Influence of structure of the yarn on mechanical characteristics of yarns exposed to dynamic stress

Tumajer, Petr; Ursíny, Petr; Bílek, Martin; Moučková, Eva; Pokorna, Martina

doi:10.2478/v10304-012-0009-5

Cited by 8 publications

(4 citation statements)

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“…The mechanical properties of the yarn, which is determined by the force of the warp in the mathematical model, were determined experimentally [11,13]. in the nodes with ten single forces as well.…”

Section: Condition Of Separationmentioning

confidence: 99%

Mathematical Modelling of the Heald Shaft

Bílek

Kovář

Skřivánek

2016

Autex Research Journal

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The manufacturers of weaving equipment recently endeavour to minimise the necessary designing plays in the weaving loom mechanisms. One of the mechanisms most exposed to stress is the shedding motion that defines the held-shaft stroke. Its end part is the heald shaft. The heald shaft constitutes a problematic assembly of the shedding motion. The design employed presently is characterised by dynamic impact loading caused by designing play in the suspension of healds into the heald shaft. During weaving cycle, the healds fly between the main beams of the heald shaft, producing a considerable force pulse. This paper is concerned with the description of dynamic behaviour of the existing design on the basis of mathematical modelling and verification of obtained results by means of experimental analysis.

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Section: Condition Of Separationmentioning

confidence: 99%

Mathematical Modelling of the Heald Shaft

Bílek

Kovář

Skřivánek

2016

Autex Research Journal

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“…In recent years, the yarn structure has undergone considerable changes with the advent of advanced spinning technologies such as compact, Siro, and compact-Siro spinning. 11,12 To further improve traditional ring spinning, compact spinning includes a condenser behind the drafting field, such that the spinning triangle is reduced or substantially eliminated. [13][14][15] Siro spinning, invented by the Commonwealth Scientific and Industrial Research Organization (CSIRO) for wool spinning in 1975-1976, has become renowned in common fiber spinning.…”

Section: Introductionmentioning

confidence: 99%

Strength distribution superiority of compact-Siro spun yarn

Wang

Gao

2019

Journal of Engineered Fibers and Fabrics

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This study examined the superiority of the strength of compact-Siro spun yarn. First, the strength properties of four types of yarn-ring, compact, Siro, and compact-Siro spun yarn-were compared based on an experiment with 9.7 tex and 14.6 tex polyester yarns. Yarn unevenness and compactness were analyzed in terms of their influence on yarn strength. It was determined that compact spinning enhanced the strength distribution by improving the overall yarn compactness. Siro spinning significantly increased the minimum yarn strength by reducing unevenness. Furthermore, compact-Siro spun yarn, which incorporates the advantages of both compact and Siro, remarkably improved the yarn strength distribution. These results were verified in the first part of the experiment. Finally, the four types of yarn were applied in the same weaving process. The results indicated that the efficiency of weaving with compact-Siro pure polyester yarn was higher than that of other methods by 3%-6%, thereby confirming the superior productivity of the method.

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“…The force To from the warp operates in the position of the thread eyelet. The mechanical properties of the yarn that is determined by the force of the warp in the mathematical model were determined experimentally [20][21][22]. The point of application of this force is located in one particle.…”

Section: Figure 1 System Of Damping Of Healdmentioning

confidence: 99%

Mathematical Model of the Heald with Damping Element

Bílek

Skřivánek

2015

Autex Research Journal

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This study focuses on the analysis of the existing design solution of shedding mechanism. It is characterised by a heald attachment into the heald shaft with a necessary design allowance. The preparation of a mathematical model for the new concept of the heald attaching to the heald shaft frame is explained in this study. A damping element for dissipating the energy created during the heald impact on the carrying wire of the heald shaft is currently used for the high-speed weaving loom. This system makes use of a damping element, fitted in the profile of the rod at an optimum distance from heald eye. This element provides for reduction of the heald velocity before its drop upon the supporting wire because the opposite section of the heald is pressed into the rubber element. The calculated results of the new concept of the heald attaching to the heald shaft frame are compared with the existing solution without application of the damping element.

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Influence of structure of the yarn on mechanical characteristics of yarns exposed to dynamic stress

Abstract: Abstract:This paper is a direct follow-up of the paper [1]

Cited by 8 publications

References 0 publications

Mathematical Modelling of the Heald Shaft

Mathematical Modelling of the Heald Shaft

Strength distribution superiority of compact-Siro spun yarn

Mathematical Model of the Heald with Damping Element

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