Sambhu Nath Chattopadhyay
National Institute of Research on Jute & Allied Fibre Technology, India
Sambhu Nath Chattopadhyay is a Principal Scientist in ICAR Discipline inTextile Chemistry .Area of interests are pre-treatment, bleaching, dyeing, finishing of natural textile fibres and development of handmade paper from lignocellulosic fibres.
A novel approach for upgrading the dyeing properties with natural dyes as well as UV protection function of the obtained dyeing was investigated. Jute fabric was premordanted with sequential treatment of biomordant (myrobolan and pomegranate) and ecofriendly chemical mordant (ferrous sulphate and potash alum). Extraction condition of natural dyes from manjistha, annatto, ratanjot and babool was standardised and applied on double premordanted jute fabric. Natural dyeing on myrobolan – ferrous sulphate mordanted fabric produces maximum colour yield as well as uniform and level dyeing. UV protection properties of jute fabric dyed with babool, ratanjot, annatto and manjistha produces very good rating after premordanting with sequential treatment of biomordant & chemical mordant. UV protection properties of natural dyes follows the order babool > annatto > manjistha > ratanjot.