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1.
This study reports on the analysis of tenacity and breaking elongation of ring-, rotor- and air-jet-polyester/viscose spun
yarns measured using static- and dynamic tensile testers. The weavability, a measure of performance of these yarns in post
spinning operations is quantified. The yarn diameters and helix angles of fibres in these yarns are measured in order to analyze
the effect of types of spun yarn and blend proportion on yarn elongations. The dynamic tenacity is highly correlated with
the weavability than the average static tenacity measured at 500 mm gauge length. The minimum static tenacity obtained from
100 tests has high correlation with the dynamic tenacity. The present study indicates that it is appropriate to evaluate the
performance of spun yarns in winding, warping and weaving based on the dynamic yarn tenacity measured while running a 200
m length of yarn in a constant tension transport tester or the minimum static yarn tenacity obtained using any conventional
constant rate extension (CRE) tensile testers corresponding to a total test length of 50 m. 相似文献
2.
Theoretical weavability limit relationships of fabrics from regular warp yarns and fancy filling yarns with thickness variation
in shuttleless weaving are reviewed. The relationships correlate maximum warp and filling cover factors, warp and filling
yarn characteristics, the distribution of thick and thin places of filling yarn over the fabric surface, and the warp and
filling weave factor. The research considers single filling feeder and multiple feeders cases. Additionally, comparisons between
the weavability limit of regular yarns and fancy yarns in shuttle and shuttleless weaving are given. 相似文献
3.
Structural analysis of finer cotton yarns produced by conventional and modified ring spinning system
Yarn structure plays an important role in determining the properties of spun yarns. Recently, a modified spinning technique has been developed for producing a low torque and soft handle singles yarn by modifying the fiber arrangement in a yarn. Comparative studies revealed that the finer modified yarns possess significantly higher strength and lower hairiness over the conventional yarns of the same twist level, implying a different structure of finer modified yarn. Thus this paper aims to quantitatively study the structures of the finer conventional and modified cotton yarn (80 Ne) produced at the same twist level. Various measuring techniques, namely the Scanning Electron Microscope (SEM), cross section technique and tracer fiber technique, are adopted to analyze their structural characteristics, including fiber configuration, fiber spatial orientation angle, fiber packing density, yarn surface appearance, and fiber migration behavior. Results showed that finer modified yarns exhibit a smoother surface and much more compact structure with less hairiness. The fibers in the finer modified yarn have a complicated fiber path with relatively lower fiber radial position, larger migration frequency and magnitudes. In addition, it was noted that 73% of fibers in the finer conventional yarn follow concentric conical helix, which is contrary to those in the coarser conventional yarn. The analyses conducted in this paper provide deep insights into the mechanism of modified spinning technique and evidential explanations on the difference of properties between the finer conventional and modified yarns. 相似文献
4.
Study on the characteristics of blended ring and rotor spun yarns is a topic of major interest to the researchers. The overall properties of these blended yarns are affected by the relative proportion, properties of the components and their interactions. The main focus of this work is on comparing and analyzing effects of blend ratio on tensile properties of the yarns produced in different spinning systems using concept of hybrid effects that has not received enough attention from researchers. Various blends of cotton-polyester ring and rotor spun yarns were prepared. Tensile properties of the samples were examined as well. Interactions between cotton and polyester fibers was evaluated through predicting strength and elongation at break of the yarns using simple rule of mixtures (ROM) and hybrid model. Experimental results showed that, the effect of different blend ratios on tensile properties of the samples is different. In comparison with 100 % cotton yarn, promotion in braking strength of the ring and rotor spun samples occurred after increasing fraction of the polyester fiber to 50 and 66.5 % respectively. The prominent finding of the present work is that the trend of change in tensile properties of different yarns versus blend ratio is predictable via hybrid model and migration behavior of the constituent fibers. Coefficients representing the intensity of the interaction and migration index of the fibers were calculated and all results were discussed based on these calculated factors. 相似文献
5.
In this study, an analysis on the breaking elongation mechanism of the polyester/viscose blended open-end rotor spun yarns
has been carried out. In addition, a back propagation multi layer perceptron (MLP) network and a mixture process crossed regression
model with two mixture components (polyester and viscose blend ratios) and two process variables (yarn count and rotor speed)
are developed to predict the breaking elongation of polyester/viscose blended open-end rotor spun yarns. Seven different blend
ratios of polyester/viscose slivers are produced and these slivers are manufactured with four different rotor speed and four
different yarn counts in rotor spinning machine. In conclusion, ANN and statistical model both have given satisfactory predictions;
however, the predictions of ANN gave relatively more reliable results than those of statistical models. Since the prediction
capacity of statistical models is also obtained as satisfactory, it can also be used for breaking elongation (%) prediction
of yarns because of its simplicity and non-complex structure. In addition, it is also found in this study that yarn count,
rotor speed and breaking elongation of polyester-viscose fibers and the blend ratios of these fibers in the yarn have major
effects on yarn breaking elongation. 相似文献
6.
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
7.
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
8.
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
9.
In this work, the effect of optimum drafting condition on the drafting behavior and yarn quality of the bamboo charcoal-modified
fiber blended spun yarns were studied. We measured the drafting force and drafting force variance, CV% of the bamboo charcoal-modified
Polyester/Cotton (BCP/C) blended roving and bamboo charcoal-modified Rayon/Cotton (BCR/C) blended roving to examine the influence
of the roller gauge and drafting ratio on drafting behavior and yarn quality. We understand that the drafting force of the
bamboo charcoal-modified fiber blended roving follow the same trend as that for the regular P/C and R/C blend roving. However,
the drafting force presents some difference in characteristics between these bamboo charcoal-modified fiber blended rovings.
To correlate the drafting force variation, CV% and the bamboo charcoal-modified fiber blended spun yarn properties, we evaluated
the yarn quality and investigate the yarn quality index in conjunction with the break drafting ratio. Therefore, in this work,
we can obtain the best optimum drafting conditions for bamboo charcoal-modified fiber blended spun yarns; for the 19.7 tex
of BCP70/C30 blend spun yarn was under the roller gauge of 54 mm at the draft ratio of 1.3, whereas, for the 19.7 tex of BCR40/C60
blend spun yarn was under the roller gauge of 54 mm at the draft ratio of 1.2. 相似文献
10.
A modified ring spinning technique has been recently developed by incorporating false twisting devices into the conventional ring frame. Its application on the coarser yarn counts (7–32 Ne) showed notable advantages in modified yarn and fabric performance. More recently, it was noted that this technique can also be applied for producing finer cotton yarns. Thus this paper aims to carry out a systematic study of the physical properties of the finer modified yarns (80 Ne) and woven fabrics with respect to the conventional ones. Physical properties of conventional and modified single yarns were evaluated and compared. These two types of single yarn were used for the production of woven fabrics. Moreover, the above two types of single yarn were also plied and used for the production of woven fabrics under a commercial condition. All woven fabrics were assessed in terms of fabric tensile strength, tearing strength, abrasion resistance, fabric weight, and air-permeability as well as other fabric performance measured by the Kawabata Evaluation System (KES). Experimental results showed that finer modified yarns and fabrics exhibit higher strength, lower hairiness, and improved abrasion resistance, slightly better compression property, and smoother surface with relatively larger thickness. 相似文献
11.
Coconut fibres were subjected to chemical treatment to obtain softer and finer fibres, suitable to blend with other finer fibre like jute. The chemical softening recipe was optimized using Box-Behnken design of experiments as 40 % Na2S, 10 % NaOH and 6 % Na2CO3, which notably reduced the fineness (33 %) and flexural rigidity (74 %) and improved tensile property of coconut fibre. Effect of softening of coconut fibre on its process performance was studied in high speed mechanized spinning system at different blend ratios with jute. Blending with jute assists in spinning of coconut fibre to produce yarn of 520 tex at production rate of 5-6 kg/h, as compared to 15 kg/day for hand spun 5300 tex raw coconut fibre yarn in manual system. Analysis of blended yarn structure in terms of packing density, radial distribution of fiber components (SEM) and mass irregularity were investigated. SEM shows yarns made from softened coconut fibre -jute blends are more compact than raw coconut fibre -jute blend yarns. Coconut fibres were preferentially migrated to core of the yarn. Major yarn properties viz., tensile strength, and flexural rigidity of raw and chemically softened blended yarns were compared against their finest possible 100 % coconut fibre yarn properties. Yarn made up to 50:50 chemically softened coconut fibre-jute blend showed much better spinning performance, and having superior property in terms of reduced diameter, higher compactness, strength, initial modulus and less flexural rigidity than 100 % raw, 100 % chemically softened coconut fibre rope, and raw coconut fibre-jute blend yarns. 相似文献
12.
Spandex fibers have superior stretch and elastic recovery ability. Composite yarns containing spandex are frequently used
to manufacture elastic textile products and accessories. We have developed a composite yarn spinning system that produces
different kinds of composite yarns containing spandex on a modified open-end rotor spinning frame. By changing the twisting
parameter of composite yarns, we studied the structure and properties of rotor-spun composite yarns with spandex. The results
indicate that the twisting parameter has great influence on the structure and properties of rotor-spun composite yarns with
spandex. The linear density of spandex filament has influence on the properties of composite yarns too. In comparison with
normal rotor-spun yarn, the appearance of composite yarns is clearer, the structure is much tighter, and the properties are
improved. 相似文献
13.
This study was aimed at developing statistical models for the prediction of tensile strength of warp and weft yarns required
for attaining a pre-defined strength of PET/Cotton blended woven fabrics. The models were developed based on the empirical
data obtained from carefully developed 234 fabric samples with different constructions using 15, 20, and 25 tex yarns in warp
and weft directions. The prediction ability and accuracy of the developed models were assessed by correlation analyses of
the predicted and actual warp and weft yarn strength values of another set of 36 fabric samples. The analyses showed a very
strong ability and accuracy of the developed statistical prediction models. 相似文献
14.
Xueqin Kuang Guangsong Yan Zhan Jiang Jianping Yang Chongwen Yu 《Fibers and Polymers》2013,14(11):1943-1946
With the development of spinning process, it was found that Martindale’s theory on yarn limit unevenness in staple fiber yarns has no longer been valid in the case of high yarn count. Martindale’s theory was based on the assumption that fibers had the identical length. Taking fiber length distribution into consideration, this paper has developed a new model on fiber random arrangement of ideal sliver. By applying mathematical probability method to analyze this model, a new mathematical expression of yarn limit unevenness has been obtained. Compared with the values from tested and calculated by Martindale’s theory, the value of new yarn limit unevenness is reasonable to reintroduce the index of irregularity in the case of high yarn count. 相似文献
15.
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
16.
N. Ezaz Shahabi F. Mousazadegan S. M. Hosseini Varkiyani S. Saharkhiz 《Fibers and Polymers》2014,15(6):1211-1220
Inside a woven fabric structure, warp and weft yarns acquire crimp as a result of yarns interlacing according to the weave pattern. Since warp and weft yarns are oriented in two perpendicular directions, applying tensile load in one direction causes extension in the load side and fabric contraction in the opposite direction. This process was investigated in this study by using an image processing procedure and it was found that fabric’s extension is in coincidence with yarn’s de-crimping process in the same direction. After the de-crimping stage, yarns in the load direction will be extended and at the same time crimp in the other direction will be increased, until jamming phenomenon happens in the fabric structure. The crimp interchange between warp and weft yarns follows a three-order polynomial function with a turning point in which the yarns in the load direction have no crimp. 相似文献
17.
In this study, an artificial neural network (ANN) and a statistical model are developed to predict the unevenness of polyester/viscose
blended open-end rotor spun yarns. Seven different blend ratios of polyester/viscose slivers are produced and these slivers
are manufactured with four different rotor speed and four different yarn counts in rotor spinning machine. A back propagation
multi layer perceptron (MLP) network and a mixture process crossed regression model (simplex lattice design) with two mixture
components (polyester and viscose blend ratios) and two process variables (yarn count and rotor speed) are developed to predict
the unevenness of polyester/viscose blended open-end rotor spun yarns. Both ANN and simplex lattice design have given satisfactory
predictions, however, the predictions of statistical models gave more reliable results than ANN. 相似文献
18.
The effect of spinning parameters on core-spun yarns properties manufactured using three-strand modified method (TSMM) was analyzed. Of the various spinning parameters, strand spacing, yarn linear density and yarn twist have a crucial effect on core-spun yarn properties. To achieve the objectives of this research, general physical properties of core-spun yarns together with existing standards were thoroughly studied. First of all, the strand spacing and yarn linear density were optimized. Afterwards, the effects of variation of yarn twist and sheath roving linear density on core-spun yarns properties were investigated. Finally, the physical and mechanical properties of TSMM yarns were compared with those of siro and conventional ring core-spun yarns counterparts. It was found that, the best strand spacing and yarn linear density to produce core-spun yarns are 8 mm and 45 tex, respectively. Results showed that, tenacity of TSMM yarns increases up to a certain twist level beyond which it reduces. The result confirmed that 45 tex yarns produced by three rovings of the same count are superior with regards to tenacity and hairiness. The optimized yarns produced by three-strand modified method enjoy superior physical and mechanical properties in comparison to the ring and siro core-spun yarns. 相似文献
19.
The moisture transport expressed with wicking is one of the most important aspects in clothing science and strongly effects on the quality of clothes. Wicking is a spontaneous transport of liquid driven into a porous system by capillary forces. Furthermore, the packing density has a direct relation with the yarn structure. At the present work, the effects of yarn count and twist factor on the wicking height and packing density of lyocell ring-spun yarns was investigated. Achieving the objectives of this research, an image processing method was developed to determine the packing density of samples. Experimental results were also used to develop a regression model to predict the wicking height based on the packing density, yarn count, twist factor and rising time. The results demonstrated that the correlation coefficient between the predicted and measured wicking height was 0.98 indicating the capability of the presented model to predict the wicking height of lyocell ring-spun yarns. 相似文献
20.
In this study, spinning with a contact surface was introduced as a simple and energy-saving method to reduce spun yarn hairiness. Theoretical analysis indicated that yarn hairiness could be reduced via a sufficient long contact surface applied in other part of yarn formation zone in addition to spinning triangle. Then, a simple contact apparatus was installed on ring frame to validate the theoretical analysis. Results proved that yarn hairiness was reduced via a contact surface in the yarn formation zone. However, unevenness was deteriorated for most yarns spun with contact apparatus during the spinning, which might be due to fiber mass concentration. Most of yarns spun with contact apparatus had a lower strength than the conventional yarns. This might be because evenness deterioration to decrease yarn strength overpowered hairiness reduction to increase yarn strength for most yarns spun with a contact surface. 相似文献