NOPR Collection:

Comfort properties of double face knitted fabrics for tennis sportswear

2018-03-23T05:22:24Z

Title: Comfort properties of double face knitted fabrics for tennis sportswear Authors: Suganthi, T; Senthilkumar, P Abstract: The comfort properties of different bi-layer knitted structures made from tencel yarn as an outer layer and acrylic/micro-fibre polyester yarn as an inner layer have been studied. Six union fabrics have been produced and then analyzed objectively and subjectively for their comfort properties. The air permeability, water vapour permeability, wicking ability and drying rate are found to be higher and thermal resistance is found to be lower for bi-layer knitted fabric made out of micro-fibre polyester (inner layer) with less tuck points as compared to all other fabrics. The same structure shows good ranking on subjective rating of thermal environment scale. The results are discussed with 95% significant level with ANOVA analysis and Friedman one-way analysis of variance. Page(s): 9-19

Cyclic bursting loading on needle-punched nonwovens: Part I – Distention behavior

2018-03-23T05:20:08Z

Title: Cyclic bursting loading on needle-punched nonwovens: Part I – Distention behavior Authors: Kumar, Bipin; Das, Apurba; Sharma, Atul; Krishnasamy, Jagatheesan; Alagirusamy, R Abstract: The present study aims at examining different needle-punched polypropylene nonwovens under different cyclic bursting pressure. Various fabric parameters including mass density, punch density and fibre fineness have been investigated. For the cyclic test, the distension is measured at different cyclic bursting pressures proportionate to the bursting strength of the fabric. Other parameters including the cyclic pressure magnitude, the number of cycles, and the rest time at peak pressure have also been investigated. It has been found that the bursting strength and distension of fabric increase with an increase in mass density, while they show opposite trend with punch density and fibre denier (p < 0.01). The distension value of each sample increases with an increase in the cyclic parameters i.e. number of loading cycle, rest time and pressure peak. Page(s): 20-24

Dimensional stability of cotton, tencel and tencel/cotton blend plain weft knitted fabrics

2018-03-23T05:17:22Z

Title: Dimensional stability of cotton, tencel and tencel/cotton blend plain weft knitted fabrics Authors: Ramasamy, K A; Nalankilli, G; Shanmugasundaram, O L Abstract: Pure cotton, 33/67 tencel/cotton, 67/33 tencel/cotton, and pure tencel yarns of 30 Ne count have been produced in the cotton spinning system and then used for knitting plain weft structure with three ranges of tightness factor to study their dimensional stability. Then knitted fabrics are subjected to dry, wet and tumble dry relaxations. Courses per inch(cpi), wales per inch(wpi), fabric thickness and areal density are measured at the end of each relaxation. Constants k₁, k₂, k₃, k₄ values for stitch density, cpi, wpi and loop shape factors are calculated using measured stitch length. Test results are subject to multilevel factorial analysis to determine factor contribution to the dimensional changes. It is found that the fibre contribution to the shrinkage is very less as compared to the contribution made by stitch length and relaxation treatments. Similarly, the quantum of length and width shrinkage is determined primarily by the stitch length (tightness factor). This is also confirmed by the calculation and comparison of loop shape factor. Thickness of the fabric is influenced significantly by relaxation treatment and fibre composition. Areal density is primarily determined by relaxation treatment and stitch length rather than by fibre composition. Hence, it is concluded that tencel and cotton are similar in dimensional characteristics. Page(s): 25-30

A modeling study on lateral compressive behavior of structured needle - punched nonwovens

2018-03-23T05:14:25Z

Title: A modeling study on lateral compressive behavior of structured needle - punched nonwovens Authors: Alirezazadeh, Azam; Zarrebini, Mohammad; Ghane, Mohammad Abstract: The aim of this work is to study the compression behavior of cord-structured needled fabrics. In order to achieve the objectives of this research, melt-spun polypropylene fibres of various linear densities have been produced by varying the spinning pump speed. The effect of linear density of melt-spun polypropylene fibres on compressive behavior of the fabrics has been investigated. A Zwick tester set in compressive mode is used to obtain variation of compressive force versus compression thickness. Van Wyk law is adapted to model the lateral compressive behavior of cord-structured needled fabrics. The experimental results are compared with the theoretical curves calculated using Van Wyk law. Results show that the increase in linear density of fibres tends to reduce the compressive force required to compress the samples to a pre-defined thickness. An acceptable conformity between Van Wyk’s equation and compressive behavior of cord-structured needled fabrics is also observed. Page(s): 31-35