Injection Molding
4 views
POE '2079851475616104452 sink marks
Problem Phenomenon
POE injection molded product thick-wall areas show surface depression 0.2-0.5mm sink marks
Cause Analysis
Holding pressure insufficient or holding time short; gate freezes too early, holding pressure cannot be transmitted; wall thickness difference large, after thin wall freezes the thick wall cannot be refilled
Solution
1) Increase holding pressure 70-90MPa; 2) Extend holding to gate freezing +2s; 3) Product design to reduce wall thickness difference with gradual transition; 4) Add supplementary gates in thick-wall areas
Key Takeaway
Sink marks are caused by insufficient holding and wall thickness difference; high-pressure holding and multiple gates are core countermeasures
Was this helpful?
0 people found this helpful
Thank you for your feedback!