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MP extrusion rough surface

Problem Phenomenon

MP extruded product surface roughness Ra>5μm, exceeding the requirement

Cause Analysis

extrusion temperature low <150°C, melt flow unstable; die inner wall rough or damaged; MP melt elasticity, extrusion swell uneven

Solution

1) raise extrusion temperature to 150-170°C; 2) polish die inner wall Ra<0.4μm; 3) reduce extrusion rate 10-15%; 4) add 0.3-0.5wt% external lubricant

Key Takeaway

rough surface is caused by low-temperature extrusion and die defects; raising temperature and polishing the die are the core countermeasures

MP extrusion rough surface die polishing extrusion temperature melt elasticity

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