DYEING : Important definitions of dyeing:

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Important definitions of  dyeing:

1.    Shade %

2.    color strike

3.    Exhaustion

4.    fixation

5.    Fastness

1. Shade

     Shade means depth of color. It is expressed in % on the weight of materials.

Example: 1% shade owf(on the weight of) or 5% shade owf means we need 5 kg dyes per 100 kg of fabric in dyeing process.

    Shade can be classified as:

Light shade(Ls)= upto 0.5%dyes owf

Medium shade(Ms)= 0.6%-1.5% dyes owf

Dark shade (Ds)= 1.6+ % dyes owf

2. Color strike

    Initial exhaustion of dyes by the textiles in a dye bath is called color strike.

3. Exhaustion (E%)

     Total amount of dyes absorbed by the textile material in a dye bath.

40 kg dyes, exh-30%, waste-10%

 so total E%=30/40*100=75%

4. Fixation (F %)

     F% = Total amount of dyes finally fixed with textile material is known as Fixation.

     F% = (washing loss+ soaping loss+ any other loss)

            =75%-[7%+5%+3%]

            =(75-15)%

            =60%

* M:L ratio