Study On The Construction And Properties Of Soybean Knitted Fabric

Soybean fiber is a new type of fiber developed and first put into mass production by Chinese specialists. Study on properties of soybean fiber and fabric is at the beginning, because it is short time from development to production. Therefore, the experimental and theoretic study on the construction and properties of soybean fiber and fabric is conducted in order to derive some information for soybean fabric production, which is important and valuable to perfect producing technology and promote industry progress of large-scale manufacture of soybean fabric.In this thesis, the dimensional property, stretching property, elastic property etc. are emphasized or taken as the focus points of research. The thesis is divided into five parts.The first chapter summarizes the research condition at home and abroad, and introduces some theory correlation to the dimension property, stretching property, elasticity of spandex fabric etc.In the second chapter, properties of soybean fiber are briefly introduced, and properties of soybean fiber yarn are tested. The same count cotton yarn is chosen as a contrast to test the yarn property. Through testing, some properties of soybean fiber yarn are found better than the ones of cotton yarn.Study on the dimensional stability of soybean fabric in the third chapter also chooses cotton fabric as a contrast. It is divided into three parts: dry relaxation, wet relaxation, or an aspect of heat-setting technology. Among these parts wet relaxation is emphasized. During research fabric dimension is found to be reduced after dry relaxation, and to continue to be reduced after wet relaxation. Fabric dimension kept stability after fabric was washed five times. At this moment the completed relaxation isreached, being close to minimum energy condition. Through examination of photos of soybean fabric on the dry relaxation condition compared with one at wet relaxation condition, shape of loop was found to have an apparent change. By analyzing loop model on the dry relaxation and wet relaxation condition, the reduced percentage of fabric dimension was found to have some relation to height of wale and course space of the dry and wet relaxation conditions or the dimension of yarn, but having nothing with other factors. One linear relation exists between fabric tightness factor K or loop length factor l/l2 and the total density on the completed relaxation condition. Through study on wet relaxation after heat setting, which is found to be a necessary method to improve fabric dimensional stability.In the fourth chapter not only for soybean fabric but also cotton fabric one linear relation was found to exist between height of wale and course space during study on fabric stretching property. And it was verified by means of the linear regression method. But the slope is changed with the numerical value on the balance condition. When the deviation which exits from the stretching condition to the balance condition is obtained, then the fabric shrink trend can be predicted.The fifth chapter briefly introduces the knit technology of elastic soybean knitted fabric, and study on elasticity is emphasized. During research elasticity of elastic soybean knitted fabric is found to be better than one of elastic cotton fabric; The elasticity in course direction is better than one in wale direction for double directional elastic fabric; the more percentage elastic yarn occupies, the better elasticity is about the same construction fabric; the larger dimension of non elastic yarn is, the worse elasticity is on the same condition.