Honeywell CS071AE User Manual page 8

Description of Problem
Chill marks.
Dimples on mold side of parts.
Color loss or stress whitening
or blushing.
TROUBLE-SHOOTING GUIDE
Possible Causes
• Streaks.
• Dust and dirt in the
atmosphere.
• Mold temperature too low.
Material freezes onto the
mold when it touches it.
• The radius on the part is too
small.
• Wrong forming technique is
being used.
• Insufficient draft angle on
the part.
• Plug temperature too low.
• Sheet too hot.
• Vacuum holes too large.
• Sheet too hot.
• Dirt or debris on the mold
surfaces.
• Vacuum rate is too high.
• Sheet too cold.
• Sheet too hot.
Possible Corrective Action
• Avoid dragging the corner of the
sheet across the surface of the
textured side.
• Examine what you are cleaning the
sheet with before putting it into the
thermoformer.
• Undispersed pigment in the sheet.
• Poor mixing during extrusion.
Rerun the material.
• Dirty embossing roll during the
extrusion process. Clean the
texture roll.
• Keep the thermoforming area
clean. Put in a filter system if
necessary.
• Increase the mold temperature.
• Redesign the part to accommodate
a larger radius.
• Change the forming technique to
an appropriate one.
• Increase the draft angle.
• Increase the plug temperature.
• Cover the plug with an insulative
material.
• Use an insulating material to make
the plug.
• Cut down the oven temperature.
• Reduce the heating cycle.
• Decrease vacuum-hole size.
• Reduce the heating cycle or cut
down the oven temperature.
• Clean the mold frequently during
the forming operation.
• Cut down the vacuum volume.
• Heat sheet to a higher temperature
before forming.
• Cut back on heating cycle to
prevent discoloration.
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