Honeywell CS071AE User Manual page 13

Description of Problem
Sheet whitening.
Part cracks during service life. • Part too thin in specific
Parts are brittle.
TROUBLE-SHOOTING GUIDE
Possible Causes
• Sheet too cold.
• Sheet stretched beyond the
yield point of the plastic.
areas.
• Poor part design.
• Part formed too cold and is
not stress relieved.
• Part not assembled properly
or fastened to other
structures improperly.
• Poor selection of materials.
• Improper cooling
temperature on the mold.
• Plastic heated too hot too
quickly.
• Mold lubricant incompatible
with the plastic being used.
• Part cleaned with a harmful
chemical during packaging.
Possible Corrective Action
• Increase heating time.
• Increase heating element
temperature.
• Change the forming technique.
• Redesign the part.
• Increase sheet thickness.
• Use plug assists to distribute
material more efficiently.
• Fill in the thin areas in the back of
the part with epoxy resins.
• Consider changing forming
technique.
• Consider changing part design.
• Increase the radii on the sharp areas
of the part.
• Increase forming temperature of
the part.
• Check assembly technique to see if
it commensurate with good
assembly practices.
• Check to see if the physical
properties of the material selected
are adequate for the part produced.
• Check to see if the mold is too
cold. Increase mold temperature.
• Check to see if the cooling on the
mold is too abrupt, that is,
excessive spray misting.
• Check for charring of the surface
of the plastic and turn down the
heating element temperature.
• Change mold lubricant.
• Check cleaning agents you are
using.
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