The hottest new guide material improves the qualit

  • Detail

New guide materials improve the quality of printing machines

in recent years, offset printing machine manufacturing technology has developed by leaps and bounds. From recent national and provincial large-scale printing equipment and equipment exhibitions, we can see that flat paper offset printing machines that once represented China's higher printing machine manufacturing level, machine 03 and machine 05 have almost disappeared from the exhibition, while the main models of expandable units are: WDS ⑵ 0h, WDS (5) 0h, WDS (1) 00h, WDW (5) 0h WDW (1) 00h or multi-color machines have become mainstream products in various exhibitions at all levels. These machines have been close to foreign brands in terms of function, quality, shape, human-machine function design and appearance vision, and some performance and indicators have been on a par with international well-known brands. However, users of offset printing machines have higher and higher expectations for the use of equipment. The humanized design idea of people-oriented has become a common goal pursued by both the supplier and the demander, especially the protection of the environmental conditions of machine operators, the reduction of skill requirements for operators, and the reduction of labor intensity. In the past, they did not pay due attention to these secondary contradictions as secondary contradictions, but now these secondary contradictions have risen to the main contradiction, Become the focus of common concern

the running speed of offset press used to be about 10000 printing per hour, and the impact of noise on people is often ignored. Taking foreign offset printing machines as an example, the limit speed has mostly reached 15000 to 16000 prints per hour, and many domestic machines are also sprinting towards this limit speed. The printing speed has been greatly improved. The demand for peek in western developed countries is still dominant, which increases the difficulty of machine design and manufacturing, and many key issues need to be tackled have been exposed. For example, the noise of the machine has increased significantly. In the past, although domestic offset printing machines also paid attention to the noise reduction problem of starting a new journey, most of their energy was focused on the regular system and the paper delivery mechanism, because these two parts have many reciprocating swinging devices, which are mostly composed of cam mechanisms with clearance movement, and have large inertia. They are recognized as the core mechanism with high accuracy requirements. They are not only the source of high noise, but also have a crucial impact on print registration. People believe that to grasp the main contradiction, we must grasp the paper feeding system, because they are the heart components and the components that people pay the most attention to. From the cam motion analysis of speed, acceleration, stress status, selection of part materials, heat treatment process requirements, etc., we have made serious efforts to tackle key problems. In fact, in recent years, with the efforts of various manufacturers, the paper feeding system of printing machines has been greatly improved, even in the state of high-speed printing, The benchmark accuracy and machine noise have been significantly improved, such as beiren's N300, Shanghai Guanghua's pzl020, Jiangsu Rugao's Changsheng series machine, etc. their rules and the design and manufacture of the paper delivery mechanism have reached a high level. However, the improvement of the paper receiving parts, which are another main noise source of the offset press, has made relatively slow progress

the high-speed friction between the sleeve roller chain and the guide rail of the offset press driving the paper receiving tooth row is one of the main noise sources of the machine. Reducing or eliminating the noise of this part was once a key problem for offset press manufacturers at home and abroad. In order to reduce the noise generated by the friction between the chain guide rail and the sleeve roller chain of the paper receiving tooth row, some foreign manufacturers adopted the fully enclosed guide rail scheme by reducing the gap between the guide rail and the chain roller, Improve the manufacturing accuracy of roller chain guide rail. When the paper receiving tooth row climbs up or passes through the arc, the chain can only cling to the surface of the guide rail. The centrifugal inertia force of the chain is eliminated by the constraint of the guide rail, and the running noise is partially controlled. Of course, the guide rail cannot be manufactured very accurately, and the gap cannot be absolutely absent. This noise reduction measure puts forward higher requirements for the design and manufacture, Relatively high requirements are also put forward for the lubrication of the contact surface between the chain and the guide rail, because if the lubrication is not sufficient, the chain will be prone to poor operation, increased wear, and even jamming. Some manufacturers have also improved the design of guide rail curve. When the chain needs to climb high, it is no longer a simple arc, but a function curve with small acceleration value. A straight line is arranged between the two back arcs at the inflection point of the curve of guide rail steering, so as not to suddenly reverse the centripetal acceleration of tooth row, so as to reduce the impact vibration during the operation of chain guide rail. In addition to the shape and accuracy of the improved design of the paper receiving chain guide rail, some manufacturers have made bold attempts in the selection of guide rail materials. For example, some manufacturers' products use engineering plastics for the chain guide rail, such as reinforced nylon. However, due to the self-lubricating changes brought about by the differences in the composition of nylon materials and the thermal deformation in the use occasions with drying and drying devices, its promotion speed and scope have been affected to a certain extent. Recently, some companies have tried to use new materials with special carbon fiber composite technology to make guide rails with satisfactory results. Jiangsu Rugao No.2 printing machinery factory, in cooperation with experts from Xi'an and Shanghai Institute of materials, has successfully developed a paper receiving and conveying chain guide rail with self-lubricating effect, maintenance free, oil free, wear-resistant, shock absorption and noise reduction effect through bold practical experiments with different formulations and processes, Due to the self-lubricating mechanism of the guide material, it has small friction coefficient, small resistance and less wear, which can fully realize the maintenance free function. Especially when printing large amount of ink on coated paper with high printing speed, the ink is not easy to dry. In order to prevent rubbing and dirt, the paper receiving part of the printing machine often needs to be sprayed with ink separation powder. When the dust is sprayed evenly on the surface, it flies everywhere, and the oil stain of the guide rail of the ordinary metal printing machine will be covered with dust at this time, The operator is laborious when cleaning and maintaining the equipment, and the dust on the guide rail surface will accelerate the wear of machine parts if it is not completely removed. The guide rail of the new material realizes no refueling and maintenance, and the dust removal work becomes very easy. The guide rail of the new material has the function of self lubrication, the friction coefficient is small, there will be no poor movement or jamming, the power consumption of the whole machine is small, and the characteristics of high temperature resistance are more suitable for the offset press equipped with multi row paper receiving chain with glazing and drying function. The unique shock absorption function of the guide rail is very beneficial to reducing the noise of the high-speed chain. The vibration of the machine is reduced. Do you feel that the express package in your hand is a lot heavier all of a sudden? Small, noise reduction can effectively improve the working environment, improve the stability of the machine, and even improve the quality of machine prints

the use of special modified carbon fiber composite engineering guide material on offset press is a bold attempt to use new materials and the result of innovative thinking. Its effect is exciting through preliminary testing and comparison. Many of its advantages are gradually recognized by people. With the continuous improvement and adjustment of material technology, it is believed that its performance will be more perfect. (end)

Copyright © 2011 JIN SHI