In screen printing plate making, silk screen is one of the main raw materials. When printing thin lines or four-color dot images, the relationship between the silk screen and dots should be considered. This is because the presence of the silk screen causes the dots of the highlight part of the printed product to be distorted or lost by the mesh; the dots of the dark tone part may fall in the center of the mesh, and the attachment is not secure due to insufficient support. Cause layer loss. The parameters of the wire mesh mainly include: the material type of the wire mesh, the color of the wire mesh, the weaving method of the wire mesh, and the geometric parameters of the wire mesh. Since the first three parameters are easy to choose in production practice, the following mainly discusses the geometric parameters of the wire mesh Ok. 1. Calculation of dot size The round dots with the screen line number of L and D is the dot diameter (um). The area of ​​the circle is: S2 = Ï€ (D / 2) 2 Let Sl = S2, then: D = 1.1284 × 1000 (2.1) In multi-tone tone printing, Euclidean dots are used more, that is, in the range of higher or lower tone values, the dots are round and square at 50% area ratio. 2. Calculation of geometric parameters of wire mesh â‘ Mesh number n: the number of threads per inch or centimeter, as shown in the figure n. â‘¡ Wire diameter d: indicates the thickness of the mesh. For the mesh with the same mesh number, according to the thickness of the mesh, it is divided into the following four different levels: S, M, T, HD four levels, the mesh gradually becomes thicker from the S level to the HD level. â‘¢Opening OP: It indicates the distance between two meshes in the wire mesh, which is calculated from the mesh number and wire diameter. OP = 1 ï¼ nd â‘£Aperture ratio A0: It represents the percentage of the total area of ​​the screen leakage area. A0 (%) = OP2 (OP + d) 2 ⑤ Screen thickness Ft: It indicates the distance between the screen surface and the bottom surface. The empirical expression of the screen thickness in actual production is Ft≈1.82d. Kitchen Gadgets Kitchen Gadgets,Popular Kitchen Gadgets,Silicone Kitchen Gadgets,Stainless Steel Kitchen Gadgets Yangjiang Homelife Industry & Trading Co., Ltd. , https://www.kitchenutensil.de
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