Table of Content

15 August 2017, Volume 38 Issue 08

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Preparation and properties of phosphorus-containing flame retardant polyacrylonitrile fiber

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  1-5.  doi:10.13475/j.fzxb.20170104905

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In order to prepare halogen-free flame retardant polyacrylonitrile (PAN) fibers, the vinyl acetate (VAc) unit in P (AN-co-VAc）fiber was selectively hydrolyzed with KOH aqueous solution at different pH values. The phosphorus-containing flame retardant P (AN-co-VAc) fibers were prepared by the phosphorylation reaction of O,O-diethylphosphoryl chloride with the hydrolyzed P (AN-co-VAc) fiber. The structure of P (AN-co-VAc) fibers was characterized by Fourier transform infrared spectroscope, and the thermal properties of the fibers were studied by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The charbon residue of the phosphorus-containing flame retardant P (AN-co-VAc) fiber was analyzed by scanning electron microscope. The results show that the VAc unit is quickly hydrolyzed with the increase of pH. DSC analysis indicat that the presence of VAc increases the temperature of cyclic exothermic peak, and Tp reaches to 287 ℃ with the mass fraction of VAc of 30%, while the temperature of the flame retardant polyacrylonitrile fiber can be up to 340 ℃. TGA demonstrates that the charbon residue of the flame retardant fibers at 800 ℃ is over 48%, which is higher than that of the control fiber (41%),  fully proves that the flame retardant P (AN-co-VAc) fiber has good charon forming capability.

Crystallization behavior and mechanical properties of electrospun polyester/palm fiber-based activated carbon composite 

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  6-10.  doi:10.13475/j.fzxb.20161006105

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In order to enhance the mechanical properties of electrospun (PET) membranes, the PET/palm fiber-based actived carbon fiber(PET/PACF) composite fibrous membranes were prepared by adding PACF in PET solution, and electrospinning. The effect of the content of PACF on the morphology, crystallization behavior and mechanical properties of the PET/PACF composite fibrous membrane were studied. The results show that the addition of PACF obviously improves the drafting effect of fiber, so that node-like fiber eliminates, the adhesion between fibers reduces and the reduces and the fiber diameter becomes more uniform. The glass transition temperature and crystallinity are increased by 10 ℃ and 6.7% along with the PACF content increasing, respectively. It is indicate that PACF can enhance the drawing effect of the electric field to jet flow to improves the orientation degree. The crystal temperature increases by 13.7 ℃ showing that the heterogeneous nucleation effect of PACF promote the crystallization of fibrous membrane. Aolng with the increasing of the crientation degree, when the PACF content is 2.5%,  the tensile strength of the PET/PACF membranes reaches 4.22 MPa, increases by 366.3% compared with pure electrospun PET membrane.

Relationship between fractal structure and warmth retention properties of wool fiber assembly

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  11-15.  doi:10.13475/j.fzxb.20160806405

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Wool fiber assembly is a porous media whose structure is too complicated to be characterized. To solve this question, the concept of fractal was introduced to fiber assembly. A box-counting method was used to calculate fractal dimension, and a flat fabric heat retention tester was adopted to test thermal properties of wool fiber assemblies. Then quantitative relation between the fractal dimension and basic structural parameters and also thermal properties were acquired. Results indicate that fractal dimension is applicable in characterizing structure of fiber assemblies, and increasing with the increased of the fiber mass and volume fraction, showing more complicated structure. Furthermore, the CLO and warmth retention rate increase with increasing of the fractal dimension, while the heat transfer coefficient tends to decrease, i.e. the warmth retention property of fiber assemblies is enhanced.

Study on the concentration and recovery of cellulose solvent N-methylmorpholine-N-oxide by vacuum menbrane distillation

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  16-22.  doi:10.13475/j.fzxb.20170103307

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Aiming at the large energy consumption and low recovery rate of the conventional concentration process for cellulose green solvent N-methylmorpholine-N-oxide(NMMO), this paper proposed a method for concentration and recovery NMMO based on vacuum membrane distillation (VMD). The influences of vacuum degree,  feed-liquid flow rate, feed-liquid temperature and feed-liquid concentration on the VMD process were investigated, and the feasibility of deep concentration and the system operating stability were studied. The results indicated that the membrane distillaation flux increases with the increase of vacuum degree, feed-liquid temperature and feed flow rate, and decreases with the increase of feed-liquid concentration; while the permeate concentration decreases with the increase of  vacuum degree, but has no obvious dependence on feed-liquid temperature, feed-liquid flow rate and feed-liquid concentration. The VMD process can successfully concentrate 100 g/L NMMO into 467.2 g/L, and the system maintains good operating stability in the operation process of 5 concentration preiods totally for 60 h , has the rejection coefficient to NMMO always maintained at above 99.88%. The VMD process has good technical feasibility feasible.

Preparation and properties of nonwoven loofah

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  22-27.  doi:10.13475/j.fzxb.20161102606

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For the better development of loofah fiber resources and the preparation of environmentally friendly antibacterial materials, this paper analyzes the loofah chemical composition and designs an experimental scheme to extract loofah fiber using alkali. This paper also explores the impact on the extraction yield from the alkaline charge, extracting temperature, holding time, and liquid ratio. By experiment,  the optimum conditions for fiber extraction temperature, alkaline charge 10%, extracting temperature 170℃, holding time 60 min, and liquid ratio 1：6. The wet nonwoven was prepared by using the extracted loofah fiber, and its physical properties and antibacterial properties wrer tested. The result shows that the loosening degree is 2 429.2 mN and the tensile strength is 876.29 N/m when the beating degree and thickness of loofah fiber is 36° SR and 0.230 mm, respectively. Scherichia coli and Staphylococcus aureus on the loofah wet nonwovens have no inhibition zones. The effect is fairly good that Bacteriostatic width is 0 and no bacterial reproduction appears.

Investigation on carding thinning of cotton-stalk bark cellulose fibers

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  28-31.  doi:10.13475/j.fzxb.20161007704

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In order to obtain cotton stalk bark cellulose fiber wit small linear density, according to the structure morphology of cotton stalk bark fiber, the mechanically thinning of cotton stalk bark cellulose fibers was carried out rsing single roller carding, single flat carding and combined roller carding-flat carding method. Experimental results show that cotton stalk bark fibers needs to be added with water and hermetically wet for 12 h before carding. For only roller carding method, the mean fiber length was 39.7 mm and the mean fiber linear density 2.42 tex after carding when the water amount ei 25% base on the fiber weight. For single flat carding method, when the water amount is 15% base on fiber weight the mean diber length is 37.7 mm and the mean diber linear density is 2.2 tex after carding. For the cotton stalk bark cellulose fibers with the water amount of 25% base on the fiber weight, when the combined carding method of two roller carding-one flat carding is used, the mean linear density and mean length of the carded fibers were 1.9 tex and 39.6 mm, respectively, and the mean fell fiber length 15.9 mm and the mean fell fiber linear density is 3 tex.

Tracking measurement of yarn hairiness skeleton and length

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  32-38.  doi:10.13475/j.fzxb.20160803707

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Aimed at the defects of yarn hairiness measurement by image process in the prior image methods, a new algorithm was proposed for analyzing hairiness and measuring hairiness length by tracking yarn hairiness skeleton. First, using 10 pixels as the step value, the dividing line of hairiness skeleton by the curves of yarn edge were plotted, and the hairiness starting points were obtained. And then, the upper 5-neighborhood points or lower 5-neighborhood points were judged in the extension direction of yarn hairiness, and the new hairiness path points were obtained. The all of path points were judged until no hairiness path points exist, all of which were recorded in sequence to generate a hairiness path. and the solutions of multi-hairiness path points and crossed hairiness were peoposed. Finally, the pixel of two hairiness path points was calculated according to the distance between two points, and the hairiness measurement length was obtained. The results of tracking measurement and fixed segment measurement of long hairiness show that the measurement length can be increased by 24.3%∽666% by the new method of yarn hairiness measurement using the hairiness tracking, and the measurement results are more accurate.

Forming technology for warp weave curved fabrics

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  39-43.  doi:10.13475/j.fzxb.20160804805

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In order to solve peoblems on the weaving of weft curved fabrics, the forming technology for weft weave curved fabrics were developed by changing the mechanical structure, adjustment the combination of fabric structures and using elastic beat-up; or by changing straight line beat-up state to produce weft curves; or by modifying partial the let-off rate to achieve weft bending, et al. A variety of devices were developed one after another to meet the requirements of different weaving machine models. For instance, for weaving machines suitable for employing large jacquards, the elastic free reed was designed; and for weaving machines suitable for employing dobby, the double-curved three-dimensional surfaced reed was designed; and for the universal model adapting to those including air-jet loom the devices to control, the warp let-off was designed to produce latitudinal curve fabrics and weft directional curve fabrics, so that the fabric is more unique and novel in style, and is more vivid and rich in appearance by the fashion design of colors and patterns.

Design of a warp knitted strain sensing fabric based on optical macro-bending sensor

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  44-49.  doi:10.13475/j.fzxb.20160904806

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In order to develop an optical macro-bending sensing fabric to detect respiration and heartbeat of human body, a way knitted sensing fabric was designed by using a combined structure in which locknit stitches were knitted with cotton yarns and abopted as a ground structure, and optical fiber with a radius of 1 000 μm was used as the inlay yarn. The relationship between the bending curvature radius of the optical fiber and the loss of its optical signal outprt was investigated by experimental method. 10 mm and 2 cycles were determined as the initial curvature radius of the initial curvature radius of the optical fiber and optical fiber and the number of sensing unit, respectively. Then, the properties of two guide bar warp knitted structures were compared and analyzed, and the modified Sharkskin structure was chosen as the ground structure of sensing fabrics. Based on  them, lapping diagram adn stitch density were designed, and the sensing fabrics were produced on a hand driven warp-knitting machine. Finally, these fabrics were tested, and the results show that the optical signal changes can effectively reflect the change of the fabric shape by means of voltage changes in the stretching peocess.

Sound insulation properties of waste polyester fabric/chlorinated polyethylene composites

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  50-54.  doi:10.13475/j.fzxb.20160506806

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In order to resolve the peoblems on the waste textile fibers recycling and the noise pollution in daily life, composite with good sound insulation property were prepared from waste polyester fabric and chlorinated polyethylene (CPE) by a hot-processing method. Firstly, it was found that the sound insulation property of the waste polyester fabric/CPE composites was the best according to the sound insulation curves of waste polyester fabrics, CPE plate and waste polyester fabric/CPE composites. Secondly, the sound insulation properties of the composites which were prepared by changing the waste polyester fabric layer number and density and pressure were tested. It was showed that the sound insulation property were improved by increasing the waste polyester fabric layer number and density and pressure. Then, the sound insulation quantity of the composite was calculated according to a theoretical model. By comparisons of theoretically calculated and actually measured value of the sound insulation quantity, it is showed that the the theoretically calculated values have good match with the actually measured values.

Stab-resistant mechanism of fabrics and influence of cutter shape on stab resistance

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  55-61.  doi:10.13475/j.fzxb.20160900407

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In order to explore the stab-resistant mechanism of high-strength fabrics, the fabric stressing changes and cutter energy transformation occured in the cutters’  stab  process are analysed from the view of mechanics，the stab experiment results of ultra-high molecule weight polyethylene stab-resistant fabric under the static and the dynamic environment verify the theoretical analysis of instantaneous impact force resulting from the cutting tool and the conversion of kinetic energy. The calculation results demonstrate that the instantancous impulse force of the cutter end to the fabric can reach 1811.85 N and the instantaneous pressure can be  7.49×108 Pa under conditions of the stab kinetic energy of 24 J and the stab angle of 0°; and the two are main factors causing the fabric damage. Some kinetic energy produced in the cutter stab process overcomes the fabric elasticity, and the other kinetic energy transforms into heat energy, which allows the fabric to be heated up to at least 100℃, but the specific conversion requires further study. Different  cutter shapes cause different damage mechanisms to fabrics, and have direct impact on the shape and the stab depth, and under the same conditions, the double-edged cutter has the largest stab depth, followed by single-edged cutters and cones.

Thermal properties of polyimide fiber fabrics for textiles

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  62-67.  doi:10.13475/j.fzxb.20160801206

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In order to study the thermal properties of polyimide fibers as textile fibers, polyimide fibers and polyimide knitted fabric were used as the research object. TG and DTA were used to analyze the thermodynamic property of polyimide fibers, and the heat resistance of the fibers were tested; at the same time, the influence of the fabric structure on the flame retardant, warmth retention properties and air permeability of polyimide fabrics was discussed. The results show that polyimide fiber have good heat resistance, began to thermally decomposition at about 570℃ and has lower strength lower strength loss at 200℃, and the strength of the fiber can still maintain at 80% of that of original fiber after treatment for 1.5 h. Polyimide fiber fabric have better flame retardantcy and the limit oxygen index greater than 45%, and the flame retardancy is enhancement with the increase of the surface density of the fabric; and the warmth retention property of the polyimide fabric are greatly influenced by fabric structure, for structure loose fabrics, the warmth retention decreased with increase of gas permeability, it is also influenced by the fabric thickness, and under certain conditions, the fabric thickness plays a leading role in the warm retention properties.

Internal damage localizationof three-dimensional six-directional braided composites based on carbon nanowire sensors

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  68-74.  doi:10.13475/j.fzxb.20160903807

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In order to strdy the structural health monitoring of three-dimensional (3-D) braided composites in real-time, a method for constructing smart 3-D braided composites was proposed. The method is based on the structure of three-dimensional six-direction braided composites.In the process, carbon nanowire sensors were embedded into the composite in the form of axial yarn and sixth direction yarn by three-dimensional four-step and six-directional braiding. The internal damage monitoring system of 3-D braided composites based on carbon nanowires was established. The main characteristics of resistance value matrix measured by  carbon nanowires were analyzed using singular value decomposition of four partitioned matrix. The exact internal damage positions of samples were calculated  using main characteristics of the matrix. Five different types damage samples were aadopted in experiments. The experimental results show that the internal damage localization of samples by the method are consistent with the actual damage. The damage location coordinate error is less than 1. This study will provide a theoretical basis for the development of the structural health monitoring of smart 3-D braided composites.

Influence of  degumming process on the silk dissolution and properties of regenerated silk fibroin fibers

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  75-80.  doi:10.13475/j.fzxb.20161001806

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In order to study the relationship between the degumming process and silk dissolution and fiber formation, the influence of the conecntration of degumming solution and degumming times on degumming rate, silk surface morphology and fibroin solubility and the structure and properties of regenerated silk fibroin fiber were investigated. The results indicat that the degumming rate incerase with the increase of the concentration of degumming solution and degumming times. When the concentration of Na2CO3 is 0.1% and degumming is performed for 3 times, fibrils obviously appear on the surface of degummed sild fiber, with the breaking strength decreasing by 27.6%. The degree of removal of sericin has an impact on the dissolution process and the structure of regrnerated sild fibroin. The dissolving time decreases with the increase of the concentration of degumming solution and degumming times. When the concentration of Na2CO3 is 0.05% adn degumming is performed for 3 times, the obatined regrnerated silk fibroin fiber bas smooth surface, compact structure and good mechanical peoperties.

Optimization on structure and property of ferric oxide cationic modified by cations

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  81-85.  doi:10.13475/j.fzxb.20161002405

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To improve the structure and properties of the cation-modified ferric oxide in air atmosphere, the preparation process of polydiallyldimethylammonium chloride (PDDA) modified ferric oxideis further optimized. Ferric oxide was prepared by chemical co-precipitation, and was modified with PDDA at different grain forming stages, and the influence of modification on the product quality was investigated. The prepared modified ferric oxide was characterized and tested by of X-ray diffraction, particle size analyzer, transmission electron microscopy and vibrating sample magnetometer. The result shows that the modification is carried out directly after the formation of crystalline iron oxide. The coating thickness is suitable and the coating ratio is 2.01%. The ferric oxide nanoparticles are uniformly dispersed in the PDDA. The magnetic properties of composite particles are strongest up to 3.47×10⁵ A/m.

Engineering plant adn process for dyeing of polyester bobbins in supercritical CO2 fluid

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  86-90.  doi:10.13475/j.fzxb.20160700406

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In order to solve the problems of large water consumption, power consumption and wastewater emissions in conventional aqueous dyeing process, anhydrous dyeing engineering production of polyester bobbins was conducted by employing a 1000 L multiple supercritical CO2 fluid dyeing system with independent intellectual property. Based on the developed multiple supercritical CO2 fluid dyeing plant, a dyeing process in supercritical fluid was introduced systematically. Furthermore,  the anhydrous dyeing process for polyester bobbins was carried out in supercritical CO2 fluid using a uniquely designed bobbin dyeing kettle. The result show that the dyed polyester bobbins with high color depth and good levelness are obtained by employing the 1000 L multiple supercritical CO2 fluid dyeing plant. In addition, washing colorfastness, the rubbing colorfastness and light colorfastness of the dyed bobbins were rated more than 4-5, 4-5 and 6, respectively.

Color development of photonic crystals on fabric surface

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  91-95.  doi:10.13475/j.fzxb.20161000505

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Polyester fabrics with different fabric structure were chosen as the base material to explore the feasibility of structural color applying to textile coloration and the influences of the fabric structure on the strutural color development of photonic crystals. Black polyester fabrics with different structure were chosen as the base material. SiO2 microspheres with high roundness, excellent monodispersity and diameter ranging from 150 nm to 300 nm, were prepared by Stöber method. The photonic crystals on polyester fabrics with ordered arrangement were fabricated by vertical deposition self-assembly of SiO2 microspheres, and exhibited brilliant structural colors .The Lambda-35 UV-VIA spectrometer were applied to confirm the color difference of structure color on polyester fabric with different fabric structure. It proved that under the same self-assembly process conditions, the reflection difference caused by different fabric surface structure influences the luster of structural color on the fabric . Compared with satin fabric, the luster of structural color on plain fabrics is more shiny.

Flame retardant finishing of silk fabrics with boron phosphate doped silica sol

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  96-101.  doi:10.13475/j.fzxb.20161005606

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In order to obtain silk fabric with good flame retardancy, silk fabric was finished with boron phosphate doped silica silica sol by pad -dry-cure process. The surface morphology, flame retardant properties and element distribution of the silk fabrics were tested and characterized by scanning electron microscopy, oxygen index, energy spectroscopy. The results show that the silk fabric finished by immersing silk fabric in the doped modified silica sol and drying 170 °C for 3 min has best flame retardancy, and the doped modified silica sol was prepared from 100 mL of silica sol, 50 mL of  deionized water, 30 g/L of boron phosphate, 50 g/L citric acid, 40 g/L of tartaric acid, 45 g/L of  sodium phosphinate by stirring at 80℃ for 3 h. The limit oxygen index of silk is 30.6% and has good washing durability.

Influence of surface modification on interfacial properties of polyester fabric/polyvinyl chloride composites

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  102-107.  doi:10.13475/j,fzxb.20160905906

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In order to improve interfacial adhesive property and prolong service life of polyester fabric/polyvinyl chloride composites, the polyester fabric were subjected to surface modification with homemade fiber surface modifier by deoiling treatment, alkali treatment and modifier coating. The polyester fabric/polyvinyl chloride composites were prepared by using the treated polyester fabrics as reinforcer and polyvinyl chloride as matrix. The surface morphology, surface energy and monlfilament strength of polyester fiers before and after modification as well as the mechanical properties interfacial peeling properties of polyester fabric/ polyvinyl chloride composites were tested by scanning electron microscope, atomic force microscope, dynamic contact angle testing and tensile testing, respectively. The  results show that the roughness of the modified polyester fibers is obviously improved, the surface energy increases by 79.77% compared with untreated polyester fibers, resulting in a 94.82% incerase in the interfacial peeling strength of polyester fabric/polyvinyl chloride composites.

Infouence of moisture content on heat stored performance of multilayer fabric assemblies for firefighters

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  108-113.  doi:10.13475/j.fzxb.20160900706

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In order to evaluate the influencet of moisture content on thermal protective performance of fabric for firefighters, burning predication was proposed according to the Henriques human body skin burn model by using the modified existing thermal protective performance tester, adopting two kinds of method of conventional thermal protective performance test, and utilizing the skin simulant sensor to replace the copper sheet sensor. The influence of the moisture content of the fabric assembly on second degree skin burn (MET) and stored energy index (SEI) were investigated. The results show that the MET obtained by these two methods reduced with the moisture content and the SEI also decreases. A negative correlation relationship exists between the moisture content and MET. Simple linear regression equations are developed between SET and moisture content.

Influence of shape memory alloy on thermal insulation performance of flame retardant fabrics in low radiation environment

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  114-119.  doi:10.13475/j.fzxb.20161006006

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To improve thermal protective performance of firefighters’ protective clothing, several shape memory alloy (SMA) springs were arranged between the moisture barrier laet and the thermal insulation inner layer to develop a smart flame resistant fabric combination with a dynamic structure. A low radiant heat was simulated by a thermal protective performance tester and the surface temperatures between layers under exposure to low radiation were recorded. The protective performance of fabric in different arrangement modes of SMA springs was evaluated by the temperature changes between layers. The results indicated that SMA springs have good dynamic heat insulating properties by means of the air layer caused by the deformation of SMA springs under radiant heat, and thus improve the protective performance of fabrics. Meanwhile, the arrangement of SMA springs has impact on the thermal protection as well. The samples with the SMA arrangements of one spring in the center and three springs on the diagonal line exhibit better thermal protection performance. The shape and size of the air gap produced by different arrangements of SMA springs show obvious difference, and thus affect the thermal insulation properties of flame retardant fabric combinations.

Study on size changes of man's lower limb body in riding motion

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  120-126.  doi:10.13475/j.fzxb.20160706607

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In order to provide reference for the delearn about Man's lower limb skin change rule during riding was analyzed. The contraction and relaxation of the mrscles of the legs caused a greater change in the surface of the skin, and six typical riding actions were selected, and the testers' right leg size data were measured by lineation-on body method to lbtain man's lower limb body surface data and the data change rule was nanlyzed. It is found that, the tensile deformation of the skin of all parts of the leg is complicated and varies considerably, with the wariation rate of -61.10% to110.82%. The skin deformation between the waist line and crotch line is significant, and the biggest one is the changes of the waist line, the hip line and the thigh contour line; in the longitudinal direction, the front crotch reduces the most, with the minimum value of -42.01%, and the decreasing trend gradually becomes smaller in the position of the outer side suture; the rest crotch increases the most with the maximum of 61.71%; and knee movement causes more complicated changes in the knee line and a greater impact on the body length.

Structure of outspread inserted pieces in Tibetan robes and gusset in pre-Qin robes

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  127-131.  doi:10.13475/j.fzxb.20160708205

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In order to establish the structure map of Tibetan costume and optimizing the whole structure system of Chinese national costumes. Using the research methods of typology and comparison, the outspread inserted pieces of an important discovery have been found in study on the Tibetan costume structure from the Museum by comparison, which is found in other ethnic groups. Similar structure appeared in the later state of the Warring States period of two thousand years ago. Structure of gusset in robe of Chu Tomb No.1 at Mashan in Jiangling is similar to the outspread inserted pieces. It is found that there are many similarities exist between the two things. Both of them are based on the functional exploration and practice under the cross flat structure. The difference is that the inserted pieces are integrally connected with the side piece instead of separate pieces, which embodies the nature respect under the motivation of thrift. It is of index significance in establishing the cross flat structure system of unified multi-culture Chinese traditional costumes.

Dynamic characteristics and response of fluid  sloshing in beaker assembly in blended fabric quantitative analysis system

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  132-138.  doi:10.13475/j.fzxb.20160904207

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In order to reduce the risk of manual operation and improve the stability of the beaker assembly in blended fabric quantitative analysis system, operating conditions were designed firstly. Then, according to theoretical analysis, dynamic characteristics of fluid sloshing in single beaker were simulated by FLUENT for each operating condition. Results indicate that no water splashed out of the glass beaker, and the beaker bottom is subjected to the pressure action in the form of sine due to fluid sloshing. Finally, static analysis and harmonic response analysis of supporting steel mesh plate were carried out by ANSYS according to the liquid sloshing result.  Results show the fluid sloshing frequency is not fit with the inherent frequency of supporting plate, and the dynamic deformation in the operation process of the beaker assembly and operationc conditions are reasonable and desirable.

Design and optimization of partial parameters of main drafting for FA322B drawing frame

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  139-143.  doi:10.13475/j.fzxb.20160605905

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For drawing and drafting fibers of different lengths on the FA322B drawing frame, partial process parameters of the drafting mechanism of the drawing frame are needed to artificial experience,but it is hard to achieve optimal drafting effect. In ordr to solve this problem, based on analyzing the operating principle of the drafting mechanism of the FA322B drawing frame, the modeling optimization was adopted to obtain the optimal adjustment position of the transverse distance between the  second upper and lower rollers, providing theoretical guide for the process adjustment in actual production. The influences of the transverse distance between the second upper and lower rollers on the drafting effect was also investigated. The results indicate that improper transverse distance between the second upper and lower rollers can carse fibers to adhere to the front upper roller, thereby greatly affecting the drafting effect. Therefore, transverse distance between the second upper and lower rollers should beadjusted carefully to ensure good drafting effect in actual production.

Inertial load change rule and speed increasing test of rapier loom

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  144-149.  doi:10.13475/j.fzxb.20160805506

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In order to increase the speed of rapier loom, the change rules and the distributions of the equivalent moment of inertia on main shaft of all components of its driving system as well as the changing rules of the inertial load on the loom were studied, and the proportion rule of the motion components of the loom to the equivalent moment of inertia on main shaft was obtained. For a WL680  type rapier loom with a reed width of 360 cm, by the structure optimization optimization, the  weight of rapier and ribbon is reduced by 28.26%, and the movement of inertia of the rapier wheel is reduced by 43.73%. A prototype was designed. The simulation results showed that the equivalent moment of inertia on main shaft of the optimized loom is reduced by 27%, and as the loom width decreased, the effect of this method reduces obviously. The physical prototype test shows that the vibration and power consumption of the optimized loom reduce obviously when running at the same speed, the highest speed of the optimized loom increases by 7% -8%. The results show that although the weights from rapier and ribbon are light and the moment of inertia of the rapier wheel is small, their influences on the equivalent moment of inertial load of main shaft are sensitive, and it is great helpful to increase the loom speed and to reduce the vibration and power consumption of the loom by reducing its weight and moment of inertia.

Internet-based computer-aided design system for weft knitted fabric

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  150-155.  doi:10.13475/.j.fzxb.20160805806

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Aiming at the defects of existing computer-aided design (CAD) systems for weft knitted fabric of can only run on a single unit or local area network, a weft knitted fabric CAD system was developed to the needs of the overall process of weft knitted products from design to manufacture by combining the network technology with database technology and adopting the technology of C #, Javascript and HTMNL5. Pattern drafted patterns and the online design of weaving graphs realized, and the  arrangement of cams were automatically calculated and grnerated. And strutured query language (SQL) database was used to efficiently store and manage wast amounts of data resources of knitted products. The browser/server mode, the Web sites and data storage services were all deployed to the server, zero client installation, and zero maintenance were achieved, users can design knitted fabrics online anywhere by accessing the Web sites by a computer or a mobile intelligent terminal. And the fabric weave design was used as an example in the practical test，the test results showed that it is convenient for operation, and the data information storage and updating is efficient and quickly, thereby meeting the needs of online design of rsers well.

Fabric curved surface seam extraction using binocular vision and stitching path planning

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  156-160.  doi:10.13475/j.fzxb.20160801505

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Aiming at the seam automatic extraction and the stitching path planning of curve surface fabrics, a seam automatic recognition method based on binocular vision was proposed. Combined the spatial position conversion between three dimensional points cloud and the two dimensional image of a stitched prefabricated part, the map of the seam in two dimensional image of the prefabricated paart in the three dimensional points cloud was acquired. Furthermore, Freenet-Serret vectors in all positions of the stitching path were calculated by a path designing method based on Frenet-Serret vectors, the posture of a robot terminal was calculated, and the stitching path of the robot was simulated using MatLab. The experimental results show that the method can position the spatial positions of a seam accurately and quickly and solve the problems in the automatic stitching process on difficut stitching path search and low precision, and can also plan a stitching path of the robot quickly.

Structure and development of polytetrafluoroethylene anti-corrosion filtration materials

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  161-171.  doi:10.13475/j.fzxb.20160603911

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In order to study the market industrial demand for polytetrafluoroethylene (PTFE) filter material, the main aspects (application in the field of filtration of industrial dust, structure and component of filters, and development in the purifying industry dust field) of polytetrafluoroethylene anti-corrosion filtration materials are reviewed. More importantly, the development of PTFE filters applied in the four main industrial fields (namely, waste incineration, coal-fired power plants, steel and cement) in the time period between 2016 and 2020 is analyzed. Additionally, on the basis of the structural characteristics of anti-corrosion filters, demands of PTFE split-film fiber, bearing cloth, sewing and micro-pore membrane are also predicted reasonably. The analysis indicates that the cumulative demands of PTFE filter materials of the purification system in the four main industrial fields will be 880, 18 855.5, 5 660 and 7 905 tons, respectively, implying that the increase ratio is over 10%. Analysis of demands of PTFE filter materials in next five years could provide the industry-purification system with a significant reference.

Research progress on deep treatment and recycling of  dye wastewater

JOURNAL OF TEXTILE RESEARCH. 2017, 38(08):  172-180.  doi:10.13475/j.fzxb.20160603209

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Dye wastewater has some problems such as high alkalinity, complex composition and poor diodegradability. In order to optimize the advanced treatment process and improve the treatment efficiency of dye wastewater, the characteristics of dye wastewater were analyzed and the primary processes for the various stages (preteratment, biochemical treatment and deep treatment) were reviewed in advanced treatment processes. The selective difference between conventional advanced treatment process and membrane separation process for removal impurities of dye wastewater were compared. The reaults showed that the pretreatment and biochemical treatment of dye wastewater is mature at present, and adsorption and advanced oxidation processes could be used to achieve the deep treatment of dye wastewater, but its recycling and desalination has become an urgent problem. Though the membrane technology could efficiently desalinate, the single membrane techonlogy has the problems of pollution and lack of stability. Overall, the deep teratment of dye wastewater should focuse on the optimization combination of pretreatment, biochemical treatment and membrane technology.