Performance analysis of six most popular offset pr

Performance analysis of six major brands of offset press

almost all people engaged in the printing industry know these six major brands of offset press: Heidelberg, Manroland, gaobao, Mitsubishi, Komori, Akiyama, etc. Of course, there are other brands of offset printing machines, such as Shinohara, Sakurai and so on. Due to space limitations, this paper only discusses the offset press of the first six brands. Heidelberg

Heidelberg has a long history and great influence in China, and its sales volume is also the largest in China. In the mid-1990s, Heidelberg changed the traditional rotary paper transfer mechanism used in its split and four boot into a downward swinging paper transfer mechanism, and its machine speed can reach more than 15000 rpm. Compared with other machines, Heidelberg's down swinging paper delivery mechanism is a conjugate cam mechanism in the form of a cam swing rod (relatively simple compared with other mechanisms), and the open and close tooth mechanism adopts a structure in the form of a cam pushing fork. These two structures are unique

another special feature is that the middle traditional roller adopts the structure of three times the diameter, which increases the distance between units and increases the operating space. The processing difficulty of three times diameter roller is much greater than that of double diameter roller, and the installation and debugging are relatively difficult. The new H105 changes its three times diameter drum into a double diameter drum, and the speed of the machine can reach 18000 RPM (H105 is a wide format printing equipment launched by Heidelberg. Compared with h102, it has greater advantages in adapting to printing, especially suitable for packaging printing brush. Its paper feeding part adopts a unique blast transmission technology, which can maintain good transmission characteristics according to different substrates). Equipment consumables. From the general trend, at present, more paper transfer rollers adopt double diameter structure. Heidelberg's off platform pressure machine has always adopted a three-point suspension structure, which can play a role in safety protection, but its off platform pressure sound is relatively loud when working at high speed

pm52 launched by Heidelberg in the past two years is a product between GTO52 and sm52, which generally shows positive and negative. The automation degree of each product is between the two, but the price is relatively moderate. Heidelberg's Feida structure is relatively simple. Although it has also been improved in the past two years, on the whole, its adaptability of tissue paper is slightly weaker. The new Heidelberg sm52 can be equipped with a roller die-cutting device, which integrates printing and die-cutting, and greatly improves the efficiency of servo electromechanical printing. At present, CP2000 is a representative work of Heidelberg, which is characterized by convenient operation. Two people can complete the operation, which not only improves the efficiency, but also reduces the cost. It uses a pull gauge and a push gauge, one for thin paper and one for thick paper, so its printing adaptability is also relatively wide. Another representative product of Heidelberg printing machine is double-sided printing. The printing equipment with this structure has a variety of sets (l+10+2, l+40+5, 4+4), which provides great convenience for users to choose. One printing can complete double-sided monochrome or multicolor printing. But at present, the problem faced by this product in the domestic market is that the maintenance of its overturned part is more troublesome. Theoretically speaking, the current structure does need further improvement and improvement in technology

Manroland

Manroland machine has a relatively large influence in China, especially in the south. Manroland machine gives people the impression of durability, high precision and high degree of automation. Different from Heidelberg machine, the diameter of the cylinder of its split series printing machine is 300mm, and the paper transfer line completely adopts the non-contact double diameter cylinder structure. The inking roller adopts a mechanism that can be moved in series (other manufacturers also adopt a similar structure), so that ghosts can be eliminated

hollow roller bearings are used for the impression cylinder of Manroland machine, and there is a certain pre pressure during installation, so that the bearing clearance during installation can be eliminated. Hollow roller bearing is considered to be an ideal bearing structure, but its processing is relatively difficult, and the tolerance requirements are particularly strict. The plate roller and rubber roller adopt sliding bearings (copper sleeve structure), which have strong impact resistance and high requirements for oil circuit. If the oil circuit works poorly, it will cause excessive friction during high-speed operation

another feature of Manroland machine is that it uses a long shaft to provide power. From the first group to the fourth group, it uses a long sleeve, and then drives the relevant mechanisms of each unit upward through the long shaft. The advantage of this mechanism is that it can ensure that all units work synchronously and reduce the transmission error between gears

Manroland machine is also equipped with a double paper feeding mechanism, which can adopt either reel paper feeding or single sheet paper feeding. When the web is used for paper supply, the paper roll part and its slitting part of the web can be sent to the paper feeding part. When using a sheet fed machine, just leave this part. Manroland machine takes into consideration the structural design of Feida. It adopts four paper separation suction nozzles and eight paper feeding suction nozzles, which has a strong adaptability to thin and thick paper. Manroland machine can complete post press operations such as stamping, embossing, die cutting and punching, which saves a lot of post press operation time. It is also the most integrated printing equipment in all printing machines

Manroland machine is also equipped with image monitoring, online color detection, online quality control and other quality control systems. These information can be connected with the network, so that users can understand the quality of their prints. Roland 900 belongs to the wide system printing machine, and its maximum width can reach 1.8m, which is almost the widest in all printing machines. It is especially suitable for packaging and printing, and its maximum thickness can reach 1.6mm (it can be used for cardboard and other printing)

KBA

KBA is a famous family. The vast majority of money printing machines in the world come from KBA, so its printing machine design technology and manufacturing technology are also the best in the world. 2. Wood pulp and finished paper: the main wood pulp varieties currently have a tax rate of 5%. The latest KBA paper transfer mechanism adopts a double acceleration mechanism. The paper transfer tooth first increases the paper speed to about 60% of the maximum speed to the paper transfer drum, and then accelerates to the maximum speed to the embossing drum through the paper transfer drum twice. Therefore, the maximum speed of the machine can reach 20000 rpm, which is the fastest printing machine in the world. Its Feida presser foot does not have air blowing, so its inertia in the working process is relatively small, suitable for high-speed operation. Its flying head can float up and down, always at a specified distance from the paper surface, thus greatly improving the stability and reliability of paper transmission. At present, only KBA company adopts this technology, and the Feida heads of other manufacturers are not fixed