Injection Molding
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PETG and elastomer overmolding poor bonding
Problem Phenomenon
When overmolding TPE/TPU elastomer onto a rigid substrate, the bonding force is insufficient.
Cause Analysis
The substrate surface cools quickly and wets poorly, the materials are incompatible, and the substrate surface is untreated.
Solution
Plasma or primer pretreatment of the substrate surface; increase the overmolding material temperature; select a compatible elastomer.
Key Takeaway
PETG overmolding requires substrate pretreatment and material selection.
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