The strength of polyester staple fiber can be indicated by the certain strength of the fiber, which refers to the large load that the fiber can accept under the effect of successively adding load until it cracks. The legal lecturer unit is Newton (N) or centinewton (cN). In the past, it was used to express in grams or kilograms. Because fiber strength is related to fiber thickness, the strength of fibers of different thicknesses must be incomparable. Therefore, relative strength is often used to indicate fiber strength. Relative strength refers to the large tensile force that the fiber can accept per unit linear density (per tex or per denier). The legal unit of measurement is cattle/te (N/tex) or centi-N/te (cN/tex). It used to be expressed in grams/denier.
The elasticity of polyester staple fiber: In the processing and application of the fiber and its products, the effect of external force must be experienced and corresponding deformation occurs. When the effect of the external force is removed, part of the fiber deformation can be recovered, while the other part of the deformation will not recover. According to this characteristic of the fiber, the deformation of the fiber can be divided into three parts, that is, the part that can be recovered immediately after the external force is removed is called acute elastic deformation; when the external force is removed, the part of the deformation that can be slowly recovered is called slow Elastic deformation: When the external force is removed, the part of the deformation that cannot be recovered is called plastic deformation. The elasticity of the fiber refers to the healing ability of the fiber deformation. The common target that shows the elastic size of the fiber is the elastic recovery rate or rebound rate of the fiber. It refers to the percentage of rapid elastic deformation and slow elastic deformation at a certain moment in total deformation. The elastic recovery rate of the fiber is high, the elasticity of the fiber is good, and the ability of deformation recovery is strong. Textiles made of elastic fibers have good dimensional stability, are not easy to wrinkle during the wearing process, and are more wear-resistant. For example, polyester has excellent elasticity, and the garments made from it have the characteristics of stiffness and wear resistance.
Abrasion resistance of polyester staple fiber: In the process of processing and practical application of the fiber and its products, it is caused by constant friction and wear. The wear resistance of the fiber refers to the function of the fiber to withstand external wear. The abrasion resistance of fibers is closely related to the fastness of textile products. The quality of abrasion resistance is an important goal of the function of wearing fabrics. The wear resistance of the fiber is related to the fiber's macromolecular structure, supramolecular structure, elongation at break, elasticity and other factors. The order of common fiber abrasion resistance is as follows:
Nylon>polypropylene>vinylon>polyethylene>polyester>acrylic>chloride>wool>silk>cotton>linen>rich fiber>copper ammonia fiber>viscose fiber>acetate fiber>glass fiber.
The elastic modulus of polyester staple fiber: The elastic modulus of the fiber is also called "initial modulus", which refers to the stress-strain ratio of the straight line at the beginning of the fiber stretch curve. In practice calculation, generally the point on the load-elongation curve when the elongation is 1% can be used to obtain the elastic modulus of the fiber. The size of the fiber elastic modulus indicates the degree of difficulty of the fiber under the effect of small load, it reflects the rigidity of the fiber, and is closely related to the function of the fabric. When other conditions are combined, the elastic modulus of the fiber is large, the fabric is stiff; conversely, the elastic modulus is small, and the fabric is soft.
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