Analysis. The results show that there is a significant linear correlation between yarn twist and fabric tightness and fabric stiffness for the same fabric with the same material; for fabrics with different materials, the effect of the material itself should also be considered. With the improvement of living standards, people's requirements for the use of textiles have not only been limited to the durability, but more important to the comfort and aesthetics of the fabric, and have different requirements for fabrics for different purposes. Generally, clothing and fabrics for daily use and clothing, in addition to the pattern, color to meet consumer requirements, underwear fabrics need to have good soft characteristics, the outer fabric needs to maintain the necessary shape and aesthetics, should have a certain degree of rigidity and draping . The ability of a fabric to resist changes in its shape in the direction of its bend is known as bending stiffness. The bending stiffness is often used to evaluate the softness of the fabric, and also determines the drape aesthetics of the fabric. The fabric with high bending stiffness is quite cool. In addition, outdoor sports textiles (such as sleeping bags, tents, etc.) and industrial textiles (such as airbag fabrics or various conveyor belts) that are often folded, the bending properties of the fabric directly affect its durability and usability. At present, there are many methods for measuring and analyzing the bending stiffness of fabrics, such as: cantilever beam test method, Karl Finn method, simulated fabric style instrument method, definition method, ring method, Plate method and heart shape method. The test methods all have the disadvantages of complicated operation of the instrument or large test error, which makes it difficult to detect and analyze the bending performance of the fabric. There is the following relationship between the bending stiffness and the fabric stiffness (bending length): the basic similar 10 swatches, the LLY-01B computer controlled stiffness meter is used to measure the stiffness of the fabric, and the factors affecting the stiffness of the fabric are Test analysis aimed at finding the relationship between yarn twist and fabric tightness and fabric stiffness for fabric functional design. 1 Test 1.1 Test method The LLY-01B computer-controlled stiffness tester is used to measure the extension length of the sample, that is, the stiffness of the fabric. At the same time, there are many factors that affect the stiffness of the fabric. Ten kinds of fabrics are selected for testing. Among them, there are 6 kinds of pure cotton fabrics. In addition, polyester-cotton blends, wool-polyester blends and pure wool fabrics are selected for comparative analysis, respectively, for 10 fabric yarns. Line twist and fabric tightness were measured. 1.2 Test sample specification 10 kinds of fabrics are selected. The specifications are shown in Table 1. Table 1 Fabric sample specification No. Raw material composition /% warp / root weft density / '* warp weft yarn 1.3 test instrument LLY-01B computer control stiffness meter , GQ70E infrared fast dryer, PB203N electronic balance, Y331 type oximeter, general biological microscope. 1.4 Fabric index test yarn twist test. Ten fabrics were measured on a crepe meter for 10 times, and then averaged. Fabric tightness test. The yarn straight fabric stiffness test was measured under a microscope. Each sample of the specification of 20 cm x 2.5 cm was measured on the LLY-01B type computer controlled stiffness meter for the sample slip length L, that is, the fabric stiffness. The above measurement results are shown in Table 2. Table 2 Sample Index Test No. Tightness E/% 2 Test Results Analysis 21 Fiber Materials The same fabric analysis ~6 cotton fabric, regression analysis analysis of yarn twist and fabric tightness on fabric stiffening Degree of influence. The effect of yarn twist on the stiffness of the fabric. The fabric tightness was maintained at 60%~98%, and the influence of yarn twist on the stiffness of the fabric was analyzed. The regression equation was as follows: Variance analysis is shown in Table 3. Under the condition of significance level a=0.10, due to F>F ). 90 (1, 4) = 4.54, so there is a significant one-way linear relationship between yarn twist and fiber diameter. When the yarn twist is added, the cohesion between the fibers is added, thereby increasing the stiffness of the fabric. Table 3 Variance Analysis Table Variance Sources Squared and Degrees of Freedom The effect of mean square fabric tightness on fabric stiffness. The yarn twist was maintained at 90æ»/10cm~130æ»/10cm, and the influence of fabric tightness on the stiffness of the fabric was analyzed. The regression equation was obtained as follows: Y=variance analysis is shown in Table 4. At the level of significance a= stiff with the fabric There is a significant linear relationship between degrees. Table 4 Variance analysis table variance source squared and degree of freedom mean square (3) the effect of yarn twist and fabric tightness on the stiffness of the fabric. The above analysis is influenced by a single factor, but the discussion on the factors affecting the stiffness of the fabric tends to pay more attention to the comprehensive effects of various factors. Now combine the two factors (yarn twist, fabric tightness), and use the regression analysis method to get the empirical formula as follows: The analysis table of variance is shown in Table 5. Under the condition of significance level a = 010, since F>F). 90 (2,3) = 5.4, so there is a significant linear relationship between the yarn twist and the fabric tightness and the stiffness of the fabric. Table 5 Variance analysis table variance source squared and degree of freedom mean square 2.2 fiber raw material different fabric stiffness analysis For fabrics with different fiber raw materials, the fabric stiffness is not only affected by yarn twist and fabric tightness, but also with fiber stiffness And the feel is related. The polyester fiber contains a benzene ring and has a large rigidity. Therefore, the two samples of 7 and 8 are added with polyester fiber, and the stiffness of the fabric is obviously increased. Moreover, the content of polyester fibers in the 8 samples was higher than that of the 7 samples, and the stiffness of the fabric was also significantly higher than that of the 7 samples. Although the wool fiber is soft, the average fineness is thicker than cotton. Test results show that the relationship between diameter and bending stiffness is: By* bending stiffness; 8 yarn linear density; K* constant; * fabric tightness (%); due to bending stiffness and fiber diameter There is a linear relationship between the two, so the 9 and 10 wool fabrics, although the yarn twist and fabric tightness are less than 1 ~ 6 pure cotton fabric, but the stiffness of the fabric is still very high. 3 Conclusion There is a significant linear correlation between fabric stiffness and yarn twist and fabric tightness. The fiber raw material is pure cotton fabric. The empirical regression formula of fabric stiffness and yarn twist is 2.628+001X. The fiber raw material is pure cotton fabric. The empirical regression of fabric stiffness and fabric tightness is obtained through experiments. The formula is 2.129+00207X. The fiber raw material is pure cotton fabric, taking into account the influence of yarn twist and fabric tightness on the stiffness of the fabric. 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