A printing method and printing device using a printing screen

Abstract

The invention relates to a printing method and a printing device adopting a printing screen, and relates to the technical field of printing. The printing screen can be detected before printing working to correct a deviation of human examination; and the printing screen is detected during a printing working process, so that further damage to the screen, printing equipment and a product is avoided, and the yield of printing patterns is increased. The printing method comprises the following steps: providing the printing screen and a scrape-coating device which are placed above a machine table of equipment, wherein the printing screen comprises a blocking part and a transmitting part, and the scrape-coating device is capable of moving in the screen surface of the printing plate; and carrying out light transmittance detection on the printing screen in a front area in a moving direction of the scrape-coating device during moving of the scrape-coating device, so as to judge whether the light transmittance of the blocking part is greater than a preset light transmittance or not, and / or, whether the light transmittance of the transmitting part is less than 100% or not; and stopping the moving of the scrape-coating device while judging that the light transmittance of the blocking part is greater than the preset light transmittance, or the light transmittance of the transmitting part is less than 100%.

Description

technical field [0001] The invention relates to the technical field of printing, in particular to a printing method and a printing device using a printing screen. Background technique [0002] The printing screen is mainly composed of a screen frame and a wire mesh stretched tightly on the screen frame. A part of the screen is coated with a viscous emulsion to cover the holes of the screen to form a blocking part; the area not coated with the emulsion exposes the holes of the screen to form a transparent part for the next material. [0003] Due to the small thickness of the emulsion coating, it is prone to breakage, that is, there are areas not covered by the emulsion on the blocking part, causing printing glue such as glass glue to be printed on the substrate from the screen holes in these areas, resulting in glue leakage; In addition, due to the small area of ​​the permeable part of the printing screen, it is easy to mistakenly coat the emulsion on the screen surface cor...

AI Technical Summary

Problems solved by technology

[0003] Due to the small thickness of the emulsion coating, it is prone to breakage, that is, there are areas not covered by the emulsion on the blocking part, causing printing glue such as glass glue to be printed on the substrate from the screen holes in these areas, resulting in glue leakage; In addition, due to the small area of ​​the permeable part of the printing screen, it is easy to mistakenly coat the emulsion on the screen surface corresponding to the permeable part during the process of coating the emulsion on the screen surface corresponding to the barrier part. Causes the clogging of the screen hole of the penetrating part, resulting in poor printing of the glue pattern

[0004] In view of the fact that the integrity of the printing screen is prone to problems at present, the existing printing process can only artificially check the integrity of the printing screen before it is put into the printing operation of the printing screen. Checked out, resulting in defective printing patterns in subsequent printing offsets; at the same time, during the printing process, it was impossible to conduct real-time follow-up and feedback on the defective printing screens, which caused the printing blade to damage the blocking part during the process of moving under pressure. Exposed screens cause damage; and / or, poor printing patterns due to blockage of the permeable part, resulting in waste of printing equipment, substrates, printing glue, process time and costs

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