Material Drying
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TPE Drying Judgment
Problem Phenomenon
Drying is omitted because TPE is nominally low-hygroscopic, and bubbles appear in overmolded products
Cause Analysis
The TPE matrix has low water absorption, but polar grades and overmolding materials still absorb moisture; overmolding interface bubbles are mostly related to moisture; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
General TPE 80℃×2 hours; overmolding materials and TPU types must be dried; moisture content controlled at 0.1%; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPE drying is distinguished by grade type; overmolding material must be dried; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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