Processing Machinery
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Poor LDPE Film Transparency
Problem Phenomenon
The film is hazy and its transparency is lower than the standard sample, affecting product grade.
Cause Analysis
Low barrel or die temperature gives poor plasticizing; insufficient bubble tube cooling causes coarse crystallization; the raw material optical grade is insufficient.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Appropriately raise barrel and die temperatures; ②Increase air ring air pressure and volume to strengthen cooling; ③Appropriately reduce extrusion speed; ④Switch to a high-transparency grade.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Transparency is determined jointly by plasticizing and cooling; adjust the process first and then evaluate material change, to avoid unnecessary cost increases.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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