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Page 90 - Shawl Weaving Artisan - TP
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    Textile & Handloom                                                               Exercise 1.6.52
           Shawl Weaving Artisan - Wet Processing

           Practice of desizing the yarn/ fabric by using desizing method

           Objectives : At the end of this exercise you shall be able to
           •  desizing the yarn / fabric by using desizing method.

             Requirements
              Tools/equipment’s/Instruments
             •   Gas stove                       - 1 No.        •  Glass /metal stirring rods         - 1 No.
             •  Stainless steel beaker           - 1 No.        •  Protective Gloves                  - 1 Set.
             •  Soda ash (Na CO )                - as reqd.     Materials
                            2
                                3
             •  Acetic acid (CH COOH)            - as reqd.     •  Wool fabric sized               - as reqd.
                              3
             •  Washing and soaping agent        - as reqd.     •  Wool yarn hanks                 - as reqd.
             •  Lab thermometer                  - 1 No.
           PROCEDURE

           TASK 1: Desizing of wool fabric
           1  Take a fabric with sizing in it.                   Fig 2
           2  Weigh the fabric to determine the amount of soda
             ash and acetic acid required.
           3  Then Mix 2-5% soda ash (Na CO ) with hot water
                                            3
                                         2
             (around 40°C to 50°C) in a beaker.
           4  Stir the solution until the sodium carbonate is fully
             dissolved.
           5  Then put the wool fabric in the solution and ensure
             the fabric is fully covered by the solution. (Fig 1)

            Fig 1
                                                                10 Then mix 1-2% acetic acid (CH3COOH) with water
                                                                   and immerse the wool fabric in the solution.
                                                                11 Let the fabric soak in the solution for 10-15 minutes.
                                                                12 Then rinse the wool fabric thoroughly with cold water
                                                                   to remove any remaining neutralizing solution.
                                                                13 Gently  squeeze  out excess water  from the fabric.
                                                                   (Fig 3)

                                                                14 Then dry the fabric in the room temperature.
                                                                  Fig 3

           6  Let it soak for 30-60 minutes.
           7  Gently  stir the fabric  with the help  of stirring  rods
             in every 10-15 minutes to ensure even treatment.
             (Fig 2)
           8  Now take the fabric out from the beaker and rinse
             thoroughly with cold water to remove any remaining
             alkaline solution.
           9  Repeat the rinsing process until the water runs clear.

           TASK 2: Desizing of wool yarn
           Follow  the procedure  from 1-14  in  TASK 1 for yarn   Safety precautions
           desizing.                                            •  Wear protective gloves when handling soda ash and
                                                                   acetic acid.
                                                                •  Ensure good ventilation when working with these
                                                                   chemicals.
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