How to operate a plastic pelletizing machine
Time：
2017-11-14
When installing or removing the die head, screws, and other heavy components, operators of pelletizing machines must observe the following safety precautions: electrical hazards, thermal risks, rotating mechanical parts, and the handling of heavy components. The pelletizing workshop must be equipped with lifting devices to ensure safe production.
The key operational considerations for pelletizing machines vary from one application to another, yet they also share certain commonalities. This industry insight provides a concise overview of the standard operating procedures and essential pelletizing‑machine guidelines to keep in mind when extruding various products, regardless of the specific plastic being processed.
Plastic Granulator Operation: Starting Up
Generally, the condition can be assessed by examining the appearance of the extrudate: when the material exits the die uniformly and is well plasticized, it can proceed to the pull‑in shaping sleeve. Evaluating the degree of plasticization relies on experience—look for a glossy surface, free of impurities, foaming, charred material, or discoloration. Squeeze the extrudate between your fingers until it reaches a certain fineness; if no burrs or cracks appear and it exhibits some elasticity, this indicates good plasticization. If plasticization is inadequate, adjust the screw speed, barrel temperature, and die head temperature as needed until the desired level is achieved.
Various process parameters shall be regularly checked to ensure they are within normal operating ranges, as required by the process.
Shutdown Procedure for Plastic Pelletizing Machines
After extruding all the plastic from the pelletizing machine and stopping the feed, once the screw is exposed, turn off the barrel and die power supplies, halt heating, bring the screw and auxiliary equipment to a stop, and then switch off the pelletizer and its auxiliary units.
Assemble the machine head and clean the porous plate and all its components. To prevent damage to the internal surfaces of the machine head during cleaning, remove the connecting flange; use a steel blade to scrape out any residual material inside, then sand away any plastic adhering to the interior with sandpaper, followed by polishing. Finally, apply machine oil or silicone oil to prevent rust.
After removing the die head, clean the screw and barrel. Restart the extruder and feed in a stop‑material (or recycled scrap) to flush the screw and barrel; during this step, run the screw at a low speed to minimize wear. Once the stop material has been fully extruded into a powdery state, use compressed air to repeatedly blow out any remaining pellets and powder through the feed port and vent ports until no residual material remains inside the barrel. Then reduce the screw speed to zero, stop the pelletizer, and shut off the main power supply and the main cooling‑water valve.
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Hebei Shuangda Rubber Machinery Co., Ltd.
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