Knowledge

1. When considering the strength of the needle itself, use a thinner needle as much as possible.

2. The puncture resistance of thick materials is large. In order to prevent needle breakage, thicker needles with strong stability should be selected, and thicker needles are not easy to puncture thicker sewing fibers.

3. The puncture resistance of thin materials is small. In order to prevent needle holes in the sewing material and affect the appearance of the sewing material, a thinner needle can be selected.

4. The needle should be smooth, without sharp rust spots, and the needle tip should be blunt appropriately to prevent damage to the sewing material fibers.

After the specification of the sewing needle is selected, the sewing thread is selected. The sutures include blunt cotton, polyester cotton, blended, polyester and rayon, etc., and are generally made of two, three, four, and six single yarns twisted together.

The direction of twisting can be divided into s twist and Z twist. Lockstitch machines generally use Z twist stitches, and good quality S twist threads can also be used on other sewing machines. Cotton sewing thread has good sewing performance,

However, the shrinkage during washing is larger than that of synthetic fibers, and its strength, chemical resistance and abrasion resistance are also worse than those of synthetic fibers. High-quality mercerized cotton threads are expensive.

Therefore, cotton sewing thread is rarely used now. The staple fiber polyester sewing thread has low cost, excellent sewing stability, durability and sewing performance, so it is suitable for all conventional garment sewing.

The sewing thread used in the overlock sewing machine is generally cotton thread, but due to the high cost of cotton fiber at present, polyester-cotton thread is generally used instead.

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