Yarn Fineness Research Articles

Structural Design and Performance of Cut-Resistant Fabrics with Concave-Convex Arrays.

As the risk of social security increases, it is crucial to develop flexible protective materials that combine flexibility with high protective performance. Ultra-high-molecular-weight polyethylene (UHMWPE) was selected as the raw material, and four types of flat-knitting cut-resistant fabrics were ultimately designed and prepared from a three-dimensional longitudinal dimension and concave-convex array structure based on rib knitting. A series of experiments must be conducted on fabrics in order to study the law of protection performance of different structural fabrics. They were thus subjected to comprehensive evaluation and theoretical analysis of cut resistance. The results demonstrate that the four structural fabrics exhibited resilience in abrasion tests, withstanding over 100,000 cycles without failure. A weighting algorithm was employed to determine the comprehensive cutting resistance of the S1, S2, S3, and S4 structural fabrics, resulting in values of 1939.9 gf, 2298.6 gf, 2577.1 gf, and 2822.2 gf, respectively. Therefore, S1 reached class A4, which is sufficient to address a medium cut hazard. Similarly, S2, S3, and S4 reached class A5, which is adequate to address a high cut hazard. The obtained fitting equation, with uniform yarn fineness T as the dependent variable, demonstrates that the cut resistance improved as the concave-convex density level increased.

Prediction of The Ultraviolet Protection Provided by Woven Fabric Construction Using Fuzzy Logic

The negative impact of UltraViolet (UV) radiation on human health is an issue that is gaining importance gradually, and the demand for the production of fabrics with UV protective properties is increasing progressively. Textile materials provide simple and useful protection against UV radiation. The degree of this protection is determined by the Ultraviolet Protection Factor (UPF). The effects of the yarn fineness and the woven fabric tightness, both used in the main representative woven fabric weave-types/constructions (plain, satin, twill), on UPF and bifunctional UV protection were examined and are presented in this article. A prediction model determined by fuzzy logic programming was derived to describe these effects of the aforementioned parameters. The results show very good agreement between experimental and predicted values.

Caracterización del ovino criollo en las comunidades del distrito de Lambrama (Apurímac, Perú)

The study was carried out with Creole sheep in flocks from the communities of Cruzpata and Siusay, both in the Lambrama district, Apurímac, Peru. The study aimed to characterize its productive capacity for meat and wool. Samples were taken from 60 sheep from two flocks to determine live weight, carcass weight, carcass yield, fleece weight and lock length. In addition, using 187 sheep from six flocks from the same area, samples of rib wool (10 g) were taken for analysis using OFDA 2000 equipment. The phenotype of the Creole sheep presents an angular body covered with fleece of various colours; bare face, belly and long legs, which grazes the puna, in an extensive system and without technical support from the State. Live weight, carcass weight and carcass yield are low, mainly affected by age, with variations like what occurs in other places in the mountains; Measurements of fleece weight and lock length are affected by age and sex, and by the lack of periodic shearing. The textile characteristics of the wool show medium fineness, with high variability, with relatively high comfort and spinning fineness indexes; better on the fleece of two-toothed females. The most important correlations were between fibre diameter (DM) and comfort factor (FH) (r=-0.5925); between DM and fineness of yarn (FH) (r=0.5857) and between FC and FH (r=-0.8767), which would indicate that the wool from the Lambrama area is of good quality for the textile industry.

Extraction, physicochemical and structural characterisation of palm grass leaf fibres for sustainable and cleaner production of textile and allied cellulosic applications

Natural fibres are in great demand as a clean and green material as reinforcement in sustainable and environment-friendly biodegradable composites. The study aimed to extract palm grass leaf fibres through water retting, a cleaner and greener approach compared with the use of 5–10% NaOH. The physicochemical characterisation was done by SEM, optical microscopy, FT-IR, XRD, TGA, bundle strength, moisture content and standard biochemical tests for cellulose, hemicellulose, lignin and ash. New natural fibres extracted from Curculigo capitulata by water retting showed a smooth surface of uniaxial fibres under SEM and optical microscope compared to eroded surfaces of chemically extracted fibres. Both the fibres extracted by water retting and with 5% NaOH showed nearly similar crystallinity index (84–85%) and size (2.44nm), whereas the former contained 64% cellulose with bundle strength 154MPa compared to 72% and 219.11MPa with the latter. While using 10% (NaOH) showed cellulose 82.29 ± 0.63%, crystallinity index 87.43%, and bundle strength 256.46 ± 15.81MPa. Approximately similar lignin content (20.30 ± 0.91–21.66 ± 1.18%) and mass degradation (%) were obtained in water-retted and 5%–7.5% NaOH extracted fibres. FT-IR spectra showed the characteristic bands at 3421cm−1 for O–H stretching and 2917cm−1 for alkyl C–H stretching in cellulose; at 1630cm1 for CC stretching in lignin. All the extracted fibres showed industrial potential similar to successful natural fibres for fine rope, yarn, handmade paper, and fabrics aiming for a circular bioeconomy.

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.

Highly stretchable, durable, and reversibly thermochromic wrapped yarns induced by Joule heating: With an emphasis on parametric study of elastane drafts

Abstract Highly stretchable thermochromic wrapped yarns, which employ elastane filament (EF) as core, stainless steel wire, and thermochromic polyester filament as the first and second winding, was prepared, and the effect of elastane draft upon yarn properties was investigated. It was found that the elastane draft played an essential role in determining the final yarn behavior, and the optimized elastane draft parameter was 2.5 using Technique for Order Preference by Similarity to Ideal Solution. It is a distinctive configuration of yarn’s constituents and the EF draft that are responsible for the exceptional stretchability of yarns, and it showed mechanical robustness following cyclic stretch. Importantly, the yarn exhibited rapid, durable, and reversible color conversion when subjected to cyclic voltage, cyclic abrasion, and alkali. Finally, a flower-shaped pattern was fabricated by embroidering yarn onto an elastic substrate as a proof-of-concept, and no obvious variation of color fidelity was observed during the stretch.

Experimental and numerical study on thermal protective performance of weft-knitted spacer fabric system against hot pressurized steam

Hot pressurized steam is a dangerous environment threatening the safety of workers. Developing steam protective clothing with excellent thermal protective performance (TPP) and clarifying its design mechanism are essential to protecting workers. This study totally developed eleven spacer fabric systems (SFSs) and investigated the effects of four design factors of spacer fabrics (SFs) on TPP, including heat setting, spacer yarn fineness, feeding structure, and top layer structure. Additionally, a heat and mass transfer model was established to analyze the steam protective mechanism of SFSs. The results demonstrated that SF heat setting had a negligible effect on TPP of SFSs. As the spacer yarn thickened to 80 D, the TPP of SFSs improved and the positive effect of feeding structure II on TPP increased. Conversely, dense mesh on the SF top layer had a negative effect on TPP. The model predicted that skin burn times of SFSs decreased with the increasing of pressure. When the pressure was 2.5 kPa, the relative errors between experimental and predicted skin burn times were the smallest (0∼12 %), which could more accurately simulate the steam protective mechanism of SFSs. These findings provide a theoretical basis for the development of high performance steam protective clothing.

Present Status and Future Prospects of Jute Diversified Products in Domestic & Export Markets

"Now a day’s products diversification and commercialization are very challenging work in the field of agriculture. Jute is one of the cheapest as well as the strongest amongst the all other natural fibres. India is the largest producer of jute followed by Bangladesh and China and world leader in manufacturing jute goods. Tremendous competition from synthetic materials as well as declining demand for traditional jute goods, demand is expected to rise in respect of its value-added diversified products like fine yarn, blended yarn, specialty fabrics and non-woven based on jute and jute waste. Lots of innovative new products have been developed with high value-addition by the researchers now a days, viz., home textiles, jute composites, jute geo-textiles, paper pulp, technical textiles, chemical products, handicrafts and fashion accessories etc. Globally, demand for diversified jute products is growing particularly in developed country markets such as USA, Canada, Australia and Japan, where peoples are becoming increasingly conscious about carbon footprint of consumer goods."

The effect of dyeing tubes’ structure on the colour difference of yarns

In the study, the effect of the structure of the dyeing tubes used in bobbin dyeing on the colour difference of the yarns was investigated. For this purpose, dyeing was done using 5 dyeing tubes with different dye permeability. Yarn samples were taken from the inner, middle and outer winding layers of the dyed bobbins. The colour difference of the yarns was measured with a spectrophotometer. It was observed that as the dye permeability of the dyeing tubes increased, the colour difference decreased and a more homogeneous dyeing was obtained. When the bobbins were evaluated in terms of diameter, it was seen that the colour difference was at least in the middle diameter. As the dye permeability increased, the colour distribution along the bobbin diameter became more homogeneous. In addition, it was determined that the colour difference decreased in fine yarn and high winding density.

Statistical Study on the Effect of Yarn Fineness on Heat and Mass Transfer Properties of Single Jersey Knitted Fabrics

Abstract Heat and mass transfer properties of textile fabrics determine thermal comfort. This paper introduces a statistical study on the contribution of yarn fineness to the heat and mass transfer properties of single jersey cotton and polyester fabrics through relevant measurements. It is observed that yarn fineness affects those properties at different levels in differing fiber types.

Experimental Investigation on Tensile Strength of Twisted Ramie Fiber Yarns

Natural fibers as reinforcement can be an alternative material with an environmentally friendly profile. The aim of this work is to determine the potential of Indonesian Ramie fiber, as a reinforcing material in cement mortar, by exploring new twisting ideas for natural fibers and the impact of twisting techniques on tensile strength. Long fibers are arranged in four cross-sectional areas and also in different numbers of constituent layers, as 2 ply and 3 ply. The spinning process contributes to the final yarn result which the process is carried out in the same direction for each ply, but to unite each ply it is necessary to rotate the direction of rotation and the direction of the single fiber yarn (opposite way). Twisted Ramie fiber yarns were tested for tensile strength using the Universal Testing Machine (UTM). It showed that comparing at the same weight of 24 gr twisted yarn, 3 ply twisted yarn shows the highest tensile strength value as much as 110,32 MPa than 2 ply as much as 96,56 MPa that indicates that the number of ply affects the tensile strength of the yarn.

Disperse dyes, temperature and yarn parametre's effect on microfibre shedding of polyester spun yarn

The yarn dyeing factories discharge liquid waste laden with a variety of hazardous substances, including microplastic fibre (MPFs), which are found in aquatic ecosystems. During dyeing, MPF shedding factors were determined in this study. Shedding factors were determined at six polyester yarn dyeing factories to assess MPF release for (1) dark and (2) light shading. Three dyeing processes were considered including normal, carrier and high temperature. Sawdust-based activated carbon was utilized to decolourize dye wastewater. Flocculation and clarification were done without a flotation process to obtain low-density MPF. A hot needle test was applied to visual identification under an optical microscope and quantification was done by filtering, weighting and count of the yarn. A maximum of 0.00399 % weight loss (wt.) was found for dark shade in the high-temperature dyeing process and 0.00392 % (light) was found in carrier dyeing to dye a coarser yarn. In contrast, 0.4562 mg L−1 fibre particles (≤ 0.225 mm) shedding in normal dyeing, for a light shade, was observed to a fine yarn where a minimum of 0.00138 % wt. was found. Shorter fibre length, higher denier, and courser yarn were associated with the greatest MPF discharge at high-temperature dyeing for a dark shade. The usual effluent treatment plant (ETP) of the textile industry can remove only 75.52 % MPFs of wastewater. Shedding of MPF during dyeing is remarkably higher than the domestic wash cycle of garments. Wastewater of textiles containing MPFs would appear as a regular and extensive initial source of MP emissions, which can damage the ecological system.

Process optimization of continuous flax fiber/polylactic acid prepreg filaments toward high performance 3D‐printed composites

AbstractA novel process optimization was proposed by rotational vibration and structural design of flax yarns to manufacture large‐tow flax fiber prepreg filaments for 3D printing components with balanced efficiency and performance. It demonstrated that the untwisting of flax yarns generated by rotational vibration produced a dispersed yarn structure, which provided more flow channels for the polylactic acid (PLA) resin to infiltrate yarns. As for the structural design of yarns, the specific surface area increases after replacing the single yarn of large liner density with multiple fine yarns, which further shortens the impregnation time. Unidirectional continuous flax fiber‐reinforced thermoplastic (CFRTP) composites were obtained by 3D printing. The mechanical test results showed that the tensile properties of CFRTP composites were significantly increased using filaments consisting of multiple fine flax yarns and the aid of rotational vibration due to the improved impregnation of yarns with PLA resin.

Incorporating Variable Porosity into the Determination of Effective Permeability in Interchanging Double Cloth Woven Fabrics Using Darcy's Law.

Woven fabrics are widely used for thermal protection due to their porosity, which provides thermal insulation and breathability. This research focuses on investigating the influential parameters in the thermal protective properties of layer interchanging double cloth, including the woven structure and varying yarn fineness. The properties affecting the protective properties and comfort of multilayered woven fabrics include the fabric thickness, fabric porosity, and air permeability. Darcy's law is applicable for determining the effective air permeability of woven fabrics. By understanding and controlling fabric porosity, it becomes possible to develop thermal protective clothing that combines improved comfort, cost-efficiency, and effectiveness. This study represents a novel approach for the clarification of airflow permeability behavior in complex structures of elastic multilayer woven fabrics using Darcy's law. This innovative approach expands the understanding of permeability in fabrics beyond single-layer fabrics with vertical pores or 3D fabrics used in resin injection processes.

Prediction of Yarn Quality Based on Actual Production

<p>In recent decades, the neural network approach to predicting yarn quality indicators has been recognized for its high accuracy. Although using neural networks to predict yarn quality indicators has a high accuracy advantage, its relationship understanding between each input parameter and yarn quality indicators may need to be corrected, i.e., increasing the raw cotton strength, the final yarn strength remains the same or decreases. Although this is normal for prediction algorithms, actual production need is more of a trend for individual parameter changes to predict a correct yarn, i.e., raw cotton strength increase should correspond to yarn strength increase. This study proposes a yarn quality prediction method based on actual production by combining nearest neighbor, particle swarm optimization, and expert experience to address the problem. We Use expert experience to determine the upper and lower limits of parameter weights, the particle swarm optimization finds the optimal weights, and then the nearest neighbor algorithm is used to calculate the predicted values of yarn indexes. Finally, the current problems and the rationality of the method proposed in this paper are verified by experiments.</p> <p> </p>

Life Cycle Assessment (LCA) of Worsted and Woollen processing in wool production: ReviWool® noils and other wool co-products

The textile and fashion industry is becoming increasingly active in measuring its environmental performance. As far as wool is concerned, there is quite abundant literature on environmental impacts available. However, previous studies very rarely distinguish between the different co-products of the wool transformation, and often attribute the same impact to fibers produced from worsted processing (longer and more expensive fibers) and woollen processing (shorter and cheaper fibers). This study firstly provides a detailed mapping of processes and products involved in the wool production chain, from sheep grazing to yarn production, with particular attention to the shorter fibers, which have been mostly neglected in previous literature. Secondly, this study uses the Life Cycle Assessment (LCA) methodology to analyze the environmental impacts of the different intermediate co-products. In particular, when multi-output processes occur, impacts are distributed proportionally to their relative economic value, using therefore an economic allocation. This approach enabled the calculation of environmental impacts of fibers used both in the worsted and woollen processing. It results that shorter fibers generally have lower impacts than longer fibers used for the production of fine yarns. Specifically, most short fibers have an impact on climate change ranging from 25 to 30 kg CO2 eq/kg, while, longer fibers have an impact of 78–97 kg CO2 eq/kg. The physiological variation in the ratio between worsted and woolen co-products of multi-output processes appears to have little effect on the final impact results. Finally, since the grazing phase is highly variable, impacts on climate change of the analyzed intermediate products have been re-calculated using, for the greasy wool, the lowest and highest values of impact found in literature. Impacts of the analyzed products vary sensibly according to the value considered for the greasy wool, but the relationship between them is rather stable.This paper contributes with detailed information and easily replicable data which could be used as a basis for the environmental assessment of wool garments and for improving the sustainability in the wool sector.

Quality of Fine Yarns from Modacrylic/Polyacrylate/Lyocell Blends Intended for Affordable Flame-Resistant Underwear.

Flammability testing of undergarments is a topic that is often overlooked and rarely on the list of textiles to be tested for fire safety. However, it is particularly important for professionals exposed to fire risk to investigate the flammability of underwear as its direct contact with the skin can be critical to the extent and degree of skin burns. This research focuses on the suitability of affordable blends of 55 wt.% modacrylic, 15 wt.% polyacrylate, and 30 wt.% lyocell fibres that have the potential to be used for flame-resistant underwear. The influence of modacrylic fibre linear density (standard and microfibres), ring spinning processes (conventional, Sirospun, and compact), and knitted structure (plain, 2:1 rib, 2:1 tuck rib, single pique, and triple tuck) on their properties required for thermal comfort in high-temperature environments was investigated. Scanning electron and optical microscopy, FT-IR spectroscopy, mechanical testing, moisture regain, water sorption, wettability, absorption, DSC, TGA, and flammability were tested to assess the desired suitability. The wetting time (5-14.6 s) and water absorption time (4.6-21.4 s) of the knitted fabrics have shown excellent ability to transport and absorb water compared to the knitted fabrics created from a conventional blend of 65% modacrylic and 35% cotton fibres. The afterflame and afterglow times of less than 2 s met the criteria for non-flammability of the knitted fabrics according to the limited flame spread test method. The results show that the investigated blends have the potential to be used for affordable flame-retardant and thermally comfortable knitted fabrics for underwear.

Determining the Permeability and Handle Properties of Wool, Yak and Cashmere Hand-knitted Fabrics

ABSTRACT Luxury fibers are used for their tactile properties, comfortable feeling for the users, and sometimes for status in society. These fibers are all protein-based and have always been compared to the properties of wool. Cashmere is known for its incredibly soft and warm yet lightweight and breathable qualities, making it a must-have fabric for any fall and winter closet. Besides labored and time-wasting cashmere production makes the fiber very expensive. Yak fiber is an alternative to expensive cashmere with similar properties, which costs only a quarter of cashmere. In this study, air and water vapor permeability properties, which are important for consumer comfort were investigated in addition to handle properties of the fabrics compared with the properties of the fabrics made of wool fibers. It was found that yarns made of wool fibers were easy to spin in fine yarn counts whereas yarns made of yak fibers were the coarsest. Hand-knitted fabrics made of cashmere fibers had the softest feeling even if the fabrics were produced with similar technical specifications. The permeability results of the fabrics were different, especially the porosity of the fabrics had a higher impact on the permeability of the fabrics.

Production of Long Hemp Fibers Using the Flax Value Chain

Hemp is finding a strong renewal of interest in the production of fine fibers for garment textiles. This resource of long-line fibers would come as a complement to the highly demanded flax fibers, whose large production in the north-west of Europe cannot be extended. In Normandy, where a complete industrial value chain exists for flax, it is intended to adapt it to hemp, and this was demonstrated from the field to the scutched fibers with a complete value chain. In this region, early harvesting is necessary to leave enough time for dew-retting and permit dry storage of stems before mid-September. An early-flowering variety (USO-31) was harvested using dedicated hemp equipment to obtain a 1 m parallel and aligned windrow that can be further processed by flax equipment. The scutching process as well as the fiber’s morphological and mechanical properties were particularly studied. Adapted scutching process parameters with reduced advancing speed and beating turbine velocity led to long fiber yields of about 18% of the stem mass. Stem yields were reaching about 6 tons/ha leading to a production of 1.1 tons/ha of long fibers. The tensile properties of the long fibers were highly sufficient for textile applications, and their thickness after hackling was in the range suitable for the production of fine yarns. Compared to other crops grown in Normandy, the hemp as produced in this 2020 case study provides good incomes to the farmer, higher than traditional crops such as wheat or barley, and the results of this study should encourage farmers to grow hemp for textile purposes.

Studies on thermal and moisture properties of novel Eri silk knitted structures

Purpose Eri is a short-stapled fibre that possesses an excellent soft feel and warmness to the wearer. Investigation of thermal comfort and moisture properties of Eri silk fabric provides the enhanced commercial scope for Eri silk-based clothing. Design/methodology/approach To examine the impact of process factors on thermal and moisture properties, three different single knit Eri silk structures were made, each with a different loop length and yarn count. Three different linear densities of Eri silk spun yarn (15, 20 and 25 tex) were selected. Three distinct knitted constructions, including plain jersey, popcorn and cellular blister, were created, along with two different loop lengths. Findings The novel cellular blister structure has shown appreciable thermal comfort properties than the other two structures. Yarn fineness and loop length were significant with most of the thermal comfort properties. Research limitations/implications In recent times the Eri silk production is completely domesticated, so the new demand can easily be met by the producers. This research will create a new scope for Eri silk fibres in sportswear and leisure wear. Originality/value This study was conducted to explore the influence of knit structure, loop length and yarn count on the thermal comfort properties of the clothing.