Knitting industry is an important part of textile industry. Knitting is a technological process that uses knitting needles to form coils of various raw materials and varieties of yarns, and then connect them into knitted fabrics through string sleeves. Knitted clothing is widely recognized by people for its soft, comfortable and elastic properties. Especially in recent years, with the application of new materials, new processes and new technologies, knitted fabrics are richer and better in performance.
Underwear, sportswear, socks, gloves, sweaters and other clothing made of knitted fabrics have good extensibility, thermal insulation, moisture absorption and air permeability, which makes the demand of consumers increase rapidly. In addition to clothing and decoration, knitted products can also be used in industry and agriculture, medical and health care, national defense and other fields.
In recent years, China’s knitting industry has shown a rapid development speed. Knitting technology and related equipment are developing in the direction of high efficiency, energy saving, environmental protection and electronic control. Knitting products are showing a diversified, high-grade and functional development trend.
In the international market, with the competitive advantage of high quality and low price, China’s low-grade knitwear exports have been growing, with an average annual growth rate of more than 20%, and several major export regions represented by Hong Kong, Japan, the European Union and the United States have been formed.
In short, knitted clothing occupies a more and more important position in modern life. “With the rapid development of social and economic level and the continuous improvement of people’s living standards, people have higher and higher requirements for clothing, not only for the fabric, style and color of products, but also for the sewing quality of products.
In the sewing process of knitted fabrics, needle holes often appear in the sewing process due to the damage of sewing needles and mechanical parts, or the working environment, or the knitted fabrics do not fully meet the process requirements in the previous processes. In particular, after oxygen bleaching of cotton fabric, part of the oil and wax in the cotton fiber is removed, which reduces the fiber lubricity and makes the fabric feel rough. Therefore, the cotton knitted fabric is more likely to form mechanical damage during sewing, that is, needle holes. The so-called needle holes refer to that during the sewing process, when the machine needle runs at high speed, it stabs the fabric coil yarn and breaks it, resulting in small holes around the stitch, When wearing (especially tight knit clothes), the knitted fabric coil has the characteristics of being pulled off and scattered. Under the action of external force, the needle hole is easy to expand, which reduces the reliability of the stitches of the products, and seriously affects the appearance quality.
Facing today’s fierce market competition, only by continuously improving the quality of their products can they win customers. Therefore, the research on avoiding or reducing sewing needle holes has practical and economic significance
