塑料薄膜脱水机供应商
在Towobo上找到经认证的B2B塑料薄膜脱水机供应商——机械脱水机及离心干燥机，用于降低再生PE和PP薄膜造粒前的含水量。
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Centrifugal dryers vs squeeze-roll dewatering — choosing the right technology
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.
Machine specifications and integration with the washing line
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.
Frequently asked questions
Do I need a thermal dryer after a centrifugal dewatering machine?
For direct pelletising (feeding an extruder), a centrifugal dryer typically reduces moisture to 3–8% — still too high for most pelletising extruder designs. A thermal dryer (hot air dryer or friction thermal dryer) reduces moisture to below 1% (ideally below 0.5%) for extrusion. If your output is sold as washed flake rather than pellets, check the moisture specification required by your customers — some applications tolerate up to 3% surface moisture; others require below 1%. A thermal dryer stage is standard in complete plastic recycling lines that include pelletising.
What is a friction thermal dryer and how is it different from a hot air dryer?
A friction thermal dryer combines mechanical friction (similar in principle to a friction washer, but operating dry) with thermal drying — the high-speed rotor creates heat through friction while continuously agitating and conveying the film flake, simultaneously mechanically removing surface moisture and thermally evaporating residual moisture. Friction thermal dryers are compact and efficient for film drying but can cause some degradation of film flake if overheated. A hot air dryer uses a stream of heated air to evaporate moisture from the moving flake — gentler but requires more space and energy for equivalent throughput.
What moisture level does plastic film need to reach before pelletising?
The maximum acceptable moisture content for plastic film flake before pelletising depends on the extruder design. Most pelletising extruders for PE and PP operate well with feed material below 0.5% moisture. Some specially designed wet-feed or degassing extruders can accept up to 2–5% moisture and vent the steam during extrusion — these are used in some agricultural film recycling lines where getting to 0.5% moisture is difficult. Confirm the acceptable feed moisture specification with your extruder and pelletiser manufacturer before specifying the dewatering system.
Can centrifugal dryers process agricultural film directly from the washing line?
Agricultural mulch film — after washing — is in the form of short, torn, heavily saturated pieces that can be difficult to process in standard centrifugal dryers designed for clean cut film. Agricultural film-specific lines often use a squeeze-roll or screw press dewatering stage first, then a centrifugal dryer, to handle the irregular, tangled pieces. Confirm with the machine manufacturer that the dewatering equipment has been tested with agricultural film and can handle the specific contamination level and piece size of your material.
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