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Honeywell CS071AE User Manual

Portable evaporative air cooler
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Description of Problem
Blisters
Thinning
TROUBLE-SHOOTING GUIDE
Possible Causes
• Excessive moisture.
• Heating sheet too hot.
• Heating sheet too fast.
• Uneven heating of the sheet.
• Heat sensitive material.
• Design of the part.
• Sheet too thin.
• Uneven sheet temperature.
• Forming technique.
• Bad plastic sheet. Melt
index of sheet may be low.
Possible Corrective Action
• Pre-dry sheet at the temperature
required for the material you are
forming.
• Heat sheet very slowly to forming
temperature.
• Protect sheet from moisture before
using.
• Cut down sheet forming
temperature. You may be boiling
the stabilizers out of the material.
• Lower element temperatures.
Generally speaking, element
temperatures should not exceed
950° F.
• Increase the distance between the
heating elements and the sheet.
• Check forming oven for elements
that are overheating.
• Screen out hot spots.
• Check with plastic supplier on
temperature parameters for the
material involved.
• The overall draw ratio of the part is
too great for the starting thickness
of the sheet.
• The part has specific areas on it
that exceed the draw ratios of the
rest of the part.
• Increase the gauge thickness of the
plastic sheet.
• Check for air drafts in the forming
oven.
• Check for hot spots in the forming
oven. May have defective heating
elements.
• Check the sheet for a variation in
thickness.
• Consider where the part is thinning
and what forming technique would
best address this problem.
• Have physical properties of the
sheet analyzed.
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  Summary of Contents for Honeywell CS071AE

  • Page 1 TROUBLE-SHOOTING GUIDE Description of Problem Possible Causes Possible Corrective Action • Excessive moisture. • Pre-dry sheet at the temperature Blisters required for the material you are forming. • Heat sheet very slowly to forming temperature. • Protect sheet from moisture before using.
  • Page 2 TROUBLE-SHOOTING GUIDE Description of Problem Possible Causes Possible Corrective Action • Forming temperature too • Cut down on the forming Discoloration hot. temperature of the sheet. • Pigment loading too low. • Increase pigment loading. • Hot spots in forming oven. •...
  • Page 3 TROUBLE-SHOOTING GUIDE Description of Problem Possible Causes Possible Corrective Action • Selectively increase the size of the vacuum holes. • Timing the billow in the • Get a more sensitive flow valve. • Put an electric eye in the snapback snapback box.
  • Page 4 TROUBLE-SHOOTING GUIDE Description of Problem Possible Causes Possible Corrective Action • Texture too deep for starting • Select a different texture. Texture separation. thickness of the sheet. • Texture has deep furrow • Select a different texture. • The material you are using may lines in a pattern.
  • Page 5 TROUBLE-SHOOTING GUIDE Description of Problem Possible Causes Possible Corrective Action • Uneven heat on plastic • Check for air drafts in the heating Inconsistent part. sheet. oven. • Check the sheet for a variation in gauge. • Check for power output variations. •...
  • Page 6 TROUBLE-SHOOTING GUIDE Description of Problem Possible Causes Possible Corrective Action sagging too much. heat. • Poor mold design. • Add a moat if you are dealing with the olefins. • Check for plugged vacuum holes. • Add more vacuum holes. •...
  • Page 7 TROUBLE-SHOOTING GUIDE Description of Problem Possible Causes Possible Corrective Action material distribution and vacuum seal. • Hot strength of material too • Select a material with less hot great. strength. • Use pressure-forming technique to make the part. • Plastic too thick in area with •...
  • Page 8 TROUBLE-SHOOTING GUIDE Description of Problem Possible Causes Possible Corrective Action • Avoid dragging the corner of the sheet across the surface of the textured side. • Streaks. • Examine what you are cleaning the sheet with before putting it into the thermoformer.
  • Page 9 TROUBLE-SHOOTING GUIDE Description of Problem Possible Causes Possible Corrective Action • Reduce the temperature of the heaters to prevent surface scorching. • Reduce the distance the heaters are in relation to the sheet being heated. • Part too thin. • Increase the thickness of the sheet. •...
  • Page 10 TROUBLE-SHOOTING GUIDE Description of Problem Possible Causes Possible Corrective Action • Sheet too hot in certain • Control the heat in the hot zone of Shiny streaks on part. spots. the sheet by cutting down the element temperature in the specific area.
  • Page 11 TROUBLE-SHOOTING GUIDE Description of Problem Possible Causes Possible Corrective Action • Use mold release in areas that are locking on. • Air ejection pressure too low • Increase or extend air ejection or not long enough. pressure. • Add more vacuum holes in strategic places.
  • Page 12 TROUBLE-SHOOTING GUIDE Description of Problem Possible Causes Possible Corrective Action • Poor material distribution. • Check the sheet for uneven thickness. • Check for uneven heating. • Plug temperature is too hot. • Decrease the plug temperature. Plastic sheet sticks to the plug. •...
  • Page 13 TROUBLE-SHOOTING GUIDE Description of Problem Possible Causes Possible Corrective Action • Sheet too cold. • Increase heating time. Sheet whitening. • Increase heating element temperature. • Sheet stretched beyond the • Change the forming technique. • Redesign the part. yield point of the plastic. Part cracks during service life.
  • Page 14 TROUBLE-SHOOTING GUIDE Description of Problem Possible Causes Possible Corrective Action • Flat surface of the mold not • Check the mold for rigidity and Flat surface of a part not flat. properly reinforced. Oil durability. canning during the vacuum cycle. •...