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1.
Influences of processing parameters on tensile property, stability and bulk of core-and-effect air textured yarns of diacetate
and polyester filaments are mainly examined in this paper. When the air pressure is raised, the tenacity and breaking elongation
of textured yarns are reduced, Instability I and II tend to decrease at first and then increase, the core bulk declines markedly
at first and then changes slowly, whereas the overall bulk changes little at first and then goes up greatly. With increase
in texturing speed, the yarn tenacity and breaking elongation both drop initially then begin to increase, the core bulk and
overall bulk are almost linearly increased, while the yarn instability changes with an unclear trend. When the winding underfeed
ratio is increased, the yarn tenacity, breaking elongation and core bulk are reduced, but the yarn stability is slightly improved.
The wetting of the core component produces higher tenacity, breaking elongation, instability and bulk, compared with that
of the effect component or that of both, but the difference is insignificant. 相似文献
2.
Delamination is the most common failure mode in laminated composites, due to the reduced strength in the through-the-thickness direction. This paper describes the development of core-and-effect textured glass yarns for improving the bonding strength of laminated glass woven fabric composites. Air-jet texturing introduces bulk and loops in the yarn which provides more contact surface between the fibers and the resin. However, the yarn tenacity decreases after texturing because of the reduced alignment of the filaments. The effects of texturing air pressure, yarn overfeed ratio, yarn linear density and core-sheath ratio were studied in this paper. The tenacity of glass yarns decreased significantly after the texturing process. The reduction was smaller for yarns with a higher core linear density. The effects of texturing air pressure on the tenacity were found to be insignificant. 相似文献
3.
Raju Seenivasan Rengasamy Raghavendran Guruprasad Patnaik Asis 《Fibers and Polymers》2005,6(2):146-150
In this paper, friction of air-jet textured yarns is investigated. Using a friction measuring apparatus fabricated in-house,
dynamic friction forces of the yarns under yarn-to-metal (YM) and yarn-to-yarn (YY) rubbing modes are measured. The influence
of processing variables of air-jet texturing viz., overfeed, air pressure, dry/wet texturing and normal/core-and-effect texturing
on dynamic friction is analysed. The results indicate that friction force increases with increasing rubbing speeds and yarn
input tension. YM dynamic friction decreases initially and then starts to increase at higher overfeeds. YY dynamic friction
increases with increasing overfeed. YM dynamic friction decreases with an increase in air pressure while an opposite trend
is observed for YY friction. Wet textured yarns have higher friction than dry textured yarns. Core wetted core-and-effect
textured yarns have higher friction than normal textured yarns. 相似文献
4.
Blending of nylon filament with viscose can overcome the drawbacks of these yarns. Thermoplastic and thermoset filament yarns
can be blended in air-jet texturising method. The characteristics of nylon/viscose blended filament yarns are required to
be understood in order to convert them in to useful products. Therefore, nylon/viscose blended yarns in different proportions
were produced using nylon 6 and viscose filament yarns in air jet texturising machine. The textured yarns were also produced
in dry and pre-wet conditions to understand the effect of water on textured yarn characteristics. It was found that the loops
frequency, bulkiness of nylon/viscose blended textured yarns increase with increase in viscose proportion. The Loops stability,
tenacity and breaking elongation decrease with increase in viscose proportion. Pre-wet textured yarn show higher loops, bulkiness,
and good loop stability than their corresponding dry textured yarns. 相似文献
5.
Delamination is the most common failure mode in laminated composites due to the reduced strength in the through-the-thickness direction. Air-jet texturing was used to provide more surface contact between the fibres and the resin by producing bulk and loops in the yarn. The development and characterization of core-and-effect textured glass yarns and the effect of texturing on the mechanical properties of laminated composites were presented in the previous papers. This paper describes the effect of texturing on the inter-laminar fracture toughness (Mode I) of glass laminated composites. The composites of twill weave fabrics were developed from both the textured and non-textured yarn and fracture toughness is tested in warp and weft directions. Significant improvement was observed in the Mode I fracture toughness of the composites after texturing. The bulkier, loopy structure of the textured yarn provided more surface contact between the fibre and the resin and significantly improved the bonding strength. 相似文献
6.
This study examined the effects of the total porosity, pore size, and cover factor on the moisture and thermal permeability of woven fabrics made from DTY (draw textured yarns) and ATY (air jet textured yarns) composite yarns with hollow PET (polyethylene terephthalate) yarns. The wicking of the hollow composite yarn fabrics was found to be superior to that of the high twisted yarn fabrics, which may be due to the high porosity in the hollow composites yarns, but this was not related to the cover factor. The drying characteristics of the hollow composite yarn fabric with high porosity were inferior compared to the high twisted yarn fabrics due to the large amounts of liquid water in the large pores, which resulted in a longer drying time of the fabric. The thermal conductivity of the hollow composite yarn fabrics decreased with increasing measured pore diameter due to the bulky yarn structure. The effects of the hollowness of the yarn on the thermal conductivity were more dominant than those of the yarn structural parameters. The air permeability increased with increasing measured pore diameter but the effects of the cover factor on the air permeability were not observed in the hollow composite yarn fabrics. The effects of porosity on the moisture and thermal permeability of the woven fabrics made from the hollow composite filaments were found to be critical, i.e., wicking and air permeability increase with increasing porosity. In addition, the drying rate increased with increasing porosity and the thermal conductivity decreased with increasing pore diameter, but were independent of the cover factor. 相似文献
7.
The tensile properties of air-entangled textured polyester single and multiple yarn ends before and after weaving were analyzed.
The effects of weaving process considering fabric unit cell interlacement and number of yarn ends were evaluated by regression
model. For this purpose, plain, ribs and satin woven fabrics were produced. The yarns were raveled from fabrics, and the tensile
tests were applied to these yarns. The developed regression model showed that the number of interlacement and crimp ratio
on the warp and weft yarns influence their tensile strength. Tensile strength of raveled yarns decreased compared to that
of the bobbin yarn due to the effect of weaving process. This property degradation on the ravel yarns considered process degradation.
Generally, when the number of warp and weft yarn ends increases, the warp and weft yarn tensile strengths for each fabric
type decrease, whereas the warp and weft yarn tensile elongations slightly increase. The results from regression model were
compared with the measured values. This study confirmed that the method in the study can be a viable and reliable tool. The
research finding could be useful those who work on preform fabrication. 相似文献
8.
This paper is aiming to develop high shrinkable differential shrinkage and mixed fibre nylon composite yarns by applying the
high shrinkable polyester manufacturing technology. The wet and dry thermal shrinkages and mechanical properties of developed
nylon composite yarns are measured and discussed with processing factors in the spinning and texturing processes. And the
effects of the processing factors on the physical properties of high shrinkable nylon composite yarns are investigated. For
this purpose, twenty seven nylon 30d/12f SDY were prepared with variation of spinning temperature, 2nd godet roller temperature
and draw ratio on the spinning machine. The optimum spinning condition which showed maximum wet thermal shrinkage and stress
was determined and high shrinkable nylon 30d/12f SDY spun under this optimum condition used as a core and three kinds of regular
nylon filaments used as sheath were processed on the texturing machine with variation of 1st and 2nd heater temperatures.
The optimum texturing process condition was decided through analysis of dry thermal shrinkage of these core and sheath nylon
filaments. Finally, high shrinkable differential shrinkage and mixed fibre nylon composite yarns were made under the optimum
texturing condition on the texturing machine, its wet thermal shrinkage was 13.8 %, which was much more higher than that of
regular nylon composite yarns. The differential shrinkage effect of the developed nylon composite yarns was found in the yarn
surface and cross section profiles by microscope and SEM. 相似文献
9.
PET yarns textured at different texturing conditions were treated with superheated steam or dry heat at different temperatures
for different times. The effects of the treatment conditions on the thermomechanical and structural changes of the yarn were
examined by shrinkage, X-ray diffraction and birefringence measurements. With increase in superheated steam temperature, the
crystalline orientation factor and birefringence decreased, whereas crystal size increased. Dry heat treatment had a smaller
effect on shrinkage and structural properties in comparison with superheated steam treatment. The additional shrinkage after
texturing process was investigated. The effect of heat-setting in both media was more significant at 200 °C. The time dependence
of the properties was not linear. 相似文献
10.
A. M. Manich J. Maillo D. Cayuela J. Gacén M. D. de Castellar M. Ussman 《Fibers and Polymers》2007,8(5):512-519
Polyamide 66 multifilament yarns are textured in order to be endowed the properties of natural staple fibre yarns for textile
applications. Texturing changes crystallinity, orientation and promotes the formation of stable secondary links between the
macromolecular chains. Two polyamide yarns with the same linear density but composed of filaments of different fineness were
textured by the air-jet and the false-twist procedures. The microstructural changes induced by texturing modify the relaxation
behaviour of yarns. By the application of the Nutting’s power law which relates stress, strain and time, the influence of
texturing and filament fineness on the relaxation behaviour of the yarns stretched form 15% to 25% was studied. Relationships
between Nutting’s model parameters and crystallinity, orientation and stability of secondary crosslinks formed during texturing
were also studied. 相似文献
11.
Polylactic acid (PLA) is a biodegradable and compostable polymer obtained from annually renewable resources and is acknowledged to be sustainable and non-polluting polymer with substantial commercial prospective as a textile fiber however, there is lack of literature on apparel applications of this polymer. Therefore in this study it was aimed to develop biobased compostable gloves from PLA draw textured melt spun yarns and to examine the effect of yarn linear density, fabric structure and stitch density on thermo-physiological comfort and moisture management properties of PLA based gloves. 100 % PLA based multifilament yarns of two different linear densities were melt spun and later draw textured on false twist texturing machine to be used for gloves knitting. Single jersey and rib structures were produced with two different stitch densities to investigate their effect on thermal conductivity, thermal resistance, relative water vapour permeability, air permeability and moisture management properties of the gloves. Minitab statistical software was employed to analyze the results of test samples. The coefficients of determinations (R2 values) presented good estimation capability of the established regression models. The outcomes of this research may be useful in determining suitable manufacturing requirements of PLA based gloves to accomplish precise thermo-physiological and moisture management properties. 相似文献
12.
Core spun yarns are applied for various purposes that especially require the multi-functional performance. This research reports
on the core spinning effect on the yarn strength. We prepared various core yarns by combining different kinds of high tenacity
filaments in core with cotton staples in sheath with various twist levels in the ring spin system. And the tensile strength
was tested to investigate the contribution of the core-sheath structure to the core yarn strength. The influence of the twist
level was also checked up on the relationship between the core-sheath structure and the yarn strength. Results turned out
that the core-sheath weight ratio had influence on the tensile properties of the ring core-spun yarns in different ways according
to the core filaments used for the yarn. Increasing the twists yielded a monotone decreasing strength for the aramid and the
basalt core yarns, while the PET core yarns showed almost unchanged strength, which could be ascribed to the extensional property
of the filaments. 相似文献
13.
In the present study, effect of OPP (oxidized PP) fraction on the mechanical and structural properties of produced fibers
is investigated. Polypropylene powder without antioxidant materials was oxidized at the suitable thermal condition. The various
fractions of OPP were blended with PP in the chips shape, and employed as starting material in a melt spinning machine for
production of filament yarn. Then as-spun filaments were drawn and finally textured. Structural properties including density,
birefringence and FTIR and physical properties consisting of shrinkage, tensile properties and crimp properties were measured.
Results show that blending of OPP with virgin PP reduces tacticity and crystallinity, but it hasn’t any effect on orientation.
Physical properties of drawn yarns and textured yarns were reduced with increasing of OPP fraction. Moreover, increasing of
OPP fraction in blend, reduce crimp properties of textured yarn. 相似文献
14.
Twisted Copper Filaments (TCF) have been made by a yarn covering process in order to transmit signals and powers for electronic textiles. The 560 den. poly urethane filaments were covered in S-twist direction by urethane-coated copper wires. Two TCF twisted in Z direction were further covered in S direction by PET filaments to make final hybrid structure yarns (HSY). The HSY prepared was proportionally increased in apparent resistance along with measurement length, and showed resistivity of 0.00414 Ω·m. The number of ply was critical in terms of resistance variation, showing a linear increase of resistance with ply number. The twist factor, however, was not so significant without a slight decrease for severe twist level. Resonance Frequency, S11 (reflection), S21 (transmission) were measured and compared in order to examine the feasibility of applying to electrical signal transmission for wearable textiles. As expected, amplitude of resonance frequency was significantly decreased mainly due to increase of capacitance caused by length increase. It has been shown that S11 and S21 has been increased and decreased, respectively due to increase of transmission distance. While resonance frequency has been kept along with the ply number, S11 and S21 were decreased and increased, respectively according to decrease of copper fiber. Final filaments were found to be changed in resonance frequency mainly due to the change of di-electricity and thus capacitance caused by PET covered on it. It have been concluded that while resonance frequency was primarily determined by filament length and dielectric constant of covering yarns, S11 and S21 were mainly determined by measurement length and ply number. 相似文献
15.
Composite materials have a wide range of applications in structural components because of their high strength-to-weight and stiffness-to-weight ratios. However, the most crucial and common life-restricting crack growth mode in laminated composites i.e. delamination is of great concern. Air jet texturing was selected to provide a small amount of bulk to the glass yarn. The purpose was to provide more surface contact between the fibres and resin and also to increase the adhesion between the neighbouring layers. These were expected to enhance the resistance to delamination in the woven glass composites. The development and characterisation of core-and-effect textured glass yarns was presented in the previous paper. This paper describes the comparison of the mechanical properties of composites produced from air-textured glass yarns and the composites made from locally manufactured carbon fabrics. The tensile, flexure and inter-laminar shear strength (ILSS) were compared and it was observed that although glass fibres are inferior to carbon fibres in terms of mechanical properties however, the flexure strength and ILSS of glass based composites increases after texturing and were found closer to the properties of carbon based composites. 相似文献
16.
In this paper, the capillary rise method was applied to evaluate the wicking property of polyester filament yarns. Effects
of twist, monofil cross sectional shape and texturing on the wicking height were discussed in details. The results indicated
that with the increase of twist level, the wicking height ascends until reaching the maximum height, and then descends. It
is also observed that under the same twist level, the wicking height of the five-leaf low-stretch yarn is the largest among
all those three kinds of yarns, and then is that of the conventional low-stretch yarn. The wicking height of the parallel-drawn
yarn is the smallest. 相似文献
17.
The effect of blend percentage on comfort and handle related properties of fabrics made from polyester/viscose blended air-jet
textured yarn weft were studied and the results were compared with fabrics made from polyester/viscose ring-spun yarn wefts
of similar linear densities. It is observed that with increase in polyester content in the blend, the air permeability and
water vapour permeability reduces whereas thermal resistance, transverse wicking and shear rigidity increases both in ring-spun
yarn and textured yarn fabrics and bending rigidity increases in textured yarn fabrics. Textured yarn fabrics exhibit lower
air permeability and extensibility, higher thermal resistance, relative water vapour permeability, transverse wicking values
and bending rigidity as compared to the ring-spun yarn fabrics. 相似文献
18.
Polyvinyl chloride (PVC) fibers were melt-spun to prepare mono and multifilament yarns. To find optimum spinning and drawing
conditions, various parameters such as spinning temperature, spinneret diameter, drawing temperature, and drawing ratio were
examined. From the observation of the spinnability under various conditions, we found that the optimum conditions were as
following: the extrusion temperature and die temperature were 175–180°C and 185–190°C, and the drawing temperature and drawing
ratio were 85–95°C and 3.4, respectively. Under these conditions, the spinneret diameter could be reduced to the minimum value,
0.5 mm. Spun PVC filament yarns were subjected to the different yarn texturing process of stuffing box and pin false-twist
method. The PVC yarn fabric was prepared by the knitting of textured yarns. Finally, the anion-emission and antibiotic properties
of the knitted PVC fabrics were precisely evaluated. 相似文献
19.
In this research, possibility of producing and processing antibacterial organic/inorganic nanocomposite polypropylene filament
yarns for permanent antimicrobial efficiency has been investigated. First PP powder and inorganic nanocomposite filler were
mixed in a twin screw extruder and modified masterbatch was produced. Continuous filament yarn was made by a pilot plant melt
spinning machine from the blend of PP granule and various blending contents of the prepared masterbatch. Pure PP and all other
combined samples showed acceptable spinnability at the spinning temperature of 240 °C and take-up speed of 2000 m/min. After
producing as-spun filament yarns, samples were drawn, textured and finally weft knitted. Physical and structural properties
of as-spun and drawn yarns with constant and variable draw ratios were investigated and also tensile and crimp properties
of textured yarns were evaluated. Moreover, the DSC, SEM, FTIR techniques have been used for characterization of samples.
Finally antibacterial efficiency of knitted samples was evaluated. The experimental results indicated that the maximum crystallinity
reduction of modified drawn yarns has reached to 5 %. The observed improvement in the tensile properties of modified as-spun
yarns compared to the pure PP was significant. Drawing process improved generally the tensile properties of as-spun yarns.
Tensile properties of modified textured and drawn yarns were higher than the pure PP. An optimum of antibacterial activity
has been observed in the sample containing 0.75 wt% of nano-filler. It is interesting that the optimum of tensile properties
has been also obtained for the sample with maximum bioactivity. 相似文献
20.
The effect of strand spacing and twist multiplier on strength of Siro-spun yarns with reference to the yarn structural parameters
was investigated. Of the various structural parameters for staple yarns, fiber migration has a crucial influence on the yarn
strength, which in turn to a considerable extent is influenced by the strand spacing and twist multiplier. Achieving the objectives
of this research, the yarns were produced from lyocell fibers at five strand spacings and four different twist multipliers.
Tracer fiber technique combined with image analysis were utilized to study the yarn migration parameters. Afterwards, the
yarns were subjected to uniaxial loading by a CRE tensile tester. The measured results are presented in forms of diagrams
and tables. The findings reveal that, as strand spacing is increased, yarn tenacity increases up to strand spacing of 8 mm
beyond which it reduces. Analysis of the results indicates that the higher tenacity values at the strand spacing of 8 mm can
be attributed to the higher mean fiber position, higher migration factor, higher proportion of broken fibers and lower hairiness. 相似文献