Daba tasar and oak tasar are the two well known non-mulberrytasar silks in India. They are wild in nature and classified as tropical and temperatetasar depending on the region of cultivation. While Daba tasar belongs thespecies of Antheraea mylitta D. and is a pure race, the oak tasar is theinterspecific hybridised product of Antheraea roylei and Antheraeapernyi which makes Antheraea proylei J. The bivoltine mulberry silkis generated from the species of Bombyx mori L and is a cultivatedvariety.


Silk, being a natural product, inherently contains someamount of variation in all its characteristics. It is not only important tounderstand the extent of variability present in its various physical andmechanical properties but also to know whether there exists any pattern in itscharacteristics while unravelling from its cocoons. Such a pattern may lead tobring a perceptible change in the appearance of the final product.


A study was conducted to understand the progressive changein the characteristics of filament along its length in Daba tasar , Oak tasarand Bivoltine mulberry varieties of cocoons available from three differentregions of India, i.e., Bihar, Uttar Pradesh and Karnataka, respectively.










 

Observations:


The physical properties and residual sericin content of the cocoon filament from Daba tasar (Antheraea mylitta D), Oak tasar (Antheraea proylei J) and Bivoltine mulberry (Bombyx mori L) varieties were evaluated in relation to its position in different layers of the cocoon.


1)    A decrease in filament denier from the outer to the innermost layers was observed in all the varieties taken for the study.


2)    Although the average tenacity was found to increase in Bivoltine mulberry cocoons from the outer to the innermost layers, no such specific trend was observed for Daba tasar cocoons. For Oak tasar cocoons, it showed a marginal rise.


3)    The initial modulus remains constant for Daba tasar and rises marginally for Oak tasar, but shows a definite increasing trend for the Bivoltine mulberry variety.


4)    The breaking extension remains constant for Daba tasar, decreases for Oak tasar but shows an initial rise followed by a fall for mulberry cocoons.


5)    Residual sericin shows a tendency to decrease up to the fourth layer from the outermost layer for Bivoltine mulberry cocoons. Thereafter it remains unchanged. Daba and Oak tasar cocoons show a marginal decrease from the outer to the inner layer.



Reference:


R. Chattopadhyay, Subrata Das, M.L.Gulrajani & Kushal Sen, 1997, Sericologia, 37(2), 263-270.



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