Molds & Tooling
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PP Sink Mark in Thick Walls
Problembeschreibung
PP sink marks in thick walls and ribs, holding pressure and structural design, feeding management.
Ursachenanalyse
PP sink marks in thick wall areas; insufficient holding pressure; rib thickness management; gate position; uniform wall thickness; feeding channels.; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Lösung
①Increase holding pressure; ②rib thickness 50-60%; ③gate near thick walls; ④uniform wall thickness; ⑤structural design.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Wichtigste Erkenntnis
Holding pressure and structure are equally important for PP sink marks; rib design is prevention; gate position affects feeding.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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