Honeywell CS071AE User Manual page 3

Description of Problem
Sheet pulls out of clamp
frame.
Lumps and bumps.
Texture washout.
TROUBLE-SHOOTING GUIDE
Possible Causes
• Timing the billow in the
snapback box.
• Clamp frames warped.
• Clamping pressure too low.
• High shrinkage in plastic
sheet.
• Contamination in the sheet.
• Incompatible plastic mixed
within the sheet.
• Water droplets on hot plastic
sheet.
• Bump on the mold.
• Loose debris on the mold.
• Draw ratio of the part too
great.
• Plastic sheet heated too hot,
especially on the texture
side.
Possible Corrective Action
• Selectively increase the size of the
vacuum holes.
• Get a more sensitive flow valve.
• Put an electric eye in the snapback
box.
• Put a piece of paper in the clamp
frame and see if you can pull it out
without tearing it.
• Seals leaking on clamp frames.
• Air pressure to clamp frames
adjusted to low.
• Put double-sided adhesive foam
tape with 40-grit emery paper on
the clamp frames.
• If possible, control the orientation
in the plastic sheet.
• Cut a cross section of the lump and
examine it to see if looks different
than the plastic matrix. If so, it is
an extruder issue.
• Check incompatible lump with an
IR test.
• Compare color of lump with the
rest of the matrix.
• Cut a cross section of the lump and
check for compatibility.
• Look for a depression on the side
of the sheet touching the mold.
• Look at the back of the formed part
for loose debris imbedded within
the part.
• Consider a deeper texture.
• Turn down the texture side heaters
in the oven.
• Cut down the heater cycle time.
• Cut down the overall heat on the
sheet.
• Shade out certain areas of the sheet
to keep it cooler and less
susceptible to thinning.
88