Machinery for making pulp of fibrous cellulosic material
Machinery for making pulp of fibrous cellulosic material or for making or finishing paper or paperboard (other than the machinery of heading 8419); parts thereof: > Machinery for making pulp of fibrous cellulosic material
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.05, 9903.88.06, 9903.88.07, 9903.88.08, 9903.88.10, 9903.88.11, 9903.88.14, 9903.88.19, 9903.88.50, 9903.88.52, 9903.88.58, 9903.88.60, 9903.88.62, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(a) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(b) [to this subchapter]
Products classified under HTS 8439.10.00
Kraft Pulping Digester
A large pressure vessel used in the kraft process to cook wood chips with chemicals to separate lignin and produce pulp from fibrous cellulosic material. It operates under high temperature and pressure to break down the wood structure. Classified under HTS 8439.10.00 as machinery specifically for making pulp from cellulosic fibers.
Continuous Wood Chip Digester
An automated digester that continuously feeds wood chips through cooking zones for efficient pulp production from cellulosic fibers. It features stratified impregnation and cooking stages for optimal lignin removal. Falls under HTS 8439.10.00 for specialized pulp-making equipment.
Batch Pulp Digester
A cylindrical vessel loaded in batches with wood chips and cooking liquor to produce chemical pulp through intermittent cycles. Commonly used in smaller mills for flexible production. HTS 8439.10.00 covers this core pulp-making machinery from fibrous cellulosic material.
Sulfite Pulp Cooker
Machinery using calcium or magnesium bisulfite solutions to cook wood chips for sulfite pulp production, yielding high-brightness pulp for specialty papers. It maintains acidic cooking conditions for fiber separation. Classified in HTS 8439.10.00 as pulp-making equipment.
Defibrator for Mechanical Pulp
High-speed rotor machinery that mechanically separates wood fibers through grinding and refining to produce mechanical pulp without chemicals. Used for newsprint production from cellulosic material. HTS 8439.10.00 includes mechanical pulping equipment.
Wood Chip Impregnator
Equipment that pre-treats wood chips by impregnating them with cooking liquor before digestion, improving pulp yield from fibrous cellulosic material. Features downflow or upflow liquor penetration systems. Falls under HTS 8439.10.00 for pulp preparation machinery.
Pulp Washing Drum
Rotating vacuum drum that separates cooking liquor from pulp fibers post-digestion, recovering chemicals and cleaning cellulosic pulp. Twin-roll design for multi-stage washing. Classified under HTS 8439.10.00 as integral pulp-making machinery.
Atmospheric Diffuser Washer
Diffuser system operating at atmospheric pressure to displace black liquor from brownstock pulp using countercurrent washing. Improves pulp cleanliness for cellulosic fiber processing. HTS 8439.10.00 covers this pulp purification machinery.
Chip Presteaming Bin
Vessel that heats wood chips with low-pressure steam to soften fibers and remove air before pulping, enhancing impregnation efficiency. Essential first step in chemical pulp production from cellulosic material. Under HTS 8439.10.00 for pulp-making machinery.
Mechanical Pulp Refiner
Double-disc refiner that develops fiber properties through controlled mechanical action on groundwood pulp from cellulosic material. Adjustable plate patterns control freeness and strength. Classified in HTS 8439.10.00 for pulp-making equipment.
Knotter Screen for Pulp
Pressure screen that removes uncooked fiber knots and shives from cooked pulp slurry, ensuring pulp quality from cellulosic digestion. Features rotating foils for self-cleaning. HTS 8439.10.00 includes pulp cleaning machinery.
Brown Stock Pump for Pulp Lines
Heavy-duty centrifugal pump designed for 10-15% consistency brownstock pulp slurry transfer post-digestion. Open impeller prevents fiber clogging in cellulosic pulp processes. Falls under HTS 8439.10.00 as pulp handling machinery.
Chip Metering Feeder
Precision screw feeder that accurately meters wood chip flow into digesters, controlling inventory and digester filling for consistent pulp production from cellulosic material. Variable speed drive for process control. HTS 8439.10.00 pulp preparation equipment.
Pulp Press Feeder
Screw press feeder that dewaters pulp from 1% to 30-40% consistency before twin-roll pressing, recovering liquor in cellulosic pulp lines. Progressive cavity design handles varying consistencies. Under HTS 8439.10.00 for pulp dewatering machinery.
Digesting Tower Agitator
Heavy-duty propeller agitator installed in continuous digesters to ensure uniform circulation of cooking liquor through wood chip column during pulp production. Variable speed for delignification control. Classified HTS 8439.10.00 as pulp cooking accessory.