Table of Content

15 February 2019, Volume 40 Issue 02

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Fiber Materials

Preparation and waterproof and moisture-permeable properties of electrospun polyurethane/silica composite superfine fiber membrane

ZHANG Qiong, LIU Hanlin, LI Pingping, LI Ni

Journal of Textile Research. 2019, 40(02):  1-7.  doi:10.13475/j.fzxb.20180800307

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In order to prepare a superfine fiber membrane with waterproof and moisture-permeable properties, polyurethane/silica (PU/SiO₂) membranes were prepared by electrospinning. The spinning solution was prepared by adding hydrophobic SiO₂ to PU solution. The effects of spinning solution concentration and membranes thickness on the pore size of the membranes were analyzed by software simulation. The waterproof and moisture-permeable properties of the membranes were characterized by the water contact angle, hydrostatic pressure, air permeability and moisture permeability. The effects of different SiO₂ concentrations on the waterproof and moisture-permeable properties of the PU/SiO₂ composite superfine fiber membranes were studied. The results show that the pore size of membranes increase with the spinning solution concentrations, and decrease with the increase of the membranes thickness. When the concentration of SiO₂ is 9% and that of PU is 18%, the composite membranes are endowed with the water contact angle of 131°, the hydrostatic pressure of 6.4 kPa, the air permeability of 33.4 mm/s and the moisture permeability up to 8.065 kg/(m²·d). Meantime, the broken stress of the PU/SiO₂ composite membranes reaches 4.16 MPa, and the elongation at break reaches 184%. Therefore, the membranes have better dimensional stability than pure PU membranes.

Preparation of chemically cross-linked modified sodium alginate/krill protein composite fiber

YAO Qiang, GUO Jing, WU Jing

Journal of Textile Research. 2019, 40(02):  8-13.  doi:10.13475/j.fzxb.20180907006

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In order to enhance the comprehensive performance of sodium alginate/krill protein (SA/AKP) composite fiber, boric acid (H₃BO₃) was used as a crosslinking agent to crosslink and modify the fiber so as to prepare high-performance SA/AKP composite fiber. The interaction between optimal crosslinking temperature and molecules of the composite system was investigated. The thermal stability, mechanical properties and dynamic mechanical properties of the modified fiber were characterized. The results show that boric acid has an obvious effect on the intermolecular hydrogen bonds in the sodium alginate/krill protein composite system. Boric acid molecules and hydroxyl groups on the sodium alginate molecular chain are subjected to a dehydration condensation reaction to realize cross-linking, and the cross-linking temperature is 80 ℃, With the increase of boric acid content, the change in the thermal stability of the composite fiber is small, and the mechanical properties and storage modulus gradually increase. When the content of H₃BO₃ in the system is 1.5 g/L, the breaking strength of the fiber increases up to 2.58 cN/dtex, which is improved by 11.3% compared with the SA/AKP composite fiber before modification.

Recycling and cyclic utilization of waste polyester alcoholysis solution

LI Yanyan, LI Mengjuan, LU Jing, GE Mingqiao

Journal of Textile Research. 2019, 40(02):  14-19.  doi:10.13475/j.fzxb.20181002106

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In order to realize the recycling of polyester resources, waste polyester (PET) fabrics were degraded with ethylene glycol to produce bis(2-hydroxyethyl) terephthalate (BHET). In order to maximize the utilization ratio of ethylene glycol (EG) in the degradation process, the alcoholysis solution was recovered by vacuum distillation before and after BHET recrystallization, and reused in the degradation of waste polymers instead of fresh EG. The alcoholysis solution and alcoholysis products were determined by infrared spectroscopy, differential scanning calorimetry and thermogravimetric analysis. The results show that alcoholysis solution recovered before BHET recrystallization can be recycled for 4-5 times. The EG recovery rate is 57.1%-89.2%, the BHET yield is 58.9%-70.3%. The recycling upper limit of the alcoholysis solution depends on the self-polymerization degree of EG. The alcoholysis solution recovered after BHET recrystallization can be recycled for 1-2 times. After reaching the use upper limit of the alcoholysis solution, the EG recovery ratio is reduced from 91.3% to 23.7%, and the BHET yield is reduced from 71.2% to 50.2%.

Application of UV-Vis spectrophotometry in quantitative monitoring sustained release of 2,3,5-triiodobenzoic acid

LIU Laijun, XU Haiyan, ZHAO Fan, WANG Fujun, WANG Lu

Journal of Textile Research. 2019, 40(02):  20-25.  doi:10.13475/j.fzxb.20181006406

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In order to study the sustained release rules of 2,3,5-triiodobenzoic acid (TIBA) in degradation solution of radiopaque poly-p-dioxanone (PPDO) filaments, the UV spectrums and regression curves of TIBA in different volume ratio blend degradation solutions of phosphate buffered saline (PBS) and ethanol (V_PBS:V_ethanol were 1:3,1:1 and 3:1) were explored by UV-Vis Spectrophotometry. According to regression curve, the release amount of TIBA in the degradation period was measured and calculated and then fitted with a drug release models and the corresponding release rules were analyzed. The results show that ideal spectrums and regression curves could be obtained in three kinds of blend solution. Considering the amount of ethanol used, the volume ratio of 3:1 was selected as the standard solution and it can still maintain stability after placing in an environment of 37 ℃ for 8 d. The results of model fit show that the release rule of TIBA is in consistence with the first-order release model.

Textile Engineering

Formation and characterization of auxetic yarns with interlaced-helical structure and fabrics

LIU Sai, ZHENG Dongming, PAN Xingxing, LIU Gui, DU Zhaoqun

Journal of Textile Research. 2019, 40(02):  26-29.  doi:10.13475/j.fzxb.20181100504

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In order to improve the structural stability and applicability of auxetic yarn with a helical wrapping structure, a novel interlaced-helical structure and a forming method were designed. The auxetic effects of two kinds of yarns with the same materials and structure parameters were studied. By means of of USB microscope and tensile tester, the diameter of yarn under axial tensile strain were measured, and then, Poisson's ratio were calculated. The experimental results show that both the structure stability and the auxetic effect of the novel auxetic yarn are improved obviously. The maximum negative Poisson's ratio is -1.6 with the axial strain of 22.5%. In addition, the preliminary investigation results of the woven fabric based on the yarn show that the deformation of the auxetic yarn causes the variety of the fabric porosity. When the latitudinal strain is 20%, the porosity of the fabric is 4%. It also provides the possibility for the application of intelligent filter materials and fashion designing.

Coloration rules between colored spun yarns and its fabrics based on spectral pan-similarity measure

YUAN Li, WANG Danshu, GU Qian, TU Shaojie, XIONG Ying, YUAN Haoran, LIU Junping, YAN Yuchen

Journal of Textile Research. 2019, 40(02):  30-37.  doi:10.13475/j.fzxb.20180905208

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Aiming at the diversity and complexity of colored spun fabric, a spectral similarity measure model based on the discrete Fréchet distance and the Pearson correlation coefficient was established. Meanwhile, the discriminant criterion of spectral reflectance curve characteristics in view of intra class distance and inter class distance were established, and applied in analysis on the color transfer and influence factors between colored yarn and its fabric. The results show that compared with the conventional color difference analysis model, the spectral similarity measure model and the difference criterion are stable and effective in color characterization and discriminant capability. The difference of mixing ratio, property, type and twisting coefficients of dyed fiber cause significant difference in color of colored spun yarns and fabrics. When the difference of the mixing ratio of dyed fibers is lower than 2% and the difference of yarn twist coefficient is lower than 10, the color change happens between yarn and fabric, but the influence of the weaving process is limited and is a weak interference factor relative to the difference of fiber property and types.

Fabric defect detection based on improved local adaptive contrast method

DU Shuai, LI Yueyang, WANG Mengtao, LUO Haichi, JIANG Gaoming

Journal of Textile Research. 2019, 40(02):  38-44.  doi:10.13475/j.fzxb.20180607007

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In order to improve the fabric defect detection accuracy and detection effect, a background estimation method based on the most similar neighborhood patch was used to improve the detection rate. Firstly, the image was preprocessed by homomorphic filtering. Then, each pixel of the filtered image was taken as center point and window size of 11 pixel×39 pixel was taken as the central region. By calculation the similarity between the central region and the surrounding neighborhood to find out the neighborhood which was most similar to central region. So then, the purpose of background estimation was achieved. The background-difference principle was used to obtain the target image and the method of threshold segmentation and morphological was used in the image. Finally, the defection results were obtained. The experiment results show that the method is superior to the traditional detection method, not only can detection the defect image in complex background, but also has good detection results for fabric defect images under influence of external factors and different fabric weaves, the detection rate can reach 98%, and with high recognition rate, applicability and a certain degree of anti-interference.

Micro-structure and properties of multilayer multiaxial woven composites

WANG Xinmiao, CHEN Li, ZHANG Diantang, CHEN Dong

Journal of Textile Research. 2019, 40(02):  45-52.  doi:10.13475/j.fzxb.20180800408

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In order to study the tensile property and failure mechanism of multilayer multiaxial woven composites, based on the multilayer multiaxial weaving process and the spatial movement rule of yarn in the structure, the relationship between process parameters and structure parameters were deduced. Two kinds of multilayer multiaxial woven composites of different structures were prepared from carbon fibers and epoxy resin as raw materials by the multilayer multiaxial weaving process and the resin transfer molding composite process. The quasi-static tensile property of the material were measured by universal testing machine and a non-contact all-field stain meter, and was compared with that of three-dimensional orthogonal composite. The results show that the content of bias yarn in the structure has certain influence of the warpwise tensile property of the multilayer multiaxial woven composites. Bias yarn blocks cracks and strain from extending along the warpwise direction to a certain extent, and influences the failure modes of the material to a great extent. All the warps in the warp layer at the fracture of the sample are broken, and some of yarn in the bias yarn layer are not broken, and the tensioned samples are not completely broken.

Core structure and condensing mechanism of compact spun yarn

FU Ting, ZHANG Yuze, WANG Jiang, CHEN Nanliang

Journal of Textile Research. 2019, 40(02):  53-57.  doi:10.13475/j.fzxb.20181100405

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In order to explain the additional twist phenomenon of the compacted spinning and the contradiction with the classical non-open end twisting theory, the core structure of the open-end fibers and non-open-end fibers of the main body was proposed. The three-dimensional digital microscope was used to observe the structural differences between the compact spun yarn and the ring spun yarn after the untwisting, which indicated that the core structure of the fibers in the condensing area is reasonable. The fibers samples in the condensing area were observed using the microscope, and a phenomenon in which the non-open-end fibers were wrapped by the open- end fibers was found. Hereby, the semi-open end twisting model of the fibers in condensing zone was established, that is, the negative pressure acts on the non-open end fiber of the main body via the lattice apron, the negative pressure and the collecting groove in combination to apply the open end fibers twisting effect on the main fibers. The formation of the core structure of condensing fibers results in the additional twist, which provides a theoretical basis for the condensing mechanism..

Thermal adhesion enhancement process of air jet vortex spun yarn

LIN Yanyan, ZOU Zhuanyong, CHEN Yuxiang, YANG Yanqiu

Journal of Textile Research. 2019, 40(02):  58-62.  doi:10.13475/j.fzxb.20180908405

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Aiming at poor strength of air jet vortex spun yarn, low-melting point polyester fiber was introduced to reinforce air jet vortex spun yarn by heat bonding. The significant differences of the influence of different thermal contact modes on the yarn fracture work were compared by means of T-test. Orthogonal design was used to study the influence of heat treatment temperature, heat treatment speed and draw ratio on the yarn fracture work, and the optimal process was verified. The results show that the original yarn subjected to non-contact heat treatment has significantly improved fracture work. The fracture work of yarns increases first and then decreases with the rise of heat treatment temperature. When the speed increases, it shows an upward trend. With the increase of the draw ratio, the fracture work improves obviously. The optimal heat treatment process is: heat treatment temperature of 145 ℃, heat treatment speed of 600 cm/min, and draw ratio of 1.06, and the fracture work of the jet vortex spun yarn can be increased by 13% after the optimal process heat treatment.

Comparative analysis of rotor spinning machines and yarn performance between conventional and dual-feed rotor spinning

SHI Qianqian, AKANKWASA Nicholus Tayari, LIN Huiting, ZHANG Yuze, WANG Jun

Journal of Textile Research. 2019, 40(02):  63-68.  doi:10.13475/j.fzxb.20181100206

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In view of conventional rotor spinning's limitation which can only spin the fiber raw materials with similar properties of pure spinning or blending because of single carding technique, it is difficult to produce the blending yarn with large difference in fiber properties. Based on the recent research of dual-feed and dual-comb rotor spinning technology, this paper briefly introduced the yarn forming mechanism of conventional rotor spinning and the characteristics of dual-feed rotor spinning technology, and did the comparative analysis of rotor spinning machines' structure in the two rotor spinning systems. By means of fluid dynamics numerical simulation and sample yarn spinning test, this paper further analyzed conventional rotor spinning and dual-feed rotor spinning comparatively from the two aspects of the airflow distribution inside the rotor, which includes the vortex, airflow velocity and pressure, and the yarn performance. The research result verifies the feasibility and superiority of the dual-feed rotor spinning.

Knitting process and properties analysis of underarm stitching of fully-fashioned garment

LU Lisha, JIANG Gaoming, LUO Xuan

Journal of Textile Research. 2019, 40(02):  69-75.  doi:10.13475/j.fzxb.20180502307

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In order to further understand the integral forming principle of fully-fashioned garment and develop products meeting the needs of different people, the knitting process of sleeve transfer before underarm stitching was studied from three aspects: single transfer, multiple transfer and non-transfer, and the ways of underarm stitching were studied in four ways: no multi-knitting, multi-knitting on sleeve, multi-knitting on sleeve & body and tri-knitting on sleeve & body. Taking the V-neck shoulder sleeve as an example, the fully-fashioned garments formed with four types of underarm stitching were knitted with 2 plied wool yarns, respectively, and their properties of underarm areas were tested. The results show that no multi-knitting takes the least time, and is more suitable for efficiency-oriented production. Multi-knitting on sleeve & body shows the best visual effect, and is more suitable for appearance-oriented production; tri-knitting on sleeve & body possesses the best tensile property, and is more suitable for strength-oriented production; and the breathability of no multi-knitting ranks first, and is more suitable for comfort-oriented production.

Size prediction and size modeling of warp knitted seamless sport suits

LIU Haisang, DONG Zhijia, ZHANG Qi, XIA Fenglin, CONG Honglian

Journal of Textile Research. 2019, 40(02):  76-81.  doi:10.13475/j.fzxb.20180602606

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Aiming at the repeated sample weaving, resizing, low efficiency and long period during the new product development, based on the measurement and calculation of the theoretical dimensions and final dimensions of different stitches, the shrinkage ratio of different stitches in different drawing densities were calculated. With eight different drawing densities, four kind of common organizations were knitted on the two-needle bar warp knitting machine. The relationship between the drawing density and the size shrinkage was studied. The results show that a significant linear relationship exists between the drawing density and the size shrinkage. On this basis, the size prediction model of the organization was established. Based on the specifications of knitted garments, the function of automatic generation of the garment template in WKCAD was realized by programming, which provides an effective way to realize the new product design and development accurately and quickly.

Preparation and tensile fracture properties of basalt fabric reinforced polylactic acid composites

YU Juanjuan, LIU Shuqiang, WU Gaihong, YIN Xiaolong

Journal of Textile Research. 2019, 40(02):  82-86.  doi:10.13475/j.fzxb.20180405905

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In order to improve the mechanical properties of polylactic acid(PLA)composites, basalt fabric(BF)reinforced polylactic acid composites were prepared by vacuum infusion method. The effects of mass fraction of coupling agent KH550, laying angle and the layer number on the properties of the composite were studied, and the fracture morphology of the composite after tensile test was observed by scanning electron microscope. The results show that the tensile fracture strength of the composite increased first and then decreased with the increase of KH550 mass fraction. The best treatment effect of KH550 was 3%, the tensile strength of composite was increased to 82 MPa, and the section of the composite was neat after tensile test. The tensile fracture performance of the composite was better when the laying angle were 0° and 90°, and the worst was 45°, and the phenomenon of interlaminar separation was obvious. Meanwhile, with increase of the layer number of basalt fabric in a certain range, the tensile fracture strength of the composite risse.

Preparation and properties of poly(fluorinated ethylene-propylene) fiber fabric

PAN Jinfeng, XIAO Changfa, YAN Jingjing, FENG Yan, ZHU Zhengtao

Journal of Textile Research. 2019, 40(02):  87-93.  doi:10.13475/j.fzxb.20180801007

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In order to weave textiles with the durability in special environments, poly(fluorinated ethylene-propylene)(FEP) yarns were prepared from FEP fiber by twisting and doubling. The plain weave fabric of FEP with the width of 250 mm and the thickness of 0.51 mm was woven by a semi-automatic loom. Electronic tensile testing machine, dynamic contact angle tester, fabric air permeability tester, fabric moisture permeability tester, abrasion tester, ultraviolet condensation aging test box, differential scanning calorimeter, X-ray diffractometry and Fourier transform infrared spectroscopy were applied to analyze and characterize the properties of yarns and fabrics. The results show that FEP yarns have good mechanical properties and hydrophobicity. FEP fabric have excellent mechanical properties, high-temperature resistance and excellent chemical resistance and aging resistance. The thermal performance, crystalline structure, chemical structure and mechanical properties of the fabrics treated with acid, alkali and organic solvents have no significant change. The mechanical properties of the FEP fabrics treated under UV irradiation have no significant change, showing the feasible application of FEP fiber fabric in special environments.

Characteristics of capacitive pressure sensor based on warp-knitted spacer fabric

SUN Wan, MIAO Xuhong, WANG Xiaolei, JIANG Gaoming

Journal of Textile Research. 2019, 40(02):  94-99.  doi:10.13475/j.fzxb.20180601506

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In order to achieve the intelligent cushion monitoring human sitting posture to assist human health, six types of warp-knitted spacer fabrics were used as the dielectric layer to prepare pressure-capacitance sensors. The static performance of warp-knitted spacer fabric pressure-capacitance sensors was studied. Compression and electrical experiments were performed on six kinds of sensors to obtain a stress-capacitance curve. Combining the compression performance of the warp-knitted spacer fabric, the stress-capacitance curve of the sensor was divided into three stages, and the sensitivity and linearity of each stage were studied. The results show that as the pressure increases, the linearity of the capacitive pressure sensor gradually deteriorates. The sensitivity of the capacitive pressure sensor gradually increases and then gradually decreases. In the compressed platform area of the spacer fabric, the capacitive sensor has the greatest sensitivity, and in the elastic area where the spacer fabric is compressed, the capacitive sensor has the best linearity.

Preparation and electromagnetic shielding property of conductive poly(p-phenylene terephamide) of reinforced composite materials

MIAO Runwu, JIN Lihua, WEI Qiyu, HAN Xiao, HONG Jianhan

Journal of Textile Research. 2019, 40(02):  100-104.  doi:10.13475/j.fzxb.20181002405

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In order to improve the conductivity of poly (p-phenylene terepahmide) (PPTA) filament yarn, conductive PPTA/polyaniline (PANI) composite yarn was manufactured by an in-situ polymerization-based continuous yarn conductive treatment process. Conductive PPTA yarn reinforced bi-axial, tri-axial and tetra-axial composite materials were prepared by using the conductive PPTA/PANI composite yarn as reinforcement and unsaturated polyester resin as matrix, and then the electromagnetic shielding effectiveness of the composite materials were measured. The results indicate that the surface of PPTA fiber is covered with conductive PANI layer after conductive treatment, the electrical conductivity can reach 1.4-1.9 S/cm, and the mechanical properties of the PPTA filament yarn declines slightly after treatment. The shielding effectiveness value of the multi-axial conductive PPTA yarn reinforced composite materials increases with the axial direction and density of conductive PPTA yarn, when the fabric density is 70/(5 cm), the average shielding effectiveness value of the tetra-axial conductive PPTA yarn reinforced composite material reaches 22 dB in the frequency range from 0.1 GHz to 1.5 GHz.

Using fuzzy comprehensive evaluation method to classify fabrics for coolness level

CHU Xinxin, XIAO Hong, FAN Jie

Journal of Textile Research. 2019, 40(02):  105-113.  doi:10.13475/j.fzxb.20181101509

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The self-developed heat flow coolness tester was adopted to test the transient heat flux density maximum and the quilibrium heat flux density of fifty-seven fabrics. Using the above test values, the contact feeling of the fabric was evaluated from both subjective and objective aspects. For objective evaluation, the cooling evaluation index of fabrics was divided into five categories based on They were marked as A,B,C,D and E, the coolness was weakened in turn. The fuzzy comprehensive evaluation method was used to classify the transient and steady heat flux values obtained by the test, and obtained the range of transient and steady heat flux values corresponding to different coolness levels. For subjective evaluation, the tester directly touched the fabric to evaluate and analyzed the cool feeling of the fabric subjectively, and obtained the coolness level of the fabric. Subjective and objective evaluation of fabrics has a strong consistency in the contact cooling results, the cooling grade of textile fabrics is accurately divided, which can promote the specification of the cool textile market.

Dyeing and Finishing & Chemicals

Polysaccharide microcapsules via layer-by-layer assembly for cotton fabric as sustained release vessel

LIU Fei, LI Qiujin, GONG Jixian, LI Zheng, LIU Xiuming, ZHANG Jianfei

Journal of Textile Research. 2019, 40(02):  114-118.  doi:10.13475/j.fzxb.20180708905

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The oppositely charged sodium alginate (Alg), chitosan (Chi), hyaluronic acid (HA) were coated onto the CaCO₃ template via layer-by-layer (LBL) self-assembled technique. The template was removed by using ethylenediaminetetraacetic acid (EDTA) to obtain hollow Alg/Chi/HA microcapsules. The purpose is to prepare biosafety functional fabrics.The morphology and thermal stability of microcapsules were studied by optical microscope with a large-depth-of-field, scanning electron microscope, infrared spectroscopy and comprehensive thermal analyzer. The results show that Alg/Chi/HA microcapsules have good hollow structure and strong stability. The pH-stimuli release behavior of microcapsules were investigated. These Alg/Chi/HA microcapsules were finished in the cotton fiber to manufacture the sustained releasing textile. This work is beneficial for the development of functional fabrics.

Effect of ultrasonic assistance on morphology of silk fibroin microspheres prepared by emulsion cross-linking process

WANG Zongqian, WANG Dengfeng, ZHOU Hang, LI Jun

Journal of Textile Research. 2019, 40(02):  119-124.  doi:10.13475/j.fzxb.20181005906

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In order to solve the easy aggregation and nonuniform particle size distribution of silk fibroin blank microspheres prepared by emulsion cross-linking process, ultrasonic assistance was employed in the emulsion cross-linking process. The particle size distribution and the morphology of microspheres were measured by laser particle size analyzer and scanning electron microscopy. The results show that in the absence of the ultrasonic assistance, the microspheres prepared by emulsion cross-linking process have the average particle size of 15.08 μm with the standard deviation (SD) value of 0.515, and the aggregation is very obvious. However, in the presence of ultrasonic assistance, the average particle size decreases with the increase of ultrasonic frequency and ultrasonic power. The particle size of the microspheres prepared in the presence of the ultrasonic assistance at 45 kHz and 100 W reduces to 26% of the original one. The SD value of microspheres also decreases, indicating that ultrasonic assistance can significantly reduce the aggregation of the microspheres and promote the uniform distribution of the particle size of the microspheres.

Rapid pad-steam peroxide bleaching process of cotton woven fabric using a cationic bleach activator

TANG Wenjun, PENG Minghua, XIANG Zhonglin, SHAO Dongyan, NI Jiadong, XU Changhai

Journal of Textile Research. 2019, 40(02):  125-129.  doi:10.13475/j.fzxb.20181101205

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In order to improve the production efficiency and reduce energy consumption in bleaching of cotton woven fabric, a rapid pad-steam peroxide bleaching process was conducted by using a cationic bleach activator of (N-(4-(triethylammoniomethyl)benzoyl)caprolactam chloride (TBCC). Investigations were carried out to analyze the influences of alkalis, concentration of TBCC, steaming time and concentration of peroxide stabilizer by measuring the degree of whiteness and degree of polymerization of the bleached fabrics. It is found that the rapid pad-steam peroxide bleaching process could be optimized by using sodium citrate as pH regulator with a molar ratio of TBCC, hydrogen peroxide and sodium citrate in 1:1.2:1.4. The rapid pad-steam peroxide bleaching process is capable of shortening the steaming time to 4 mins or less, and raising the CIE whiteness index from 36.30% to 80.65%, but cause no apparent fiber damage.

Functional finishing of dopamine modified silk fabric with ferric chloride

GUAN Jinping, KUANG Xiaohui, TANG Rencheng, CHEN Guoqiang

Journal of Textile Research. 2019, 40(02):  130-134.  doi:10.13475/j.fzxb.20181100905

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In order to endow silk fabric with multifunction, the bio-based dopamine was used to modify silk fabric, and functional groups such as amino group and phenolic hydroxyl group were introduced on the surface of the fabric, and then, the modified fabric was immersion treated with ferric chloride. The properties of the finished fabric were characterized by spectrophotometer, scanning electron microscope, oxygen index meter and micro-combustion calorimeter. The laundering durability to washing of the finished silk fabric was discussed. The results show that the polydopamine-modified silk fabric could improve its char formation and successfully chelate the iron ions. After being treated with ferric chloride, the oxygen index of dopamine modified silk fabric increass to 29.1%, and its heat release capacity and the total heat release are reduced to 40 J/(g·K) and 2.3 kJ/g, respectively. The finished fabric has certain UV shielding properties, and the oxygen index of the fabric after washing is still 28.2%.

Electric conductivity of cotton fabrics by graphene UV curable coating

CAO Jiliang, XU Licong, MENG Chunli, LI Xiaochun

Journal of Textile Research. 2019, 40(02):  135-140.  doi:10.13475/j.fzxb.20180701106

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Reduced graphene oxide (RGO) was used to print on the surface of cotton fabrics to obtain flexible conductive textile materials by UV-curing technology. The mass concentration of RGO, polyurethane acrylate (PUA), photoinitiator 1173 and trimethylolpropane triacrylate (TMPTA) and the curing time on conductive properties of cotton fabric was explored. The conductivity of cotton fabrics were tested, and the morphology of RGO printed on the surface of cotton fabrics was characterized by scanning electron microscopy. The results show that the conductivity of cotton fabrics increases with the increasing of RGO mass concentration. The electrical durability, however, decreases with the increasing of RGO mass concentration. The conductivity of cotton fabrics decreases with the increasing of PUA, photoinitiator 1173 and TMPTA mass concentration, and the electrical durability increases at the same time. The SEM test results show that with the increasing of RGO mass concentration, the amount of RGO coated on the surface of cotton fabrics is increased, and the continuity of RGO conductive layer is enhanced. It is concluded that the optimal UV curable pringting process is the mass ratio of RGO, PUA, TMPTA and photoinitiator 1173 10:4:69:17, curing for 15 s, the printed cotton fabrics obtain excellent electrical conductivity and electrical durability.

Preferential and recyclable adsorption of dyes from water by Zr-organic skeleton

LI Qing, FAN Zenglu, ZHANG Luohong, LI Yong, CHEN Chuangxun

Journal of Textile Research. 2019, 40(02):  141-146.  doi:10.13475/j.fzxb.20181100306

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In view of the water pollution caused by printing and dyeing wastewater, a three dimensional porous Zr-organic skeleton material with high water stability was successfully assembled from ZrCl₄ with 2,2'-Biquinoline-4,4'-dicarboxylicacid (H₂L) under 100 ℃ with solvothermal synthesis method. It was deployed to realize the selective and recyclable adsorption of dyes with different sizes from water. The results demonstrate that the selective adsorption towards Methylene Blue (MB), Cationic Brilliant Red 5GN (BR14) and Cationic Bright Yellow 7GL (BY24) is achieved in 6 groups of mixed aqueous solution composed of reactive dyes and cationic dyes. The removal efficiency towards cationic dyes are all above 79%, in which the removal efficiency for MB is as high as 99.78%. After 8 rounds of adsorption-desorption cycle experiment, the adsorption efficiency of 40 mL 15.7 mg/L MB is still up to 97.0%. In addition, X-ray powder diffraction measurements shows that the crystallinity of Zr-MOF is almost unchanged after 8 adsorption-desorption cycles and 48 h in strong acid (hydrochloric acid) and strong alkali (NaOH) aqueous solution with pH value of 2-14, demonstrating very reliable stability and recycling ability.

Apparel Engineering

Predictions of physiological reaction and skin burn of firefighter exposing to thermal radiation

SU Yun, YANG Jie, LI Rui, SONG Guowen, LI Jun, ZHANG Xianghui

Journal of Textile Research. 2019, 40(02):  147-152.  doi:10.13475/j.fzxb.20181101306

Abstract ( 759 )   HTML ( 2 )   PDF (5326KB) ( 266 )   Save

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In order to improve the evaluation criteria on thermal protective performance of firefighting protective clothing, the prediction model on physiological reaction and skin burn of firefighter exposing to thermal radiation was developed based on mechanisms of heat transfer in clothing and human thermal physiological regulation. The changing trend and prediction deviation of mean skin temperature and core temperature were analyzed by the thermal protective performance tester of clothing. The results demonstrat that the mean skin temperature and core temperature predicted by the model are slightly larger than the values measured by the experiment, but the overall trend presents higher consistence with the experimental results. Additionally, firefighters in the heat exposure subject to threats of both skin burn and heat stress. The skin burn is caused during the exposure while it is more likely to produce heat stress after the end of exposure, which is attributed to lag effect of heat transfer. Therefore, the skin burn and the heat stress should be both used to more precisely characterize and improve the thermal protective performance of firefighting protective clothing.

Machinery & Accessories

Effect of bypass channel on rotor-spun yarn properties in rotor spinning

LIN Huiting, AKANKWASA Nicholus Tayari, ZHANG Yuze, SHI Qianqian, WANG Jun

Journal of Textile Research. 2019, 40(02):  153-158.  doi:10.13475/j.fzxb.20181007006

Abstract ( 1052 )   HTML ( 3 )   PDF (4828KB) ( 108 )   Save

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In order to reduce or eliminate the vortices generated at the transport channel inlet so as to decrease its adverse effect on fiber configuration, a bypass channel located on the extension of the long side of the transport channel was introduced as an air supply channel. The numerical simulation method was adopted to study the airflow dynamics of the modified transport channel. Combining with the spinning tests and fiber configuration tests, the effectiveness of the bypass channel in improving the airflow field and rotor spun-yarn properties was evaluated. The results show that by adopting the bypass channel, the vortices generated at the transport channel can be eliminated, and the air velocity in fiber separation area is increased, thus increasing the fiber peeling-drawing ratio. The rotor spinning machine with the bypass channel has a positive effect on improving the yarn tenacities as well as decreasing the number of hook fibers in the rotor groove. This indicates that eliminating the vortices and increasing the fiber peeling-drawing ratio are beneficial to fiber morphology, thus improving the yarn fracture strength.

Management & Information

Method of temperature close-loop precision control based on cyber-physical systems for intelligent workshop of ring spinning

YIN Shiyong, BAO Jinsong, SUN Xuemin, WANG Jiacheng

Journal of Textile Research. 2019, 40(02):  159-165.  doi:10.13475/j.fzxb.20181004707

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The temperature of the intelligent workshop of ring spinning has a great influence on the spinning process and the quality of spinning, and it is necessary to precisely control its fluctuation. The temperature control method of the intelligent workshop of ring spinning based on cyber-physical systems was proposed by analyzing the big data of the ring spinning, forming an adjustment strategy for air conditioning air volume, heating capacity, etc. and the temperature closed-loop precise control was realized. Firstly, the temperature closed-loop precise control architecture was proposed, which is divided into four layers: physical layer, communication layer, information layer and control layer. Secondly, the temperature closed-loop precision control model was established, and the temperature precise control strategy was formed through data analysis. Finally, the airflow field and temperature field of the intelligent workshop were simulated through a case study, and the measured average temperature value was compared with the simulated temperature value. The results show that the deviation between the measured average and the simulated value does not exceed ±0.62 ℃, and the proposed method can accurately control the intelligent workshop temperature to fluctuate within 2 ℃.

Polyester drawn textured yarn production process optimization based on carbon emission accounting

SHAO Jingfeng, MA Chuangtao, WANG Ruichao, YUAN Yulou, WANG Xiyao, NIU Yifan

Journal of Textile Research. 2019, 40(02):  166-172.  doi:10.13475/j.fzxb.20181006107

Abstract ( 747 )   HTML ( 7 )   PDF (6301KB) ( 174 )   Save

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In order to solve the problem of no reasonable optimization of the production process due to the overlooking dynamic energy consumption in the differential fiber production process, the production process and energy consumption of the differential fiber production process were firstly analyzed, and the energy consumption metering and accounting model based on carbon footprint was built. Then, the carbon emission function based on green low carbon was designed based on the energy carbon consumption, material carbon consumption and process carbon consumption. Furthermore, the polyester low elastic production was selected as the research object, and a process optimization model of the polyester low elastic filament based on carbon emission accounting was designed. Finally, on the basis of historical data, the process optimization model was solved. The results show that the model optimizes the key process parameters of the differential fiber production process, and the carbon emission of the polyester low elastic filament production decreases by 13.35%.

Comprehensive Review

Research progress of flexible lithium battery electrodes based on carbon fibers and their fabrics

CHEN Yue, ZHAO Yonghuan, CHU Zhudan, ZHUANG Zhishan, QIU Linlin, DU Pingfan

Journal of Textile Research. 2019, 40(02):  173-180.  doi:10.13475/j.fzxb.20180801808

Abstract ( 903 )   HTML ( 11 )   PDF (7331KB) ( 287 )   Save

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With the rapid development of wearable technology, the demand for flexible lithium batteries is increasing. The combination of active electrode materials with excellent electrochemical properties and flexible nano-carbon-based materials is a hot research direction for the preparation of high-performance flexible lithium battery electrodes. In this paper, the research and application of carbon fiber and fabric in flexible electrode materials of lithium ion and lithium sulfur battery were reviewed. The different methods and progress of preparing flexible composite electrode materials are summarized, including electrospinning technology, hydrothermal method, heat treatment, coating, magnetron sputtering, atomic layer deposition and thermal etching. All of the obtained electrode materials show excellent performance in some aspects, such as high reversible capacity, excellent cycle performance, and enhanced mechanical strength, etc. Finally, the prospect of the development of flexible lithium battery electrodes based on carbon fiber and fabric was put forward.