Viewing the Development of Small Offset Printing Machines at Home and Abroad from ChinaPrint 2001

This exhibition, Heidelberg, Germany, Libya, Hamada, as well as domestic Wei Haitian, Weihai Printing Machinery, Yingkou Guanhua, Huaifang Huaguang, Beirenjiji and other manufacturers have small offset press exhibitors. Throughout these products can be summarized into four categories, namely office offset press, color multifunction offset press, modern commercial offset press and direct imaging offset press. First, the office offset printing machine This machine has desktop and floor type two, this is the late 1970s and early 1980s import and production of the machine, to adopt the vertical feed, front separation paper and intermittent feed method. The printing speed is relatively low (below 8000 sheets/hour). Generally no side rule is set and color overprinting is not possible. It is applicable to the needs of factories, mines, institutions, institutions, and individual operators to print short-runs quickly, coupled with a reasonable price/performance ratio. Therefore, there is still a certain degree of vitality in the domestic market. Second, color multi-function small offset press This model is based on the office offset press, in accordance with the needs of the market to improve (or re-design) and achieved. In order to carry out color overprinting, a side positioning device must be added. An additional paperboard (or bridge plate) must be added. Some machines have two-color heads to achieve two-color printing (two printing rollers are used to complete the two-color printing on the rubber roller. ), Or increase the number of units to achieve the number, pressure line and other functions. Most of these machines were previously separated from paper, and the longitudinal feeds and printing speeds were not more than 10,000 sheets per hour. The ink path design was mostly inking rollers, and the degree of automation was not high. This is a model that has been developed by various domestic manufacturers in recent years, and it is also a small offset press with the largest sales in the domestic market. Inking rate distribution of three kinds of machines Sorting type Ink roller number Inking roller number Ink rate %1234SM52-418436.1536.159.2418.46 Ryubi 52 series 17443.4843.484.358.69 Hamada B45216371.4214.2914.29 Third, modern commercial small offset press The exhibition of modern commercial offset presses at this exhibition has brought the development of small offset presses into a new era. In particular, the live performances of the SM52-4 and Riyou 522H models in Heidelberg attracted a large number of visitors. The operation of the machine to print the exquisite products, so that the experts are full of praise. This type of machine has a higher printing speed (13,000 sheets/hour to 15,000 sheets/hour), a higher automatic control system, and a multi-color overprint structure of the unit type. There are also Japanese Hamada B452 type, Heidelberg India GT052 type, and China's Weifang Huaguang HG52 type four-color unit type offset press, but the printing speed (8000 / hour) and the degree of automation is lower. Observe and analyze modern commercial offset presses. They are designed with the following advanced and reasonable mechanisms. 1. With the continuous (or variable speed) paper feeding mechanism, the Heidelberg SM52-4 type adopts a rear-end separating paper, continuous and variable-speed conveying paper feeding device, which makes the speed of the paper conveyed by the high-speed conveying slower when it reaches the front gauge, ensuring the smoothness of the former specified position. Sex. 2. The use of hem-type front gauges and paper-handling mechanisms is the current widespread use of high-speed large offset presses. The SM52-4, Ryobi 522H and Hamada B452 models all use this mechanism. The hem type front rule can increase the positioning time of the paper and ensure the accuracy of the positioning of the rule parts. The design, processing and assembly of the hem-type delivery mechanism are easy to ensure the accuracy of the movement and the smoothness of the delivery. 3. With double-diameter impression cylinders, two colors share an impression cylinder. When printing thick paper, the paper is bent little, the graphics and text deformation is small, and the gloves are easy to print accurately. Make the machine compact. 4. Automatic control level is high, Heidelberg Speedmaster SM52-4 type CP2000 control center is a standard configuration, it is a touch screen that can be rotated, it realizes the machine's automatic printing, that is, ink and register remote control system, to achieve ink balance and remote control week The horizontal, horizontal and cross currency register, the pressure is automatically adjusted, the paper automatically flips, and the ink roller, blanket and impression cylinder are automatically cleaned. The Ryobi 522H and 524H series are equipped with the “BYOBI-AAC” printing plate water film automatic control system, the “BYOBI-matic” continuous dampening system, the “BYOBI-PCS” printing control system, and the printing plate calibration remote control device. , semi-automatic version, automatic cleaning device. This shortens the commissioning test time, reduces paper waste, and reduces labor intensity. 5. The distribution of ink roads and inks is more reasonable. The common ink path is shown on the left, and the ink distribution is shown on the right. From the calculation results, it can be seen that they are all in accordance with the light weight of the front weight. The Ryobi is better arranged than the 52 series. 6. In-line coating glazing, Speedmaster SM52-4 type, Lee Youbi 52 series can increase the coating machine on-line coating, printing and finishing to achieve a complete, thereby expanding the scope of the small offset press market demand. Fourth, direct imaging offset press Heidelberg fast shutter D146-4 direct imaging offset press has been unveiled in many exhibitions in China, this machine is waterless offset, it can directly receive prepress digital information, directly on the special plate Simultaneous imaging of four-color printing plates for overprinting. In summary, the overseas small-size offset press has developed rapidly and has a high level. The design idea is the miniaturization of a large offset press, such as the Speedmaster SM52-4 main control center CP2000, which is a mature application technology of Heidelberg on the large offset press. There are also variable-speed feeds, hem-preregulators and paper-handling mechanisms, double-diameter impression cylinders, etc. For this reason, the quality of their prints can be comparable to that of large offset presses, and they can compete with large offset presses for small, fine prints. . In contrast, there is still a certain gap between the design level and the degree of automation of domestic small offset presses. With the development of the information society, the demand for small format, fast and delicate prints has increased, and the market for commercial small offset presses has been seized. All manufacturers have great opportunities for development.