Fornecedores de máquinas de reciclagem de plástico

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The main stages of plastic recycling — what machinery does each stage need?

A complete plastic recycling line processes waste plastic through four main stages. Stage 1 — Size reduction: shredders, granulators, and crushers reduce incoming baled or loose plastic waste to chips or flakes of a consistent size (typically 10–30mm) suitable for washing. Heavy-duty single-shaft shredders handle mixed, baled, or large-format plastic; granulators are used for rigid plastic and pre-cut film. Stage 2 — Washing: the crushed flakes are cleaned to remove dirt, labels, adhesives, and contaminants. The washing section typically includes a friction washer (high-speed scrubbing to remove surface dirt), a sink-float separation tank (separates materials by density — PE and PP float; PET, PVC, and contaminants sink), a hot wash tank (for removal of adhesive labels and greasy contamination), and rinsing tanks. Stage 3 — Drying and dewatering: centrifugal dryers and thermal dryers remove water from the washed flakes to below the moisture level required for extrusion (typically below 1%). Stage 4 — Pelletising (optional): a single-screw or twin-screw extruder melts the clean dry flakes and extrudes pellets or strands that are water-cooled and cut — producing recycled plastic pellets ready for reuse in manufacturing. Complete turnkey lines and individual machines for each stage are available.

The main stages of plastic recycling — what machinery does each stage need?

Frequently asked questions

What is the typical throughput of a plastic film washing line?

Small-scale plastic film washing lines designed for post-industrial film typically process 300–800 kg/hour. Medium lines for post-consumer agricultural or packaging film typically process 800–2,000 kg/hour. Large commercial lines can process 2,000–5,000+ kg/hour. Throughput depends on input contamination level — heavily contaminated agricultural mulch film requires longer residence time in the washing stages and reduces net throughput compared to cleaner post-industrial film.

What is the difference between a friction washer and a hot wash system?

A friction washer (also called a high-speed friction cleaner) uses mechanical agitation — rapidly rotating blades or paddles in a water bath — to scrub surface contamination from plastic flakes. It is effective for removing loose soil, sand, and light organic contamination at ambient temperature. A hot wash system (caustic hot wash or surfactant hot wash) heats the wash water to 70–90°C with alkali or detergent to dissolve adhesive labels, grease, oils, and food residues — contamination that friction washing alone cannot remove. For processing consumer-grade HDPE bottles with adhesive paper labels or greasy food containers, a hot wash stage is typically required to achieve clean output.

Do I need a pelletiser (extruder) as part of my plastic recycling line?

Not necessarily. If your output market accepts clean washed and dried plastic flakes (many film and rigid plastic buyers use washed flake directly in their extrusion process), a washing and drying line without pelletising may be appropriate. Pelletising adds capital cost and energy cost but produces a more uniform, easier-to-handle product that commands a higher price per tonne and suits a wider range of end-user processes. The decision depends on your target customers' requirements and whether the value of pellets over flakes justifies the pelletising investment.

How do I compare Chinese and European plastic recycling machinery?

Chinese recycling machinery offers lower entry price and is commercially viable for standard waste streams — post-industrial film, PP woven bags, and clean rigid plastics. For heavily contaminated waste streams requiring complex washing chemistry, high automation, or integration with advanced sorting (NIR optical sorting), European systems (EREMA, Herbold, Starlinger) typically offer better process reliability and output quality — but at 3–6x the price. For buyers in developing markets or those building their first recycling line on a limited budget, Chinese machinery with proper specification and supplier selection is a practical and commercially proven option.

Fornecedores de máquinas de reciclagem de plástico

The main stages of plastic recycling — what machinery does each stage need?

Fornecedores de máquinas de reciclagem de plástico

The main stages of plastic recycling — what machinery does each stage need?

Material-specific recycling lines — matching the machine to the waste stream

Sourcing plastic recycling machinery — OEM suppliers vs package integrators

Frequently asked questions

What is the typical throughput of a plastic film washing line?

What is the difference between a friction washer and a hot wash system?

Do I need a pelletiser (extruder) as part of my plastic recycling line?

How do I compare Chinese and European plastic recycling machinery?

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