Extrusion & Post
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CEF vacuum section material spitting
Problem Phenomenon
The CEF extrusion vacuum section spits material and the vent hole is blocked
Cause Analysis
The CEF melt viscosity is low and overflows in the vacuum section; the vacuum section temperature is high and the viscosity is lower, aggravating the spitting; the vent hole design is improper
Solution
1) Reduce the vacuum section temperature by 5-10°C to increase the viscosity; 2) Add a baffle above the vent hole to prevent spitting; 3) Increase the screw speed to accelerate pushing and reduce residence time
Key Takeaway
Material spitting is caused by low melt viscosity; reducing temperature and adding a baffle are the key
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