Application technology of the hottest screen print

2022-08-14
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Application technology of printing scraper

in printing, controlling scraper is a very important process technology. In order to make the scraper run correctly in printing and achieve the desired purpose, manufacturers have made a variety of scrapers for customers to choose

the function of the scraper is to transfer the ink from the inside of the plate to the surface of the substrate, and disconnect the flowing ink according to the rebound force of the plate. The scraper consists of the hardness of the scraper, the sharpness of the front end of the scraper and the angle of the scraper

using a three-layer scraper, that is, a three-layer polyurethane scraper, can obtain deviation free ink transfer. It is better to have two scrapers with a hardness of 70 ° ~75 ° for the outer layer and 900 for the middle layer. The outer layer of the scraper can soften the substrate. The low hardness scraper will not damage the silk, and the printing is smooth. Single layer high hardness scrapers (80 ° and 90 ° scrapers) are not suitable for single and large amount of silk printing, and the plate will soon be damaged. In printing, when changing the version, try to shorten the time of changing the version as much as possible. In the case of continuous printing, it is best to use a scraper of 70 ° ~75 °

exchange of experience: the application technology of the printing scraper in changing the chuck that is fundamentally fixed on the body of the tester (attached figure)

the three-layer scraper, which places the middle layer with 90 ° hardness in the center, is designed to play a role in printing resistance of the substrate. The pressure of the scraper acts on the front end of the scraper. As the scraper moves. When the pressure of the scraper disappears, the moving ink is disconnected. Transfer the pressure of the scraper into energy and concentrate it on the front end of the scraper. Through a magnifying glass, you can see energy similar to solar energy. Although the operating pressure of each scraper is small, a lot of printing is kept. This kind of energy similar to solar energy is increasing exponentially. Under the action of the scraper pressure, if the substrate is offset, the center of the scraper pressure will move, and the ink cannot pass through the wire, which cannot effectively move the ink

the front end of the scraper must be very sharp. Test method. Sliding on it with your fingers makes you feel like splitting your fingers. This sharp scraper is suitable for silk printing of intermediate tone patterns. Otherwise, the scraper must be ground, and the scraper and handle must be installed correctly. There shall be no skew, non parallelism and other problems. Often check the scraper, and it is also of great significance in safety work to ensure the correct angle and sharpness of the scraper. Rest assured that it is very difficult to set the angle of the scraper. The reason is that if the front of the scraper is bent on the printing surface, the measured angle is an incorrect base point. Therefore, in order to control the correct angle of the scraper, the use of three-layer scraper has become a reason. The allowable angle range of the scraper is large. If the scraper angle is measured from the horizontal plane, the effective scraper angle is very large when the scraper angle on the printer is set during printing; The smaller the effective angle during printing, the more impossible it is to control the transfer of ink. Good printing results can also be obtained without changing the angle of the scraper when printing halftone patterns with silk

the higher the scraper pressure during printing, the better. Too much pressure becomes a disadvantage. In actual printing. The pressure at both ends of the scraper rises by 1/4. Therefore, when adjusting the scraper pressure, pay attention to the moderate scraper pressure and even scraper pressure

source: Japanese "silk printing" 2005.2

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