Injection Molding
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LLDPE '2079851475616104452 shrinkage and warpage
Problembeschreibung
LLDPE injection molded parts warp less than LDPE, but control is still needed, with deformation at uneven wall thickness
Ursachenanalyse
LLDPE shrinkage 1.5-3% is lower than LDPE, with smaller warpage tendency; but wall thickness differences and uneven cooling still cause deformation; crystallinity of 55-65% determines shrinkage behavior
Lösung
①Uniform wall thickness design; ②balanced layout of cooling channels; ③optimize density distribution with holding pressure curve; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Wichtigste Erkenntnis
LLDPE's low shrinkage reduces but does not eliminate warpage; uniform wall thickness and balanced cooling remain fundamental engineering; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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