Yarn Twisting Dynamics

Yarn Twisting Dynamics presents the general differential equations of yarn twisting dynamics, describing rotational kinematics and kinetics, along with the twist blocking mechanisms of traveling yarns in straight and spatial paths. General solutions to yarn twisting dynamic equations, including twist wave propagation and twist distributions in idealized systems are also presented. Yarn tensile, torsional, and compressional properties are discussed based on yarn helical structure models. Users will find this book to be a first principles approach to yarn twisting problems in yarn manufacturing and handling systems.

Other sections cover yarn twisting dynamics and twist blockage theories, including conventional ring spinning, modified ring spinning, additive spinning (i. e. , open-end spinning), constant and periodic false-twisting, rub-condensing (i. e. , roving and slubbing production), false twist texturing, and carbon nanotube yarn production systems.

Part I. Theory
1. Introduction to twist and twist insertion systems
2. Yarn structure and properties
3. General equations of yarn twisting dynamics
4. Solutions of yarn twisting dynamic equations in simplified systems
5. Twist propagation equation
6. Mechanics of yarn twist blockage

Part II. Applications
7. Conventional ring spinning
8. Modified ring spinning systems
9. Rotor spinning
10. Friction spinning
11. Fascinated yarns (air jet, vortex, and hollow spindle wrap spinning systems)
12. Self-twist yarns
13. Twist insertion in carbon nanotube (CNT) yarn production
14. False-twist texturing
15. Consolidation of fibre bundles by rubbing action
16. False-twist spiral
17. Artificial muscles based on highly-twisted yarns