Influence of knit structure on heat transfer and flame retardancy

The aim of this work was to investigate the influence of knitted structure on the burning time and heat transfer process through knitted fabrics used for functional garments. Investigations of flame retardancy were carried out on plain fabrics knitted from Nomex Delta TA single and folded yarns and investigations of comfort determinative heat transfer were carried out on double-layered fabrics with cellulose yarns in the outer layer and synthetic yarns in the inner layer. It was established that dynamic of the heat transfer process depends at a higher level on the knitting pattern because the amount of air depends on the order of loops ranged in the fabric. The investigations have also shown that it is possible to increase heat transfer and flame retardancy more than twice only by choosing reasonable knitting structure without changing of fibres raw composition or additional finishing processes.