The dewatering screw press is designed especially for our PE film washing line and is a very efficient way to remove water content from PP/PE film taken directly from the washing process. This robust piece of machinery offers excellent option for moisture reduction without the high cost (electricity cost) of operating thermal dryers.
to explain briefly how the dewatering screw press works, it is actually very similar in structure compared to a plastic extruder, however, with a screw shaft of increasing diameter. Surrounding the screw shaft is a thick, constant diameter barrel lined with holes for water outlet. As the screw shaft slowly rotates moving the PP/PE film forward, the screw shaft will become thicker in diameter and the film becomes increasingly pressed against the outer barrel. During this process, the moisture from the plastic film is squeezed out and exits the tiny holes.
At the end of the dewatering screw press, the diameter of the screw shaft is only slightly smaller than the inside diameter of barrel. It’s through this narrow gap that the dried PP/PE film squeezes out of the screw press. A well manufactured screw press will bring moisture content to acceptable levels of below 15%.
The common dewatering screw press for industrial recycling applications is 4-6 meters long, but can be increased or decreased based on your specifications.
Our lead time for single pieces of equipment is 30 days from the signing of purchase contract. For custom orders such as complete washing lines, the lead time is between 60 – 90 days. Actual lead times will depend on the project’s complexity as well as our factory’s availability.