Injection Molding
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LLDPE '2079851475616104452 shrinkage and warpage
Problem Phenomenon
LLDPE injection molded parts warp less than LDPE, but control is still needed, with deformation at uneven wall thickness
Cause Analysis
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
Solution
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
Key Takeaway
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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