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DISTRIBUTION & SEPARATION

Air Density Separator

Maximum control for superior contaminant removal

  • Air Density Separator
  • Separation Zone
acrowood-air-density-separator-feature
acrowood-air-density-separator-zone-feature

Acrowood Air Density Separator

Get superior contaminant removal with reduced loss of acceptable fiber. Small contaminants are efficiently removed, including, including non-ferrous metals, plastics, and other contaminants, by using the Acrowood Air Density Separator (ADS).

Air Density Separator Features

  • Effective removal of high density contaminants from a variety of woody or biomass materials
  • Excellent control over contaminant removal with adjustable air velocity and separation zone depth
  • Control system automatically compensates for changing flow rates and operating conditions
  • Years of operating experience in a variety of applications including pulp and paper woodyards, particleboard, urban wood waste, as well as other applications
  • Low fiber losses

Air Density Separator - Sizing

Model wdt_ID Separation Zone Width (ft) Fan Power (HP)
2914 1 2.4 60
4818 3 4 100
6020 4 5 125
7222 5 6 150
8624 6 7 200
air-density-separator-drawing-02

Precise Air Flow

Ideal for overthick slicing operations

Exact air flow control for superior separation efficiency allows the Acrowood Air Density Separator to easily remove knots and other contaminants.

One of the biggest dangers to pulp mill equipment is contamination from bits of wire and stones, nuts, bolts, and knots. Even pieces of brass, copper and nails can cause severe damage.

Air-Density-Separator New York Blower Fan

Removal By Air

An Acrowood Air Density Separator easily removes:

  • Knots
  • Stones
  • Rocks
  • Ice lumps
  • Blacktop or pavement
  • Bricks
  • Metal
air-density-separator-drawing-02

The Basic Principle

ADS systems operate on the basic principle that the density or weight of a contaminant is greater than the good oversize chips processed. But what makes a superior machine, an Acrowood machine, is the ability to create and control precise air movement in a larger separation area.

Air-Density-Separator Color ADS System

Reports Worldwide

In installations worldwide, reports are the same: The Acrowood ADS system provides maximum control for superior contaminant removal with minimum loss of good fiber.

Air-Density-Separator CCA 5 line Fans

Precise Control

The ADS includes an infeed rotary airlock; a tapered, ported separation chamber; transfer piping to and from the cyclone; a heavy duty cyclone; a high-performance industrial fan with a metal fabricated base; and the necessary electronic and air low control hardware.

The separation zone design is critical to provide maximum capacity and precision set-up for the feed materials.

Air-Density-Separator CCA 5 line Separation Zones 2

Maximum Selectivity

An adjustable back panel allows the large separation chamber to be preset for the most efficient operation. Maximum selectivity is achieved when the air flow permits uniform mixing of air and chips across the entire width of the chamber.

A rubber tipped rotary airlock feeds chips into the separation chamber, minimizing air leakage and preventing air backwash. Air turbulence is minimized by the chamber’s shape.

Air-Density-Separator-graphic-illustration

Effectively Remove Small Light Contaminants

The Acrowood Air Density Separator is ideal for a variety of industries, from the board industry to wastewood processing.

Incoming raw material can be effectively cleaned for particleboard and medium density fiberboard, removing contaminants that can cause costly damage to machinery and create waste in the end product.

Air-Density-Separator CCA 5 line Fan Dampers

Ideal Industry Uses

The ADS configured for these industries is ideal for separation of:

  • Sawdust
  • Urban wood waste
  • Hogged wood
  • Shavings
  • Chips

Materials effectively cleaned with an ADS won’t cause damage to the plates used in MDF processes, and can be sent directly to refiners.

Air-Density-Separator CCA 5 line Discharge Airlocks

Ready For Processing

Urban wood and wastewood materials can also be cleaned to remove rocks, nonferrous metals, plastics and fasteners, and large sand and grit.

The ADS has proven to be so effective that wood cleaned with an Acrowood ADS can be directly processed for production.

Air Density Separator

Separator Air Flow

Small sand and grit are light enough to be retained with the good fiber. Nuts, bolts, and broken rocks as small as the size of a match head (2-3 mm) will fall out consistently.

Since materials processed for these industries is typically very light, the separator can be configured for a lower air velocity that efficiently removes these smaller contaminants.

Engineered Model Diagram Drawing - of the Air Density Separator

air-density-separator-acrowood-diagram

Have a question?

Ask the contaminant removal equipment specialists, we are here solve your woodyard challenges and mill processes.

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The Air Density Separator brochure

Request the air density separator machine brochure provided to you in PDF format for easy reading and printing.

GET BROCHURE

Case Study: Pulping System Sensitivity to Chip Quality

Overall the only really objectionable “chips” are the knots present in the infeed flow. These are removed through the use of an Air Density Separator (ADS). Knots are the embedded branches that break out of the stem during chipping making large, resin-soaked, curly-grained dense wood chunks that do not grind into pulp but produce shives and “stickies”.

VIEW CASE STUDY

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Over a century of experience engineering equipment and machinery for pulp and paper, sawmill, panel board and biomass industries.

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Shipping Address

Acrowood Corporation
4425 S. Third Ave.
Everett, WA 98203
USA

Mailing Address

Acrowood Corporation
PO Box 1028
Everett, WA 98206-1028
USA
Tel: 1 (425) 258-3555
Fax: 1 (425) 252-7622

Posts

  • How Wood Product Manufacturers Can Benefit from Acrowood Machinery
  • Why Biomass and Renewable Energy Companies Should Invest in Acrowood Machinery
  • Biomass Pellet Production – Optimizing Efficiency with Acrowood Machinery
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© 2025 Acrowood | All Rights Reserved
  • Home
  • About
    • Executive Team
  • Products
    • Debarking Machines
      • Batch Debarker
      • Continuous Rotary Debarker
    • Chipping
      • Whole Log Chipper
      • Slant Disc Chipper
      • Veneer Chipper and Feedworks
      • Rechipper
      • Chip Cracker
      • Chip Slicer
    • Screening
      • Trillium® OSB Strand Screen
      • Disc Thickness Screen
      • HD Disc Scalping Screen
      • Dual Drive Suspended Rotary Screen
      • DiamondRoll® Fines Screens
      • DiamondRoll® Thickness Screens
      • DiamondRoll® Particle Screen
    • Distribution & Separation
      • Air Density Separator
      • Star Feeder
      • Screw Distributor
  • Development Center
  • Case Studies
  • Expertise
    • Pulp Mills
    • Saw Mills
    • Panel Board Mills
    • Biomass & Pellet Mills
    • DiamondRoll Shaft Wear [Assessment Guide]
    • Blacksmithing custom bolts the old fashioned way [Technical Article]
  • Contact
  • Jobs
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