Properties of Stitch

Properties of Stitch are described below:
  1. Stitch length: Stitch may be of longer or shorter. The higher the stitch length the more the strength of stitch.
  2. SPI: SPI means Stitch per Inch. It refers to stitch density.
a. High SPI: Thread density is high as results inter cohesional force between thread is increased. So, the strength of stitch is increased. But for this requires more thread consumption and more time. Another problem may arise is seam puckering due to high SPI.
b. Low SPI: Low SPI means low thread density. As a result inter cohesional force between thread is comparatively less. So, strength of stitch is comparatively low. The advantage of low SPI is less thread consumption, less time required.
  1. Thread tension: When stitch is formed there will be two tensions is generated. i.e.:
a. Tension between thread and needle: Too much thread tension causes seam puckering, high stitch uneven stitch, frequent thread breakage. As a result stitch quality is hampered.
b. Tension between thread and fabric: Too low thread tension causes loose or weak loop formation. As a result stitch may open due to loop opening or loop breakage.


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