Material Drying
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Glass Fibre '2079851475616104452 thick-wall bubbles
Problem Phenomenon
Glass Fibre injection molded thick-wall product has dense bubbles 0.1-0.5mm inside, concentrated at 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) Raise holding pressure to 60-80MPa; 2) extend holding time to fully compact thick wall; 3) fully dry raw material to moisture <0.02%; 4) add vent grooves or vent pins to mold; 5) gradually decelerating injection to avoid air entrainment
Key Takeaway
Thick-wall bubbles are comprehensively caused by insufficient holding pressure, moisture and poor venting
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