied after forming (dipping the dried sheet in a starch or gelatine solution) to make it suitable for printing or writing.

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7. ALTERNATIVE FIBRE SOURCES

Radiata pine is the primary papermaking fibre for NZ, but several other fibre sources can supplement or partially substitute for wood pulp.

7.1 Harakeke (Phormium tenax)

NZ flax fibre is naturally long (up to 1–2 metres in whole leaf form, shorter when processed) and extremely strong. Harakeke can be pulped using the same alkaline cooking process as wood (soda or kraft) and produces a strong, textured paper.⁵⁰

Advantages: Grows prolifically throughout NZ without cultivation. Fibre is very strong — paper from harakeke has high tear and burst strength. Cultural significance as a taonga species.

Limitations: Fibre extraction from harakeke leaves is more labour-intensive than wood chipping. Yields are lower per hectare than plantation pine. Harakeke paper has a distinctive texture — rougher and more fibrous than wood-pulp paper, which may be desirable for some applications but is not ideal for fine text printing.

Best use: Specialty papers — official documents, currency paper (where strength and distinctive texture are advantages), art and cultural products. Not a bulk commodity replacement for wood pulp. Production should be in partnership with Maori harakeke practitioners (Doc #100).

7.2 Straw and agricultural residues

Wheat straw, barley straw, and other crop residues can be pulped to produce paper. Straw pulping was a significant paper source historically and remains important in China and other countries with limited forest resources.⁵¹

Process: Similar to soda pulping — cook straw in sodium hydroxide solution. Straw pulps more easily than wood due to lower lignin content and thinner cell walls. Shorter cooking times and lower chemical charges are needed.

Quality: Straw pulp produces weaker paper than wood pulp — the fibres are shorter and less resistant to tearing. Blending straw pulp with wood pulp (70% wood, 30% straw is a common ratio) produces acceptable paper that conserves wood while maintaining strength.⁵²

NZ availability: NZ produces wheat and barley straw, primarily in Canterbury and other cropping regions. Under nuclear winter, crop residues are also needed for animal bedding, mulch, and soil amendment (Doc #75), creating competition for the resource. Straw for papermaking is a supplementary source, not a primary one.

7.3 Recycled textiles

Cotton and linen rags were the original papermaking fibre — all European paper before the mid-19th century was made from rags. Cotton fibres produce the strongest, most durable, and highest-quality paper available. Currency paper and fine archival documents are still made from cotton or cotton-linen blends.⁵³

NZ availability: NZ does not grow cotton, but the country has substantial stocks of cotton clothing and textiles that will wear out over the recovery period. Worn-out cotton garments, cotton sheets, and cotton-blend fabrics can be collected, sorted (removing synthetic fibres, buttons, zippers), cut to pieces, and pulped. This is a finite resource — an estimated 2,000–10,000 tonnes of recoverable cotton rag over the first decade, depending on collection efficiency and the proportion of genuine cotton (vs. cotton-polyester blends, which are less suitable) in NZ’s textile stocks.⁵⁴

Best use: High-value papers — currency, constitutional documents, archival copies of critical Recovery Library documents.

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8. NUCLEAR WINTER EFFECTS ON PAPER PRODUCTION

8.1 Forest growth reduction

Nuclear winter modelling predicts reduced forest growth of 40–70% during peak cooling (years 1–5), recovering as conditions normalise.⁵⁵ This does not threaten NZ’s paper production:

• NZ’s standing timber resource is estimated at 450–550 million cubic metres.⁵⁶ Even at zero growth, this represents decades of domestic consumption for all wood uses combined.
• Paper production consumes a small fraction of total wood harvest — perhaps 500,000–1,500,000 cubic metres of pulpwood per year at recovery-era production levels, versus an annual growth increment of 8–18 million cubic metres even under nuclear winter conditions.
• Wood supply for paper is not a constraint in any plausible scenario.

8.2 Agricultural impacts on chemical supply

Starch production (for paper sizing) depends on potato, wheat, or maize crops, all of which will be reduced under nuclear winter. However, the quantities required are small — 50–400 tonnes per year of starch, against NZ’s total potato production alone of approximately 500,000+ tonnes per year.⁵⁷ Even at severely reduced yields, starch supply for papermaking is assured.

8.3 Energy

Both mills depend on grid electricity and internally generated steam. The grid is 85%+ renewable and operational under baseline conditions (Doc #32). Internal steam generation from black liquor and bark is independent of weather. Kawerau’s geothermal steam is entirely unaffected by nuclear winter. Energy is not a constraint for paper production.

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9. CRITICAL UNCERTAINTIES

Uncertainty	Impact if unfavourable	Resolution
Kinleith and Kawerau mill condition post-event	If either mill is damaged or key equipment fails, timeline extends. If both recovery boilers fail, kraft pulping ceases.	Immediate facility assessment. Maintain both mills in operational condition.
Mill workforce retention	If key operators (digester, recovery boiler, paper machine) leave or are unavailable, restart is significantly delayed.	Classify mill workers as essential personnel immediately.
Paper machine adaptability	If existing machines cannot produce acceptable printing paper, more extensive modification or purpose-built equipment is needed.	Mill engineering assessment in Phase 1. Begin trials early.
Chemical inventory at mills	If on-site chemical stocks are lower than assumed, domestic chemical production must be accelerated.	Immediate inventory at both mills.
Chlor-alkali cell construction feasibility	If NZ cannot build functional electrolysis cells, caustic soda and chlorine production are delayed, limiting bleaching.	Engineering assessment. Accept unbleached paper as default.
Press felt availability	Press felts are consumable items not produced in NZ. When existing stocks wear out, fabricating replacements from NZ wool is uncertain.	Immediate felt inventory. Begin development of wool-based felts.
Recovery boiler longevity	If the recovery boiler fails before NZ can build a replacement (which NZ probably cannot), the affected mill loses its chemical recovery capability.	Prioritise recovery boiler maintenance above all other mill equipment.
Sulfuric acid availability	Without sulfuric acid (Doc #113), sodium sulfate for kraft recovery makeup cannot be produced domestically.	Accelerate sulfuric acid production. Establish stockpile management for existing sodium sulfate.
Community-scale paper quality	Small-scale hand or vat papermaking may produce paper too rough or inconsistent for printing.	Trial production. Accept lower quality for local use; reserve mill paper for printing.

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CROSS-REFERENCES

Document	Relationship
Doc #5 — Printing Supply Requisition	Covers existing paper stock management. Doc #5 handles Phase 1 stocks; this document handles Phase 2+ production.
Doc #29 — National Printing Plan	Covers the full printing ecosystem (paper, ink, print shops). This document provides detailed paper production guidance that Doc #29 summarises.
Doc #30 — Print Optimization	Paper-saving techniques that extend both imported and domestically produced paper supplies.
Doc #31 — Manual Printing Methods	The printing technologies that use NZ-produced paper. Paper quality must be matched to printing method.
Doc #48 — Water Treatment	Chlorine from chlor-alkali process is shared between paper bleaching and water treatment.
Doc #65 — Hydro Maintenance	Grid reliability affects mill operation.
Doc #66 — Geothermal Maintenance	Kawerau mill depends on geothermal steam.
Doc #80 — Soil Fertility	Straw and agricultural residues compete between paper fibre and soil amendment.
Doc #89 — NZ Steel Glenbrook	Steel supply for mill maintenance, size press fabrication, and chlor-alkali cell construction.
Doc #91 — Machine Shop Operations	Fabrication of size press rolls, refiner plates, press components, and chlor-alkali cells.
Doc #93 — Foundry Work	Casting of refiner plates and other mill components.
Doc #94 — Welding Consumables	Recovery boiler tube repair and mill fabrication work.
Doc #97 — Cement and Concrete	Lime production for the kraft recovery loop and lime pulping.
Doc #99 — Timber Processing	Shared wood resource — pulpwood allocation from the same plantation forests.
Doc #100 — Harakeke Fiber	Harakeke as a supplementary papermaking fibre.
Doc #102 — Charcoal Production	Carbon electrodes for chlor-alkali cells; shared wood resource.
Doc #103 — Salt Production	Salt for chlor-alkali electrolysis.
Doc #113 — Sulfuric Acid	Sulfuric acid for sodium sulfate production and potentially for bleaching chemicals.
Doc #157 — Trade Training	Training programmes for mill operators, papermakers, and related trades.

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FOOTNOTES

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1. Ministry for Primary Industries (MPI), National Exotic Forest Description (NEFD), annual reporting series. Approximately 1.72 million hectares of planted production forest, with radiata pine comprising approximately 90%. https://www.mpi.govt.nz/forestry/forest-industry-and-work...↩︎

2. NZ pulp and paper sector employment: approximately 1,500–2,000 people across all operations, with Kinleith and Kawerau being the largest individual sites. Source: Stats NZ business demographics; industry reports. The figure of 700–900 for the combined workforce at the two main mills is an estimate. Exact current staffing figures should be verified with Oji Fibre Solutions.↩︎

3. NZ paper and paperboard imports: pre-event NZ imported approximately 200,000–400,000 tonnes per year of paper and paperboard products (printing paper, tissue, packaging grades). This figure is an estimate based on Stats NZ international trade data and trade association reporting; exact figures by grade should be verified. Source: Stats NZ overseas trade data; Pulp and Paper Manufacturers’ Federation of Australasia (PPMA) trade statistics.↩︎

4. Oji Fibre Solutions (formerly Carter Holt Harvey Pulp & Paper) is a subsidiary of Oji Holdings Corporation (Japan). It operates the Kinleith mill (Tokoroa) and the Tasman mill (Kawerau). https://www.ojifs.com/↩︎

5. Kinleith mill capacity approximately 350,000–400,000 air-dried tonnes per year of kraft pulp and containerboard. Exact figures vary by year and product mix. Source: Oji Fibre Solutions production data; NZ Forest Owners Association.↩︎

6. Kraft chemical recovery process: described in standard pulp and paper engineering references. See Smook, G.A. (2002), Handbook for Pulp & Paper Technologists, 3rd edition, Angus Wilde Publications; Biermann, C.J. (1996), Handbook of Pulping and Papermaking, Academic Press. The recovery boiler is the most capital-intensive component of a kraft mill — typically 30–40% of total mill capital cost.↩︎

7. The Kawerau geothermal field provides process steam to the Tasman mill and other industrial users. Geothermal steam is available continuously and does not depend on imported fuel. Source: GNS Science; Bay of Plenty Regional Council geothermal management reports.↩︎

8. Tasman Newsprint at Kawerau ceased operations. NZ newsprint is now entirely imported. Source: Industry reports and media coverage. The exact closure date should be verified.↩︎

9. Paper machine adaptation for lighter grades: converting a containerboard machine to produce printing-grade paper involves operational challenges at every machine section. The description here follows standard papermaking engineering principles. Feasibility assessment for the specific Kinleith machines requires on-site evaluation by mill engineers. See Smook (2002) and Biermann (1996), cited in footnote 5.↩︎

10. Black liquor biological oxygen demand (BOD): concentrated black liquor has a BOD of approximately 30,000–45,000 mg/L, among the highest of any industrial effluent. Uncontrolled discharge to waterways causes severe oxygen depletion. Source: Smook (2002); standard pulp and paper environmental engineering references.↩︎

11. Kraft chemical recovery process: described in standard pulp and paper engineering references. See Smook, G.A. (2002), Handbook for Pulp & Paper Technologists, 3rd edition, Angus Wilde Publications; Biermann, C.J. (1996), Handbook of Pulping and Papermaking, Academic Press. The recovery boiler is the most capital-intensive component of a kraft mill — typically 30–40% of total mill capital cost.↩︎

12. Kraft pulping process description follows standard references: Smook (2002) and Biermann (1996). Chip size specifications, cooking conditions, and washing principles are standard kraft process chemistry.↩︎

13. Kraft pulping process description follows standard references: Smook (2002) and Biermann (1996). Chip size specifications, cooking conditions, and washing principles are standard kraft process chemistry.↩︎

14. Kappa number and yield relationships for radiata pine kraft pulping: radiata pine typically yields 45–52% screened pulp at kappa 25–30 for bleachable-grade pulp, or 55–60% at kappa 50–70 for unbleached grades. Source: APPITA (Australasian Pulp and Paper Industry Technical Association) data; NZ Forest Research Institute (Scion) pulping studies.↩︎

15. Kappa number and yield relationships for radiata pine kraft pulping: radiata pine typically yields 45–52% screened pulp at kappa 25–30 for bleachable-grade pulp, or 55–60% at kappa 50–70 for unbleached grades. Source: APPITA (Australasian Pulp and Paper Industry Technical Association) data; NZ Forest Research Institute (Scion) pulping studies.↩︎

16. Kraft pulping process description follows standard references: Smook (2002) and Biermann (1996). Chip size specifications, cooking conditions, and washing principles are standard kraft process chemistry.↩︎

17. Elemental chlorine-free (ECF) bleaching sequences: the current industry standard, replacing older elemental chlorine bleaching. ECF typically involves oxygen delignification followed by chlorine dioxide and peroxide stages. Source: standard pulp and paper chemistry texts (Smook, Biermann).↩︎

18. NZ imports caustic soda (sodium hydroxide). No chlor-alkali plant was operating in NZ as of the time of writing. Salt is available from Dominion Salt at Lake Grassmere, Marlborough (approximately 50,000 tonnes per year production), plus seawater evaporation. Source: Stats NZ import data; Dominion Salt. https://www.dominionsalt.co.nz/↩︎

19. Hydrogen peroxide production: commercial production typically uses the anthraquinone process (a catalytic hydrogenation and oxidation cycle). Electrochemical production is an alternative that uses only electricity and water but requires specific electrode materials. Both pathways are more complex than chlor-alkali electrolysis. Source: Kirk-Othmer Encyclopedia of Chemical Technology.↩︎

20. Sodium hypochlorite bleaching: an older bleaching technology largely replaced by chlorine dioxide bleaching due to environmental concerns (chlorinated organic compounds in effluent). Under recovery conditions, the environmental trade-off is acceptable. Hypochlorite produces a less bright pulp than chlorine dioxide but significantly lighter than unbleached kraft. Source: Smook (2002).↩︎

21. Kraft pulping process description follows standard references: Smook (2002) and Biermann (1996). Chip size specifications, cooking conditions, and washing principles are standard kraft process chemistry.↩︎

22. Disc refiner power consumption: typical range 200–1,000 kW per refiner depending on disc diameter (typically 900–1,500 mm for mill-scale units), throughput, and degree of refining. Higher specific energy refining (more kWh per tonne) produces finer, better-bonded paper but at higher energy cost. Source: Smook (2002); Biermann (1996).↩︎

23. Kraft chemical recovery process: described in standard pulp and paper engineering references. See Smook, G.A. (2002), Handbook for Pulp & Paper Technologists, 3rd edition, Angus Wilde Publications; Biermann, C.J. (1996), Handbook of Pulping and Papermaking, Academic Press. The recovery boiler is the most capital-intensive component of a kraft mill — typically 30–40% of total mill capital cost.↩︎

24. Kraft chemical recovery process: described in standard pulp and paper engineering references. See Smook, G.A. (2002), Handbook for Pulp & Paper Technologists, 3rd edition, Angus Wilde Publications; Biermann, C.J. (1996), Handbook of Pulping and Papermaking, Academic Press. The recovery boiler is the most capital-intensive component of a kraft mill — typically 30–40% of total mill capital cost.↩︎

25. Kraft recovery loop chemical losses and makeup requirements: typical values from standard references. Actual losses depend on mill design, equipment condition, and operating practice. Smook (2002) gives typical sodium sulfate makeup of 10–30 kg per tonne of pulp; lime makeup of 20–50 kg per tonne.↩︎

26. Kraft recovery loop chemical losses and makeup requirements: typical values from standard references. Actual losses depend on mill design, equipment condition, and operating practice. Smook (2002) gives typical sodium sulfate makeup of 10–30 kg per tonne of pulp; lime makeup of 20–50 kg per tonne.↩︎

27. NZ limestone deposits: Oparure quarry (Te Kuiti), McDonald’s Lime (Otorohanga), Golden Bay limestone, and numerous other deposits. NZ has abundant limestone resources for both industrial lime production and cement manufacture (Doc #112). Source: GNS Science mineral database; NZ geological survey data.↩︎

28. NZ imports caustic soda (sodium hydroxide). No chlor-alkali plant was operating in NZ as of the time of writing. Salt is available from Dominion Salt at Lake Grassmere, Marlborough (approximately 50,000 tonnes per year production), plus seawater evaporation. Source: Stats NZ import data; Dominion Salt. https://www.dominionsalt.co.nz/↩︎

29. Recovery boiler energy contribution: in a well-integrated kraft mill, the recovery boiler provides 60–80% of total mill steam demand and generates significant electricity through back-pressure turbines. Source: Smook (2002); general kraft mill energy balance data.↩︎

30. NZ imports caustic soda (sodium hydroxide). No chlor-alkali plant was operating in NZ as of the time of writing. Salt is available from Dominion Salt at Lake Grassmere, Marlborough (approximately 50,000 tonnes per year production), plus seawater evaporation. Source: Stats NZ import data; Dominion Salt. https://www.dominionsalt.co.nz/↩︎

31. Chlor-alkali cell design: historical and modern cell types described in standard electrochemistry references. Graphite anodes were standard before dimensionally stable anodes (DSAs) became available in the 1960s. Graphite anodes are consumed at approximately 2–5 kg per tonne of chlorine produced but are fabricable from NZ materials. Diaphragm cells using asbestos, woven fabric, or porous ceramic separators are simpler than membrane cells. Source: Kirk-Othmer Encyclopedia of Chemical Technology; Hine, F. (1985), Electrode Processes and Electrochemical Engineering, Plenum Press.↩︎

32. Chlor-alkali cell design: historical and modern cell types described in standard electrochemistry references. Graphite anodes were standard before dimensionally stable anodes (DSAs) became available in the 1960s. Graphite anodes are consumed at approximately 2–5 kg per tonne of chlorine produced but are fabricable from NZ materials. Diaphragm cells using asbestos, woven fabric, or porous ceramic separators are simpler than membrane cells. Source: Kirk-Othmer Encyclopedia of Chemical Technology; Hine, F. (1985), Electrode Processes and Electrochemical Engineering, Plenum Press.↩︎

33. Sodium hypochlorite bleaching: an older bleaching technology largely replaced by chlorine dioxide bleaching due to environmental concerns (chlorinated organic compounds in effluent). Under recovery conditions, the environmental trade-off is acceptable. Hypochlorite produces a less bright pulp than chlorine dioxide but significantly lighter than unbleached kraft. Source: Smook (2002).↩︎

34. Potato starch extraction: a well-established wet milling process described in standard food processing references. The process requires washing, mechanical grating, starch-water separation by settling or centrifuge, and drying. NZ potato production capacity is substantial — approximately 500,000+ tonnes per year under normal conditions. Source: Plant & Food Research NZ; Potatoes NZ.↩︎

35. Paper surface sizing starch consumption: approximately 5–20 kg of starch per tonne of paper, depending on the level of sizing required and the application method. Source: Standard papermaking references (Smook, Biermann).↩︎

36. Calcium carbonate filler in printing papers: modern woodfree printing papers typically contain 15–30% calcium carbonate (ground or precipitated) as filler. Filler improves opacity, brightness, smoothness, and printability while reducing fibre cost. Source: Standard papermaking references.↩︎

37. Aluminium sulfate (alum) production: dissolving aluminium metal in sulfuric acid is the most accessible route for NZ. 2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂↑. The reaction is exothermic and produces hydrogen gas, requiring ventilation and careful acid addition to control reaction rate. Aluminium from Tiwai Point stockpiles or scrap recycling provides the feedstock; sulfuric acid from Doc #113. Source: Standard industrial chemistry references (Kirk-Othmer).↩︎

38. Alkaline papermaking: developed commercially from the 1980s onward, replacing acidic (alum-rosin) sizing systems. Alkaline sizing uses calcium carbonate filler (which dissolves in acidic systems) and synthetic sizing agents (alkyl ketene dimer or alkenyl succinic anhydride). Synthetic sizing agents are imported and finite, but starch-based sizing combined with calcium carbonate filler provides a functional alkaline system from NZ materials, with somewhat lower water resistance than synthetic sizing. Source: Smook (2002); TAPPI technical publications.↩︎

39. Paper machine adaptation for lighter grades: converting a containerboard machine to produce printing-grade paper involves operational challenges at every machine section. The description here follows standard papermaking engineering principles. Feasibility assessment for the specific Kinleith machines requires on-site evaluation by mill engineers. See Smook (2002) and Biermann (1996), cited in footnote 5.↩︎

40. Paper machine press felts: manufactured from synthetic fibres (nylon, polyester) in modern mills. NZ does not produce press felts. Fabricating felts from NZ wool is conceptually feasible — wool felts were used historically — but modern press felts are engineered products with specific permeability, compressibility, and wear characteristics that wool may not match without significant development. This is an important uncertainty. Source: General papermaking equipment references.↩︎

41. Size press fabrication: a size press consists of two precision-ground rolls in a frame with a starch application system. The rolls must be round, smooth, and resistant to corrosion. Steel rolls chrome-plated or hard-surfaced would be ideal; plain steel rolls are acceptable with shorter service life. Fabrication in NZ machine shops (Doc #91) is feasible. Source: Standard paper machine engineering references.↩︎

42. Soda pulping: the first commercial chemical pulping process, patented by Burgess and Watts in 1854. Uses sodium hydroxide alone. Produces weaker pulp than kraft due to the absence of sodium sulfide (which accelerates delignification and protects cellulose). Still used commercially in some contexts, particularly for non-wood fibres. Source: Smook (2002); Biermann (1996).↩︎

43. Soda pulping: the first commercial chemical pulping process, patented by Burgess and Watts in 1854. Uses sodium hydroxide alone. Produces weaker pulp than kraft due to the absence of sodium sulfide (which accelerates delignification and protects cellulose). Still used commercially in some contexts, particularly for non-wood fibres. Source: Smook (2002); Biermann (1996).↩︎

44. Lime pulping: an even simpler variant using calcium hydroxide. Weaker alkali, slower delignification, higher residual lignin. Produces semi-chemical pulp suitable for corrugating medium and rough paper grades. The advantage is minimal chemical infrastructure — only limestone and a kiln are needed. Source: General pulping references.↩︎

45. NZ paper and paperboard imports: pre-event NZ imported approximately 200,000–400,000 tonnes per year of paper and paperboard products (printing paper, tissue, packaging grades). This figure is an estimate based on Stats NZ international trade data and trade association reporting; exact figures by grade should be verified. Source: Stats NZ overseas trade data; Pulp and Paper Manufacturers’ Federation of Australasia (PPMA) trade statistics.↩︎

46. Paper recycling processes: standard waste paper recycling involves repulping, screening, cleaning, and optionally deinking. Fibre quality degrades with each cycle — fibres become shorter and weaker. The “4–7 cycles” figure is commonly cited in recycling literature. Source: McKinney, R.W.J. (1995), Technology of Paper Recycling, Blackie Academic; TAPPI recycling publications.↩︎

47. Paper recycling processes: standard waste paper recycling involves repulping, screening, cleaning, and optionally deinking. Fibre quality degrades with each cycle — fibres become shorter and weaker. The “4–7 cycles” figure is commonly cited in recycling literature. Source: McKinney, R.W.J. (1995), Technology of Paper Recycling, Blackie Academic; TAPPI recycling publications.↩︎

48. Hand papermaking: described in numerous historical and craft references. The mould and deckle method dates to the invention of paper in China (circa 2nd century CE) and has been used continuously since. A skilled hand papermaker can produce 100–200 sheets per day of A4-equivalent size. Source: Hunter, D. (1947), Papermaking: The History and Technique of an Ancient Craft, Alfred Knopf (the definitive reference on hand papermaking history and technique).↩︎

49. Hand papermaking: described in numerous historical and craft references. The mould and deckle method dates to the invention of paper in China (circa 2nd century CE) and has been used continuously since. A skilled hand papermaker can produce 100–200 sheets per day of A4-equivalent size. Source: Hunter, D. (1947), Papermaking: The History and Technique of an Ancient Craft, Alfred Knopf (the definitive reference on hand papermaking history and technique).↩︎

50. Harakeke as a papermaking fibre: experimental production of paper from harakeke fibre has been conducted in NZ. The resulting paper is strong and textured, reflecting the fibre’s naturally long staple length and high tensile strength. Formal characterisation of harakeke paper properties is limited. Source: NZ papermaking and fibre arts community knowledge; limited published studies.↩︎

51. Straw pulping: a significant paper fibre source historically and currently in regions with limited forest resources, particularly China and India. Straw has lower lignin content than wood (approximately 15–20% vs. 25–30%) and shorter fibres. Blending straw pulp with wood pulp at ratios up to 30% straw produces acceptable paper. Source: Hurter, R.W. (2001), “Nonwood plant fiber characteristics,” in TAPPI 2001 Pulping Conference Proceedings.↩︎

52. Straw pulping: a significant paper fibre source historically and currently in regions with limited forest resources, particularly China and India. Straw has lower lignin content than wood (approximately 15–20% vs. 25–30%) and shorter fibres. Blending straw pulp with wood pulp at ratios up to 30% straw produces acceptable paper. Source: Hurter, R.W. (2001), “Nonwood plant fiber characteristics,” in TAPPI 2001 Pulping Conference Proceedings.↩︎

53. Cotton rag as papermaking fibre: all European paper was made from cotton and linen rags from the invention of European papermaking (circa 12th century) until wood pulp became dominant in the mid-19th century. Cotton fibre produces extremely strong, durable, and high-quality paper — the standard for currency, fine art, and archival documents. Source: Hunter (1947), cited in footnote 29.↩︎

54. NZ cotton textile stock estimate: NZ imports approximately 30,000–50,000 tonnes per year of clothing and household textiles (Stats NZ trade data). Of this, an estimated 30–50% by weight is cotton or cotton-dominant blends. Accumulated stock in households and commercial premises, less wastage and non-recoverable items, gives an estimated 2,000–10,000 tonnes of usable cotton rag available for collection over the first decade. This is a rough estimate; actual yields depend on collection logistics and sorting labour.↩︎

55. Nuclear winter forest growth reduction: estimated at 40–70% during peak cooling based on temperature-growth and light-response relationships. See Doc #153, Section 8 and references therein. Robock, A. et al. (2007), “Nuclear winter revisited with a modern climate model,” Journal of Geophysical Research; Toon, O.B. et al. (2019), “Rapidly expanding nuclear arsenals,” Science Advances.↩︎

56. NZ standing timber volume: MPI National Exotic Forest Description (NEFD) estimates total standing volume of plantation forests at approximately 450–550 million cubic metres, depending on year and measurement methodology. Source: MPI NEFD annual reports; NZ Forest Owners Association.↩︎

57. NZ potato production: approximately 500,000+ tonnes per year under normal conditions. Source: Plant & Food Research NZ; Stats NZ agricultural production data. Nuclear winter conditions would reduce yields significantly (estimated 30–60%), but the quantity required for paper sizing (50–400 tonnes of starch) represents less than 0.1% of total potato production even at reduced levels.↩︎