Textile Testing Lab
RECENTLY COMPLETED PROJECTS
Investigation on causes for poor dimensional stability of tasar fabrics and remedial measures
G. Thimma Reddy, H.H. Shambulingappa and Arindam Basu
(i) It was concluded that shrinkage was mainly due to imbalance in use of warp (very thin) and weft (very thick) denier and non uniform yarn in weaving (ii) Proper selection of construction particulars such as ends and picks / inch, twist will decrease the shrinkage of tasar fabrics (iii) Steamed yarn shrinkage is 8-9%, hence use of steamed yarn in weaving process may partly decrease the shrinkage % of tasar fabrics (iv) BTCA treatment was found to reduce the shrinkage to almost zero after 2nd wash. Further, it significantly improved crease recovery angle and tearing strength of tasar fabrics. There was no effect on tensile properties.
Biofinishing of tasar silk fabric using enzymes
Brojeswari Das, K. Jaganathan, Sreenivasa & Subhas V. Naik
Enzymatic bio-finishing process for silk fabrics has been standardised for commercial applications. It is found that bio-finishing of tasar silk fabrics with enzymes has enhanced the properties of fabrics in terms of aesthetic and thermo-physiological comfort significantly.
Enzyme treated fabrics are ideally suitable for dress material applications. This technology and developed products have been demonstrated in tasar clusters and would be popularized for tasar dress materials.
Characterisation of silk sericin for cosmetic applications
M. A. Joseph, S.A. Hipparagi, K. Jaganathan & Subhas V. Naik (CSTRI, Bengaluru); G. Ravikumar (SBRL, Bengaluru)
Suitable technology to recover the sericin from mulberry silk on commercial scale from HTHP degumming liquor has been standardized. To convert the sericin liquor to powder form, spray drying and freeze drying techniques were found suitable among the drying techniques.
The sericin powder has been characterized for its pH, nitrogen content, protein content, ash content, moisture content, molecular weight, SEM analysis, secondary structure, heavy metal content, viscosity changes on storage and microbial content. Suitable methods for hydrolysis and removal of heavy metals have been developed. A few sample cosmetic products with the extracted sericin have been developed.
Cosmetic formulations with sericin as active components can be produced. This will help the silk processing sector in value addition (by-product utilisation) as well as address the pollution issues.