Saturday, 18 April 2009
Neither natural or manmade fibres are optimally suited to certain fields of use, but a blend of these two fibres types can give the required characteristics.
1. Improvement in Functional Properties
A 100% single fibre yarn cannot impart all the desired properties to a fabric.
For example 100% viscose rayon suffer from low tensile strength, poor crease resistance and low abrasion resistance.
Similarly 100% polyester fabrics are not desirable as they are prone to static accumulation, hole melting and pilling. They are moisture resistant, difficult and expensive to dye and have a poor hand.
These negative attributes of polyester and viscose can be reasonably neutralised by addition of a certain percentage of each fibre.
2. Improved Process performance
Some fibres like polyester at times are quite troublesome to work in 100% form especially at cards. Addition of fibres like cotton or viscose rayon in the previous process has been seen to facilitate the smooth carding of such fibres.
The blending of manmades which are longer and finer to cotton which is shorter influences the spinnablility as well as productivity.
The price of manmades is much more stable than that of natural fibres like cotton. Price stability can enable the mills to pursue optimisation of their fibre purchase programme.
Blending could also be used for reducing the mixing cost. For example, a fibre like viscose can be blended with cotton for producing specific yarns with reduced raw material costs.
4. Fancy Effect
Fibres with a variety of colour mixture or shades can be produced by blending different dyed fibres at the blowroom, drawframe or roving stage.
The aesthetics of a fabric can be developed by selecting specific blend components and their properties.