Processing Machinery
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PCL thermal degradation bubbles
Problem Phenomenon
During PCL processing, thermal degradation produces bubbles and impurities, and product performance and appearance decline.
Cause Analysis
The PCL melt stays in the nozzle or barrel too long and thermally degrades; excessive temperature; repeated heating; degradation produces gas and discoloration; molecular chain scission.；During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
①Shortening of melt residence time; ②Temperature optimization to avoid excessive temperature; ③Avoid repeated heating; ④Timely machine cleaning; ⑤Removal of degraded material.；After adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Residence time control of PCL thermal degradation is the key; temperature management prevents overheating; machine cleaning maintains purity.；After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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