Friday, May 18, 2012
Dyeing Faults
Major dyeing faults which occur during are mentioned below:
Major dyeing faults which occur during are mentioned below:
- Uneven Dyeing
- Batch to Batch Shade variation
- Patchy dyeing effect
- Roll to roll variation or Meter to Meter variation
- Crease mark
- Dye spot
- Wrinkle mark
- Softener Mark
Uneven Dyeing:
Causes:
- Uneven pretreatment (uneven scouring & bleaching).
- Improper color dosing.
- Using dyes of high fixation property.
- Uneven heat-setting in case of synthetic fibers.
- Lack of control on dyeing m/c
Remedies:
- By ensuring even pretreatment.
- By ensuring even heat-setting in case of synthetic fibers.
- Proper dosing of dyes and chemicals.
- Proper controlling of dyeing m/c
Batch to Batch Shade Variation:
Causes:
- Fluctuation of Temperature.
- Improper dosing time of dyes & chemicals.
- Batch to batch weight variation of dyes and chemicals.
- Dyes lot variation.
- Improper reel speed, pump speed, liquor ratio.
- Improper pretreatment.
Remedies:
- Use standard dyes and chemicals.
- Maintain the same liquor ratio.
- Follow the standard pretreatment procedure.
- Maintain the same dyeing cycle.
- Identical dyeing procedure should be followed for the same depth of the Shade.
- Make sure that the operators add the right bulk chemicals at the same time and temperature in the process.
- The pH, hardness and sodium carbonate content of supply water should check daily.
Patchy Dyeing Effect:
Causes:
- Entanglement of fabric.
- Faulty injection of alkali.
- Improper addition of color.
- Due to hardness of water.
- Due to improper salt addition.
- Dye migration during intermediate dyeing.
- Uneven heat in the machine, etc.
Remedies:
- By ensuring proper pretreatment.
- Proper dosing of dyes and chemicals.
- Heat should be same throughout the dye liquor.
- Proper salt addition.
Roll to Roll Variation or Meter to Meter Variation:
Causes:
- Poor migration property of dyes.
- Improper dyes solubility.
- Hardness of water.
- Faulty m/c speed, etc
Remedies:
- Use standard dyes and chemicals.
- Proper m/c speed.
- Use of soft water.
Crease Mark:
Causes:
- Poor opening of the fabric rope
- Shock cooling of synthetic material
- If pump pressure & reel speed is not equal
- Due to high speed m/c running
Remedies:
- Maintaining proper reel sped & pump speed.
- Lower rate rising and cooling the temperature
- Reducing the m/c load
- Higher liquor ratio
Dye Spot:
Causes:
- Improper Dissolving of dye particle in bath.
- Improper Dissolving of caustic soda particle in bath.
Remedies:
- By proper dissolving of dyes & chemicals
- By passing the dissolved dyestuff through a fine stainless steel mesh strainer, so that the large un-dissolved particles are removed.
Wrinkle Mark:
Causes:
- Poor opening of the fabric rope
- Shock cooling of synthetic material
- High temperature entanglement of the fabric
Remedies:
- Maintaining proper reel sped & pump speed.
- Lower rate rising and cooling the temperature
- Higher liquor ratio
Softener Mark:
Causes:
- Improper mixing of the Softener.
- Improper running time of the fabric during application of softener.
- Entanglement of the fabric during application of softener
Remedies:
- Maintaining proper reel sped & pump speed.
- Proper Mixing of the softener before addition.
- Prevent the entanglement of the fabric during application of softener
Label :
defects
5
Textile Technology: Dyeing Faults and Remedies | Common Problems in Dyeing and Their
Remedies
Dyeing Faults Major dyeing faults which occur during are mentioned below: Uneven Dyeing Batch to Batch Shade variation Patchy dyeing effec...
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