Analysis. The results show that there is a significant linear correlation between yarn twist and fabric tightness and fabric stiffness for fabrics with the same fiber content. For fabrics with different fibers, the effect of the material properties must also be considered.
With the improvement of living standards, people's requirements for the use of textiles have been not only limited to wear resistance, but also pay more attention to the comfort and aesthetics of the fabric, and have different requirements for different uses of fabrics. General clothing and living woven fabrics and knitted fabrics, in addition to the pattern and color to meet consumer requirements, underwear fabrics need to have good softness characteristics, outerwear fabrics need to maintain the necessary shape and appearance, should have a certain degree of stiffness and sag . The ability of a fabric to resist changes in its bending direction is called bending stiffness. Bending stiffness is commonly used to evaluate the softness of fabrics, and also determines the aesthetic appearance of the fabrics. The fabrics with large bending stiffness are quite cool. In addition, the often folded outdoor sports textiles (such as sleeping bags, tents, etc.) and industrial textiles (such as airbag fabrics or various transmission belts, etc. that are subjected to air pressure), the bending properties of fabrics directly affect the durability and usability.
At present, there are many methods for measuring and analysing the bending stiffness of fabrics, including cantilever beam testing, Karlenian's method, analog fabric style instrument method, definition method, ring method, plate method, and cardioid method. The test methods have the disadvantages of complicated instrument operation or large test error, which makes it difficult to detect and analyze the bending performance of the fabric. The relationship between the bending stiffness and the stiffness of the fabric (bending length) is as follows: 10 similar swatches, using a LLY-01B computer-controlled stiffness meter to measure the stiffness of the fabric, and factors that affect the stiffness of the fabric Test analysis aims to find out the relationship between yarn twist and fabric tightness and fabric stiffness to provide functional design for fabrics.
1 Test 1.1 Test method The LLY-01B computer-controlled stiffness tester was used to measure the length of the specimen, that is, the stiffness of the fabric. At the same time, there are many factors that affect the stiffness of fabrics. Ten fabrics were selected for testing, including six types of pure cotton fabrics. In addition, polyester/cotton blends, wool/polyester blends, and pure wool fabrics were selected for comparative analysis. Line twist and fabric tightness were measured.
1.2 Test Sample Specifications Ten fabrics are selected for use in the text. Specifications are shown in Table 1. Table 1 Fabric Samples Specification No. Raw Material Composition/% Density/Weft Density/'* Warp Weft Yarn 1.3 Test Equipment LLY-01B Computer Controlled Stiffness Tester , GQ70E infrared fast dryer, PB203N electronic balance, Y331-type twist meter, ordinary biological microscope.
1.4 Fabric Index Test Yarn twist test. Ten yarns were measured ten times on a twist meter and then averaged.
Fabric tightness test. The yarn straight fabric stiffness test was measured under a microscope. Each sample with a size of 20 cm×2.5 cm was measured on a LLY-01B computer-controlled stiffness tester to measure the sample slide-out length L, ie, the stiffness of the fabric. The above measurement results are shown in Table 2. Table 2 Sample indexes Test number Tightness E/% 2 Test result analysis 21 Fabrics with the same fabric analysis~6 Pure cotton fabrics, analysis of yarn twist and fabric tightness versus fabric stiffness using regression analysis Degree of influence.
The effect of yarn twist on fabric stiffness. The fabric tightness was maintained at 60%~98% level, and the effect 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. Adding yarn twist increases the cohesion between the fibers and adds stiffness to the fabric.
Table 3 Variance Analysis Table Variance Source Squareness and Degrees of Freedom Squared fabric tightness Effect on fabric stiffness. The yarn twist was maintained at 90æ»/10cm~130æ»/10cm. The effect of the fabric tightness on the stiffness of the fabric was analyzed. The regression equation was as follows: Y=variance analysis is shown in Table 4. at the level of significance a= fabric stiffness There is a significant one-way linear relationship between degrees.
Table 4 Variance Analysis Table Squareness of Sources of Variance and Mean Square of Degrees of Freedom (3) Effect of the combination of yarn twist and fabric tightness on fabric stiffness. The above analysis is the influence of a single factor, but the discussion of the factors affecting the stiffness of the fabric tends to focus more on the combined effects of the factors. Now we combine two factors (yarn twist, fabric tightness) and use regression analysis to derive the empirical formula as follows: The variance analysis table is shown in Table 5. At the level of significance a = 010, since F>F). 90(2,3)=5.4, so there is a significant linear relationship between stiffness and fabric stiffness when the yarn twist and fabric tightness are combined.
Table 5 Variance Analysis Table Variance Sources Squareness and Degrees of Freedom Mean Square 2.2 Fiber Material Different Fabric Stiffness Analysis For different fiber materials, the fabric stiffness is not only affected by yarn twist and fabric tightness, but also with fiber stiffness. It's about touch. Polyester fibers contain benzene rings, which have greater stiffness. Therefore, due to the addition of polyester fibers to the 7 and 8 samples, the stiffness of the fabric is significantly increased. Moreover, the polyester fiber content of the 8 samples was higher than 7 samples, and the stiffness of the fabric was significantly higher than that of the 7 samples. Although wool fibers are soft, the average fineness is coarser than cotton. Test results have shown 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, 9 and 10 wool fabrics, although the yarn twist and fabric tightness are less than 1 ~ 6 cotton fabrics, but the stiffness of the fabric is still high.
3 Conclusion There is a significant linear correlation between fabric stiffness and yarn twist and fabric tightness.
The fiber raw material is a pure cotton fabric. The empirical regression formula of the stiffness and yarn twist of the fabric is 2.628+001X. The fabric material is a pure cotton fabric. The empirical regression of the fabric stiffness and the fabric tightness is obtained through the test. The formula is 2.129+00207X. The fiber raw material is pure cotton fabric. Considering the influence of yarn twist and fabric tightness on the stiffness of the fabric, the experience obtained for different fabrics of fiber raw materials, the stiffness of the fiber itself and the fiber diameter will also be Affecting the stiffness of fabrics should be considered comprehensively in fabric design.
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