[Common textile manual] Sewing thread

Overview

Refers to multi-strand wires used in sewing machines or hand-stitching textile materials, plastic leather products, and sewing books. The sewing thread must have seamability, durability, and appearance quality. It is usually required to have high strength, uniform evenness, moderate twist, small knots, soft lubrication, and good elasticity, so as to adapt to high-speed sewing of garments and sewing of shoes, caps, awnings, and leather.

Variety

There are many types of sewing threads, divided by raw materials: natural fiber type (cotton thread, twine, silk thread, etc.) and mixed type (polyester thread, nylon thread, etc.). According to the package form, there are: stranded, wooden yarn, paper core, cardboard, etc. General civilian or industrial use two. The civilian sewing thread is mainly packaged in small packages with a length of 50-1000m. Industrial sewing threads are mostly large packages with lengths of 1000-11000m and tens of thousands of meters.

specification

The single thread used for sewing thread is generally 7.3~64.8tex (9~80 English). The number of shares is 2 shares, 3 shares, 4 shares, 6 shares and 9 shares, with a maximum of 12 shares. Based on the circumscribed circle of the squall line, under normal circumstances, the fiber plumpness within the circle is 0.5 for the two strands, 0.65 for the three strands, 0.69 for the four strands, and 0.78 for the six strands. The more strands, the more substantial The higher. However, the increase in the enrichment of more than 3 shares is not fast. In view of economy and rationality, commonly used sewing threads use three-ply structures. The stability of the 2 strands is poor, and the strength is not enough. The 2 ply stocks are used for light and thin fabrics, and the 4 ply stocks are used in the non-textile industries such as leather, shoes, sailing sails, books, and magazines. In order to adapt to the high-speed sewing of the sewing machine of the garment industry, it is necessary to try to reduce knots in the production, and a large package production process can be adopted. Strengthening the sewing thread after treatment lubrication is the key to improving the quality of the suture. The cotton thread is generally waxed, and the polyester thread and the nylon thread are often silicone oil emulsions. The commonly used treatment methods are contact method and impregnation method.