Filter Cloth The nature of the fiber
The mechanical and mechanical properties of the filter cloth
1 . The tensile strength and elongation at break of the fabric
Fabric in the course of the use of a large tensile force, it will produce tensile fracture. The tensile force at breakage of the fabric is called the breaking strength; the percentage of deformation and the original length produced during the tensile fracture is called the elongation at break. The tensile fracture properties of the fabric are determined by the properties of the fiber, the structure of the yarn, the structure of the fabric, and the post-dyeing and finishing.
⑴ the nature of the fiber: the nature of the fabric is the determinant of tensile fracture properties. The breaking strength of the fiber is the maximum tensile force that can be sustained by the unit fineness of the fiber, in units of CN / dtex. In natural fibers, hemp fiber breaking strength is the highest, followed by silk and cotton, wool worst. Chemical fiber, the highest strength of nylon, and the first of all fiber, followed by polyester, polypropylene, vinylon, acrylic, polyvinyl chloride, rich fiber and viscose fiber. Among them, the viscose fiber strength is low, but slightly higher than the wool, in the wet state, its strong decline in many, almost wet strong only dry strong 40 ~ 50%. In addition to viscose fiber, wool, silk, vinylon, rich and strong fiber wet strength has declined, but cotton, hemp fiber exception, its wet strength not only did not decline but improved. Polyester, polypropylene, polyvinyl chloride, nylon, acrylic, etc. due to small moisture absorption, and its dry and wet strength is almost the same. As for the elongation at break, it is the smallest hemp fiber, only about 2%, followed by cotton, only 3 to 7%, silk 15 to 25%, while the wool is the first of natural fibers, up to 25 to 35%. Chemical fiber, to vinylon and viscose fiber elongation at break the lowest, about 25%, other synthetic fiber in more than 40%.
Therefore, the tensile properties of various types of textile fibers are different: cotton and linen are high-strength low-stretch type, wool is a low-strength high-stretch type, and nylon, polyester, acrylic and other high strength and high stretch, in addition, there are vinylon and Silk is a medium-strong extension. Generally thin and long fiber woven fabric than the coarse and short fiber fabric tensile properties.
⑵ yarn structure: Under normal circumstances, the more coarse yarn, the better the tensile properties; twist increase, is conducive to improved tensile properties; twist to the same configuration, the fabric strength has increased; In a single yarn fabric. ⑶ fabric structure: the same conditions in other conditions, the length of the yarn in a certain number of the more the number of crisp, the shorter the floating length, the greater the strength of the fabric and elongation at break. Therefore, the original organization to the plain tensile properties of the best, followed by twill, satin fabric the worst.
⑷ after dyeing and finishing: fabric finishing on the tensile properties of the impact, depending on the circumstances, advantages and disadvantages.
The tensile properties of the fabric can be expressed by breaking strength, elongation at break, breaking length, elongation at break and fracture. The international common latitude and longitude to the fracture and as the fabric of the toughness of the index.