Processing Machinery
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HDPE film rough and uneven surface
Problem Phenomenon
The film surface is rough like frosted glass, sometimes with fine ripples and unevenness.
Cause Analysis
Unreasonable die head design with an overly long land section; too small die gap triggers melt fracture; impurities mixed into the raw material also destroy the surface flatness.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Check that the die head design and gap match the raw material; ②clean the accumulated material in the die head; ③screen the raw material to remove impurities; ④optimize the temperature to improve melt leveling.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Surface roughness should be distinguished into two categories: melt fracture and impurities; die head condition and raw material cleanliness are the two major troubleshooting directions.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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