Molds & Tooling
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PP Warpage Internal Stress
Problem Phenomenon
PP warpage internal stress, uneven cooling and shrinkage differences, stress management.
Cause Analysis
PP warpage internal stress; uneven cooling; shrinkage differences; wall thickness differences; uneven mold temperature; excessive holding pressure; structural design.; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Uniform cooling; ②uniform wall thickness; ③mold temperature management; ④holding pressure optimization; ⑤structural design.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Cooling and wall thickness are the basis of PP warpage; mold temperature and holding pressure are equally important; structural optimization prevents deformation.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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