Material Drying
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DSTDP processing moisture causing silver streaks
Fenómeno do problema
DSTDP injection molded product surface shows white silver streak marks
Análise das causas
Raw material moisture >0.05% vaporizes during high-temperature processing forming bubbles that are stretched into silver streaks; insufficient drying or hopper condensed moisture
Solução
1) Dry raw material at 80°C for 3-4h to moisture <0.02%; 2) increase back pressure 0.5-1MPa for venting; 3) reduce injection speed to avoid air entrainment; 4) heat the hopper to prevent condensed moisture
Conclusão principal
Silver streaks are caused by moisture vaporization and stretching; drying and venting are the main countermeasures
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