Causes & Preventive key points

Yarn Hairiness effect on Fabric

GMT 16:53 2015 Tuesday ,01 December

Sriyadithatextile - Yarn Hairiness effect on Fabric

Mr. Ravichandra - GM - M/s. Aastha Spintex, Gujarat
TFA

 

In this special interview, Mr. Ravichandra - GM of M/s. Aastha Spintex has shared some of the important key points for Cause & Preventive measures of yarn Hairiness & its effect on fabric.

Yarn Hairiness :

  • Fibres protruding out from the main body of the yarn is called Hairiness.
  • In Most circumstances it is an undesirable property, giving rise to problems in fabric production and also deteriorates the fabric appearance.
  • In Natural short staple fibre yarns, the reason behind being wide differences in fibre thickness, maturity and inadequatae spinning process.
  • In Filament yarns, Hairiness occurs due to weak monofilaments, inadequate finish, rough surface, loose running monofilaments which break at subsequent process.
  • It is not possible to represent hairiness with a single parameter because the number of hairs, the length of hairs both vary independently.
  • A Yarn may have a small number of long hairs or a large number of short hairs or any combination in between. The problem is then which combination should be given a higher hairiness rating.
  • It is considered that there are two different exponential mechanisms in operation, ofe for hair above 3mm long and one for these below.
  • The number of hairs exceeding 3 mm in length as a percentage of the total number of hairs is found to be lineraly related to the linear density of the yarn, i.e., there are more hairs in a fine yarn than there are in a coarser one of the sample type.

Cause of Hairiness :

Maturity : In case of cotton 70% maturity of the fibres is needed, if less then cause hairiness. Immature and dead fibres result in hairiness.

Micronaire (Fineness): Range of Micronaire value for cotton yarn is  +/- 0.2. Micronaire value range of +/- 0.6 results in increased hairiness which is used in flannel like fabrics having soft feel.

Uniformity Ratio : Normally fibres uniformity ratio is 40 to 50%. If it is less, then results with high hairiness

Process :

  • Inadequate drafting and orientation
  • Spinning triangle

Maintenance :

  • Rubbery surfaces, life of devices (or) machinery parts

Significance of Hairiness :

  • It causes problems in printing
  • Fine design are difficult to make
  • Machine parts life is reduced

Adverse of Hairiness :

Yarn : Low Strength in yarns

Fabric :

  • Sizing : If yarn is fuzzy, size material will not penetrate to required amount and a greater amount will accumulate on yarn surface (coating is more and penetrating is less)
  • Shedding problems : In case of air jet, clear shed is not produce. Similarly if fabric density is more the two consecutive yarns due to hairiness causes problems.
  • Weaving : The machine parts, drop wires, heald wires and reed wear out.
  • Knitting : In Knitting , needles are worn out quickly.

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