Profile Extrusion Troubleshooting

Problems Suggested Solutions Pitting or Foaming Further drying is required Rough Appearance Check that proper screw is installed Too Glossy Reduce screw speed Reduce barrel temperature Check that proper screw is installed Surging Reduce screw speed Eliminate screw cooling Dimensional Variation Reduce screw speed Black specks, Burning Check temperatures Check quality and material of construction for surfaces in contact with melt Check for streamlined, low inventory die/adapter Clean out all burned or foreign material from die, adapter, and extruder Check that proper screw is installed Poor Impact and Physical Properties Check stock temperatures