Testing of Vinyl sulphone/ Mono-chlorotriazine Dyestuffs by print strike off method

Although a comparative exhaust dyeing method is always recommended for comparing two samples of dyestuffs, people in printing industry prefer to make strike off prints to compare the standard and sample.

Print Paste preparation for strike off:

Materials used	Vinyl Sulphone dyes	H/P type of dyes
Dyestuff	40 grams	40 grams
3-4% Sodium Alginate gel	720 grams	720 grams
Sodium Bicarbonate	30 grams	20 grams
Soda Ash	---	15 grams
Resist Salt	10 grams	10 grams
Urea	100 grams	100 grams
Water	100 grams	95 grams
Total	1000 grams	1000 grams

 

Method of printing:

On a well mounted RFD fabric on printing table, using the above paste prepared separately for standard and sample, two strikes off would be printed with the test screens.

After the print, gets dried properly, the fabric will be passed through saturated steam chamber (in a Star Ager) at 105⁰C for 10-15 minutes or dry curing chamber at 150⁰C for 4 to 5 minutes. This is followed by hot wash, cold wash, neutralization with acetic acid 2gpl and 2 soaping, hot and cold washes.

Final pH is set at 6 by doing an acetic acid treatment at the end of all washings.