Abstract


In this project the optimum heat setting for the Lycra knitted fabric is studied. Achieving best heat setting means perfect dimensional stability of the knitted fabric.


During heat setting process the fabric is passed through heated chambers of 200C for achieving the desired property of the Lycra knitted fabric. If the parameters like over feed, temperature, speed etc. suddenly changed, the fabric quality like GSM, width, Dimensional stability of the knitted fabric also change, thus resulting in variation between and within fabrics.


Key Points: Heat setting of Lycra, over feed, Temperature, Speed for Heat setting etc.


Introduction


Lycra blended fabric heat setting is a critical process. During heat setting process, the fabric runs continuously in the stenter machine. Any minute changes in the machine parameters will result in fabric quality variation.


Lycra is a registered trademark used for DuPont's elastane fillament. Elastane is a generic term, like polyamide or polyester. It defines a manmade fiber in which the fiber-forming substance is a synthetic chain polymer containing at least 85% segmented polyurethane.


Lycra filament is knitted or woven under tension along with other yarns. When relaxed, it tends to compact the fabric length and width to a "jam point". The "hard" fiber buckles when the fabric is "jammed", and it limits the extension of the fabric when it is being stretched. Elastic fabrics are very often appears wider and lighter, than their width and weight at "Jam point".


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The authors of the articles are associated with Centre for textile functions (CTF), NMIMS MPSTME Shirpur campus, shirpur, Maharashtra