Plastic Film Dewatering Machine Suppliers

Centrifugal dryers (spin dryers) use a high-speed rotating basket or drum to throw surface water off plastic flakes or film by centrifugal force. They are well-suited to rigid plastic flake and shorter-cut film pieces where the material flows freely in the rotating drum. A well-designed centrifugal dryer reduces moisture content from approximately 30–50% (after washing) to below 3–5% (surface moisture) in a single pass. A subsequent thermal dryer then reduces moisture to below 0.5% or less for pelletising. Centrifugal dryers are the most common mechanical dewatering stage in plastic recycling lines. Squeeze-roll dewatering machines (screw press or compaction dryers) mechanically compress wet plastic film between rollers or in a screw press to expel water — rather than spinning it off. They are particularly effective for long, tangled film pieces that do not flow well in a centrifugal dryer. Squeeze-type dewatering is used in lines handling whole agricultural mulch film, long shrink film strips, or other materials that present feeding challenges for centrifugal dryers. Some plant designs combine a squeeze dewatering stage with a centrifugal dryer to achieve lower final moisture content more efficiently.

Key specifications for a plastic film dewatering machine: throughput (kg/hour of wet plastic input — note that throughput in weight terms is lower after dewatering); moisture content reduction capability (input moisture % → output moisture %); motor power and energy consumption per tonne; material construction (stainless steel contact parts for food-adjacent applications); inlet dimension and feeding arrangement (gravity feed, conveyor feed, pump slurry feed); and screen or basket aperture size (affects minimum flake size that can be processed without passing through the screen). The dewatering machine must be sized to match the throughput of the washing stages upstream. Mismatched capacity — a dewatering machine smaller than the upstream washing output — creates a bottleneck that limits the whole line. Plan dewatering capacity with 15–20% headroom above the target line throughput.