General Recipe for Scouring and Bleaching of Knitted Fabric
Scouring and Bleaching are pretreatment processes in the textile industry. As it is a chemical process, it very sensitive and important process. In this article, we discuss the General Recipe for Scouring and Bleaching of Knitted Fabric.
Recipe for Scouring and Bleaching
- To find the effects of different kinds of peroxide stabilizers on whiteness and whiteness retention on cotton knitted fabric by single bath scouring and bleaching with H2O2.
- To find the effects of different kinds of peroxide stabilizer on damage factor on cotton knitted fabric by single bath scouring and bleaching with H2O2.
To achieve these effects, cotton knitted fabric must be scoured and bleached in a single bath by using a common recipe maintaining the all parameters constant except the peroxide stabilizer. Parameters include fabric, chemicals, temperature, time, liquor ratio, machine, quantity of fabric, and chemicals. To investigate the effects, peroxide stabilizers must be varied both by qualitatively and quantitatively.
General Recipe:
A common recipe that was used is given below:
- Fabric (cotton, knitted, plain weaved) … … … … … … … … 200 gm
- Caustic soda (NaOH, 45 Be´) … … … … … … … … … … … 1.5 g/l
- Soda ash (Na2CO3) … … … … … … … … … … … … … … … 2 g/l
- Hydrogen peroxide (H2O2, 35%) … … … … … … … … … 3 g/l
- Peroxide stabilizer … … … … … … … … … … … … … … … x g/l
- Sequestering agent (QSE) … … … … … … … … … … … … … 1 g/l
- Wetting agent (SCF) … … … … … … … … … … … … … … … 1 g/l
- Anti-creasing agent (ACN) … … … … … … … … … … … … 2 g/l
- M: L ratio … … … … … … … … … … … … … … … … … … … 1:15
- Temperature … … … … … … … … … … … … … … … … … … 1000 c
- Time … … … … … … … … … … … … … … … … … … … … … 1 hr
To vary stabilizer qualitatively three types of stabilizer were used. They were applied individually and combinedly (taking two) so the following six different stabilizers were used: –
- Sodium silicate
- Tri sodium phosphate
- Organic
- Sodium silicate and Tri sodium phosphate
- Sodium silicate and Organic
- Tri sodium phosphate and Organic.
To vary the stabilizer quantitatively following different quantities were used:
- 0 g/l
- 0.5 g/l
- 1.0 g/l
- 2.0 g/l
- 3.0 g/l
Apparently, thirty different recipes would arise from six stabilizers and five separate quantities but twenty-five different recipes were resulted since 0 g/l stabilizer gives a single recipe instead of six recipes for six stabilizers. So total of twenty-five single bath scouring and bleaching with the above-mentioned recipe each having a different stabilizer and different quantity of stabilizers were carried out.
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