Fig: Different dyeing faults
Dyeing Faults, Causes and Their Remedies:
Here we are representing a lot less than the regimen faults or defects, causes of these faults and their treatments by bringing up pre-capsules stage and dyeing stage:
A. Pre-capsules stage:
1. Single marks:
Causes of unmarried marks:
An area internal the cotton supplies now not competently singed thanks to crease formation, this area will appear in darker shades after dyeing.
Remedies of unmarried marks:
Resingeing,
Color stripping and
Then re-dyeing.
2. Bad singeing:
Causes of terrible singeing:
Non uniform singeing thanks to blocking of some flame orifices. This will appear as darker places when dyed or revealed.
Remedies of terrible singeing:
Resingeing after making flame orifices as precise,
Color stripping and
Then re-dyeing.
3. Draft stains:
Causes of draft stains:
Yellow stains on the white cloth. This is thanks to wet cloth being left for incredibly longer duration of time after bleaching and earlier to dyeing. If the cloth is dyed, revealed or finished, it is going to have stains of deeper color shades.
Remedies of draft stains:
Acidifying the cloth, then washing it speedier than dyeing.
4. Rope marks:
Causes of rope marks:
Frequent longitudinal folds in cloth. This thanks to high stress all the style through mangling, when scouring of and bleaching is completed in rope from.
Remedies of rope marks:
Stentering the cloth speedier than dyeing. In case of extremely important folds it actually is really beneficial to mercerize the cloth.
5. Stains:
Causes of Stains:
Oil, stains, grease stains, rust, water spot and flooring stains.
Remedies of stains:
Suitable clearing agent for use.
Emulsifiers in case of oil and grease stains, oxalic acid, in case of iron rust and use suitable detergent in case of other stains.
6. Weak or soft places:
Causes of vulnerable or soft places:
Area of faded color in dyed cloth these are tendered thanks to chemical degradation all the style through bleaching.
Remedies of vulnerable or soft places:
Can now not be repaired in case of acute tendering. In gentle circumstances the cloth also can also well also be made extra by boiling in caustic soda salt and re-dyed.
B. Dyeing stage:
1. Dye stains:
Causes of dye stains:
Darker spots of an analogous color thanks to incomplete dissolution of the dye.
Remedies of dye stains:
In case of an instantaneous dye, trent in a boiling leveling tub. Stripping the color and re-dyeing in case of vat and quick hues. Adding also leveling agents.
2. Dark selvedges:
Causes of dark selvedges:
Darker color with regards to to selvedges thanks to non uniform winding of the cloth even though working on jiggers.
Remedies of dark selvedges:
Stripping of color, dyeing & re-dyeing and preferably suited beaming should be implemented.
3. Dark selvedges and brenzing:
Causes of dark selvedges and brenzing:
This takes position with vat and sulfur dyeing thanks to un precise winding or dyeing in open jiggers that are subjected to a draft of air.
Remedies of dark selvedges and brenzing:
Stripping of color, dyeing & re-dyeing and preferably suited beaming should be implemented.
4. Dye mottling:
Causes of dye mottling:
Unleveled dyeing thanks to error internal the dyeing processes or concentrations used.
Remedies of dye mottling:
Stripping or reducing the dye and re-oxidizing it. The color should be adjusted by shading.
5. Sided dyeing:
Causes of Sided dyeing:
Different color depths on the facets. This is on the whole thanks to unequal pressures on the dye mangle in continuous dyeing.
Remedies of Sided dyeing:
Stripping of the color and re-dyeing after precise movement on unequal dye mangle of continuous dyeing.
6. Specky dyeing:
Causes of Specky dyeing:
Surface of the dyed supplies has darker dyed spots. This is thanks to using dye stuff brands of excellent particle length particularly in pigmentation dyeing of vat hues.
Remedies of Specky dyeing:
The cloth should be boiled, color then stripped.
Use of vat hues of enormously dispersed brands in re-dyeing is really beneficial.
7. Color migration:
Causes of Color migration:
Difference in color depth from one facet of the supplies to each other. Also alternate in shades of one face of the cloth from each other. This is on the whole thanks to un-identical drying of every unmarried faces of cloth.
Remedies of Color migration:
Color to be partially stripped and re-dyed.
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