Molds & Tooling
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TPU Shrinkage Rate 0.4-1.4%
Problem Phenomenon
Product dimensional deviation, with obvious shrinkage differences between products of different hardness and wall thickness
Cause Analysis
TPU shrinkage rate 0.4-1.4% depends on hardness and wall thickness; the higher the hardness, the smaller the shrinkage; the greater the wall thickness, the larger the shrinkage; the mold margin must be determined according to the specific grade
Solution
①Mold margin allowed according to 0.4-1.4% shrinkage; ②Recalculate when hardness and wall thickness change; ③Correct precision parts after mold trial; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPU's low shrinkage is a dimensional advantage; but the wide 0.4-1.4% range requires precise margin according to grade; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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