SOLUTION
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Key Equipment Configurations for Modern Kraft Liner Producti...
Core Equipment Configuration for Kraft Liner ProductionKraft linerboard production requires robust stock preparation equipment capable of handling high-consistency pulp with minimal fiber damage. A well-designed production line integrates pulping, screening, refining, and sheet formation into a cohesive system that delivers consistent board quality at optimal energy consumption levels.Hydraulic Pulping SystemThe hydraulic pulper serves as the first critical stage, breaking down virgin pulp bales or recycled fiber into a workable slurry. For kraft liner applications, pulpers with capacities of 200–600 TPD at 4–6% consistency are standard. Leizhan hydraulic pulpers feature optimized rotor design achieving complete defibering within 15–20 minutes per batch, with installed power ranging from 132 kW to 500 kW depending on production scale.High-Consistency ScreeningPressure screens with slot dimensions of 0.15–0.35 mm remove contaminants while preserving long fiber fractions essential for linerboard strength. The screen basket design maintains reject rates below 15% while achieving fiber recovery rates exceeding 95%. Multi-stage screening configurations (primary, secondary, tertiary) maximize yield from the accepts stream.Refining for Strength DevelopmentDouble disc refiners with disc diameters of 660–1100 mm and motor power of 250–900 kW provide controlled fibrillation of kraft fibers. Precise plate gap adjustment (0.1–0.5 mm range) optimizes freeness reduction while minimizing fiber cutting. Typical specific...
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Corrugated Paper Making Line: High-Strength Medium and Testl...
Corrugated Paper Making Line: High-Strength Medium and Testliner ProductionCorrugated medium and testliner are the structural components of corrugated boxes, accounting for over 70% of global packaging paper production. A modern corrugated paper making line processes recycled fiber (OCC — old corrugated containers) through robust stock preparation, high-consistency forming, and efficient drying to produce fluting medium (90–150 gsm) and testliner (110–200 gsm) at 300–800 TPD.The distinguishing feature of corrugated paper production is its tolerance for lower-quality fiber sources. The stock preparation system must handle high contaminant loads including staples, plastics, hot melts, and wet-strength additives commonly found in post-consumer OCC. Equipment selection emphasizes ruggedness, ease of maintenance, and contamination removal efficiency over fine fiber development.Stock Preparation for OCC RecyclingDrum Pulper: Capacity 400–800 TPD, operating consistency 15–18% for gentle defibering with minimal contaminant breakdown. Continuous operation with 15–25 minute retention time for complete fiberization. Motor power 400–900 kW.High-Density Cleaner: 4–6 inch diameter, feed consistency 3–4%, pressure drop 140–180 kPa. Removes heavy contaminants (stones, metal, glass) with 95%+ efficiency. Multi-stage cascade configuration minimizes fiber loss.Coarse Pressure Screen: Basket with 2.0–3.0 mm holes, consistency 3–4%, reject rate 15–25%. Primary function is removing coarse plastics and undisintegrated fiber bundles.Fine Pressure Screen: Basket with 0.25–0.35 mm...
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Coating Board Paper Making Line: Multi-Layer Forming for Pre...
Coating Board Paper Making Line: Multi-Layer Forming for Premium PackagingCoating board — including duplex board, triplex board, and white back folding boxboard — is the preferred material for premium packaging in the food, pharmaceutical, and consumer goods industries. A modern coating board production line combines multi-ply forming technology with advanced coating stations to produce board with basis weights of 200–450 gsm, exceptional smoothness, and superior printability.The production process starts with separate stock preparation lines for each ply: a bleached chemical pulp top layer for whiteness and printability, a mechanical or recycled fiber middle layer for bulk stiffness, and a waste paper-based back layer for cost efficiency. Each layer is formed on individual fourdriniers before combining in the wet state, followed by pre-drying, surface sizing, coating application, and final calendering.Multi-Ply Forming EquipmentTop Layer Stock Preparation: Hydrapulper 100–200 TPD, followed by high-density cleaner, pressure screen (0.15 mm slots), and disc refiner (250 kW). Fiber blend typically 70% bleached hardwood kraft + 30% bleached softwood kraft for optimal formation and strength.Middle/Filler Layer System: Hydrapulper 200–400 TPD processing mixed waste or mechanical pulp, medium-consistency cleaner, pressure screen (0.25 mm slots), and disc refiner (355–500 kW). This layer provides 50–60% of total board caliper.Back Layer...
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Cultural Paper Production Line: From Pulp Preparation to Fin...
Cultural Paper Production Line: From Pulp Preparation to Finished SheetsCultural paper — encompassing printing, writing, and office papers — demands exceptional formation quality, high brightness, and precise caliper control. A modern cultural paper production line processes chemical pulp (bleached kraft or sulfite) through advanced stock preparation and high-speed paper machines to produce grades from 45–120 gsm at speeds up to 1200 m/min.The production sequence includes pulp refining for fiber development, multi-stage cleaning for contaminant removal, precision screening for shive elimination, and a gap former or hybrid former paper machine with extended nip press technology. Surface sizing and soft calendering provide the final printability and smoothness characteristics required for high-quality offset and digital printing applications.Core Equipment SpecificationsHydrapulper (Low Consistency): Capacity 150–400 TPD at 3–4.5% consistency, Vokes rotor design for gentle defibering that preserves fiber length. Motor power 90–315 kW depending on capacity.High Consistency Cleaner System: 4-stage cascade configuration, feed consistency 0.8–1.2%, rejects below 8% of feed. Removes sand, metal particles, and high-density contaminants with efficiency above 98%.Pressure Screen (Fine Slotted): Basket with 0.10–0.20 mm slots, maximum consistency 2.5%. Designed for final-stage screening before the paper machine headbox to eliminate all visible dirt specks.Disc Refiner (Post-Refining): Disc diameter 660 mm, motor 160–355...
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Kraft Liner Paper Making Line: Complete Pulping to Paper Mac...
Kraft Liner Paper Making Line OverviewKraft linerboard is the primary packaging material for corrugated containers, requiring high burst strength, excellent ring crush resistance, and consistent surface quality. A well-engineered kraft liner production line integrates pulping, screening, refining, and paper machine sections to achieve production capacities ranging from 200 to 800 TPD with basis weights of 100–300 gsm.The complete kraft liner making line begins with waste paper or virgin pulp processing and extends through the wet end, press section, drying, and finishing. Key equipment includes hydraulic pulpers for efficient defibering, pressure screens for contaminant removal, double disc refiners for fiber development, and fourdrinier or gap former paper machines optimized for heavy-weight liner grades.Key Equipment SpecificationsHydraulic Pulper: Capacity 200–600 TPD, operating consistency 4–6%, motor power 132–500 kW. Designed for continuous operation with rotor extraction plate for tramp material removal.Pressure Screen (Primary): Screen basket with 0.20–0.35 mm slots, maximum feed consistency 3.5%, reject rate below 15%. Fiber recovery exceeds 95% with minimal fiber loss.Double Disc Refiner: Disc diameter options 660/910/1100 mm, motor 250–900 kW, refining consistency 3.5–5%. Energy savings of 15–20% compared to conventional conical refiners.Fourdrinier Paper Machine: Wire width 3200–5600 mm, design speed 300–600 m/min, basis weight range 100–300 gsm, daily output...
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Corrugated Paper Making Line: High-Performance Production fo...
Corrugated Medium and Testliner ProductionCorrugated paper, including corrugating medium and testliner grades, forms the structural core of corrugated board packaging. Production volumes for these grades are among the highest in the paper industry, with single machines producing 300-800 TPD. The stock preparation line must handle high volumes of recycled fiber, primarily OCC (Old Corrugated Containers), while maintaining consistent quality for high-speed corrugator operation. Basis weights typically range from 90-180 gsm for medium and 115-200 gsm for testliner.High-Capacity Pulping for OCC ProcessingThe pulping stage uses large-capacity Hydraulic Pulpers rated at 400-800 TPD for single-line operations. Operating consistency of 3.5-5% with rotor power of 250-500 kW ensures rapid defibering of OCC bales. The pulper includes efficient junk removal through raggers, junkers, and a debris extraction well. Pulping energy consumption for OCC is relatively low at 18-25 kWh per ton due to the already-processed nature of the fiber, though starch and adhesive residues from previous converting operations require additional cleaning stages.Robust Screening and Cleaning SystemsPressure Screens with 0.20-0.35mm slot baskets form the primary screening stage, handling the high contamination load typical of post-consumer OCC. A two-stage screening cascade with secondary and tertiary stages recovers usable fiber from the primary screen rejects. The reject...