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Low Price Black Corundum Manufacturers Germany

The positioning method is: first of all, the front and back plates are aligned relative to the microscope or on the transmission table(silicon carbide abrasive). Two or three locating holes can be punched out of the effective image of the negative plate by using a film punch. One of the plates which has been punched with positioning holes is taken to compile the drilling program(brown fused alumina 60 grit). The locating holes and other component holes can be drilled at one time.


Low Price Black Corundum Manufacturers Germany MOQ: 1 Ton! 19 Years Experience Black Corundum Manufacturer, 35,000m² Workshop Area, Free Samples, Fast Delivery!


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After the circuit board is metallized, it can be used to locate the negative film(brown fused alumina). This kind of fixing pin is divided into two sets of systems, one is to fix the photographic plate and the other is to fix the printed circuit board. By adjusting the position of the positioning pin, the overlapping positioning of the photographic plate and the printed board is realized(green silicon carbide). This method can also be used to locate the double-sided plate.(low price black corundum manufacturers germany)


To get the correct amount of crime light, we need to determine an optimal exposure time(brown aluminum oxide). By adjusting the position of the positioning pin, the overlapping positioning of the photographic plate and the printed board is realized. Chemical cleaning is to remove oil, fingerprints and other organic contaminants on the surface with alkaline solution(black silicon carbide). Finally, micro coarsening was carried out to obtain the roughened surface with excellent adhesion to the dry film.


(low price black corundum manufacturers germany)When there is no optical densitometer, this kind of fixing pin is divided into two systems, one is to fix the photographic plate, the other is to fix the printed circuit board(brown aluminium oxide). The two kinds of positioning methods are mostly used in the former one. There are two to four locating pins(aluminum oxide abrasive). The more the number of pins, the higher the positioning accuracy and the more difficult the positioning is, which should be selected according to the needs.


In addition to the positioner mentioned above, there is also a positioning method without positioner(brown fused alumina price). In this method, two negative plates a and B are completely overlapped on the transmission table, and fixed with adhesive tape at appropriate positions, and then the two sides of the bottom edge are fixed on an "L" shaped skeleton(aluminum oxide grit). When positioning, just put the metal sheet between the two negatives and fix it with adhesive tape.(low price black corundum manufacturers germany)


No matter which method is used to determine the exposure time, it is meaningful to establish a constant light intensity of the lamp(white alumina). With the aging of the lamp, the light intensity will be reduced, and the original exposure time should be based on the actual situation(synthetic corundum). On the contrary, under exposure makes the pattern electroplating line thicker and the printed circuit board etched line thinner. When the static light is excessive, it will be difficult to develop, brittle film, leaving residual gum and other defects.


(low price black corundum manufacturers germany)The appropriate exposure time can also be determined according to the brightness of the dry film after development(pink corundum), whether the image is clear, and whether the line width of the image is consistent with the original film. When conditions permit, the determination of the photoluminescence time can be calculated with riston 17 grade or siyangfei grade 21 optical density ruler(emery abrasive). The oxide layer is then removed with an acid solution.


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Brown Fused Alumina And White Fused Alumina MOQ: 1 Ton! 19 Years Manufacturing Exprience, 35,000m² Workshop Area, Factory Price, Free Samples, Fast Delivery!

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