The Experts below are selected from a list of 204 Experts worldwide ranked by ideXlab platform

S M Ishtiaque - One of the best experts on this subject based on the ideXlab platform.

  • Influence of process parameters on properties of open-end and core-sheath friction spun acrylic yarns
    Journal of the Textile Institute, 2007
    Co-Authors: A. Das, S M Ishtiaque, P. Vishnoi
    Abstract:

    Abstract The present paper is concerned with the influence of Opening Roller speed, difference in drum speed and suction air pressure on properties of acrylic open-end and core-sheath friction spun yarns. The results show that Opening Roller speed and suction air pressure have significant influence on properties of open-end friction spun yarns. In the case of core-sheath yarns, suction air pressure has influence on yarn tenacity and hairiness. However, yarn unevenness and imperfection are not significantly influenced by experimental variables. The results also show that core-sheath friction spun yarns have significantly higher yarn tenacity, modulus and work of rupture and have a lower level of yarn unevenness, imperfections, hairiness, and breaking elongation than open-end friction spun yarns.

  • Friction spinning machine variable and yarn structure: Configuration of fibres in yarn in relation to machine variables
    Journal of the Textile Institute, 2007
    Co-Authors: S M Ishtiaque, A. Das, Prashant
    Abstract:

    Abstract This article reports detailed study on the impact of some DREF-III machine variables (i.e. Opening Roller speed, suction air pressure and difference in drum speed) and sliver feeding positions on configuration of fibres in the yarn. It has been observed that percentages of leading and trailing hooks are significantly influenced by the feeding position of sliver. The machine variables also found to have significant influence on fibre configuration in most of the cases. The configuration of fibres is found to be controlled by air flow characteristics inside the duct and by landing behaviour of fibres on the spinning drums. In addition, it has been found that the machine variables have least impact on configuration of core fibres.

  • Influence of process parameters on air speed in fibre transport duct of the DREF-III machine: Part I
    Journal of the Textile Institute, 2006
    Co-Authors: S M Ishtiaque, P. Vishnoi, A. Das, S. N. Singh
    Abstract:

    Abstract The present work deals with the measurement of air flow in the transport duct of the DREFIII friction spinning machine. In this work, the direction and speed of air inside the transport duct was measured with the help of a three-hole probe. Turbulence in the air flow was assessed with the help of a tuft probe. The influence of Opening Roller speed, drum speed difference and suction air pressure was studied on air speed inside the transport duct. The results show that air flow near the inlet zone of the duct is highly turbulent and there are large deviations in air velocity and direction of air flow. The middle zone of the inlet of the duct has much more streamlined flow. However, the variation in air speed and direction of air flow is comparatively less near the duct. It is also observed that air velocity in the duct is mainly influenced by the Opening Roller speed followed by suction air pressure. Drum speed difference does not have significant influence on the air velocity in the duct.

  • Influence of process parameters on migrational characteristics of open-end and core-sheath friction spun yarns
    Journal of the Textile Institute, 2006
    Co-Authors: S M Ishtiaque, A. Das, P. Vishnoi
    Abstract:

    Abstract The migration characteristics of open-end and sheath fibres of core-sheath friction spun yarn have been studied using the tracer fibre technique. In open-end friction spun yarns, migration parameters were studied in both two-dimensional and three-dimensional projection methods. From the analysis, it has been observed that three-dimensional studies give higher mean fibre position (MFP), root mean square (RMS) deviation and mean migration intensity (MMI) than two-dimensional studies. The results show that fibres from first sliver feeding position have significantly higher MFP, RMS deviation and MMI than fifth sliver feeding position. The results also show that trailing half of fibres for first sliver feeding position has higher MFP, RMS deviation and MMI than leading half of fibres for both types of yarns. The migration parameters are mainly influenced by suction air pressure followed by Opening Roller speed and difference in drum speed for both open-end and core-sheath friction yarns. In open-end ...

  • Twist structural characteristics of friction spun yarns
    Journal of The Textile Institute, 2005
    Co-Authors: S M Ishtiaque, P. Vishnoi
    Abstract:

    Abstract The present work is concerned with the study of the twist structure of open end and core-sheath friction spun yarns. The process variables chosen are Opening Roller speed, difference in spinning drum speed, suction air pressure and sheath sliver feeding position. A three-variable factorial design method proposed by Box and Behken has been used. The influence of sheath sliver position on twist structure is also studied. An analysis of the twist level and helix angle at both the trailing and leading half of the individual fibre has been carried out to quantify the twist structure of friction spun yarn. For both types of yarns the leading half of the fibres has less twist than the trailing half. Under similar conditions of spinning, the twist level of open-end friction spun yarns is significantly higher than that of core-sheath friction spun yarn. In core-sheath friction spun yarns, the core fibres have a low level of twist but have significantly higher twist near the trailing end in Z-direction.

Jun Wang - One of the best experts on this subject based on the ideXlab platform.

  • Investigation of the concurrent sliver-Opening mechanism and unveiling features of the new dual-feed rotor spinning concept
    The Journal of The Textile Institute, 2018
    Co-Authors: Nicholus Tayari Akankwasa, Huiting Lin, Jun Wang
    Abstract:

    AbstractTo examine the effectiveness of the new dual-feed rotor spinning system, we performed a set of experiments to assess the influence of the Opening Roller type, sliver feed method, and direction of fiber feeding into the rotor on the quality of a polyester/cotton blend yarn. Six yarn samples of 58tex consisting of 55/45 polyester/cotton were prepared in this study. Their respective properties, such as tenacity, elongation at break, mass irregularity, hairiness, thick (+35%) and thin (−30%) places were tested and statistically analyzed using Minitab. ANOVA analysis showed that the tested yarn quality properties were statistically significant among groups except for thick places (+35%). Tukey’s post hoc test based on the honest significant difference was performed to determine the implication of results within groups at the value of α = 0.05. The dual-feed blend yarn (PCLR) spun with Opening Roller type OK37 on the left and OK40 on the right exhibited superior yarn quality characteristics compared to ...

  • Rotor spinning transfer channel design optimization via computational fluid dynamics
    'SAGE Publications', 2018
    Co-Authors: Huiting Lin, Bergadà Granyó, Josep Maria, Yongchun Zeng, Nicholus T Akankwasa, Yuze Zhang, Jun Wang
    Abstract:

    The conventional rotor spinning unit generates flow vortices in the transfer channel upstream region which affect the fiber configuration and consequently yarn properties. Geometry and spinning parameters such as transfer channel length, inlet width, rotor outlet pressure, Opening Roller speed, and diameter were found to be key parameters influencing airflow characteristics. To reduce the flow vortices in the upper stream region, modifications of the transfer channel were proposed, and their airflow fields were analyzed using computational fluid dynamics. Three designs were studied: a round transfer channel inlet, a bypass channel for extra air supply, and one with both the bypass and the round inlet. Analysis of airflow revealed that the design with both round transfer channel inlet and a bypass proved to be very effective in properly directing the flow and minimizing vortices. The design was also characterized by smoother velocity streamlines and maximum mass flow across the transfer channel. A conventional rotor spinning unit was modified in which a round transfer channel inlet corner and a bypass channel were utilized to conduct the experimental tests. Three sets of yarn samples were produced using the conventional and modified rotor spinning units under different rotor speed conditions. Yarn properties were tested. Properties such as tenacity, CVm%, and thin and thick places of the spun yarns produced by the new design improved compared to that of the conventional yarn.Peer Reviewe

  • Rotor spinning transfer channel design optimization via computational fluid dynamics
    Textile Research Journal, 2017
    Co-Authors: Huiting Lin, Nicholus Tayari Akankwasa, J. M. Bergada, Zeng Yongchun, Zhang Yuze, Jun Wang
    Abstract:

    The conventional rotor spinning unit generates flow vortices in the transfer channel upstream region which affect the fiber configuration and consequently yarn properties. Geometry and spinning parameters such as transfer channel length, inlet width, rotor outlet pressure, Opening Roller speed, and diameter were found to be key parameters influencing airflow characteristics. To reduce the flow vortices in the upper stream region, modifications of the transfer channel were proposed, and their airflow fields were analyzed using computational fluid dynamics. Three designs were studied: a round transfer channel inlet, a bypass channel for extra air supply, and one with both the bypass and the round inlet. Analysis of airflow revealed that the design with both round transfer channel inlet and a bypass proved to be very effective in properly directing the flow and minimizing vortices. The design was also characterized by smoother velocity streamlines and maximum mass flow across the transfer channel. A conventi...

  • Optimum selection of the Opening Roller and navel for rotor spun silk/cashmere blended yarn
    Fibres & Textiles in Eastern Europe, 2010
    Co-Authors: Ildephonse Nibikora, Jun Wang
    Abstract:

    Machine part selection in rotor spinning from possible alternatives with different properties and performance levels in terms of yarn quality is a difficult task. Classical statistical methods have been used to solve the problem, but the priorities and preferences to obtain the end product characteristics desired have not been taken into consideration. The best type of Opening Roller and navel depends on the type of fibre and yarn. This paper studies rotor spinning blended yarn produced from spun silk and cashmere. Nine samples were spun from three different Opening Rollers and navels. According to the Uster test results of yarn quality properties, optimum selection was achieved using the multi-objective fuzzy optimal model. A pin type Roller and spiral grooved ceramic were the best choice for spinning stability and yarn quality properties.

P. Vishnoi - One of the best experts on this subject based on the ideXlab platform.

  • Influence of process parameters on properties of open-end and core-sheath friction spun acrylic yarns
    Journal of the Textile Institute, 2007
    Co-Authors: A. Das, S M Ishtiaque, P. Vishnoi
    Abstract:

    Abstract The present paper is concerned with the influence of Opening Roller speed, difference in drum speed and suction air pressure on properties of acrylic open-end and core-sheath friction spun yarns. The results show that Opening Roller speed and suction air pressure have significant influence on properties of open-end friction spun yarns. In the case of core-sheath yarns, suction air pressure has influence on yarn tenacity and hairiness. However, yarn unevenness and imperfection are not significantly influenced by experimental variables. The results also show that core-sheath friction spun yarns have significantly higher yarn tenacity, modulus and work of rupture and have a lower level of yarn unevenness, imperfections, hairiness, and breaking elongation than open-end friction spun yarns.

  • Influence of process parameters on air speed in fibre transport duct of the DREF-III machine: Part I
    Journal of the Textile Institute, 2006
    Co-Authors: S M Ishtiaque, P. Vishnoi, A. Das, S. N. Singh
    Abstract:

    Abstract The present work deals with the measurement of air flow in the transport duct of the DREFIII friction spinning machine. In this work, the direction and speed of air inside the transport duct was measured with the help of a three-hole probe. Turbulence in the air flow was assessed with the help of a tuft probe. The influence of Opening Roller speed, drum speed difference and suction air pressure was studied on air speed inside the transport duct. The results show that air flow near the inlet zone of the duct is highly turbulent and there are large deviations in air velocity and direction of air flow. The middle zone of the inlet of the duct has much more streamlined flow. However, the variation in air speed and direction of air flow is comparatively less near the duct. It is also observed that air velocity in the duct is mainly influenced by the Opening Roller speed followed by suction air pressure. Drum speed difference does not have significant influence on the air velocity in the duct.

  • Influence of process parameters on migrational characteristics of open-end and core-sheath friction spun yarns
    Journal of the Textile Institute, 2006
    Co-Authors: S M Ishtiaque, A. Das, P. Vishnoi
    Abstract:

    Abstract The migration characteristics of open-end and sheath fibres of core-sheath friction spun yarn have been studied using the tracer fibre technique. In open-end friction spun yarns, migration parameters were studied in both two-dimensional and three-dimensional projection methods. From the analysis, it has been observed that three-dimensional studies give higher mean fibre position (MFP), root mean square (RMS) deviation and mean migration intensity (MMI) than two-dimensional studies. The results show that fibres from first sliver feeding position have significantly higher MFP, RMS deviation and MMI than fifth sliver feeding position. The results also show that trailing half of fibres for first sliver feeding position has higher MFP, RMS deviation and MMI than leading half of fibres for both types of yarns. The migration parameters are mainly influenced by suction air pressure followed by Opening Roller speed and difference in drum speed for both open-end and core-sheath friction yarns. In open-end ...

  • Twist structural characteristics of friction spun yarns
    Journal of The Textile Institute, 2005
    Co-Authors: S M Ishtiaque, P. Vishnoi
    Abstract:

    Abstract The present work is concerned with the study of the twist structure of open end and core-sheath friction spun yarns. The process variables chosen are Opening Roller speed, difference in spinning drum speed, suction air pressure and sheath sliver feeding position. A three-variable factorial design method proposed by Box and Behken has been used. The influence of sheath sliver position on twist structure is also studied. An analysis of the twist level and helix angle at both the trailing and leading half of the individual fibre has been carried out to quantify the twist structure of friction spun yarn. For both types of yarns the leading half of the fibres has less twist than the trailing half. Under similar conditions of spinning, the twist level of open-end friction spun yarns is significantly higher than that of core-sheath friction spun yarn. In core-sheath friction spun yarns, the core fibres have a low level of twist but have significantly higher twist near the trailing end in Z-direction.

  • Effect of Opening Roller speed, drums speed difference and suction air pressure on properties of open-end friction spun polyester and acrylic yarns
    Fibers and Polymers, 2005
    Co-Authors: P. Vishnoi, S M Ishtiaque, A. Das
    Abstract:

    The present paper is concerned with the influence of Opening Roller speed, drum speed difference and suction air pressure on properties of polyester and acrylic open-end friction spun yarns. The results shows that the Opening Roller speed and the suction air pressure have considerable influence on the characteristics of polyester and acrylic open-end friction spun yarns. In case of polyester yarns the unevenness, imperfection and hairiness decreases and the yarn tenacity increases with the increase in Opening Roller speed and suction air pressure. However for acrylic yarns the unevenness and imperfections decreases and tenacity increases with the increase in Opening Roller speed and suction air pressure.

G. K. Tyagi - One of the best experts on this subject based on the ideXlab platform.

  • Influence of add-on spin finish and some process parameters on elastic recovery properties of polyester OE rotor-spun yarns
    2009
    Co-Authors: G. K. Tyagi
    Abstract:

    The influence of add-on spin finish and Opening Roller speed on the recovery properties of polyester OE rotor yarns spun from polyester fibres of different cross-sectional shapes and linear densities has been studied. The level of add-on finish appears to have highest influence on the recovery characteristics followed by the fibre linear density and Opening Roller speed. Higher level of add-on finish offers significant advantages in respect of immediate elastic recovery and delayed elastic recovery but adversely affects the permanent set. Reduced fibre linear density also has a potential for an appreciable increase in immediate elastic recovery and delayed elastic recovery. Lower Opening Roller speed is important for lower permanent set as well as higher immediately elastic recovery and delayed elastic recovery. Neither there are appreciable changes in immediate elastic recovery, nor are there significant differences in permanent set with the change in fibre profile. Change in amplitude and rate of extension also provides noticeable variations in the elastic recovery properties; the magnitude depends mainly on the processing parameters.

  • Influence of add-on spin finish on yarn quality in the OE spinning of polyester fibre yarns
    2008
    Co-Authors: G. K. Tyagi
    Abstract:

    The influence of add-on spin finish and Opening Roller speed on the properties of polyester OE rotor yarns spun from fibres of different cross-sectional shapes and linear densities has been studied. The level of spin finish appears to have highest influence on the yarn characteristics followed by the Opening Roller speed and fibre linear density. Higher level of spin finish offers significant advantages in respect of yarn tenacity, breaking extension, work of rupture, abrasion resistance and hairiness but adversely affects regularity and flexural rigidity. Each of these quality parameters deteriorates to different degrees with the increasing Opening Roller speed. There is also decline in properties when yarns are made from a trilobal fibre. Such a decline in properties at high Opening Roller speeds is, however, less marked in yarns spun from fine denier fibres .

  • Investigation on cotton ring-and OE rotor yarn characteristics: Part I — Effect of caustic and enzymatic scouring treatments on dye uptake and mechanical characteristics
    2007
    Co-Authors: G. K. Tyagi, Ashvani Goyal, D P Gon, D K Mahajan
    Abstract:

    The effect of scouring with enzymes and caustic soda on the mechanical and surface characteristics of cotton ring-and rotor-spun yarns has been studied. For both yarn structures, the flexural rigidity, hairiness, yarn-to-metal friction and dye uptake increase markedly on scouring with enzymes and sodium hydroxide. Conventional scouring with NaOH renders the yarns strikingly strong and less extensible. However, the tenacity of both types of yarns is considerably reduced on enzymatic scouring. Scouring causes a marked increase in dye uptake of ring-and rotor-spun yarns; the increase is, however, more in NaOH scoured yarns than in the yarns spun with identical processing conditions but scoured with enzymes. The dye uptake decreases marginally with increasing rotor speed. The effect of Opening Roller speed on uptake of dye is also minimal.

  • Effect of fibre profile, spin finish and Opening Roller speed on properties of polyester OE rotor-spun yarns
    Indian Journal of Fibre & Textile Research, 2003
    Co-Authors: G. K. Tyagi
    Abstract:

    The influence of fibre profile, spin finish and Opening Roller speed on quality of polyester OE rotor-spun yarns has been studied. The spin finish and Opening Roller interact with each other to determine yarn properties. This is because the inter-fibre friction, which depends to a large extent on the combined influence of fibre structural variants and spin finish, plays an important role in influencing fibre separation by Opening Roller. It is observed that the yarns made from a trilobal fibre are inferior to the yarns made from a circular fibre spun under the same condition in terms of tenacity, breaking extension, work of rupture, hairiness and regularity. The yarn tensile properties generally show a descending trend with increasing Opening Roller speed. The drop in tensile properties, however, depends on the level of add-on finish. The yarn regularity is also highly dependent on the add-on finish and Opening Roller speed. The yarns produced with higher Opening Roller speed show lower unevenness and fewer imperfections, particularly at higher level of add-on finish.

  • Influence of process parameters on flexural rigidity and elastic recovery of polyester OE rotor-spun yarns
    Indian Journal of Fibre & Textile Research, 2002
    Co-Authors: G. K. Tyagi, Asis Patnaik, S M Ishtiaque
    Abstract:

    Fibre cross-section is an important factor in determining flexural rigidity and elastic recovery of OE rotor-spun yams. The level of spin finish, tex twist factor, draw-off nozzle profile, rotor speed and Opening Roller speed have profound influence on flexural rigidity. The variation either in twist factor or in rotor speed hardly affects elastic recovery; the elastic recovery, however, increases with the increase in level of spin finish. The increase is highly dependent on the draw-off nozzle profile and Opening Roller speed.

A. Das - One of the best experts on this subject based on the ideXlab platform.

  • Influence of process parameters on properties of open-end and core-sheath friction spun acrylic yarns
    Journal of the Textile Institute, 2007
    Co-Authors: A. Das, S M Ishtiaque, P. Vishnoi
    Abstract:

    Abstract The present paper is concerned with the influence of Opening Roller speed, difference in drum speed and suction air pressure on properties of acrylic open-end and core-sheath friction spun yarns. The results show that Opening Roller speed and suction air pressure have significant influence on properties of open-end friction spun yarns. In the case of core-sheath yarns, suction air pressure has influence on yarn tenacity and hairiness. However, yarn unevenness and imperfection are not significantly influenced by experimental variables. The results also show that core-sheath friction spun yarns have significantly higher yarn tenacity, modulus and work of rupture and have a lower level of yarn unevenness, imperfections, hairiness, and breaking elongation than open-end friction spun yarns.

  • Friction spinning machine variable and yarn structure: Configuration of fibres in yarn in relation to machine variables
    Journal of the Textile Institute, 2007
    Co-Authors: S M Ishtiaque, A. Das, Prashant
    Abstract:

    Abstract This article reports detailed study on the impact of some DREF-III machine variables (i.e. Opening Roller speed, suction air pressure and difference in drum speed) and sliver feeding positions on configuration of fibres in the yarn. It has been observed that percentages of leading and trailing hooks are significantly influenced by the feeding position of sliver. The machine variables also found to have significant influence on fibre configuration in most of the cases. The configuration of fibres is found to be controlled by air flow characteristics inside the duct and by landing behaviour of fibres on the spinning drums. In addition, it has been found that the machine variables have least impact on configuration of core fibres.

  • Influence of process parameters on air speed in fibre transport duct of the DREF-III machine: Part I
    Journal of the Textile Institute, 2006
    Co-Authors: S M Ishtiaque, P. Vishnoi, A. Das, S. N. Singh
    Abstract:

    Abstract The present work deals with the measurement of air flow in the transport duct of the DREFIII friction spinning machine. In this work, the direction and speed of air inside the transport duct was measured with the help of a three-hole probe. Turbulence in the air flow was assessed with the help of a tuft probe. The influence of Opening Roller speed, drum speed difference and suction air pressure was studied on air speed inside the transport duct. The results show that air flow near the inlet zone of the duct is highly turbulent and there are large deviations in air velocity and direction of air flow. The middle zone of the inlet of the duct has much more streamlined flow. However, the variation in air speed and direction of air flow is comparatively less near the duct. It is also observed that air velocity in the duct is mainly influenced by the Opening Roller speed followed by suction air pressure. Drum speed difference does not have significant influence on the air velocity in the duct.

  • Influence of process parameters on migrational characteristics of open-end and core-sheath friction spun yarns
    Journal of the Textile Institute, 2006
    Co-Authors: S M Ishtiaque, A. Das, P. Vishnoi
    Abstract:

    Abstract The migration characteristics of open-end and sheath fibres of core-sheath friction spun yarn have been studied using the tracer fibre technique. In open-end friction spun yarns, migration parameters were studied in both two-dimensional and three-dimensional projection methods. From the analysis, it has been observed that three-dimensional studies give higher mean fibre position (MFP), root mean square (RMS) deviation and mean migration intensity (MMI) than two-dimensional studies. The results show that fibres from first sliver feeding position have significantly higher MFP, RMS deviation and MMI than fifth sliver feeding position. The results also show that trailing half of fibres for first sliver feeding position has higher MFP, RMS deviation and MMI than leading half of fibres for both types of yarns. The migration parameters are mainly influenced by suction air pressure followed by Opening Roller speed and difference in drum speed for both open-end and core-sheath friction yarns. In open-end ...

  • Effect of Opening Roller speed, drums speed difference and suction air pressure on properties of open-end friction spun polyester and acrylic yarns
    Fibers and Polymers, 2005
    Co-Authors: P. Vishnoi, S M Ishtiaque, A. Das
    Abstract:

    The present paper is concerned with the influence of Opening Roller speed, drum speed difference and suction air pressure on properties of polyester and acrylic open-end friction spun yarns. The results shows that the Opening Roller speed and the suction air pressure have considerable influence on the characteristics of polyester and acrylic open-end friction spun yarns. In case of polyester yarns the unevenness, imperfection and hairiness decreases and the yarn tenacity increases with the increase in Opening Roller speed and suction air pressure. However for acrylic yarns the unevenness and imperfections decreases and tenacity increases with the increase in Opening Roller speed and suction air pressure.