The most serious problem in the process of sewing synthetic materials lies in the low heat resistance of the synthetic fibers. Their softening point is between 180°C and 230°C, and the melting point is between 230°C and 260°C. In high-speed sewing, the temperature of the needle reaches the melting point of the synthetic fiber soon, and then it begins to melt and adheres to the groove or eye of the needle. As a consequence, stitch skipping and thread breakage occur and naturally the sewing operation will stop. To cope with these troubles is as follows :

Damaged meshes of knitted fabrics by needle

  1. Choose the suitable needle, which can minimize the surface friction of the needle. In our products, we can recommended the SUPER-FINISHED NEEDLES specially made by coating phosphate and flour resin based materials on the needle surface.
  2. Decrease the needle temperature either by oiling the sewing material or sewing thread with a special lubricant or by using a lubricated sewing material or sewing threads for smoothness and radiation.
  3. Prevent the rise of the needle temperature by compulsory cooling with air blowing on the needle.
  4. Reduce the heat generated on the needle below the melting point of the synthetic fiber by lowering the revolutions of the sewing machine.
  5. Increase the heat-resistance of the sewing thread and sewing material to be used.