The use of pad printing steel plates in the pad printing process occupies a dominant position. 100% oil pan pad printing machines and 16% pad printers use thick steel plates with a thickness of about 15mm; another 77% pad printers The pad printing machine uses thin steel plates with a thickness of 0.25mm and 0.5mm. Whether it is a thin steel plate or a thick steel plate, the plate-making process is the same. The substrates used are roughly the same. The steel plate must have a fine organizational structure, and the surface finish should be high enough. The former guarantees the neatness of the edges of the pictures and text after corrosion, and then ensures the integrity of the dot structure, so that the sharpness and color restoration of the printed pictures and texts can be maximized; the latter guarantees the cleanliness of the scraped ink and the durability of the printing. The thickness tolerance of the thick steel plate used on the oil cup pad printing machine is higher. If the surface tolerance is too large, on the one hand, it accelerates the wear of the oil cup. On the other hand, it also relates to the sealing of the ink. It is used on the oil pan pad printing machine. If the steel plate is to be used in the oil cup machine, it is necessary to ensure a higher surface finish and a lower flatness tolerance. The thin steel plate has better flexibility, so the cleanliness of the ink scraping is easy to ensure, but this is related to the manufacturing accuracy of the substrate supporting the thin steel plate. The surface tolerance of the substrate is not satisfactory, and the ink will leak during the sliding process of the oil cup and the steel plate. Another factor is the manufacturing accuracy of the sliding guide shaft of the oil cup, such as surface roughness and fit tolerance, which is reflected in the assembly level of the machine. How to control the parallelism tolerance between the guide shaft and the steel plate is very important. From this point of view, it is more difficult to manufacture thick plate oil cup pad printers. Resin version The application of resin plate to the printing process is not long, but it has been paid attention to. The resin plate is mainly made of nylon photosensitive glue, which is cast on the surface of the zinc plate, similar to the resin plate used on the self-adhesive trademark. Nylon has very good abrasion resistance, and is capable of repeated rubbing of oil cups or scrapers after photocuring. The advantage of using a resin version is first of all that it is easy to obtain extremely fine dots. The resin version is the first choice when printing exquisite small items. If the manufacture of pad printers reflects the manufacturing level of an enterprise, it will be more difficult to manufacture pad printers that use resin plates. Nylon photoresist is a polymer material after all. When the substrate supporting it has poor manufacturing accuracy, pad printing It is not easy to complete general printing by machine. The surface state of polymer materials is very fine, and slight defects will seriously affect the printing quality. Plate making process At present, the production of pad printing steel plates is mainly performed by using a nitric acid solution and a ferric chloride solution added with a protective agent for corrosion. The acid smell of this kind of corrosion is unpleasant, and the generation of nitric oxide and nitrogen dioxide is very harmful to the human body. The development of the steel plate after corrosion is mostly based on the use of chemical solvents with hydrogen peroxide as the main body. It also has a certain effect on human skin. damage. Therefore, it has been banned in European countries. They started to use resin plates or laser engraving to make plates. It is a relatively novel idea to use the powder-free corrosion machine that corrodes the zinc plate to corrode the steel plate. Some manufacturers have successfully tried it. This method greatly reduces environmental pollution. Resin plate making is much more environmentally friendly and safer. The resin plate uses nylon photoresist, which can be developed with sprinkling liquid. With the popularity of digitization, it will not take too long to produce digitally printed resin plates using digital methods. Ink Pad printing inks are still dominated by solvent-based inks. Pad printing inks have been replaced with screen printing inks, and the effect is also very good. At present, most ink manufacturers treat pad printing inks and screen printing inks as one series . However, screen printing inks used in the pad printing process also have many problems. MARABU has pioneered the development of pad printing inks. In contrast, dedicated pad printing inks dry faster and more stable, and have better thixotropy. The ink layer of the pad printing process is relatively thin. To obtain more striking handwriting, the pigment purity in the ink is higher and the fineness is finer. These are the difficulties in manufacturing pad printing ink. At present, in addition to MARABU company's special series of pad printing inks, German DUJO company's pad printing inks have begun to occupy a certain market. In addition, there are very few special printing inks, and the British COATES ink, which is famous for the production of screen printing inks, also has a large market share as an alternative to low-end products. The printing ink market is vast and profitable, attracting the research and development of many domestic companies. The domestic ink production has recently developed very rapidly. The prominent ones are Zhongshan Zhongyi Ink Co., Ltd., Hangzhou Kewang Ink Co., Ltd., and Shenzhen Miramar Ink Ltd. etc.
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