Molds & Tooling
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TPE flow marks and uneven gloss
Problem Phenomenon
Stripes of different gloss appear on the product surface, especially near the gate
Cause Analysis
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
Solution
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
Key Takeaway
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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