Monday, 15 June 2009

Defects in Dyeing with Reactive Dyes



Defects in Dyeing with Reactive Dyes

Defect: Colors are not fast to washing, Abrasion;Staining in the fabric when transporting from place to the other, water marks on the fabric

Remedy : Wash the fabric with soap and soda ash at right temperature. Adding sequestering agent will yield good results. Treating with Ammonia will also give good results.

Defects in the fabric due to Printing- Need to take out full color

Remedy: Treat the dyed fabric with Sodium Hydrosuphite with 5-10 gm Sodium Hydrosulphite at 75 deg C for 30-45 minutes. Add 5-7 gms Caustic Soda for even removal of colors. The color becomes light yellow or brown after removal. Wash it thoroughly with soap.

The color can also be removed by solution of Sodium Hypochlorite. Treat the fabric with a sodium hypochlorite solution ( 3-5 gms Chlorine) for 20-30 minutes. Keep the pH between 9-10. The fabric is treated with Acetic acid after removal of color to remove chlorine and to neutralise the fabric.

The fabric can be redyed after removal of color

Defect: Bleeding in colors during washing, abrasion

Remedy: Boil the fabric with caustic, Treat the fabric with Hydrogen Peroxide ( 5-10 gpl, 60-70 deg C) to make the color fast.


Defect: The fabric has been dyed in darker shade, uneven dyeing

Remedy: To take out color from the fabric treat it with caustic for 45-60 min at 70 deg C. Thereafter treat the fabric with 10-20 gpl Acetic Acid for 40-60 min at 80-85 deg C.

Defect: Uneven dyeing, marks of water, marks of colors

Remedy: Wash the fabric in soap and redye in a darker shade

Defect : The fabric has become stiff and rough after dyeing

Remedy: Finish after adding right softner

Defect: Color staining of fabric, uneven dyeing

Remedy: Redye the fabric in darker shade.

Defect: Color staining in fabrics of darker shade, uneven undyeing

Remedy: Dye the fabric in Sulphur black

Caution: Please treat a small length fabric to check the effectiveness and any harmful effects before commencing a full treatment.









1 comment:

vishwadeepak said...

we are facing heavy addition in yarn dyeing of 120/2 viscose rayon yarn.if u have the solution please mail at danmk07@gmail.com

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