Material Drying
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Processing differences between TPU and SEBS-based TPE
Problem Phenomenon
Problems occur frequently when processing TPU with the SEBS-based TPE process.
Cause Analysis
TPU is more sensitive to moisture and has stricter drying requirements, otherwise it is very prone to hydrolysis producing bubbles and silver streaks; TPU is also more sensitive to shear, and excessive injection speed easily decomposes and burns.
Solution
①strictly implement drying standards for TPU; ②injection speed should not be too fast; ③set the temperature window according to TPU characteristics; ④do not copy SEBS process parameters.
Key Takeaway
The processing characteristics of TPU and SEBS-based TPE differ significantly; moisture and shear sensitivity are the two starting points of TPU process design; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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