Injection Molding
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LDPE '2079851475616104452 Warpage
Problem Phenomenon
LDPE injection molded parts warp and deform, and the assembly dimensional chain exceeds tolerance
Cause Analysis
LDPE has large shrinkage and warps when cooling is uneven; wall thickness differences and molecular orientation aggravate deformation; uneven cooling rate is the most common cause; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
① Wall thickness uniformity design; ② balanced arrangement of cooling water channels; ③ optimize the holding pressure curve for density distribution; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
LDPE warpage treatment is the same as HDPE; uniform wall thickness plus balanced cooling is the basic engineering; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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