NOPR Collection:

Prediction of fibre quality from anatomical studies of jute stem: Part II— Prediction of strength

2002-09-01T00:00:00Z

Title: Prediction of fibre quality from anatomical studies of jute stem: Part II— Prediction of strength Authors: Majumdar, S Abstract: The tenacity values of bundles of jute fibres belonging to different varieties have been predicted from the structure of their fibre bundles as seen in the tra nsverse section of jute stems and the length of the constituent ultimate cells by multivariate regression analysis. Jute plant stems having fibre bundles compri sing greater number of compactly arranged long and fine ultimate cells give fi bres of higher strength when retted under standard conditions. Page(s): 254-258

Structure and properties of polyester MJS plied yarns

2002-09-01T00:00:00Z

Title: Structure and properties of polyester MJS plied yarns Authors: Tyagi, G K; Patnaik, A; Goyal, A; Salhotra, K R; Ishtiaque, S M Abstract: The influence of ply twist and twist direction on the structure and properties of polyester MJS yarns has been studied. It is observed that the effect of plying on fibre and yarn structural parameters is significant. If the direction of Z-wrapped surface fibres is coincident with the direction of ply twist, the helix angle and helix diameter are high, but the mean fibre extent is very low. The increase in ply twist factor results in larger helix angle, larger helix diameter , smaller yarn diameter and lower fibre extent. Yarn properties also remarkably improve after plying. The improvement in yarn properties depends upon the amount and direction of ply twist. A plied yarn produced by twisting in a direction opposite to that of wrapping of surface fibres is stronger, less extensible, less rigid, more even , and has higher abrasion resistance. Yarns plied in the Z-direction are more rigid than those plied in the S-direction. While the flexural rigidity of yarns plied in the S-direction with higher ply twist factor is considerably lower than that of the corresponding single yarns, the flexural rigidity of those yarns ply twisted in the Z - direction invariably decreases as the ply twist factor is increased. Page(s): 236-241

Generating textile designs using cellular automata

2002-09-01T00:00:00Z

Title: Generating textile designs using cellular automata Authors: Rajasekaran, S; Amalraj, R Abstract: Cellular automata (CA) are discrete dynamical systems of simple construction but complex and varied behaviour. Algebraic techniques are used to give an extensive analysis of the global properties of a class of finite cellular automata. The rule numbers in one-dimensional automata ranging from 0 to 255 have been tested and found to generate mostly geometric patterns. In two-dimensional automaton, the various rule numbers have been tested in 80×80 matrix with a grid size of five pixels and the matrix size extended to 110×110 with a grid size of three pixels each that resulted in chaotic, stable and high life. The behaviour of the neighbourhood cells has been analyzed by their categories, grouped together and represented graphically, resulting in uniform and non -uniform patterns, which may well be utilized for textile designs. The algorithm is designed with an option to generate the rule number itself randomly and hence the design generated is highly unpredictable and it is observed that different patterns are generated to each iteration of the algorithm. Page(s): 242-247

Microfibres—An overview

2002-09-01T00:00:00Z

Title: Microfibres—An overview Authors: Mukhopadhyay, Samrat Abstract: A microfibre can be polyester, nylon, acrylic, rayon or lyocell, spun in such a way so that the filaments are finer than 1.0 denier. The article is an overview on some of the important developments that have taken place in the field of microfibres. The interesting applications of microfibres in various fields have introduced leading fibre manufacturers like DuPonl, BASF, Hocchst, Trevira, Teijin, Lenzing and Wellman make their own brands of microfibres. Nevertheless, high cost, lack of experimentation, less research in the field of new machinery and want of expertise to handle these fibres have hindered the growth of the microfibre market. These areas need particular attention if the potential of this fibre is required to be tapped. Page(s): 307-314