Processing Machinery
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Poor LDPE Film Transparency
Problembeschreibung
The film is hazy and its transparency is lower than the standard sample, affecting product grade.
Ursachenanalyse
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.
Lösung
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.
Wichtigste Erkenntnis
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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