Molds & Tooling
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TPU Shrinkage and Deformation
Problem Phenomenon
TPU products shrink and deform after leaving the mold
Cause Analysis
TPU shrinkage is 0.4-1.4% and elastic recovery causes shape change; when troubleshooting on site, verify item by item according to this mechanism, avoiding blind machine adjustment based solely on experience; this mechanism has been repeatedly verified by industry materials and should be confirmed first during troubleshooting
Solution
Design the mold with elastic recovery compensation; sufficient sizing cooling; inspect dimensions after aging; after adjustment, continuously sample 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
TPU dimensions must consider elastic recovery characteristics; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems later
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