Plastics Purging Grinder
A plastics purging grinder is a heavy-duty grinding machine specifically designed to process hard, irregular, and dense purge blocks that result from plastic injection molding, blow molding, or extrusion line cleanouts. These purgings are notoriously difficult to break down, but a dedicated grinder can turn them into reusable granules for recycling or reprocessing.
✅ Suitable for Grinding:
- Plastic purging lumps from injection/extrusion lines
- Solidified plastic melt or cleanout waste
- Nylon, ABS, HDPE, PP, PET, PC, and other engineering plastics
- Thick-walled or irregular-shaped plastic scraps
✅ Advantages:
- Turns otherwise unmanageable purging waste into valuable regrind
- Helps reduce disposal costs and supports in-house recycling
- Protects downstream equipment by pre-sizing tough materials
- Offers quick ROI for facilities generating purge waste frequently
✅ Common Applications:
- Plastic injection molding plants
- Blow molding and extrusion factories
- Plastic recycling centers
- In-house waste recovery lines
⚙️ How a Plastics Purging Grinder Works:
- Loading the Purging Material:
- The operator loads solid plastic purge blocks or lumps into the hopper of the grinder.
- These purgings can be heavy, irregular in shape, and made from tough plastics like ABS, HDPE, PP, or nylon.
- Feeding into the Cutting Chamber:
- Gravity or a pusher mechanism moves the material from the hopper down into the cutting chamber.
- For safety and efficiency, some machines use conveyors or hydraulic feed rams.
- Size Reduction Begins:
- Inside the chamber, a high-torque rotor with rotating knives begins slicing into the purging lumps.
- Fixed blades on the side walls work together with the rotating knives to shear and grind the material into smaller pieces.
- Repeated Cutting Action:
- The material tumbles and circulates in the chamber as it is continuously cut down.
- Because purgings are dense and uneven, the grinder often works at lower speed with high torque to avoid stress and overheating.
- Cooling Systems (Optional):
- Some models include water cooling or air cooling systems to prevent melted plastic due to the friction and heat buildup.
- Passing Through the Screen:
- Once the particles are small enough, they pass through a perforated screen (usually under the cutting blades).
- The screen size determines the final granule size (e.g., 6mm, 8mm, 10mm, etc.).
- Collecting the Regrind:
- The ground plastic is discharged through an outlet chute, often into a collection bin or conveyor.
- The result is clean, uniform regrind ready for reuse in production or further pelletizing.
✅ Key Components Involved:
- Hopper (for loading material)
- Rotor with rotating knives
- Stationary blades
- Cutting chamber
- Screen mesh
- Discharge outlet
- (Optional: Cooling system or pusher/ram feed)
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