NOPR Collection:

Structure and structure-property relationship in native cotton : Some challenges to breeders

Mon, 01 Sep 2003 00:00:00 GMT

Title: Structure and structure-property relationship in native cotton : Some challenges to breeders Authors: Moharir, A V Abstract: This paper presents a brief review of the literature on the current status of the supra molecular structure of native cotton fibre and of the experimental data on the physical properties and cellulose crystallite X-ray orientation parameters in respect of a large number of the same cotton varieties, belonging to different species of cotton grown at widely different agroclimatic locations, namely Coimbatore, Nagpur, New Delhi and Sirsa, between 11.0⁰ and 29.0⁰ North latitudes in India. Also presented and discussed are the data on cellulose synthesis in sixteen cotton varieties grown under identical agroclimatic conditions at one location. Possible reasons for the variations in the physical and technological properties of fibres have been observed and the implications of these as challenges to cotton breeders in India are foreseen in the light of the demand of the modern cotton processing technologies. Page(s): 348-362

Effect of phase change material content on properties of heat-storage and thermo-regulated fibres nonwoven

Mon, 01 Sep 2003 00:00:00 GMT

Title: Effect of phase change material content on properties of heat-storage and thermo-regulated fibres nonwoven Authors: Zhang, X X; Wang, X C; Zhang, H; Niu, J J; Yin, R B Abstract: The composition and properties of a series of sheath/core composite polypropylene fibres nonwovens with different phase change material (PCM) contents in the core have been studied using SEM, DSC and temperature sensors. It is observed that the PCM content in the fibre, sheath/core ratio and the content of 4-hole spiral crimp PET fibre affect the temperature regulating ability of the nonwoven. The temperature regulating ability has no truck with the fibre titer in the experimental scale. There can be a maximum temperature difference of 9.3°C between the nonwovens made from composites and control (polypropylene) fibres during temperature rising and 10.2°C between control and composite samples during temperature dropping. Page(s): 265-269

Alkali deweighting of acid-modified multicomponent copolyester fibre

Mon, 01 Sep 2003 00:00:00 GMT

Title: Alkali deweighting of acid-modified multicomponent copolyester fibre Authors: Yang, Ruxin Abstract: The treatment conditions for alkali deweighting of acid-modified multicomponent copolyester fibres have been optimized. The satisfactory silk- like effect is observed under the specific treatment conditions [7.5g/L NaOH, 85°C temperature, 40 min treatment time, 1:40 material-to-liquor ratio, and 1.0g/L promoter]. After alkali deweighting, the special micro-pit structure occurs on the surface of acid-modified fibres which enhances the fibre permeability, adhesion regain, capability of colouring and feel. The X-ray diffraction patterns show that the degree of crystallization of fibre decreases after alkali peeling. Page(s): 343-347

Properties of woven fabrics containing core-sheath DREF-III yarn in weft

Mon, 01 Sep 2003 00:00:00 GMT

Title: Properties of woven fabrics containing core-sheath DREF-III yarn in weft Authors: Ishtiaque, S M; Das, A; Yadav, P Abstract: The properties of plain woven fabrics made of DREF-III yarns having staple fibre core-sheath yarn, twistless core component and hollow sheath component in weft and 2-ply cotton ring-spun yarn in warp have been studied. Three different types of weft yarn, namely 59 tex yarn with staple viscose fibre in both core and sheath , 118 tex yarn with staple viscose fibre in core and water-soluble staple PVA fibre in sheath, and 118 tex yarn with PVA in core and viscose in sheath, were prepared on DREF-III system using 50:50 core-sheath ratio. It is observed that the fabric made from twistless core component in weft shows very good tensile strength, tear strength, crease recovery and abrasion resistance, whereas the fabric with hollow sheath component in weft shows bulky and compressible structure. Page(s): 260-264