Process of dying
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Transcript of Process of dying
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