Plastična odvjetnička mašina: Kompletni vodič za vrste, specifikacije i izbor

A stroj za odvodnjavanje plastike mechanically removes water from washed plastic flakes, film, or regrind before they enter thermal drying, pelletizing, or extrusion. Without it, your recycling line either spends 4–6× more on energy (trying to evaporate water thermally) or produces off-spec output. This guide covers the three main types of plastic dewatering machines, their target materials, specifications, and a 5-step selection framework for sizing the right unit for your recycling line.

For the broader drying process — including thermal drying, crystallization, and full system design — see our plastic drying system pillar guide. For PET-specific moisture targets, see the PET flake dryer guide.

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What Is a Plastic Dewatering Machine?

A plastic dewatering machine is a mechanical water-removal device that takes washed plastic at 30–70% moisture and discharges it at 2–15% moisture, depending on machine type and material. It is the bridge between the washing line and the thermal drying or extrusion stages of any plastic recycling operation.

The reason every production-grade recycling line uses a plastic dewatering machine comes down to energy economics. Removing 1 kg of water mechanically (centrifugal or screw press) takes 30–60 kWh per ton of plastic processed. Evaporating the same water thermally takes 250+ kWh per ton. Skipping mechanical dewatering and trying to dry flakes thermally directly from the washer is the single most common cause of overspending on energy in plastic recycling — see our centrifugal vs. thermal drying energy comparison for the calculations.

A typical recycling process places the plastic dewatering machine in stage 3:

1. Collection & Sorting — Plastic waste is gathered and separated by polymer type (PET, HDPE, LDPE, PP, PVC).

2. Pranje — Sorted plastics are washed to remove dirt, food residue, labels, and adhesives.

3. Mechanical Dewatering — A plastic dewatering machine removes free water from the washed material at low energy cost.

4. Thermal Drying — A hot air dryer evaporates residual surface moisture if the application requires it.

5. Pelletizing or Extrusion — Dry plastic is melted and converted to pellets or directly extruded into new products.

Inlet moisture varies dramatically by material: rigid plastic flakes (PET, HDPE, PP) leave the friction washer at 30–40% moisture; plastic films at 50–70%. The plastic dewatering machine reduces this to 2–5% for rigid flakes (centrifugal) or 8–15% for film (screw press), preparing the material for the next stage.

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3 Types of Plastic Dewatering Machines

The plastic recycling industry uses three distinct dewatering technologies, each engineered for specific material characteristics and throughput requirements.

1. Centrifugal Plastic Dewatering Machine

A centrifugal plastic dewatering machine spins washed flakes at 800–1,500 RPM inside a perforated screen drum. Centrifugal force throws water radially through the screen while plastic flakes discharge dewatered. Two configurations exist: vertical (compact, sub-1 ton/h) and horizontal (higher capacity, more uniform output). For the orientation comparison, see our horizontal vs. vertical centrifugal dewatering machine guide.

The centrifugal plastic dewatering machine is the default choice for any rigid plastic recycling line. It cannot handle film effectively because long flexible material wraps around the rotor paddles and stalls the machine.

2. Film Squeezer / Screw Press Plastic Dewatering Machine

For PE and PP film, a screw press or film squeezer plastic dewatering machine compresses water out by mechanical pressure. A rotating screw conveys wet film through a tapered chamber, building pressure against a perforated screen and forcing water to exit through the perforations. The film is simultaneously densified into a continuous strand or briquette ready for the downstream agglomerator or extruder.

For high-volume film operations above 1.5 ton/h, a centrifugalni stroj za odvodnjavanje plastične folije velike brzine with anti-wrap rotor design is the alternative — combines centrifugal speed with film-compatible rotor geometry.

3. Heavy-Duty Screw Press Plastic Dewatering System

For mixed waste, contaminated streams, or pre-dewatering of bulky materials, a heavy-duty screw press plastic dewatering machine handles inputs that would jam a centrifugal unit. The slower compression action (30–80 RPM screw rotation) tolerates rocks, metal fragments, and irregular pieces that occasionally pass through pre-screening.

Each plastic dewatering machine type addresses a different material challenge. Choosing the right one depends on input material form (rigid vs. film), throughput, target outlet moisture, and contamination level.

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Plastic Dewatering Machine Comparison Table

Tip	Mehanizam	Outlet Moisture	Propusnost	Najbolje za
Centrifugalni	High-speed rotor (800–1,500 RPM) inside perforated screen	2–5%	200–3,500 kg/h	PET, HDPE, PP rigid flakes
Cjedilo za film	Tapered screw compression against screen	8–15%	300–2,500 kg/h	PE/PP film, LDPE agricultural film, raffia
Vijčana preša	Slow compression for contaminated/mixed streams	10–25%	500–3,000 kg/s	Mixed waste, pre-dewatering, paper-plastic

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Why Every Recycling Line Needs a Plastic Dewatering Machine

1. Cuts Energy Cost by 4–6×

Mehaničko uklanjanje vode koristi 30–60 kWh po toni plastike. Termička evaporacija iste mase vode koristi više od 250 kWh po toni. Za liniju kapaciteta 1 t/h koja radi 4.000 sati godišnje po cijeni od 0,10 €/kWh, ugradnja stroja za odvodnjavanje plastike godišnje štedi 80.000–100.000 € u usporedbi s isključivo termičkim sušenjem.

2. Smanjuje težinu materijala 50–60% Prije transporta

3. Sprječava oštećenje ekstrudera i nedostatke kvalitete

Vlažne pahuljice koje ulaze u ekstruder uzrokuju probleme s vlagom u ventilaciji, nestabilnost taljenja, eksplozije pare u cilindru vijače i vidljive nedostatke u izlazu (srebrne pruge, praznine, krhkost). Kod PET-a, preostala vlaga iznad 50 ppm na ulazu ekstrudera uzrokuje hidrolitičku degradaciju IV — polimer postaje slabiji i mutniji pri svakom prolasku.

4. Uklanja lagane nečistoće zajedno s vodom

Centrifugalne plastične mašine za odvodnjavanje također izbacuju fragmente etiketa, sitne čestice i čestice prljavštine kroz perforiranu mrežu zajedno s vodom. Time se pročišćava tok pahuljica i smanjuje opterećenje onečišćenjem na nizvodnom postrojenju.

5. Omogućuje modularni dizajn linije

Plasticna mašina za odvodnjavanje stvara međustanicu u liniji — pahuljice se mogu nakratko pohraniti između odvodnjavanja i termičkog sušenja bez gubitka kvalitete, što omogućuje serijsko rad i prekide u CIP čišćenju bez zastoja cijele linije.

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Okvir za odabir plastične mašine za odvodnjavanje u 5 koraka

Korak 1 — Identificirajte obrazac za materijal. Tvrde ljuske (PET, HDPE, PP, ABS) → centrifugalna plastična mašina za odvodnjavanje. Folija (PE, PP, LDPE) → preša za foliju ili centrifugalna protiv zamatanja. Miješano/kontaminirano → robusna vijčana preša za primarno odvodnjavanje.

Korak 2 — Izračunajte vršni protok. Linije recikliranja rade u serijama s prekidima za čišćenje. Vršna brzina dovoda obično je 1,5–2 puta veća od dnevnog prosjeka. Linija koja obrađuje 10 tona tijekom osmosatne smjene ima vršni dovod od oko 1.500–1.800 kg/h. Dimenzionirajte stroj za odvodnjavanje za vršni, a ne za prosječni protok.

Korak 3 — Odredite ciljanu vlažnost na izlazu. Za izravnu ekstruziju HDPE/PP prihvatljivo je 3–51 TP7T. Za peletizaciju PET-a ili bilo koji ciljani udio vlage ispod 11 TP7T izlazni udio vlage iz stroja za odvodnjavanje mora biti ≤41 TP7T kako bi veličina termičke faze ostala upravljiva. Svaki dodatni postotni bod izlazne vlage iz stroja za odvodnjavanje povećava toplinski opterećenje za 60–80 kWh/t.

Korak 4 — Usklađivanje materijala za konstrukciju s polimerom. SS304 nehrđajući čelik za PET (kontakt s hranom), ugljični čelik prihvatljiv za HDPE/PP, kiselinski otporni legura za PVC (isparavanje klora). Neusklađena konstrukcija uzrokuje prijevremenu koroziju i kontaminira izlazni tok.

Korak 5 — Provjerite pristup za održavanje. Vertikalne centrifugalne plastične mašine za odvodnjavanje imaju pristup s vrha (promjena sita za 30 minuta). Horizontalne jedinice zahtijevaju uklanjanje krajnjeg poklopca (1–2 sata, dva tehničara). Vijačne preše zahtijevaju pristup komori vijka za čišćenje začepljenja. Uskladite složenost održavanja s vašim internim kapacitetima.

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Uobičajeni problemi i rješenja

Vlažnost na izlazu iznad specifikacija. Uzrok: tupa ili istrošena rešetka, nedovoljno snažan motor ili prekoračenje vršnog protoka. Rješenje: pregledajte i zamijenite perforiranu rešetku, provjerite ampernu potrošnju motora pri vršnom opterećenju i potvrdite da je stroj dimenzioniran za vaš vršni protok (a ne za prosječni).

Lom pahuljica tijekom odvodnjavanja. Uzrok: brzina rotora previsoka za materijal (posebno PET, koji je krhak). Rješenje: smanjite brzinu rotora na 1.000–1.200 o/min za PET, prebacite na horizontalnu konfiguraciju za ispuštanje vode pri nižoj brzini, provjerite da veličina perforacija na sita odgovara dimenzijama pahuljica.

Film se omotava oko rotora. Uzrok: standardna centrifugalna plastična mašina za odvodnjavanje koja se koristi na filmskom materijalu. Rješenje: prijeđite na prešu za film ili centrifugu za film protiv namotavanja dizajniranu za fleksibilni materijal.

Prekomjerni troškovi energije. Uzrok: nedovoljne veličine mašina za odvodnjavanje prisiljava termalnu fazu da isparava većinu vode. Rješenje: nadogradnja na plastičnu mašinu za odvodnjavanje veće kapacitete ili rad dviju jedinica u seriji prije termalne faze. Vlažnost u centrifugalnoj fazi treba biti 2–5%, a ne 8–10%.

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Cesto postavljana pitanja

Što je sušilna mašina za plastični otpad?

Stroj za odvodnjavanje plastike je mehanički uređaj za uklanjanje vode koji se koristi u linijama za reciklažu plastike za smanjenje vlažnosti u opranim peletima ili foliji s 30–70% (nakon pranja) na 2–15% (ovisno o vrsti stroja i materijalu) prije termičkog sušenja ili izravne ekstruzije. Tri glavne vrste su centrifugalne mašine za odvodnjavanje krutih pahuljica, preše za fleksibilne folije i robusne vijčne preše za miješane kontaminirane tokove.

Kako činjenje vodootpornog stroja za recikliranje plástika spašava energiju?

Mechanical water removal uses 30–60 kWh per ton of plastic. Thermal evaporation of the same water mass uses 250+ kWh per ton — roughly 4–6× more. Installing a plastic dewatering machine before a thermal dryer typically saves $80,000–$100,000 per year for a 1 ton/h line running 4,000 hours annually. The capital cost of a centrifugal dewatering unit pays back in 6–18 months for most production lines.

Kakav nivo vlažnosti može postići stroj za odvajanje vode iz plástika?

Centrifugal plastic dewatering machines achieve 2–5% outlet moisture on rigid flakes (PET, HDPE, PP) in a single pass. Film squeezers reach 8–15% on flexible films. Heavy-duty screw presses for mixed waste typically discharge at 10–25%. For lower moisture targets (sub-1%), mechanical dewatering is followed by a thermal drying stage — see our vodena sustava za sušenje plastike vodič.

Koliko košta stroj za odvodnju plástika?

Vertical centrifugal plastic dewatering machines cost $8,000–$18,000 USD for 200–1,000 kg/h capacities. Horizontal centrifugal units cost $15,000–$45,000 for 800–3,500 kg/h. Film squeezers cost $15,000–$80,000. Heavy-duty screw press dewatering systems cost $20,000–$100,000. Final price depends on motor power, rotor diameter, construction material, and automation level.

Centrifugal dewatering vs. screw press: which is better?

It depends entirely on material form. Centrifugal plastic dewatering machines achieve lower outlet moisture (2–5% vs. 10–25%) and use less energy per ton, but cannot handle film. Screw presses handle film, mixed waste, and contaminated streams that would jam a centrifugal unit, but discharge at higher moisture and need a downstream stage. For rigid flakes, choose centrifugal. For film and mixed waste, choose screw press or film squeezer.

Moram li potrebni termički sušilac nakon mojeg stroja za odvodnju vode iz plástika?

For HDPE/PP destined for low-spec extrusion (pipe, pallet), no — centrifugal dewatering at 3–5% moisture is sufficient for most HDPE/PP extruders. For PET (any grade), film with extrusion-grade output, or any application requiring sub-1% moisture, a thermal dryer is required after the plastic dewatering machine. See our PET flake dryer guide for PET-specific moisture targets by end application.

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Zaključak

A plastic dewatering machine is the cheapest water-removal step in any plastic recycling line — typically 4–6× lower energy cost per kg of water removed compared to thermal drying. Specify it based on input material form (rigid flake vs. film vs. mixed), peak throughput, target outlet moisture, and downstream process requirement. For rigid flakes, choose a centrifugal unit; for film, a squeezer or anti-wrap centrifuge; for contaminated mixed streams, a heavy-duty screw press.

Energycle manufactures the full range of plastic dewatering machines for recycling lines from 200 kg/h to 3,500 kg/h: centrifugal plastic dewatering machines, film stiskacima, high-speed film centrifugal units, i screw press dewatering systems. Kontaktirajte našu inžinjerijsku tim with your material type, throughput target, and downstream process — we will recommend the right plastic dewatering machine and integrate it with your existing or planned linija za pranje rublja ili sustav sušenja.