Process of Warp Knitting Process

Traditional textile industry process includes four parts: fiber, weaving, finishing and clothing. Initially, textiles were mainly used for clothing, then extended to the decorative field, and then extended to other industrial fields, forming three major application areas of clothing, decoration and industry. So what is the warp knitting process?

Understanding the warp knitting process

The warp knitting process is a process in textiles, also known as knitting. Knitting is a method of forming fabric, and the fabric formed by it is called knitted fabric. Knitted fabric is formed by loops interlocking with each other. According to the direction of the loops formed by the yarn in the fabric, the knitted fabric can be divided into warp knitted fabric and weft knitted fabric. The names of warp and weft knitting come from machine weaving. Machine weaving is the oldest textile process, and the machine-woven fabric is woven by the vertical warp yarn and the horizontal weft yarn. In warp knitted fabric, the same yarn forms a loop along the warp (vertical) direction of the fabric; in weft knitted fabric, the same yarn forms a loop along the weft (horizontal) direction of the fabric. To form weft knitted fabric, only one (or a few) yarn is needed, while to form warp knitted fabric, a group or several groups of yarn sheets are needed, and each group of yarn sheets consists of many yarns.

Understanding the process of the warp knitting process

Warp-knitted velvet fabrics can be divided into three types according to the method of forming the fluff: napped velvet, raschel velvet and cut velvet. The napped velvet is produced on a general high-speed warp knitting machine. The fluff effect of these fabrics is caused by pulling the long extending yarn to raise the fluff. Raschel velvet is produced on a double-needle bed raschel warp knitting machine. The fluff effect of these fabrics is achieved by dividing the double-layer fluffy fabric into two separate fluffy fabrics. This type of fabric has been developed extensively in China, with products such as plain velvet, printed velvet, brushed flower velvet, etc. Cut velvet is produced on a high-speed warp knitting machine with a pile loop settling piece, and the fluff of these fabrics is formed by cutting off the top of the pile loop. According to the performance of the fabric, this type of product can be divided into two categories: non-elastic and elastic. Non-elastic warp-knitted velvet is used for automobile interior decoration, furniture covering fabrics, curtains, shoe fabrics, baby toys, etc., while elastic warp-knitted velvet can be used for swimwear, sportswear, underwear and fashion outerwear. Because the cut velvet has finer and more flexible fluff than the raschel short velvet machine, this type of fabric has a wide range of applications and development prospects, especially elastic cut velvet. Therefore, this article focuses on the production process of elastic cut warp-knitted velvet.

The warp knitting process

Raw materials→warping→weaving→dyeing→sizing+shearing→inspection→packaging + finished products. In most countries, warp-knitted cut velvet uses colored yarn weaving as much as possible to avoid weaving with white yarn and then dyeing, because the fluff after cutting will be pressed down during dyeing, and the sizing will also be difficult to recover, thus not obtaining even velvet. If dyeing is carried out before shearing, the fluff loops will be pressed down during dyeing, and the shearing cannot be uniform, resulting in uneven velvet. In addition, using colored yarn weaving simplifies finishing, and only dry finishing is needed, avoiding a series of problems such as sewage treatment.