Extrusion & Post
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TPE Overmolding on Nylon Poor Adhesion
Fenómeno del problema
TPE overmolded nylon products have weak interface bonding and delaminate easily.
Análisis de la causa
Nylon is highly polar and has poor compatibility with conventional non-polar TPE, making it difficult to form effective bonding at the interface.; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based solely on experience
Solución
①Select modified TPE special grades grafted with polar functional groups; ②spray single-component primer on the nylon surface for bridging; ③plasma treatment to improve surface activity; ④jointly develop and test formulations with the supplier.
Conclusión clave
Overmolding nylon is a technical difficulty for TPE bonding; three paths of modified grades, primer and plasma treatment, with joint development being the best solution.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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