Disc-Type Plastic Grinding Mill

The disc-type plastic grinding mill is a high-efficiency fine grinding equipment primarily used for recycling and processing thermoplastic plastics such as PE, PP, PVC, and ABS. Through the shearing, compression, and grinding action of the grinding discs, it pulverizes plastic pellets or waste plastics into uniform fine powder (20-200 mesh), making it suitable for applications like recycled pelletizing and 3D printing material preparation.

1. Equipment Structure & Working Principle

Core Components:

• Grinding Disc System:

• Combination of rotating and fixed discs, made of high-hardness alloy steel (e.g., SKD-11) or tungsten carbide coating for wear and corrosion resistance.

• Disc surfaces feature serrated grooves, oblique channels, or radial patterns to enhance shearing force.

• Drive System:

• High-power motor + gear reducer, with adjustable speed.

• Grading Screen:

• Replaceable mesh to control output fineness.

• Cooling System:

• Water-cooled jacket or air cooling to prevent plastic melting and sticking.

• Dust Removal System:

• Pulse dust collector or cyclone separator to minimize powder pollution.

Workflow:
Plastic material → fed into the inlet → sheared/ground by high-speed rotating discs → graded by screen → fine powder discharged (coarse material recycled for further grinding).

2. Suitable Materials & Fineness Range

• Applicable Materials:

• Soft plastics: PE films, PP woven bags, EVA foam.

• Hard plastics: PVC pipes,  ABS engineering plastics, PET sheets (pre-crushing required).

• Output Fineness:

• Coarse powder (1-5 mm):  For direct recycled pelletizing.

• Fine powder (80-200 mesh): For modified filling, powder metallurgy, etc.

3. Key Advantages

• High Efficiency &  Energy Saving: 20%-30% lower energy consumption than traditional blade grinders.

• Low-Temperature Grinding: Water cooling prevents thermal degradation of  heat-sensitive plastics.

• Uniform Particle Size: Precise fineness control via screens or air classification.

• Wear-Resistant Design: Disc lifespan reaches 1000-3000 hours (depending  on material hardness).

4. Common Issues & Solutions

• Issue 1: Coarse Output Particles
       → Check for screen damage or reduce feed rate.

• Issue 2: Rapid Temperature Rise
       → Increase cooling water flow or reduce continuous operation time.

• Issue 3: Severe Disc Wear
       → Replace with high-hardness discs (e.g., tungsten carbide) and avoid metal contaminants.

5. Maintenance & Care

• Daily: Clean residual plastic from the grinding chamber,  monitor bearing temperature.

• Weekly: Lubricate transmission parts, tighten bolts.

• Monthly: Inspect disc wear, replace screens if needed.

Application Examples:

• Waste PE Film Recycling: Grinding into 80-mesh powder for recycled PE pipe production.

• 3D Printing PLA/ABS Powder: Cryogenic grinding to 120 mesh for optimal flowability.