Waste PET Plastic Film Pulverizer Machine Description:

Waste PET plastic film — packaging film, food-grade transparent PET film, industrial polyester film, and PET strapping tape — cannot be fed directly into a disc pulveriser. Like all thin, lightweight plastic film, PET film bridges at the vibratory feeder inlet and wraps around moving parts rather than feeding through the grinding gap consistently. The two-stage process is standard: an agglomerator first compacts the loose film into dense granules, which the PNMF disc grinder then pulverises into fine powder.

PET film requires higher agglomeration temperature than PVC or PE film. PET’s glass transition temperature (Tg) is approximately 75°C — compared to PVC’s Tg of 60–80°C and PE’s brittle point well below zero. The agglomerator friction chamber must generate sufficient heat to bring PET film above its Tg before particles can fuse into granules. In practice, PET film agglomeration requires higher blade speed and longer residence time in the friction chamber compared to PE or PVC film. Output agglomerate from PET film is typically denser and more uniform in size than PE agglomerate, which feeds more predictably into the PNMF grinding stage.

Pre-drying is also required after agglomeration. PET absorbs moisture both during collection and during the water-quench cooling step that follows agglomeration. Agglomerate must be dried to below 0.2% moisture before entering the PNMF disc grinder — the same requirement as for PET flakes and resin pellets. A centrifugal dryer immediately after agglomeration, followed by a hot-air or dehumidifying dryer, is standard in PET film recycling lines.

The PNMF machine specification for PET film agglomerate is identical to the standard PNMF configuration described on the PVC Film Pulverizer page. The processing difference is entirely in the upstream agglomeration stage, not in the disc grinding machine itself.

Waste PET Plastic Film Pulverizer Machine Technical Features:

• Two-stage process: agglomerator + PNMF pulveriser — loose PET film is compacted into free-flowing agglomerate granules (3–10 mm) by the agglomerator, then ground to 20–120 mesh powder by the PNMF disc grinder. Both machines are available from WANROOETECH as a matched system with connected conveying.
• PET film requires higher agglomeration temperature than PE or PVC film — PET Tg of 75°C requires more friction energy in the agglomerator chamber before film particles fuse. Agglomerator blade speed and batch time are set higher for PET than for PE or PVC film on the same machine.
• Pre-drying required after agglomeration — PET agglomerate absorbs moisture during the water-quench cooling step; must be dried to below 0.2% moisture before PNMF grinding. Centrifugal dryer immediately post-agglomeration plus dehumidifying dryer is the standard sequence.
• Tg-aware PNMF cooling — the PNMF dual water-and-air cooling system maintains disc temperature below PET’s 75°C Tg threshold during continuous grinding; prevents surface tackiness of PET agglomerate particles at the disc contact zone.
• SKD-11 blades recommended for PET agglomerate — PET is harder than PE or PVC (Rockwell M94–M101); SKD-11 high-chromium steel provides longer service intervals under continuous PET grinding.
• Optional inline metal separator — for PET film from mixed post-consumer sources where metal contamination is possible, an inline electromagnetic separator at the powder discharge confirms iron-free output before packing.

Waste PET Plastic Film Pulverizer Machine Components:

Vibratory Feeding Receives pre-dried PET agglomerate from the dryer output; magnetic element captures residual ferrous fragments. Feed rate set for PET agglomerate bulk density (typically 250–400 g/L).	Pulverizer Disc Centrifugal disc with adjustable gap; dual water-and-air cooling essential for PET — maintains disc temperature below PET’s 75°C glass transition threshold. Full disc specifications on the PNMF main page.
Whole Body Pulverizer Blade Standard for PNMF-300 to PNMF-500; SKD-11 steel recommended for PET agglomerate due to higher material hardness versus PE or PVC film agglomerate.	Segment Pulverizer Blade For PNMF-600/800; resharpenable 4–5 times — recommended for continuous PET film recycling to reduce per-tonne blade cost against the higher wear rate of PET versus polyolefin agglomerate.
Temperature Control Thermostat-controlled solenoid valve pauses feed if disc temperature approaches PET’s 75°C Tg; prevents powder agglomeration without operator intervention during extended runs.	Vibrating Screen Real-time classification; PET agglomerate from film sources tends to have more consistent particle size than from mixed flake sources — recirculating load is typically lower, supporting higher effective throughput.
Bags Type Dust Catcher Standard option; for facilities processing food-grade PET film, pulse dust collector is recommended to maintain cleaner air quality in the grinding area.	Intelligent Control PLC panel with PET-specific temperature threshold settings and fault detection; production parameter logging for batch traceability in food-grade film recycling applications.

Waste PET Plastic Film Pulverizer Machine Optional Components:

Waste PET Plastic Film Pulverizer Machine Application Areas:

Post-consumer PET packaging film recycling. Transparent PET packaging film (shrink wrap, blister backing, food tray film) collected from retail or industrial sources is agglomerated and pulverised to 30–60 mesh for use as a recycled PET powder component in polyester compounding or for resale to plastic recyclers. PET film from food-contact applications must be sorted and washed before processing to remove residual food contamination.

Industrial PET film and strapping tape. PET strapping tape offcuts and industrial polyester film from manufacturing operations are consistent and relatively clean input sources. These materials agglomerate more uniformly than mixed post-consumer film, producing denser agglomerate granules that feed through the PNMF with higher effective throughput per kg/h than mixed-source film agglomerate.

PET mylar and capacitor film. Biaxially oriented PET film (BOPET/Mylar) from electronics manufacturing, solar panel film offcuts, and capacitor film waste are recycled into PET powder for use in polyester compound, PET powder coating, or fibre production. BOPET has higher orientation-induced crystallinity than standard PET film, which may increase agglomeration residence time requirements — confirm with WANROOETECH engineering for specific film grades.

Frequently Asked Questions

Why does PET film need to be agglomerated before pulverising — can it be fed directly like PET flakes?

PET flakes (from crushed bottles) are rigid, free-flowing fragments that feed consistently through a vibratory feeder by gravity. PET film is flexible, lightweight, and has very low bulk density — it bridges at the feeder inlet and wraps around the disc rather than passing through the grinding gap. Agglomeration uses friction heat to compact loose film into dense, rigid granules (3–10 mm) that have the flow characteristics needed for consistent vibratory feeder operation. Skipping the agglomeration step results in irregular feeding, poor powder output quality, and risk of film wrapping around the grinding disc mechanism.

How does PET film agglomeration differ from PE or PVC film agglomeration?

The agglomeration mechanism is the same — friction heat in a high-speed chamber fuses film particles into granules. The difference is in the processing parameters. PET has a glass transition temperature of approximately 75°C, which is higher than PE’s brittle-to-soft transition and comparable to some PVC grades. PET film requires higher blade speed and longer residence time in the agglomerator friction chamber to reach and maintain the temperature at which film particles fuse reliably. If the agglomerator is set for PE film parameters and switched to PET without adjustment, the output agglomerate will be inconsistent or powdery rather than forming solid granules. Additionally, PET agglomerate requires a post-agglomeration drying step (to remove moisture from the water-quench cooling) before PNMF grinding — this step is optional for PE but mandatory for PET.

What PET film sources are suitable for this recycling process?

The two-stage agglomerator + PNMF process handles transparent PET packaging film, PET shrink film, BOPET (biaxially oriented PET, including Mylar), PET strapping tape, and industrial polyester film. Metalized PET film (with aluminium vapour coating) requires sorting before agglomeration — the aluminium layer does not agglomerate cleanly with the PET base film and can contaminate the output powder. Heavily printed or laminated PET film may require washing before agglomeration to remove adhesive or ink residues that can affect agglomerate quality and output powder purity.

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