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Page 91 - Shawl Weaving Artisan - TP
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    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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