Processing Machinery
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PVC Warpage Deformation
Problem Phenomenon
Product warpage exceeded tolerance, deformation was obvious at uneven wall thickness, and assembly was difficult
Cause Analysis
PVC warpage originates from uneven cooling and wall thickness differences; poor heat conduction makes thick-wall areas cool slowly and shrink more; uneven holding pressure also causes density differences leading to deformation; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Uniform wall thickness design; ②optimize cooling water circuits for balanced cooling; ③optimize holding pressure and time for uniform shrinkage compensation; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
PVC warpage treatment relies on structural uniformity and cooling balance; holding pressure optimization is an auxiliary means; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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