Injection Molding
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TPE Overmolding on ABS Cracking
Problem Phenomenon
In TPE overmolded ABS products, the soft rubber layer cracks during use, with cracks appearing within hours or days after molding.
Cause Analysis
TPE material physical properties (tensile, tear resistance) are insufficient; stress cracking occurs due to stress during molding; material aging resistance is insufficient and aging cracking occurs after outdoor use.
Solution
①Select TPE grades with excellent physical properties; ②strengthen cooling and holding pressure to release stress; ③supplier improves TPE aging resistance; ④provide the sample to the supplier to analyze the crux.
Key Takeaway
Overmolding cracking must be analyzed from both material physical properties and molding stress; when judgment is impossible, providing the problem sample to the raw material supplier for collaborative analysis is an efficient path.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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