Injection Molding
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LDPE '2079851475616104452 Shrinkage Allowance
Fenómeno do problema
LDPE injection molded parts have large dimensional deviation, and molds with allowance set for other polyolefins are not applicable
Análise das causas
LDPE shrinks 2-5% and varies with density grade; mold allowance must be determined according to the specific grade density; correction after trial molding is more reliable than setting the full allowance at once
Solução
① Set mold allowance of 2-5% according to grade density; ② reserve trial mold modification space; ③ test and finalize after dimensions stabilize; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Conclusão principal
LDPE mold allowance is a function of density; the trial mold correction route is more practical than theoretical calculation; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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