Yarn Production : theoretical aspects / P. Grosberg & C.Lype

CONTENTS

1. Outline of the technology of yarn production

1.1 Introduction
1.2 Fibre properties and sources
1.3 Impurities present in cotton and wool
1.4 Modern yarn production
etc

2. The forces acting on fibre and yarns

2.1 Introduction
2.2 Air Drag on fibres and yarns
2.3 The straitening of individual fibres by means of air-drag forces
2.4 Magnitude of Electrostatic forces on fibres

3. Drafting theory: part 1- The determination of drafting forces

3.1 Introduction
3.2 Forces between fibres: Contact pressure
3.3 The forces needed to remove a fibre from a Silver
3.4 Relationship between load and Compression of a Sliver

4. Drafting Theory: part 2 - The Irregularity of Random and perfectly Drafted Silvers

4.1 Introduction
4.2 Irregularity properties of the Random Silver
4.3 Medium- and long term Irregularity of ''real'' Silvers
4.4 The effect of open-loop control on the output variance-length
etc

5. Drafting theory : Part 3- Imperfect drafting

5.1 Causes of non-perfect drafting
5.2 Fibres Moving out of turn
5.3 Movement of fibres in groups
5.4 Irregularity produced by deformation of whole Sliver
etc

6. Blending of fibres

6.1 Introduction
6.2 Blending by doubling and Drafting
6.3 Blending on the card
6.4 Requirements of batch- blending
etc

7. Balloon theory -Part 1 : Approximate Solution

7.1 Introduction
7.2 The tied Balloon in a Vacuum
7.3 Modification of tied- balloon Solution to allow for air drag
7.4 The complete geometry
etc

8. Balloon Theory- part 2: The Application of the Approximate theory to Conventional Spinning

8.1 Introduction
8.2 Ring spinning
8.3 The application of Balloon theory to Cap spinning Appendix Chapter 8

9. Balloon Theory -part 3: Exact solution with applications to winding and Unconventional spinning

9.1 Introduction
9.2 Exact solution to the problem of a rotating Thread
9.3 Application of balloon theory to unwinding from packages
etc

10. Tension changes along a threading

10.1 Introduction
10.2 Tension in a yarn between two positively driven rollers
10.3 The effect of air Drag on running-yarn tension
etc

11. Twist Changes along a Threading

11.1 Introduction
11.2 Twist changes along a yarn between a positive-feed Roller and a positive twist-insertion device
11.3 Dynamic False-twist Changes in a false-twist system
11.4 Application to self-twist Spinning
etc

Subject index : p. 206-210