Used Density Separators & Air Classifiers for Sale
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About Used Density Separators & Air Classifiers
Density separators and air classifiers sort recycled material by density and aerodynamic properties. Float-sink tanks separate polymers by specific gravity (for example PP/PE from PET/PVC), while air classifiers (zig-zag separators and air tables) remove light fractions like film, dust, and fluff from heavier rigid pieces. These systems are critical for producing clean, single-polymer recycling streams.
When buying a used density separator or air classifier, evaluate throughput, the density cut points required, and integration with upstream shredding/granulating and downstream washing. Meadoworks sources separation equipment for recyclers. Contact us at 800-323-0307.
How to Choose a Used Density Separator
Sink, float, or air
A float-sink tank splits polymers by specific gravity. PET and PVC sink. Polyethylene and polypropylene float. An air classifier, a zig-zag, or an air table pulls light film and dust off heavier rigid flake. They are not the same machine, and a listing that says both still has one of them in the frame.
The cut only works if the flake is the size the machine was built for. A whole bottle will not separate in a tank sized for flake.
The cut point
You need the pair of materials you are splitting, and a difference in density that water, or a salt bath, can see. Close densities do not separate because the tank is longer.
Rate, water quality, and the discharge of both fractions matter. A separator with one working conveyor still mixes the product.
Density Separator Specs to Compare
| Spec | Why it matters |
|---|---|
| Method | Float-sink or air. Read the frame. The name on the lot is not enough. |
| Cut | Which two materials it split last. PET versus PE is the common bottle cut. |
| Rate (lb/hr) | On flake of a named size. Whole bottles are a different machine. |
| Media | Water, a salt bath, or air. The supply has to exist in your plant. |
Method
Float-sink or air. Read the frame. The name on the lot is not enough.
Cut
Which two materials it split last. PET versus PE is the common bottle cut.
Rate (lb/hr)
On flake of a named size. Whole bottles are a different machine.
Media
Water, a salt bath, or air. The supply has to exist in your plant.
What to Inspect on a Used Density Separator
Identify the method
Tank or air. Do not buy a classifier to do a sink-float job.
Run both discharges
Each fraction needs a way out. One dead conveyor remixes them.
Check the media
Pumps, fans, and liners. A holed tank is the process.
Match the flake
Size and the two polymers. The last setup is the one that worked.
Related Equipment
- Wash Lines
Where a sink-float stage usually sits
More in Recycling & Size Reduction
Types of Size Reduction & Recycling
Common Applications
Frequently Asked Questions
How do density separators work in recycling?
Density separators sort material by specific gravity — float-sink tanks separate polymers that float (PP/PE) from those that sink (PET/PVC), while air classifiers use airflow to lift light fractions like film and dust away from heavier rigid pieces.
Related Resources
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