Processing Machinery
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COC Improper Screw Speed Poor Plasticizing
Problem Phenomenon
COC shows unmelted particles and uneven plasticizing, and after increasing the screw speed, overheating yellowing occurs; plasticizing quality and thermal stability are difficult to achieve simultaneously.
Cause Analysis
The recommended COC screw speed is 50~200rpm; too low, plasticizing energy is insufficient and unmelted particles are produced; too high, shear heat exceeds the limit and causes degradation; when the screw compression ratio does not match, the window is narrower.
Solution
①Set the screw speed in the 50~200rpm range and fine-tune with back pressure; ②select a screw configuration suitable for amorphous materials; ③verify with the dual indicators of actual melt temperature and plasticizing uniformity; ④troubleshoot section by section when abnormal.
Key Takeaway
COC plasticizing parameters have a clear official window; screw speed and back pressure are adjusted in linkage; actual melt measurement is the final basis for judging the plasticizing state.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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