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 Check that melt is well fused