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The pad printing process is very simple, using steel (or copper, thermoplastic plastic) gravure, the use of silicone rubber material curved surface printing head, the ink on the gravure plate to the surface of the printing head, and then to the desired surface of the object Press to print characters, patterns, etc. The type of pad printing machine is a special printing technology that has just been introduced to China in the 1980s. Because it has very obvious advantages in printing on small-area, irregular-surfaced products, it makes up for the lack of screen printing technology. Therefore, In recent years, it has developed very quickly. In the early 1990s, with the further opening up of the Chinese market, a large number of foreign-funded enterprises with electronic products, plastics, gifts, toys, and other traditional industries as the main products entered the Chinese market one after another. Pad printing technology and screen printing technology as the main decoration methods were obtained. Extraordinary development, according to incomplete statistics, the use of pad printing technology and screen printing technology in the above industries reached 27%, 64%, 51%, 66% respectively. Pad printing refers to the irregular surface of the substrate (such as instruments, electrical parts, toys, etc.), the use of copper or steel intaglio, through silicon rubber into a hemisphere-shaped printing head, press the ink to the layout Transfer to the substrate to complete the transfer printing method.
Pad printing machine is mainly composed of printing plate device (including ink supply device), squeegee, pad printing rubber head (usually silicone material) and printing table.
There are many ways to apply ink to an etched plate (steel plate). The ink is first sprayed on the etched board, and then excess ink is scraped off with a retractable squeegee. At this time, the solvent in the ink remaining in the etched area evaporates and forms a gel-like surface, and the rear glue head descends onto the etching plate and sucks the ink.
Ink absorption and printing products: After the rubber head sucks up most of the ink on the etching board, it rises. At this time, this layer of ink volatilizes again. The remaining ink surface of a part is more conducive to the closeness of the printed object and the plastic head. Combine. The shape of the plastic head should be able to produce a rolling action to eliminate excess air from etching the surface of the plate and the ink.
In the production process, the ideal combination of ink and plastic head is that all the ink on the etched board is completely transferred to the object to be printed. During the production process, ink adhesion close to 10 μm or 0.01 mm is transferred to On the substrate, the print head is easily affected by air, temperature, and static electricity. If the evaporation rate and the dissolution rate are controlled in equilibrium from the etching of the plate to the transfer of the plastic head to the substrate, the printing is successful. If evaporated too quickly, the ink will have dried before it is absorbed. If the evaporation is too slow, the surface of the ink is not yet gelatinous and it is not easy to attach the rubber head to the substrate.
Introduction to the concept and process of pad printing
Pad printing is one of the special printing methods. It can print text, graphics, and images on the surface of irregularly shaped objects, and is now becoming an important special type of printing. For example, the characters and patterns on the surface of the mobile phone use this type of printing method, and the surface printing of many electronic products such as computer keyboards, instruments, meters, etc., is completed by pad printing.