Material Drying
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TPU drying temperature graded by hardness
Problem Phenomenon
High-hardness TPU agglomerates and sticks after drying, or low-hardness TPU is under-dried and still has bubbles
Cause Analysis
TPU drying temperature is graded by hardness: Shore A75-90 uses 80-90℃ (dehumidification) or 100-110℃ (circulating air), Shore A90 and above uses 90-120℃ or 100-120℃; soft material agglomerates at high temperature, hard material does not dry at low temperature
Solution
①set the drying temperature graded by hardness; ②for soft TPU prefer low temperature and long time; ③prevent yellowing when drying exceeds 12 hours; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPU drying temperature must match hardness; the higher the hardness the higher the temperature, and a one-size-fits-all parameter will inevitably fail on one side; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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