Standardization of process parameters for imparting bulkiness in bivoltine raw silk by chemical treatment using Box - Behnken experimental methodology

Abstract

In order to introduce bulkiness in raw silk, this study was taken up. Calcium nitrate chemical was used to impart bulkiness in the bivoltine raw silk produced from CSR 2 x CSR 4 race cocoons reared in India. Using the Box-behnken method experimental design in which 27 different combinations are formed to standardize the process variables viz., twist levels, chemical treatment temperatures, durations and chemical concentrations. The bulky raw silk thus produced was characterized for change in diameter, add-on %, tenacity, elongation, shrinkage %, Bulk shrinkage, crimp concentration, skein shrinkage and crimp recovery using standard testing procedures. It was observed that bivoltine raw silk twisted to the level of 1500 TPM and treated with calcium nitrate solution having 5.5% concentration at 75°C for 45 seconds duration has imparted required bulkiness in the yarn and having characteristics suitable for production of chemically treated bulky silk fabric.