Injection Molding
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TPE Overmolding Thickness Design
Problem Phenomenon
TPE overmolding layer too thin gives low bonding strength, too thick causes shrinkage and bubbles, with poor feel
Cause Analysis
TPE overmolding layer thickness of 1.5-3.0mm gives the best bonding effect; too thin makes injection difficult with low bonding strength and poor feel; too thick is costly and prone to shrinkage and bubbles
Solution
①Design the overmolding layer thickness at 1.5-3.0mm; ②Uniform wall thickness; ③Gradual thick-to-thin transitions; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPE overmolding thickness has a clear window; 1.5-3.0mm is the best balance of bonding, feel, and cost; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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