Yarns are made of textile fibers with continuous mechanical properties, fineness and softness.
Usually the so-called "yarn" is actually a general term for "yarn" and "thread". It is generally defined as: yarn is a continuous linear object made of various textile fibers. It is fine and soft, and has the basic properties required for textile processing and final product use. In textiles, yarn and yarn are often defined separately, i.e. yarn is a product with a certain strength and linear density by arranging many staple fibers or filaments in an approximate line state and twisting them along the axis, while yarn is a product formed by twisting two or more single yarns, which is called yarn or strands.