Extrusion & Post
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TPE Overmolding Poor Bonding and Peeling
Problem Phenomenon
TPE soft rubber peels and delaminates from the surface of hard rubber such as ABS, bonding force test fails.
Cause Analysis
During overmolding, TPE injection temperature is too low, affecting the fusion bonding effect with the hard rubber; substrate surface contamination or poor compatibility between TPE grade and substrate also causes peeling.
Solution
①Appropriately raise TPE injection temperature to promote bonding; ②clean the substrate surface; ③select overmolding-specific TPE grades compatible with the substrate; ④optimize mold temperature.
Key Takeaway
The primary process cause of poor bonding is low temperature; material compatibility is the premise at the selection level, with temperature and grade applied together.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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