Study On The Law Of Fabric Structure Parameters On The Pressure And Life Of Fabric Keyboard

In recent years, with the progress of science and technology, smart textiles are becoming the popular research field. In this paper flexible fabric keyboard was woven by three dimensional weaving methods according to the conventional keyboard’s characteristics and research at home and abroad. The evaluation index has two, conductive pressure and life, respectively. On the basis of single factor experiment design, the five structure parameters were analyzed including the insulating materials types, conductive points, the support compression modulus, the key size, the pad yarn fineness of the support. Depending on the Response Surface Methodology, the Box-Behnken design was applied to study optimization of the conductive pressure and life.In order to explore the relation between the evaluation index and the structure parameters, the single factor experiment design was applied. The experiment results showed that the same structure parameter with different levels revealed different performance. As for the conductive pressure, when the insulating material was aramid fiber the conductive pressure was about 120cN. When the conductive points were 12, the conductive pressure was between the 120 and 130cN. When the pad yarn.was polyester filament or nylon filament, the two samples didn’t appear to be much different and the conductive pressure was about 120cN. For the key size, when the warp system had six cycles and the weft had eight roots, the conductive pressure was in steady level and was 130cN. For the support yarn fineness, when the fineness was between 200 and 300tex, the conductive pressure was in 120-230cN.As for the life, when the insulating material was aramid fiber the life was best, the polyester filament keyboard the second and the polyester spun yarn keyboard was the worst. As the conductive points were 12, the life could reach 30000times. And for the support pad yarn, when the support compression modulus was in 0.205-0.223N/mm2, the life could be about 35000times. For the key size, when the warp system was six cycles, the weft eight roots or the warp system five cycles, the weft five roots, the life can reach 32500times. For the support yarn fineness, when the fineness was in 170-250tex, the life can reach 32500times and the fineness was greater than 300tex, the life was less than 3000times.Base on the single factor experiment design, a four-factor three-level Box-Behnken design experiment with 29 runs was employed, and a quadratic regression model were fitted by RSM on the condition of setting the insulating materials as the fixed material while setting the other four structure parameters as variables. The significance of model, the significance of experiment factors, the significance of the interactions between factors, the reliability of the model were verified. The experiment values and predicted values of the conductive pressure were 157.001 cN/162.87cN, respectively. The results error was 3.7381%, which was less than 5%. The experiment values and predicted values of the life were 19986/20778, respectively. The results error was 3.9627%, which was less than 5%. The results showed that the model was in excellent agreement with the experiment value and can predict the actual expression.