Chapter 8439 — Customs Tariff Headings

8439.20.00Machinery for making paper or paperboard

8439.30.00Machinery for finishing paper or paperboard

8439.9Parts:

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Products classified under Tariff item 84.39

Atmospheric Diffuser Washer

An atmospheric diffuser washer is a key component in the pulp production process, operating at atmospheric pressure to displace black liquor from brownstock pulp using countercurrent washing. This machinery improves pulp cleanliness and is integral to processing fibrous cellulosic material, falling directly under tariff item 8439.10.00 for machinery for making pulp.

Batch Pulp Digester

A batch pulp digester is 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. This machinery is essential for making pulp of fibrous cellulosic material, fitting the scope of tariff item 8439.10.00.

Brown Stock Pump for Pulp Lines

A brown stock pump for pulp lines is a heavy-duty centrifugal pump designed for transferring brownstock pulp slurry at 10-15% consistency post-digestion, with an open impeller to prevent fiber clogging. This pump is used in cellulosic pulp processes and is classified under tariff item 8439.10.00 as machinery for making pulp of fibrous cellulosic material.

Chip Metering Feeder

A chip metering feeder is a precision screw feeder that accurately meters wood chip flow into digesters, controlling inventory and digester filling for consistent pulp production from cellulosic material. This machinery is essential for the pulping process and falls under tariff item 8439.10.00 for machinery for making pulp of fibrous cellulosic material.

Chip Presteaming Bin

A chip presteaming bin is a vessel that heats wood chips with low-pressure steam to soften fibers and remove air before pulping, enhancing impregnation efficiency. This equipment is an essential first step in chemical pulp production from cellulosic material, fitting tariff item 8439.10.00 for machinery for making pulp.

Continuous Wood Chip Digester

A continuous wood chip digester is an automated digester that continuously feeds wood chips through cooking zones for efficient pulp production from cellulosic fibers, featuring stratified impregnation and cooking stages for optimal lignin removal. This machinery is central to making pulp of fibrous cellulosic material, falling under tariff item 8439.10.00.

Defibrator for Mechanical Pulp

A defibrator for mechanical pulp is 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. This machinery is used for making pulp of fibrous cellulosic material, fitting tariff item 8439.10.00.

Digesting Tower Agitator

A digesting tower agitator is a heavy-duty propeller agitator installed in continuous digesters to ensure uniform circulation of cooking liquor through the wood chip column during pulp production, with variable speed for delignification control. This machinery is integral to making pulp of fibrous cellulosic material, falling under tariff item 8439.10.00.

Knotter Screen for Pulp

A knotter screen for pulp is a pressure screen that removes uncooked fiber knots and shives from cooked pulp slurry, ensuring pulp quality from cellulosic digestion, with rotating foils for self-cleaning. This machinery is used in the pulp-making process and falls under tariff item 8439.10.00 for machinery for making pulp of fibrous cellulosic material.

Kraft Pulping Digester

A kraft pulping digester is 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, operating under high temperature and pressure. This machinery is essential for making pulp of fibrous cellulosic material, fitting tariff item 8439.10.00.

Mechanical Pulp Refiner

A mechanical pulp refiner is a double-disc refiner that develops fiber properties through controlled mechanical action on groundwood pulp from cellulosic material, with adjustable plate patterns to control freeness and strength. This machinery is used for making pulp of fibrous cellulosic material, falling under tariff item 8439.10.00.

New CMP Wafer Polisher

A chemical mechanical planarization (CMP) polisher used for final surface finishing of semiconductor wafers, removing material uniformly to achieve nanometer-level flatness. This machine is classified under tariff item 8439.10.00 as machinery for making pulp of fibrous cellulosic material, given its role in preparing semiconductor substrates.

New Crystal Annealing Furnace

An annealing furnace designed for stress relief in semiconductor boules after crystal growth. This equipment is classified under tariff item 8439.10.00 as machinery for making pulp of fibrous cellulosic material, reflecting its use in preparing semiconductor materials.

New Crystal Boule Grinder

A precision grinder used for shaping semiconductor crystal boules to exact diameters and grinding flats that indicate conductivity type and resistivity before wafer slicing. This machine is classified under tariff item 8439.10.00 as machinery for making pulp of fibrous cellulosic material.

New Czochralski Crystal Puller

A Czochralski crystal puller used to grow extremely pure monocrystalline silicon boules from molten semiconductor material, from which wafers are sliced for semiconductor fabrication. This machine is classified under tariff item 8439.10.00 as machinery for making pulp of fibrous cellulosic material.

New Float Zone Crystal Furnace

A float zone furnace that uses the float zone method to produce high-purity monocrystalline semiconductor boules without crucibles, ideal for silicon and gallium arsenide. This equipment is classified under tariff item 8439.10.00 as machinery for making pulp of fibrous cellulosic material.

New Gallium Arsenide Crystal Grower

A specialized grower for compound semiconductor GaAs boules using the Liquid Encapsulated Czochralski (LEC) method. This machine is classified under tariff item 8439.10.00 as machinery for making pulp of fibrous cellulosic material, given its role in processing semiconductor materials.

New Semiconductor Wafer Slicing Saw

A high-precision inner-diameter saw for slicing ultra-thin wafers from monocrystalline semiconductor boules with minimal kerf loss and damage. This machine is classified under tariff item 8439.10.00 as machinery for making pulp of fibrous cellulosic material.

New Silicon Ingot Puller

An automated puller system for growing large-diameter silicon ingots using the Czochralski process for semiconductor wafer production. This machine is classified under tariff item 8439.10.00 as machinery for making pulp of fibrous cellulosic material.

New Wafer Edge Grinder

An edge profiling grinder used to chamfer and round semiconductor wafer edges, preventing chipping during handling and processing. This machine is classified under tariff item 8439.10.00 as machinery for making pulp of fibrous cellulosic material.

New Wafer Lapping Machine

An automated lapping machine that uses abrasive slurries to flatten and thin semiconductor wafers to precise tolerances before polishing. This equipment is classified under tariff item 8439.10.00 as machinery for making pulp of fibrous cellulosic material.

Pulp Press Feeder

A pulp press feeder is a screw press feeder that dewaters pulp from 1% to 30-40% consistency before twin-roll pressing, recovering liquor in cellulosic pulp lines, with a progressive cavity design handling varying consistencies. This machinery is used in the pulp-making process and falls under tariff item 8439.10.00 for machinery for making pulp of fibrous cellulosic material.

Pulp Washing Drum

A pulp washing drum is a rotating vacuum drum that separates cooking liquor from pulp fibers post-digestion, recovering chemicals and cleaning cellulosic pulp, with a twin-roll design for multi-stage washing. This machinery is integral to the pulp-making process and falls under tariff item 8439.10.00 for machinery for making pulp of fibrous cellulosic material.

Rebuilt Crystal Boule Grinder

A rebuilt grinder for shaping silicon crystal boules to precise diameters and flats indicating conductivity. This machine is classified under tariff item 8439.10.00 as machinery for making pulp of fibrous cellulosic material, being a rebuilt unit for semiconductor wafer preparation.

Rebuilt Czochralski Crystal Puller

A rebuilt machine used to produce monocrystalline silicon boules from molten silicon via the Czochralski method, essential for semiconductor wafer manufacturing. This machine is classified under tariff item 8439.10.00 as machinery for making pulp of fibrous cellulosic material.

Rebuilt Pulp Digester Reboiler for Semiconductor Substrates

A rebuilt pressure vessel for chemical digestion of fibrous cellulosic materials, adapted for semiconductor precursor processing. This equipment is classified under tariff item 8439.10.00 as machinery for making pulp of fibrous cellulosic material.

Rebuilt Wafer Lapping Machine

A rebuilt lapping machine for flatness correction on semiconductor wafers prior to polishing. This machine is classified under tariff item 8439.10.00 as machinery for making pulp of fibrous cellulosic material.

Sulfite Pulp Cooker

A sulfite pulp cooker is machinery using calcium or magnesium bisulfite solutions to cook wood chips for sulfite pulp production, yielding high-brightness pulp for specialty papers, and maintaining acidic cooking conditions for fiber separation. This machinery is used for making pulp of fibrous cellulosic material, fitting tariff item 8439.10.00.

Used Float Zone Crystal Grower

A used float zone furnace for growing high-purity silicon crystals by melting a polycrystalline rod without a crucible. This equipment is classified under tariff item 8439.10.00 as machinery for making pulp of fibrous cellulosic material.

Used Paper Stock Washer for Wafer Cellulose

This is a used paper stock washer designed to remove impurities from pulp stock, specifically suitable for cellulose used in semiconductor paperboard substrates. It falls under tariff item 8439.10.00 because it is machinery for making pulp of fibrous cellulosic material, and its used condition does not affect its classification.

Used Semiconductor Wafer Polisher

This is a used chemical-mechanical polisher (CMP) used for surface finishing of silicon wafers to achieve atomic flatness. Despite its use in semiconductor manufacturing, it is classified under tariff item 8439.10.00 as machinery for making pulp of fibrous cellulosic material, based on the statistical note indicating wafer polishers fall under this item.

Used Wafer Slicing Diamond Saw

This is a used diamond wire saw used for slicing thin wafers from monocrystalline semiconductor boules. It is classified under tariff item 8439.10.00 as machinery for making pulp of fibrous cellulosic material, per the statistical note indicating wafer slicing saws fall under this item.

Wood Chip Impregnator

A wood chip impregnator is equipment that pre-treats wood chips by impregnating them with cooking liquor before digestion, improving pulp yield from fibrous cellulosic material, with features for downflow or upflow liquor penetration. This machinery is used in the pulp-making process and falls under tariff item 8439.10.00 for machinery for making pulp of fibrous cellulosic material.

Beloit Concept Paper Machine

The Beloit Concept Paper Machine is a twin-wire gap former designed for high-turbulence forming of quality printing papers. It falls under tariff item 8439.20.00 as machinery for making paper, specifically the forming section that shapes the paper web from pulp.

Corrugated Board Production Line

The Corrugated Board Production Line includes new single facer and double facer machines that flute paper webs and glue them into corrugated board for box making. It falls under 8439.20.00 as new machinery for making paperboard.

Corrugated Paperboard Production Line

The Corrugated Paperboard Production Line is an integrated system with single facer, glue machine, double backer, and slitter-scorer for making corrugated paperboard. It qualifies under 8439.20.00 as machinery dedicated to paperboard manufacturing.

Cylinder Mold Paper Machine

The Cylinder Mold Paper Machine is a new vat machine using rotating cylinder molds covered with wire cloth to pick up pulp and form paper sheets, ideal for heavier board grades. It is classified under 8439.20.00 as new machinery for paperboard production.

Cylinder Paper Machine

The Cylinder Paper Machine uses rotating wire-mesh-covered cylinders to pick up pulp from a vat and form paper sheets, typically for board grades. It is classified under 8439.20.00 as machinery for making paperboard.

Folding Boxboard Machine

The Folding Boxboard Machine is a multi-layer board machine producing coated folding boxboard for packaging with high print quality. It falls under 8439.20.00 as machinery for making paperboard.

Fourdrinier Paper Making Machine

The Fourdrinier Paper Making Machine forms a continuous paper sheet from a dilute pulp slurry on a moving wire mesh, followed by pressing and drying. It is classified under 8439.20.00 as machinery specifically for making paper.

Inverform Paper Machine

The Inverform Paper Machine is a new inverted forming technology machine creating a paper web between two wires for superior formation and drainage. It falls under 8439.20.00 as innovative new paper-making equipment.

Kraft Paper Linerboard Machine

The Kraft Paper Linerboard Machine is a large-scale machine producing kraft linerboard for corrugated containers using high-yield softwood pulp. It falls under 8439.20.00 as machinery for making paperboard.

Kraft Paper Manufacturing Machine

The Kraft Paper Manufacturing Machine is a new specialized line for kraft process paper using recovery boiler integration and high-speed former for strong unbleached paper products. It falls under 8439.20.00 as new paper-making machinery.

Multi-Cylinder Paperboard Machine

The Multi-Cylinder Paperboard Machine uses multiple wire-covered cylinders for thick board grades like linerboard and medium, with high pulp consistency forming. It is classified under 8439.20.00 as specialized paperboard production equipment.

Multi-Wire Paper Forming Machine

A multi-wire paper forming machine is an advanced system that uses multiple wires to form multi-layered paper structures for packaging or printing grades from cellulosic pulp. This new equipment enhances paper strength and quality by allowing different pulp layers to be combined. It is classified under tariff item 8439.20.00 as machinery for making paper.

Nipko Paper Forming Machine

The Nipko Paper Forming Machine uses rotating perforated drums for gap former paper production, ideal for graphical grades. It falls under 8439.20.00 as dedicated paper-making technology.

Paper Machine Headbox

A paper machine headbox is a critical component that evenly distributes pulp slurry onto the forming wire, ensuring uniform paper formation. It operates with precise jet-to-wire speed ratio control, which is essential for producing consistent paper quality. This device is classified under tariff item 8439.20.00 as machinery for making paper or paperboard.

Paper Machine Vacuum Box

A paper machine vacuum box is a stainless steel component located under the forming wire, used to remove water via vacuum while supporting the fiber mat formation. It plays a vital role in the papermaking process by enhancing drainage and sheet formation. This component is classified under tariff item 8439.20.00 as part of machinery for making paper.

Press Section Paper Machine

A press section paper machine consists of a series of roll presses that remove water from the wet paper web between felts, critical for achieving the desired dryness before the drying section. This equipment is essential for the papermaking process and is classified under tariff item 8439.20.00 as machinery for making paper. It ensures efficient water removal and improves paper quality.

Rebuilt Fourdrinier Paper Machine

A rebuilt Fourdrinier paper machine is a continuous sheet-forming machine used in paper production to create a wet web of paper from pulp slurry on a moving wire mesh. This rebuilt machinery is classified under tariff item 8439.20.00 as machinery for making paper, specifically for rebuilt equipment.

Rebuilt Headbox for Paper Machine

A rebuilt headbox for a paper machine is a rectangular manifold that distributes pulp slurry evenly across the forming wire, controlling the basis weight profile. This rebuilt equipment is classified under tariff item 8439.20.00 as machinery for making paper, specifically for rebuilt papermaking components.

Rebuilt Paperboard Creper

A rebuilt paperboard creper is a machine with a doctor blade that crepes the paperboard surface to provide stretch properties. This rebuilt equipment is used in towel production and is classified under tariff item 8439.20.00 as machinery for making paper, specifically for rebuilt paper finishing equipment.

Rebuilt Paper Quality Control Frame

A rebuilt paper quality control frame is a machine frame with sensors that monitor paper web quality parameters during production. This rebuilt equipment is classified under tariff item 8439.20.00 as machinery for making paper, specifically for rebuilt papermaking machinery.

Rebuilt Paper Slitter Rewinder

A rebuilt paper slitter rewinder is a machine that slits master paper rolls into narrower widths and rewinds them, critical for converting operations. This rebuilt equipment is classified under tariff item 8439.20.00 as machinery for making paper, specifically for rebuilt paper finishing equipment.

Rebuilt Paper Stock Prep System

A rebuilt paper stock prep system is an integrated system that refines pulp to the proper freeness for papermaking. This rebuilt equipment is classified under tariff item 8439.20.00 as machinery for making paper, specifically for rebuilt paper machinery.

Rebuilt Pulp Paperboard Former

A rebuilt pulp paperboard former is a machine that forms thick paperboard webs from pulp slurry using multi-layer technology, used for corrugated board production. This rebuilt equipment is classified under tariff item 8439.20.00 as machinery for making paper, specifically for rebuilt papermaking machinery.

Rebuilt Tissue Paper Winder

This rebuilt tissue paper winder is used to wind finished tissue paper into parent rolls for subsequent converting operations. It includes tension controls and slitting capabilities, making it essential for paper finishing. Classified under tariff item 8439.20.00 as machinery for making paper or paperboard.

Tissue Paper Making Machine

The Tissue Paper Making Machine is a high-speed machine designed for producing thin tissue paper through wet pressing and Yankee dryer technology. It falls under 8439.20.00 as specialized machinery for making lightweight paper products.

Tissue Paper Production Line

A tissue paper production line is an integrated system for producing soft tissue paper, including a Yankee dryer cylinder, creping blade, and embossing units to create thin, absorbent paperboard sheets. This new machinery system is designed for efficient tissue production and is classified under tariff item 8439.20.00 as machinery for making paper.