Types of yarns:
All fibres need to be made into yarns before they are knitted/woven. Yarns are essentially long, continous strands made up of fibres twisted together.
Continous filament yarns: lightly twisting filament fibres together.
Staple yarns: short, staple fibres; they have to be carded/combed so the fibres lie in the same direction.
Blending: modern fabrics contain more that 1 fibre. Blending is achieved by spinning 2 or more fibres together. To make a successful blend, the fibres MUST be the same length.
Reasons for blending:
- reduce costs
- different effects
- easier to care for.
- poly-cotton; cancels out shrinkage; creasing and slow-drying. Also makes the fabric more absorbant. However it is dangerous when set alight.
- wool and nylon; softer, warmer, improves strength and resistance to abrasion, makes fabric lighter, prevents shrinkage + reduces costs!
Yarns and textures:
The characteristics of continous filament fibres can be changed by crimps, crinkles, snarls. The methods depend on the thermoplastic nature of the fibres.