Summer trainning@ WEAVERS CENTER

From 15 june -15 july

Dying and printing

Weaving

Designing

DYING AND PRINTING

Yarn dying

With REACTIVE dyes

VAT dyes

And MIXED dyes

Fabric dying

Single colour

Tie and dye

And different types of printing

Screan printing

Block printing

Hand printing

Yarn dying

Process of dying

1. Scouring : removal of wax Chemical used = castic soda + weting

agent + soda ash

at water temperature 80*C for atleast 30 minutes

And for neutralizing the alkali we do acetic wash

Formula of scouring Weight of yarn x % of shade (ml)

100

1. 2% of castic soda 2. 1% of soda ash3. 0.5% of soap4. 0.5% of wetting agent

2. Bleaching : whitening process

Through hydrogen peroxide

Chemical used : wetting agent (0.5%) + soda ash (1%) + H2O2 (3%)

OR only peroxideThen heat it for 30 minutes at

100*C then hot wash for 10 minutesPeroxide killer and then finish

it with cold wash .4-6% of H2O2 is used for full

bleach

Through hypo chloride

Chemical used : bleaching powder

in cold water for 60 minutes Then 2-3 cold wash and it is

done In this process yarn is less

whiter then hydrogen peroxide

process .4gpl is used for full bleach and

2gpl is for semi bleach

Dying formulaWeight of yarn x %of shade

100 Weight of colourStock solution

Cal. Of colour : let the shade be 0.5% and weight of yarn be 20gm

=20gm x0.5 =20 x0.5 x 100 100 100 1 1 100 =20 x 1 = 10cc 2 Cal. Of water : (1:20) •Weight of yarn x 20•20x20 =400ml

Soda ash : fixing agent

Glabbler salt : exhausting agent

% Salt(gpl) Soda9gpl)0.5 10 2.5-5

0.5-1 10-20 5-10

1-2 20-30 10-15

2 30 20

REACTIVE DYE Process of cold water : o Soke yarn in cold watero Add stock solution in same watero Add salt and soda asho Stir and keep it for atleast 45 minutes at

80*Co Soaping in hot water and cold wash

Process of hot water :o Soke yarn in cold watero Add stock solution in hot watero Add salt and soda asho Stir and keep it for 45 minutes at 80*Co Acetic wash in cold watero Hot water soaping and finish with cold

wash

VAT DYE Stock solution = 1gm hydro 1gm wetting agent 1gm castic soda 100ml water

Temperature 50-60*Co Hydro for reducing oxygen for even dyeso Castic to maintain alkaline mediumFurther contain 5 methods

MIXED DYEo Dip the yarn in acetic acido Stock solution of all colours according to

the %o Stir and leave it for 45 minuteso Acetic wash in cold watero Soaping in hot water and finish it with

last cold water wash

FABRIC DYING For single colour the process is same as

yarn dying process But for tie and dye we have to first tie

the fabrric according to the design we need

Detailed in following pictures

printing