Extrusion & Post
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TPE Overmolding on Nylon Poor Adhesion
Problembeschreibung
TPE overmolded nylon products have weak interface bonding and delaminate easily.
Ursachenanalyse
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
Lösung
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.
Wichtigste Erkenntnis
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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