STUDY OF STRUCTURE AND RIGIDITY OF AIR-JET TEXTURED YARN(ATY)

This paper deals with the structure of air-jet textured yarn(ATY),especilly its core structurein dedail.It is described that overfeed of supply yarn does influence the ATY structure.Then thebending rigidity of ATY has been measured and analyzed.The results shows that various supplyyarns affect the core structure and bending rigidity of ATY.

Structure and Properties of Pure Cotton Low-Twist Single Yarn Based on Addition of Long-Staple Cotton

Pure cotton low-twist single yarn has good softness,bulkiness,and wearing comfort,but its lower strength makes the yarn break easily during the spinning process,which seriously affects the spinning effect and progress.The addition of long-staple cotton helps to increase the average length and uniformity of the raw fiber,thereby improving the breaking load and spinnability of pure cotton low-twist single yarn.In this study,the addition of long-staple cotton,the twist factor,and the twist direction were used as variables to spin 22 kinds of combed 14.6 tex pure cotton low-twist single yarn with spinnability,and the breaking load,the hairiness,and the unevenness of the yarn were tested.The result shows that the spinnability of pure cotton low-twist single yarn is mainly related to the breaking load,and with the increase of the twist factor,the breaking load of low-twist single yarn shows an obvious upward trend.When the proportion of long-staple cotton is 70%,the breaking load of low-twist single yarn is the largest,and the harmful hairiness index and unevenness of the yarn are significantly improved.

STUDY OF PET AIR-JET TEXTURING SEWING THREAD PROPERTIES

This paper presents a study of properties of air-jet textured threads made from high strengthpolyester filament and ordinary strength polyester filament.It includes the evaluation of tenacity,breaking elongation,modulus,specific work,evenness,abrasion resistance,hook strength,knotstrength and other mechanical properties relating to sewing.The polyester air-jet texturing sewingthread has special structure and appearance and possesses better properties of evenness,goodabrasion resistance,fatigue property,high hook and knot strength.

Yarn Properties Prediction Based on Machine Learning Method

Although many works have been done to construct prediction models on yarn processing quality,the relation between spinning variables and yarn properties has not been established conclusively so far.Support vector machines(SVMs),based on statistical learning theory,are gaining applications in the areas of machine learning and pattern recognition because of the high accuracy and good generalization capability.This study briefly introduces the SVM regression algorithms,and presents the SVM based system architecture for predicting yarn properties.Model selection which amounts to search in hyper-parameter space is performed for study of suitable parameters with grid-research method.Experimental results have been compared with those of artificial neural network(ANN)models.The investigation indicates that in the small data sets and real-life production,SVM models are capable of remaining the stability of predictive accuracy,and more suitable for noisy and dynamic spinning process.

REPORT ON A PROJECT AIMED AT INCREASING THE STRENGTH OF FRICTION SPUN YARN BY USING A FALSE TWIST PROCESS

The lower strength of friction spun yarns has became a key problem that hinder the develop-ment of friction spinning,especially in high speeds and fine yarns.In this paper a project aimed atincreasing the strength of friction spun yarns by using a false twist process has been made.In re-ported experiment false twist was inserted into the yarn which has been formed on a friction spin-ning machine,so that it made the yarn untwist at first,then regain the twist.In the meantime draftwas applied to generate more tension than that which had been experienced during yarn formationon the friction spinning machine.It made the yarn reforming and the loosely bound fibres in thefriction spun yarn formed due to extremely low tension on the friction spinning machine becametighter.Results indicate that with the proper draft,tension and false twist the tenacity of processedyarn will increase more than 10%.This project is an attempt to discover whether improvements can be made and whether it isworth pursuing research into modifications of yarn structure.The results imply that if the yarntension can be raised during yarn formation on the friction spinning machine or a chance is offeredto the yarn to reform after the yarn formation the yarn tenacity will be increased obviously.

TENSILE BEHAVIOUR OF ROTOR SPUN YARNS

This paper deals with the tensile behaviour of rotor spun yarns. Having regard to the spe-cial construction of rotor spun yarn, some modifications for Hearle’s theory have been made inorder to apply Hearle’ s theory to rotor spun yarn. The paper then goes into calculating thetensile curve and investigating the effect of main parameters and spinning conditions on thetensile behaviour of rotor spun yarn. It was found that the following facts are noteworthy forimproving the mechanical properties of rotor spun yarn: (1) Selecting suitable navel so as tocontrol the P. T. E. length within a reasonable range. (2) Improving the design of single fibresupply device to decrease the amount of spoiled fibre and hence increase the effective fibrelength. (3) Increasing spinning yarn tension without yarn break to enhance the fibre migrationratio. (4) For the rotor spun yarn of industrial use, it is the way to increase the yarn strengththat the rotor groove should be designed with the groove angle beneficial to decrease the yarnspecific volume.

RELATION BETWEEN STRUCTURE OF PP DRAWN FILAMENT AND TEXTURING EFFECT

The relationship between the structure of PP drawn filament and the crimp elasticity of tex-tured yarn is investigated.It is found that orientation,crystallinity,and especially,crystalline formof drawn filament are related to crimp property of textured yarn.Lower crystallinity,moderateorientation and unstable para-crystalline structure are necessary for increasing crimp elasticity.Inaddition,the filament structure and properties before and after texturing are compared.

The Behavior of the Rotor Spun Yarn(OE yarn)with Involving Twist

The rotor spun yarn(OE yarn),twist of which is calledlayering twist,was added a few involving twist,and itsstructure and properties were measured.The experimen-tal results have shown that the morphological structure ofthe rotor spun yarn with modified twist was changed andits tensile properties and abrasion resistance were im-proved.

Mathematical Characterization of Twisted Yarn

Twist leads to yarn torsion, which influences the physical and mechanical properties of yarn or fabric directly. In this paper, according to the basic principle of space geometry, the space geometric model of yarn was established, then the linking number,twisting number, and writhing number of elastic rod model were defined. The reason of yarn snarling was analyzed based on the energy, and the relation between yarn snarling and yarn torsion was studied according to White formula. The results show when tow ends of yarn are fixed, the linking number is constant, which means the sum of twisting number and writhing number for yarn torsion deformation and bend deformation is constant.

The Influence of Fabric Structural Parameters on Dust Retention Using a Simple, Newly Constructed Device

This article has been directed to Environment Protection Technology with the purpose of providing a new instrument designed and developed to measure filtration efficiency through the relationship between clean cloth fabric structural parameters, dust parameters, and test measuring variables. Fabric samples used throughout the present study were woven cotton 100%, polyester 100% and cotton/polyester 50/50%. The warp count: 30/2 for all fabric samples, the weft count is 9/1;12/1;and 20/1. The weave of satin, basket, and twill is 3/1 with four different picks/cm to produce the fabrics with the same cover factor. For dust separation fabrics range in weight from “300 - 450 g/m2” with an air permeability of “100 - 300 l/d m2·min” at “196.2 Pa” (20 mm WG) as specified in DIN 53887. Air permeability through fabrics depends entirely on the sieving percent of the surface of the fabric, which is partly the pores and partly the permeability through the yarns, which are the basic elements of a fabric. The results showed that dust capturing depends entirely on air permeability, which is related to fabric weave structure and fabric material at specified testing and measuring variables.

Modeling and analysis of the compact spinning yam structure by interference

The fiber stress and elongation after the yam twisting has been analyzed in this paper. A method has been proposed to improve the strength of compact spinning yam. A structure model of the interference compact spinning yarn was established. It theoretically proves that interference compact spinning yarn has higher strength than that of traditional compact spinning yarn.

Studies of the Mechanical Properties of Viscose Wrapped Spandex Yarn

In this paper ,we can learn the performance of viscose wrapped spandex yarn through several aspects ,including yarn strength, elastic recovery rate and boiling shrinkage.If we grasp these structure characteristics, we can spin out the best yarn that we need.

一维结构柔性应变传感器在智能纺织服用品中的应用进展

一维结构柔性应变传感器具有优异的可集成性、适形性和灵活的结构变化等特点,在智能纺织服用品的开发与应用方面具有很大潜力。通过对纤维和纱线制备一维结构柔性应变传感器的工艺及其优缺点的介绍,综述近年来纤维型和纱线型一维结构柔性应变传感器在智能纺织服用品设计与应用中的研究进展,分析其在智能可穿戴应用领域中存在的问题。研究表明,一维结构柔性应变传感器在智能纺织服用品中的应用前景广阔,未来研究人员可不断优化和提升传感器的性能和制备工艺,推动一维结构柔性应变传感器在智能纺织服用品的实际应用。

玄武岩复合纱线的制备及强伸性能分析

为探究玄武岩复合纱线的强伸性能,分别制备了芯纱为单股、双股的玄武岩包覆纱,分析了玄武岩单股无捻结构芯纱包覆纱、玄武岩双股加捻结构芯纱、玄武岩双股无捻及加捻结构芯纱包覆纱在不同条件下的强伸性能变化规律。研究表明:以单股玄武岩为芯纱,外包不同种类材料如芳纶、超高分子量聚乙烯、锦纶及其复合纱时,纱线的强伸性能变化规律不同;以双股玄武岩为芯纱,复捻锭速在750 r/min且捻度为50捻/m时,芯纱强伸性能稳定,是合适的加捻参数;玄武岩双股加捻结构芯纱包覆纱强力较高,且随着包覆捻度的增大,其断裂强力变化明显小于双股无捻结构芯纱包覆纱。

新型抗菌喷气涡流纺纱线的研究

利用当前纺织领域先进的喷气涡流纺技术,将抗菌性能良好的海藻纤维与黏胶纤维进行混纺,获得了力学性能良好且兼具抗菌性能的纱线。对该具有抗菌功能的喷气涡流纺纱线进行分析,研究其纱线结构、性能和应用前景。测试与分析结果表明:相比普通环锭纺纱线,该纱线强度稍低;毛羽非常少,且基本都为短毛羽;纱线具有抗菌等优良性能。

仿牛仔成衣水洗效果针织成形编织工艺设计

针对传统牛仔水洗工艺污染性较强、舒适度不高等问题,提出仿牛仔成衣水洗效果针织成形编织工艺设计和应用的必要性。首先梳理牛仔水洗工艺,并按照其所呈现的外观效果进行分类。以该分类为依据,结合针织组织结构和纱线选择,对仿牛仔成衣水洗效果的针织成形编织工艺进行技术实践。最后阐述上述针织工艺在仿制经典牛仔服装款式以及在针织成形服装经典款式中应用的可行性。该研究是在环保可持续的大主题下,对牛仔风格服装设计与工艺的有益探索。

芳纶纱的结构形貌对芳纶/PTFE织物复合材料摩擦学性能的影响

为了研究纱线结构形貌对织物复合材料摩擦学性能的影响,选用对位芳纶纤维,制备成3种具有不同结构形貌的芳纶纱,分别为长丝平行纱、长丝加捻纱和短纤维加捻纱。以相同的制备工艺得到3种芳纶/PTFE织物复合材料,采用多试件摩擦磨损试验机测试复合材料的摩擦学性能,并对芳纶/PTFE混编织物及相应复合材料的结构形貌、力学性能和磨损表面进行分析与探讨。实验结果表明:芳纶纱的结构形貌可直接影响纱线的断裂强度、纱线拔出强力、纱线与树脂的界面结合力,进而影响织物复合材料的摩擦学性能;在不同的磨损条件下3种混编织物的耐磨性表现有所不同,当载荷相对较低时,芳纶短纤维加捻纱/PTFE织物复合材料磨损率更低,而当载荷较高时,芳纶长丝加捻纱/PTFE织物复合材料耐磨性更好。

短纤维成纱结构演化与创新

为了进一步理解捻合机制与纱线结构的关系,开发出理想结构纱线,综述了不同纺纱技术的纺纱原理、捻合机制、纱线结构、纱线性能,分析了不同纱线结构的优缺点,进一步阐明了捻合机制对纱线结构的影响以及纱线结构与纱线性能之间的关系,总结了理想纱线结构具有的特点,展望了未来纱线结构的发展趋势。捻合机制的差异导致纱线结构不同,纱线结构影响着纱线品质,为了进一步提升纱线品质,应从创新捻合机制的角度出发,以开发出理想结构纱线。

编织芯鞘型摩擦发电传感纱的结构参数对其性能的影响

为满足人体呼吸运动日常长时监测的需要,设计了一种可拉伸编织芯鞘型摩擦发电传感纱,探究拉伸电极包缠捻度和编织层等结构参数对传感纱性能的影响。结果显示:增加可拉伸电极包缠捻度,传感纱的弹性伸长率随之增大,弹性回复率和短路电流减小;传感纱弹性回复率主要受编织角影响,电学性能受编织参数多效应影响,当编织根数为10、编织角为45°时获得最大的短路电流;该传感纱在0.15~1.20 Hz频率范围内随接触分离过程实时响应,并在2000次循环运动过程中有良好的输出稳定性;将传感纱佩戴在人体腹部时能对不同的呼吸状态产生响应。测试结果表明,该编织芯鞘型摩擦发电传感纱可用于人体呼吸状态监测,对摩擦电式呼吸监测传感器的生产具有一定的借鉴意义。