To solve this problem, many printer manufacturers have adopted plug-in technology. The so-called plug-in technology is to make the plate cylinder, blanket cylinder and impression cylinder on the printing press into an independent component, which can be removed as needed. In this way, several inserts with different cylinder sizes can be made according to the size of the printed matter. However, this technology still has unsatisfactory features. First of all, the cost of making a plug-in is relatively high. If the size of the print is too large, the cost of the plug-in will be higher. Secondly, the plug-in is relatively heavy, and it is laborious and time-consuming to replace. Although it has been repeatedly improved, it is still very cumbersome. In addition, since the rotation of the drum needs to be driven by gears, the diameter of the drum cannot be arbitrarily designed.
The emergence of sleeve technology makes printing of different sizes of prints more flexible, but when replacing the sleeve, the transmission gear must also be replaced, and the size change cannot be changed steplessly.
The emergence and application of shaftless drive technology has greatly improved this situation. After the rotary offset press uses shaftless drive technology, all the axes are driven by servo motors. In other words, the printing plate cylinder, blanket cylinder and impression cylinder are driven by independent servo motors. Due to the elimination of the transmission shaft and transmission gear, the shaftless drive offset printing machine can realize the stepless change of the size of the printing plate and print the printing materials of different thicknesses.
It can be said that the perfect combination of the simplified technology and the shaftless drive technology has changed the situation that the rotary offset press is limited in the length of repeated printing, and set off a new revolution in the offset printing market. Drant-Geber is the first manufacturer to apply shaftless servo motor technology to a rotary offset press. Its concept of VSOP (Variable Sleeve Size Offset Printing Technology) enables printing plates and blankets to be installed in The sleeve made according to the length of the printing piece has the characteristics of light weight, easy operation, fast replacement, high flexibility, and wide range of printing materials.
At present, in the packaging and label market, the competition of various printing technologies is very fierce. In the short version printing, rotary offset printing has an advantage over gravure printing and flexo printing. First of all, the offset printing plate can be done immediately, and it has excellent performance in screening, gradation, minimum dot size, fine lines and text. Secondly, for different types of printing materials, such as cardboard, labels and films, if gravure or flexo printing is used, the requirements for plate-making are different. However, if offset printing is used, the replication curve and printing quality are the same for different printing materials. In addition, when printing on different substrates, offset printing also has great advantages in terms of color consistency. Therefore, in today's printing volume is getting less and less, the price is getting lower and lower, rotary offset printing will have more markets and opportunities, and, with the new materials such as direct plate making and seamless rubber blanket The successful development of web offset printing will usher in a broader development space.
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