Experimental and analytical analyses of the knitted fabric off-axes tensile test

2020 ◽  
Vol 91 (1-2) ◽  
pp. 62-72 ◽  
Author(s):  
Željko Penava ◽  
Diana Šimić Penava ◽  
Lozo Miloš
Keyword(s):  
Mechanical Properties ◽  
Correlation Coefficients ◽  
Knitted Fabric ◽  
Total Work ◽  
Fabric Anisotropy ◽  
Knitted Fabrics ◽  
Axial Tensile ◽  
Tensile Forces ◽  
Cotton Yarns

Determination of mechanical properties and predicting the behavior of knitted fabrics during the manufacturing process and finally in the use is an important part of textile science. In this study the influence of knitted fabric anisotropy on the values of maximum force, corresponding extension and total work when axial tensile forces act on specimens cut at different angles with respect to the course direction of the knitted fabric were analyzed. A plain double weft knit fabric made of single cotton yarns was studied. For different angles of cutting samples, the curves of the relation between the values of the tensile forces and the extension at break were experimentally obtained. The mathematical models obtained were compared with the experimental results, and the corresponding correlation coefficients were calculated.

Mechanical Properties of the Knitted Fabric of SPF/Modal Blended Yarn

2011 ◽  
Vol 322 ◽  
pp. 444-447 ◽  
Author(s):  
Qing Bin Yang ◽  
Yu Kun Dou
Keyword(s):  
Mechanical Properties ◽  
Soybean Protein ◽  
Knitted Fabric ◽  
Knitted Fabrics ◽  
Blended Yarn ◽  
Protein Fibers ◽  
Protein Fiber ◽  
Bending Length ◽  
The Relationship ◽  
Tearing Strength

In order to understand the influence of the blended ratio of the soybean protein fibers to the properties of blended fabrics, five soybean protein fiber/modal blended fabrics are knitted and tested. By the analysis of the results, the relationship between the properties of the blended fabrics and the blended ratio of the soybean protein fibers are obtained. With the increase of the ratio of the soybean protein fibers, the tensile strength and the elongation of the blended fabrics increase and the tearing strength and bursting strength of the fabric decrease. With the increase of the ratio of soybean protein fibers, the softness increases and the bending length, abrasion resistance of the knitted fabrics decrease.

scholarly journals A Study on Damage to PLA Knitted Fabrics During Scouring and Bleaching

2014 ◽  
Vol 16 (3) ◽  
pp. 45-50 ◽  
Author(s):  
Gulzar A. Baig ◽  
Chris M. Carr
Keyword(s):  
Mechanical Properties ◽  
Hydrogen Peroxide ◽  
Sodium Hypochlorite ◽  
Polymer Structure ◽  
Sem Analysis ◽  
Sodium Chlorite ◽  
Knitted Fabric ◽  
Fiber Structure ◽  
Knitted Fabrics ◽  
High Alkali

Abstract Ingeo® PLA (polylactic acid) knitted fabric was scoured through an exhaust technique. The scouring was carried out with sodium carbonate in the presence of a detergent at various concentrations and temperatures. The scoured fabric was bleached with various oxidative bleaching agents. Bleaching was carried out with hydrogen peroxide, sodium chlorite and sodium hypochlorite. Hydrogen peroxide was applied by exhaust and cold pad batch (CPB) techniques. It was observed that during scouring PLA fabric was degraded at high alkali concentrations and processing temperatures. The scouring temperature above 60ºC proved to be deleterious due to the scouring solution penetrating into the polymer structure and damaged the fiber. Sodium chlorite and sodium hypochlorite caused little damage to the mechanical properties of PLA. Hydrogen peroxide when applied by the CPB technique did not reduce strength appreciably but when applied by the exhaust technique decreased the strength significantly. SEM analysis revealed that hydrogen peroxide caused holes and slit formation in the fiber structure.

The Axial Warp-Knitted Fabric and its Reinforced Composite

2011 ◽  
Vol 332-334 ◽  
pp. 837-840
Author(s):  
Yi Hua Bu ◽  
Yan Feng ◽  
Hua Wu Liu
Keyword(s):  
Mechanical Properties ◽  
Woven Fabrics ◽  
Advanced Materials ◽  
Knitted Fabric ◽  
Knitted Fabrics ◽  
Unique Structure ◽  
Reinforced Composite ◽  
And Performance ◽  
Warp Knitted Fabric ◽  
Composite Reinforcement

The structure and performance of the axial warp-knitted composite were introduced, including bi-axial and multi-axial organizations. According to the unique structure of this fabric, the mechanical properties and the advantages as a composite reinforcement were compared with regular staple woven fabrics. The advantages of composites reinforced by bi-axial and multi-axial knitted fabrics were discussed and the applications of such advanced materials were briefly presented.

scholarly journals The Effect of Number and Position of Tuck Stitches within the Pattern Repeat on Air Permeability of Weft-knitted Fabrics from Glass Yarn

2019 ◽  
Vol 2 (3) ◽  
pp. 317-323
Author(s):  
Mehmet Erdem İnce
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Physical And Mechanical Properties ◽  
Air Permeability ◽  
Knitted Fabric ◽  
Knitted Fabrics ◽  
Synthetic Fibers ◽  
Fabric Structure ◽  
Knit Fabrics ◽  
Weft Knitted Fabric

The fact that weft knitted fabrics has a stretchable, 3D, porous and interlocking structure makes them unique when manufactured from high performance fibers. Knitted fabrics with different architectures exhibit different properties. Different loop forms like tuck and skip stitches with various loop lengths reveal different physical and mechanical properties. Literature review indicated that wisely arrangement of tuck stitches within the pattern repeat alter the weft-knitted fabric structure from natural and synthetic fibers. Therefore, we studied the effect of number and location of tuck stiches on air permeability of weft-knitted fabrics from glass yarn. Single-bed, flat weft knitting machine was used to knit fabrics with different architectures from three-ply glass yarn. The nominal single-end count of used E-glass yarn was 136 tex. It is anticipated that the number and location of tuck stitches within knit pattern effect physical and air permeability properties of weft-knitted fabrics from glass yarn.

scholarly journals Porosity of Knitted Fabrics in the Aspect of Air Permeability - Discussion of Selected Assumptions

2017 ◽  
Vol 25 (0) ◽  
pp. 86-91 ◽  
Author(s):  
Marie Havlová ◽  
Jana Špánková
Keyword(s):  
Theoretical Calculations ◽  
Correlation Coefficients ◽  
Air Permeability ◽  
Knitted Fabrics ◽  
Textile Materials ◽  
Yarn Hairiness ◽  
The Relationship ◽  
Very High ◽  
Single Jersey

The main focus of this paper is to look into the relationship between the structure and air permeability of single jersey knitted fabric – especially verifying some basic assumptions. First, if it is possible to neglect the permeability of yarns themselves when we evaluate that of knits, and second, if yarn hairiness plays a significant role when we evaluate the relationship between air permeability and the porosity of knits. Theoretical calculations and experiments which were performed using an analysis of microscopic images of the structure of textile materials are used for the determination of inter-yarn and intra-yarn porosity. The paper aims to show t hat the characteristic dimension of inter-yarn pores is significantly higher than that of intra-yarn pores, and also that the values of inter-yarn porosity measured using image analysis methods with hairiness and after the removal of hairiness are statistically significantly different. The correlation coefficients for the porosity values measured and calculated are very high.

scholarly journals Determination of oxygen permeability and mechanical properties of the aluminium paper foils

2014 ◽  
Vol 60 (No. 4) ◽  
pp. 172-179 ◽  
Author(s):  
Ľ. Kubík ◽  
S. Zeman
Keyword(s):  
Mechanical Properties ◽  
Tensile Properties ◽  
Food Packaging ◽  
Oxygen Permeability ◽  
Pure Oxygen ◽  
Aluminium Layer ◽  
Tensile Forces ◽  
Moduli Of Elasticity

The paper deals with the determination of the oxygen permeability and mechanical properties of butter and curd aluminium paper foils Radaflex applied in the food packaging. Foil Radaflex is a paper foil covered by the aluminium layer. The measurement of the oxygen permeability was realized according to the Standard STN EN 77 0333. The measurement of mechanical properties was realized according to the Standard STN EN ISO 1924-2. Determination of moduli of elasticity in the longitudinal and transversal direction were provided and tensile properties as maximal elongations, maximal tensile forces, tensile strengths, tensile indexes and strain at breaks of the longitudinal and transversal specimens were evaluated. The permeability of pure oxygen through aluminium paper foils was studied. Aluminium paper foil was not permeable for the oxygen.

scholarly journals The performance properties of the yarn and fabrics produced from different types of cotton

2019 ◽  
Vol 70 (05) ◽  
pp. 398-402
Author(s):  
DIRGAR ESRA ◽  
ORAL OKSAN ◽  
OZDIL NILGUN
Keyword(s):  
Mechanical Properties ◽  
Breaking Strength ◽  
Knitted Fabrics ◽  
Performance Properties ◽  
Different Types ◽  
Significance Levels ◽  
Cotton Yarns ◽  
The Relationship ◽  
Study Performance ◽  
Single Jersey

In this study, performance properties of single jersey knitted fabrics made from Aegean cotton, Supima cotton and Giza cotton yarns are investigated. Firstly, Uster parameters and breaking strength of the yarns were examined and then the properties of the fabrics knitted from these yarns were evaluated statistically. The significance levels of the relationship between the measured parameters were determined. Considering the results obtained with the mechanical properties of the fabrics with Uster analysis applied to these yarns, it is seen that the yarns made from Supima and Giza cotton fibers in extra long fiber category have more smooth, less hairiness, contain less neps and the fabrics knitted with these yarns have high mechanical properties.

Geometrical and mechanical modelings of dry relaxed slack plain knitted fabrics for the benefit of technical textile applications part II: Mechanical modeling induced by friction

2016 ◽  
Vol 87 (7) ◽  
pp. 853-864 ◽  
Author(s):  
Arif Kurbak
Keyword(s):  
Mechanical Properties ◽  
Elasticity Theory ◽  
Mechanical Model ◽  
Three Dimensional ◽  
Stable State ◽  
Geometrical Model ◽  
Knitted Fabric ◽  
Mechanical Modeling ◽  
Knitted Fabrics ◽  
Plain Knitted Fabric

In this work, based on the geometrical model given in Part I, a mechanical model is created for dry relaxed slack plain knitted technical fabrics including the three-dimensional friction effects. The equilibrium of forces and moments applied on a loop are written by using the elasticity theory of thin rods. Through this model, it is shown that a dry relaxed plain knitted fabric can be in a stable state induced by friction. The application of the model was carried out on E-glass technical fabric, which was also used in Part I as its dimensional properties were obtained through the created geometrical model. In the current part, Part II, the mechanical properties of this fabric are obtained and discussed as an exemplary application.

scholarly journals ВПЛИВ ПОВЕРХНЕВО-АКТИВНИХ РЕЧОВИН НА ПОВЕРХНЕВИЙ НАТЯГ РОЗЧИНІВ ДЛЯ ПРОМИВАННЯ БАВОВНЯНОГО ТРИКОТАЖУ

2018 ◽  
Vol 118 (1) ◽  
pp. 32-42
Author(s):  
О. Я. Семешко ◽  
Н. С. Скалозубова ◽  
Т. С. Асаулюк ◽  
Ю. Г. Сарібєкова ◽  
С. А. Мясников
Keyword(s):  
Surface Tension ◽  
Mechanism Of Action ◽  
Knitted Fabric ◽  
Knitted Fabrics ◽  
Maximum Reduction ◽  
Surface Active ◽  
Cotton Knitted Fabric ◽  
Active Substances

Analysis of the mechanism of action of surfactants in the conditions of washing cotton knitted fabrics, the establishment of surfactants for functional purposes, which should be part of the composition, and the study of changes in the surface tension of solutions of surfactants of various classes designed to create a composition for the preparation of cotton knitted fabrics. Determination of the surface tension of solutions of surfactants of different concentrations was carried out by the method of detachment of the ring, using the Du-Nui method. The paper presents the results of the analysis of the mechanism of action of surfactants in the conditions of washing cotton knitted fabrics, it is established what properties the constituents of the composition should possess and the surfactants that contribute to the maximum reduction in the surface tension of their solutions are determined. Scientifically substantiated the principles of creating surfactants compositions for the scouring of cotton knitted fabric on the basis of an analysis of the mechanism of their action and found that the wetting and washing abilities of surfactants are the determinants; the isothermal dependences of the surface tension of solutions of surfactants of various classes are first obtained. Surface-active substances and their concentrations are established, which ensure low surface tension of solutions.

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