Molds & Tooling
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TPE Product Shrinkage and Warpage
Problem Phenomenon
Products shrink greatly and warp.
Cause Analysis
Insufficient holding pressure shrinkage compensation, uneven and insufficient cooling; drastic wall thickness changes in product structure and improper gate position and size make holding pressure unable to transmit effectively.; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based solely on experience
Solution
①Adopt sufficient holding pressure and time for shrinkage compensation; ②ensure uniform and sufficient cooling; ③optimize product structure to avoid drastic wall thickness changes; ④optimize gate position and size and evenly arrange cooling channels.
Key Takeaway
TPE shrinkage and warpage require comprehensive measures; coordinated treatment of process, structure and mold can be effective.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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