SPIRALITY

SPIRALITY :  Spirality is defined as a distortion of a circular knitted fabric in which the wales follow a spiral path round the axis of the knitted fabric tube.

plain knitted fabrics made from single cotton yarn are most prone to spikrality.spirality does not occure in balanced structures like 1*1 rib interlock as the loop formed in opposite direction cancel out the distortion..⦽➤

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spirality

   

problems associated with the spirality some of the practical problems encountered in garments arising from the knitted fabric spirality

 >>>>> Displacement of seams often reffered to as twist in the cut ant sewn garments 

>>>>mismatch the pattern
>>>>sewing difficulties
  
   factors in fluencing spirality on fabric       

>the most prominient and fundamental factor contributing to the spirality in a knitted fabric (spirality is the residual torque of the yarn used ).

> if the twist level yarn is used for knitting the resultant loop  will no longer be symmetrical because of the inducced tortional starin in the yarn.

> the twisted yarn will have a tendency to untwist and release the torsional strain inside it in order to acquire the natural   configuration of a minimum energy state the yarn will attempt to rotate inside the fabric .thus,lifting one side of loop out of the surface  while otherside stays inside the fabric this distortion of loop symmetry gives rise to spirality  an inclination of loops like effect on the fabric .

  >the tightness factor for a knitted  fabric  indicates the relative loopness or tightness of a knitted lop in the space therefore it indirectly affects the fabric spirality by controlling the loop relation in the knitted structure . 

   controlling spirality                   

>spirality is minimised by the use doubled(two folded).

>spirality may be eliminated by knitted alternate ends of "s"  and "Z" twisted yarn of equal but opposite twist level.

>resin treatment is sometimes used to reduce the degree of distortion due to spirality.

>however the complete elimination of spirality in single jersey made from single yarn is virtually impossible ,one can only hope to reduce the  angle such as extent that the customer will be satisfied.

> spirality of more than 5-10 degree  is clearly visible  fabrics of around 10 degree spirality are commonly processed although acceptability varies with the quality ,price bracket and end use of particular goods.