Extrusion & Post
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MP vacuum section material overflow
Problem Phenomenon
MP extrusion vacuum section material overflow, vent hole blocked
Cause Analysis
MP melt viscosity low, overflowing at the vacuum section; vacuum section temperature high, viscosity lower, aggravating overflow; vent hole design improper
Solution
1) lower vacuum section temperature 5-10°C to increase viscosity; 2) add a baffle above the vent hole to prevent overflow; 3) increase screw speed to accelerate conveyance and reduce residence
Key Takeaway
material overflow is caused by low melt viscosity; lowering temperature and adding a baffle are key
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