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Table of Content

    15 September 2016, Volume 37 Issue 09
    • Water resistance of β-cyclodextrin/polyacrylate nanofiber films and their supramolecular capturing performance for heavy metal ions
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  1-5. 
      Abstract ( 597 )   PDF (1295KB) ( 271 )   Save
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      To get a novel water-resistant membrane materail to capture the heavy metal ions in waste water, β-cyclodextrin(β-CD) and polyacrylate(PA) were blended to prepare nanofiber film with electrostatic spinning technology. The surface morphology of nanofibers was observed through scanning electron microscope(SEM) and the effect of β-CD content on the surface morphology was discussed. Meanwhile, the capturing performance of nanofibers for heavy metal ions was studied and the capturing mechnism was analysed initially by SEM of nanofibers before and after capturing. The results showed that the water absorption of PA film kept 8% after 30 minutes which meant favotable water-resistance. When the concentration of PA was 10%, the bonding between monofilaments in nanofibrous film improved greatly with β-CD content increasing. When the concentration of PA and β-CD were 10% and 50%, the capturing amount of nanofibrous film for copper or ferrum ions was 82.0 or 219.5mg/g respectively. There were obvious copper ions gathering on the surface of nanofibrous film after capturing.

      Preparation and characterization of plasticizing melting system consisting of cellulose diacetate and plasticizers
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  6-11. 
      Abstract ( 727 )   PDF (1514KB) ( 304 )   Save
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      Cellulose diacetate (CDA) has high melting temperature, and is an important dervative of cellulose. In HAAKE Rheocord, the plasticizing melting systems of cellulose diacetate (CDA)/ ionic liquid 1-ethyl-3-methylimidazolium acetate ([EMIM]Ac) and CDA/ EMIM]Ac/ dimethyl sulfoxide (DMSO) were prepared. The curves of temperature-time and torque-time in the process of two plasticizing melting systems were analyzed respectively. The structures and performances of the plasticizing melting systems were investigated by XRD, TGA and rheometer, respectively. The results show that, [EMIM]Ac is so effective a plasticizer for CDA that the plasticizing melting system of CDA/[EMIM]Ac is a homogeneous one. DMSO insteaded of the part of [EMIM]Ac, which not only can reduce costs, more to promote plasticizing effect of [EMIM]Ac. The melt processing stability of the plasticizing melting system of CDA/[EMIM]Ac and CDA/[EMIM]Ac/DMSO is good because their thermal decomposition temperature is well above their melt flow temperature, although their thermal decomposition temperature are lower than that of raw CDA.

      Structure and property of methanol protein modified viscose fiber
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  12-15. 
      Abstract ( 272 )   PDF (926KB) ( 253 )   Save
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      In order to improve the added value of visscose fiber, viscose fiber modified by methanol protein was prepared by blending methanol protein and viscose concentrate, and its structure and performance were investigated by means of kjeldahl nitrogen determination apparatus, infrared spectra (IR), scanning electron microscopy (SEM), X-ray diffraction (XRD) and fiber mechanical properties experimental methods. The results show that compared with ordinary viscose fiber, the crystallinity of the methanol protein modified viscose fiber decreased, cross section abnormity degree slightly lowerde, zigzag trend abate, burnish is slightly darker, fiber fracture strength is reduced, and the elongation at break decreased. The fiber shows characteristics of protein fiber and it can be viewed from the infrared spectrum of the fiber and fiber nitrogen content test results that methanol protein modified of viscose fiber has been a successfully prepaerd.

      Filtration and mechanical performance of orange petal shape bicomponent spunbond-spunlace nonwoven materials
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  16-20. 
      Abstract ( 609 )   PDF (1286KB) ( 339 )   Save
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      In order to achieve orange petal shape bicompinent spunbond-spunlace nonwovens with excellent comprehensive filtration and mechanical properties, single factor experiment was adopted to investigate the influence of fiber web density on pore size, filter performance, tensile properties and tear properties of the bicomponent nonwovens, The surface and cross-section morphologies of bicomponent fibers and spunbond-spunlace nonwovens were also observed. The results show that the cross section morphologies of bi-component fibers was orange petal shape, and the fibers in surface of nonwovens were mostly split into superfine fibers, while the intermediate fibers kept complete hollow structure.  The mean pore size of bicomponent spunbond-spunlace nonwovens was between 7 and 10 μm and decreased with increase of web density, and the filtration efficiency increased correspondingly. The web density had remarkable influence on the longitudinal and lateral tensile, elongation and tearing properties of bicomponent spunbond-spunlace nonwovens. With the increase of the webdensity, the above mechanical properties were all enhanced, but these properties also existed difference between longitudinal and lateral directions due to the web peocessing method.

      Evaluation and veasurement of precision for raw silk linear density test
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  21-25. 
      Abstract ( 303 )   PDF (1193KB) ( 215 )   Save
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      To evaluate the precision (the repeatability and the reproducibility errors) of raw silk size test using raw silk size tester, and find the affecting extent of heterogeneous material on test precision, and obtain the precision data of size test for different specifications of raw silk when the sampling size is 200 skeins with each skein having a length of 100 revolutions (112.5 meters), the study designed two different test schemes. The first scheme is that a cycling comparison trial among five labs is done on one same sample, the other is that five labs test five different samples from the same lot of raw silk respectively. The test data show that the precision level is very high when using the same sample, and the average coefficients of variation of the repeatability and reproducibility errors are less than 2%, while the average coefficients are above 10% when using different samples. Therefore, it can be concluded that the heterogeneity of material has great effect on the precision of raw silk size test, and the heterogeneity of material should be considered in evaluating and measuring the precision of raw silk size test in order to obtain the accurate precision level of the actual test.

      Design of double face dobby fabric by using stitching double weave
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  26-30. 
      Abstract ( 326 )   PDF (1189KB) ( 175 )   Save
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      Aiming at solving the problem of single pattern effect for dobby textiles, this paper presents a design method of double face dobby fabric with pattern effect based on stitching double weave. This approach is derived from the design principle of double face dobby fabric with pattern effect. The method is accomplished by double face dobby textile and color effect. The first way , dobby textile of face and back fabric is designed firstly, then face and back of fabric are connected by stitching double weave; the second way ,the texture of face and back fabric are designed firstly, the weave combined with color yarn arrange formed color effect dobby textiles, the face and back of fabric are connected by stitching double weave finally. Both methods were accomplished by the principle of stitching double weave, and  the face and back of fabric is independent relatively. Such design modified the convention of backed weave.

      Electromagnetic shielding and wrinkle recovery property of cotton / stainless steel filament woven fabric
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  31-36. 
      Abstract ( 330 )   PDF (1724KB) ( 154 )   Save
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      In order to study the electromagnetic shielding properties and wrinkle performance of the cotton / stainless steel filament woven fabrics, cotton/stainless steel filament core spun yarns were used to make three kinds of fabrics, including plain, 1/2 twill, and 1/3 twill weave. The electromagnetic shielding properties in 0.3-1500MHz are compared. After the wear tests for 60, 120, 180, 240 and 300 times on the textile abrasion tester, the electromagnetic shielding properties are also tested and compared. The wrinkle recovery properties are tested by video sequence method. Results shows that, the fabric weaves have some effects on the electromagnetic shielding property. Because of the compact structure, plain fabric has a higher SSE. Through several times of friction, the SSE has a small increase, then decrease gradually. At the same wear condition, samples will have a lower reduction degree of the shielding effectiveness, which have better performance of the wear resistance. Because of the stainless steel filament, the fabrics have lower wrinkle recovery properties. The fabric weaves which have longer float could improve the wrinkle performance.

      ABAQUS based finite element analysis of heat transfer through woven fabrics
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  37-41. 
      Abstract ( 811 )   PDF (1279KB) ( 303 )   Save
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      In order to expand the research approaches of woven fabric design, evaluation and optimization of thermal comfort, a effective method to predict the thermal resistance of fabric was provided.The numerical simulation of heat transfer through fabric in one direction was investigated according to heat transfer theory and fabric?3D models, and the temperature distribution in dynamic heat transfer process was described. A geometric model of plain weave fabric was established based on geometrical structure parameters using microscopic image and slicing techniques . The fabric system was assembled by fabric model and still air model around the yarn. The boundary conditions and the interaction were set according to simulation condition and the numerical solution was calculated by the finite element analysis software ABAQUS.The constant temperature flat test simulating the skin heat lose was conducted to verify the validity of the heat transfer model, the results show that the outside surface temperature from simulations and experiments had a good consistency over the time, the error range between the theoretical thermal resistance and the experimental one is 3.9%, and the two results coincided very well.

      Influence of weave parameters on warp-knitted run-in values
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  42-47. 
      Abstract ( 406 )   PDF (1230KB) ( 206 )   Save
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      To improve prediction accuracy of warp knitting run-in values, run-in values of 38 samples with 5 different weave parameters were measured. Then, experimental results were analyzed by SPSS19 to research the relationship between run-in values and fabric weave parameters. Moreover, a multiple linear regression model for forecasting run-in values were suggested. It is indicated by the result that both of overlap shogging and underlap shogging have significant positive correlation with the run-in values; both of take-up density and machine gauge have negative correlation with run-in values; run-in values are slightly positive affected by total rate of threading; The impact significance of the 5 factors from big to small is in the order of underlap shogging, overlap shogging, take-up density, machine gauge and total rate of threading. Furthermore, a multiple linear regression model was obtained to provide reference for predicting run-in values.

      Bursting properties of warp knitted jacquard spacer fabrics
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  48-52. 
      Abstract ( 463 )   PDF (1171KB) ( 172 )   Save
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      The samples were of 8 warp knitted spacer yarns with discuss the different mesh sixes and basic patterns wereselected to descuss the difference of bursting properties. The bursting curve characters and bursting strength of different fabrics were analyzed. The bursting mechanism and impact of bursting strength and reduction from jacquard surface and spacer-layer were analysed. The results showed that that  plain layer has an influence on the first stage of bursting process but the facquard plain is second. The bursting strength was decided by jacquard surface structure and thick structure was greater than that of thin structure. The bursting strength was inversely proportional to the length of the mesh. The spacer structure played a buffer role during the bursting process and increased the fabric reduction. This research provides design consideration and theoretical research foundation for the application of warp knitted facquard spacer fabrics in clothing industry.

      Static anti-compression performance of knee protector
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  53-58. 
      Abstract ( 372 )   PDF (1435KB) ( 213 )   Save
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      In order to decrease the damage on the knee of the elderly due to falling down, warp knitted spaced fabric was fabricated,  and the experiment on static anti-compression performance of polyurethane foam was carried out with the Instron tester. This paper aims to study the knee protective system for the elderly, using the Instron tester AGS-J from Tianjin Polytechnic University to study the static compression performance. This conclusion can be found: for PU sponge, spacer fabric, a certain density of PU and some special structures of spacer fabrics can meet the requirement of the energy release during the fall. Especially, for the spacer fabric, when the internal pressure is above 30Kpa, the buffer coefficient comes to the minimum, and the anti-compression performance of spacer fabric comes to the best.

      Fabric defect detection using monogenic wavelet analysis
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  59-64. 
      Abstract ( 440 )   PDF (1764KB) ( 190 )   Save
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      In order to overcome the poor adaptability of existing fabric defect detection algorithms on numerous kinds of defects, especially the ones appearing as minor texture changes, a fabric defect detection algorithm based on monogenic wavelet analysis was proposed. The monogenic wavelet analysis on fabric images works with the Riesz?Laplace wavelet, which is generated by performing Riesz transform to an isotropic Laplace wavelet constructed by combining a fractional Laplacian and a polyharmonic spline. For the multiresolusional orientation and amplitude subbands outputted by monogenic wavelet analysis, respective criteria for the best responses and segmentation method on the best response subbands were designed. Experiment results showed that the proposed detection algorithm could effectively segment various kinds of defects in different fabric textures, consequently demonstrating the position and shape of defects, and achieved a detection rate of 97.37% on 342 experimental sample images, bearing a sound self-adaptability and robustness.

      Composite technologies on 3-D honeycomb structural textile
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  65-69. 
      Abstract ( 600 )   PDF (1555KB) ( 237 )   Save
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      During the composite processes for the 3-D honeycomb structural textiles, problems such as the difficulties in forming the composite and hard to de-mould after the composite is cured. Therefore, the author was trying to improve the traditional hand lay-up process and vacuum assisted resin transfer (VARTM) process to open the 3D honeycomb structural composite successfully. By adapting the methods such as inserting various preforms in the cells of the honeycombs to consolidate the structure; or by adjusting the positions and number of the resin injections for the fabric to be immersed completely; or by replacing the metal preforms by wax preforms to open the fabric layers, then melting the wax afterwards to produce the 3D honeycomb structural composites. After all the above three trials, the author finds that if the hand lay-up technology is employed to make the composite sample, the quality of the product is hard to control and the thickness among various samples could be in the error of 60%, however, if the VARTM technology combined with wax is adopted to make the composite, a well presented 3D honeycomb structural composite can be obtained.

      Periodic boundary conditions for mechanical property analysis of 2-D woven fabric composite
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  70-77. 
      Abstract ( 519 )   PDF (1965KB) ( 261 )   Save
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      In order to accurately implement the numerical analysis for the mechanical properties of two-dimensional (2-D) woven fabric composite, the accurate boundary condition of unit cell model should be established. Based on the periodic boundary condition theory, a set of simple and universal periodic boundary equations was proposed for the 2-D woven fabric composite, and the solving method of elastic constants for engineering in the finite element analysis under the periodic boundary conditions was given. In order to verify the correctness of periodic boundary conditions, the nine-block-box structure including 9 unite cells of 2-D fabric composite were established. Taking the central cell as the reference cell, the deformation and stress distribution of the single cells under different boundary conditions were compared with the reference cell. The results indicate that all boundary surfaces of the fabric composite do not keep planar state, but present the concave and convex buckling deformation under uniaxial tensile load. In other words, the periodic property of the unite cell boundary faces is demonstrated. Furthermore, the engineering constants of the 2D woven fabric composite can be obtained properly under the periodic boundary conditions.

      Influence of polyethylene oxide molecular weights on sizing performances of pre-oxidized polyacrylonitrile staple warps
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  78-83. 
      Abstract ( 532 )   PDF (1393KB) ( 320 )   Save
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      In order to develop the single yarn fabrics woven from pure staple warps of pre-oxidized polyacrylonitrile (POPAN) to avoid the defects of POPAN filament and blend fabrics, an operation for sizing pure POPAN staple yarns was proposed to improve their weavability for producing the fabrics. By using polyethylene oxide (PEO) as sizing agents, the effect of molecular weights on the sizing performances of pure POPAN staple warps was investigated. The relationship between PEO molecular weights and its paste viscosity, adhesion-to-fiber, film performances, desizing efficiency, and yarn properties such as the increase in tensile strength, loss in elongation, abrasion resistance, and decrease in hairiness of sized yarns was explored. The results showed that the properties of these sized yarns could be improved by increasing the molecular weights in the range considered. Based on the viscosity, adhesion, desizability, film performances, and properties of sized yarn, the PEO with the molecular weights range of 1.0×105~1.5×105 can be recommended for sizing pure POPAN staple single yarns before weaving process.

      Dyeing properties of cationic modified cotton fibers
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  84-89. 
      Abstract ( 711 )   PDF (1205KB) ( 273 )   Save
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      During cationic cotton fabric salt-free dyeing process, the high initial dyeing rate could easily lead to uneven dyeing, influence of surfactants on dyeing peoperties of cationic modified cotton fabrics was studied. Different types of surfactants were used as retarding agents, and compared the anionic-nonionic surfactant?CE-1 with those retarding agents, by calculating the initial dyeing rate(3min) and the dyeing rate(30min), the retarding mechanism and retarding effect of different types of surfactant were mainly discussed under the condition of 6%(o.w.f) dyes. The result shows that compared with other types of surfactants, the initial dyeing rate is reduced effectively with anionic-nonionic surfactant CE-1, and the reduction of dyeing rate(30min) is less. When the mass concentration of CE-1 is 0.8g/L, the dyeing rate of 3 minutes is 22.5% ,decreased by 18.2% and the dyeing rate of 30 minutes is 60.8%, decreased by 10.6%.

      Heat stability of estercatechins and their dyeing effects on silk
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  90-93. 
      Abstract ( 310 )   PDF (973KB) ( 223 )   Save
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      In order to illustrate the oxidation and polymerization of estercatechins and their effects on the coloring performanceof solk, the heat stability of EGCG,GCG and EGCG was analyzed by UPLC-Q-TOF/MS. The results showed that when estercatechins were heated, their conversion rates were different. Moreover, the conversion rate of ECG was highest and GCG was the lowest when one component existed. However, when two or more ingredients coexist, their synergistic effects beween GCG and ECG were stronger and theru conversion rates were similar. The dyeing effects of EGCG, GCG and ECG in silk were also analyzed, It is  found that the catechin absorpted rate of silk was ECG>GCG> EGCG when dyeing at the same proportion, and the catechin absorpted rate of silk was nearer. Besides, it was proved that the coloring strength of EGCG and GCG were stronger when dyeing with different proportions. Through comparing, ECG was more suitable to be used as plant dyeing agent because its heat stability would not affect the adsorption rate, and its coloring degree was lower.

      Synthesis of modified-polyethyleneimine/nano-silver composites and antibacterial threrof on cotton fabrics
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  94-99. 
      Abstract ( 542 )   PDF (1447KB) ( 164 )   Save
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      In order to improve the reduction capability of nano-silver by polyethyleneimine (PEI) and stabilize the nano-silver solution, a modification of PEI by chemical grafting was described in this paper. The mechanism of modified-polyethyleneimine (MPEI) was proposed, and its antibacterial application in finishing of cotton fabrics was studied. According to FT-IR, the carboxyl acid ion and the amide bond were introduced into PEI successfully by chemical reactions. XPS, UV-visible and particle size analysis showed that MPEI can not only can synthesize nano-silver efficiently, but also stabilize nano-silver solution for a month at least. TEM test indicated that nano-silver synthesized by MPEI contained ultra-small spherical nanoparticles with an average diameter of 2 nm and larger particles with a average diameter of 10 nm. Under conditions of room temperature and atmosphere pressure, the bacterial reduction rates of cotton fabrics treated with MPEI/nano-silver solution against Escherichia coli and Staphylococcus aureus reached 95%.

      Preparation and application of fluorine-containing acrylate copolymer emulsion as finishing agent
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  100-105. 
      Abstract ( 395 )   PDF (1581KB) ( 221 )   Save
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      In order to explore the application effects of fluoropolymer on linen fabric, a fluorine-containing acrylate copolymer emulsion was prepared by semi-continuous seeded emulsion copolymerization using dodecafluloroheptry methacrylate (G04) as modified monomer, butylacrylate (BA) and methylacrylate (MMA) as soft and bard monomer, respectively, and acrylic acid sa functional monomer; ana it was applied to finishing linen fabric. Structure and properties of the product were characterized and analyzed by FTIR, TEM, PSD and CA tester, respectively. Water and air permeability and breaking strength of the treated fabric were investigated. The result showed that the obtained fluorine-containing acrylate copolymer emulsion had a core-shell structure, and the microsphere size was at nanometer. After the linen fabric was treated with fluorine-containing copolymer, the contact angle to water was up to 130°, and the breaking strength of fabric was increased. The water and air permeability of  fabric decreased slightly.

      Developing of chest wader lining oriented to working environment
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  106-110. 
      Abstract ( 435 )   PDF (1405KB) ( 291 )   Save
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      In order to improve the microclimate of the chest wader and the operation comfort of fisherman, according to the characteristics of underwater environment and combined with the fabric and high water absorption resin materials, this paper developed a chest wader lining through focusing on the human body sweating distribution characteristics. Through testing the water absorption, moisture permeability and conductivity of the fabric, and simulating underwater pressure environment, the water conductivity from the fabric to high water absorption resin material could be explored, and thus appropriate fabric could be selected accordingly. According to the difference in sweating rate and sweat gathering area, the combination of high moisture conductivity fabric and high water absorption resin material and high moisture absorption fabric could be set respectively. Velcro was used at the chest wader edges, which made the combined lining detachable. The results of field evaluation on the designed wader chest lining showed the moisture comfort of chest wader in long time works had been improved significantly.

      Application of Huaiyang clay dog art form in pattern design of men’s shirt
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  111-116. 
      Abstract ( 294 )   PDF (1717KB) ( 224 )   Save
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      In order to apply Huaiyang clay dog in modern apparel design, the typical art forms including model, color and pattern were pattern were concluded in detail. Meanwhile, in combination with modern popular elements, three pattern creative methods about Huaiyang clay dog appearance were discussed, and the application of defferent pattern arrangements in men's shirt was analyzed. Finally, the important influence of national elements on design of modern men's apparel was elaborated. The research results show that for both innovation and application of the Huaiyang clay dog pattern, on the one hand, the combination of various art forms needs to be paid attention, and at the same time the modern popular elements should also be considered by creative combination of model, color, size, position and quantity. On the other hand, the position relationship between pattern area adn apparel should be suitable, and at the same time apparel style and manufacture should also be considered.

      Analysis of skin deformation of rider during cycling under different road conditions
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  117-122. 
      Abstract ( 308 )   PDF (1373KB) ( 165 )   Save
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      In order to ezplicit the skin deformation of a rider when cycling under different road conditions and body postures, four body postures during three different road conditions were analyzed. The skin deformation was measured during the process. Research results were as followed. The shoulder breadth reduced to -14.26% under downhill condition, the back width increased to more than 25% under normal and downhill conditions, and the waist girth increased to the most downhill condition and to least under uphill condition. The chest, thigh and calf girths changed not more than 3%.  The front of upper body reduced in levels, and the deformation was more than -10% under normal and downhill road conditions. The back of upper body increased no more than 5%. The front length from waistline to calfline was reduced, but its lateral length was not changed too much.

      Detection method for speed synchronization of drawing frame rollers
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  123-128. 
      Abstract ( 522 )   PDF (1101KB) ( 204 )   Save
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      A roller synchronization detecting system based on virtual instrument technology is proposed to detect the speed synchronization of rollers of a drawing frame. The system is composted of DAQ cards, PCs and roller speed curve testers. The speed calculation method based on M/T is proposed and the roller speed tester is designed in LabVIEW environment. The detection system bas been successfully used on detecting performance of the drawing frame FA1382. The results show that the detection system can acquire accurate data and data is highly versatile and intuitive. Data analysis show that the drawing frame has good draft performance, but it has also some aspects to be further improved such as nonlinear speed down in normal stop and time control of slowdown in emergency stop. This detection system provides more effective quantitative reference data for judging the performance of drawing frame and improving drawing frame.

      Influence of auxiliary nozzle and profiled reed in air-jet loom on flow field
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  129-133. 
      Abstract ( 445 )   PDF (1366KB) ( 214 )   Save
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      In order to deeply understand the properties of weft inaertion flow dield of auxiliary nozzle and the effects of correlative structure parameter, and further provide basis for improving the craftwork of weft insertion, the flow field model of a combination of auxiliary nozzle and profiled reed is built a ccording to the actual condition of weft insertion. The numerical simulation is carried out by the computational fluid dynamics software called Fluent. The velocity distribution curve of the combinational flow field centerline is obtained and the rationality of numerical simulation is verified by experiment. On this basis, further research about the effect of the the underlip obliquity of profiled reed and the distance between auxiliary nozzle and profiled reed on the combinational flow field is implemented. The results showed that experimental velocity is lower than simulative velocity at the outlet of auxiliary nozzle, but they are in good agreement as a whole. When the air supply pressure is 0.3 MPa and 0.4 MPa, the air velocity performance of 12 degrees and 3 degrees of the underlip obliquity is optimal, respectively. Moreover, the suitable distance between auxiliary nozzle and profiled reed is 9 mm or 10 mm.

      Evaluation standards and program implementation on damage status of carbon fiber warp weaving
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  134-139. 
      Abstract ( 249 )   PDF (1770KB) ( 267 )   Save
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      In order to online monitor damage status of carbon fiber during weaving with upper control system for further providing important references to adjust the loom speed and change the yarn tension and even check stands, a set of applicable evaluation standard and implementation method on damage status of carbon fiber during weaving were put forward. According to the fuzzy control theory, the input and the output of the fuzzy algorithm were analysed and fuzzy rules were also put forward. The realized program can provide evaluation of single yarn damage degree with the Matlab fuzzy logic toolbox. By calling Matlab procedure the evaluation of regional yarn damage is implemented on Labview software platform. The error of damage evaluation results between evaluation algorithm and artificial experience judgment is small. The evaluation standard and implementation method are feasible.

      Flow resistance of pipe network for transporting thermal oil in dyeing and printing industry
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  140-144. 
      Abstract ( 279 )   PDF (1060KB) ( 181 )   Save
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       The increase of pipeline resistance of heat transfer oil heation system during dyeing and finishing process would lead to great temperature difference between import and export. Theoretical calculation and analysis about pressure drop, local resistance and frictional resistance of the heating syste was carried out taking an enterprise as an example. The results show that the total pressure loss of hot oil pipeline is1 980 kPa. The frictional resistance increased 278 kPa as the gel adhesive on the inner wall of the tubing, accounting for 14.05%. Therefore, the resistance of oil pipeline is mainly caused by heat conduction oil heating cycle system. When the designed temperature difference between oil import and export is 25 ℃ and  the oil speed is 2.38 m/s, the heat conduction oil colloids can increase the resistance loss of 575 kPa. It is suggest that the heat conduction oil pipe should be cleaned when it is in use more than one year.

      Numerical simulation for 3−D flow field of rotor spinning channel
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  145-150. 
      Abstract ( 310 )   PDF (1906KB) ( 332 )   Save
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      In order to explore the impact of cohesion within the rotor slot type flow field, Solidworks was used to build three-dimensional geometric model rotor spinning channel, and the Fluent computational software was used to numerical simulation the fluid flow field within the spinning channel. According to the calculation results, the distribution of flow field including pressure distribution and velocity field in the spinning channel were analyzed. The simulation results show taking U-shaped groove as an example. The results show that the vast majority in static pressure within the rotor is ranged from −8 287.91 Pa to −2370.92Pa and ?8287.91 Pa, and a small part of the high-pressure zone exists in the outlet slot interchange and cohesion of cotton channel. Cotton within the transport channel airflow was accelerated,  and reaches a maximum value of about 220m/s at the outlet. Under the same conditions, in comparison with the U-shaped groove, the speed and static pressure of the V-groove are higher, the cohesion between the sliver fiber cohesion is closer, and the twist is easier to bi transferred leading to higher strength of the yarn.

      Optimum and application of automatic cotton blending based on high volume instrument data by improved genetic algorithm
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  151-155. 
      Abstract ( 1048 )   PDF (1204KB) ( 238 )   Save
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      Aiming at the characteristics of multi-constraints condition and the deficiency of the existing automatic cotton blending, the improved genetic algorithm is applied to linear programming optimization problem. By improving generation strategy of the initial population, genetic operators and evolutionary convergence condition, constraint conditions of cotton blending will be fused dynamically with the evolution process so as to optimize automatic cotton blending. The experimental results show that the solution of the improved genetic algorithm is superior to that of the basic genetic algorithm and all index values of cotton blending are in line with the requirements of production technology. The cost of cotton blending can be reduced effectively under the premise of meeting the quality of mixed cotton. It also provides a new method and technical reference for the process design of cotton blending.

      Motivation of textile industry transfer under context-structure-conduct-performance paradigm
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  156-161. 
      Abstract ( 828 )   PDF (1469KB) ( 194 )   Save
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      To better understand the influencing factors of textile industry transfer at a micro level, the paper probed into different motivating factors affecting the textile industry transfer by questionnaire investigation and in-depth interviews based on the premise of heterogeneity of basic elements such as capital, labor and products, and the parakigm of context-structure-conduct-performance (C-SCP) . An empirical study has made on 64 firms or enterpeises at bome and abroad, and the results showed that first, costs and political cnvironment are the tow mwst important factors affecting international buyers to choose suppliers; second, product prices has been relegated to the second and service has become the primary factor among motives of the domestic peoducers to carry out the transfer of profuction; third, in terms of international buyers' order transfer and domestic profucers capacity transfer, Southeast Asia has become the main area.

      Review of studies on textile wicking modeling
      JOURNAL OF TEXTILE RESEARCH. 2016, 37(09):  162-168. 
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      Textile wicking models perform the bridge connecting the capillary ststem with the macroscopic textile wicking behavior. Presently, quite a lot of textile wicking models exist, and their theoretical basis and application range are waried and przzling to most people. Thus, existing models were classified and reviewed. The testing methods and influencing factors of textile wicking pwoperties were primarily summarized, and then textile wicking models were classified into three groups according to their basic principles. For each group, the saaumed condition, theoretical principle, and applied range were descussed. Firstly, the capillary-force based models were built up based on the opinion of macroscopic force balance, whereas the idealized capillary model performed far away from the realistic capillary system that are commonly hierarchical and complex, thus application of capillary-force based models was limited so far. Secondly, the pressure based models were built based on the Washburn equation and generally to analyze the pressure and pressure difference combined with the Laplace equation and Poiseuille law. The pressure based models were usually used to predict the flow, welocity of flow, and distance of the fluid through textile structures. Yarn and fabric were usually considered as one unit in the pressure based models, and empirical data of the structural parameters were adopted as representatives of corresponding structures. Hence the pressure based models could be modified to be suitable for more kinds of textiles. Thirdly, the energy based models were built based on the principle of conservation of energy and were usually used to analyze the degree of energy conversion during a wicking process. Finally, the development directions of studies on textile wicking modiling were predicted.