Abstract
Munden and earlier workers established that in plain knitted fabrics the fabric dimensional parameters namely Kc, Kw and Ks are constant at dry and wet relaxed state for wool, cotton, orlon and nylon yarns. But in the present study of cotton/lycra core spun yarn single jersey derivative knitted fabrics the values for Kc, Kw and Ks varies with loop length. The ratio of Kc/Kw also varies with loop length. In this paper, Single jersey fabric is produced from Polyester/lycra aircovered yarn with different loop lengths. The study covers about the testing of dimensional properties of the single jersey knitted fabric. After the fabric production, the fabric was dry relaxed. Wales per inch, courses per inch, fabric width, loop length and fabric thickness are all measured. Then the fabric was wet relaxed and tested for the above parameters. Then the samples were heat set at various stretch levels at 180°C. From the study, it was found that the dimension of fabric shows considerable change during wet relaxation. The fabric shows very good appearance when heat set at all stretch levels at 180°C in course direction. The fabric with a loop length of 2.5 mm was found to have better appearance when compared to the fabrics of other loop lengths. In particular 10% stretch level shows a better appearance for 2.5 mm loop length. Keywords: Dimensional stability, dry relaxation, wet relaxation, cotton/lycra core spun yarn, loop length, single jersey knitted fabric.
Highlights
Dimensional stability of weft-knitted fabrics is a serious problem in view of fabric quality control (Keshkari 2002; Punj. 2000)
In the present study of cotton/lycra core spun yarn single jersey derivative knitted fabrics the values for Kc, Kw and Ks varies with loop length
The study covers about the testing of dimensional properties of the single jersey knitted fabric
Summary
Dimensional stability of weft-knitted fabrics is a serious problem in view of fabric quality control (Keshkari 2002; Punj. 2000). There are reports available on the geometry and dimensional properties of plain knitted fabrics (Mokhopadhyay et al, 2003). Doyle and Hurd (1953), found that the stitch density of plain knitted fabrics in the dry relaxed state is dependent only on the loop length, and independent of other yarn and knitting variables. Ks = kc x kw and kr = kc/kw where c and w are the courses/unit length and wales/unit length and is the loop length (length of yarn knitted in one loop), s the stitch density or No of loops per unit area and Kc, Kw, and Ks are constants such that kc x kw = ks and are called as fabric dimensional parameters). Munden found out the values for Kc, Kw and Ks for the worsted plain knit fabrics from experimental measurements
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