Abstract
Degumming of eri silk cocoons was carried out using three different concentrations of sodium carbonate and neutral soap along with three different duration of boiling following Box and Behnken design of experiment. Higher amount of degumming loss was observed with more sodium carbonate concentration and duration of boiling for both white and brick red eri silk cocoons. Single fibre tenacity decreases with increase of sodium carbonate concentration as well as duration of boiling. Breaking elongation is affected only by sodium carbonate. Presence of neutral soap has no impact on degumming loss and single fibre tensile characteristics. About 10% sodium carbonate and neutral soap concentration each along with 1-h boiling time facilitates uniform degumming of eri silk cocoons. Degumming loss of about 10% was found without any significant deterioration of single fibre tensile characteristics.
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