Extrusion & Post
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DSTDP vacuum vent section material overflow
Fenómeno do problema
DSTDP extrusion vacuum vent section material overflow, vent hole clogged
Análise das causas
DSTDP melt viscosity low, overflowing at the vacuum vent section; vacuum vent section temperature on the high side, viscosity even lower, aggravating overflow; vent hole design improper
Solução
1) Lower vacuum vent section temperature 5-10°C to increase viscosity; 2) add baffle above the vent hole to prevent overflow; 3) increase screw speed to accelerate conveying and reduce residence
Conclusão principal
Material overflow is caused by low melt viscosity; temperature reduction and baffle are key
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