Honeywell CS071AE User Manual page 14

Description of Problem
Flat surface of a part not flat.
Furrows or lines in the part.
Plastic tears during heating or
forming.
TROUBLE-SHOOTING GUIDE
Possible Causes
• Flat surface of the mold not
properly reinforced. Oil
canning during the vacuum
cycle.
• Die lines in the plastic.
• Poor hot strength in the
plastic.
• Plastic is partially burnt
during the extrusion
operation.
• High orientation in the
sheet.
• Mixed regrind in the sheet.
• Grain texture too deep for
the thickness of the sheet
being used.
Possible Corrective Action
• Check the mold for rigidity and
durability.
• Rerun the plastic sheet.
• Form the plastic at a cooler
temperature.
• Select a more appropriate plastic.
• Test the material to see if the
viscosity is OK. Rerun with good
material if necessary.
• Rerun with the proper orientation.
• Use only regrind that is compatible
with the virgin part of the sheet.
• Use good quality regrind.
• Select a texture that will not
separate during the heating cycle.
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