Yarn is a general term for yarn and thread. In clothing materials science, yarn refers to many short fibers or filaments arranged in an approximately parallel state, and rotated and twisted along the axis to form a thin fiber with a certain strength and linear density. A long object; and a thread refers to a strand made of two or more single yarns twisted together.
Made from textile fibers It is a thin and soft continuous strip with a certain thickness and physical and mechanical properties. Including yarn, thread and filament, etc. Such as: sewing thread, knitting thread, embroidery thread, etc.
There are many types of yarn, and yarns can be classified according to different starting points.
Classification of yarn: Due to the different fiber raw materials and processing methods that make up the yarn, the shape and performance of the yarn are also different. It can be a pure spun yarn made of natural fibers or various chemical short fibers, a blended yarn made of several fibers, or a filament yarn made of direct spinning of chemical fibers. . Generally, yarns can be classified according to the raw materials used, yarn thickness, spinning method, spinning system, yarn knot structure and yarn usage.
Due to the different fibers and processing methods that make up the yarn, there are many types of yarns with different shapes. There are also many classification methods.
(1) According to the raw materials of yarn
1. Purely spun yarn
Consists of a kind of fiber raw material, such as: pure cotton yarn, pure wool, pure silk, pure linen, pure fiber yarn.
2. Cotton and linen blended yarn
A yarn spun by mixing two or more fibers. Such as polyester cotton, polyester linen, wool viscose yarn.
(2) According to the fiber state in the yarn
1. Short fiber yarn:
Yarn made of twisted short fibers. Usually 15 to 100 short fibers are twisted to form a single yarn, and 2 or more single yarns are combined and twisted to form a thread.
Short yarns generally have a loose structure and a plump feel. Most sewing threads, Korean knitting yarns and woolen yarns are short fibers.
2. Filament yarn
Yarns processed from filaments spun directly from polymer solutions are classified according to their structure. There are three types: monofilament, multifilament, and composite twisted yarn. Monofilament is composed of one long filament and is used to weave socks, pantyhose, headscarves, swimwear, etc.; multifilament is composed of several monofilaments. There are many silk fabrics made of multifilament, such as plain satin, etc., which are used for suits. Linings, underwear, etc.; composite twisted yarn is made of multifilament yarns that are twisted, and different twists are used according to the purpose to weave crepe fabrics.
Filament yarn has good strength and uniformity, can be made into very fine yarn, has poor hygroscopicity, is prone to static electricity, and feels smooth, flat and cool.
3. Reeling (Sao) silk: raw silk reeled from silkworm cocoons.
4. Split yarn: Polypropylene film sheets are split into required widths by cutting or scribing techniques, and then stretched to make split yarn, used for carpets and piles. Fabric base fabric, woven packaging bags.
(3) According to the dyeing, finishing and post-processing of yarn
1. Mercerized yarn: cotton yarn is treated with sodium hydroxide and Adding tension changes the luster intensity of the yarn.
2. Singing yarn: Use burning gas or electric heat to burn off the hair on the surface of the yarn to make the yarn smoother.
3. Natural color yarn: original color yarn, which maintains the original color of the fiber without bleaching.
4. Dyeing yarn: The original color yarn is boiled and dyed to make colored yarn.
5. Bleached yarn: yarn made by boiling and bleaching the original color yarn.
(4) According to spinning technology
1. Combed cotton yarn and carded cotton yarn
Combed cotton yarn refers to cotton yarn that has been combed on the basis of ordinary carding of cotton fibers in the spinning system.
Due to the removal of short fibers and impurities and repeated carding, the fibers in the yarn are parallel and straight, the sliver is even and smooth, and its appearance and performance are better than carded cotton yarn. Spinning high-end poplin, sweatshirts, etc.
2. Combed wool yarn and carded wool yarn
The fibers used in combed wool yarn are finer, longer and uniform with high quality. Wool is used as raw material and is made according to the worsted wool spinning process. The fibers in the yarn are parallel and straight, and the sliver is even and smooth. It is used for worsted wool fabrics such as gabardine, Validin, and Palis.
Carded wool yarn is processed into wool yarn using a woolen wool spinning system with shorter processing steps. The fiber length is uneven, the fiber is not straight enough, the structure is scattered, and the surface is hairy. It is used for Coats, flannels and rugs.
The structure and properties of the yarn directly affect the properties of the fabric and the wearing performance of the garment, such as the surface gloss, smoothness, roughness or fleece of the fabric, the weight of the fabric, the texture of the fabric (fullness, softness , stiffness, elasticity, etc.), clothing wear resistance, pilling, etc.
