Inherently flame retardant fibre blended with dope treated flame retardant fibre (KR/VR), fabric and dope treated flame retardant fibre (TR) were treated with fluorocarbon emulsion at different concentrations, curing temperature so as to investigate the effect of above parameters on repellency properties and their implication on flame retardant properties. The repellency properties were evaluated by contact angle, spray rating and oil repellency, whereas, flame retardant properties were evaluated by limiting oxygen index and char length. Thermal studies (TGA) were also carried out so as to study the possible changes in thermal chemistry of the fabrics. The fabrics were finally evaluated on Kawabata system for the objective evaluation of hand properties in terms of low stress mechanical properties and thermal insulation. The thermogravimetric studies elucidate that there is no change in the thermal chemistry of the fabric treated with fluorocarbon emulsions. The blended fabric (KR/VR) exhibited overall satisfactory performance (both functional and hand properties) compared to TR fabric.
Water and oil repellency are among the most common functional properties that need to be assessed for protective clothing, both during development and production. There are established techniques for the evaluation of these properties, but they are time consuming. Durability assessment requires washing of the repellent fabric and evaluation of repellency using standard techniques, which requires 2-3 days to reach on a conclusion. In this work a new technique based on contact angle measurement has been evolved that gives an indication of repellency within 2-3 min and durability of repellency within 30 min.
System design of cold weather protective clothing is a critical process, as it involves consideration of the effects of a number of external and internal parameters like environmental factors and physical, physico-mechanical and psychological parameters. The bulk and weight of the textile materials used in protective clothing should be as low as possible, so that clothing does not create physical stress and discomfort to the soldier and does not affect his combat duties adversely. This paper discusses the essential factors involved in the designing of cold weather protective clothing and different insulating materials available in the mark6t for developing better protective clothing. Different stores'developed at the Defence Materials & Stores Research & Development Establishment, Kanpur, the order of arrangement of various insulating materials i n those stores and the protection level achieved are discussed.
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