Processing Machinery
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LDPE Film Surface Roughness
Problem Phenomenon
The film surface is rough and uneven like frosted glass, sometimes with fine ripples.
Cause Analysis
An overly long die land section or too small gap triggers melt fracture; raw material impurities also damage the surface; improper temperature control makes surface tension uneven.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Check the matching between the die and the raw material; ②Adjust die temperature for uniformity; ③Reduce extrusion speed to leave time for cooling; ④Strictly screen raw materials.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Investigate surface roughness from three directions: die, temperature, and raw material; a frosted-glass appearance mostly indicates a melt fracture tendency.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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