Reason for SPIRALITY-
- Yarn twist multiple play the big role on spirality- angle of spirality decrease only when the twist multiple decreases
- Tightness of knitting construction
- The number of feeder in a circular knitting machine also influence the angle of spirality.
To prevent the Spirality, following points should be followed up-
- Tight knitting is very important
- The tightness factor should be 14 to 16 for Jersey fabric
- Twist per inch (TPI) should be 19.2 at the spining stage itself
- The value of twist multiple of the yarn should not be more than 3.2 (formula- TM= TPI / square root of count of yarn)
- The loop shape factor should be 1.3 considerable
- Proper texture & guage must be maintained
- Grain lines must maintain straight
- During knitting, one to three needles should be dropped to get straightline of the fabric
- Relaxing of fabric should be made minimum of 12 hrs before cutting is started.
- Feeding S-twist & Z-twist yarns in alternate courses reduces the spirality
- Conditioning of Yarn before knitting in the steam....it reduces the snarling tendency of the yarn