Injection Molding
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LDPE Mold Temperature Uniformity
Problem Phenomenon
LDPE injection molded parts shrink inconsistently at various locations and warp.
Cause Analysis
Uneven mold cooling causes differences in crystallization shrinkage; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; This mechanism has been repeatedly verified by industry literature and should be confirmed first during troubleshooting.
Solution
Equalize water channels; cavity temperature difference ±5℃; strengthen water channels at thick walls; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; Change only one variable at a time and record parameter changes to facilitate locating effective measures.
Key Takeaway
Warpage is controlled by cooling uniformity; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; Incorporate this case into the defect archive as a troubleshooting reference for similar future problems.
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