The development and introduction of modern printing presses are generally made up of such institutions as printing, inking, embossing, paper folding, and so on. Its working principle is: first, to be printed words and images to make plate, installed on the printer, then by artificial or printing ink coating on the plate there is words and images, and then directly or indirectly, transfer to the paper or other substrates, such as textile, metal, plastic, leather, wood, glass and ceramics), so as to reproduce the same as the plate of the print.
The development and introduction of the printing press.
Before the 1950s, the traditional letterpress printing process dominated the printing industry, and the printing press was dominated by letterpress printing presses. However, there are disadvantages of high labor intensity, long production cycle and pollution environment. Since the 1960s, the lithographic printing process with short period and high productivity has been developed and developed, and the lithographic printing of lead alloy is gradually replaced by offset printing. Soft relief printing, pore plate printing, electrostatic printing, ink jet printing and so on, in the packaging and printing, advertising printing has also been developed. The world printing machinery has made great progress since the 1980s. Over the past 20 years, the development of printing machinery has gone through three stages:
The first stage is the beginning of 1980 s to the early 90 s, this phase is the heyday of offset printing process development. This period of sheet-fed offset printing speed for the largest 10000 printed/hour. A four-colour press is usually about two hours before printing. The automatic control of the printing press is mainly focused on automatic paper, automatic paper collecting, automatic cleaning, automatic detection of ink color, automatic control of ink quantity and automatic control of the set. In addition to the monochrome, double color conversion, this period also has almost every sheet-fed offset press manufacturers in four-color machine manufacturing capabilities, most manufacturers are able to make paper flip agencies, double-sided printing.
The second stage is from the early 1990s to the end of the 20th century. In the 1990s, with the single sheet offset printing press as the symbol, the international printing machinery design and manufacturing level has taken a big step forward. Compared with the first stage of the model, a new generation of models to further improve the speed of the, by the 10000 printed/hour to 15000 / hour, prepress preset adjustment time also by the first phase of the 2 hours shorten for 15 minutes. The automation level and production efficiency of the machine have also been greatly improved.
Since the beginning of the 21st century, printing machinery has ushered in a third stage of development. Sheet-fed offset press some models can reach 17000-18000 / hour, but manufacturers don't hankers after the printer printing speed increases, the largest but through the application of information technology, further shorten the prepress preparation time and replace live a time to pursue a higher production efficiency.