Material Drying
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Glass Fibre internal voids
Problem Phenomenon
Glass Fibre products have 1-3mm voids inside, concentrated at the thick-wall center
Cause Analysis
insufficient holding, thick-wall center not compacted; gas entrapment cannot be vented; moisture in raw material vaporizes
Solution
1) increase holding pressure 60-80MPa for full compaction; 2) increase mold venting; 3) fully dry the raw material
Key Takeaway
internal voids are caused by insufficient holding and gas entrapment; high holding pressure and venting are key
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