Molds & Tooling
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PP Sink Mark in Thick Walls
Problem Phenomenon
PP sink marks in thick walls and ribs, holding pressure and structural design, feeding management.
Cause Analysis
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
Solution
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
Key Takeaway
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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