Weft Density Research Articles

Analyzing the Effect of Yarn Tension, Weft Yarn Type, and Weft Yarn Density on Thermal Resistance, Thermal Conductivity, and Air Permeability of Plain Woven Fabric

ABSTRACT Uncomfortable feelings during wear highly affect human health, work efficiency, and mental satisfaction. This study evaluated the thermal comfort of woven fabrics made from 16Ne ring and rotor spun weft yarns(x1). The other variables involved are warp tensions (x2) of 1 kilo newton (KN) and 2 kN, weft tensions (x3) of PFT/B- and PFT/B+T, and weft densities (x4) of 14 picks per centimeter (PPC) and 18 PPC. Comfort properties such as thermal conductivity, thermal insulation, and air permeability were measured and analyzed. The fabric produced from rotor-spun weft yarn showed better thermal comfort properties than the fabric made from ring-spun weft yarn. The results of the analysis revealed that when warp and weft yarn tension increased and weft density decreased, thermal conductivity and air permeability also increased. However, thermal insulation of the fabric decreased as yarn tension increased. On the other hand, as the weft density increased, the thermal insulation of the fabric increased. Air permeability increased as weft tension increased from PFT/B- to PFT/B+T and it decreased as weft density increased from 14 PPC to 18PPC. The maximum thermal conductivity and minimum thermal resistance were attained at 14 PPC weft density and ring-spun weft yarn.

A progressive optimization of axial compression performance of 3D angle-interlock tubular woven composites through textile structure and yarn configuration innovations

Lightweight tubular composite materials with excellent compression performance are important structural components for load-bearing or energy absorption. Generally, outstanding performance depends on the structural design. Herein, a progressive structural optimization of 3D angle-interlock tubular woven reinforced composites (3DATWCs) is performed. The structural factors under consideration involve proportion of warp lining yarn, layers of weft yarn, surface constraint yarn and weft density. The axial compression performance and failure process of 3DATWCs with different structures are investigated through experiments and finite element method. The results indicate that increasing proportion of warp lining yarn can significantly improve the axial compression performance of 3DATWC. However, simply increasing proportion of warp lining yarn may decrease the straightness of yarn and constraint on warp yarns, leading to the performance reduction. The problem of performance reduction can be solved by introducing surface constraint yarn or increasing weft density. Finally, an optimization strategy is unveiled. Compared to ordinary structure, the ultimate load, plateau average load, ultimate stress, elastic modulus, total energy absorption and specific energy absorption of optimized 3DATWC increase by 101.88 %, 96.12 %, 77.46 %, 142.55 %, 119.06 %, and 77.39 %, respectively. Additionally, the axial compression performance is seriously affected by the fiber waviness, yarn waviness and interfacial properties, and can be further improved through reducing the waviness during the preparation of fabric preform.

Effect of abrasion level on surface handling and thermal conductivity of blended suit fabrics

The tactile comfort of garments is of great interest for researchers to achieve their performance efficiently. This research aims to study the ability of blended worsted fabrics to be used as men’s suits by checking the thermal conductivity (k) and surface handling properties that are represented in surface roughness deviation (SMD), surface mean friction (MIU), and electrostatic properties before and after abrasion actions. Different levels of weft yarn counts (16 Ne and 24), weft density (19 and 21 per cm) and fabric weave structures (stripped twill 2/2 and stripped satin 4) were used. Abrasion weight loss percentage, thermal conductivity, surface roughness, and friction in warp and weft directions, and electrostatic properties were measured. Results showed that all the fabric factors studied are significant to affect abrasion weight loss percentages, thermal conductivity, and fabric roughness in the weft and warp directions. Fabric friction behavior follows the fabric roughness, but there is a difference between weft direction and warp direction. In addition, the fabrics achieved a reasonable resistance to form static charges after abrasion actions, and the fabric factors studied are not significant to affect the electrostatic properties except for abrasion cycles as P-value equals 0.03.

Influence of the Structure of 3D Woven Fabrics on Radiation Heat Resistance and Thermophysiology Properties

The goal of this study was to investigate the influence of structural and constructional parameters of 3D fabric on two of the most significant properties of fabrics for thermal protection—resistance to radiation heat and thermophysiological properties. Today’s textile materials provide high thermal protection, but they display poor thermophysiological properties in extreme conditions. Six samples of 3D fabrics were developed using a laboratory weaving machine. The examined samples were made of identical warp, with a total of three different weft densities, and were woven in two different weaves. The conditions of the weaving process and construction were the same. EN ISO 6942:2022 and EN ISO 11092:2014 methods were used to determine the resistance of the samples to thermal radiation and thermophysiological properties. The results showed that the samples that contained folds in their structure with a larger volume of “trapped” air had better thermophysiological properties and better resistance to thermal radiation. The volume of air contained in the 3D structure was used as a thermal insulator and it did not have a negative effect on the thermophysiological properties. The described structure enabled the 3D fabric to have an optimal ratio of thermal protection and comfort, which is of crucial importance for fabrics used to make thermal protective clothing.

The mechanical properties of Kevlar three-dimensional angle-interlock fabrics and composites

In this article, in order to investigate the difference of mechanical properties between three-dimensional angle-interlock (3DAI) structure and two-dimensional (2D) structure. Kevlar filaments were used as raw material to prepare 3DAI fabrics. The tensile properties of Kevlar 3DAI fabrics were investigated and the influence of warp damage and crimp wave height on the tensile properties was analyzed too. The bending properties and low-velocity impact properties of the 3DAI Kevlar/EP composites and the 2D composites were compared. The results revealed that the warp degradation and crimp percentage in 3DAI fabrics increase with the increase of weft density. The maximum warp degradation rate is 15% and the maximum crimp percentage is 5.4%, which has a negative effect on the mechanical properties of the 3DAI fabrics and the developed Kevlar/EP composites. Compared with the 2D plain composites, the 3DAI composites have superior impact resistance and anti-stratification performance. Moreover, which also has a superior ability to withstand multiple impacts.

Assessment of the Influence of Fabric Structure on Their Electro-Conductive Properties.

Electro-conductive fabrics are key materials for designing and developing wearable smart textiles. The properties of textile materials depend on the production method, the technique which leads to high conductivity, and the structure. The aim of the research work was to determine the factors affecting the electrical conductivity of woven fabrics and elucidate the mechanism of electric current conduction through this complex, aperiodic textile material. The chemical composition of the material surface was identified using scanning electron microscopy energy dispersion X-ray spectroscopy. The van der Pauw method was employed for multidirectional resistance measurements. The coefficient was determined for the assessment of the electrical anisotropy of woven fabrics. X-ray micro-computed tomography was used for 3D woven structure geometry analysis. The anisotropy coefficient enabled the classification of electro-conductive fabrics in terms of isotropic or anisotropic materials. It was found that the increase in weft density results in an increase in sample anisotropy. The rise in thread width can lead to smaller electrical in-plane anisotropy. The threads are unevenly distributed in woven fabric, and their widths are not constant, which is reflected in the anisotropy coefficient values depending on the electrode arrangement. The smaller the fabric area covered by four electrodes, the fewer factors leading to structure aperiodicity.

Effect of Weft Yarn Type and Weaving Parameters on Surface Roughness and Drapeability of Woven Fabric

ABSTRACT Comfort is a qualitative feature and one of the requirements that modern garment buyers place on their purchases. The purpose of this work is to study the effect of weft yarn type, weft yarn tension, warp yarn tension, and weft density on drape and surface roughness properties of cotton plain woven fabric. Each factor was treated at two levels such as yarn type (ring-spun and rotor-spun), warp tension (1 kN and 2 kN), weft tension (PFT/B- and PFT/B+T) and weft density (14 picks/centimeter (PPC) and 18 PPC). Full factorial design was used to design the experiment and analyze the results of the experiment. The results of the analysis showed that fabric produced from ring-spun yarn has smoother surface and better drape than fabric produced from rotor spun yarn. As weft and warp yarn tension increased, the surface roughness of the fabric increased and fabric drape decreased. On the other hand, fabric drape decreased as the weft density increased and the surface roughness of the fabric increase as weft density decreased.

A mini review on the ballistic protection performance of 2D and 3D woven fabric structures woven from technical yarns for body armormaterials in military application

This mini-compilation study included a review study conducted on the ballistic protection performances of 2D and 3D structured woven fabric structures for body armor materials in military applications. As conclusion, orthogonal type 3D woven fabric structures have higher ballistic protection performance compared to conventional 2D woven fabric structures by locking the high-performance yarns used and preventing slippage between layers. It is recommended to use ceramic-structured front plates such as B4C to break armor-piercing bullets, reduce penetration, and absorb a significant portion of their high kinetic energy. UHMWPE, PPD-T, and PBO technical yarns, which have fine yarn counts (between 466 dtex and 933 dtex) can be produced by 1x1 plain woven fabric construction as woven fabric structures (lamina). They must have also high warp and weft density values ​​(between 30 and 40 warp/cm and weft/cm), and orthogonal 3D woven fabric structure, high warp, and weft yarn tension (between 20 cN and 50 cN per warp yarn), 160 rpm as production speed, and multi-layered (between 13 layers and 16 layers in lamina form) in honeycomb (sandwich) geometry. Moreover, the impregnation process can be applied with CaCO3, SiO2, PVB, or CNT particles (in the particle size range of 100 nm to 400 nm) with chemicals such as PEG (in the range of 60% to 75% concentrations), in the range of 80 °C to 160 °C temperatures and between 1 hour and 3 hours. Coating (STF applications) is extremely important and successful for ballistic protection performance at IIIA, III and IV levels for NIJ standards. Future studies should include orthogonal 3D structured woven fabric applications from UHMWPE, PPD-T, or PBO technical yarns by applying STF technology in this field. They should be also examined comparatively from an experimental perspective.

Low-Velocity Impact and Post-Impact Residual Flexural Properties of Kevlar/EP Three-Dimensional Angle-Interlock Composites.

In this study, five three-dimensional angle-interlock fabrics with different warp and weft densities were fabricated using 1000D Kevlar filaments. The Kevlar/EP composites were prepared by vacuum-assisted molding techniques. The low-velocity impact property of the composite was tested, focusing on the effects of the warp and weft densities, impact energy, impactor shape, and impactor diameter. The damage area, dent depth, and crack lengths in the warp and weft direction were used to evaluate the impact performance, and the specimens were compared with plain-weave composites with similar areal densities. The dominant failure mode of the conical impactor was fiber fracture, while the dominant failure mode of the hemispherical impactor was fiber-resin debonding. The cylindrical impactor showed only minor resin fragmentation. The residual flexural strength of the composite after impact was tested to provide insights into its mechanical properties. The study findings will provide a theoretical basis for the optimization of the design of impact-resistant structures using such materials and facilitate their engineering applications.

Investigation of the Effect of Different Weft Densities and Finishing Conditions on Seam-Caused Fabric Puckering in Denim Fabrics

Bu çalışmada 3 farklı atkı sıklığına sahip denim kumaş 3/1 Z dimi örgüsünde dokunup 2 farklı ön terbiye işleminden ve 3 farklı fikse sıcaklığından geçirilip mamul kumaşlar elde edilmiştir. Yapılan deneysel çalışmada çözgü ve atkı iplikleri, tarak eni, tarak numarası ve örgüler aynı olup toplam 18 adet mamul kumaş üretilmiştir. Literatür incelendiğinde, denim kumaşlarda ön terbiye ve fikse sıcaklığı değişiminin dikiş büzülmesine nasıl bir etki yaptığı konusunda bir çalışma ile karşılaşılmamıştır. Bu sebeple, farklı ön terbiye ve farklı fikse sıcaklıklarında işlem görerek üretilmiş 18 adet kumaştan paça formunda numune dikilip 3 farklı endüstriyel yıkama işlemine tabi tutulmuş, endüstriyel yıkamalar sonrası toplam 54 adet paçada atkı yönündeki dikiş kaynaklı kumaş büzülmeleri (puckering) değerlendirilmiştir. Numunelerin subjektif olarak değerlendirilmesi ile atkı sıklığı ve terbiye ramöz sıcaklıkları arttıkça kumaşlardaki büzülme görüntüsünün azaldığı sonucuna varılmıştır.

Photometric Stereo Method Used for Woven Fabric Density Measurement Based on 3D Surface Structure

The measurement of the density of woven fabrics based on the vision method has been widely developed. This study used a photometric stereo method to measure the warp and weft density of woven fabrics based on the 3D surface structure. Six 2D images of the fabric were recorded, each with a different lighting direction. The six images were then reconstructed using the unbiased photometric stereo algorithm to produce the three-dimensional surface structure. The reconstructed image was used to detect and correct the skew angle with the Hough transform. For each image, a depth profile was made toward the x-axis to get the weft curve and towards the y-axis to get the warped curve. The two depth curves were filtered using a locally weighted smoothing (LOESS) filter. This study successfully measured the density of woven fabric with an average error for warp and weft of 0.64% and 0.45%, respectively.

Research on thermal comfort and moisture management properties of drapery fabrics produced with polyester yarns having different fibre cross-sectional shapes and TiO2 amount

This study aims to provide an investigation regarding the effect of fibre cross-sectional shape, incorporated TiO2 amount (%) during polyester yarn production, and the weft density parameters respectively, on thermal comfort, moisture management, water vapour permeability, and air permeability properties of polyester drapery fabrics. Completely randomized three-factor analysis of variance (ANOVA) was conducted at the significance level of 0.05. SNK tests were also performed to observe the means of each parameter. Some of the weft yarn production parameters and the weft density (picks/cm) factors were found as significant factors in some thermal comfort and moisture management, water vapour, and air permeability properties of drapery samples.

Extra thin sidelight-emitting polymer optical fiber narrow fabrics for UV structural adhesive joints: design, preparation and performance experiments

Ultraviolet (UV) bonding technology is widely used across industries. As the curing reaction is initiated via an external light source, the use of fast-curing structural UV acrylates has so far been limited to joint designs with at least one transparent joining part. By introducing a side-emitting polymer optical fiber textile into the adhesive layer, which acts as an embedded light source, the technology can be made accessible for applications with nontransparent substrates such as metals. This paper describes the development of extra thin polymer optical fiber narrow fabrics designed to enable curing of structural adhesive joints. Polymer optical fibers (warp) were combined with different low-titer polyester weft yarns in two fabric design types with different primary out-coupling mechanisms: undulation and surface modification of the polymer optical fibers. The effect of yarn properties, thread densities and weave on fabric quality, geometry and lateral light intensity of each type were investigated. Results showed that narrow fabric production within the tight geometric limits required is feasible. Fabrics manufactured with nontextured yarns at low titers and low weft densities exhibited the highest lateral light intensities for the surface modification type fabric. To compensate for intensity loss over fabric length, investigating light coupling from both sides is recommended for this fabric type. For the undulation type fabric, the lateral light intensity characteristics indicated that the high tenacity yarns are promising candidates for the fabrication of low sidelight attenuation fabrics through modulation of the weft density.

Water vapour resistance modelling of basic weaving structure

Water vapour diffusion through textile fabrics plays a crucial role in maintaining body comfort. Developing and producing comfortable textiles is a major challenge for manufacturers of fibres, yarns and fabrics. This study aims to develop a simple model to predict the water vapour permeability of textile fabrics as a function of their structural parameters to assist manufacturers in developing comfortable fabrics. To achieve this goal, geometric modeling of the woven structure was proposed to calculate porosity at the micro-and macro-pores level. Two mathematical models were introduced based on the principle of diffusion of water vapour through a textile fabric. To validate the two models, a series of 18 samples was prepared with three basic fabric structures: Plain, Twill and Turc Sateen. To vary the compactness of the structures, three weft densities were chosen: 18, 21 and 24 picks/cm. In addition, since the material influences water vapour diffusion, two types of weft yarns were inserted: 50% CO/50% PET and 100% PET. The results show that the two models are reliable for predicting water vapour resistance (Ret) depending on the structural parameters of the textile fabric.

Investigating Tear Strength in Sustainable Cotton-Lyocell Blend Siro Spun Fabrics: Twist Multiplier and Weave Type Effects

This study investigates the tear strength properties of a cotton-Lyocell blend siro spun fabric. Lyocell fibre production follows sustainable practices with a closed-loop system and renewable resources, requiring less energy and water. Furthermore, Lyocell is a biodegradable fibre, ensuring its environmentally friendly decomposition. Similarly, cotton offers durability, washability and biodegradability, making it an eco-conscious fabric alternative. Woven fabrics were created using cotton-Lyocell blend siro spun yarns with varying twist multipliers and thread densities in plain, twill and satin weaves. The tear strength of these fabrics was measured and regression analysis was conducted to investigate the impact of different parameters. The results demonstrate that twist multiplier, warp density and weft density significantly affect the tear strength of all fabric types. Furthermore, a comparison was made between the tear strength of the cotton-Lyocell siro spun fabrics and conventional ring-spun cotton fabrics and found that cotton-lyocell siro spun fabrics offer better strength properties compared to conventional ring-spun cotton fabrics. The findings of this study provide valuable insights into fabric strength factors, contributing to future research in textile development for enhanced durability and sustainability.

Tekrarlı Yıkamaların ve Yapısal Parametrelerin Japon Tüketicilerin Havlu Kumaş Tercihine Etkisi ve Türk Tüketicilerle Karşılaştırılması

The objective of this research is to determine the effects of weft yarn count, weft density and repeated laundering effects on terry fabric preference of Japanese participants and to compare with the preferences of Turkish participants. In addition, the terry fabric samples are evaluated by Japanese panelists in order to determine the importance of characteristics related to preference. Terry samples woven with nine different constructions are subjected to 5, 10, 20 and 40 washing cycles in a household washing machine before subjective evaluations. The subjective evaluations are performed in two steps with a total of 40 Japanese volunteers consisting 20 men and 20 women at the ages of 18-25 years. Both Japanese and Turkish participants preferred terry fabric samples woven with finer weft yarns at a higher rate. The preference rate for terry fabrics decreased with increasing washings cycles among the participants of both countries. In addition, the most important characteristics related to preference of Japanese participants has been revealed.

Study on the sound absorption of jute fabrics: effects of woven factors and multilayer structures

As porous materials, textiles have been widely used in noise reduction and control engineering due to the advantages of lightweight and easy processing. In this work, the effects of structural factors and physical properties of woven jute fabrics on sound absorption were investigated. Woven jute fabrics with different warp and weft density, thickness, areal weight, and bulk density are employed for acoustical impedance tube measurement, and the warp and weft flexural rigidity, and air permeability of woven jute fabric were measured. The relationship between structural characteristics and sound absorption properties was studied, which has provided good reference for the design of fabric texture. Furthermore, multilayered structure was also constructed by facile plying-up method, followed by the evaluation on the effects of various layering configuration, and then for improved sound absorption. This investigation has mainly focused on woven factors and physical properties, which is benefit to the fabrication of woven jute fabrics with optimal structural details for enhanced sound absorption.

Structural design and mechanical properties of glass fiber weft-knitted biaxial tubular fabrics

In order to design glass fiber weft-knitted biaxial tubular (WKBT) fabric with the excellent dimensional stability and outstanding mechanical properties, six kinds of WKBT fabrics were prepared by four kinds of knitting structures (1 + 1 rib structure, face plating structure, back plating structure and face and back plating structure) and two kinds of stitch yarns (polyester and polytetrafluoroethylene fiber). The tensile properties, tearing properties and bursting tearing properties of WKBT fabrics with different binding tightness were investigated. The results showed that the failure of WKBT fabric was composed of the breakage of insertion yarns and the breakage of knitting structures. The tightness of knitting structures have significant effect on the mechanical properties of WKBT fabric. Compared with 1 + 1 rib structure, the plating structure affects the mechanical properties of WKBT fabrics by improving the weft density, binding tightness and dimensional stability. The kind of stitch yarn is another factor that affects the mechanical properties of WKBT fabrics.

3D Printing on Textiles – Overview of Research on Adhesion to Woven Fabrics

3D printing on textiles has great potential to influence developments in various industries. It enables the production of new, potentially personalised products in areas such as technical textiles, protective clothing, medical products, fashion, textile and interior design. 3D printing can also contribute to waste-free production processes. In the method of 3D printing on textiles, the material is applied directly to the textile substrate to create 3D objects, patterns or designs on the surface. The fused deposition modelling (FDM) technology, where thermoplastic filaments are extruded and deposited in thin layers based on a 3D model, is widely used for this purpose. A precise control of factors such as temperature and speed is essential in FDM to regulate the flow of polymer material during the printing process. The most commonly used polymer for 3D printing on textiles using FDM is polylactic acid (PLA). Acrylonitrile butadiene styrene (ABS) is another widely used material, known for its low shrinkage rate and high printing accuracy, while thermoplastic polyurethane (TPU) is used due to its exceptional mechanical properties, e.g. tensile strength, flexibility, durability and corrosion resistance. Good adhesion between 3D printed objects and the textile surface is essential for the production of quality products. Adhesion depends on various factors, e.g. textile properties, printing parameters and the type of polymer used. The composition of the woven fabric, including the areal density, warp and weft density, yarn count, fabric thickness and weave pattern, significantly affects the adhesion strength of the 3D printed polymer. When considering double weaves, which allow different materials in the upper and lower layers, better adhesion properties are found than at single weaves. A cross-sectional analysis revealed that the polymer penetrates deeper into a double-woven fabric, resulting in improved adhesion. In general, the study highlights the advantages of double weaves for 3D printing applications on textiles.

Textured Polyester Fiber in Three-Dimensional (3D) Carpet Structure Application: Experimental Characterizations under Compression-Bending-Abrasion-Rubbing Loading.

In this article, textured polyester fiber was used as pile yarn in three-dimensional woven carpet structures. The properties of developed polyester carpets under various mechanical loading were studied. A statistical method was used to analyze the experimental data. Regression models were proposed to explain the relationships between carpet pile height and density. The study showed that the bending rigidity and curvature of dry and wet polyester pile fiber carpets were influenced by pile height and pile density (indirectly weft density) in that the downward concave large bending curvature was obtained from very dense carpet structures. In addition, the average dry bending rigidity of the carpet was over eight times higher than the average wet bending rigidity of the carpet. The thickness loss (%) and resilience (%) for each recovery period of various polyester carpets were proportional depending on the pile density. It was broadly decreased when the pile density was increased due to the compression load carrying capacity per polyester fiber knot, which was higher in carpets having dense knots compared to sparse knots per area. On the other hand, the polyester pile density and height largely affected the carpet mass losses (%) of all textured polyester carpets under an abrasion load. The number of strokes received after completely fractured polyester pile yarns during a rubbing test were increased when the pile heights for each pile density were increased. Findings from the study can be useful for polyester carpet designers and three-dimensional dry or impregnate polyester fiber-based preform designers in particularly complex shape molding part manufacturing.