Pressure Control Of Flat Screen Printing Machine

  • Regarding the printing of fully automatic Stenter, it is composed of five elements. They are 1. Screen printing plate, 2. Scraper, 3. Ink, 4. Printing table and 5. Substrate.
    The automatic screen printing machine uses the basic principle that the mesh of the graphic part of the screen printing plate can pass through the ink, and the mesh of the non-graphic part cannot pass the ink for printing. To achieve good printing results, the pressure of screen printing must be controlled. So how to control the pressure in the automatic screen printing machine printing? We together look!
    In screen printing, proper and uniform printing pressure is an important guarantee for obtaining high-quality screen prints. If the printing pressure is too low, the printing plate cannot touch the substrate and cannot be printed, resulting in incomplete printing graphics and uneven ink thickness; when the printing pressure is too high, the screen will be deformed too much and the printed graphics will be blurred. Printing failures such as severe abrasion of the screen and squeegee. If the printing pressure is uneven, more printed product failures will occur. Therefore, controlling the factors that affect the printing pressure and improving the unevenness of the printing pressure have become the primary problem to be solved by the screen printing process.

    The function of the printing pressure of the automatic screen printing machine is to ensure that the screen is in full line contact with the printing surface. Under this premise, the smaller the better. Because the greater the pressure, the contact between the scraper and the screen is better, but the degree of flattening of the screen and the degree of insertion of the scraper into the mesh are higher, so the amount of ink transfer is small, the greater the deformation of the scraper, which will affect the oil filling. The state has a greater impact, and will also increase the deformation of the screen, and the friction between the scraper and the screen will also increase, which not only increases the friction on the screen, but also affects the printing speed.
    During the screen printing process, the squeegee is in horizontal contact with the screen and generates pressure, so the squeegee must be worn after a certain number of uses. At the same time, collisions are unavoidable in use, so the squeegee will show scars, and the printing effect will be affected when the squeegee is worn; therefore, before printing, check the straightness, sharpness and defects of the squeegee strip.
    After the scraper is worn, it needs to be re-ground and then used. Re-grinding is divided into manual grinding and mechanical grinding. Generally speaking, during manual grinding, the point of view and pressure of the squeegee will affect the grinding effect. In order to ensure the straightness of the blade, you can usually put sandpaper on a flat wooden board and stand a piece along the grinding direction. Straight siding with sharpening board. However, the quality of the mechanical grinding blade is uniform and stable, which is better than the manual grinding. In actual production, the scraper after grinding should also be checked.
    The squeegee pressure of the Flat Screen Printing Machine is directly related to the ink handling. The greater the squeegee pressure, the greater the ink handling capacity. The spread of the ink will cause the dots to expand, which will blur the print when it is severe; the greater the squeegee pressure Smaller, the smaller the amount of ink carried, the dots will be unclear or the imprinting will be incomplete.