Molds & Tooling
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LCP Jetting Marks and Surface Flow Marks
Problembeschreibung
【Problem Phenomenon】Snake-shaped jetting marks or wavy flow marks appear near the gate, and the product surface gloss is uneven
Ursachenanalyse
The melt jets directly into the cavity through a small gate at high speed without contacting the mold wall, and the front folds to form jetting marks; when the mold temperature is low, the front's solidified film breaks and flow marks appear; Celanese troubleshooting lists a special item on jetting and surface flow marks
Lösung
Raise the mold temperature and gate area temperature, and use lap or fan gates to make the melt fill against the wall; reduce the initial speed through the gate, and if necessary arrange the gate to impinge on the core
Wichtigste Erkenntnis
Jetting and flow marks are fundamentally cured by gate design and wall-contact filling; raising temperature is only auxiliary; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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