What is the material of the elastic band?

　　Shijiazhuang elastic band material is generally composed of rubber, polyester, glue, elastic fiber and so on. Synthetic rubbers generally used: cis-1,4-polyisoprene rubber, cis-1,4-polybutadiene rubber. According to the weaving method, different Shijiazhuang elastic bands can be divided into the following types:

　　1. Woven elastic band: made of cotton or chemical fiber for warp and weft, and a set of rubber yarn (latex or spandex) is interwoven according to certain rules.

　　Second, the knitting elastic band: woven by warp knitting weft method. The warp threads are tied into a chain under the action of a hook or a tongue, and the weft is lined in each chain, and the scattered chains are connected into a belt, the rubber yarn is covered by a chain, or two sets of wefts. Clamping. Knitted elastic bands can weave a variety of small patterns, color strips and crescent edges. The texture is loose and soft. Most of the raw materials are made of nylon elastic yarn. Most of the products are used in women's bras and underwear.

　　Third, the woven elastic band: also known as the ingot woven elastic band, the warp is woven by the "8"-shaped track around the rubber wire through the spindle. The belt pattern is herringbone, and the bandwidth is generally 0.3 to 2 cm. The texture is between the woven and knitted elastic bands. The color of the flowers is relatively monotonous and is mostly used for clothing.