Molds & Tooling
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LDPE Film Die Cavity Debris Streaks
Problem Phenomenon
Continuous longitudinal streaks at a fixed position on the film surface, which disappear after cleaning the die.
Cause Analysis
Debris in the die cavity disturbs local melt flow causing uneven output; degraded hang-up material also forms persistent streaks.; During on-site troubleshooting, 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 screen to prevent impurity entry; ③Control temperature to reduce degraded hang-up material; ④Disassemble and polish the die when necessary.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Fixed-position streaks are the fingerprint of a local die cavity problem; establishing a regular cleaning system can prevent recurrence.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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