Degumming of silk

Degumming or boiling-off is the process employed to remove the silk gum (sericin) enveloping the two raw silk threads (fibrion) (Fig. 4-14). During the 

Degumming is effected by careful treatment of silk with high pressure water, acids, alkalies, soaps and synthetic detergents. Chemical dissolution of sericin is obtained partly by hydrolysis and partly by dispersion, independent of the method used. Soap works mainly by dispersion whilst alkalies have a strong hydrolytic effect [57]. 

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Proteases modification of protein fibers (wool), improvement of felting properties, improvement of printability of wool, degumming of silk... 

The degumming of silk can also be carried out by foam method. The silk skiens are subjected to the action of foam from a boiling soap bath. Skiens are actually hung above the soap solution and the foam action has a tendency to dissolve and eliminate sericin. This method, however, is not popularly adopted. 

Proper selection of equipment for degumming of silk is essential to prevent chafed surface, chafe marks, uneven degumming and chemical damage. However, the selection of equipment depends on the type of the article to be processed. 

Silk yam is normally degummed in the hank form. In the pack (beck), the hanks are normally hung on polished wood or metal rods which are submerged in the bath and turned by hand. Alternatively, hank and spray dyeing machines can also be used for degumming of silk in yam form. In the foam boiling process foam produced by soap bath comes m contact with silk and thus causes degumming. 

Proteases Bacillius subtilis B. Licheniformis B. Oryzaeof Scouring of animal fibres, or degumming of silk, modification of wool properties. 

Deaton, A., 1980. Economics and Consumer Behavior. Cambridge University Press, Cambridge. Freddi, G., Mossotti, R., Innocenti, R., 2003. Degumming of silk fabric with several proteases. J. Biotechnol. 106, 101-112. 

Gulrajani, M., Agarwal, R., Grover, A., Suri, M., 2000. Degumming of silk with hpase and protease. Indian J. Eibre Text. Res. 25, 69—74. 

Uses Textile soap for wool, worsted, cotton, silk, nylon, and other synthetics for boil off, scouring, soaping off, dye leveling, and stripping Features Free rinsing low titer use with soda ash for degumming of silk Properties Fine flake or chip Frigate /Lo-Dose [Zeneca Ag Prods. ]... 

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