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.
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More Specific Codes
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If for industrial water intake screens
General filtering in 8421; pulp knotters specific to fiber cleaning.
If for paper finishing auxiliary equipment
8439.10 for pulp-making purification steps.
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Import Tips & Compliance
• Detail screen basket slot width (0.10-0.20mm) and reject rate specifications
• Include foil speed and pressure drop data across screen
• Specify construction materials (tungsten carbide for wear resistance)
Related Products 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.