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1.Reactive Brill Blue R - Economical & Best method of dye

There are so many methods of dyeing this particular dyestuff, time to time advised by eminent people in this industry, to achieve maximum colour yield and all round fastnesses.  But after a short while due to some change either in the quality or in the application technique, every dyeing master used to suffer from non-reproducibility of this particular dyestuff.  

One Mr.P.Arumugam, the dye house in-charge of M/s Suriya Textile Processor, Bhavani, Erode, has discovered his own unique new textile processing technique that can be tried by those  using Jiggers or short liquor ratio dyeing machines.

The new dyeing technique is very simple and almost a cold dyeing method. Here below he has given the details of the dyeing procedure.

After scouring and bleaching, neutralize the fabric thoroughly.

Dissolve and filter the dyestuff solution. Add the dye solution in to the machine in two installments.

At room temperature,

• Add 1/2 portion of Salt + 1/2 portion of soda ash - run 1 end.

• Add 1/2 portion of Salt + 1/2 portion of soda ash - run 1 end.

• Run 1/2 hour at room temperature.

• Add 1/2 portion of Caustic Soda - run 1 end.

• Add 1/2 portion of Caustic Soda - run 1 end.

• Raise temperature to 40°C, run 45 minutes and finish dyeing.

Recipe - for 4% depth of shade 

• Salt                        = 80 gms. /liter

• Soda                      = 10 gms./liter

• Caustic soda flakes = 1 gm. /liter 4

Do neutralization, soaping and washings as usual.

Remarks:

You will get improved rubbing and wash fastness properties in addition to an improvement of depth to about 20 to 30% than the normal dyed material.

If proper scouring and bleaching has not been done, there may be a possibility of getting surface dyeing with poor fastness properties.

2. Stripping of Optical Brighteners - the best method for

 jig processors

A simple OBA stripping technique  given below can be adopted in jiggers very efficiently and you can strip off almost 98% of  OBA.

Recipe and method of process flow  given below may be used as new hint..

a) Wetting the fabric:

Soap - 1 gm/liter, Soda ash 1 gm/liter - treat the fabric at 70°C for 30 minutes.

b) Oxidative Bleaching:

Potassium Permanganate (KMnO4) - 0.5% wof at cold for 30 minutes - to the same bath add Hydrochloric acid (35% conc.), 3 times the quantity of KMnO4 continue run for another 30 minutes. Then raise the temperature to 50°C and run for 30 minutes.

Drain the bath - cold wash - 30 minutes.

c) Reductive Bleaching:

Run 10 minutes with Caustic soda 5 gms/liter and then add 5 gms/liter of Hydros (Sodium Hydro Sulphite) at room temperature and run for 10 minutes. Then slowly raise the temperature to 60°C. During this process the brown coloration you have got  would be converted to light beige like shade. Now do one thorough cold wash.

4) Oxalic Acid Treatment:

Treat with 2 gms/liter of Oxalic acid at room temperature for 30 minutes or 2 ends followed by a cold wash.

5) Soda ash Neutralization:

                    Treat with 2 gms/liter of soda ash at room temperature for 30 minutes and again do a cold wash.

6) Acetic acid Neutralization:

                    Treat the fabric with 1 gm/liter of acetic acid for 10 minutes at cold. Check the pH and let it be 6.

Now you will wonder to see thorough removal of  OBA.