EVA PS PET ABS PU Rotomolding Plastic Disc Grinder Pulverizer Mill Description:

The PNMF series rotomolding plastic disc grinder handles five materials listed in this page’s title — EVA, PS, PET, ABS, and PU — each with different processing characteristics on the centrifugal disc mechanism. The most distinct material in this group is PU (polyurethane), which covers two fundamentally different material types:

Thermoplastic PU (TPU) is a re-processable elastomer — the standard subject of “TPU pulverizer” searches. TPU powder at 20–80 mesh is used in powder coating (shoe uppers, sports equipment coatings), SLS 3D printing feedstock, and hot-melt adhesive applications. TPU is elastic at ambient temperature and requires cryogenic mode (liquid nitrogen) to embrittle before grinding to consistent fine powder on the PNMF disc. At ambient temperature, TPU deforms rather than fractures, producing irregular shreds rather than powder.

Thermoset PU (rigid PU foam, PU elastomer, PU rubber) is a crosslinked polymer that cannot be melted or reprocessed. Ground thermoset PU powder is used as a functional filler in new PU compound, rubber-modified asphalt, or construction material. Thermoset PU can be ground in ambient mode (it is brittle rather than elastic when dry), but pre-drying is required if the material has absorbed moisture.

The remaining four materials — EVA, PS, PET, ABS — are all thermoplastics:

• EVA: heat-sensitive (softening point 60–80°C depending on VA content); requires full dual cooling during disc grinding. For EVA foam waste recycling without pre-crushing, see the WRFP-200 EVA foam recycling machine — a fundamentally different machine for that application.
• PS (polystyrene): brittle at room temperature, grinds efficiently at ambient; the easiest of the five materials to process on the PNMF.
• PET: pre-drying required (below 0.2% moisture); disc temperature must stay below PET’s Tg of 75°C during grinding. See the PET Flakes Resin Powder Making Machine page for full PET processing details.
• ABS: standard ambient processing; impact modifier content may increase heat generation slightly versus pure PS.

For full PNMF machine specifications, component details, and model selection, see the PNMF PVC Film Pulverizer page which covers the complete platform.

EVA PS PET ABS PU Rotomolding Plastic Disc Grinder Pulverizer Mill Technical Features:

• Cryogenic mode for TPU — liquid nitrogen injection embrittles thermoplastic PU before grinding, enabling consistent 40–100 mesh powder output that cannot be achieved at ambient temperature where TPU deforms rather than fractures.
• Dual water-and-air cooling for EVA — EVA’s low softening point (60–80°C) requires both cooling systems at full capacity during continuous disc grinding; thermostat-controlled feed pause protects material quality if disc temperature approaches the threshold.
• Pre-drying required for PET and moisture-sensitive thermoset PU — PET requires drying to below 0.2% moisture; moist thermoset PU produces agglomerated powder rather than free-flowing fine powder.
• Single-piece and segment blade options — whole-body blades for PNMF-300 to PNMF-500; segment blades for PNMF-600/800 (resharpenable 4–5 times), reducing consumable cost for continuous engineering plastic powder production.
• 20–120 mesh output range, disc gap adjustable during operation — feeler gauge and adjusting bolt mechanism allows mesh target to be set and changed without stopping the machine.
• Optional accessories: chiller, screw loader, metal separator, pulse dust collector, weighing packer — full accessory range available; configuration matched to material type and production scale.

EVA PS PET ABS PU Rotomolding Plastic Disc Grinder Pulverizer Mill Components:

Vibratory Feeding Magnetic vibratory feeder removes ferrous fragments from input granules. For cryogenic TPU processing, the feeder handles embrittled TPU crumb from the cryogenic pre-cooling stage.	Pulverizer Disc Fixed disc water-cooled cavity + rotating disc atomised spray cooling; both essential for EVA processing. Disc diameter 300–800 mm across five PNMF models.
Whole Body Pulverizer Blade Standard for PNMF-300 to PNMF-500; customisable tooth geometry per material. D2 standard for most thermoplastics; SKD-11 for harder materials or higher-abrasion grades.	Segment Pulverizer Blade For PNMF-600/800; resharpenable 4–5 times. Recommended for continuous TPU or PET powder production where blade cost per tonne is a factor.
Temperature Control Thermostat-controlled solenoid valve pauses feed if disc temperature exceeds threshold — critical for EVA (softening point 60–80°C) and PET (Tg 75°C) applications.	Vibrating Screen Real-time classification with automatic oversize return. Screen mesh interchangeable for different target fineness across the five material types.
Bags Type Dust Catcher Standard option. For TPU powder (combustible fine dust) and PET grinding, ensure workshop grounding and dust containment per applicable safety regulations.	Intelligent Control PLC panel with material-specific presets; stores separate settings for cryogenic (TPU) and ambient (PS, ABS, EVA) processing modes, reducing changeover time in multi-material operations.

EVA PS PET ABS PU Rotomolding Plastic Disc Grinder Pulverizer Mill Application Areas:

Frequently Asked Questions

What is the difference between TPU powder and thermoset PU powder from this machine?

TPU (thermoplastic polyurethane) is melt-processable — it can be ground to functional powder for coating, SLS, or adhesive applications where the powder will be remelted during use. TPU requires cryogenic grinding (liquid nitrogen) on the PNMF because it is too elastic to fracture cleanly at ambient temperature. Thermoset PU (rigid PU foam, PU elastomer, PU rubber) is a crosslinked polymer that cannot be melted — its ground powder is used as an inert filler rather than a functional material that will be reprocessed by melting. Thermoset PU can be ground at ambient temperature because the crosslinked structure makes it brittle rather than elastic. The two types of PU produce powders with entirely different downstream applications and cannot be substituted for each other.

Does grinding PU create any safety concerns in the workshop?

During manufacturing, PU is formed by reacting polyol with isocyanate — the isocyanate component is a known respiratory sensitiser. In fully cured, dry PU products (solid foam, elastomer, rigid parts), the isocyanate has fully reacted and is incorporated into the polymer structure; residual free isocyanate levels are typically very low. However, grinding PU generates fine airborne dust, and some analytical studies have detected trace isocyanate-related compounds in PU dust depending on the curing state and age of the material. As a precaution, adequate workshop ventilation and respiratory protection should be used when grinding PU — either thermoset or TPU. A pulse dust collector is the recommended dust control specification for PU grinding, both for air quality and fire safety (fine polymer dust is combustible). Consult applicable occupational health regulations in your jurisdiction for specific requirements.

Can the same PNMF machine grind both cryogenic (TPU) and ambient (PS, ABS) materials in separate production runs?

Yes — the PNMF handles both modes in a single unit. Switching from ambient to cryogenic mode requires connecting the liquid nitrogen supply to the grinding chamber inlet. The PLC panel stores material-specific presets for each mode, reducing setup time between runs. Between material changeovers, a short purge run with clean input material or a manual cleaning cycle is standard practice to prevent cross-contamination of powder batches, particularly when switching between TPU and ambient-mode materials that will go to different downstream applications.

Video