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After washing, loose PP and PE film can carry water between the flakes. This video shows a screw press treating film and bags at that point in the process. Look for the difference between the loose wet feed and the compacted material that comes out of the machine.
Mechanical dewatering after washing
A screw press compresses wet flexible plastic as it moves through the machine. Water exits through drainage openings while the film becomes a denser mass. This gives recyclers a way to reduce moisture and bulk in a single stage after washing.
If you are comparing this with a spin dryer, look at the form of the output as well as how much water is removed. A screw press produces compacted material, while a spin dryer typically leaves loose flakes. The next machine determines which output is more useful.
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