Material Drying
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TPE Overmolding Material Must Be Pre-dried
Problem Phenomenon
Gas marks appear on the surface of TPE overmolded parts, bonding strength is insufficient, and the appearance is poor
Cause Analysis
When TPE is overmolded on hard plastics such as ABS, PC, and PA, residual moisture volatilizes during molding to form gas marks affecting appearance and bonding; the overmolding material must be pre-dried at 80℃×2-4 hours
Solution
①Pre-dry overmolding TPE at 80℃×2-4 hours; ②The hard plastic substrate is also pre-dried; ③Match material temperature before overmolding; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Pre-drying of TPE overmolding is the prerequisite for bonding quality; 80℃×2-4h is a fixed process for overmolding material; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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