Engineering Fundamentals of Ring Spinning/Twisting, Over-end Unwinding and Two-for-One Twisting in Textile Processes

*A book in the Engineering With Fibers series

Subhash Batra, Ph.D., North Carolina State University
W. Barrie Fraser, Ph.D.,University of Sydney

Foreword by Frederick H. Abernathy, Harvard University

978-1-60595-172-0, ©2015, 186 pages, 6×9, Hardcover book

  • Essential theory for understanding and modifying dynamic elements of high-speed yarn spinning, unwinding and twisting
  • Troubleshoot and correct problems in fibers and machinery caused by very rapid throughput

Using basic physics and engineering principles, this volume analyzes dynamic forces in three processes critical for textile production: O-ring spinning, unwinding and twisting. The book offers a review of approaches for modeling the processes and discusses the advantages and disadvantages of each. Detailed analyses are given for the dynamics of ballooning yarns, instabilities due to acceleration, and the many interacting parameters that affect tension. The theory presented is linked to practical questions such as how to prevent broken yarns and reduce equipment downtime with an emphasis on ways to improve process design and achieve higher throughput. This technical book furnishes the calculations needed to understand and optimize a number of textile production processes, including texturing and warping.
This volume is the latest in the Engineering With Fibers series, edited by B. Pourdeyhimi, S. Batra and M. Jaffe.

Foreword
Preface
Acknowledgments
Nomenclature

Chapter 1. Description of Processes Analyzed
1.1. Introduction
1.2. Ring Spinning
1.3. Cap Spinning
1.4. Over-end Unwinding
1.5. Plied Yarns
1.6. Two-for-One Twisting
1.7. Appendix 1: A Brief Look at the Short-staple Yarn Manufacturing System
1.8. Appendix 2: Global Capacity of Ring-spinning Spindles versus Open-end-spinning Spindles
1.9. Appendix 3: The Flyer Action

Chapter 2. Review of Previous Investigations
2.1. Introduction
2.2. Epoch 1 (1880–1950)
2.3. Epoch 2 (1950–1977)
2.4. Epoch 3 (1978 to the Present)

Chapter 3. Equations of Motion for the Balloon
3.1. Introduction
3.2. The Equations of Motion
3.3. Nondimensionalization and Dimensional Analysis
3.4. Solving the Stationary Balloon Equations
3.5. Experimental Validation of the Elastic Yarn Model
3.6. Stability Analysis of the Stationary Balloons
3.7. Appendix A: Air Drag on a Translating and Whirling Yarn

Chapter 4. Ring Spinning: Analytical Model
4.1. Introduction
4.2. Ring Spinning: The Free Balloon Model
4.3. Balloon Control Ring
4.4. Other Influences
4.5. Concluding Remarks

Chapter 5. The Effect of Twist in a Ballooning Yarn
5.1. Introduction
5.2. Mathematical Formulation
5.3. Conclusion

Chapter 6. Over-End Unwinding: Cylindrical Package
6.1. Introduction
6.2. Equations of Motion: End Regions Excluded
6.3. Nondimensionalization of the Equations
6.4. Concluding Remarks
6.5. Appendix-—Kinematics of the Unwind Point a’ la Padfield

Chapter 7. The Two-for-One Twister
7.1. Introduction
7.2. The Equations of Motion (EoM) of the Yarn in the Balloon
7.3. EoM of Yarn in Contact with the Control Cylinder
7.4. Conclusions

Index
In Memorium: W. Barrie Fraser
In Memorium: Mishu I. Zeidman

Foreword by Frederick H. Abernathy, Harvard University

978-1-60595-172-0, ©2015, 186 pages, 6×9, Hardcover book

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