Table of Content

15 February 2018, Volume 39 Issue 02

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High piezoelectric flexible electrospun zinc oxide/poly(vinylidene fluoride) composite fibrous membranes

JOURNAL OF TEXTILE RESEARCH. 2018, 39(02):  1-6.  doi:10.13475/j.fzxb.20171002606

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In order to obtain eco-friendly, flexible, permeable and piezoelectric materials and to widen applications thereof in nanogenerators, sensors and wearable electronic devices, the high piezoelectric ZnO/PVDF composite fibrous membranes were successfully prepared by electrospinning. The morphology, structure and piezoelectricity of samples were characterized by the scanning electron microscope, attenuated total reflectance fourier transform infrared spectroscopy, X-ray diffraction and oscilloscope. The results demonstrate that the addition of appropriate contents of zinc oxide nano-particles (ZnO NPs) in PVDF fiber matrix contributes to improving crystallinity and electroactive β cuystal form concentration of PVDF fiber to some extent, leading to the increase of the total crystal form of PVDF. Meanwhile, ZnONPs have piezoelectricity, which further enhances the piezoelectric performances of the composites. The output voltage of the ZnO/PVDF composite fibrous membranes are improved dramatically. The output voltage of the composite membrane is up to 60V when the content of ZnONPs is 30%, which is increased by 200% in comparison with pure PVDF fibers.

Oil absorption property of electrospun superfine fibrous membrane

JOURNAL OF TEXTILE RESEARCH. 2018, 39(02):  7-13.  doi:10.13475/j.fzxb.20171005307

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In roder to solve the low oil absorption problem of comventional fibrous oil sorption mats, the polysulfone (PSF) and polylactic acid (PLA) superfine fibrous membranes were prepared by electrospinning to increase the oil absorption capacity of fibrous adsorption maerials. The influence of morphology structure of fibers, pore structure, oleophilicity and hydrophobicity of the fibrous membranes on oil absorption and oil retention wrer studied. The results show that the PSF and PLA superfine porous membranes have excellent oleophilicity and hydrophobicity, while the fiber diameter, pore diameter and porosity between fibers, oleophilicity and hydrophobicity, and volume expansion degree of membranes after oil absorption bave great influence on oilabsorption capacity. The mesopores (2 ~ 60 nm) on the surface of dibers have no obvious influence on improving the oil absorption. However, the high porosity and through-out pores of membranes do not facilitate oil retention. When the membranes contact with oil for 1 h, the oil absorption capacity of PLA membranes is 50.1 g/g for pump oil and 34.6 g/g for linseed oil, while the oil absorption capacity of PSF membranes is 147.8 g/g for pump oil and 131.3 g/g for linseed oil. The oil retention of PLA membranes is decreased by 42.04% for pump oil and 53.69% for linseed oil, while the oil retention of PSF membranes is decreased by 62.17% for pump oil and 50.61% for linseed oil, after natural draining for 1 h.

Electrospun barium titanate/ poly(vinylidene fluoride) nano-composite flexibility piezoelectric fibrous membranes

JOURNAL OF TEXTILE RESEARCH. 2018, 39(02):  14-19.  doi:10.13475/j.fzxb.20171002406

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In order to further improve the piezoelectric properties of poly(vinylidene fluoride) (PVDF), barium titanate (BaTiO3) nanoparticles with ferroelectric properties were used as inorganic fillers in the PVDF matrix, and BaTiO3/PVDF nano-composite fibrous membranes were prepared by electrospinning method. The structures and properties of BaTiO3/PVDF fibrous composites were characterized by scanning electron microscopy, attenuated total reflection fourier transform infrared, differential scanning calorimetry, X-ray diffraction, impulse voltage test. The influences of BaTiO3 on the crystalline structures and piezoelectric properties of fibrous composites were also investigated. The results show that both the electrostatic stretching during the electrospinning process and the nucleation function of BaTiO3 nanoparticles are beneficial to promote the formation of PVDF β phase.  When the addition of BaTiO3 is 10%, the content of β phase of fibrous composites is 90.8% and the output voltage of fibrous composites in creases from 20 V to 50 V. The prepared BaTiO3/PVDF nano-composite fibrous membranes have good piezoelectric properties.

Continuous preparation and properties of conductive polyester/polyaniline composite yarns

JOURNAL OF TEXTILE RESEARCH. 2018, 39(02):  20-25.  doi:10.13475/j.fzxb.20170906806

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In order to improve the conductivity of polyester (PET) fiber, a novel method based on in-situ polymerization of aniline for the continuous preparation of conductive yarn was presented, and conductive polyester/polyaniline (PET/PANI) composite yarns were prepared by this method. The influence of parameters of conductive treatment such as concentration of oxidant, doping acid and aniline and processing speed on the electrical conductivity of composite yarns was discussed, and the morphological structure, chemical structure, thermal-gravimentric performance and mechanical properties were also studied. The results indicate that the substrate yarns are coated and filled with conductive PANI. The concentration of reaction mixtures and processing speed greatly affect the conductivity of conductive PET/PANI composite yarns, and the conductivity can reach above 1.5 S/cm. The thermostability of the treated yarns is decreased due to the existence of PANI. Compared with the substrate yarn, the breaking strength and breaking elongation of the treated yarns are increased slinghtly while the initial modular decreases greatly.

Structural formation mechanism of multiple condensed spun yarn and properties of knitted fabric thereof

JOURNAL OF TEXTILE RESEARCH. 2018, 39(02):  26-31.  doi:10.13475/j.fzxb.20171001506

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In order to solve the problems on hard conversion from convenitional ring hairy yarn to knitted fabric, high rigidity for fabric made of conventional compact smooth yarns, a tandem half-open type multiple condensed spinning method was proposed, then the spinning principle and yarn formation mechanism thereof were theoretically analyzed. The theoretical analysis results indicated that the multiple condensed spun yarn is featured with tight outer layers and soft interior structures. Based on the theoretical analysis, conventional ring, conventional compact and multiple condensed spun yarns were used to produce knitted fabrics with the same machine and knitting parameters, respectively. The knitted fabrics were comparatively investigated in terms of compression resilience, air permeability, moisture permeability, pilling resistance, wear resistance and dyeing performance, respectively. The results moisture permeability and pilling resistance after the comparison with conventional ring yarn fabrics. The fabric drapability, compression resilience and dyeing ability of multiple condensed spun yarns are much better than those of conventional compact yarns.

Simulation of fiber trajectory in jet vortex spinning based on finite element model

JOURNAL OF TEXTILE RESEARCH. 2018, 39(02):  32-37.  doi:10.13475/j.fzxb.20170906306

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In order to simulate the trajectory of the free-end fiber during the air flow twisting process of jet vortex spinning, the finite element model of the fiber was established based on the elastic thin rod element, combined with the moving characteristics of the flexible free-end fiber. According to the air pressure and velocity distribution in the airflow twisting chamber of jet vortex spinning, the finite element kinetic differential equation of the free-end fiber was established. Then following the principle of mechanical equilibrium, energy conservation, mass conservation and momentum conservation, the undetermined coefficients of the finite element kinetic differential equation of the free-end fiber was analyzed. Then based on the numerical simulation, the trajectory of the free-end fiber was acquired. Finally, the theoretical result of the free-end fiber trajectory by finite element simulating was tested by the tracer fiber method. The results show that the finite element model based on the elastic thin rod element is feasible and effective for simulatin fiber trajectory in jet vortex spinning.

Garment model and process realization of warp-knitting fully fashioned sportswear

JOURNAL OF TEXTILE RESEARCH. 2018, 39(02):  38-42.  doi:10.13475/j.fzxb.20170803605

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In order to establish the efficient and normative method for the design of warp-knitted fully-fashioned sportswear, based on the study of the forming structure principle of the classification and style of the warp-knitted fully-fashioned sportswear, and by combined with the principle of tube-knitting of warp knitted fabric, the 2-D coat and trousers prototype model were established by extracting the feature points, feature lines and feature surface information from parametric human model. The process calculation method for warp-knitted fully-fashioned sportswear was summarized as well. Taking the warp-knitted fully-fashioned sports vest style as an example, the mathematical modeling method of the warp-knitted fully-fashioned sportswear model was described, which was used to guide the development of the warp-knitted fully-fashioned CAD software, and the design process of the sport vest model was realized by the color block division and the Jacquard stitchfilling, which provided a new effective way for the rapid development of new style design for the warp-knitted fully-fashioned sportswear.

Finite element analysis of curved multi-axial warp-knitted composite car door under low-velocity impact

JOURNAL OF TEXTILE RESEARCH. 2018, 39(02):  43-48.  doi:10.13475/j.fzxb.20171006206

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In order to study the impact resistance of curved multi-axial warp-knitted composite automobile shells, the finite element analysis was adopted for the simulation analysis on the low-speed impact resistance of car door of a passenger vehicle adopting the composite material. An SAPH440 steel car door was utilized as the comparative item. Stress distribution, penetration, penetration velocity and internal energy of the car doors were analyzed. The results show that compared with the SAPH440 steel car, the curved multi-axial warp-knitted composite car door shows smaller deformation but higher energy absorption, enhancing the protection on persons in the car to same extent. Furthermore, the composite material provides better safety and less weight.

Tesile properties of carbon-aramid hybrid 3-d braided composites

JOURNAL OF TEXTILE RESEARCH. 2018, 39(02):  49-54.  doi:10.13475/j.fzxb.20171000206

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In order to analyze the tensile property and failure mechanism of 3-D braided composites, three-dimensional five-directional (3D5d) and three-dimensional six-directional(3D6d) hybrid braided composites with carbon fibers and aramid fibers as axial and braiding yarns were designed and manufactured. A digital Image correlation (DIC) technique was used to record the surface full-field strain distribution of samples during tensile loading. At the same time, the Poisson’s ratios was also obtained by DIC. The test results show that Poisson’s ratio is mainly influenced by braided architecture. For the same braided architecture, the carbon-aramid  hybrid 3-D braided composites with carbon fiber as axial yarn maintain the tensile strength and modulus of carbon 3-D braided composites, while the ultimate tensile strain is higher than that of carbon -3D braided composites. the carbon-aramid hybrid 3-D braided composites with aramid fiber as axial yarn significantly improve the ultimate tensile strain of the composites, but seriousily losed the tensile strength and modulus of the composites. For the same hybrid braided structure, the tensile strength and modulus of 3D5d were higher than those of 3D6d. The ultimate tensile strain of 3D5d and 3D6d show few differences. The high strain regions of hybrid braided composites (axial yarns are aramid and carbon fibers, respectively) are appwoximately lattice and wave line distribution, respectively. The high strain regions of 3D5d and 3D6d are distributed uniformly and transversely, respectively.

Simulation on fiber motion in airflow field of transfer channel

JOURNAL OF TEXTILE RESEARCH. 2018, 39(02):  55-61.  doi:10.13475/j.fzxb.20171001707

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In order to the fiber configuration in the airflow of the rotor spinning channel, especially the transfer channel, which has a great influence on the rotor spun yarn properties. The airflow characteristics in the rotor spinning channel were obtained by numerical simulation, then the fiber dynamical equations were developed. The motion of straight and leading hooked fibers in the transfer channel were discussed. The simulation results shwo that vortices exist at the transfer channel inlet, and the distribution of the air velocity in the transfer channel cross section is uneven, and the air velocity in the transfer channel center is higher than that near the wall, however, the air velocity is increasing from the transfer channel inlet to the outlet. The fiber tends to move along the transfer channel center which has higher air velocity. The accelerating air helps the straight fiber to maintain its form and straighten the hooked fiber. The time to straighten the hook increases with the increasing of the bending degree, while increasing the air velocity in the transfer channel is conducive to decrease the time.

Analysis on properties of gradient yarns spun by three-channel digital ring spinning

JOURNAL OF TEXTILE RESEARCH. 2018, 39(02):  62-67.  doi:10.13475/j.fzxb.20170709006

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Aining at the problems of less research on the gradient colored yarn at home and abroad, and incapability of realizing the accurate control of yarn surface color and segmentation length during the production process, the mechanism of the control on the blending ratio by three-channel digital ring spinning drawing was studied. The forming principle of gradient colored yarn having the color gradient characteristics of hue, brightness and purity and spun from three rovings of magenta, yellow and green was analyzed, which were fed by three channels and drafted in gradient ratios. The sample gradient colored yarn is 27.76tex and has 10% color gradient of magenta, yellow and green. The appearance, yarn evenness and tensile mechanical properties of the sample gradient colored yarn were studied. The results show that the control on the blending ratio of magenta, yellow and green rovings by the three-channel digital ring spinning gradient draft achieve the color gradient characteristics of the gradient yarn. The breaking strength and yarn evenness of the gradient yarn are slightly lower than those of pure colored yarn, with the same specification.

Evaluation of dynamic tension of warp knitting yarn

JOURNAL OF TEXTILE RESEARCH. 2018, 39(02):  68-72.  doi:10.13475/j.fzxb.20170302405

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Aiming at the lack of evaluation method of dynamic tension of warp knitting yarn obtained by high frequency testing instrument, an index, i. e. , the probability density curve and kurtosis, skewness used to evaluate the overall fluctuation of warp knitting yarn tension was proposed. In order to test the feasibility of the index, warp yarn tension within 30 s under five different machine speeds were tested by high frequency testing instrument. The probability density curve and kurtosis and skewness were used to analyze the tension data. The research results show that the krutosis of warp yarn tension under five different machine speeds are smaller than 0, and the skewness are greater than 0. The kurtosis and skewness decline with the increase of machine speed. Combine with the probability density curve, the research results show that with machine speed increase, the fluctuation of yarn tension decrease, which means yarn tension is more balanced. The results verify the feasibility of this evaluation method because it’s consistent with the actual knitting situation.

Strain-resistance sensing property of warp knitted conductive fabrics

JOURNAL OF TEXTILE RESEARCH. 2018, 39(02):  73-77.  doi:10.13475/j.fzxb.20170804405

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In order to investigate the silver-resistance sensing performance of warp -knitted conductive fabrics silver-plated nylon and spandex or polyester were ured to knit four different fabric structure samples on the tricot warp knitting machine. These four samples were characterized by varied knit strures and elasticity. The change in resistance in the four of fabric samples under tensile condition had been recorded. Analyses of the influence of the microstructure and elasticity proffered by spandex content on the strain-resistance sensing properties had been analyzed. The results show that the silver-plated nylon conductive yarns employed possess good knittability. The resistance of the inelastic warp-knitted fabrec decreases with the application of strain. The piezoresistive response shows an initial declining in resistance, following by a smooth momentum and then acconpaning by an upward transition. The sensitivity increases under small strain. Conversely, the resistance of the elastic warp-knitted conductive fabric increases with the increase of strain at the beginning and then tends to stabilize midway and then reduce in the final phase.  

Control of physical and chemical properties of oxidation degummed ramie fiber with 1, 8-dihydroxyanthraquinone

JOURNAL OF TEXTILE RESEARCH. 2018, 39(02):  78-85.  doi:10.13475/j.fzxb.20170907008

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In order to solve the problem of the damage to fibers due to over oxidation during oxidation degumming process of ramie, 1, 8-dihydroxyanthraquinone (anthraquinone) as degumming additive for protecting cellulose and hemicellulose was added in alkali hydroxyl peroxide degumming solution. The physical and chemical properties (tensile properties, degree of polymerization, hemicellulose contents and yield) of fiber can be adjusted by controlling the dosage of 1, 8-dihydroxyanthraquinone. Results show that the hemicellulose contents and yield increase with the increasing of 1, 8-dihydroxyanthraquinone dosage, and the tensile properties of fiber first show an upward trend and then a downward trend with the increasing of 1, 8-dihydroxyanthraquinone dosage. With the optimal dosage (2 %) of 1, 8-dihydroxyanthraquinone dosage, the content of hemicellulose, the yield of degumming process, polymerization degree and the work of rupture of the degummed fiber improved by 17.3%, 7%, 2% and 41%, respectively. In addition, the COD value of the degumming wastewater decreased by 40%, indicating the relatively eco-friendly oxidation degumming process.

Surface modification of Iron oxide yellow and its application in ultra-high molecular weight polyethylene

JOURNAL OF TEXTILE RESEARCH. 2018, 39(02):  86-90.  doi:10.13475/j.fzxb. 20170710505

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In order to improve the compatibility of iron oxide yellow ZnFe2O4 with ultra-high molecular weight polyethylene during the melt spinning process, iron oxide yellow ZnFe2O4 was modified with silane coupling agent KH570.  The influences of dosage of coupling agent, reactive time and reactive temperature were characterized by the oil-absorbed value, zeta potential, Fourier transform infrared spectrocopy (FT-IR), scanning electron microscopecom and contact angle, etc. The results show when the volume ratio of coupling agent to deionized water to anhydrous ethanol is 1：1：1.5, the optimal modification process is coupling agent accounting for 25% of pigments, and ultrasonic at 65℃ for 2.5 h. The modified pigment has the oil-absorbed value of 49.85%, zeta potential of 41.40 mV and contact angle of 154.5°. The surface property of Iron oxide yellow ZnFe2O4 varied from hydrophilic to lipophilicity. The SEM and torque of blend melt results show the compatibility of the modified ZnFe2O4 pigments in UHMWPE blend system are significant improved.

Antibacterial dyeing of wool fabric with nano prodigiosins produced by microorganism

JOURNAL OF TEXTILE RESEARCH. 2018, 39(02):  91-96.  doi:10.13475/j.fzxb.20170604006

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In order to promote the application of microbial dyestuff on the textile dyeing field, prodigiosins nano-dispersion was produced by adding nonionic surfactant to the culture media and fermenting in the presence of Serratia marcescens. Wool fabrics were dyed with the pigment nanosuspension. The influences of dyeing temperature, time and dye bath pH on dyeing effect were investigated. Moreover, the antibacterial property of the dyed wool was studied. The results indicated that the average particle size of nano prodigiosins is 285.8 nm and the size distributon is centralized since the despersity index is 0.193. The pigment concentration is 18.3 mg/L. The optimum dyeing temperature and time are  90 ℃ for 20 min, reapectively. In addition, the dyeing effect and antibacterial activity of dyed wool are influenced significantly by the pH value of dye liquor. When pH is 2.1, the dyed wool fabric possessed the highest antibacterial rate of 99.1% and 36.6% against Staphylococcus aureus and Escherichia coli, respectively. The antibacterial property of dyed wool against Staphylococcus aureus is distinctly superior to Escherichia coli.

Synthesis of integrated polyurethane acrylate and application thereof in photo-curable ink-jet printing

JOURNAL OF TEXTILE RESEARCH. 2018, 39(02):  97-105.  doi:10.13475/j.fzxb.20171000809

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A series of organosilicone and amino modified photosensitive polyurethane acrylates (PUA) were designed and synthesized for improve the safety, handeling and rubbing fastness of photo-curable ink-jet printing fabrics. According to the research of the rheological properties, photo initiated properties, tensile properties, optical properties and SEM analysis, the polyurethane acrylate has integrated function of low viscosity and modulus, high flexibility and co-initiation. While curing, the copolymer siloxane chain segments migrated to the film surface. The cured film has better flexibility and water resistance while the mechanical property loss is  small when the content of organosilicone is 5%. The photo-curable ink-jet printing ink was prepared successfully by mixing a photocurable polymerization system composed of the modified PUA and hydroxyethyl acrylate, 2-Hydroxyethyl acrylate, camphorquinone and other additives, and has the conversion rate os 96%, the transparency above 95%, the tensile stress of 1.5 MPa, the maximum elongation at break of 530%, and 100% elongation stress lower than 0.4MPa, low toxicity and good stability. The fabric subjected to the photo curing Ink-jet printing ink has good rubbing fastness up to grate 4.

Influence of fabric heating rates on salt-free pad-steam dyeing of reactive dye

JOURNAL OF TEXTILE RESEARCH. 2018, 39(02):  106-111.  doi:10.13475/j.fzxb.20170600306

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In order to enhancing the dye fixation rate of reactive dye in pad-steam dyeing process, the influence of the fabric heating rate on the dyeing properties of reactive dye was investigated to search the method of salt-free dyeing with high fixation rates. The temperature of fabric in the steaming process was calculated using the thermal conductivity and volumetric heat capacity measured. The influence of dye liquor composition and fabric pickup on the variation of fabric temperature was investigated. Besides, the colour performance and fastness of the dyed fabrics as well as the dye fixation rates were studied. The results indicate that the fabric heating rates are increased by adding the Na2SO4 into padding solutions, thereby enhancing K/S value and dye fixation rate. However, it does not meet requirements of the salt-free dyeing. Increasing the pickup resulted in increasing the thermal conductivity and volumetric heat capacity of fabrics, but decreasing the temperature of fabric. The K/S values of dyed fabrics and the dye fixation rates increased as the fabric pickups decreased, which is substantially in accordance with the variation of the fabric heating rates. The phenomenon confirmed that enhancing fabric heating rates is conducive to improving the dyeing properties of reactive dye. Reducing the fabric pickup can increase the fabric heating rates, which is an effective way to realize salt-free dyeing in pad-steam dyeing.

Adsorption and visible-light photodegradation of Cu-organic framework to dye wastewater

JOURNAL OF TEXTILE RESEARCH. 2018, 39(02):  112-118.  doi:10.13475/j.fzxb.20171009907

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In order to eliminate organic dyes from printing and dyeing wastewater, Cu(NO3)2 and 2,6-bis(4-carboxylphenyl)-4-(trifluoromethoxy) benzenamine were executed to synthesize a porous semiconductor type Cu-organic framework material Cu-MOF, which was employed to adsorb and photocatalytically degrade organic dyes in water. The experimental results demonstrate that the adsorption efficiency and adsorption rate constant for 10 mg towards cationic brilliant red 5GN (20 mL and 48.95 mg/L) are 98.88% and 9.73×10-3 mg/(g•min), respectively. And it could selectively adsorb dyes with different sizes. Under the irradiation of visible light, Cu-MOF (5 mg) could decompose reactive turquoise blue KN-G (40 mL and 35.81 mg/ L), with the visible light degradation efficiency and photocatalytic rate constant of 79.78% and 0.14 h-1, respectively, within 11 h. The optimal applied pH value of the Cu-MOF is determined to be 8. After five consecutive photocatalytic recycle tests, the photocatalytic degradation efficiency of Cu-MOF towards reactive turquoise blue KN-G is still up to 71.03%, indicating dual-functional characteristic of the material for physical adsorption and photocatalytic degradation of organic dyes in water.

Mechanical and thermal properties of phase change microcapsules with carbon nanotubes

JOURNAL OF TEXTILE RESEARCH. 2018, 39(02):  119-125.  doi:10.13475/j.fzxb.20170501607

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In order to solve problems of easy breakage and low heat transfer efficiency when phase change microcapsules (microPCMs) were prepared for heat-storage and thermo-regulated textile, MicroPCMs were prepared based on noctadecane core and melamine-urea-formaldehyde shell with O2 plasma modified multi-walled carbon nanotubes (CNTs) by in-situ polymerization. The influene of addition modified CNTs on mechanical and thermal properties of microPCMs were investigated. MicroPCMs were characterized by scanning electron microscopy (SEM), fourier transform infrared spectroscopy, atomic force microscope, differential scanning calorimetry and thermal constant analyzer. SEM images show that the microPCMs with CNTs are spherical and have relatively smooth surface. The results indicated that the mechanical and thermal properties of microPCMs can be remarkably improved by addition of moderate modified CNTs. Especially, when 2% of modified CNTs are added, the elasticity modulus and thermal conductivity of microPCMs are improved by 190% and 187%, respectively; and the heat enthalpy and encapsulated efficiency of microPCMs still can reach 224.4 J/g and 74.07%. Addition of modified CNTs into microPCMs is beneficial to enhance mechanical and thermal properties of microPCMs and facilitate temperature regulating performance of heat-storage and thermo-regulated textiles.

Preparation and properties of self-weaving composites of bacterial cellulose/polyester

JOURNAL OF TEXTILE RESEARCH. 2018, 39(02):  126-131.  doi:10.13475/j.fzxb.20171009006

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In order to study the preparation and properties of composites of bacterial cellulose (BC)/polyester nonwovens, BC/ polyester nonwovens composite were self-weven from polyester nonwovens as raw material by biological combination. Scanning electron microscopy, fourier transform infrared spectroscopy, thermal gravimetric analyzer, surface tension and universal testing machines were used to characterize the morphology, structure, thermal stability, hydrophobic and hydrophilic performance and tensile mechanical property. Results show that polyester fibers in nonwovens are adhered, wound and interspersed by BC, achieving good comb ination. The hydroxyl functional groups appear in the composites, and a slight red-shift occurred in the infrared spectrum. The thermal stability and hydrophilicity of the composites are improved. The tensile strength of BC/polyester nonwovens composites is improved and the fracture strength of the composites displays the trend of first increased and then decreasing with the increase of BC content.

Influence of different solvents on anticoagulant property of polyprrole/polyester marterials

JOURNAL OF TEXTILE RESEARCH. 2018, 39(02):  132-137.  doi:10.13475/j.fzxb.20171009306

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In irder to improve the cytocomtatibility of polyester (PET) materials, polypyrrole (PPY) with good biocompatibility was coated on PET fabric.  in situ polymerization using different solvents was used to prepared polypyrrole coating with different surface performances. The performance of dynamic blood clotting test was carried out to characterize anticoagulant properties of composited materials. The reaults show that defferent surface morphologies and K/S values can be acquired using different solvents and different ratiosfor the mixed solvents. The K/S value is smallest in the water as the solvent. For ACN/water solvent, with the increase of ACN/water ratio, the K/S value increases and the surface of PPy/PET is smoother when ACN/water ratio is smaller. BCI is the best when CTAB/Py is 1：2, improvwes about 140% at 5 min compared to the uncoated PET fabrics. Anticoagrlant peoperties are related to micromorphology and surface properties of PPy. 

Preparation and slow-release mechanism of Geranium wilfordii Maxim microcapsules-loaded compound fabrics

JOURNAL OF TEXTILE RESEARCH. 2018, 39(02):  138-143.  doi:10.13475/j.fzxb.20170403606

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In order to control the release speed of the drug in the compound fabric and prolong its release process, the Geranium wilfordii Maxim (GWM) extracts were encapsulated into polyvinyl alcohol (PVA) by interfacial polymerization. The GWM microcapsules were coated on cotton knits using water-borne polyurethane (PU)adhesive by direct coating. The morphology, particle size, thermal stabilityand slow-release properties of the microcapsules and the morphology and slow-release properties of the composite fabric were studied using SEM, TG and ultraviolet-visible (UV-VIS) spectrophotometer. The results indicates that the surface of GWM/PVA microcapsules is smooth, and the average particle size is 23.9 μm. The GWM/PVA microcapsules with a drug loading ratio of 33.0% show good thermal stability at 325°C. The release process following the non-fickian diffusion mechanism can last for more than 24 h in the buffer solution. The release process of the composite  fabric the similar diffusion mechanism. The release time is prolonged in the buffer solution.

Key technology of warp knitting manufacture execution system based on internet of things

JOURNAL OF TEXTILE RESEARCH. 2018, 39(02):  144-149.  doi:10.13475/j.fzxb.20170202807

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In order to solve the four prominent problems during the application of warp knitting manufacture execution system comprising complex data acquisition, lack of scientific data processing, single form of showing data, and system unsafety, a warp knitting manufacture execution system based on internet of things was put forward by summarized the characteristics of warp knitting production management.The architecture of the system, analyzed rapid acquisition of production data by wireless communication protocol technology and radio frequency identification technology was introduced, and the efficiency of data processing by establishing the data integrity constraint and link layer propocol was improved using front-end of web design to realize data visualization of warp knitting workshop and key technologies of safety design and specific content in warp knitting manufacture execution system in practical application. Trials results prove that the system can capture the data of warp knitting production quickly and accurately to achieve efficient processing of production data and provide visual diaplay, and provide an effective guarantee for improving the production efficiency and the product quality.

Simulation of electronic shogging system on warp knitting machine based on Simulink

JOURNAL OF TEXTILE RESEARCH. 2018, 39(02):  150-156.  doi:10.13475/j.fzxb.20171102907

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To solve the problem of warp knitting electronic shogging system optimization caused by the difference of electrical and mechanical characteristics, the variors parts of system were modeled on the basis of overall control principle, which covered servo drive and motor model, signal conditioning and feedback model, mechanical transmission mechanism, and the whole system simlation model was connected according to the input and output relations of transfer function. The model was verified and compared by MatLab/Simulink. The simulation oscillation gradually converges and quickly stabilizes through the system step response, which verifies the accuracy of the model and the stability of the system. In ouder to further study the dynamic and static characteristics of the system, the speed controller parameters were taken as an example, the system step response of different speed proportional gain was analyzed. The results show that increasing the speed proportional gain is beneficial to the system dynamic response of the electronicshogging system, while the gain increases to a certain value, the system will oscillate and even can't be used.

Global and local diversity features-fused colorimetry index testing and evaluation of colored spun yarns

JOURNAL OF TEXTILE RESEARCH. 2018, 39(02):  157-164.  doi:10.13475/j.fzxb.20171000508

Abstract ( 366 )   PDF (2185KB) ( 127 )   Save

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In order to establish a scientific and effective evaluation standard of colorimetry indexes for colored spun yarns, a large-area macro image acquisition system,  based on digital color measurement theory, was designed and implemented to solve the problem of conventional macro image acquisition on limited vision field, providing large area macro images for extracting and analyzing chromatic features. According to the specific coloring mechanism and process of colored spun yarns, a model combined global color features with local texture features for colorimetry index was established, consequently. Extracted third-order color moment features and color local directional pattern features can not only make full use of the complementarity between global and local features, but also combine diversities from different color spaces. Experimental results indicate that the extracted diversity features can accurately and steadily characterize the tiny changes of colorimetry indexes, and demonstrate ideal effectiveness and robustness of the fusion algorithm. Meanwhile, compared with conventional spectrophotometry, the designed novel systemis more adaptive and practical.

Woven fabric texture representation and application based on K-SVD dictionary

JOURNAL OF TEXTILE RESEARCH. 2018, 39(02):  165-170.  doi:10.13475/j.fzxb.20171001106

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In order to wel adapt the woven fabric texture and reduce the algorithm running time, three basic weave patterns (plain, twill and satin) were chosen as trained samples to learn an adaptive dictionary by K-means singular value decomposition (K-SVD) dictionary learning approach. In order to select appropriate sparsity cardinality T for different applications, peak sognal to noise ratio (PSNR) and structural similarity index measurement  (SSIM) wer chosen as evaluating preformance indexes. For regular fabric texture image reconstruction, T=6, the experimental results demonstrate that the proposed method not only can approximate fabric samples well, but also can improve the quality of reconsturcted image (in terms of PSNR and SSIM), in comparison with discrete cosine transformation dectionary. In addition, for fabric flaw detection, T=4, the K-SVD can well adapt samples with defects, and has stronger capability of identifying defects, compared with discrete cosine transformation dictionary.

Simulation of warp knitted plush fabric based on fractal noise and geometry shader

JOURNAL OF TEXTILE RESEARCH. 2018, 39(02):  171-176.  doi:10.13475/j.fzxb.20171008506

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In order to improve simulation of warp knitted plush fabrics, an approach based on fractal noise and geometry shader was proposed to solve the roblem of stiff or messy plush when defining the direction as consistent tangential or completely random. The randomness of plush using fractal noise was calculated, and then the  generated fractal noise was as a texture to feed the GPU for further adjustment. A set of chips along the tangential direction of plush were used to represent a plush. According to the relation between the tangential direction of the plush and the observation, two different chips were defined to ensure displaying continuous plush at any viewpoint. 3-D simulation of warp knitted plush fabric was realized by using a geometry shader of GPU. Comparison with real fabrics, the approach is proved superiorly naturalistic with real-time efficiency.