Page 91 - Shawl Weaving Artisan - TP

Textile & Handloom Exercise 1.6.53

Shawl Weaving Artisan - Wet Processing

Practice of scouring and calculate the percentage weight loss

Objectives : At the end of this exercise you shall be able to
• scour different types of yarn and fabrics.

Requirements

Tools/equipment’s/Instruments Materials
• Gas stove - 1 No. • Wool, cotton yarn hanks - as reqd.
• Stain less steel beaker - 1 No. • Wool fabric and cotton fabric - as reqd.
• Soda ash - as reqd.
• Acetic acid - as reqd.
• Washing and soaping agent - as reqd.
• Lab thermometer - 1 No.
• Glass /metal stirring rods - 1 No.

Refer Ex. No. 1.6.51 - TASK 1

Textile & Handloom Exercise 1.6.54
Shawl Weaving Artisan - Wet Processing

Practice of different samples fabric/yarn for different bleaching powder.
Hydrogen peroxide and sodium chlorite
Objectives : At the end of this exercise you shall be able to
• bleaching the wool yarn, fabric with hydrogen peroxide
• bleaching the cotton yarn, fabric with sodium chlorite.

Requirements
Tools/equipment’s/Instruments
• Gas stove - 1 No. • Sodium hydroxide(caustic soda) - as reqd.
• Stainless steel beaker - 1 No. • Lab thermometer - 1 No.
• Acetic acid - as reqd. • Glass /metal stirring rods - 1 No.
• Formic acid - as reqd. • Rubber Gloves.(disposable) - 1 Set.
• Hydrogen peroxide - as reqd. Materials
• Sodium chlorite - as reqd.
• Sodium silicate - as reqd. • Wool, cotton yarn hanks - as reqd.
• Sodium bisulfite (NaHSO ) - as reqd. • Wool and cotton fabric - as reqd.
3
PROCEDURE

TASK 1: Bleaching of wool yarn & fabric with hydrogen peroxide
1 Fill a clean container with warm water (35-45°C). 5 Maintain the temperature at 45-50°C (higher
temperatures can damage the wool).
2 Slowly add 3-5% hydrogen peroxide (H O ) while
2
2
stirring gently. 6 Keep the yarn in the solution for 1-2 hours, stirring
occasionally for even bleaching.
3 Then adjust the pH to 8.5-9.0 using sodium silicate
(pH must be controlled to avoid fiber damage). 7 Then check the color of the wool.
4 Now immerse the scoured wool yarn into the 8 If the desired whiteness is achieved, drain the
prepared bleaching bath. bleaching bath and rinse the yarn well with lukewarm
water.

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