Molds & Tooling
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HDPE film die cavity debris streaks
Problem Phenomenon
Continuous streaks along the longitudinal direction appear on the film surface, with a fixed position.
Cause Analysis
Hanging material and debris in the die cavity disturb the local melt flow, making the discharge continuously abnormal at that position; after the accumulated material degrades, the streaks are also accompanied by color difference.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Regularly clean the die and die cavity; ②check the filtration system; ③lower the processing temperature to reduce degradation and hanging material; ④disassemble the mold and polish the flow channel.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Longitudinal streaks at a fixed position point to a local problem in the die cavity; cleaning and polishing the flow channel can directly eliminate them.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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