Molds & Tooling
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GPPS Product Deformation and Warpage
Problem Phenomenon
The product warps and deforms after demolding, resulting in poor assembly.
Cause Analysis
Uneven cooling or improper holding pressure causes inconsistent shrinkage; although GPPS is a non-crystalline material, orientation stress can still cause warpage.; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Balance mold cooling; ②optimize the holding pressure curve; ③extend cooling and shaping; ④adjust gate position.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The main causes of warpage of non-crystalline materials are orientation stress and uneven cooling; mild process is the prevention direction.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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