High Precision Measurement Technique of Yarn Density And Yarn Crossover Angle in Mesh Cloth
SEN-I GAKKAISHI(2005)
摘要
Recently, the size of plasma display panels (PDPs) has been increasing, bringing about a need for a Mesh cloth that can function as an electromagnetic shielding material for these new, larger PDPs. A cloth which serves as an electromagnetic wave shield for a PDP is known as a PDP-mesh. The purpose of the present research was to propose a method of measuring yam density and yam crossover angle in mesh cloth. Although conventional trials of automatic measurement of yam density in which one dimensional fast Fourier transform (FFT) was applied were carried out, it was difficult to verify the design value of a mesh cloth with a single trial. In the present method, a measured value is provided mathematically by connecting a texture feature of the mesh cloth with a characteristic of two dimensional FFT. PDP-mesh was used as an example of a measuring cloth. The measurement error of the yam crossover angle with this method was found to be 0.1 degrees; additionally, we show that there is little measurement error of yam density. Furthermore, the accuracy of the measurements obtained by the present method does not depend on the installation state of the measurement sample.
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