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Table of Content

    15 December 2018, Volume 39 Issue 12
    • Nonisothermal crystallization kinetics of novel nylon-carbon chain polyamide 1211
      Journal of Textile Research. 2018, 39(12):  1-6.  doi:10.13475/j.fzxb.20180105706
      Abstract ( 635 )   PDF (1624KB) ( 170 )   Save
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      Aiming at the problems that the mechanical properties of polymer were influenced by themicrocrystalline structure, polyamide 1211 was prepared by one-step polymerization, and the mechanicalproperties of polyamide 1211 were ontrolled by controlling the microcrystalline structure thereof. The nonisothermal crystallization of polyamide 1211 was studied by differential scanning calorimeter. Nonisothermal crystallization kinetics of polyamide 1211 was studied using the Avrami equations modified by Jeziorny method and Mo method. The results obtained by Jeziorny method exhibit that the nonisothermal crystallization kinetics of polyamide 1211 comprises two stages. The Avrami index is ranged from 2. 51 to 3. 22 during the main crystallization stage process, and the crystal grows in a twodimensional disk state. In the sub crystallization stage process, the Avrami index is 0. 99 -2. 14, and the crystal grows in a one-dimensional fiber state. The cooling rate value is 14. 91 -37. 57. In addition, the activation energy of nonisothermal crystallization for polyamide 1211 acquired by Kissinger method is -115 kJ/mol.

      Chitosan based nanofiber drug loaded system and its sustained release behavior
      Journal of Textile Research. 2018, 39(12):  7-12.  doi:10.13475/j.fzxb.20180202906
      Abstract ( 855 )   PDF (2112KB) ( 208 )   Save
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      To develop antibacterial materials with sustained release effect, chitosan (CS), polyvinyl alcohol (PVA) and ciprofloxacin were used to prepare a drug loaded CS/ PVA composite nanofiber membrane by electrospinning. The influence of spinning system and process parameters on the micromorphology, contact angle and chemical structures of the nanofiber membrane were explored, as well as the in vitro drug delivery behavior and antibacterial capability before and after drug loading. The results indicate that the addition of PVA enhances the spinnability of CS and the hydrophilicity of the nanofiber membrane. Nanofiber membranes with high uniformity and good modality are obtained when the applied voltage is 24 kV and the mass ratio of CS and PVA is 1 ∶ 1. 5. The drug loaded CS/ PVA composite nanofiber membranes exhibit a relative low release rate, which can effectively avoid burst release. In addition, the rate of drug release rises with the increase of ciprofloxacin concentration in nanofiber membranes. The results of antibacterial experiment show that drug loaded CS/ PVA nanofiber membrane has excellent antibacterial activity against staphylococcus aureus.

      Preparation and antibacterial properties of electrospun core shell nanoscale packaging films
      Journal of Textile Research. 2018, 39(12):  13-17.  doi:10.13475/j.fzxb.20180106305
      Abstract ( 568 )   PDF (1795KB) ( 195 )   Save
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      In order to solve the embedding of essential oil in antibacterial packaging, a nanofiber membrane with carboxymethyl chitosan (CMCS) as the shell and thyme essential oil as the core was prepared by an emulsion electrostatic process. The effects of viscosity, electrical conductivity and particle size of the electrospinning emulsion on nanofiber were studied. The microscopic morphology of the fiber membrane was observed by scanning electron microscopy and transmission electron microscopy. The bacteriostatic properties of the fiber membrane were tested by the inhibition zone method. The results show that carboxymethyl chitosan and poly (ethylene oxide) at a mass ratio of 9∶ 1 is used as the aqueous phase solution, thyme essential oil is used as the oil phase and Tween 80 is used as the emulsifier. When the volume ratio of the three materials is 36. 7:4:1 or 22. 8:4:1, a stable emulsion structure can be formed. Under the ectrospinning conditions of spinning solution flow rate of 0. 5 mL/ h, voltage of 16 - 24 kV and spinning distance of 11 cm, thyme essential oil is successfully coated in carboxymethyl chitosan fiber, and the adhesion phenomenon decreases with the voltage increase. The inhibition zone diameter of the core-shell nanofiber membrane for Staphylococcus aureus, Escherichia coli, Botrytis cinerea and Penicillium is 18. 2, 11. 0, 32. 5 and 29. 2 mm respectively, and the bacteriostatic effect is good.

      Bionic horizontal branching structure of PEG/PP microfibers material and liquid diffusion properties in horizontal direction
      Journal of Textile Research. 2018, 39(12):  18-23.  doi:10.13475/j.fzxb.20180201506
      Abstract ( 615 )   PDF (2176KB) ( 61 )   Save
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      In order to enhance liquid diffusion properties in horizontal direction of the melt blown materials with microfibers. The samples of PEG/PP melt blown microfiber materials were made by the polyethylene glycol (PEG) modified polypropylene (PP) with blend-modification. The fiber fineness distribution, arrangement morphology, the upper and lower wetting time and the moisture welts area tested were tested. The results show that, fibers with different fineness are random distributed in horizontal direction, and multiple nanofibers attach the microfibers, which forming the horizontal branching structure. The fibers above 2000Nm form the primary branches, the microfibers with 800-2000nm consist the second branches, and the nanofibers below 800nm compose the third branches. The network density of the third branches can be adjust from the 1.86 to 4.20 by increasing the ratio of PEG (0%~20%) and melt spinning temperature (230~250 C). The upper and lower wetting time and moisture welts area vary with network density of the third branches, the upper wetting time decreases from 3.234s to 2.215s with network density increase from 1.86 to 4.2.
      Low temperature plasma treatment of basalt filament surface and sizing strand integrity thereof
      Journal of Textile Research. 2018, 39(12):  24-29.  doi:10.13475/j.fzxb.20170900306
      Abstract ( 576 )   PDF (2032KB) ( 174 )   Save
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      In order to solve the poor adhesion between basalt fiber and sizing solution due to smooth surface, poor strand integrity, chemical inertness and low fiber wettability, low temperature plasma technology was used to modify the surface of basalt filament to improve its sizing strand integrity. The influence of discharge power, discharge pressure and discharge time on the morphology, static and dynamic friction factors and mechanical properties of basalt filament were studied,and the morphological structure of the modified basalt filament was characterized by scanning electron microscopy. Moreover, the relationship between the modified filament and the textile size adhesion performance was investigated. It was found that the low temperature plasma modification can increase the surface roughness, specific surface area and friction coefficient of the basalt filament, which leads to the higher adhesion between basalt filament and textile sizes. In addition, the modified basalt filament have good sizing adhesion and strand integrity under the optimal conditions of discharge power 300 W, pressure 30 Pa and time of 7 min.

      Correlation analysis on relationship between short fiber content of  card sliver and yarn parameters
      Journal of Textile Research. 2018, 39(12):  30-36.  doi:10.13475/j.fzxb.20180300907
      Abstract ( 496 )   PDF (1860KB) ( 108 )   Save
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      To explore the influence of short fiber content (SFC) in card sliver on yarn parameters and make a prediction, the card sliver and yarn were produced under different speeds of cylinder and takein. The card sliver was tested with USTER AFIS and less than 10, 12, 14 and 16 mm SFC were calculated, respectively, according to fiber length distribution of card sliver. The evenness, hairiness and strength of yarn were tested by unevenness tester, hairiness tester and strength tester, respectively. The correlation coefficients between 4 SFC parameters and yarn parameters with SPSS were calculated. The results show that a high correlation exists between SFC and evenness parameters, but a little correlation exists between SFC and strength parameters, even negative correlation in hairiness parameters, so it is predicted that the yarn quality is necessary according to SFC of card sliver based on actual carding technology.

      Influence of yarn rupture work on performance of warp knitting
      Journal of Textile Research. 2018, 39(12):  37-40.  doi:10.13475/j.fzxb.20180100905
      Abstract ( 873 )   PDF (1566KB) ( 155 )   Save
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      In order to better understand the mechanical properties of yarn for warp knitting, yarn tensions during warp knitting and rupture work of yarn were studied. The idea of yarn rupture work to evaluate the warp knitting performance was suggested. The 14. 58 tex cotton yarn, 9. 72 tex compact siro-spun cotton yarn and 8. 33 tex (72 f) polyester filament were selected, and the yarn tension and mechanical performance were tested. Tensile properties of these yarns were transformed by angle domain, and tension work of each knitting cycle was calculated. Combining with the analysis of the yarn rupture work, it is found that the cotton yarn tension is close to the rupture work, while the polyester tension is far less than the rupture work. The greater the difference between yarn tension and yarn fracture work, the stronger the yarn warp knitting adaptability

      Layer-exchanging design and practice of double-face two-layer jacquard fabric
      Journal of Textile Research. 2018, 39(12):  41-46.  doi:10.13475/j.fzxb.20180106606
      Abstract ( 959 )   PDF (2201KB) ( 188 )   Save
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      For the interchanging design single problem of the surface structure and the inner structure in double-face jacquard fabric with a two-layer structure, a new layer-exchanging design method was presented by analyzing double-face and two-layer jacquard fabric structure features based on layeredcombination design mode. Innovative effect of double-face and two-layer jacquard fabric was realized by separating and recombining structures, yarns and patterns from surface and inner layers. And the application of layer-exchanging in the double-face jacquard fabric was divided into basic design and shifty design. The design practices show that the new layer-exchanging design method presented can realize innovative structuring, coloring and patterning effect on face and back sides of double-face jacquard fabric with related process parameters unchanged, providing a new design idea and way for the innovative design of double-face two-layer jacquard fabrics

      Design and performance of knitted suit fabrics
      Journal of Textile Research. 2018, 39(12):  47-52.  doi:10.13475/j.fzxb.20180106006
      Abstract ( 1259 )   PDF (1875KB) ( 204 )   Save
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      In order to solve the lack of flexibility of the woven suits and unsatisfactory wearing comfort, and improve the wearing performance of the suit fabrics in well apply the knitted suit fabrics in the market, the application of the suit fabrics were deeply researched, and the design and development of the knitted fabrics and related performance testing were investigated. The results show that cotton fiber content is high, and the air permeability is higher than 70 -210 mm/ s. As far as moisture permeability is concerned, the cotton suit fabric is 300 - 400 g/ (m2·d) higher than that of the wool suit fabric. The wrinkle recovery angle of the cotton-type suit fabric is about 5° higher than that of the wool-style suit
      fabric, and the rebound resilience is superior. According to the different advantages of different materials of the suit fabrics, combining with its wear performance, the fabric can be widely used as seasonal business apparel. The researched and developed knitted suit fabrics has better performance and advantages.

      Geometric model design and integrated formation algorithm of integrally formed socks based on human foot features
      Journal of Textile Research. 2018, 39(12):  53-58.  doi:10.13475/j.fzxb.20180102806
      Abstract ( 640 )   PDF (1747KB) ( 86 )   Save
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      In order to make the computerized design of toe-closed fully-fashioned socks more efficient and standardized, based on the in-depth structure of the socks process principle, combining with the feet structures and motion features of the human body and the requirements for functions and wearable performance of knee socks and footlet, a parameter model for the production of integrally formed socks was extracted by establishing a design method of a knee socks model and a footlet model. By applying the established models into knitting female sports socks and footlet, it is proved that the 2-D pattern models can be used for designing integrally formed socks, and by transforming these models, various styles and types of socks can be produced. The application shows that the socks geometric model based on human foot features optimizes the integrally-formed socks algorithm, meeting the demands of foot arch of wearing socks.

      Microwave assisted preparation and sizing properties of carboxymethyl corn starch
      Journal of Textile Research. 2018, 39(12):  59-66.  doi:10.13475/j.fzxb.20171103708
      Abstract ( 774 )   PDF (2676KB) ( 82 )   Save
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      In order to obtain an excellent sizing effect for cotton high-count yarn, a hydrophilic modified starch size-carboxymethyl corn starch (CMCS) was synthesized from natural corn starch, chloroacetic acid and sodium hydroxide as raw material, etherifying reagent and catalyst by a microwave-assisted process. The molecular structure and granular morphology of the products were characterized by FT-IR and SEM. The results show that carboxymethyl groups are successfully introduced into corn starch macromolecule and starch granules are damaged by varying levels and their integrity is destroyed. The studies for physicochemical properties of CMCS show that the intrinsic viscosity and apparent viscosity of CMCS decrease, rheological property is enhanced, the solubility, swelling power, paste clarity and retrogradation resistance are improved, the blue value reduces, suggesting the degradation of amylase. The gelatinization temperature decreases, which indicates that gelatinization properties and paste processing performance are improved. The results of the adhesion experiment show that the adhesion force of CMCS is enhanced by as much as 27. 9% compared with nature corn starch(NCS), and the adhesion force increases with the increase of degree of substitution. The results of sizing experiments on 9. 67 tex pure cotton yarns show that the mechanical properties of CMCS sized yarns are significantly improved, the tensile strength enhancement and abrasion resistance enhancement increase by 118. 5% and 88. 7%, respectively, and the elongation reduction is 29. 7% lower than that of NCS sized yarns.

      Adhesion properties of quaternary ammonium cation-esterified dodecenylsuccinic anhydride-etherified starch size
      Journal of Textile Research. 2018, 39(12):  67-71.  doi:10.13475/j.fzxb.20180502206
      Abstract ( 637 )   PDF (1796KB) ( 58 )   Save
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      In order to enhance the adhesion properties of starch size, quaternary ammonium cationesterified dodecenylsuccinic anhydride-etherified starch was prepared. The chemical structure was characterized by infrared spectrometer. The adhesion properties, the surface tension and the Zeta potential of its slurry were studied. The results show when the total degree of substitution is about 0. 045, with the increase of the mole fraction of ester group to total substituents, its adhesion force to fibers firstly increases and then decreases, the surface tension of its slurry firstly decreases and then increases, and the Zeta potential of its slurry decreases from positive to negative. When the mole fraction of ester group to total substituents is 60%, the adhesion force to cotton fibers and polyester fibers reaches the maximum value of 75. 32 N and 126. 83 N, respectively. When the mole fraction of ester group to total substituents is about 60%, with the increase of the total degree of substitution, it can significantly enhance the adhesion to polyester fibers and cotton fibers, and the surface tension of its slurry gradually decreases, but when the total degree of substitution is greater than 0. 045, the adhesion properties are no longer enhanced significantly.

      Influence of pretreatment process on luffa fiber′s properties
      Journal of Textile Research. 2018, 39(12):  72-77.  doi:10.13475/j.fzxb.20171101706
      Abstract ( 619 )   PDF (1931KB) ( 72 )   Save
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      In order to exploit the utilization value of luffa fiber resources, steam explosion, combined enzyme process and chemical process were adopted to treat natural luffa fiber, and the effect of different treatment processes on luffa fiber′ s properties was investigated. Scanning electran microsoope and thermogravimetric analyzer were used to analyze the surface morphology structure, degumming rate, chemical composition, thermal property and moisture absorption and release properties of luffa fibers before and after treatment, and the moisture absorption and release curves of luffa fibers were drawn. The result shows that the treated luffa fibers all have a large number of grooves in the surface, and the chemical treatment effect is the most obvious. The fibers subjected to the steam explosion treatment have the lowest degumming rate of 20. 00% and cellulose content is 54. 61%. The fibers subjected to the chemical treatment has the cellulose content up to 81. 10%, and the effect of the enzyme treatment is the second. The lignin content of luffa fibers subjected to the three treatment process are all high. The moisture regain of luffa fiber increases with the increase of the degumming rate, the curves of moisture absorption and release of luffa fibers treated by the three processes have substantial consistent rule. The pretreatment facilitates the improvement of thermal stability of luffa fibers. The higher the degumming rate, the higher the thermal decomposition temperature.

      Preparation and photocatalytic degradation decoloring of TiO2 / reduced graphene oxide composites
      Journal of Textile Research. 2018, 39(12):  78-83.  doi:10.13475/j.fzxb.20171203706
      Abstract ( 705 )   PDF (1677KB) ( 174 )   Save
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      In order to compare the photocatalytic degradation decoloring performance of TiO2 / reduced graphene oxide (rGO) composites and TiO2, TiO2 of different crystal forms and TiO2 / rGO composites were prepared by the hydrothermal method using tetrabutyl titanate as a precursor. TiO2 and TiO2 / rGO composites were characterized by ultraviolet diffuser, Fourier transform infrared spectroscopy, Raman spectrography, X-ray diffractometer, scanning electron microscope and so on. The degradation decoloring effect of Reactive Red 3BS dye by mixed crystal TiO2 and mixed crystal TiO2 / rGO composites were analyzed. The results show that mixed crystal TiO2 with coexisting anatase and rutile can be prepared under of hydrothermal reaction at 150 ℃ for 12 h and calcination at 650 ℃ for 4 h. Under alkaline conditions, pure brookite TiO2 can be prepared under hydrothermal reaction at 140 ℃ for 72 h without calcination. Mixed crystal TiO2 with coexisting anatase and rutile has certain degradation decoloring effect on Reactive Red 3BS dye. The degradation decoloring rate of mixed crystal TiO2 / rGO composites is up to 99% after 120 min.

      Electrical conductivity of silk fabrics finished with graphene
      Journal of Textile Research. 2018, 39(12):  84-88.  doi:10.13475/j.fzxb.20171001005
      Abstract ( 693 )   PDF (1582KB) ( 173 )   Save
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      In order to obtain washable high-conductivity textile materials, graphene oxide (GO) was used for the electrical conductive finishing of silk fabric by in-situ reduction. The influence of concentration of GO, pH value of GO solution, dosage of reducing agents, ultrasonic time and concentration of sodium dodecyl benzene sulfonate on the conductivity of the silk fabric was discussed. The conductive durability of the reduced graphene oxide (rGO) conductive silk fabric was analyzed, and the morphology of the silk fabric was characterized by scanning electron microscope. The results show that under the condition of GO of 15 g/ L, pH value of 5, reductant of 5 g/ L, ultrasonic treatment time of 30 -
      60 min, the surface electric resistance of silk subjected to in-situ reduction is reduced to 1. 372 kΩ/ cm, and the conductivity of rGO coated silk fabric is excellent. The surface of silk is covered by GO sheets completely, and the surface electric resistance of the silk fabric is slightly changed after 20 times of standard washing or mechanical rubbing.

      Preparation and performance of self-cleaning fabrics based on Ag/TiO2 photocatalysis
      Journal of Textile Research. 2018, 39(12):  89-94.  doi:10.13475/j.fzxb.20171204106
      Abstract ( 872 )   PDF (1919KB) ( 203 )   Save
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      In order to prepare self-cleaning fabrics based on photocatalytic mechanism, Ag/ TiO2 visible light response photocatalyst were prepared by using pyrrole (Py) as monomer and silver nitrate as a silver source, performing chemical oxidation polymerization on the surface of commercial TiO2 to form a silverdoped PPy-Ag/ TiO2, and high temperature calcining to remove PPy. The Ag/ TiO2 visible light response photocatalyst was coated on PAN fiber by co-dispersion and dip-coating, and fabrics were prepared by twisting and plying. The structure and properties of the fabrics were studied by scanning electron microscopy, Fourier transform infrared spectroscopy, thermogravimetry and ultraviolet-visible
      spectroscopy. The results show that Ag/ TiO2 particles are successfully deposited on the surface of PAN fiber with the load quantity about 3. 17%. More importantly, Ag/ TiO2 coated PAN fabrics have good visible-light catalytic degradation to methylene blue, Rhodamine B and red wine under visible light, respectively. Ag/ TiO2 coated PAN fabric show a significant self-cleaning effect. After washing for multiple times, the Ag/ TiO2 coated PAN fabrics still maintain good self-cleaning effect, showing good washing fastness and durability.

      Conductivity of polyaniline / chitosan / wool composite fabrics and molecular simulation for aniline adsorption
      Journal of Textile Research. 2018, 39(12):  95-100.  doi:10.13475/j.fzxb.20180201006
      Abstract ( 716 )   PDF (1956KB) ( 100 )   Save
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      In order to improve the conductivity of polyaniline/ wool composite conductive fabric, polyaniline (PANI) was deposited on the surface of wool fabric in one step by in-situ polymerization using carboxylic acid and hydrochloric acid as doping acid. The influence of CTS dosage on the structure and electrical conductivity of composite fabrics was investigated by field emission scanning electron microscopy, X-ray photoelectron spectroscopy and four probes. The micro motion process of aniline adsorption was simulated by molecular simulation, and the micro mechanism of CTS enhancing the conductivity of PANI/ wool composite fabric was further studied. The results indicate that the conductivity
      of PANI/ CTS/ wool composite conductive fabric reaches 11. 32 S/ cm with addition of 2. 05% (o. w. f) of CTS. Non-uniform electric field distribution on the surface of keratin molecules leads to non-uniform adsorption of aniline, while the amino protonation of CTS contributes to aniline adsorption in the weak current field, leading to more overall adsorption of aniline, better uniformity, and more uniform and dense PANI layer by polymerization, which improves the conductivity of the composite fabrics.

      Design and experimental study on steel needle gripper of replacement of Z directional steel needles in three-dimensional fabric
      Journal of Textile Research. 2018, 39(12):  101-106.  doi:10.13475/j.fzxb.20171102406
      Abstract ( 733 )   PDF (1694KB) ( 104 )   Save
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      In order to overcome the defect of manual replacement of steel needles and the defect of conventional gripper during the operation process, a special steel needle gripper for the replacement of steel needles was designed. The device comprises a wedge block, a thin walled elastic gripper, etc., and the pressure of the wedge block on the thin walled elastic gripper causes the elastic deformation of the thin walled elastic gripper, which is converted into a pressure on the steel needle, meeting the requirements of gripping steel needles. The special steel needle gripper has a high degree of automation and accurate positioning, and can quickly achieve gripping and relaxation. By the force analysis of the working process of the steel needle gripper, it guarantees that the replacement of steel needle is reliable and continuous. In order to verify the feasibility of the working principle, an experiment for the gripping replacement of steel needle was designed. The result shows that the steel needle gripper has feasible principle and reliable operation.

      Design of three-dimensional complex shaped overall braiding chassis device
      Journal of Textile Research. 2018, 39(12):  107-112.  doi:10.13475/j.fzxb.20171204706
      Abstract ( 716 )   PDF (1888KB) ( 105 )   Save
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      In order to improve the automation degree of three-dimensional special-shaped overall braiding to thereby improve the braiding efficiency, by analyzing existing general methods and mixed style braiding method for three-dimensional special-shaped preforms and a chassis device capable of realizing specialshaped braiding, a driving device using a stepper motor as the fixed guide rail was proposed. By combining with the positioning function of direct urrent lectromagnet at both ends of the guide rail, the control of DMC5400A four axis trajectory card, IOC1280 IO expansion card and STM32F103 microcontroller was adopted to realize the chassis device capable of automatically braiding various pecialshaped
      preforms. The structural composition and working process of special-shaped braiding of the chassis device were analyzed. The results show that the braiding process using the chassis device in combination with the control system can realize the flexible manufacturing of special-shaped preforms, and has broad application prospects.

      Structural optimization of presser foot and needle bar mechanism of embroidery machine based on structural topology optimization
      Journal of Textile Research. 2018, 39(12):  113-117.  doi:10.13475/j.fzxb.20171009405
      Abstract ( 659 )   PDF (1522KB) ( 114 )   Save
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      Aiming at the excessive flexibility impact and the destruction of the steady state of the machine due to sudden acceleration change of the presser foot mechanism and needle bar mechanism of the high speed embroidery machine, the paper firstly analyzed the movement rule of the presser foot mechanism and needle bar mechanism under high speed based on kinematics. Further, according to the analysis of the motion rule, the structural topology optimization based on the independent continuous mapping and finite element technology were used in the presser foot mechanism and needle bar mechanism. The discrete variable factor was transformed into a continuous function, and then the part was optimized by mapping to reflect 0 or 1 in the parts of subdomains. Several main components with excessive flexible impact forces were studied. They were divided into different grid areas, named subdomains (unit). The quality factors of each subdomains were defined by using topology variables, and the mass of the major parts with a flexible impact was reduced on the basis of mass balance. The engineering examples show that this method can meet the requirements of light quality and reduce the effect of flexible impact.

      Design and application of three-dimensional parametric technology in construction of new forms of modern clothing
      Journal of Textile Research. 2018, 39(12):  118-123.  doi:10.13475/j.fzxb.20171202006
      Abstract ( 822 )   PDF (1989KB) ( 128 )   Save
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      In order to break the monotonous single structure of the existing clothing and give the modern clothing more possibility of three-dimensional space, by the three-dimensional parametric technology, a changing logical structure for the new form of garment construction was constructed, and threedimensional modeling software Rhino in combination with Grasshopper was used to adjust the threedimensional structure of clothing and garment. According to the aesthetic needs of curve and surface modeling, adjustments were gradually made. The results show that on the basis of the outer garment outline, the three-dimensional modeling software Rhino is used to establish garment pieces as the basic modeling form, which conforms to the perfect curvature of the human body. The use of "Diamonds"and "Triangles" in the control board can make the rhythmic rhythm of each garment piece more rational and full of scientific and technological sense. The grid structure of the upper body of the garment is completed by means of point interference, and the grid structure of the lower body is completed by means of line interference. In the rendering process, by means of adding white diffuse reflection materials, more vivid and realistic fashion clothing modeling can be obtained.

      Transient simulation of magnetic latching needle selector based on Ansys
      Journal of Textile Research. 2018, 39(12):  124-130.  doi:10.13475/j.fzxb.20180201107
      Abstract ( 730 )   PDF (1946KB) ( 62 )   Save
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      In order to optimize the performance of the magnetic latching needle selector and get the optional driving parameters of the needle selection, Ansys was used as a tool of numerical analysis, and the simulation model of the magnetic latching needle selector was established. The simulation and the experiment results of the oscillating motion law and the torque variation low of the bit of the needle selector under the driving of pulse voltage were compared, and the rationality of the simulation model was verified by the experiment. On this basis, the influence of the key parameters of a semi-hard magnetic core on the performance of the needle selector was investigated. The results show that the increase of remanence and coercivity will increase the speed of the needle selection, but the increase of coercivity will reduce the starting speed of the needle selection. On the other hand, a test platform for the performance testing of the needle selector was set up, the performance of the needle selection factors driving voltage and pulse width were analyzed by comprehensive experimental method, and the drive key point was obtained when the voltage was 24 V and the pulse width was 300 μs, which provides a reference for the actual driving parameters.

      Research progress of wearable technology in textiles and apparels
      Journal of Textile Research. 2018, 39(12):  131-138.  doi:10.13475/j.fzxb.20180200308
      Abstract ( 1624 )   PDF (2765KB) ( 534 )   Save
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      In order to facilitate application of wearable devices in textiles and apparels and promote the industrialization in the field of smart clothing, the materials, preparation methods, processes of wearable devices developed in recent years were systematically introduced. According to the current research status of wearable devices in the field of textiles and apparels, the development history of wearable devices was also introduced. At the same time, the wearable devices were classified firstly in this field. The development of several typical flexible wearable devices such as signal sensing, collection and transmission devices, energy harvesting and management devices and textile antennas were described in
      details. Finally, some problems existing in wearable devices were further analyzed. Meanwhile, the development trends and prospects for wearable devices were forecasted.

      Fabrication of polylactic acid tree-like nanofiber membrane and its application in filtration
      Journal of Textile Research. 2018, 39(12):  139-144.  doi:10.13475/j.fzxb.20180801206
      Abstract ( 684 )   PDF (2153KB) ( 248 )   Save
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      In order to develop nanofibers with efficient air filtration performance, polylactic acid (PLA) tree-like nanofiber membranes were prepared by electrospinning. The effects of solvent type, addition amount of tetrabutylammonium chloride (TBAC) and spinning voltage on the morphology and properties of fiber membranes were investigated. In addition, the effect of TBAC addition and fiber membrane thickness on filtration efficiency was also studied. The results show that when the solvent is dichloromethane, the PLA/ TBAC mass ratio is 8 ∶ 1, and the spinning voltage is 30 kV, the fiber membrane has obvious tree-like structure. The fracture stress and quality factor of fiber membrane with obvious tree-like structure are 23 MPa and 0. 068, respectively, which is higher than 5 MPa and 0. 059 of the pure PLA fiber membrane. With the increase of the TBAC content, the contact angle of fiber membrane decreases from 118° to 54. 5°. For PLA nanofiber membranes with distinct tree-like structure, when the thickness of the fiber membrane increases from 10 μm to 40 μm, both filtration efficiency and pressure drop increase, especially, when the film thickness is 20 μm, the filtration efficiency of the fiber membrane is 99. 89%, and the resistance is about 96. 08 Pa, which can meet the demand for efficient air filtration.

      Physical properties and mass preparation and application of carbon nanotube fibers
      Journal of Textile Research. 2018, 39(12):  145-151.  doi:10.13475/j.fzxb.20180806607
      Abstract ( 812 )   PDF (2274KB) ( 261 )   Save
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      In order to better understand the development of carbon nanotube (CNT) fiber, the recent progresses of CNT fibers in physical properties and mass preparation in recent years were reviewed. Based on the preparation of CNT fibers, the forming methods and the enhancement methods of mechanical, electrical and thermal properties of CNT fibers were analyzed. The development process of the mass production of fiber was introduced, and existing problems were summarized. The advantages, the applications and the potential application fields of CNT fibers as a structure and function integrated material were represented, and the future main development trend was proposed and prospected according to the current industry status. CNT fibers as one of nanofiber materials with the largest industrialized potential is expected to be applied in the fields of aerospace, vehicles, ships and the like, providing powerful material and technical support for structure and function integrated materials in the military and civil fields in China.

      Research status of flexible strain sensor based on electrospun nanofibers
      Journal of Textile Research. 2018, 39(12):  152-157.  doi:10.13475/j.fzxb.20180805707
      Abstract ( 701 )   PDF (2341KB) ( 509 )   Save
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      In order to systematically analyze the effect of design methods and material types of electrospun nanofiber strain sensors on the sensing performance, and further clarify the sensing mechanism thereof, the preparation methods of strain sensors based on carbon nanofibers, polyvinylidene fluoride and polyurethane were described, and the advantages and defects of these strain sensors were compared in terms of gauge factor, strain range, stability, and so on. The research status and development trend of electrospun nanofiber strain sensors in human body movement and health monitoring were introduced. The results indicate that the strain capacity and recovery of the sensor matrix greatly influence the strain range and stability of the sensor. The structure of conductive network formed by the conductive matrix is prone to structural damage during the strain process, and the smaller the initial resistance, the larger the effective strain range of the matrix and the conductive network, and the better the performance of the sensor. The development of electrospun nanofiber strain sensors with high strain range, sensitivity and stability is an important goal in the future.

      Microfluidic spinning technology for multifunctional nanofibers and application and research progress thereof
      Journal of Textile Research. 2018, 39(12):  158-165.  doi:10.13475/j.fzxb.20180900708
      Abstract ( 994 )   PDF (2811KB) ( 377 )   Save
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      In order to popularize the microfluidic spinning technology, the preparation mechanism of microfluidic spinning technology and its application in the preparation of fluorescence hybrid microfibers were reviewed. Besides, microfluidic spinning technology was compared with electrostatic spinning technology, melt spinning technology as well as gas jet spinning technology in terms of preparation mechanism, process parameters, fiber morphology ( bamboo fibers and Janus fibers) and structure characteristics, providing the theoretical reference for microfluidic spinning technology. Furthermore, the application of microfluidic spinning technology in the fields of fluorescent coding, optical sensing and
      multi-signal analysis was introduced. Finally, the defects of microfluidic spinning technology and the prospect of future development were summarized and prospected.

      Review on processes of nanofiber prepared by polymer melt method
      Journal of Textile Research. 2018, 39(12):  166-174.  doi:10.13475/j.fzxb.20180802309
      Abstract ( 445 )   PDF (2685KB) ( 459 )   Save
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      Aiming at the present status of low production efficiency, unstable performance and incapability of realizing large-scale application of nanofibers produced by polymer melt method, the current processes of preparing polymer nanofibers by melt were reviewed. First, current melt preparation methods of nanofiber were classified, compared and analyzed based on the principle of melt method. By combining the present research status, it was suggested that the combination of single nanofiber preparation methods is the development tendency of the preparation of melt nanofiber. Then the relationship between process parameters and fiber fineness was reviewed in detail, and the common problems in melt nanofiber preparation were revealed. In the end, the achievements and main processes of melt differential electrospinning were introduced. The large-scale production of nanofiber with the average diameter below 500 nm is realized by analyzing the mechanics, optimizing the process parameters of melt differential electrospinning technology as well as modifying materials.

      Bubble electrospinning and industrial production of nanofiber
      Journal of Textile Research. 2018, 39(12):  175-180.  doi:10.13475/j.fzxb.20180806106
      Abstract ( 663 )   PDF (1955KB) ( 174 )   Save
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      In order to meet the requirements of rapid, efficient, stable and simple preparation of nanofibers, bubble spinning and the development of the bubble spinning were introduced in this paper, the research achievements of bubble spinning technology and various bubble spinning equipment′ s principle were reviewed, and the advantages and disadvantages of these bubble spinning was also discussed. Through in-depth analysis of the process and principle of bubble spinning, various improvement methods were put forward and a variety of different bubble spinning devices were obtained. Aming at resources saving and environmental protection requirements, the blown bubble spinning was developed, which is safer and more convenient to use air flow instead of high voltage. Due to meet industrial production, a novel bubble electrospinning equipment was developed, its output was ten times that of single needle electrospinning, the industrial production of bubble spinning nanofibers was realized. Soon the critical bubble electrospinning was put forwarded. The novelty method not only avoids the waste of resources but also greatly reduces the loss of energy when bubbles burst. It also further improves the efficiency of spinning. The practices show that the bubble spinning technology is a kind of spinning method with simple equipment, convenient operation, low cost, high production efficiency, wide applicability, and suitable for industrial production of nanofibers.