How to fix vent-overflow problems on twin screw extruder?

The reasons of vent-overflow: 1. Too low temperature or too high pressure on die head.2.Too low MI provents melt flow fluently 3.Screw assembly is not correct,Insufficient pressure built in front of exhaust port 4.Feeding too fast 4.Material have much substance with low boiling point, such as water. 6.Improper temperature setting,materials not fully plasticized when reaches to vent.7.Screen changer blocked producing high pressure on die head

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