Under the specified conditions, the ability of high-strength threads to form good stitches while maintaining certain mechanical properties is called sewability, which is a comprehensive index to evaluate the quality of sutures. According to the material, thickness, organization, color, sewing style, sewing equipment or means, the selection of sewing threads and needles matching the type and specification can generally follow the following principles:
1. Harmonize with fabric characteristics
It can ensure the unity of shrinkage, heat resistance, abrasion resistance, durability, etc., and avoid shrinkage caused by excessive differences in threads and fabrics. Generally, soft and thin materials are made with thin wires with small needles, and hard and thick materials are used with thick wires with large needles.
2. Coordinate with sewing equipment
The lockstitch sewing machine uses left-handed suture, which can be twisted during sewing to maintain the strength of the suture.
3. Coordinate with stitch form
The sewing machine is made of fine cotton thread, which is not easy to deform and wrinkle, and makes the chain stitch beautiful and comfortable. Double-stitches should be sutures with good extension. Strong stitches should be used for crotch seams and shoulder seams. Button eye stitches should be made of wear-resistant stitches.
4. Coordinate with the type of clothing
Special-purpose clothing, such as stretch clothing, requires elastic nylon thread, and firefighting clothing uses heat-resistant, flame-retardant and water-repellent high-strength threads.