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
Separation Zone Width (ft)
Fan Power (HP)
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.
Removal By Air
An Acrowood Air Density Separator easily removes:
Blacktop or pavement
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.
In installations worldwide, reports are the same: The Acrowood ADS system provides maximum control for superior contaminant removal with minimum loss of good fiber.
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.
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.
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.
Ideal Industry Uses
The ADS configured for these industries is ideal for separation of:
Urban wood waste
Materials effectively cleaned with an ADS won’t cause damage to the plates used in MDF processes, and can be sent directly to refiners.
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.
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
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”.