Material Drying 7 visualizações

Internal voids of PU

Fenómeno do problema

1-3mm voids appear inside PU products, concentrated in the thick-wall center

Análise das causas

Insufficient holding, thick-wall center not compacted; gas entrapped and cannot be discharged; raw material moisture vaporized

Solução

1) Increase holding pressure to 60-80MPa for full compaction; 2) Increase mold venting; 3) Fully dry raw material

Conclusão principal

Internal voids are caused by insufficient holding and gas entrapment; high-pressure holding and venting are key

PU internal voids holding pressure mold venting raw '2079851475616104451

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