Knitting can be divided into warp knitting and weft knitting.
Warp knitting uses multiple yarns to make loops along the longitudinal (warp) direction of the fabric simultaneously.
Weft knitting uses one or more yarns to form a loop in sequence along the transverse (weft) of the section.

Weft knitted goods can be formed with at least one yarn, but in order to improve production efficiency, it is generally used to weave multiple yarns; Warp knitted fabrics cannot be formed with a single yarn, a yarn can only form a chain of coils. All weft knitted fabrics can be broken into threads against the knitting direction, but warp knitted fabrics can not. Warp knitted fabrics cannot be woven by hand.

Warp knitted fabrics are divided into two categories: one is Raschel fabric, the main characteristics are large flower shape, rough cloth, more holes, mainly to do decorative fabrics.The second is tricol fabric, fine cloth, less color, but high output, mainly made of covered fabrics and printed fabrics, such fabrics are mostly used for chemical fiber filament, otherwise the production efficiency is very low..