Material Drying
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TPU reduced toughness and brittleness
Problem Phenomenon
The tensile and tear strength of the product decreases, it breaks easily when bent, and does not match the material datasheet performance.
Cause Analysis
Moist material undergoes hydrolysis causing molecular chain breakage; an excessively large recycled material ratio dilutes performance; too high or too low melting temperature both affect molecular weight retention; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①thoroughly dry the raw material; ②reduce the recycled material ratio; ③adjust the melting temperature to the grade-recommended window; ④test the mechanical properties of the product for verification; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPU toughness decline is mostly related to hydrolysis; moisture control is fundamental to maintaining polyurethane performance, and the recycled material ratio must be strictly limited; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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