Secondary exposure process method

Abstract

The invention discloses a secondary exposure process method. The method comprises the following steps of selection of wire mesh, selection of screen frames, net pulling and washing device, coating, drying, secondary exposure, developing, inspection and packaging. Specifically, in secondary explosion, a screen printing plate is placed on an equal-height supporting platform, a high-flatness pressingblock is pressed in the middle of the top end of the screen printing plate, a balancing weight is pressed in the middle of the top end of the high-flatness pressing block, then the calibrated mesh isplaced into an exposure machine, time is adjusted, and after vacuum is achieved, an exposure machine switch is turned on to complete secondary exposure. The customized size and the customized weightof the pressing block are ensured; different specifications can be selected according to different screen printing plates, and the flatness of the pressing block is smaller than 5um, so that the screen printing plates are consistent in surface contact and stress, the pressing block can be used repeatedly, the cost is saved, the process consistency in the secondary exposure process is improved, thescreen printing plate precision is improved, the screen printing plate can be used repeatedly, the cost is reduced, vacuum is not involved, and the safety is higher.

Description

technical field [0001] The invention relates to the technical field of high-precision screens such as solar energy, MLCC, TP, PCB, and 5G antennas, and specifically relates to a secondary exposure process. Background technique [0002] The screen plate is composed of stainless steel woven gauze of different mesh sizes and latex coated on the gauze and installed in the net frame. The latex is removed at the opening of the screen pattern design. When the squeegee brushes the mesh, the paste applied on the screen can be printed on the substrate through the opening of the pattern. The printing thickness is mainly determined by the latex thickness. During screen printing, different printing thicknesses can be obtained according to the same screen, tension, latex thickness, squeegee pressure, squeegee speed, squeegee down and off-knife lag time and other parameters. In addition, the viscosity of the slurry, the hydrophilicity and hydrophobicity of the substrate surface, and the d...

AI Technical Summary

Problems solved by technology

When the blanket acts on the screen under the vacuum stretching state, the force difference between the four corners and the middle part of the screen is relatively large, so that the screen is also exposed in a deformed state, which greatly affects the accuracy of the pattern size

At the same time, when the blanket is used repeatedly, the cortex will continue to age, so the pressure of the vacuum is constantly changing, which also affects the accuracy of the screen.

And the blanket needs to be replaced regularly, resulting in waste of cost

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