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KMID : 1041219940360010044
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Journal of Sericultural and Entomological Science
1994 Volume.36 No. 1 p.44 ~ p.52
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DEGUMMING OF SILK FABRIC WITH AN ENZYME DEGUMMASE
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Chopra, Sheetal
Garg, Samir/Gulrajani, M. L.
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Abstract
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Degumming with enzyme Degummase can be a viale alternative to the existing methods of degumming. Degumming, carried out with the conventional method of Marseille´s soap 25% (owf) for 1.5h at boil gives a weight loss of about 24%. On comparison, degumming with 10% enzyme at 50°C for 60 min gives a weight loss of about 22%. Treatment with enzyme reguires a much lower temperature and also the treatment time is shorter than the conventional process. Processing of silk at these conditions is likely to retain the lustre and softness of silk. To economise on the quantity of enzyme, conditions were optimised for a pad-store process. An enzyme concentration of 0.5% at 50°C for a time period of 5~6h resulted in a weight loss of 22%. Though the concentration of the enzyme used was 20 times less than that used for long liquor method there was some strength loss. At 50°C treatments carried out for 7~8 h resulted in some degradation. Strength loss occurs because enzyme in the absence of any stirring keeps acting at the face where it is deposited. Effect of temperature was more pronounced than time in degrading silk.
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