Influence of Spinning Parameters on Vortex Spun Yarn Properties

From fibers to yarns

Yarns

Definition of Yarn

• • • • A yarn is a constructed assemblage of textile fibers which acts as a unit in fabric formation.

Classification:
Yarns may be:
• Staple or Filament • Single or Plied • Simple or Complex

In addition, Filament yarns may be:

* Types of Yarn
1. Staple (Short fibers) 2. Single or (One Strand)

or

3. Simple or (Same appearance along length) Filament (Continuous Filaments) Plied *Cord(Cabled) (Two or more strands, twisted) Complex

(Variable appearance along length)

Filament Yarns may be

• Flat or Texturized • A T-shirt would probably be knit from a SIMPLE, • • Fabric for a slip would probably be knit from a FLAT,

• Staple Fibers twisted together • Filament fibers laid side by side, with some twist applied • Single filament fiber • Strips made by lengthwise division of a sheet of material

Examples

The direction and amount of twist

• Twist in staple (spun) yarns is given in units of turns of twist per unit length, either turns per inch (U.S.) or turns per centimeter (Europe, Asia). • tpi= • • Yarn properties are affected by the degree of twist, but not by the direction (S or Z) of twist.

Effect of Twist on Staple Yarn Properties
• As twist increases, yarn strength and yarn stiffness increase up to a point, level off, then begin to fall at very high twist levels. • Yarns with extremely high levels of twist are called “crepe yarns”; these yarns possess a high degree of torque • • • Woven fabric containing these yarns have a pebbled surface texture.

Yarn Twist Staple Yarns
• Yarns with lower twist
– – – –

Harrier More comfortable skin contact Less cost

Crepe yarns, have a high tpi (turns per inch)

Low:

Moderate:

Crepe:

Continuous Filament Yarns
• Continuous filament yarns are assemblies of continuous filament fibers twisted together; each individual fiber runs through the entire length of yarn. • For flat (not texturized) • • • Texturizing •