Material Drying
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MP compression molded product bubbles
Problem Phenomenon
MP melamine tableware compression molded products have surface bubbles 0.5-2mm
Cause Analysis
preform powder contains moisture >0.5%; insufficient venting, air and volatiles in the mold cavity cannot escape
Solution
1) dry preform powder at 80°C for 2h to moisture <0.1%; 2) add vent grooves to the mold; 3) pre-press degassing 1-2 times to release volatiles
Key Takeaway
MP compression molding bubbles are caused by moisture and poor venting; drying and venting are key
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