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The wire surface has fairy and bubble, or the extruded cross-section has bubble?

Reffer:Editor:Author:Hits:-InputTime:2013-03-22 15:53:00

      The wire surface has fairy and bubble, or the extruded cross-section has bubble?

The main causes:
The Material is moisture;
The set temperature is too high or poor temperature control;
The screw compression ratio is too large, the shear heat is too high;

Proposed measures:

If the material is placed too long, it should be pre-dried before use; reasonable set of processing temperature, lower the temperature of the body and die, should strengthen inspection whether the heating and the cooling system is working properly, during the extrusion process; reduce the screw speed, or even to replace it with the low compression ratio screw.