Degumming of Silk

This is as per a brochure from CSTRI ( Central Silk Board)

Receipe

M:L- 1:30
Soap- 5 GPL or 15% on the weight of the material.
Soda Ash- 1 GPL or 3% on the weight of the material
Temperature- 90-95 deg C., Time- 30 to 45 minutes, pH- 9.5 to 10.5

Methods/Procedure

- Dissolve soap and soda in the required amount of water.
- Enter the material at 40 deg C
- Raise the temperature to 90-95 deg C
- Work for 30-45 minutes
- Take out the material and hot wash for 10 minutes for 60 to 70 deg C.
- Followed by cold wash.
- Removal of water by using hydroextractor.
- Drying under Shade.

Single Bath Degumming and Bleaching

Receipe

M:L- 1:30
Soap- 5 GPL or 15% on the weight of the material.
Soda Ash- 0.5 GPL or 1% on the weight of the material.
Sodium Silicate- 1.5 GPL
Hydrogen Peroxide- 20 MI/Lit
Temperature - 85-90 deg C, Time- 60 to90 min., pH- 10

Procedure

- Take required quantity of water.
- Dissolve Soap, Soda Ash and Sodium Silicate
- Enter the material at 40 Deg C
- Work for 5 minutes
- Take out the material and add hydrogen peroxide.
- Raise the temperature to 85-90 deg C
- Work for 60 to 90 minutes followed by hot wash and cold wash.
- Removal of excess water by using hydro extractor.
- Drying in Shade

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