Wet offset printing is the most common printing process in the printing industry today. The basic principle is to use the water-ink balance of the printing area (printing ink) and non-printing area (water) on the printing plate. The key is to maintain the stability and control of ink and water balance. Waterless offset printing uses a silicon coating on the printing plate as a non-printing area, removing water and ink balance control, and eliminating the use of water as a medium. From the point of view of printing quality, printing without water makes the printing dots of waterless offset printing sharper and better performance. Waterless offset printing has the ability to achieve higher line counts and contrast. From the point of view of printing durability, wet offset printing is more compatible than waterless offset printing. Water can be seen as a cleaning function for printing plates and ink paths, a bit like a self-cleaning function during printing. In the waterless printing plate, dust and paper dust will damage the silicon coating of the waterless offset printing, making the selection of the substrate and the cleaning requirements of the working environment more demanding. In general, waterless offset printing requires more demanding printer maintenance and operator skills. Even with a slight error in the process, the print quality may also vary greatly. The problem of ink temperature, although after years of technological development, waterless offset printing is still a very complicated process. Each process requires perfect control in order to achieve high printing quality. When the printing speed is higher than 150 meters per minute, wet offset printing requires cooling rollers to cool the heat accumulated in the printing group, which may affect the performance of the ink and the density of the ink. Waterless offset printing requires a cooling roller to cool the ink path at any printing speed, as well as cooling the printing plate in the center of the plate roller, because the temperature of the printing ink is extremely sensitive to controlling the printing quality. The working temperature of printing ink is limited to a very narrow range, only 3 ~ 4 ℃. Depending on the supplier, above or below this temperature, the printing ink will become unstable and the printing quality will be affected. In order to achieve better control of printing results, air conditioning temperature control is required in the factory. From the perspective of consumables, there is only one supplier of waterless offset printing plates, not many ink and ink suppliers. The suppliers of wet offset printing consumables are actually numerous. For the cost of consumables, since waterless offset printing is not much in the industry, the cost of consumables is obviously higher than that of wet offset printing. In some cases, the price of inks and plates can be three times higher. The waterless offset claims that it does not need to deal with the balance of water and ink, so it can reduce machine waste. On the other hand, modern wet offset printing can automatically adjust the ink supply and water treatment, which also makes the control of water and ink balance more accurate and faster, which is comparable to waterless offset printing. In fact, the process of controlling the ink supply will largely affect the performance of wet offset printing and waterless offset printing. Because there is no water, waterless offset printing can achieve good printing results in a short printing turnaround time, provided that the conditions such as temperature and cleaning must be met, and the basic parameters have been correctly set. For substrates that do not understand, wet offset printing still needs more time, and more waste products are generated. When repeating the same printing job on a known substrate, the advanced offset printing unit can store the existing ink parameters, and can perform repeated printing. Its preparation time is shorter, which is similar to waterless offset printing. Water Pump is a machine that transports liquids or pressurizes liquids. It is mainly used to transport liquids including water, oil, acid alkali, emulsion, suspension emulsion and liquid metal, etc. It can also transport liquids, gas mixtures and liquids containing suspended solids. It transfers the mechanical energy or other external energy of the prime mover to the liquid, so that the liquid energy increases. According to different working principles, it can be divided into positive displacement pumps, vane pumps and other types. 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