基于sirofil-spun新型花式纱的纺制及性能分析

基于sirofil-spun新型花式纱的纺纱方法,阐述了新型sirofil-spun的纺纱原理即对sirofil-spun和嵌入式纺纱的结合原理,在QFA1528细纱机上进行改装,开创出sirofil-spun新技术,纺制出新型的花式纱。在保证纺纱工艺参数及纱线中长丝和短纤维含量相同的情况下,分别纺制150 dtex/66.7dtex/66.7 dtex新型sirofil-spun花式纱与普通sirofil-spun花式纱,并对其强伸性能、条干、毛羽指标进行了测试和对比分析,同时利用MDA1300视频显微镜和YG172型纤维切片器进行观察并进行纱线纵、横向结构分析。研究结果表明:纱线的纵、横截面中,三种花色呈螺旋型外观,表面光洁,结构稳定;对于相同线密度的花式纱,新型sirofil-spun花式纱的断裂强度和断裂伸长率高于普通sirofil-spun花式纱,条干和毛羽水平也优于普通sirofil-spun花式纱。

三种不同工艺条件对新型sirofil-spun三色花式纱外观与成纱质量的影响

探讨三种不同工艺条件对新型sirofil-spun三色花式纱外观与成纱质量的影响。采用新型sirofil-spun纺纱方法即对sirofil-spun和嵌入式纺纱原理的结合,并且在三种不同工艺条件下,通过改变粗纱与长丝的相对位置,即粗纱靠左侧长丝、粗纱在两根长丝之间和粗纱靠右侧长丝,形成不同的成纱方式纺制出新型的三色花式纱;利用i-speed高速摄影机和MDA1300视频显微镜对所纺出花式纱的外观进行观察与分析,并且对三种花式纱线的强伸性能、条干、毛羽进行对比分析。研究结果表明:三种不同工艺条件下会形成不同的成纱加捻机理,纺成花式纱的三种色彩产生不同的排列;粗纱靠近左侧长丝喂入的成纱方式所纺三色花式纱的成纱质量较好。

微纳米纤维包芯纱制备及其电致发光性能

为解决纤维基电子显示器件多层结构制备的难题,采用一步法制备聚偏氟乙烯(PVDF)/ZnS:Cu^(2+)/镀银锦纶包芯纱,即将镀银锦纶作为芯纱,PVDF/ZnS:Cu^(2+)作为皮层,采用共轭静电纺丝技术在镀银锦纶上包覆发光层,并对其各项性能进行测试与表征。讨论了PVDF与ZnS:Cu^(2+)无机发光颗粒质量比对包芯纱可纺性及其各项性能的影响。结果表明:在PVDF/ZnS:Cu^(2+)/镀银锦纶包芯纱中,ZnS:Cu^(2+)颗粒通过PVDF微纳米纤维的物理缠结作用包覆在镀银锦纶上;在PVDF与ZnS:Cu^(2+)质量比为1∶4时,ZnS:Cu^(2+)在纱线中负载量最大;在0.0075 V/μm、2 kHz交流电激发下,包芯纱亮度达到3.30 cd/m^(2),4 h内变化小于10%;包芯纱的断裂强度为16.718 MPa,断裂伸长率为46.588%,弯曲刚度为0.026 cN·cm^(2),具有较好的柔性和可穿戴性,在制备可穿戴柔性显示器上具有较好的应用前景。

纺纱工艺对色纺纱呈色的影响研究

为解决色纺纱在纺制和使用过程中出现的色差较大、色差产生具体原因不清楚等问题,结合国内外最新研究成果,分析了色纺纱呈色机理,重点总结了纤维的混和方式与纺纱工序两个重要因素对色纺纱呈色的影响,提出未来色纺纱呈色影响因素需研究的内容。结果表明:采用不同的纤维混和方式,均会对色纺纱呈色效果造成影响;在相同的加工方法下纱线捻度、线密度的不同也会导致一定的色差;环锭纺、转杯纺和喷气涡流纺等不同的成纱方式纺制的色纺纱存在色差。指出:可对细纱与纤维网、熟条、粗纱之间色差出现显著变化的机理进行探究;对不同种类的有色纤维进行混纺时,纺制出与标准样色差最小的纱线所用的纤维混和方式进行研究;研究织造方式对色纺织物造成的色差;探究不同种类染料对色纺纱呈色的影响,以便更好地控制色差。

Prediction of Rotor Spun Yarn Strength Using Adaptive Neuro-fuzzy Inference System and Linear Multiple Regression Methods

This paper presents a comparison study of two models for predicting the strength of rotor spun cotton yarns from fiber properties. The adaptive neuro-fuzzy system inference （ANFIS） and Multiple Linear Regression models are used to predict the rotor spun yarn strength. Fiber properties and yam count are used as inputs to train the two models and the count-strength-product （CSP） was the targel. The predictive performances of the two models are estimated and compared. We found that the ANFIS has a better predictive power in comparison with linear multiple regression model. The impact of each fiber property is also illustrated.

The Influence of Elimination of Roving Frame on Ring Spun Cotton Yarn Characteristics

Generally, ring spun yarns are manufactured from roving which is produced by roving frame. In this paper, an experiment has been done producing ring spun cotton yarn directly from finisher drawn sliver eliminating the roving frame. Total 3 types of yarn with the various linear density of 8 Ne, 10 Ne & 12 Ne were produced using a roving frame and without using a roving frame. In the next step, physical and mechanical properties of those yarns including unevenness, imperfections, hairiness & tenacity were investigated. The result showed that ring spun cotton yarns produced from sliver exhibited inferior physical and mechanical properties compared with samples from the conventional ring spinning system.

Structure and magnetocaloric effect in melt-spun La(Fe,Si)_(13) and MnFePGe compounds

The magnetocaloric properties of melt-spun La(Fe,Si)13 and MnFePGe compounds were investigated. Very large value of magnetic entropy change ｜ΔS｜=31 and 35.4 J·(kg·K)-1 under 5 T were obtained at 201 K in LaFe11.8Si1.2 melt-spun ribbons and at around 317 K in Mn1.1Fe0.9P0.76Ge0.24 melt-spun ribbons, respectively. The large magnetocaloric effect results from a more homogenous element distribution related to the very high cooling rate during melt-spinning. The excellent MCE properties, the low materials cost and the accelerated aging regime make the melt-spun-type La(Fe,Si)13 and MnFePGe materials an excellent candidate for magnetic refrigerant applications.

Microstructures of Ti-48%Ni shape memory melt-spun ribbons

The effect of wheel speed on microstructures of Ti-48%Ni (mole fraction) melt-spun ribbons was investigated by X-ray diffractometry, scanning electron microscopy and transmission electron microscopy. When the wheel speed is 26 and 42 m/s, the as-spun ribbons are completely crystallized to the Ti-Ni B2 phase. The Ti-rich plate precipitates lying on {100} planes are observed in the as-spun ribbon fabricated with a wheel speed of 26 m/s. The spherical Ti2Ni precipitates are observed at grain boundaries in the as-spun ribbons fabricated with a wheel speed of 42 m/s. Amorphous and B2 phases coexist in the as-spun ribbon fabricated with a wheel speed of 52 m/s. The uniformity of grain size in heat treated ribbons decreases with increasing wheel speed.

Magnetoresistance and exchange bias in high Mn content melt-spun Mn_(46)Ni_(42)Sn_(11)Sb_1 alloy ribbon

Highly textured Heusler alloy Mn_（46）Ni_（42）Sn_（11）Sb_1 ribbons were prepared by melt spinning. The annealed high Mn content Mn46Ni42Sn11Sb1 ribbon cross-section microstructure, crystal structure, martensitic transformation（MT）, and magnetoresistance（MR） properties were investigated. The MR in the annealed ribbon was assessed by the magnetic field direction perpendicular to the ribbon surface with the magnetic field up to 30 k Oe. The large negative value of 25% for MR was obtained at 244 K. The exchange bias（EB） effects of the as-spun and annealed ribbons were investigated. After annealing, the EB effects have been improved by about 25 Oe at the temperature of 50 K. The magnetizations have increased approximately by 10% more than the as-spun ribbon.

Fibrillation Properties of Solvent - spun Cellulose Fiber

In this paper, fibrillation properties of solvent - spun cellulose fiber and some influencing factors are analyzed based on the experiment results. It is pointed out that special textile styles and aesthetic appearance could be obtained by controlling the fibrillation.

A Study of the Behaviour of Denim Cloth Made from Modified Rotor Spun Yarn

This paper described the physical behaviour of three types of denim cloths produced from rotor yarn, ring yarn and modified rotor yarn (prepared by adding conventional twist to rotor yarn) respectively. Experimental work showed that denim cloth produced from the modified rotor yarn has superior properties over conventional rotor yarn in terms of surface texture and appearance,tearing strength and resistance to abrasion.

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.

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.

Model to Study Resin Impregnation Process of Premix Made of Friction Spun Core Yarn

A model was deveIoped to investigate impregnation behavior of thermoplastic resin into filament bundle based on Darcy's law. Consolidation processes of unidirectional laminate were performed to evaluate the validity of the model. Friction spun core yarns were used in the experiments with polypropylene fiber sheath and glass filament core. The processing conditions, such as temperature and pressure, and filament parameters were taken into consideration. A good agreement was found between theoretical prediction and experiment data.

Crystallization behaviour and high coercivity of (Nd,Pr)_(13)Fe_(80)Nb_1B_6 melt-spun ribbons

Amorphous （Nd,Pr）13Fe80Nb1B6 ribbons were crystallized at 670-730°C for 5-25 min to study the effects of isothermal crystallization on their behavior and magnetic properties. XRD results indicate that the isothermal incubation time is 12, 5, and less than 5 min at 670, 700, and 730°C, respectively. High coercivities, with the maximum value of iHc = 1616 kA/m at 700°C for 19 min, measured by a physical property measurement system, are obtained in the crystallized ribbons. This is mainly attributed to the addition of Pr and Nb, because Pr2Fe14B has a higher anisotropic field than Nd2Fe14B, and Nb enriched in the grain boundary regions can not only reduce the exchange-coupling effects among hard grains, but also impede grain growth during the crystallization process. In addition, it should also be related to the characteristics of the furnace that the authors designed.

THE EFFECTS OF ULTRA DRAWING ON THE CRYSTAL STRUCTURE OF GEL SPUN POLYETHYLENE FIBERS

It is believed that gel spun polyethylene(PE)fibers have a somewhat extended chain crystalstructure,because of the disentangling of the chains which takes place in semi-dilute solutionand the ultra high draw ratio used.Ten years ago,PE shish-kebabs grown from dilute solutionwere proved to have extended chain backbone which causes the raising of its melting point.These crystals were found to have a triclinic crystal phase,This study shows a different result forgel spun ultra high drawn PE fiber.The unit cell remains orthorhombic even if the draw ratioreaches 50;as the draw ratio increases,the length in a and b axes are shortened while that in c ax-is changes quite insignificantly.When the draw ratio is over 10,two endothermic melting peakscan be seen in the DSC curves with corresponding peak temperature of 136.7-145.3℃.The lat-ter peak is attributed to the amount of extended chain crystal.

EFFECTS OF NITRIDING TEMPERATURE ON MAGNETIC PROPERTIES OF MELT-SPUN Pr1.4Fe10.5Mo1.5Nx AND ITS PHASE ANALYSIS

ＥＦＦＥＣＴＳＯＦＮＩＴＲＩＤＩＮＧＴＥＭＰＥＲＡＴＵＲＥＯＮＭＡＧＮＥＴＩＣＰＲＯＰＥＲＴＩＥＳＯＦＭＥＬＴＳＰＵＮＰｒ１．４Ｆｅ１０．５Ｍｏ１．５ＮｘＡＮＤＩＴＳＰＨＡＳＥＡＮＡＬＹＳＩＳ①ＺｈａｎｇＳｈｅｎｇｅｎ１，２，ＺｈａｎｇＪｉｕｘｉｎ...

Effects of electrochemical oxidation on surface and mechanical properties of dry-jet wet spun carbon fibers

The surface of dry-jet wet spun carbon fibers(CFs)is relatively smooth compared with those of wet spun CFs,which results in weak interfacial interactions between the fiber and the polymer resin.A surface functionalization treatment is particularly important to unleash the full potential of the superior mechanical properties of dry-jet wet spun CFs.In this study,the effects of electrochemical oxidation treatment time and current density on the surface structures and the mechanical properties of dry-jet wet spun CFs were investigated.The interlaminar shear strength of the CFs improves significantly from 69 to 84 MPa after 120 s of treatment.Further structural analysis reveals that the improvements are due to the addition of oxygen-containing functional groups and the optimization of the morphology on the surface of the CFs.

TPNR Membrane Reinforcing with Cotton Fibre Spun

Reinforcement of TPNR （thermoplastic natural rubber） with cotton fibre spun was prepared by using hot compression moulding. The TPNR was prepared by mixing NR （natural rubber） with PE （polyethylene） using 2-roll mills before compressed on cotton fibre spun and vulcanized at 150℃. The mechanical properties and morphology of the membrane were investigated using DMTA （dynamic mechanical thermal analyzer） and SEM （scanning electron microscopy）, respectively. The membrane strength was increased from 10 MPa to 18 MPa after reinforced with cotton fibre spun as well as the increasing of dielectric constant. The membrane was immersed in xylene to remove PE phase before characterization of membrane properties.

Study on the Rotor Spinning Processing of Spun Silk/Cashmere Blended Yarn

This paper studies rotor spinning blended yam produced of spun silk and cashmere. Nine samples were spun, from three different opening rollers and different navels. According to the Uster test results of yam quality properties, optimum selection is done by using analysis method of combining fuzzy decision-making and fuzzy pattern classification. Experimental plan is designed based on universal rotated experimental design, and the method of confined optimization is used to optimize the speed of opening roller, the speed of rotor and twist factor, according to the results of yam quality test by Uster.