Molds & Tooling
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TPE flow marks and uneven gloss
Fenómeno del problema
Stripes of different gloss appear on the product surface, especially near the gate
Análisis de la causa
Three types of TPE flow marks: narrow-interval record-like, wide-interval same-phase, and wide-interval different-phase; the flow speed of the end is slower than the skin, low-temperature resin blocks the gate, and the end flow is scattered
Solución
①increase injection speed, mold temperature, and molding temperature; ②enlarge the gate and increase injection speed; ③increase temperature and reduce injection speed; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
TPE flow marks are treated by type; for narrow marks increase speed and temperature, for wide marks enlarge the gate, for different-phase marks increase temperature and reduce speed; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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