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Table of Content

    15 November 2017, Volume 38 Issue 11
    • Light-stability and enhancement mechanism of polyphenylene sulfide fiber modified by graphene
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  1-8.  doi:10.13475/j.fzxb.20170404008
      Abstract ( 503 )   PDF (2314KB) ( 254 )   Save
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      In order to improve the light-stability of polyphenylene sulfide (PPS) fibers, PPS-graphene (PPS-G) nanocomposite fibers were prepared via pre-kneading/ melt-mixing and melt spinning to improve the photo-stability of PPS fibers. The mechanical property retention rate and the melting behavior of PPS-G fibers before and after xenon lamp aging treatment were characterized by monofilament strength tester and differential scanning calorimeter so as to further investigate the enhancement mechanism of graphene contents on light stability of PPS-G fibers. The results showed that the mechanical property retention rate of PPS-G composite fibers after 192h of aging treatment increased significantly with the increase of graphene contents. When the content of graphene was 1.0 wt%, the breaking strength and the elongation retention rate of treated PPS-G composite fibers were 80.2 % and 90.6 % respectively, which increased by 23.8 % and 26.1 % in comparison with that of neat PPS fibers. In addition, Tm of pure PPS fibers after treatment decreased by 7.1 ℃ while Tm of PPS-G-1.0 composite fibers after photo-aging decreased only by 3.0 ℃ , indicating that influences of photo-aging on melting point of PPS-G composite fibers reduced obviously. The results show graphene are adapted to speculate the light-stability enhancement mechanism of polyphenylene sulfide fiber.

      Classified extraction and properties of bamboo fiber
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  9-15.  doi:10.13475/j.fzxb.20170201707
      Abstract ( 646 )   PDF (2235KB) ( 279 )   Save
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      In order to investigate the property differences of the bamboo fibers extracted from different years and zones, the chemical composition, surface morphology, density, moisture absorption and tensile strength of bamboo fiber were tested. And the bamboo fibers were extracted from sinocalamus affinis with different years and zones by physicochemical method. The results show that with the increase of year, the moisture regains decreases first and then increase with the year increase. The fiber density increase first and then decrease with the increase of the year.The fiber density increases with the increase of height. The moisture regains decrease first and then increase with the increase of height. The density of fiber extracted from three-year and the tip is biggest (1.70g/cm3).And the density of fiber extracted from four-year and the bottom is smallest(1.51g/cm3). The moisture regain of fiber extracted from three-year and the middle is smallest (12.94%). The tensile strength of fiber extracted from three-year bamboo is more stable, and the tensile strength of fiber extracted from four-year and middle bamboo is the highest (787.42MPa).

      Preparation of ultrafine polyacrylonitrile nanofibers via composite electrospinning
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  16-21.  doi:10.13457/j.fzxb.20170500907
      Abstract ( 866 )   PDF (2487KB) ( 148 )   Save
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      In order to obtain polyacrylonitrile(PAN) nanofibers with smaller diameter than those obtained by conventional electrospinning method, the polyacrylonitrile/cellulose acetate butyrate(PAN/CAB) composite nanofibers were prepared by composite electrospinning followed by removing CAB to obtain the final ultrafine PAN nanofibers, and the modified by amine comounds for adsorption of Direct Red 23 (DR23). The influences of the blend ratio of PAN and CAB(PAN/CAB), the concentration of spinning solution and the spinning jet velocity on the diameters of PAN nanofibers were discussed. The results show that the average diameters of the PAN nanofibers perpared by this method range from 50 to 80 nm, and the smallest average diameter is 50 nm when the mass ratio of PAN/CAB is 15:85, concentration of spinning solution is 15%, spinning jet velocity is 1.5 mL/h, spinning voltage is 10 kV, and the receiving distance is 20 cm. The equilibrium adsorption capacity of ultrafine PAN nanofibers aftermodification is 833 mg/g.

      Filtration performance of polytetrafluoroethylene fiber electret fabric charged by tribo-electrically
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  22-26.  doi:10.13475/j.fzxb.20170501705
      Abstract ( 741 )   PDF (1458KB) ( 216 )   Save
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      In order to study the effect mechanism of static charge generated by friction in the process on the filtration efficiency of PTFE (polytetrafluoroethylene) fiber nonwoven materials, and prepare high filtration efficiency, a low-resistance nonwoven filter material, PTFE-fiber was selected as the raw material, the puncture nonwoven fabric with different weight were prepared by staple combing and acupuncture. The surface electrostatic potential and the filtration performance of the nonwovens were measured in the range of 0 to 40 days after tribo-charging, and the charge storage stability of acupuncture nonwovens was analyzed. The results show that the PTFE-fiber nonwoven fabric treated by carding and needle punching process have high filtration efficiency and low- resistance. The higher the weight is, the higher the surface potential and the filtration efficiency of the nonwovens. PTFE-fiber filter material charged by taibo-electric with the weight of 220 g/m2 can capture more than 99% particles of 0.26μm, and the electrostatic decay cycle is longer. Water soaking gas little linfluence on the static decay.

      Novel test method and optimization for characterizing the flexibility of monofilaments
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  27-31.  doi:10.13475/j.fzxb.20170304805
      Abstract ( 475 )   PDF (1474KB) ( 160 )   Save
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      In order to solve the problems of complex measurement methods and formula, too large measurement error and limited range for measuring the flexibility of monofilaments, a novel method was designed. The self-designed mold and the unique way of preparing samples were described in detail, and several polylactic acid and polypropylene filaments with different flexibilities were chosen to test the comperssive strength. The method of preparing samples was described, and the influence parameters of different sample number and diameter of presser foot were discussed, so the feasibility of the method using the compressive strength to characterize the filaments flexibility was proved. The results show that the method by testing the compressive strength of fibers can characterize the flexibility effectively, the optimum parameters of the number of sample preparation and the diameter of presser foot are 10 and 10 mm, respectively.

      Mechanism and characteristics of digital rotor spun yarn
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  32-35.  doi:10.13475/j.fzxb.20161200604
      Abstract ( 802 )   PDF (1618KB) ( 113 )   Save
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      In order to develop new varieties of yarns and improve the efficiency of yarn production, the method and principle of digital rotor spinning process were explored in this paper and the color characteristics of its products were studied. During digital rotor spinning process, three rovings were fed by three-component asynchronous feeding rollers, after combed, mixed and drafted by carding roller, mixed again in the rotor under the action of centrifugal force and condensing into sliver, and then twisted and wound forming a special yarn. By this novel process, the linear density and blending ratio can be controlled online with digital controlling system. It can be concluded that single fiber with different colors are well blended during spinning process, and digital yarns show softcolors.

      Test of actual pre-draft ratio of spandex filament in air covered elastic yarn
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  36-40.  doi:10.13457/j.fzxb.20161200105
      Abstract ( 1029 )   PDF (1680KB) ( 261 )   Save
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      In order to test and evaluate the actual elasticity of the air covered elastic yarn, structure and tensile properties of air covered elastic yarns were analyzed, the test method of actual pre-draft ratio of spandex by non-pre-tensioning tensile test was proposed; The typical non-pre-tensioning tensile curve was analyzed, the calculation method of actual pre-draft multiple of spandex was given; the testing and analysis of the air covered elastic yarns with different specifications were carried out. The results show: The tensile elongation of spandex filament can be measured by non-pre-tensioning tensile test, combined with the specimen length of tensile test, the actual pre-draft ratio of spandex filament can be calculated; the measured pre-draft ratios are always less than the nominal pre-draft ratios, the difference between them depends on the pre-draft ratio and the linear density of spandex filament; the bigger the pre-draft ratio of spandex filament, the bigger the difference; the larger the linear density of spandex filament, the smaller the difference.

      Finite element simulation on tensile mechanical properties of three-elementary weave fabric
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  41-47.  doi:10.13475/j.fzxb.20161205107
      Abstract ( 589 )   PDF (1945KB) ( 188 )   Save
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      In order to predict the tensile properties of fabrics, numerical simulations of fabric tensile were studied by using finite element method, and corresponding experiment verification was presented. Firstly, the geometry parameters of the yarns were obtained by observing the morphology of the fabrics with the help of super depth of field digital microscope VHX-5000. Then, the mechanical unit-cell models of the three-elementary weave were built by AutoCAD. Then, based on the experiment of yarn tensile and the periodic boundary conditions, the tensile properties of the three-elementary weave were studied using ANSYS software. Finally, the results of numerical simulations and experiments were compared. The results indicate that the error between the simulated results and the experimental results is about 10%, verifying that numerical simulation using the finite element method is effective.

      Structure and knitting principle of whole garment
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  48-55.  doi:10.13475/j.fzxv.20161106108
      Abstract ( 1208 )   PDF (2189KB) ( 234 )   Save
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      In order to solve the employment problems of linking and promote the development of the whole garment, a research from the respects of whole garment structure,knitting techniques and knitting efficiency. Firstly, the knitting theory on four-bed computerized flat knitting machine was discussed based on whole garment forming theory, knitting action of slide-needle and draw-off device. Secondly, according to the knitting principle of cylinder as the unit, the work proposed the whole garment structure in single cylinder, multi-cylinder and anomalous structure. And it gave examples of three structures. At the end, the key knitting techniques on four-bed computerized flat knitting machine of whole garment, such as rib, forming, sleeve – main body combination, neck ,joining shoulder seam and so on, is analyzed developing the turtle neck sweater of multi-cylinder structure as an example. And compared with pattern fashioning, knitting efficiency of whole garment was advanced more than 40%.

      Bending properties and finite element method simulation of honeycomb 3-D integrated woven composites
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  56-60.  doi:10.13475/j.fzxb.20170400606
      Abstract ( 345 )   PDF (1881KB) ( 136 )   Save
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      In order to solve the poor integrity of common boneycomb composites made by bonding planar materials with pressing, but the integrity of composites was bad. In order to solve this problem, honeycomb three-dimensional integrated woven fabric with triangle section shape were fabricated on common loom by reasonable design. The honeycomb three-dimensional integrated woven composites were prepared by VARTM molding process (vacuum assisted resin transfer molding process). Then, after the comparison of load-displacement curves, maximum load-velocity curves, maximum energy absorption and failure modes of experiments and Abaqus FEM simulation at different speeds, it showed that they had better consistency. It also proved that the Abaqus mode was right, we could use this mode to predict the mechanical properties of honeycomb 3D woven composites with triangle section shape and this provided theory for the honeycomb 3D woven composites in the high impact damage tolerance.

      Compression performance test of three dimensional textile prostheses for hernia repair
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  61-67.  doi:10.13475/j.fzxb.20161006407
      Abstract ( 428 )   PDF (2000KB) ( 159 )   Save
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      Compression performance of three dimensional hernia prostheses was key point in hernioplasties. However, standard for characterization and evaluation system of three dimensional hernia prostheses has not established, in spite of the wide use of three dimensional hernia prostheses in hernioplasties. Compression performance uses for the mechanical characterizing of three dimensional hernia prostheses in the study firstly. The impacts of different test condition on compression performance were analyzed, which will refine the research method for three dimensional hernia prostheses. The results show that the impact of restraining ring and level of compression on compression performance were analyzed. In studying, the optimal parameter three centimeters of restraining ring and 30% level of compression are supposed and used for mechanical characterizing of three dimensional hernia prostheses.

      Preparation and properties of acetoacetylated starch used as sizing agent
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  68-72.  doi:10.13475/j.fzxb.20170300405
      Abstract ( 457 )   PDF (1458KB) ( 106 )   Save
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      In order to make up for the lack of natural starch used as sizing agent in properties, a series of acetoacetylated starches (AASs) with different degree of substitution were prepared by changing the weight ratio of diketene to acid-thinned starch (ATS). The viscosity of sizing liquor, mechanical properties of sizing film, adhesion properties and sizing properties of AAS were studied. The results showed that esterifying modification of acetoacetate is capable of enhancing the mechanical properties of starch sizing film, enhancing the adhesion to fibers. When the degree of substitution is in a range of 0.014 - 0.085, with the increase in the degree of modification, the breaking elongation of AAS film and the adhesion to fibers first increase and then reduce, the tensile strength of AAS film first reduces and then increases. When the degree of substitution is 0.056, the breaking elongation of AAS film reaches the maximum value of 3.88%, the adhesion to polyester fibers and cotton fibers reaches the maximum value of 137.54 N and 69.32 N respectively. The suitable degree of substitution is 0.028-0.071 when AAS is used as sizing agent. Compared with ATS, AAS can further enhance the sizing properties of 13 tex polyyester/cotton ( 65/35) warp yarn.

      Synthesis and properties of water soluble quaternary ammonium cationic starch sizing materials
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  73-78.  doi:10.13475/j..fzxb.20161204606
      Abstract ( 515 )   PDF (1742KB) ( 172 )   Save
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      As starches are usually insoluble in water of medium-low temperature and according to the requirements of medium-low temperature sizing in solubility, sizing viscosity, film-forming properties and adhesion properties to textile fibers involving sizes. In the way of modifying the raw starch by acid hydrolysis, quaternary ammonium cation and ethanol-alkali method, the medium-low-temperature water soluble Quaternary ammonium cationic starch suitable for medium-low-temperature sizing was prepared. The microstructure and properties of the starch were characterized by means of SEM, FTIR, Electrophoretic Analysis. We optimized the effects of reaction temperature, reaction time, dosage of ethanol, water content in on the solubility of the prepared starch in ethanol-alkali method, and the slurry and size film was studied. the mole ratio of starch, water, ethanol and base of 1: 20: 8: 0.4,  reaction temperature was 60℃ and  the reaction time duration for 50min, which are soluble in water at room temperature and have good viscosity and sediment stability.

      Heterogencous exhausting dyeing of cotton fabrics with reactive dye in Pickering emulsion
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  79-83.  doi:10.13475/j.fzxb.20161101505
      Abstract ( 473 )   PDF (1427KB) ( 97 )   Save
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      In order to effectively solve the problems of low dye uptake, a large amount of waste water discharge and high electrolytes content in waste content in waste water caused by the conventional reactive dyeing in water bath, the heterogeneous exhausting dyeing of reactive dye on cotton fabrics in Pickering emulsion was investigated. Organic alcohol ether and hydrophobic SiO2 nanoparticles were used as the dyeing media and emulsifier, respectively. ANOZOL Navy L-3G dye was dispersed into organic alcohol ether and dyed cotton fabrics. Finally, K/S value, fixation and levelness of dyed fabrics were measured. The results show that the optimum process conditions are water content of 15%, time of 30 min, temperature of 70℃, NaSO4 of 0.6%, Na2CO3 of 20 g/L, and nano-SiO2 particles concentration of 1.5%. The fixation of ANOZOL Navy L-3G reactive dye in Pickering emulsion reaches 85%, which is superior to conventional dyeing. The washing and rubbing fastness of dyed fabric are 4-5 and levelness of dyed fabrics is satisfactory .

      Dyeing peoperties of ultrahigh molecular weight polyethylene fibers with disperse dye
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  84-90.  doi:10.13475/j.fzxb.20161202207
      Abstract ( 945 )   PDF (1769KB) ( 197 )   Save
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      In order to dye ultra high molecular weight polyethylene (UHMWPE) fibers, the dyeing properties of methyl yellow disperse dye with high planarity and super hydrophobic structure were studied. the effects of dyeing processes such as temperature, time, pH value and the dosage of AEO-9 on the result of the dyed UHMWPE fiber were investigated. Furthermore, The dyeing kinetics and thermodynamics of methyl yellow dye on UHMWPE fiber were studied. The results showed that methyl yellow dye had good dyeing performance on UHMWPE fiber. The optimization process was achieved at the concentration of dispersant 0.3 %, 130 ℃ for 60 min, pH=5,and the color fastnesses of dyed fiber were higher than rating 3-4. Through simulating and calculating the experimental data, results indicated that the adsorption process of methyl yellow dye onto UHMWPE fiber fitted the Nernst distribution mechanism,the half-staining time was 24.34 min, the diffusion coefficient at 130 ℃ was 5.21 × 10-17 m2·s-1, and the standard affinity is about 5.56 kJ ·mol-1.

      UV-induced grafting dyeing of modified reactive dye on alkali treated polyester fabric
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  91-96.  doi:10.13475/j.fzxb.20161105006
      Abstract ( 459 )   PDF (1677KB) ( 151 )   Save
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      In order to achieve the short-period UV-induced grafting dying of polyester (PET) fabric at ambient temperature, 2-methyl-3-buten-2-ol was applied to modify reactive dye to prepare modified dye monomer and the modified dye was then grafted onto alkali treated PET fabrics via UV-induced method. HNMR, ATR and SEM were employed to characterize the chemical structure of PET fabrics before and after modification and dyeing. The change of wearability of PET fabrics before and after dying was analyzed by testing of color depth, rubbing fastness, air permeability, tensile properties and stiffness. The results showed that compared with untreated and dyed PET fabric, alkali-treated and dyed PET fabric possessed good color depth with ΔE of nearly 14, dry?rubbing?fastnesses of Grade 4 and?wet rubbing fastness of Grade 3-4, and slightly decrease in tensile properties, stiffness and air permeability.

      Preparation of a novel N-P flame retardant and its flame retardant properties in cotton fabric
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  97-101.  doi:10.13475/j.fzxb.20170100705
      Abstract ( 447 )   PDF (1317KB) ( 147 )   Save
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      In order to synchronously realize high-efficiency and low toxicity flame retardant properties in textile polymer materials, and make full use of synergistic effect between nitrogen and phosphorus, with hexachlorotricyclophosphazene(HCPP) as skeletonl, through nucleophilic substitution reaction to introduce cage pentaerythritol phosphate (PEPA) into the HCPP, a novel N-P halogen-free flame retardants(HCPPA) was prepared with product?yield of 66.2%, and its chemical structure was characterized by IR and 1H-NMR, The flame retardant properties in cotton fabric is tested by oxygen index meter and vertical burning instrument. The results showed that when the content of flame retardant is 28%, the limiting oxygen index of HCPPA was up to 35 and the smoldering time was 0.3s, after washing 15 times, the limiting oxygen index of cotton?drill treated by HCPPA, was still as high as 32.5, which shows excellent flame retardant properties and better washing durability. Compared with the hexaphenoxy cyclotriphosphazene(HPCTP)and pentaerythritol phosphate (PEPA) developed recently, HCPP has more excellent flame retardant performance, and is expected to have a better application prospect in the flame retardant industry of textile, plastic and coating.

      Thickness change trend under process parameters in foam cup molding using Box-Behnken design method
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  102-109.  doi:10.13475/j.fzxb.20170200708
      Abstract ( 460 )   PDF (2468KB) ( 311 )   Save
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      In order to reduce the number of trial-and-error in the conventional bra cup molding process and to establish a quantitative analysis mehtod, and expensive scheme with 15 kinds of condition combinations (three factors and three levels) based on the Box-Behnken design (BBD) method was proposed. The soft polyurethane foams were molded to the mold cups by using the contour molding machine. According to the experimental design, the designated sectional thicknesses of molded cups generated under different mould parameters were measured by the Leica optical imaging system. Through the regression equation and the response surface plots, the relationship between molding process parameters and the section thicknesses of molded cups can be explored and the prediction can be made. The results indicate that the molding temperature has greater influence than the length of the dwell time on the section thicknesses of molded cups. From the response surfaces, even though the length of the dwell time was extended, the thickness of the mold cup cannot remain stable if the molding temperature is not high enough. For the given cup depths of different sized mold heads, the optimal molding conditions can be accurately and quickly determined. The efficiency with this approach is 3.6 times of the approach without experimental design and the results are validated by the experiment.

      Intelligent inspection of dominant colors for Chinese traditional folk Yunjian
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  110-115. 
      Abstract ( 542 )   PDF (2063KB) ( 114 )   Save
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      In order to solve the problems of time-consuming and poor accuracy during the process of achievement colors from the images of tarditional costumes, an effective color clustering method was developed for Chinese traditional costumes Yunjian image Mean-shift clustering algorithm. A digital Single Lens Reflex camera is used to capture the costumes images. The sub-images in the three color channels are filtered by median filter separately. Thirdly, the filtered images are segmented based on the background color in the Lab color space, and the object costumes is separated from the background. Fourthly, the pixels of the costume image are classified into several clusters by Mean shift clustering algorithm, and the dominate colors are extracted from the classification results. The experimental results demonstrate that the proposed method can extract the dominant colors from costumes images with great accuracy when the bandwidth of Mean shift clustering algorithm is set as 0.05.

      Specialization of gold thread for textiles from origin of metal wire
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  116-123.  doi:10.13475/j.fzxb.20170101108
      Abstract ( 1233 )   PDF (2481KB) ( 133 )   Save
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      To investigate the origin of gold thread in ancient China, textual research and analysis of metal monofilament used in the stone armours and jade robes during the Qin Dynasty and the Western Han Dynasty were conducted. It was thought that the metal monofilament was the primitive form of the gold thread that was eventually used in textiles, and this could result in the origin of the gold thread as the form of strip gold wire and gold foil sheet hooked or interwoven with fabric. Also it was deduced that during the period of 300~400 years from Qin to Eastern Han Dynasty, the gold thread began to be applied to textiles in ancient China as decorations. According to relevant documentation and analysis of the date of relevant unearthed gold threads and reorganization of the differences of the fabricating methods, the gold thread can be divided into two categories: the “Pian Jinxian” and the “Nian Jinxian”. It could be concluded that the gold threads for textile use have met the level of specialization during the period of the Tang and Song Dynasty by combing all the information. And then, the development of the gold threads for textile use became more large-scale in the Yuan Dynasty and later generations.

      Route planning for concentric spinneret inspection based on improved ant colony algorithm
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  124-130.  doi:10.13475/j.fzxb.20170201208
      Abstract ( 266 )   PDF (2111KB) ( 122 )   Save
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      In order to improve the inspection efficiency of concentric-distribution spinneret, this essay proposes an inspection route planning method based on improved ant colony algorithm. In order to overcome the shortcomings of traditional algorithm including low convergence speed and sinking into local optimum, this method redefines the distance between micropores to meet the characteristic of typical spinneret inspectors, sets up the initial pheromone concentration table by nearest neighbor method to obtain better results with other parameters unchanged, and further optimizes the results through path peaks removal process. To verify the effectiveness of the proposed algorithm, calculation of the path planning for a typical concentric-distribution spinneret was carried out. The results show that the proposed algorithm has higher convergence speed, and it can shorten the path length by about 18% compared with the conventional inspection route and improve the inspection efficiency of matching spinneret.

      Analysis on airflow drag characteristics of yarn with yarn faults
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  131-136.  doi:10.13475/j.fzxb.20160902706
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      In order to study the influence of yarn faults on airflow drags yarn, a assumption simulate short slub yarn faults by spheres and cylinders was proposed firstly according to the shape feature of yarn faults in airflow. The drag force of short slub yarn faults were numerical calculated based on analyze airflow results by Fluent. The drag forces of spheres as model of short slub yarn faults were tested by self-designed testing drag force device for main-nozzle air-jet weft insertion under 0.3 MPa inlet pressure. The rationality of numerical calculation that previous statement was verified , and the consistency was obtained. Finally, the influence effect of short slub yarn faults on drag coefficient was studied. Conclusions were found that the rate of change for coefficient of drag force increased firstly then verged to stabilization gradually with the diameter of yarn faults increasing. In addition, the change rate for coefficient of drag force presented descending tendency gradually with increase of the quantity of yarn faults.

      Kinematics analysis and dimension synthesis of beating-up mechanism for carbon fiber multi-layer loom
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  137-142.  doi:10.13475/j.fzxb.20170102406
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      The axial six-bar linkage beating-up mechanism based on the crank and rocker mechanism with non-quick return characteristics series-connected with the basic linkage group in two revolute joints and one prismatic joint model was proposed aiming at the demand of consistent force-loading to the weft yarn on each layer during the carbon fiber multilayer weaving process. The dimensional synthesis method with the combination of rigid body guidance and the mechanism geometrical relations was also provided. Taking into consideration of the limit position of reed and the force transfer property, the design of beating-up mechanism was optimized, and the feasible size of machine and transmission angle were determined. Simulation results of kinematics show that: the error rate of both the reed limit position and the movement of beating-up mechanism is 0.06%. The reed beating-up has a high acceleration at the front dead center, and the acceleration has few changes near the back dead center, which is beneficial to the tightening of heavy fabric and machine noise reduction. Driven by the axial six-bar linkage beating-up mechanism, the reed exerts perpendicular force to weft yarn on each layer of carbon fiber multilayer fabric. Each layer of the fabric is subject to even force, and the dimensional synthesis method has provided a certain theoretical basis and experimental data for the design and optimization of beating-up mechanism that takes account of specific requirements such as weaving technology, kinetic performance and machine size.

      Concave points matching and segmentation algorithm for overlapped fiber image
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  143-149.  doi:10.13475/j.fzxb.20170202107
      Abstract ( 766 )   PDF (1963KB) ( 121 )   Save
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      In order to identify the different components which are adhered or crossed each other in a hybrid fiber image, a fiber segmentation algorithm based on concave points matching in the overlap area is proposed. The detection of contour corners is firstly obtained by using the classical K-cosine curvature algorithm, the vector triangle area method is also used to find contour concave points from the corner set. For a given concave point, the precursor point (or subsequent point) and the target point are selected to form a triangle. The triangle and other significant features are used to judge whether the concave point and target point are matched. At last, through the connection of the matching concave points, the segmentation of overlapped fiber image can be realized. Compared with the existing algorithms of segmentation, the new method employs a mechanism combined with distance between concave points and triangular construction principle to achieve the purpose of matching. The experimental results show that the algorithm can deal with the situation of adhesive fiber and cross fiber, with high segmentation accuracy over 80% in complex scenes.

      Digital yarn simulation under fiber scale
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  150-155.  doi:10.13475/j.fzxb.20160708606
      Abstract ( 317 )   PDF (1806KB) ( 70 )   Save
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      In order to solve the problem on difficult prediction of digital yarn appearance caused by the complicated color matching of yarn, a simulation method based on fiber unit was presented to complete the simulationof digital yarn. First of all, the texture model of fiber was constructed based on the rawmaterial color values of digital fiber. Secondly, digital yarn appearance area color piece based on the spinning process parameters were calculated. Thirdly, the gradient model was built by using the principle of gradual changes between different components and combining with lighting model simulation luminance information. Finally, the real digital yarn diameter and peofile were collected. It can simulate the different components and color of digital yarn deeping the color and composition unchanged. The results show that the proposed yarn simulataion method xan simulate the appearance of the digital yarn quickly, and the appearance of the vision is very close to the actual digital yaaran, laying a solid foundation for the development of digital yarn and fabric simulation.

      Quantity statistics and size measurement of vamps based on machine vision
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  156-161.  doi:10.13475/20161203906
      Abstract ( 832 )   PDF (2026KB) ( 102 )   Save
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      Focusing on the problems of low efficiency and high cost of artificial detection in vamps statistics and size measurement, a machine vision method of counting and measuring vamps was presented. Using the template matching algorithm based on the edge direction to complete quantity statistics of vamps. The minimum enclosing rectangle algorithm measured the size of vamps was employed. To verify the reliability of the proposed method, three kinds of vamps were detected in illumination changes, clutter and occlusion, the results were compared with Sum of absolute differences, normalized cross correlation and Hausdorff distance matching algorithm; The measurement results of minimum enclosing rectangle algorithm were compared with manual test. The experimental results demonstrate that template matching algorithm based on the edge direction is more robust in complex environment, and it can finish the quantity statistics of vamps; The relative error between the minimum enclosing rectangle method and the artificial measurement is less than 0.67%, which meets the actual needs of industrial production.

      Graphic contour extraction for printed fabric based on Ttxture smoothing
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  162-167.  doi:10.13475/j.fzxb.20160901506
      Abstract ( 484 )   PDF (2181KB) ( 149 )   Save
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      In order to enrich printed products varieties, a method was put forward to effectively extract the contours of the printed fabric with high precision. Firstly, in order to smooth the image, by controlling the degree of smooth parameters and space scale, can eat off the fabric texture and structure of the image. Edge detection pattern with a Canny edge detection operator, Canny discriminant threshold segmentation of the default automatic threshold choice, can successfully segment the pattern on the fabric, after segmentation of image contour clear, continuous, edge and can segment the small structure in the images of the printed fabric. Experiments prove that in RGB color space of image smoothing and segmentation effect is superior to other color space, compared to other edge detection operator splitting pattern effect of printing fabrics, the results prove that Canny operator segmentation effect is best, segmentation results can be directly used in the production of printed fabric.

      Research Progress in preparation and application of electrospinning porous carbon nanofibers
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  168-176.  doi:10.13475/j.fzxb.20161204209
      Abstract ( 990 )   PDF (2824KB) ( 253 )   Save
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      To provide experimental data and theoretical basis for the preparation of subsequent porous carbon nanofibers, the latest research progress on the feasibility of industrialization by electrospinning preparatio methods, pore struture tpes and application of electrospun porous carbon nanofibers at home and abroad were reviewed. Two kinds of preparation methods and their principles of electrospun porous carbon nanofibers including blending of polymer and polymer and blending of polymer and inorganic particles are expounded, and the structural characteristics of the porous carbon nanofibers prepared by these methods were also described. Then, according to the shape of the hole structure, the structure types of porous carbon nanofibers were divided into hollow, mesoporous, hierarchical pore and carbon shell-honeycomb core, etc. Finally, the application prospects in the fields of electrochemistry, hydrogen storage, catalysis and adsorption, and the future perspectives for porous carbon nanofibers were concluded as well.

      Research progress on textile finishing with assistance of supercritical carbon dioxide
      JOURNAL OF TEXTILE RESEARCH. 2017, 38(11):  177-184.  doi:10.13475/j.fzxb.20161201908
      Abstract ( 688 )   PDF (2404KB) ( 176 )   Save
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      In order to pooly supercritical carbon dioxide (CO2) on textile finishing, the comprehensive analysis on supercritical CO2 from basic peinciples, influence factors, property alteration with finishing, and applications in textile finishing at home and abroad were carried out. The result show that the important factors influencing textile finishing with supercritical CO2 are the solubility of finishing agent and the state of aggregation of fibre. In addition, the change of  temperature and pressure also greatly infuence finishing with supercritical CO2. The state of aggregation of fibre would generate a series of changes after finishing, and then lead to properies change. The distribution and content of finishing agent in fibre or textile will greatly influence the finishing effect. Besides the application of supercritical CO2 on the finishing of synthetic fibers, the research of natural fiber finishing and special functional finishing with supercritical CO2 should be strengthened.