Plastic Film Dewatering Machine Suppliers
Source plastic film dewatering machines from verified B2B manufacturers on Towobo. After washing, plastic film flake carries significant surface moisture that must be removed before pelletising or direct sale as flake — excess moisture in the extruder causes poor pellet quality and potential equipment damage. Centrifugal dryers and squeeze-roll (screw press) dewatering systems are the primary mechanical dewatering technologies for film recycling lines. This guide covers machine types, their applications, and key specifications.
도매 조달을 시작할 준비가 되셨나요?
수십만 명의 구매자가 Towobo의 검증된 공급업체로부터 조달하고 있습니다.
Browse Plastic Film Dewatering Machine Suppliers on Towobo →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.
검증된 도매 공급업체를 찾고 있습니까? 지금 바로 목록을 확인하세요.
Browse Plastic Film Dewatering Machine Suppliers on Towobo견적 요청
필요한 것을 알려주시면 여러 검증된 공급업체로부터 견적을 받으세요
왜 견적을 요청해야 하나요?
- 여러 공급업체로부터 경쟁력 있는 가격을 받으세요
- 요구 사항에 맞는 맞춤형 제안을 받으세요
- 검증된 제조업체와 직접 연결하세요
- 매칭 서비스로 소싱 시간을 절약하세요
정기적으로 구매하시나요?
무료 구매자 계정을 만들어 공급업체를 저장하고, 직접 메시지를 보내고, 보호된 결제를 이용하세요.
관련 페이지
오늘부터 조달 시작하기
검증된 공급업체를 비교하고, 재고를 확인하고, 직접 연결하세요 — 모두 한 곳에서.
Browse Plastic Film Dewatering Machine Suppliers on Towobo →