Brief introduction of imported import sheetfed offset presses

Germany's "Man Rowland", "Heidelberg", "Kaobao", Japan's "Komori", "Mitsubishi" these five international brands of modern sheetfed offset press are with its excellent structural performance, excellent machine configuration And reasonable cost performance has won the favor of many printing companies. The five major brand offset presses performed well in maintaining print quality stability, shortening job preparation time, reducing paper waste, adopting digital processes, and increasing production efficiency. However, their respective technical parameters, structural design, and organizational configuration have their own strengths, which provides printing companies with flexible and active choices.

First, the basic technical parameters (for example, four-color folio)

1, the highest printing speed

In 1986, the first German KBA Rapida split sheet-fed offset printing machine RAPIDA105 hit the world with a printing speed of 15,000 images per hour. Today, this speed has been exceeded by the five major brand offset presses and reached the State General Administration of Customs. Requirements for tax-free imported sheetfed offset presses, such as: Heidelberg CDL02 up to 15,200 sheets per hour; Roland 700, KBA Rapida RAPIDA05, Komori Lithrone

The S40 and Mitsubishi Diamond MOND3000 can reach 16,000 pieces/hour. Of course, in actual production, based on factors such as ink characteristics, paper properties, blanket properties, and distribution of printing screens, as well as equipment maintenance and maintenance requirements, the general speed is only about 13,000 sheets/hour, and various models can Satisfy stable speed performance.

2, the largest printing area and the smallest paper size To boot, for example, the five brand offset presses are designed in accordance with standard paper, can meet the printing of the off-page paper format. It is worth mentioning that Heidelberg's maximum print area for boot varies according to the loading method. In the case of rapid loading, the maximum printing area is slightly reduced in the width direction, which is 7001020mm; in the case of automatic loading, the maximum printing area is 7101020mm, and both sizes are standard sizes, but the price of the configured loading system is much different. The maximum printing area of ​​KBA Rapida 105 common models is 7101030mm; if a device with an increased size is equipped, the maximum printing area can reach 7501050mm. This device is very practical for some users who are engaged in packaging business. In the printing of parts, the minimum paper width is also a parameter worth considering, generally around 360520mm, Roland 700 minimum paper format up to 340480mm, Heidelberg CDl02 minimum paper format even up to 280420mm, provides a downward development for small-size printing Space, so as not to waste paper trim.

3, pile height

The Feida paper stack height and take-up paper stack height of the five brand offset presses can all reach about 1,100 mm. KBA Rapida 105 Feida Paper Stack height and take-up pile height can both reach 1300mm, and can provide the necessary accessories for 375mm or 600mm machine height, so that the paper stack height reaches 1675mm or 1900mm. Suitable for thick cardboard printing. Taking 450 g and 0.6 mm thick cardboard as an example, a 1100 mm paper stack can contain approximately 2,000 sheets (1100/0.6=1830 sheets), which can be used for normal printing for about 10 minutes (60x).

2000/12000 = 10 minutes). A tall pile of paper can increase the capacity of the paper without having to frequently replace the pile of paper and thus have enough time to control the quality of the print.

Of course, piles of paper are too high for operation and observation. Moreover, each company also comes standard with a non-stop paper change device at Feida, and an optional pre-installed paper device. Therefore, for ordinary commercial printing and book printing, a stack height of 1100 mm is sufficient.

4, paper thickness

The five brand offset presses can print from 0.04 mm thin paper (40 g/m2) to 1.0 mm thick paperboard (650 g/m2). The difference is:

Mitsubishi has introduced three different models for different thicknesses of paper. The thickness of the standard printed diamond DIAMOND 3000LS paper is 0.04 to 0.6 mm (approximately 40 g/m2 to 450 g/m2). When printing over 450 g/m2, the bite force needs to be manually adjusted. The standard configuration of the diamond DIAMOND 3000 LC type plate printing machine can print paper in the range of 0.2 to 0.8 mm (about 150 g/m2 to 550 g/m2). Within this range, the bite force automatically adapts to the paper thickness requirement. The multi-function diamond DIAMOND3000LX offset press adopts a separate vacuum chamber and a simple transfer drum for each printing unit. The printing thickness can be adjusted from 0.04 to 1.0 mm (about 40 g/m2 to 650 g/m2). Paper. At present, Mitsubishi is launching the diamond DIAMOND 3000LS offset press for the Chinese market.

For cardboard printing, KBA has a device that is optional and can print 1.2 mm (approximately 800 g/m2) of cardboard, including F-corrugated cardboard.

From a practical point of view, printing paper with 0.15 ~ 0.3 mm (about 120g/m2 ~ 350g/m2) is the most commonly used, the printing stability is also the highest, especially thin and special thick paper can easily affect the printing speed and effect, like 1.0

More than a millimeter of cardboard often uses a traditional double-sheet paste. In addition, the same offset printing machine should not be printed alternately with thick and thin paper. Frequent machine adjustment is not conducive to the stable control of printing quality, and it is not conducive to the maintenance of the printing press. Therefore, it is recommended that powerful printers can fix papers of different thicknesses on different machines, or purchase thick paper printers such as the Heidelberg CD series and thin paper printers such as the Heidelberg SM series in order to increase the service life of the machines. , Stable printing quality.

5, overprint accuracy

In the case of ideal paper properties, ink properties, blanket properties and various printing conditions, the five brand offset presses can achieve an overlay accuracy of ≤ 0.01 mm, which can meet 0.3% of the 10 micron FM network and 175 lines/inch amplitude modulation network. Perfect reproduction of left and right outlets.

In actual printing, there are many factors that limit the accuracy of overprinting, and can reproduce 3% of the 175 lines/inch amplitude modulation network, which is a fine product. Therefore, the five major brand offset presses have outstanding performance in satisfying the overprinting precision requirements for high-end fine products.

Second, the computer control section

At present, the rapid development of computer technology, sensors, and PLC programmers makes the automation of five major brand offset presses very high. Every machine has an intelligent control center with controllable human-machine dialogue. Specifically: Manroland has PECOM, Heidelberg has CP2000, KBA has OPERA, Mitsubishi has IPCII, Komori has PAI. This type of printing control center has the ability to interpret and process all kinds of data through a digital network. Under the dialog box of the color display, the operation settings of the printing press can be easily completed.

For example, the control center can automatically set and adjust the position of the feeder, the air volume of the suction blower, and the side gauge according to the data related to the substrate, such as paper type, size, and thickness, provided by the center console. Pull the paper positioning position, pressure gauge height and printing pressure; can determine the ink key setting according to the amount of ink related to the print provided by the center console, directly obtain accurate ink preset, fountain solution preset; according to India The number of presets is automatically realized until the number of stops. Heidelberg offset press can turn on the sampling green lamp at the time of sampling after the speed is fixed, and the Roland offset press can automatically take samples according to the set number of samples. If it is a duplicate print, the center console can extract the previously printed control data from its internal memory or external memory and provide it to the control center to pre-set the various printing presses; prepress data such as digital proofing or CTP plate making is transmitted via the network. Or the external magnetic card is inserted into the pre-press data interface of the offset printing press, and the control center reads the job data from it to pre-set the various mechanisms of the printing press, thereby reducing the preparation time of the production operation. The memory capacity of each offset printing machine can have 100 to 250 customer profiles, and the external storage capacity can have about 5,000 customer profiles, and all of them have digital connection interfaces such as CIP3 interfaces for the extended prepress management system. CIP4 interface, these interfaces can be used to connect with prepress equipment and postpress equipment, realize online transmission pre-setting, can also be used to realize the network management of printing plants, and can also perform off-site network printing, which is the realization of modern printing presses. A digital, networked window.

Another example: the operator can automatically correct the up-down, left-right, and diagonal error of the printing plate at the center console position according to the type and data of overprinting that are not available in the color display “Printing Fault Display and Diagnosis Function” dialog box; The paper-feed monitor can track the running of the paper and automatically correct the misaligned paper according to the paper-feeding error; according to the print quality on the proof sheet, the print pressure is automatically adjusted. It should be noted that: After 2003, various brands of machines in order to comply with the market's need for automatic control of offset presses, in the latest offset presses, intelligent control centers are new models with LCD display and corresponding digital latest technology The centralized console, equipped with a dual-thin-film transistor touch panel, can realize centralized control by reading the external data required by the CIP4 to the real-time operation status of the printer. However, the software configuration of each control center is not the same, the price is not the same, the user must make it clear when the machine is equipped with its intelligent control center model and price match.

The application of the computer automatic control system on the offset printing press represents the current level of development of offset presses and reflects the coordination of people and printing presses.

Third, the paper section

The paper-feeding parts of the five major brand offset presses have their own characteristics, thus reflecting their respective paper-feeding properties, and thus affecting their respective machine performances.

1, the number of paper suction nozzle and feeding nozzle only a few

Single-color offset printing press and two-color offset press There are only two paper feeding nozzles and feeding nozzles in the feeder mechanism, which are commonly called “two mentions and two deliveries” and can adapt to conventional paper and printing under 8,000 sheets/hour. However, the five major brand offset presses are more suitable for the printing of paper, and the speed of the machines is inconceivable. The demand is 15,000 sheets per hour or more. Therefore, it is very important to ensure the speed, accuracy, and stability of the paper separation. Now. The five major brand offset presses use four paper suction nozzles to improve the efficiency of paper separation. However, there are differences in the number of feed nozzles, such as Komori, Mitsubishi, Heidelberg machines are equipped with 4 paper suction nozzle, referred to as "four mention four get"; KBA is equipped with six feeding nozzle, referred to as " Four to six to send; Roland equipped with eight feeding nozzles, referred to as "four mention eight sent." Theoretically speaking, the paper feeding nozzle should be as good as possible, especially when printing thick paper, the suction power of the entire surface of the paper is sufficient and uniform, and the straightness and stability of the paper can be ensured at high speed. However, there are many suction nozzles, many spare parts, and the coordination requirements between institutions are also high. The winds should be of the same size, the nozzle height must be the same, the degree of wear should be uniform, and the action moments must be matched. Otherwise, the speed If the height of the paper is poor, or if the nozzle is leaking, one nozzle does not absorb the paper, which directly causes the paper feed to be skewed and other faults. Therefore, we must rationally choose the number of nozzles according to the product structure.

2, paper conveying mechanism

There are two types of paper conveying mechanisms for the five brand offset presses. One is a conveyor type paper conveying mechanism; the other is a vacuum suction type paper conveying mechanism. Both types of agencies have their own lengths.

Conveyor type paper conveying mechanism arranges 4 to 6 conveyor belts symmetrically and symmetrically on the paper-feeding platen. The conveyor belt is symmetrically arranged with a paper-pressing roller, a paper-pressing brush, a paper-pressing brush wheel, and a paper ball. The pressure between the platen roller and the conveyor belt causes the paper to be conveyed to the front defined position under the guidance of the conveyor belt.

This kind of conveying way makes the paper on the paper-feeding platen always controlled by the pressure of the paper-pressing roller and other parts. The paper is stable and the structure is simple. It is especially suitable for the transmission of thin paper. However, the paper surface is prone to indentation, especially when there are ink layers on the paper; and improper adjustment of the pressure of the parts such as the platen roller and the wire belt may cause the paper feed to be skewed and the paper is not in place.