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1

Detection of Remote Sensing Warp Tension during Weaving on Plain Twill and Satin Fabrics

Kaplan Volkan

Fibres & Textiles in Eastern Europe

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2021

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Vol. 29, no. 1 (145)

35--39

EN

Warp tensions were measured while a machine was operating on a woven cotton fabric with three different woven patterns. This study was carried out with image analysis methods using a high speed camera. Three weave pattern types: plain, twill and satin were woven on the same weaving machine, and thus it could be understood how weave pattern differences affect warp tension. Each of these three weaves was woven in three weft densities: 20, 28 and 45 wefts per cm. These fabrics were able to be made on a weaving machine with an automatic dobby. It was aimed to investigate warp tension differences for three basic weave patterns while keeping all machine settings constant. The weave settings of the dobby were changed for plain, twill and satin weaves. Warp tension calculation was based on the warp elasticity theory. Warp elasticises were measured by image processing methods in MATLAB using a high-speed camera. It was aimed to improve upon the new method of warp extension measurement of fabric when the loom is in operation. It was observed that the warp tension in plain fabric was higher than for twill and satin under the same conditions.

PL

W pracy mierzono naprężenia osnowy podczas wytwarzania tkanin bawełnianych o trzech różnych wzorach. Badanie zostało przeprowadzone metodami analizy obrazu przy użyciu kamery. Na tej samej maszynie tkano trzy rodzaje wzorów splotu: gładki, diagonalny i satynowy, dzięki czemu zbadano wpływ rodzaju splotu na napięcie osnowy. Każdy z tych trzech splotów został utkany w trzech gęstościach wątku: 20, 28 i 45 wątków/cm. Celem pracy było zbadanie różnic naprężeń osnowy dla trzech podstawowych wzorów splotów, przy jednoczesnym zachowaniu stałych ustawień maszyny. Obliczenia naprężenia osnowy oparto na teorii sprężystości osnowy. Elastyczność osnowy mierzono metodami przetwarzania obrazu w programie MATLAB przy użyciu kamery. Celem badania było ulepszenie nowej metody pomiaru wydłużenia osnowy tkaniny podczas pracy krosna. Zaobserwowano, że naprężenie osnowy w tkaninie gładkiej było wyższe niż w przypadku diagonalu i satyny w tych samych warunkach.

2

Changeover Process Assessment of Warp-Knitting Let-Off Equipped with Multispeed Electronic Let-Off System

Ji Yong, Jiang Gaoming 1, Tang Mengting

Autex Research Journal

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2021

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Vol. 21, no. 3

299--304

EN

Warp-knitted fabrics have gained increasing attention due to their excellent properties, and their production is strongly dependent on the warp-based electronic let-off system. Most of the existing control systems are single speed electron let-off structure, which brings a series of issues such as broken yarn, missed needle, and running thread caused by let-off delay, making it hard for manufacturer to produce the required fabrics. To fill the gap, this article proposes a new framework of a multispeed electronic let-off system for warp knitting based on closed-loop control strategy. As a demonstration of the capacity and generalizability of this newly proposed methodology, the 01-type four-channel acoustic vibration analyzer is used to test and analyze the time of switching, the let-off amounts, and the change in warp tension during the process of switching let-off amounts, including the explanation and comparison of difference values of let-off quantities. It is shown that the proposed method for the production of warp-knitted fabrics is a useful method for achieving digital manufacture of warp-knitted fabrics.

3

Impact of Whip Roller Parameters on Warp Dynamic Loads for 3D Fabrics Made on a Four-Comb Warp-Knitting Machine

Michalak Andrzej, Kuchar Maciej, Mikołajczyk Zbigniew

Autex Research Journal

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2020

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Vol. 20, no. 1

73--77

EN

The most advantageous geometry of the warp feeding system was determined from the viewpoint of compensating temporary changes in the warp length during the technological cycle of a four-comb warp-knitting machine. Dynamic simulations of the feeding system were carried out for 3 different lengths of the shift of the slider with a guide bar – designating variants (series) of the cross-sectional sizes of the 3D knitted fabrics. The courses of instantaneous warp tensions during the operating cycle of the warp-knitting machine were presented. Limit dynamic loads of the warp were determined and presented as a function of natural frequency of the whip roller. Based on the criterion of the smallest dynamic loads of the warp, the optimum natural frequencies of the whip roller were determined. In the analyzed range of the whip roller parameters, they are 3–6 times greater than the operation frequency of the warp-knitting machine.

4

Dynamic cloth fell movement. Part II: New measuring device

Azzam H. A., Büsgen A.

Autex Research Journal

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2006

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Vol. 6, no. 1

23--29

EN

Textile Technology Department, University of Applied Science, Mönchengladbach, Germany A new flexible cloth fell movement measuring device, hereafter referred to as the 'needle-mechanical device', has been developed to facilitate the use, for the first time, of a measuring position just 2 millimetres from the cloth fell. In addition, the experimental set-up was built in a combination between the needle-mechanical device and the Weave Master to record the dynamic cloth fell's movement cycles on-loom. The results of these measurements were analysed and discussed in the light of the theory developed in part I.

5

Dynamic cloth fell movement. Part I: Critical review

Azzam H. A., Büsgen A.

Autex Research Journal

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2006

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Vol. 6, no. 1

14--22

EN

Extensive coverage of previous work in the area of cloth fell movement, the circumstances of its beginning, and its influences are reviewed. The review also includes previous work describing factors that affect cloth fell movement. The advantages and disadvantages of the methods used hitherto are underlined and the need of a satisfactory measuring method is emphasised.