|
Cause
|
Comments
|
Recommendations
|
Location
|
| Poor solvent flow rate |
Allows insoluble particulate soils to redeposit on fabrics |
See Poor Cleaning |
|
| High solvent relative humidity |
Graying will increase as water content is raised |
Reduce the moisture content of the solvent by running 2 or 4 loads of pre-dried cotton towels through cleaning cycle. |
Rinse solvent
|
| Overloaded machine |
Can cause increase in redeposition |
Load only to capacity. If little improvement is seen, underload by 25%. |
|
| Carbon leakage |
Insufficient or improperly applied precoat. Check filter for holes. Check for defective cartridge. |
Circulate solvent inventory through repaired and properly coated filter elements. Replace cartridge. |
|
| Too high a solvent level in wash wheel |
Batch operations usually worsen the problem |
Use a low or medium solvent for most fabrics |
|
| The nature of the fiber |
Cotton, acrilan, and polyester/cotton blends present the greatest problems |
Wool, orlon/nylon blends, and silk may be cleaned with the least risk of graying
|
|
| Use of a detergent |
The anti-redeposition properties of detergents vary with the detergent |
Use a detergent or charged solvent with proven anti-redeposition properties |
|
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