Honeywell CS071AE User Manual page 10

Description of Problem
Shiny streaks on part.
Thin corners on the formed
part.
Excessive shrinkage after part
is removed from the mold.
Shrink marks on formed part.
Difficult to remove part off
the mold.
TROUBLE-SHOOTING GUIDE
Possible Causes
• Sheet too hot in certain
spots.
• Sheet too thin.
• Poor material distribution.
• Sheet temperature too high
at the corners.
• Inadequate cooling.
• Poor seal edge on the mold.
• Mold surface too smooth.
• Inadequate vacuum.
• Insufficient draft on a male
mold.
• Male mold temperature too
cold.
• Mold surface too rough for
the draft angle.
Possible Corrective Action
• Control the heat in the hot zone of
the sheet by cutting down the
element temperature in the specific
area.
• Increase the distance between the
heater and the sheet.
• Screen the entire oven to dissipate
the heat more evenly.
• Check the unformed plastic sheet
for shiny spots.
• Use heavier gauged sheet.
• Reduce sheet forming temperature.
• Change forming technique to get
better sheet distribution.
• Change from female to male mold.
• Use screening or control the
temperature of the heating zones.
• Increase cooling cycle time.
• Reduce the mold temperature.
• Employ better cooling fans.
• Place cooling fans in more logistic
places.
• Use cooling fixtures.
• Repair or improve the seal edge.
• Put in a moat on the mold.
• Put as sandblast finish on the mold.
• Check mold and vacuum system
for leaks.
• Increase vacuum capacity.
• Check for plugged vacuum holes.
• Add vacuum holes or increase the
size as appropriate.
• Increase draft.
• Remove the part from the mold as
hot as possible without warping it.
• Increase the mold temperature to
keep the part from cooling too
much.
• Smooth out the mold in the areas
that are locking on.
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