Material Drying
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MP '2079851475616104452 thick-wall bubbles
Problem Phenomenon
MP injection molded thick-wall products have dense bubbles 0.1-0.5mm inside, concentrated at the wall thickness center
Cause Analysis
holding pressure insufficient <40MPa or holding time short, thick-wall center not compacted; raw material contains moisture; injection speed too fast entrains air; mold venting poor
Solution
1) increase holding pressure to 60-80MPa; 2) extend holding time to fully compact thick walls; 3) fully dry raw material to moisture <0.02%; 4) add vent grooves or vent pins to the mold; 5) gradually decelerate injection to avoid air entrapment
Key Takeaway
thick-wall bubbles are caused by a combination of insufficient holding, moisture and poor venting
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