Warp tension distribution over the warp width and its effect on crimp distribution in woven fabrics

Özkan, Gülcan; Eren, Recep

doi:10.1108/09556221011048295

Cited by 6 publications

(6 citation statements)

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“…Therefore, the sliding behavior is captured when the frictional force is weaker than the tensile stress of the weft yarn. The state of interaction retains adhesion until the equivalent frictional force is equal to the critical frictional force and converts to a sliding base in equations (4) and (5). The frictional force that is determined by frictional coefficient and induced by the stretch force in m ¼ 0.1 is less than that in m ¼ 0.2.…”

Section: Three Phases Of Interactionmentioning

confidence: 99%

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Effect of the frictional coefficient and pre-tension on stress distribution of fabric during the weaving process

Zhang

et al. 2017

Textile Research Journal

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The non-uniform stress distribution of woven fabric has a significant influence not only on its mechanical performance in service, but also on its weaving efficiency in the fabrication process. For investigating the stress distribution in woven fabric, a numerical model at the yarn scale was established to simulate the interlacing process between the weft and warp yarns using an explicit finite element solver. The yarns were assumed to be a homogeneous continuum and the transversal isotropic constitutive equation was used. A modified lenticular initial shape was used as the cross-section of the yarn and trajectories of warp and weft yarns were set to be straight. The classical Amonton–Coulomb law was used for the tangential behavior between the weft and warp yarns. The simulation results reveal that the interaction between weft and warp yarns consists of three phases in terms of contact, adhesion and sliding. The sectional stress distribution in the weft yarn determined by multi-points contact between a single weft yarn and a group of warp yarns was also analyzed. The tension stress of the weft yarn was larger in the middle part than that in both sides. Based on the numerical model, the effects of two key parameters, namely the frictional coefficient and weft pre-tension, on the stress distribution were discussed in detail. The weft crimp angle and warp tension distribution uniformity decreased as the frictional coefficient decreased, whereas the warp tension fluctuation range did not obviously decrease. However, an improved method by exerting pre-tension in two ends of weft yarn was proposed and the warp tension fluctuation range was significantly decreased. The distribution trend of warp tension obtained from the numerical simulation showed an acceptable tendency with experiment measurements.

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Section: Three Phases Of Interactionmentioning

confidence: 99%

“…The warp tensions on the middle part were higher than those on both sides of the loom due to different yarn crimps. 5,6 However, there is a large variation of warp tension along the loom width, which may cause an unclear passage for filling.…”

mentioning

confidence: 99%

Effect of the frictional coefficient and pre-tension on stress distribution of fabric during the weaving process

Zhang

et al. 2017

Textile Research Journal

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“…Some researchers have investigated the relationship between the yarn pre-tension and the 2D woven fabric structures. Ozkan and Eren 18 discovered the weft crimp in the edge zones was higher than in the middle of the fabric when the same pre-tension was applied to the warp yarn in the weaving of woven fabrics. Ying et al 19 used the finite element model(method) to simulate the yarn interlacing process, and the simulation results showed that the weft inclination angle fluctuation range was significantly decreased by applying weft pre-tension.…”

Section: Introductionmentioning

confidence: 99%

The matching relation analysis of yarn pre-tension in weaving 3D bi-directional angle-interlock fabrics

Cui

et al. 2022

Journal of Industrial Textiles

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Yarn pre-tension is an important technological parameter in the weaving process and significantly affects the geometry and properties of woven composites. 3D bi-directional angle-interlock (3DBA) fabrics have the same yarn crimp in the warp and weft directions, which requires a special matching relationship between the warp and weft yarn tensions applied in the weaving process. This study focused on obtaining the pre-tension matching relationship that applied between the warp and weft yarns in the weaving of 3DBA fabrics. A quasi-static mechanical model of yarn interactions in the weaving of 3DBA fabrics was developed based on the 2D woven fabric yarn interaction model. The weaving process of 3DBA fabrics could be divided into two interweaves as one cycle. In a given interweaving of a single group of yarns, the pre-tension applied to the warp yarns tends to increase irregularly with the position of the interweaving point and varies linearly with the weft pre-tension. The weft crimps distribution of 3DBA fabrics was compared when yarns were applied to the different proportions of pre-tension in the weaving process. The experiment result shows that the sample with the best uniform distribution of yarn geometry is the one to which the yarn pre-tension calculated by the model is applied in the weaving process. The result provides theoretical support for warp and weft pre-tension applied in the 3DBA fabrics weaving process.

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“…This not only affects the weaving process but can also negatively influence the weaving loom. Uneven tension in the thread system unequally affects their crimp and its distribution in the fabric [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Method of Predicting the Crimp of Jacquard-Woven Fabrics

2021

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The aim of this study was to investigate the distribution of crimp in new jacquard fabric structures (in which one-layer and two-layer weaves are combined) in the fabric width and to create a method of crimp prediction. It was established that crimp was around 18.80% and changed within the limits of errors, i.e., a range of only ~4%, in the fabric width. It can therefore be said that the warp crimp was constant in the fabric width. Because the warp crimp of jacquard fabric changed insignificantly (within the limits of errors), it can be stated that the fabric-setting parameters and structural solutions were chosen and matched correctly, and such fabric can be woven on any jacquard weaving loom.

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Warp tension distribution over the warp width and its effect on crimp distribution in woven fabrics

Cited by 6 publications

References 0 publications

Effect of the frictional coefficient and pre-tension on stress distribution of fabric during the weaving process

Effect of the frictional coefficient and pre-tension on stress distribution of fabric during the weaving process

The matching relation analysis of yarn pre-tension in weaving 3D bi-directional angle-interlock fabrics

Method of Predicting the Crimp of Jacquard-Woven Fabrics

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