scholarly journals A way to reduce friction between ring and traveller of a ring spinning frame

2013 ◽  
Vol 47 (4) ◽  
pp. 421-426 ◽  
Author(s):  
HA Begum ◽  
MM Helali
Keyword(s):  
Centrifugal Force ◽  
Spindle Speed ◽  
Limiting Factor ◽  
Ring Spinning ◽  
Mechanical Process ◽  
Yarn Tension ◽  
Intermittent Contact ◽  
System Vibration

The paper presents a method, which applied to the ring of the ring spinning machine will improve its productivity. Through the system vibration is applied on the ring-traveller, which has effects on the centrifugal force of the traveller and helps the traveller to rotate around ring with intermittent contact. The effect of vibration on yarn tension as well as friction between the ring and the traveler and the corresponding raise in temperature of the ring during spinning are measured. An external facility is designed and incorporated in a miniature ring spinning frame to generate and apply vibration to the ring. The miniature ring spinning frame has the facility to vary twist and count of yarn and is modified to vary the spindle speed. Study shows that the ringtraveller friction is affected by the application of vibration. Results obtained with and without the applications of vibration are compared. It is found that yarn tension and friction between the ring and the traveller reduce significantly depending on the type of vibration. Therefore it can be concluded that application of vibration may be a way to reduce friction between the ring and the traveler and thus the mechanical process of twisting and winding can be done at higher speed for higher productivity which is a limiting factor of ring spinning system. Bangladesh J. Sci. Ind. Res. 47(4), 421-426, 2012 DOI: http://dx.doi.org/10.3329/bjsir.v47i4.14072

scholarly journals Mathematical Modeling of Dynamic Yarn Path Considering the Balloon Control Ring and Yarn Elasticity in the Ring Spinning Process Based on the Superconducting Bearing Twisting Element

2018 ◽  
Vol 26 (5(131)) ◽  
pp. 32-40 ◽  
Author(s):  
Mahmud Hossain ◽  
Christian Telke ◽  
Anwar Abdkader ◽  
Maria Sparing ◽  
Tilo Espenhahn ◽  
...  
Keyword(s):  
Magnetic Bearing ◽  
Spindle Speed ◽  
Frictional Heat ◽  
Ring Spinning ◽  
German Research Foundation ◽  
Yarn Tension ◽  
Tension Distribution ◽  
Spinning Process ◽  
Fundamental Research ◽  
Superconducting Magnetic Bearing

The productivity of the conventional ring spinning process is currently limited by the frictional heat that occurs in the ring/traveler twisting system. In the framework of a fundamental research project from the German Research Foundation (DFG), the levitation principle of superconducting magnetic bearing (SMB) was implemented as a twisting element in order to eliminate the frictional problem and thus aim, at least, to double the productivity. A mathematical model of the dynamic yarn path has already been presented considering the friction free SMB system up to an angular spindle speed of 25,000 r.p.m. In this paper, the existing theoretical model, which was developed up to 25,000 r.p.m, was further modified considering the balloon control ring and yarn elasticity at a higher angular spindle speed, such as 50,000 r.p.m. The model was solved numerically using the RUNGE-KUTTA method. With this model, it is possible to estimate the yarn tension distribution and balloon form considering the above-mentioned parameters. The model established was further validated by comparing the yarn tension and balloon forms predicted with measured ones up to an angular spindle speed of 15,000 r.p.m in a ring spinning tester based on superconducting magnetic bearing.

In situ measurement of the dynamic yarn path in a turbo ring spinning process based on the superconducting magnetic bearing twisting system

2019 ◽  
Vol 90 (7-8) ◽  
pp. 951-968
Author(s):  
M Hossain ◽  
M Sparing ◽  
T Espenhahn ◽  
A Abdkader ◽  
C Cherif ◽  
...  
Keyword(s):  
Process Parameters ◽  
Research Work ◽  
Magnetic Bearing ◽  
Spindle Speed ◽  
In Situ Measurement ◽  
Ring Spinning ◽  
Yarn Tension ◽  
Yarn Guide ◽  
Superconducting Magnetic Bearing

The yarn tension and balloon form are the most important physical process parameters to characterize the dynamic yarn path in ring spinning. The present research work focuses on the in situ measurement of yarn tension in different regions of the yarn path in a developed turbo ring spinning tester with a friction-free superconducting magnetic bearing (SMB) twisting system and at an angular spindle speed of up to 50,000 rpm. The influence of different parameters, such as angular spindle speeds (15,000–50,000 rpm), yarn counts (15–40 tex) and balloon control ring (one or multiple), were evaluated to identify the influence of acting forces, for example, centrifugal forces. The effects of these process parameters were analyzed statistically using an analysis of variance. The yarn tension between the delivery rollers and the yarn guide was measured using a modified one-roller tensile yarn tension sensor. The yarn tension between the yarn guide and the SMB system was determined with an already existing optical approach at a higher angular spindle speed. As the highest yarn tension theoretically occurs between the SMB system and the cop, it was estimated in this region by measuring the coefficient of friction between the yarn and the yarn guide using the friction module of the constant tension tester equipment. The maximum balloon diameter was determined from the recorded balloon form between the yarn guide and the SMB system with respect to different angular spindle speeds. The results provide valuable information about the highest possible spinnable speed and enable a better understanding of the dynamic yarn path in the SMB spinning system.

High-Frequency Yarn Tension Variations in Spinning

1980 ◽  
Vol 102 (1) ◽  
pp. 45-50
Author(s):  
E. Dyson ◽  
G. Afshari
Keyword(s):  
Experimental Investigation ◽  
Periodic Structure ◽  
Coefficient Of Variation ◽  
Rotational Speed ◽  
High Frequency ◽  
Ring Spinning ◽  
Statistical Parameters ◽  
Yarn Tension ◽  
Rotor Spinning

A description of an experimental investigation of the variations in yarn tension during both ring and rotor open-end spinning which have frequencies equal to, or greater than, the rotational speed of the system is given. Typical results are illustrated and discussed both in terms of statistical parameters such as the coefficient of variation and in terms of their spectra. Tension variations during rotor spinning are shown to have, in general, a much less pronounced periodic structure then the corresponding variations during ring spinning.

scholarly journals Mathematical modeling, simulation and validation of the dynamic yarn path in a superconducting magnet bearing (SMB) ring spinning system

2016 ◽  
Vol 87 (8) ◽  
pp. 1011-1022 ◽  
Author(s):  
M Hossain ◽  
C Telke ◽  
M Sparing ◽  
A Abdkader ◽  
A Nocke ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
High Speed ◽  
New Technology ◽  
Superconducting Magnet ◽  
Magnetic Bearing ◽  
Ring Spinning ◽  
Yarn Tension ◽  
Runge Kutta Method ◽  
Superconducting Ring ◽  
Superconducting Magnetic Bearing

The new concept of a superconducting magnetic bearing (SMB) system can be implemented as a twisting element instead of the existing one in a ring spinning machine, thus overcoming one of its main frictional limitations. In the SMB, a permanent magnet (PM) ring rotates freely above the superconducting ring due to the levitation forces. The revolution of the PM ring imparts twists similarly to the traveler in the existing twisting system. In this paper, the forces acting on the dynamic yarn path resulting from this new technology are investigated and described with a mathematical model. The equation of yarn movement between the delivery rollers and the PM ring is integrated with the Runge-Kutta method using MATLAB. Thus, the developed model can estimate the yarn tension and balloon form according to different spindle speeds considering the dynamic behavior of the permanent magnet of the SMB system. To validate the model, the important relevant process parameters, such as the yarn tension, are measured at different regions of the yarn path, and the balloon forms are recorded during spinning with the SMB system using a high speed camera.

An experimental investigation of yarn tension in simulated ring spinning

2004 ◽  
Vol 5 (4) ◽  
pp. 275-279 ◽  
Author(s):  
Zheng-Xue Tang ◽  
Xungai Wang ◽  
W. Barrie Fraser ◽  
Lijing Wang
Keyword(s):  
Experimental Investigation ◽  
Ring Spinning ◽  
Yarn Tension

Recent Studies on Yarn Tension and Energy Consumption in Ring Spinning

2005 ◽  
Vol 9 (4) ◽  
pp. 1-15 ◽  
Author(s):  
Zhengxue Tang ◽  
Xungai Wang ◽  
W. Barrie Fraser
Keyword(s):  
Energy Consumption ◽  
Ring Spinning ◽  
Yarn Tension

Air and Ring Combination in Tandem Spinning

1997 ◽  
Vol 67 (3) ◽  
pp. 217-223 ◽  
Author(s):  
A. P. S. Sawhney ◽  
L. B. Kimmel
Keyword(s):  
Spindle Speed ◽  
Optimum Level ◽  
Ring Spinning ◽  
Air Jet ◽  
Yarn Twist ◽  
Spun Yarn ◽  
Spun Yarns ◽  
Ring Spun Yarn ◽  
Twist Level ◽  
Air Nozzle

With the objective of boosting ring spinning productivity, a new tandem spinning system combining air-jet and ring spinning technologies in continuous tandem is investigated. In this “air-plus-ring” tandem spinning system, a drafted roving strand as it emerges from the front roller nip feeds into a single- or dual-jet air nozzle where it is subjected to a vortex of compressed air, producing a pneumatically entangled, false-twisted, partially strengthened strand. This so-called prefabricated, air-bolstered strand continuously feeds into a standard ring spinning zone and is ultimately spun into a novel, single-component yarn. By spinning a few cotton and cotton-blend yarns with the lowest practical twist levels possible on both the tandem and conventional ring spinning systems, we show that a tandem spun yarn can be produced with a relatively lower (true ring) twist level than a pure ring spun yarn. To an extent, the tandem spinning's air-bolstering action reinforces the drafted fibrous strand, contributing to yarn formation and hence character. Since ring spinning productivity is inversely proportional to yarn twist level, the relatively lower twist level required in tandem spinning allows a proportionately higher yarn production speed (in some cases, up to 50% faster than the conventional ring spinning), while maintaining spindle speed at the traditional, optimum level imposed by the limiting traveler speed. Tandem spun yarns, however, are somewhat different from, and generally weaker than, conventional ring spun yarns. This paper briefly describes a prototype of the new tandem spinning system developed on a laboratory Spintester, and shows spinning parameters and properties of a few yarns produced on both the tandem arid conventional ring spinning systems, each employing the traditional (maximum) optimum spindle speed of 10,000 rpm for a given 5.0 cm (2 inch) diameter ring.

A Study of the Vibrational Dynamics of an Endrill Clamped by Side-Locking

1993 ◽  
Vol 115 (4) ◽  
pp. 438-443 ◽  
Author(s):  
M. Rahman ◽  
M. A. Matin ◽  
K. H. W. Seah
Keyword(s):  
Fourier Analysis ◽  
Frequency Response ◽  
Centrifugal Force ◽  
Spindle Speed ◽  
Drill Bit ◽  
Vibrational Dynamics ◽  
Stability Chart ◽  
Harmonic Variation ◽  
Oval Shape

An endrill is clamped by a side-locking device. The shape of a hole obtained by such a drill is found to be of a distorted oval shape. Fourier analysis of the process reveals that the out-of-roundness of the hole is due to the harmonic variation of the centrifugal force developed on the drill-bit. The chattering ranges of the spindle speed are also shown in a stability chart representing the frequency response of the system.

A Design for Spinning Tension Control

1985 ◽  
Vol 107 (2) ◽  
pp. 220-227 ◽  
Author(s):  
R. A. Taylor ◽  
R. S. Brown
Keyword(s):  
Unique Feature ◽  
Tension Control ◽  
Ring Spinning ◽  
Yarn Tension ◽  
High Speeds

A new cap-spinning design is described. A unique feature enables the cap to be operated at different speeds from the bobbin to increase or decrease yarn tension as needed. The new spinner will operate as a modification on a conventional ring spinning frame. However, it eliminates the need for rings and travelers. Due to the spinners independent tension control, it can be operated at extremely high speeds without increasing the ends down rate. Yarn grade and tension comparisons with a ring spinning are reported.

Investigation of Movable Balloon Controller System on a Ring Spinning Frame

2011 ◽  
Vol 175-176 ◽  
pp. 474-479
Author(s):  
Ju Sheng Qiu ◽  
Zhi Li Zhong ◽  
Huan Guo ◽  
Xun Gai Wang
Keyword(s):  
Displacement Sensor ◽  
Step Motor ◽  
Ring Spinning ◽  
Yarn Tension ◽  
Spun Yarns ◽  
The Status ◽  
Spinning Process ◽  
Linear Module ◽  
High Power Consumption

Compared to other spinning system, the ring spinning process has been used to produce higher quality yarns, but with a much lower spinning efficiency, resulted from the relatively high spinning tension that leads to increased yarn breakage rates and makes high power consumption. Thus, depressing yarn tension is essential to change the status. In this paper, we design a movable balloon controller system to reduce yarn tension. The system is automatic, composed of powder switch, touch screen, PLC (Programmable Logic Controller), pulling-thread displacement sensor, controller of step motor, step motor and linear module. PLC, the core of the system, controls the position of the balloon controller by a series of programs. Then yarn tension was tested while spinning with movable balloon control ring, fixed balloon control ring and no balloon control ring, respectively. The result shows that the yarn tension can be depressed indeed by equipping this movable balloon controller system to some extent. Additionally, we find that the number of hairiness of ring spun yarns with this system can be reduced to some extent, while yarn tensile properties are not as sensitive to be worse. It is significant to cut down ends-down rate, improve the quality of ring spun yarns, the spinning efficiency as well as the energy efficiency of ring spinning.

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