'Some of the vat printing process for overprint and brasso print method- A case study'
When ever overall fastness is required in dyeing and printing method for cotton area always vat dye is preferred first. In market it is available as a powder form and paste form also. Vat dye can be classified commercially from its particle size powder form; acra com form and micro disperse form.
Now a days commercially vat paste is used in printing method .In vat printing we are going to discuss their printing process in rotary printing machine along with some popular shade like military khaki ,brasso print etc.
In Brasso paste high concentration of acid liberating is used to remove celluloses portion from polyester cotton blend fabric.
Rotary printing machine:-Here we are going to discuss vat overprint process on vat dyed ground. For standard cutting see scanned photo of khaki print (figure: Case I).
Construction:-warp*weft=14 *10 count.
Reed * pick=4/46*48
Grey width=155 cm
Process:-overprint on vat dyed khaki ground.
Order:-Government military khaki dress.
Machine used:-rotary printing machine.
Speed =18 meter/minute.
Colour screen used=2
Magnetic rod size used=20 mm.
Colour =Brown paste and olive green paste.
Repeat of screen=640 mm.
Screen mesh size=130 mesh per inch square.
Gum paste (Gum indalca):-
Gum (7%) =Rest% 100 kg
Olive green solution:-
Vat olive green FFB (Paste) =52 kg.
Hot water=52 kg.
Total=1800 kg (For 20,000 meter fabric)
Vat brown RRD (paste) =130 kg.
Total=1400 kg (for 20,000 meter fabric)
Process: Print drysteaming at 105-110 degree Celsius holding time 15 minutes---washing in open width washing machine---drying and finishing.