A sušilica za plastičnu foliju reduces moisture in washed plastic film — LDPE stretch wrap, LLDPE shopping bags, agricultural mulch film, PP woven sacks, raffia — from 50–70% (post-wash) down to 1–3% before the film enters a pelletizer or agglomerator. Standard centrifugal dewatering machines fail on film because long flexible material wraps around rotor paddles and stalls the equipment. This guide covers the three plastic film dryer types that actually work, their target materials, specifications, and a 5-step selection framework for sizing the right machine for your film recycling line.
For the broader drying process across all materials, see our plastic drying system pillar guide. For rigid flake applications, see the horizontal vs. vertical centrifugal dewatering machine guide instead. This article focuses specifically on plastic film.
Why Plastic Film Drying Is Different from Rigid Flake Drying
Three properties make plastic film fundamentally harder to dry than rigid flakes (PET, HDPE, PP):
- Niska gustoća u nasipu — washed PE film bulk density is 30–80 kg/m³, vs. 250–400 kg/m³ for rigid flakes. Equipment sized by mass throughput must move 4–8× more volume per kg, requiring different feed and conveying systems.
- High water-holding capacity — film traps water in surface area and folds rather than just on flake surfaces. Inlet moisture is typically 50–70%, vs. 30–40% for rigid flakes — almost double the water mass per kg of plastic.
- Wrapping behavior — long flexible film wraps around any rotating element (rotor paddles, screw flights, conveyor shafts). Standard centrifugal dewatering machines stall within minutes of feeding film.
These three challenges drive the three production-grade plastic film dryer types, each engineered to handle the wrapping and bulk density issues that make standard centrifugal dewatering fail on film.
3 Types of Plastic Film Dryers
1. Plastic Film Squeezer (Screw Press Dryer)
The stiskač plastične folije uses a tapered screw inside a perforated barrel to apply continuous mechanical pressure on washed film. As the screw conveys material through the tapered chamber, pressure builds and forces water out through the screen perforations. Friction between the plastic and barrel walls generates heat, which combines with pressure to densify the film into semi-plasticized granules ready for pelletizing.
- Best Material: LDPE/LLDPE stretch wrap, HDPE film, PP raffia, PP woven bags, agricultural mulch film, mixed soft plastics
- Outlet Moisture: 3–8% (lowest of any film dryer type)
- Output Density: Densified granules at 300–450 kg/m³ (5–10× input density), ready for direct pelletizing
- Protok: 300–2,500 kg/h
- Snaga motora: 30–110 kW
- Troškovi kapitala: $15,000–$80,000 USD
- Najbolje za: Most film recycling operations — combines dewatering and densification in one step, reducing total equipment count
The film squeezer is the default plastic film dryer choice for 70%+ of film recycling operations. The combined dewatering + densification means you don’t need a separate agglomerator — the squeezer output feeds directly into a single-screw pelletizer. The trade-off: the screw and barrel are high-wear components requiring 6,000–12,000 hour service life depending on material abrasiveness.
2. High-Speed Plastic Film Centrifugal Dewatering Machine (Anti-Wrap Rotor)
The centrifugalni stroj za odvodnjavanje plastične folije velike brzine uses a specialized anti-wrap rotor design — angled paddles or pin-and-comb geometry — that prevents film from wrapping around the rotor shaft. The high rotor speed (1,000–1,500 RPM) throws water radially through the screen while the anti-wrap features keep the rotor clear.
- Best Material: PE/PP film, especially clean post-industrial film with minimal contamination; high-volume operations
- Outlet Moisture: 8–15% (higher than squeezer because no compression)
- Output Density: Unchanged — output is loose film flakes, requiring separate agglomerator before pelletizing
- Protok: 800–2,500 kg/h (higher than squeezer)
- Snaga motora: 45–90 kW
- Troškovi kapitala: $25,000–$80,000 USD
- Najbolje za: High-throughput film operations (above 1.5 ton/h) where the squeezer’s compression action would create bottlenecks; clean post-industrial film with consistent quality
Anti-wrap film centrifuges scale to higher throughput than squeezers because they don’t depend on slow screw conveyance. The trade-off is higher outlet moisture and the need for a downstream densification step (typically a plastic film agglomerator) before pelletizing. Some lines use both: anti-wrap centrifuge for high-volume primary dewatering, then a smaller squeezer for final compaction.
3. Hot Air Pipeline Dryer for Plastic Film (Thermal Stage)
After mechanical dewatering (squeezer or centrifugal), film typically still carries 8–15% moisture — too wet for stable extrusion. A pipeline hot air dryer evaporates remaining surface moisture by conveying flakes pneumatically through a heated duct at 80–120°C (significantly lower than rigid-flake drying because film softens earlier).
- Funkcija: Final-stage thermal drying after mechanical dewatering — never used standalone for film
- Inlet Moisture: 8–15% (from upstream squeezer or anti-wrap centrifuge)
- Outlet Moisture: 1–3%
- Protok: 500–3,000 kg/s
- Motor + Heater: 7.5 kW blower + 80–200 kW electrical heater (or gas burner equivalent)
- Troškovi kapitala: $25,000–$80,000 USD
- Najbolje za: Any film line requiring sub-5% final moisture for stable extrusion; mandatory for premium-grade film recycling
The hot air pipeline dryer is the highest-energy stage in any plastic film dryer line — 120–180 kWh per ton evaporated. This is why mechanical dewatering (squeezer or anti-wrap centrifuge) is non-negotiable upstream: removing 1 kg of water mechanically costs 30–60 kWh; evaporating it thermally costs 250+ kWh. See our porivajte centrifugalne i zračne suše energije for the full math.
Plastic Film Dryer Comparison Table
| Tip | Outlet Moisture | Densifies? | Propusnost | Trošak kapitala | Najbolje za |
|---|---|---|---|---|---|
| Cjedilo za film | 3–8% | Yes (5–10×) | 300–2,500 kg/h | $15K–$80K | Most film operations; combines dewatering + densification |
| Anti-Wrap Centrifuge | 8–15% | Ne | 800–2,500 kg/h | $25K–$80K | High-volume clean film; needs separate densifier |
| Hot Air Pipeline Dryer | 1–3% | Ne | 500–3,000 kg/s | $25K–$80K | Final-stage thermal after mechanical dewatering |
Ključna stvar: 80% of film operations use a squeezer + thermal stage combination. High-volume clean-film operations may use anti-wrap centrifuge + thermal + agglomerator. Never use a standard rigid-flake centrifugal dewatering machine on film — it will jam within minutes.
Material-Specific Plastic Film Dryer Configurations
LDPE / LLDPE Stretch Film and Shopping Bags
The most common film recycling stream. LDPE stretch wrap from pallets, post-consumer shopping bags, and produce film all share similar characteristics: low contamination (when sorted properly), thin gauge (10–80 microns), and consistent recyclability. Standard configuration: friction washer → film squeezer (45–75 kW for 1 ton/h) → hot air pipeline dryer (100–120°C) → single-screw pelletizer. Total drying section investment: $50,000–$120,000 for 1 ton/h capacity.
HDPE Film (Heavy Bags, Industrial Packaging)
HDPE film is thicker (40–200 microns) and tougher than LDPE — requires more torque from the squeezer and tolerates higher rotor speeds. The squeezer screw needs nitrided alloy steel construction (38CrMoAlA) to handle the higher load; carbon steel screws wear out within 3,000 hours on HDPE. Outlet moisture and densification are similar to LDPE. The same standard configuration applies but with upgraded screw and gearbox specifications. Add 15–20% to capital cost over LDPE-only operations.
PP tkane vrećice i rafija
PP woven bags (cement, feed, fertilizer) and PP raffia (rope, twine) are heavier and more abrasive than PE film. The squeezer must handle the woven structure without jamming, which requires a specially designed screw geometry (lower compression ratio, longer feed zone). PP also needs slightly higher thermal drying temperature (110–130°C) due to its higher melting point. See our PP tkane vreće i linija za reciklažu rafije za integrirani raspored.
Poljoprivredni film (mulč, staklenik, silaža)
The most challenging film material. Agricultural mulch film carries 30–60% contamination by weight (soil, plant debris, sand, stones), heavily abrasive on screws and screens. Required configuration: pre-washing with sand-trap separators upstream of the dryer; squeezer with reinforced wear plates and replaceable screen segments; thermal stage at standard temperature; downstream filtration to remove residual contamination. Capital cost runs 30–50% higher than clean-film operations due to the wear-resistant components and additional filtration. Operating cost is 2–3× higher due to faster wear part replacement.
Mješovita folija (višeslojna ambalaža, tiskane folije)
Miješani mlazovi filmova (otisnute vrećice za kupovinu, višeslojna ambalaža za hranu, BOPP/PE laminati) zahtijevaju konfiguraciju s pritisnim valjkom i termičkom jedinicom, ali uz niža očekivanja u pogledu kvalitete krajnjeg proizvoda. Tiskarske boje i laminirna ljepila ne odvajaju se tijekom sušenja — ostaju u zbijenom krajnjem proizvodu. Pogodno za peletiranje niske kvalitete u vrećice za smeće, vrtne proizvode ili pelete za gorivo, ali ne i za primjenu u kontaktu s hranom. Obavezno je ispitivanje materijala: pošaljite 50–100 kg svojih specifičnih miješanih folija proizvođaču kako biste provjerili učinkovitost odvodnjavanja i kvalitetu izlaza.
Okvir za odabir sušila za plastičnu foliju u 5 koraka
Korak 1: Odredite tip filma i izvor
Čisti post-industrijski LDPE/LLDPE → standardni prešivač + termička obrada. Post-potrošačka mješavina PE folija → prešivač s ojačanim vijkom + termička obrada + naknadna filtracija. PP tkanina/rafija → specijalizirana geometrija prešivača. Poljoprivredna folija → konfiguracija otporna na habanje s predprajnim separatorima. Mješovita/višeslojna → prešivač + termička obrada s realnim očekivanjima o kvaliteti izlaza. Odredite tip folije prije procjene specifikacija opreme.
Step 2: Izračunaj vrhunski protok
Linije za pranje filmova obično rade 6–8 sati po smjeni s prekidima za čišćenje. Vršni protok je 1,5–2 puta veći od dnevnog prosjeka. Postrojenje kapaciteta 10 tona dnevno ima vršni protok ulaznog materijala oko 1.500–1.800 kg/h. Ispod 1.500 kg/h odaberite prešu; iznad 1.500 kg/h razmotrite centrifugu protiv zamatanja za primarno odvodnjavanje plus opcionalnu manju prešu za zbijanje. Uvijek dimenzionirajte sušilo za vršni protok, a ne za dnevni prosjek.
Korak 3: Odredite ciljanu vlažnost izlaza
For direct pelletizing of premium-grade output (food-contact, regulated applications), target 1–3% — requires squeezer + thermal stage. For low-grade pelletizing (trash bags, garden products), 5–8% is acceptable — squeezer alone may suffice. For fuel pellet markets, 8–12% is acceptable. The moisture target determines whether a thermal stage is required and significantly affects capital cost.
Korak 4: Provjerite putanju zbijanja
Ako se koristi preša: izlaz je zbijen, spreman za izravno peletiranje — nije potreban zaseban agregator. Ako se koristi centrifuga protiv zapetljavanja: izlaz su labavi pahuljasti listići, prije peletiranja potreban je zaseban agregator. Ukupni trošak “centrifuge protiv zapetljavanja + agregatora + termičke jedinice” obično je jednak ili veći od troška “preše + termičke jedinice” za isti protok, ali nudi veći vršni kapacitet za masovne operacije.
Korak 5: Planirajte raspored zamjene trošnih dijelova
Vijci i cilindri ekstrudera su trošni dijelovi. Za vijak odredite nitrirani legirani čelik (38CrMoAlA, površinska tvrdoća HV 900+) i za zone habanja u cilindru umetke od kaljenog čelika SKD-11. Radni vijek: 6.000 sati (ugljični čelik) do 12.000+ sati (premium materijali). Potvrdite cijene rezervnih dijelova pisanim putem — vlasnički dijelovi koji vas vežu za jednog dobavljača česti su na tržištu sušila za film i uzrokuju 3–5× inflaciju troškova tijekom vijeka trajanja stroja.
Uobičajeni problemi sušila za plastične folije i njihova rješenja
Problem: zaglavljivanje squeezea na mokrom filmu
Cause: inlet moisture too high (above 70%) or feed rate exceeding rated throughput. Solution: install a vibrating dewatering screen upstream to drain free water before the squeezer (reduces inlet moisture from 70% to 50%); verify washing line discharge rate matches squeezer capacity; ensure the squeezer has a feed rate control valve to prevent surge loading.
Problem: Izlazni materijal je i dalje mokar nakon preše.
Cause: worn screen perforations enlarged from abrasion, dull screw flights, or screw rotation speed too high. Solution: inspect and replace the screen if perforations exceed 110% of original diameter; verify screw flight clearance against barrel wall (should be 2–4 mm — beyond 6 mm and material doesn’t compress); reduce screw RPM to allow more residence time per pass.
Problem: centrifuga protiv namotavanja se i dalje namotava
Uzrok: dizajn rotora neprikladan za vrstu folije ili brzina dovoda veća od nazivne propusnosti. Rješenje: provjerite je li rotor doista dizajniran za sprječavanje omotavanja (s iglama i češljem ili s koso postavljenim lopaticama), a ne preuređeni rotor za krute čestice; provjerite brzinu dovoda prema specifikacijama proizvođača; instalirajte pred-rezivač u ulaznom dijelu ako su komadi folije dulji od 200 mm (dulji komadi se agresivnije omotavaju od kratkih).
Problem: Prekomjerni troškovi energije na toplinskoj fazi
Uzrok: gornja mehanička faza proizvodi vlažniji izlaz od specifikacija (više od 12% vlage), prisiljavajući termalnu fazu da isparava većinu vode. Rješenje: provjerite vlažnost na izlazu preše (cilj 5–8%); pregledajte mrežu zbog trošenja; ako je vlažnost na izlazu stalno visoka, preša može biti premala — razmotrite rad dviju jedinica u seriji, nadogradnju na jedinicu veće kapacitete ili dodavanje centrifugalne faze protiv zamatanja prije preše.
Cesto postavljana pitanja
Što je sušilica za plastičnu foliju?
A plastic film dryer is equipment that removes moisture from washed plastic film (LDPE, LLDPE, HDPE film, PP woven, agricultural film) before pelletizing or extrusion. The three main types are: film squeezer (screw press, combines dewatering + densification, 3–8% outlet moisture), anti-wrap centrifuge (high throughput, 8–15% outlet moisture, requires separate densifier), and hot air pipeline dryer (final thermal stage, 1–3% outlet moisture). Most film recycling lines use a squeezer + thermal stage combination.
Zašto ne mogu koristiti obični centrifugalni sušilo na plastičnoj foliji?
Standardne centrifugalne mašine za odvodnjavanje krutih pahuljica imaju lopate rotora dizajnirane da bacaju kruti materijal na sito. Dugi fleksibilni film omotava lopate i vratilo, nakupljajući se u masu nalik ptičjem gnijezdu koja zaustavlja motor u roku od nekoliko minuta. Centrifuge protiv omotavanja koriste specijaliziranu geometriju rotora (s iglama i češljem ili koso oštricama) kako bi spriječile omotavanje. Za obradu filma potrebno je koristiti ili centrifugu protiv omotavanja ili vijčani prešač — nikada standardnu centrifugalnu jedinicu za odvodnjavanje.
Koliko košta sušilica za plastičnu foliju?
For a 1,000 kg/h film recycling line: film squeezer $30,000–$60,000, hot air pipeline dryer $30,000–$50,000, total $60,000–$110,000. Add 25–40% for premium configurations (nitrided alloy screw, branded PLC, anti-wrap centrifuge instead of squeezer). For agricultural film with wear-resistant components, total runs $90,000–$150,000. Below 500 kg/h, compact configurations are available from $25,000.
Koji bi izborao film stiskalac ili centrifuga protiv zaokretanja?
Ispod 1.500 kg/h: odaberite prešu za film — kombinira odvodnjavanje i zbijanje, nižu izlaznu vlažnost, jednostavniji raspored linije. Iznad 1.500 kg/h: razmotrite centrifugu protiv zamatanja za veći protok, ali prihvatite potrebu za zasebnim aglomeratorom prije peletiranja. Neke operacije velikog obujma koriste oboje: centrifugu protiv zamatanja za primarno brzo odvodnjavanje, a zatim manji prešač za konačnu denzifikaciju. Većina reciklera folije (70%+) koristi samo prešač.
Kakav nivo vlažnosti bi plastična folija trebala imati prije peliranja?
For premium-grade pellets (food-contact, regulated applications): 1–3% maximum, requires film squeezer + thermal stage. For general-purpose pelletizing (trash bags, garden products): 3–5% acceptable, may achieve with squeezer alone. For low-spec applications (fuel pellets): 5–10% acceptable. Above 10% moisture causes vent issues, melt instability, and visible defects in pellets — always include some thermal drying for any extrusion-grade output.
Mogu li film stisičar obraditi poljoprivrednu foliju sa zemljskim kontaminacijom?
Yes, but with significant wear penalty. Agricultural mulch film carries 30–60% soil contamination, which abrades the screw and screen 3–5× faster than clean film. Required upgrades: nitrided alloy steel screw (38CrMoAlA, hardness HV 900+), SKD-11 wear plates in barrel, replaceable screen segments. Pre-washing with sand-trap separators upstream reduces (but doesn’t eliminate) the wear. Operating cost runs 2–3× higher than clean-film operations; budget for screw replacement every 4,000–6,000 hours instead of 12,000+.
Zaključak
Pravi sušilac plastične folije odlučuje vaša vrsta folije, vrhunski protok i specifikacija izlazne vlažnosti. Za većinu operacija recikliranja folije ispod 1,500 kg/h, film stlačivač je optimalno jedinstveno strojno rješenje — kombinacija dehidracije i zaglađivanja s najnižom izlaznom vlažnošću. Za veći protok, razmislite o centrifugama protiv omotavanja s posebnom aglomeracijom. Uvijek uključite termički stupanj ako vaš izlaz ide na extrudiciju iznad niskog stupnja. Specifikirajte izdržljive komponente za poljoprivredne i kontaminirane tokove folije.
Energycle proizvodi cjelokupnu paletu sušilaca plastične folije: film stiskacima, brzi film centrifugalni dehidracijski stroj, i pipeline vrućeg zraka sušilni sustavi. Kontaktirajte našu inžinjerijsku tim s vašom vrstom folije, ciljnim protokom i specifikacijom krajnjeg proizvoda — preporučiti ćemo pravu konfiguraciju s potpunim BOM, raspored crtežem i planom zamjene izdržljivih dijelova.
Povezani resursi
- Plastic Drying System: Complete Pillar Guide
- Plastični dehidracijski stroj: Tipovi i specifikacije
- Centrifugalna protiv zračne suše: Porječanje energije i troškova
- PP tkane vrećice i linija za recikliranje rafije
- Uvod u efikasnost pranja folije PE
- Tehnologija stlačivača plastične folije i njegov ulog u recikliranju
