Plastic Rotomolding Pulverizing Machine Description:

The PNMF series plastic rotomolding pulverizing machine produces powder from a broad range of thermoplastic resins using a centrifugal disc grinding mechanism. While LLDPE and HDPE are the dominant rotomolding resins globally, three additional materials in this machine’s operating range — MDPE, EVA, and PET — have distinct powder production requirements that differ from the standard polyolefin workflow.

MDPE (medium-density polyethylene, density 0.926–0.940 g/cm³) is used in rotomolding for water storage tanks, chemical containers, and agricultural products where the balance of HDPE rigidity and LDPE impact resistance is required. MDPE powder specification follows the same 35 mesh standard as LLDPE and HDPE rotomolding applications; the PNMF processes MDPE with the same disc gap setting as HDPE without configuration change.

EVA (ethylene-vinyl acetate) is more heat-sensitive than polyolefins — its softening point varies with VA content (14–28% VA is the typical rotomolding range, softening at 60–80°C). Grinding EVA requires the dual cooling system running at full capacity and a reduced feed rate to prevent disc temperature from rising above the material’s softening threshold. EVA powder is also used outside rotomolding: as a hot-melt adhesive powder (60–100 mesh for textile and packaging applications) and as a foam cushioning powder for shoe sole production.

PET (polyethylene terephthalate) is the hardest and highest-melting material in this group (Tm 250–260°C). PET powder is used in powder coating, rotomolding of chemical-resistant containers, and as a ground flake product from PET bottle or film recycling. Its hardness (higher than any standard polyolefin) means longer blade wear intervals than EVA or MDPE, but higher instantaneous impact load on the disc — SKD-11 blades are recommended for continuous PET grinding.

For LLDPE, LDPE, and HDPE rotomolding powder specifications, multi-unit system configurations, and the 35 mesh particle size requirement, see the LDPE HDPE PE LLDPE Rotomoulding Plastic Pulverizing Machine page.

Plastic Rotomolding Pulverizing Machine Technical Features:

• Single PNMF platform processes seven resin types — LLDPE, LDPE, HDPE, MDPE, PP, EVA, and PET are all within the 20–120 mesh operating range; disc gap, feed rate, and cooling intensity are adjusted per material via the PLC panel without hardware changes.
• Dual cooling essential for EVA — EVA’s low softening point (60–80°C at standard VA content) requires the water-cooled fixed disc and atomised rotating disc cooling to run simultaneously at full capacity; feed rate is reduced compared to polyolefin processing to maintain stable disc temperature.
• SKD-11 blades recommended for PET — PET’s higher hardness compared to polyolefins increases impact load on the disc blade edges; SKD-11 high-chromium steel extends replacement intervals under continuous PET grinding conditions.
• MDPE requires no special configuration — MDPE processes identically to HDPE on the PNMF; same disc gap, same feed rate, same cooling intensity. No parameter change needed when switching between HDPE and MDPE input grades.
• Adjustable output fineness (20–120 mesh) — 35 mesh for standard rotomolding resins (LLDPE, HDPE, MDPE, PP); 40–100 mesh for EVA hot-melt and foam applications; 40–80 mesh for PET powder coating.
• SKF bearings, Siemens motor — standard across PNMF-300 through PNMF-800; CE certified.

Plastic Rotomolding Pulverizing Machine Components:

Vibratory Feeding Magnetic vibratory feeder removes ferrous fragments before they reach the disc; feed rate is adjustable per material — lower settings for EVA, standard settings for MDPE and PET.	Pulverizer Disc Fixed disc water-cooled cavity + rotating disc atomised spray — dual cooling is the critical operating requirement for EVA; full disc specifications on the PNMF main page.
Whole Body Pulverizer Blade Standard for PNMF-300 to PNMF-500; customisable tooth geometry per resin type. D2 steel adequate for MDPE and EVA; SKD-11 recommended for PET.	Segment Pulverizer Blade For PNMF-600/800; resharpenable 4–5 times — recommended for continuous PET grinding where higher hardness increases wear rate versus polyolefin materials.
Temperature Control Thermostat-controlled solenoid valve pauses feed if disc temperature exceeds set threshold — the primary safety mechanism for EVA processing where material softening temperature is within 20–30°C of the normal operating range.	Vibrating Screen Real-time classification with automatic oversize return; screen mesh interchangeable across the 20–120 mesh range to cover all seven material types.
Bags Type Dust Catcher Standard option; pulse dust collector recommended for PET powder applications where finer particle size increases filter load.	Intelligent Control PLC panel with material-specific presets — stores separate feed rate and cooling settings for EVA, PET, and MDPE to reduce setup time when switching between resin grades.

Frequently Asked Questions

What is MDPE and how does it differ from HDPE and LDPE for rotomolding?

MDPE (medium-density polyethylene) has a density between LDPE and HDPE (0.926–0.940 g/cm³) and combines elements of both: better impact resistance than HDPE with better stiffness than LDPE. In rotomolding, MDPE is specified for agricultural storage tanks, water treatment containers, and applications requiring resistance to slow crack growth. From a pulverising standpoint, MDPE behaves identically to HDPE on the PNMF — same disc gap setting, same feed rate, same 35 mesh target. No configuration change is needed when switching between HDPE and MDPE input on the same machine.

Can the PNMF grind EVA to hot-melt adhesive powder specification?

EVA hot-melt adhesive powder is typically specified at 60–80 mesh (approximately 180–250 µm) with narrow particle size distribution for consistent flow in adhesive dispensing equipment. The PNMF can produce this specification, but EVA’s low softening point (60–80°C at standard VA content of 14–28%) requires the dual cooling system at full capacity and reduced feed rate to prevent disc temperature from reaching the material’s softening threshold. For facilities processing EVA in warm ambient environments (above 30°C), the optional external chiller is recommended to maintain consistent disc temperature across extended production runs.

Is this the same machine as the LDPE HDPE PE LLDPE Rotomoulding Pulverizing Machine?

Yes — both pages describe the PNMF series disc pulverizer with the same five models (PNMF-300 to PNMF-800) and identical specifications. The distinction is in material focus: the LDPE HDPE PE LLDPE page covers the primary rotomolding resins in depth, including multi-unit parallel system configurations for 2,000–3,000 kg/h production. This page covers the extended material range — specifically MDPE, EVA, and PET — and their individual processing requirements that differ from standard polyolefin operation.

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