Extrusion & Post
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DSTDP vacuum vent section material overflow
Problem Phenomenon
DSTDP extrusion vacuum vent section material overflow, vent hole clogged
Cause Analysis
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
Solution
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
Key Takeaway
Material overflow is caused by low melt viscosity; temperature reduction and baffle are key
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