Honeywell CS071AE User Manual page 4

Description of Problem
Texture separation.
Sheet won't fit into clamp
frame.
Flow lines on part.
Blotchy look on the texture
side of amorphous materials.
Blotchy look on the texture
side of olefin materials.
TROUBLE-SHOOTING GUIDE
Possible Causes
• Texture too deep for starting
thickness of the sheet.
• Texture has deep furrow
lines in a pattern.
• Draw ratio pretty large, in
excess of 3 to 1.
• Sheet not flat.
• Nerve in the plastic sheet.
• Chatter due to sloppy chain
drive on the extruder.
• Melt index of resin erratic.
• Die lines on the back of the
sheet.
• Excessive heat, especially
on PVC containing
materials.
• High oven shrinkage.
• Poor mold contact.
• Uneven cooling on the mold
Possible Corrective Action
• Select a different texture.
• Select a different texture.
• The material you are using may
have poor hot strength and you
may need to select a different one.
• Excessive shrinkage in the
extruded sheet.
• Select a tighter texture.
• Change the processing technique
for forming the part.
• Place a weight on the bowed up
area along the clamp frame.
• Preheat sheet to remove stress.
• Rerun the sheet.
• Run material on a good direct drive
extruder.
• Select a deeper texture.
• Blend resin more thoroughly.
• Rerun sheet.
• Run sheet from the oven at a lower
temperature.
• Select a deeper texture.
• Cut down the forming temperature
heat.
• Select a better texture. Some hair
cell textures will do this in PVC
containing materials.
• Check shrinkage and keep within
acceptable limits.
• Sandblast mold surface.
• Get a temperature-controlled mold.
• Check cooling lines for blockages.
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