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
- Capital Cost: $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
- Capital Cost: $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)
- Capital Cost: $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 woven bags and raffia recycling line for the integrated layout.
Agricultural Film (Mulch, Greenhouse, Silage)
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.
Mixed Film (Multilayer Packaging, Printed Films)
Mixed film streams (printed shopping bags, multilayer food packaging, BOPP/PE laminates) require the squeezer + thermal configuration, but with lower expectations on output quality. Inks and laminating adhesives don’t separate during drying — they remain in the densified output. Suitable for low-grade pelletizing into trash bags, garden products, or fuel pellets, but not for food-contact applications. Material trial is essential: send 50–100 kg of your specific mixed film to the manufacturer to verify dewatering performance and output quality.
5-Step Plastic Film Dryer Selection Framework
Step 1: Identify Your Film Type and Source
Clean post-industrial LDPE/LLDPE → standard squeezer + thermal. Post-consumer mixed PE film → squeezer with reinforced screw + thermal + downstream filtration. PP woven/raffia → specialized squeezer geometry. Agricultural film → wear-resistant configuration with pre-washing separators. Mixed/multilayer → squeezer + thermal with realistic expectations on output quality. Identify the film type before evaluating equipment specifications.
Step 2: Izračunaj vrhunski protok
Film washing lines typically run 6–8 hours per shift with cleanup gaps. Peak throughput is 1.5–2× daily-average. A 10 ton/day operation has peak feed near 1,500–1,800 kg/h. Below 1,500 kg/h, choose a squeezer; above 1,500 kg/h, consider an anti-wrap centrifuge for primary dewatering plus optional smaller squeezer for densification. Always size the dryer for peak feed rate, not daily average.
Step 3: Specify Output Moisture Target
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.
Step 4: Verify Densification Path
If using a squeezer: output is densified, ready for direct pelletizing — no separate agglomerator needed. If using an anti-wrap centrifuge: output is loose film flakes, needs a separate agglomerator before pelletizing. The total cost of “anti-wrap centrifuge + agglomerator + thermal” typically equals or exceeds “squeezer + thermal” for the same throughput, but offers higher peak capacity for mass operations.
Step 5: Plan Wear Component Replacement Schedule
Squeezer screws and barrels are wear components. Specify nitrided alloy steel (38CrMoAlA, surface hardness HV 900+) for the screw and SKD-11 hardened steel inserts in the barrel wear zones. Service life: 6,000 hours (carbon steel) to 12,000+ hours (premium materials). Confirm spare parts pricing in writing — proprietary parts that lock you to one vendor are common in the film dryer market and cause 3–5× cost inflation over the machine’s lifetime.
Common Plastic Film Dryer Problems and Solutions
Problem: Squeezer Stalling on Wet Film
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: Output Material Still Wet After Squeezer
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: Anti-Wrap Centrifuge Still Wrapping
Cause: rotor design inappropriate for film type, or feed rate exceeding rated throughput. Solution: verify the rotor is genuinely anti-wrap design (pin-and-comb or angled paddle), not a relabeled rigid-flake rotor; check feed rate against manufacturer specifications; install a pre-cutter upstream if film pieces are longer than 200 mm (long pieces wrap more aggressively than short).
Problem: Excessive Energy Cost on Thermal Stage
Cause: upstream mechanical stage producing wetter output than spec (above 12% moisture), forcing thermal stage to evaporate bulk water. Solution: verify squeezer outlet moisture (target 5–8%); inspect screen for wear; if outlet moisture is consistently high, the squeezer may be undersized — consider running two units in series, upgrading to a higher-capacity unit, or adding an anti-wrap centrifuge stage before the squeezer.
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.
Why can’t I use a regular centrifugal dryer on plastic film?
Standard rigid-flake centrifugal dewatering machines have rotor paddles designed to throw rigid material against a screen. Long flexible film wraps around the paddles and shaft, accumulating into a bird’s-nest mass that stalls the motor within minutes. Anti-wrap centrifuges use specialized rotor geometry (pin-and-comb or angled paddle) to prevent wrapping. For film, you need either an anti-wrap centrifuge or a screw press squeezer — never a standard centrifugal dewatering unit.
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?
Below 1,500 kg/h: choose film squeezer — combines dewatering and densification, lower outlet moisture, simpler line layout. Above 1,500 kg/h: consider anti-wrap centrifuge for higher throughput, but accept the need for a separate agglomerator before pelletizing. Some high-volume operations use both: anti-wrap centrifuge for primary high-throughput dewatering, then a smaller squeezer for final densification. Most film recyclers (70%+) use the squeezer-only approach.
Kakav nivo vlažnosti bi plastična folija trebala imati prije peliranja?
Za premium-grade granule (hrana za kontakt, regulirane primjene): maksimalno 1–3%, zahtjeva film stlačivač + termički stupanj. Za općenito namjenjsko granulisanje (mješane torbe, vrtarski proizvodi): prihvatljivo 3–5%, može se postići s jednim stlačivačem. Za niskospecifične primjene (gorivo za pećnice): prihvatljivo 5–10%. Iznad 10% vlažnost uzrokuje probleme s ventilacijom, nestabilnost toplog tla i vidljive defekte u granulama — uvijek uključite neku vrstu termičke suše za svaki izlazni proizvod iz extruderske kvalitete.
Mogu li film stisičar obraditi poljoprivrednu foliju sa zemljskim kontaminacijom?
Da, ali s značajnim kaznom za iznošenje. Poljoprivredna mulčna folija nosi 30–60% kontaminaciju zemljišta, koja brže izluplja trubu i mrežu 3–5× nego čista folija. Potrebne nadogradnje: nitridirana legura čelika truba (38CrMoAlA, tvrdoća HV 900+), SKD-11 izdržljive ploče u cijevi, zamjenjivi dijelovi mreže. Predčišćenje s sand-trap separatorima sredinom smanjuje (ali ne eliminira) iznošenje. Trošak operacije iznosi 2–3× više nego operacije s čistom folijom; budžetirajte zamjenu trube svakih 4,000–6,000 sati umjesto 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
