Printed board is a kind of color coated board with pattern or pattern. It is a new type of decorative board for household appliances and building materials developed in foreign countries in recent years. Printing color coating board will be
After the coating process, galvanized substrates are printed on the surface to obtain patterns of different patterns. The appearance of galvanized substrates is more beautiful, brighter, more rigid and better performance than laminates. With the continuous improvement of people's living standards, this product will be more and more popular in the market.
In recent years, developed countries such as Japan and South Korea have intensified their efforts in these areas and are in the forefront of technology. Although great progress has been made in the development of high-grade printing technology and equipment for color coated sheets in China, there is no such equipment in other production lines except on the No. 2 color coated sheet line imported by Baosteel, which is still a blank in this field.
Printed boards are usually finished by the production process of color coating line. At present, the widely used color painting production line is a two-coat and two-bake process, and its finishing machine is always equipped with two coat heads for rapid color change of topcoat. In this production line, printing can be realized, that is, the back pattern is engraved on the glue roll of No. 1 finishing machine, the glue roll transfers the pattern to the coating roll, and the coating roll transfers the pattern to the steel strip for printing. After drying, the No. 2 finishing machine coats varnish or transparent protective film on the surface.
In actual production, many coated products are printed on a separate unit. Such a unit is relatively simple, consisting of only one uncoiler, a printing stand heating furnace and a coiler. In order to print the pattern on the coating film of the coating plate, first etch the pattern on the copper roller, then chromium plating on the copper roller, which is used as the printing roller for coating printing. The pattern on the surface of the roller is concave. The printing roller is stained with the paste from the disc of the paste, and then the paste outside the depression is scraped off by the scraper. When the printing roll contacts with the transfer roll, the paste in the pattern is transferred to the transfer roll and finally printed on the surface of the steel plate. After heating and drying at appropriate temperature, the pattern is firmly attached to the coating of the steel plate.