Molds & Tooling
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TPU Hardness Range
Problem Phenomenon
TPU product hardness selection is difficult; shrinkage differences between different hardnesses in the same mold cause dimensional problems
Cause Analysis
TPU hardness range is extremely wide from Shore A60 to Shore D85; the higher the hardness, the smaller the shrinkage and the higher the processing temperature; mold design must allow margins according to the specific hardness
Solution
①Select hardness grade according to application requirements; ②Precisely calculate mold shrinkage margin according to hardness; ③Re-try the mold when changing hardness grade; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPU's wide hardness range is where design flexibility lies; but each hardness is an independent set of process parameters; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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