The printing method with the largest share in the printing field today is still offset printing, based on the main reasons:
(1) A wide range of substrates (2) Can faithfully reproduce the original, and obtain a layered reproduction of the original (3) Compatible with multi-color high-speed (4) Can realize multi-sided printing (5) The number of printing can be more or less Short version work, but also long version work (6) The price is moderate and has a competitive advantage
As can be seen from the above, offset printing is a printing method with both quality and efficiency. The equipment that completes the offset printing process is called an offset press. Modern offset presses integrate various types of technologies such as machinery, electronics, instruments, instruments, acoustics, optics, pneumatics, and hydraulics. They cover the widest range of disciplines, have high product technology content, complete technical categories, and complex movements of machines during machine operation. There are many movements, strong coordination, and high technical requirements. Nevertheless, due to the continuous penetration and application of high technology in the printing industry, the development of offset printing technology has become more rapid, mainly reflected in the following aspects:
1 has the characteristics of an information society
With the acceleration of the global informatization process, people's demand for machines is no longer just to meet the most basic function of printing, it is no longer just to replace humans to complete manual labor, but more importantly to replace human thinking and judgment , Diagnose the state of the machine, and quickly respond and adjust, that is, the machine has intelligent functions. For example, one of the technical difficulties in offset press printing is water and ink balance. Although the offset press has been improved several times in the past, although the water and ink balance technology has made a big step forward, the difference between people's understanding of the amount of water has led to printed products. The quality will ultimately be a world apart. A machine without intelligent functions cannot keep the machine in the best state at all times. Now the scientific and technical personnel in the industry have tried to make the process parameters required by various complex situations into software on the basis of the experiment, which is pre-stored in the machine. As long as the operator enters the relevant data and starts the water-ink balance software system, the machine will run according to the best program. In the same way, the processing of machine fault diagnosis emergencies, special process requirements, and other manual tasks will also be gradually replaced by the intelligent functions of offset presses.
2 The operation is safer, more convenient and faster
The purpose of the design of offset presses is to put people first, and man-machine integration, so as to maximize the effectiveness of offset presses. Man-machine integration, first of all, to ensure the safety of machine operators and ensure that no machine or personal accidents occur under any circumstances. In the face of modern high-speed multi-color and large-scale offset presses, offset press design manufacturers have installed advanced high-sensitivity traditional technologies, such as infrared and ultrasonic, to the machine-related moving parts as shielding protection, when some operators are finishing When adjusting, clearing, etc., if the limb enters the motion field of the machine, the sensor will send a signal and the machine will stop, effectively avoiding personal injury. Some places with small operation space, or high-level operation technicians and requirements, or frequent operation, and high-strength places are often designed with improved mechanical and electrical automatic operations, so as to completely eliminate hidden safety hazards in labor, and eliminate fatigue and dirty troubles. For example, the simple motor is replaced by a numerical control motor, the traditional paper feeding is changed to vacuum suction paper feeding, and the ink feeding system has changed from manual ink control to program ink control. The cleaning of the surface of the rollers, the version, borrowing the rollers, rules, and correction are all replaced by fully automatic and semi-automatic manual operations.
3 multifunction
Another trend in the development of offset presses is the combination of printing functions and the integration of printing technologies. At present, the main types of printing technology are offset printing, relief printing, gravure printing, flexo printing and screen printing. They have their own characteristics. Although they are developing and their standards are getting higher and higher, they cannot replace each other after all. Therefore, in order to achieve complementary functions and improve efficiency, the trend of different printing types of machines forming multi-functional equipment is becoming more and more obvious. offset printing). . In addition. In order to meet the needs of the market in an all-round way, offset presses are more serialized. In terms of format design, a variety of offset printing machines are available, and the materials involved in printed products are also more extensive. It can realize the ultra-large format direct printing of paper, plastic and micro corrugated cardboard, and even the printing of large transparent light box advertising materials, etc ...
4Offset printing connection
Although offset printing has gone through a hundred years and entered a mature development period, innovation has always been a vibrant source of offset printing and has become a driving force for the continued development of offset printing.
First of all, in terms of printing colors, there are more and more offset printing color groups, and the configuration is getting higher and higher. It is not surprising that an offset printing machine plus an optical unit can reach 11 units. The connection of glazing in packaging printing is becoming more and more popular. , And become a packaging and printing fashion. The high configuration of the equipment has given flexible and value-added elements to the packaging offset printing, which has achieved a major breakthrough in printing effects. For example, partial varnish, reverse varnish, gold and silver varnish, pearl varnish, water-based varnish, protective varnish, and wipe, foam or odor varnish can be achieved.
Second, the rise of on-line processing technology for offset presses has made offset printing vibrant. The on-line cutting device is a highlight of the offset printing machine. This is that the sheet-fed offset printing machine can also use roll paper, which reduces the raw material cost by 20%. Some sheet-fed offset printing units are equipped with an imprint on the cylinder The cutting device can be used for wire-cutting the printing.
On-line hot stamping is to add a cold stamping device behind the offset printing unit. The hot stamping foil is wound on the blanket cylinder, and the graphics and text coated with the adhesive are bonded to the hot stamping foil by the counter pressure of the blanket cylinder and the impression cylinder
Assemble the die-cutting and indentation plate on the last machine of the offset press, which can be connected to the post-press forming process. Many machines are equipped with online punching holes, online numbering devices, and even a corona treatment unit. Plastic, thin wax, bump film and other materials with low adhesion on the printed surface.
Connection detection is to install a camera on the last color group of the printing press to perform video detection on the printed matter.It can detect the quality of each printed sheet under the high-speed operation of the offset press.At the same time, it can also detect the printed sheet size. Detect printing color density, overprint, etc. This connection detection device reduces the printing waste rate.
Digital technology has sneaked into printing technology, making the dream of offset presses a reality. With the help of JD, offset printing technology has entered a new era.
To sum up, the future offset printing can be called high-tech offset printing, its technological content will become higher and higher, and its dependence on experience will become lower and lower, which puts forward a higher technical quality for offset press operators Claim.
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