Molds & Tooling
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PP Glass Fiber Warpage
Problem Phenomenon
【Problem Phenomenon】Glass fiber PP warpage is harder to control than ordinary PP
Cause Analysis
Fiber orientation causes shrinkage anisotropy, superimposed with uneven crystallization; gate position determines orientation; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
Optimize gates to homogenize fiber orientation; uniform mold temperature; low-warpage grades; after adjustment, take continuous samples 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
The root of PP glass fiber warpage is orientation and crystallization, the gate is the key; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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