DYEING PROCEDURE

                                                                      Contd... from Page 3


Fixation:

One Phase Printing, the printed and dried fabric is steamed with saturated steam at 103⁰C for 10 to 15 Min. in a star agar or 5 to 7 minutes in continuous steamer.

Two Phase Printing, the printed and dried fabric is passed through a hot fixation bath, which is maintained at 95⁰ to 100⁰C, preferably with indirect heating arrangement to avoid dilution of the liquor.

The Fixation bath consists : 

A	200 gms/liter Glauber's Salt 150 gms/liter Soda Ash 50 gms/liter Potash 25-30 gms/liter Caustic Soda (Solid) For fixation of the prints, 5-12 seconds are enough. The prints are washed immediately after fixation without any air passage.
B	The printed and dried fabric nips slop padded with 480 To 520. Sodium Silicate solution containing 4 - 6 cc/l Caustic Soda 320. The batch is well covered with plastic sheet and allowed to dwell for 16 - 20 hours. Then follow other treatment as mentioned earlier.

Washing procedure

To optimize wet-fastness properties, brightness and purity of shades with consistent dyeing results, essential to give a thorough `Soaping' to clear off un-reacted hydrolyzed dye from the dyed fabric.

The dyed fabric is rinsed repeatedly in cold water to remove most of the alkali, salt and unfixed dye present and rinse again in warm water not higher than 60⁰C. Then run in a bath containing.

 
Anionic detergent - 1 -2 gms/liter for 15 minutes at the boil. Then rinse in warm water (up to 60⁰C) and finally in cold water. The most effected Washing-off, particularly for piece goods, are obtained by employing an Open soaper or perforated Beam-washing machine. If such equipments are not available, conventional ones like Jig or Winch may be used. For yarn is the Hank form open - vat is employed and for yarn in packaged form the package-dyeing machine itself used.