Core Spun Yarn Knowledge
2. Introduction of Core Spun Yarn
Core-spun yarns are generally made of synthetic fiber filaments with good strength and elasticity as the core yarn, with short fibers such as cotton, wool, and viscose fibers being twisted together. The core-spun yarn has the excellent properties of filament core yarn and short-wrapped fiber. The more common core-spun yarn is polyester-cotton core-spun yarn, which uses polyester filament as the core yarn and wraps cotton fibers. There is also spandex core-spun yarn, which is a yarn made of spandex filament as the core yarn and other fibers as outer yarn. The knitted fabric or jeans material made of this core-spun yarn can stretch freely and fit comfortably when wearing.
At this stage, the core-spun yarn has developed into many types, which can be summarized as three types: short fiber and short fiber core-spun yarn, chemical filament and short fiber core-spun yarn, chemical filament and chemical filament core-spun yarn. At present, most core-spun yarns are generally composed of chemical fiber filaments as the core yarn and wrapped with various short fibers to form a unique structure of core-spun yarn. Commonly used chemical fiber filaments for its core yarns include polyester filaments, nylon filaments, and spandex filaments. The outer short fibers include cotton, polyester cotton, polyester, nylon, acrylic and wool fibers.
In addition to its special structure, core-spun yarn has many advantages. It can take advantage of the excellent physical properties of core yarn chemical fiber filaments and the performance and surface characteristics of short-coated short fibers to give full play to the characteristics of the two fibers and make up for their shortcomings. For example, polyester-cotton core-spun yarn can give full play to the advantages of polyester filaments that are crisp, crepe-resistant, easy to wash and dry, and at the same time, it can also take advantage of the advantages of outer cotton fiber that it has good moisture absorption, low static electricity, and is not easy to fuzz and pilling. The woven fabric is easy to dye and finish, comfortable to wear, easy to wash, bright in color, and beautiful in appearance. The core-spun yarn can also reduce the weight of the fabric while maintaining and improving the properties of the fabric. It also uses the different chemical properties of chemical fiber filaments and the outer fiber. During the dyeing and finishing of the fabric, a part of the outer fiber is rotten by chemicals to make it. Burnt-out fabric with three-dimensional pattern effect, etc. The use of core-spun yarn is currently the most widely used core-spun yarn with cotton as the skin and polyester as the core. It can be used to produce school uniforms, work clothes, shirts, bathrobe fabrics, skirt fabrics, sheets and decorative fabrics. In recent years, an important development of core-spun yarns is the use of polyester core spun yarns covered with viscose, viscose and linen or cotton and viscose blends, as well as cotton and silk or cotton and wool. Blended covered core-spun yarns, these products are very popular.
Its advantages are summarized as follows:
5. Core Spun Yarn Type
According to the different uses of core-spun yarns, the main types of core-spun yarns currently include: core-spun yarns for apparel fabrics, core-spun yarns for stretch fabrics, core-spun yarns for decorative fabrics, and core-spun yarns for sewing threads. There are also many spinning methods for core-spun yarn: ring spinning, electrostatic spinning, vortex spinning, self-twist spinning and so on. At present, my country's cotton spinning industry mostly uses cotton ring spinning to spin core-spun yarn.
the difference between core spun yarn and covered yarn
8. Raw material of Core Spun Yarn
8.1 Choice of core wire
The fineness of the core filament and the number of single filaments in it should be selected according to the use of the fabric and the spinning count. For core filaments of the same size, the thinner the filaments, the more the number of filaments, and the softer and smoother the fabric; on the contrary, the fewer the number of core filaments, the more rigid and stiff the fabric. For coated products, there is no need to consider the luster of the core wire, and the light core wire can be used to reduce production costs; if the exposed product is produced, the luster of the core wire should be considered. Effect. If producing 11.8tex (50s) polyester-cotton core-spun yarn for skirt materials and shirt fabrics, it is advisable to use ordinary low-strength and high-elongation 5.56tex(50D)/24F semi-gloss polyester filament as the core yarn. When core-spun yarn is used as sewing thread, generally select high-strength, low-elongation bright polyester filament with a large number of monofilaments above 7.78tex(70D)/36F. When used as burnt-out outerwear, bright polyester filaments below 7.56tex(68D)/36F can be used. But for the core-spun yarn used in burnt-out fabrics, the fineness of the core yarn should be too large. Generally, 7.22-8.33tex (65-75D)/36F matt or semi-gloss polyester filament is used to prevent burnt-out. Part is too thin, too thin and cause aurora. For the core-spun yarn used in elastic fabrics, the fineness of the core yarn can be selected according to the purpose of the fabric. Generally, polyester 7.78tex (70D) spandex yarn is used, and the draft ratio is about 3.8 times. For the medium (medium-low count) spandex core-spun yarn for warp-directed strong corduroy and stretch work cloth, the spandex yarn draft should be larger, about 3.8-4.0 times, which can ensure the wearing of stretch pants. At this time, the hips and knees have better resilience.
8.2 Choice of Outer Fiber
If cotton fiber is used as the outer fiber, theoretically, raw cotton with long length, high count and good maturity should be used as much as possible. But it should depend on the purpose of the product. If you are not making high-speed sewing threads, but making shirt fabrics or skirt materials, or other burnt-out decorative fabrics, you do not need to use good raw cotton, because they do not need to withstand high-speed sewing threads. The test of that kind of strong friction and high temperature melting will not produce "skinning" phenomenon, so 30mm long raw cotton can meet the requirements. However, the outer cotton used as the core-spun yarn of burnt-out fabrics has less neps and impurities. It is better if rayon is used as the outer fiber, with low strength, good dyeing performance and less neps and impurities.