The Experts below are selected from a list of 252 Experts worldwide ranked by ideXlab platform
C H Au - One of the best experts on this subject based on the ideXlab platform.
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effect of biopolishing and uv absorber treatment on the uv protection properties of cotton knitted fabrics
Carbohydrate Polymers, 2014Co-Authors: C H AuAbstract:Abstract Cotton knitted fabrics were manufactured with gauge number 20 G by circular knitting machine with conventional Ring Spun Yarn and torque-free Ring Spun Yarn. Torque-free Ring spinning is a new spinning technology that produces Yarns with low twist and balanced torque. This study examined whether the impact of biopolishing and UV absorber treatment on UV protection properties on cotton knitted fabric made of torque-free Ring Spun Yarn is different. Biopolishing agent and UV absorber were used to treat the cotton knitted fabrics after scouRing and bleaching. The UV protection properties were measured in terms of UV protection factor (UPF) and UV ray transmittance. Experimental results revealed that knitted fabric made from torque-free Ring Spun has better UPF than knitted fabric made from conventional Ring Spun Yarn in untreated and biopolished states. However, knitted fabric made from conventional Ring Spun Yarn has better UPF than knitted fabric made from torque-free Ring Spun after UV absorber treatment and combined UV absorber and biopolishing treatment.
W Y Wong - One of the best experts on this subject based on the ideXlab platform.
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comparative study of cellulase treatment on low stress mechanical properties of cotton denim fabric made by torque free Ring Spun Yarn
Fibers and Polymers, 2013Co-Authors: Ruihua Yang, W Y WongAbstract:Cellulase is useful for bio-polishing cotton fabrics which enhances their aesthetic performance instead of stonewashing process. Torque-free Ring Spun process is a widely used technique to produce newly low-twist and balanced torque Yarns with soft hand. In this paper, denim fabrics woven with torque-free Ring Spun Yarn and conventional Ring Spun Yarn respectively were treated with cellulase under the same condition and their fabric handle, expressed as low stress mechanical properties, such as tensile strength, bending, sheaRing, compression and surface performance were investigated by Kawabata Evaluation System for Fabric (KES-F). After cellulase treatment, both denim fabrics revealed better flexibility, elasticity recovery, raised sheaRing stiffness, fluffier and improved smoothness. While torque-free Ring Spun Yarn made denim fabric showed a better fabric handle than conventional Ring Spun Yarn made denim fabric.
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a comparative study of colour fading behaviour of cotton denim fabric manufactured by conventional Ring Spun and torque free Ring Spun Yarn by cellulase treatment
Advanced Materials Research, 2012Co-Authors: C W M Yue, W Y WongAbstract:The effect of enzyme treatment using neutral cellulase on the colour fading property of cotton denim fabric manufactured by conventional Ring-Spun and torque-free Ring-Spun Yarn was studied. Four cellulase processing parameters namely treatment temperature, treatment time, pH value and agitation were considered. In order to investigate the optimum condition for the neutral cellulsae treatment, an orthogonal analysis was used and, based on the colour fading percentage (CF%), the optimum condition for cellulase treatment on conventional Ring-Spun Yarn made denim fabric was treatment temperature = 55°C; treatment time = 60 minutes; pH value = 8 and agitation = 100 steel balls (simulated vigorous agitation) for the best colour fading achievement with desired worn and aged effect. While the optimum condition for cellulase treatment on torque-free Ring-Spun made denim fabric was treatment temperature = 50°C; treatment time = 30 minutes; pH value = 8 and agitation = 50 steel balls (simulated mild agitation) for achieving best colour fading effect. Meanwhile, the level of importance based on the orthogonal analysis of the two types of fabric was not the same.
Huang Xinxi - One of the best experts on this subject based on the ideXlab platform.
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Surface characteristics of low-twist worsted Yarns and knitted fabrics
The Hong Kong Polytechnic University, 2016Co-Authors: Huang XinxiAbstract:PolyU Library Call No.: [THS] LG51 .H577P ITC 2016 Huangxxxii, 259 pages :color illustrationsWool apparel and other textile products are of high value and popularity in the market all the time because of their aesthetic quality and comfort. With the increasing demand of light, thin and comfortable knitted fabrics, it is desirable to have wool Yarns in medium to high counts with better Yarn evenness, less hairiness, soft handle and reasonable tenacity, etc. By literature review, Ring spinning continues to predominate in worsted Yarn manufactuRing industry because of its high quality of Yarns and good flexibility in materials and Yarn count. Many modifications have been conducted to enhance the control of fibers in spinning triangle and reduce Yarn hairs, but nearly have no improvement on Yarn soft handle and evenness. However,over ten years ago, a modified technology on the Ring frame was developed by employing a false twisting device and a strand separator, which was named as Nu-torqueTM or low-torque or low-twist spinning. Since then, the technology has evolved in five versions. The low-twist cotton Yarns exceed other types of modified Ring Spun Yarns with respect to softer handle, lower residual torque, and outweigh the conventional Ring Yarns in aspects of higher tenacity, lower hairiness, etc. Previous versions of low-twist worsted Yarn technology have produced low-twist worsted Yarns in median and coarse count, however, some problems were found such as worse Yarn optical evenness, more neps and tight wrapper fibers, as well as lower Yarn tenacity, among which, the wrapper fibers give rise to obvious "bar effect" on the dyed knitted wool fabrics. Hence, this thesis is aimed at investigating these problems and exploRing possible solutions from both theoretical and practical points of views. The surface structure of 24Nm low-twist worsted Yarns are examined under Microscope Lecia M165 in details and classified into five types including three kinds of wrapping structures and two kinds of unwrapped structures. In particular, the tightly wrapping structures take up almost 60% on the low-twist Yarns. These tightly wrapping structures not only bRing about quite compact Yarn structures resulting in harsh handle of Yarns and fabrics,but also deteriorate Yarn optical evenness resulted from obviously smaller diameters than conventional Yarn structures and higher variations. Using high speed camera system, the formation of wrapper fibers on the low-twist Yarn surface has been investigated. It is found that the abrasion between Yarns or the protruding fiber ends and the upper false-twister or the lower false-twister, the fiber security of Yarns in A zone, as well as the false-twisting effects exerted by the two false-twisters, have effects on the wrapper fiber formation; more importantly, the wrapper fibers have roots in the long protruding fiber ends in A zone on the low-twist spinning system, namely, the hairiness of 3mm and longer of the Yarn segment between the spinning triangle and the false-twister. Besides, the bulked Yarn segment resulted from excessive twists in A zone is reckoned as the reason for the formation of the curved Yarns with tight wrapper fibers.Hypothesizing that the structure of Yarn segment in A zone on the low-twist spinning system is similar to that of Ring-Spun Yarns of a high twist without buckling, a hairiness model of such Ring Yarns is beneficial to understand the origin of hairiness and wrapper fibers as well as the formation of neps. The number of all fiber ends in the out-most layer of Ring-Spun Yarn cross-section, which are already or have potentials to become hairs, is first defined as maximum hairiness in unit length of Yarn. Based on Brown and Ly's work on the number of fiber ends in twist-less fiber assembly, a statistical model of the maximum hairiness of Ring Yarns has been established by consideRing Yarn twist geometry and the contributing surface layer for hairs. In particular, fiber length, fiber cross-section and the number of fibers have been revised with the consideration of Yarn twist. Moreover, Hairiness contribution factor (h0) is proposed for model development as the ratio of the number of fiber ends having potentials for hairiness and the total number of fiber ends in Yarn cross-section. From the developed model, it can be seen that the maximum hairiness of Ring Yarns, or the number of long protruding fiber ends in A zone of the low-twist spinning system, relates to fiber length distribution, fiber diameter, Yarn count, Yarn twist,measured hair length etc. Moreover, the present model provides the length of the predicted maximum hairiness, whereas previous related models fail to do so. The verification by experiments demonstrates that the predicted values of 1mm and longer are in the same order of magnitude as the measured values, which are more accurate than the predicted values from other related models. Whereas, the predicted maximum hairiness of 3mm and longer, that is, the long protruding fiber ends, is almost 1~2 order of magnitude higher than the measured S3 values. Alternatively, there are some other ways to further reduce the number of long protruding fiber ends in A zone, like combining Siro-spinning or Solo-spinning with low-twist spinning, because it is generally believed that surface fiber trapping between the two substrands in Siro-spinning triangle or among several substrands in Solo-spinning triangle contributes to the significant decrease of Yarn hairiness. Accordingly, the maximum hairiness model of Ring Yarns is revised for Siro-Spun Yarns and Solo-Spun Yarns with respect to fiber trapping and Yarn geometry, respectively. Also, experiments have been carried out to verify the developed hairiness models.As aforementioned before, the fiber security of the Yarn segment in A zone also influence the wrapper fiber formation and the resultant Yarn surface; and the degree of fiber ends being tucked into Yarn bodies directly determines the number of protruding hair of Yarns. Whereas, the existing related parameters only describe fiber ends already protruding out of Yarns. Similar to the theoretical limit of Yarn evenness CVlim, the real Yarn hairiness can approach but is always lower than the maximum hairiness of Ring Yarns. A Relative Hairiness Index (RHI) is accordingly proposed, which has two forms:the theoretical one and the actual one. The theoretical RHI is the ratio of maximum hairiness of certain type of Yarn to the maximum hairiness of Ring Yarns, which can theoretically reveal the effectiveness of different spinning methods in tucking fiber ends into Yarn bodies; and the so-called actual RHI is the ratio of the measured Yarn hairiness and the maximum hairiness of Ring Yarns, which can actually demonstrate the degree of fiber ends potential for hairiness being tucked into Yarns resulted from various spinning system or their spinning parameters. Both the theoretical RHI and the actual RHI demonstrate that Siro-spinning can most effectively tuck fiber ends into Yarn bodies, therefore Siro-Spun feeding will give rise to the least long protruding fiber ends. Additionally, winding is employed to mimic the abrasion that Yarn will experience, and it is found that the hairiness of Ring Yarns obviously increases with the increasing winding times and reaches a plateau after the fourth winding, therefore the number of hairs of Yarns after four-time winding, is termed as stable hairiness. By analyzing the increment rate of the actual RHI of various Yarns in the states of cop, cone and stable, which are the Yarns experience zero-time, one-time and four-time winding, respectively, Siro-pun Yarns also present the best fiber security.Hence, Siro-Spun feeding with a normal roving gap of 14mm is combined with the lately 5th version of low-twist spinning system for further reducing the wrapper fibers and improving the surface of low-twist Yarns. However, aiming at Yarn evenness and tenacity, as well as proper twists in A zone to avoid bulking as described before, the spinning parameters of 36Nm low-twist Yarns (36LT) is first systematically optimized by means of the combination of Fractional Factorial Methodology and Response Surface Methodology, respectively. With a twist multiplier reduced by around 15%, the optimized 36LT Yarns show comparable tenacity and similar hairiness, but still a bit worse evenness and more neps than the conventional Yarns. Actually, the number of neps (+140%) has been reduced about one order of magnitude on the present low-twist Yarns by compaRing with that of Yarns produced on the previous versions of low-twist spinning system. The blackboard evenness of the optimized 36LT Yarns exhibits half grade lower than the conventional Yarns with a twist multiplier higher by about 15%, but half grade higher than the counterparts with the same level of twist multiplier, respectively. Then, the spinning parameters of 36Nm low-twist Yarns with double-roving feeding (36LT+Siro) are also optimized by using Response Surface Methodology. The tightly wrapped structures on the optimized 36LT Yarns only account for 8.9%, whereas the ones on the optimized 36LT+Siro Yarns even reduce to 5.8%.Moreover, nearly no tightly wrapped structures with a curved Yarn body are found on the two optimized Yarn surfaces. Therefore, the optimized spinning parameters of low-twist spinning system, as well as the incorporation of Siro-spinning not only facilitate the reduction of wrapper fibers on the resultant Yarns, but also provide suitable twists in A zone to avoid producing buckling and curved Yarn segments. Nevertheless, the optimized 36LT Yarn has an obviously higher actual RHI than the conventional Ring Yarns, and it presents similar increment rate when enduRing abrasion to that of its counterpart, which indicates that the optimized 36LT Yarns possess low fiber tucking and security, in other words, the fiber deformation resulted from false-twisting effect fails to be held in Yarns. But the actual RHI of the optimized 36LT+Siro Yarn and its increment rate by abrasion are markedly lower than the ones of the conventional Yarn, particularly, its increment rate is even similar to that of Solo-Spun Yarns. It is demonstrated that the fiber tucking and security of low-twist Yarns can also be improved by integrating Siro-spinning system.Finally, using the Kawabata Evaluation System of Fabric (KES-F), the knitted fabrics made of the optimized 36LT Yarns are examined in terms of fabric surface property, tensile and shear, as well as bending and compression. There are no statistically significant differences in surface property,tensile, shear, bending, compression and bursting strength between the low-twist fabrics and the conventional fabrics made of the worsted Yarns with a higher twist multiplier by around 15% (at a significant level of 0.05). However, the low-twist fabric possesses better pilling performance and air permeability, but lower thermal conductivity than its counterpart. Besides, nearly no "bar effect" is found on the resultant fabrics made of the optimized 36LT Yarns.Institute of Textiles and ClothingPh.D., Institute of Textiles and Clothing, The Hong Kong Polytechnic University, 2016Doctorat
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Surface characteristics of low-twist worsted Yarns and knitted fabrics
The Hong Kong Polytechnic University, 2016Co-Authors: Huang XinxiAbstract:PolyU Library Call No.: [THS] LG51 .H577P ITC 2016 Huangxxxii, 259 pages :color illustrationsWool apparel and other textile products are of high value and popularity in the market all the time because of their aesthetic quality and comfort. With the increasing demand of light, thin and comfortable knitted fabrics, it is desirable to have wool Yarns in medium to high counts with better Yarn evenness, less hairiness, soft handle and reasonable tenacity, etc. By literature review, Ring spinning continues to predominate in worsted Yarn manufactuRing industry because of its high quality of Yarns and good flexibility in materials and Yarn count. Many modifications have been conducted to enhance the control of fibers in spinning triangle and reduce Yarn hairs, but nearly have no improvement on Yarn soft handle and evenness. However,over ten years ago, a modified technology on the Ring frame was developed by employing a false twisting device and a strand separator, which was named as Nu-torqueTM or low-torque or low-twist spinning. Since then, the technology has evolved in five versions. The low-twist cotton Yarns exceed other types of modified Ring Spun Yarns with respect to softer handle, lower residual torque, and outweigh the conventional Ring Yarns in aspects of higher tenacity, lower hairiness, etc. Previous versions of low-twist worsted Yarn technology have produced low-twist worsted Yarns in median and coarse count, however, some problems were found such as worse Yarn optical evenness, more neps and tight wrapper fibers, as well as lower Yarn tenacity, among which, the wrapper fibers give rise to obvious "bar effect" on the dyed knitted wool fabrics. Hence, this thesis is aimed at investigating these problems and exploRing possible solutions from both theoretical and practical points of views. The surface structure of 24Nm low-twist worsted Yarns are examined under Microscope Lecia M165 in details and classified into five types including three kinds of wrapping structures and two kinds of unwrapped structures. In particular, the tightly wrapping structures take up almost 60% on the low-twist Yarns. These tightly wrapping structures not only bRing about quite compact Yarn structures resulting in harsh handle of Yarns and fabrics,but also deteriorate Yarn optical evenness resulted from obviously smaller diameters than conventional Yarn structures and higher variations. Using high speed camera system, the formation of wrapper fibers on the low-twist Yarn surface has been investigated. It is found that the abrasion between Yarns or the protruding fiber ends and the upper false-twister or the lower false-twister, the fiber security of Yarns in A zone, as well as the false-twisting effects exerted by the two false-twisters, have effects on the wrapper fiber formation; more importantly, the wrapper fibers have roots in the long protruding fiber ends in A zone on the low-twist spinning system, namely, the hairiness of 3mm and longer of the Yarn segment between the spinning triangle and the false-twister. Besides, the bulked Yarn segment resulted from excessive twists in A zone is reckoned as the reason for the formation of the curved Yarns with tight wrapper fibers.Hypothesizing that the structure of Yarn segment in A zone on the low-twist spinning system is similar to that of Ring-Spun Yarns of a high twist without buckling, a hairiness model of such Ring Yarns is beneficial to understand the origin of hairiness and wrapper fibers as well as the formation of neps. The number of all fiber ends in the out-most layer of Ring-Spun Yarn cross-section, which are already or have potentials to become hairs, is first defined as maximum hairiness in unit length of Yarn. Based on Brown and Ly's work on the number of fiber ends in twist-less fiber assembly, a statistical model of the maximum hairiness of Ring Yarns has been established by consideRing Yarn twist geometry and the contributing surface layer for hairs. In particular, fiber length, fiber cross-section and the number of fibers have been revised with the consideration of Yarn twist. Moreover, Hairiness contribution factor (h0) is proposed for model development as the ratio of the number of fiber ends having potentials for hairiness and the total number of fiber ends in Yarn cross-section. From the developed model, it can be seen that the maximum hairiness of Ring Yarns, or the number of long protruding fiber ends in A zone of the low-twist spinning system, relates to fiber length distribution, fiber diameter, Yarn count, Yarn twist,measured hair length etc. Moreover, the present model provides the length of the predicted maximum hairiness, whereas previous related models fail to do so. The verification by experiments demonstrates that the predicted values of 1mm and longer are in the same order of magnitude as the measured values, which are more accurate than the predicted values from other related models. Whereas, the predicted maximum hairiness of 3mm and longer, that is, the long protruding fiber ends, is almost 1~2 order of magnitude higher than the measured S3 values. Alternatively, there are some other ways to further reduce the number of long protruding fiber ends in A zone, like combining Siro-spinning or Solo-spinning with low-twist spinning, because it is generally believed that surface fiber trapping between the two substrands in Siro-spinning triangle or among several substrands in Solo-spinning triangle contributes to the significant decrease of Yarn hairiness. Accordingly, the maximum hairiness model of Ring Yarns is revised for Siro-Spun Yarns and Solo-Spun Yarns with respect to fiber trapping and Yarn geometry, respectively. Also, experiments have been carried out to verify the developed hairiness models.As aforementioned before, the fiber security of the Yarn segment in A zone also influence the wrapper fiber formation and the resultant Yarn surface; and the degree of fiber ends being tucked into Yarn bodies directly determines the number of protruding hair of Yarns. Whereas, the existing related parameters only describe fiber ends already protruding out of Yarns. Similar to the theoretical limit of Yarn evenness CVlim, the real Yarn hairiness can approach but is always lower than the maximum hairiness of Ring Yarns. A Relative Hairiness Index (RHI) is accordingly proposed, which has two forms:the theoretical one and the actual one. The theoretical RHI is the ratio of maximum hairiness of certain type of Yarn to the maximum hairiness of Ring Yarns, which can theoretically reveal the effectiveness of different spinning methods in tucking fiber ends into Yarn bodies; and the so-called actual RHI is the ratio of the measured Yarn hairiness and the maximum hairiness of Ring Yarns, which can actually demonstrate the degree of fiber ends potential for hairiness being tucked into Yarns resulted from various spinning system or their spinning parameters. Both the theoretical RHI and the actual RHI demonstrate that Siro-spinning can most effectively tuck fiber ends into Yarn bodies, therefore Siro-Spun feeding will give rise to the least long protruding fiber ends. Additionally, winding is employed to mimic the abrasion that Yarn will experience, and it is found that the hairiness of Ring Yarns obviously increases with the increasing winding times and reaches a plateau after the fourth winding, therefore the number of hairs of Yarns after four-time winding, is termed as stable hairiness. By analyzing the increment rate of the actual RHI of various Yarns in the states of cop, cone and stable, which are the Yarns experience zero-time, one-time and four-time winding, respectively, Siro-pun Yarns also present the best fiber security.Hence, Siro-Spun feeding with a normal roving gap of 14mm is combined with the lately 5th version of low-twist spinning system for further reducing the wrapper fibers and improving the surface of low-twist Yarns. However, aiming at Yarn evenness and tenacity, as well as proper twists in A zone to avoid bulking as described before, the spinning parameters of 36Nm low-twist Yarns (36LT) is first systematically optimized by means of the combination of Fractional Factorial Methodology and Response Surface Methodology, respectively. With a twist multiplier reduced by around 15%, the optimized 36LT Yarns show comparable tenacity and similar hairiness, but still a bit worse evenness and more neps than the conventional Yarns. Actually, the number of neps (+140%) has been reduced about one order of magnitude on the present low-twist Yarns by compaRing with that of Yarns produced on the previous versions of low-twist spinning system. The blackboard evenness of the optimized 36LT Yarns exhibits half grade lower than the conventional Yarns with a twist multiplier higher by about 15%, but half grade higher than the counterparts with the same level of twist multiplier, respectively. Then, the spinning parameters of 36Nm low-twist Yarns with double-roving feeding (36LT+Siro) are also optimized by using Response Surface Methodology. The tightly wrapped structures on the optimized 36LT Yarns only account for 8.9%, whereas the ones on the optimized 36LT+Siro Yarns even reduce to 5.8%.Moreover, nearly no tightly wrapped structures with a curved Yarn body are found on the two optimized Yarn surfaces. Therefore, the optimized spinning parameters of low-twist spinning system, as well as the incorporation of Siro-spinning not only facilitate the reduction of wrapper fibers on the resultant Yarns, but also provide suitable twists in A zone to avoid producing buckling and curved Yarn segments. Nevertheless, the optimized 36LT Yarn has an obviously higher actual RHI than the conventional Ring Yarns, and it presents similar increment rate when enduRing abrasion to that of its counterpart, which indicates that the optimized 36LT Yarns possess low fiber tucking and security, in other words, the fiber deformation resulted from false-twisting effect fails to be held in Yarns. But the actual RHI of the optimized 36LT+Siro Yarn and its increment rate by abrasion are markedly lower than the ones of the conventional Yarn, particularly, its increment rate is even similar to that of Solo-Spun Yarns. It is demonstrated that the fiber tucking and security of low-twist Yarns can also be improved by integrating Siro-spinning system.Finally, using the Kawabata Evaluation System of Fabric (KES-F), the knitted fabrics made of the optimized 36LT Yarns are examined in terms of fabric surface property, tensile and shear, as well as bending and compression. There are no statistically significant differences in surface property,tensile, shear, bending, compression and bursting strength between the low-twist fabrics and the conventional fabrics made of the worsted Yarns with a higher twist multiplier by around 15% (at a significant level of 0.05). However, the low-twist fabric possesses better pilling performance and air permeability, but lower thermal conductivity than its counterpart. Besides, nearly no "bar effect" is found on the resultant fabrics made of the optimized 36LT Yarns.Institute of Textiles and ClothingPh.D., Institute of Textiles and Clothing, The Hong Kong Polytechnic University, 2016Doctoratepublished_fina
Naveed Mengal - One of the best experts on this subject based on the ideXlab platform.
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blended Yarn analysis part ii influence of twist multiplier and back roller cot hardness on mass variation hairiness and physical properties of 15 tex pes co blended Ring Spun Yarn
Journal of Natural Fibers, 2013Co-Authors: Samander Ali Malik, Naveed Mengal, Sidra Saleemi, S A AbbasiAbstract:The present study was undertaken to investigate the effect of twist multiplier and back roller cot hardness on the characteristics of PES/CO-blended Ring-Spun Yarn. Yarn samples of 15 tex were Spun from three blend ratios, i.e., PES/CO 30/70, 50/50, and 70/30 at Ring frame at seven different twist multipliers and three back roller cot shores. Yarn samples were analyzed at Uster Tester 4 and Uster Tansorapid 4 for evenness and physical properties, respectively. The results indicate that hairiness is inversely related to twist multiplier, whereas Yarn physical properties improved in PES/CO 30/70 with addition of twist and an inverse trend was observed in other two blend ratios. Back roller cot hardness has positive correlation with CV% and imperfections and negative correlation with Yarn physical properties.
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blended Yarn analysis part i influence of blend ratio and break draft on mass variation hairiness and physical properties of 15 tex pes co blended Ring Spun Yarn
Journal of Natural Fibers, 2012Co-Authors: Samander Ali Malik, Uzma Syed, Anwaruddi Tanwari, R F Qureshi, Naveed MengalAbstract:This study was undertaken to investigate the effect of P/C blend ratio and break draft on Yarn quality and physical properties. 15 tex Yarn samples were Spun from three blend ratios, i.e., P/C 30/70, 50/50, and 70/30 at Ring frame with six break drafts (1.35, 1.38, 1.42, 1.45, 1.49, and 1.53). The results of blend ratio were analyzed through linear regression technique to predict correlation between two variables. Strong correlation observed between blend ratio and Yarn quality and physical properties, as the share of polyester increased all Yarn characteristics improved. Prominent improvement in Yarn mass variation and hairiness was observed when polyester percentage increased from 30% to 50% whereas tenacity and elongation improved more remarkably when polyester share increased to 70% from 50%. Most of the Yarn characteristics were found optimum at break draft 1.49.
Samander Ali Malik - One of the best experts on this subject based on the ideXlab platform.
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blended Yarn analysis part ii influence of twist multiplier and back roller cot hardness on mass variation hairiness and physical properties of 15 tex pes co blended Ring Spun Yarn
Journal of Natural Fibers, 2013Co-Authors: Samander Ali Malik, Naveed Mengal, Sidra Saleemi, S A AbbasiAbstract:The present study was undertaken to investigate the effect of twist multiplier and back roller cot hardness on the characteristics of PES/CO-blended Ring-Spun Yarn. Yarn samples of 15 tex were Spun from three blend ratios, i.e., PES/CO 30/70, 50/50, and 70/30 at Ring frame at seven different twist multipliers and three back roller cot shores. Yarn samples were analyzed at Uster Tester 4 and Uster Tansorapid 4 for evenness and physical properties, respectively. The results indicate that hairiness is inversely related to twist multiplier, whereas Yarn physical properties improved in PES/CO 30/70 with addition of twist and an inverse trend was observed in other two blend ratios. Back roller cot hardness has positive correlation with CV% and imperfections and negative correlation with Yarn physical properties.
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blended Yarn analysis part i influence of blend ratio and break draft on mass variation hairiness and physical properties of 15 tex pes co blended Ring Spun Yarn
Journal of Natural Fibers, 2012Co-Authors: Samander Ali Malik, Uzma Syed, Anwaruddi Tanwari, R F Qureshi, Naveed MengalAbstract:This study was undertaken to investigate the effect of P/C blend ratio and break draft on Yarn quality and physical properties. 15 tex Yarn samples were Spun from three blend ratios, i.e., P/C 30/70, 50/50, and 70/30 at Ring frame with six break drafts (1.35, 1.38, 1.42, 1.45, 1.49, and 1.53). The results of blend ratio were analyzed through linear regression technique to predict correlation between two variables. Strong correlation observed between blend ratio and Yarn quality and physical properties, as the share of polyester increased all Yarn characteristics improved. Prominent improvement in Yarn mass variation and hairiness was observed when polyester percentage increased from 30% to 50% whereas tenacity and elongation improved more remarkably when polyester share increased to 70% from 50%. Most of the Yarn characteristics were found optimum at break draft 1.49.
