Summary
As we all know, there are five major printing press brands in the world, and these five brands are distributed in Japan and Germany. So what is the reason why these five brands are so concentrated? Looking back on history, these two countries provoked and participated in two world wars, and as a defeated country that has yet to be promoted, they rank among the developed countries with their strength. Germany and Japan seem to have become synonymous with first-class printing machinery. How is it done? My grandchildren's wisdom and hard work are not inferior to any nationality. Why can't we create a world-class printing press brand? Then, there must be a force that has not yet been discovered hidden in the blood of these two nations.
This article will dive deep into the veins of the spiritual and ideological fields to find those fossils that have not yet been discovered, to track and reveal how the Germanic and Yamato nations have created a first-class printing press brand. This article will analyze this belief from various levels, in order to "strive to improve one's skills" and firmly believe that one day, people will look up to the East with admiration, and they are extremely envious: "Look! That is China!"
Mission of faith
——The famous brand is made like this
Chapter One International Advanced Technology
As we all know, there are five major printing press brands recognized in the world: Heidelberg, Roland and KBA in Germany; and Mitsubishi and Komori in Japan.
First of all, let us feel the advanced technical characteristics of representative models of sheet-fed offset presses of foreign brands.
Section 1 Heidelberg Sheetfed Offset Press Technology
Heidelberg offset presses generally use step belt type standard paper feeding (for start-up) or vacuum suction belt type paper feeding (four open and eight start). The standard paper feeder has a stable structure and can be applied to a variety of printing materials Printing, and the suction belt conveying makes operation and adjustment convenient and quick; the paper table is raised in a stepless manner, which can change the height of the paper according to the actual thickness of the paper, so that the relative position of the suction nozzle and the stack of paper remains stable; hem The paper-type delivery teeth can ensure the simple delivery mechanism and convenient adjustment; the cylinder arrangement adopts the "seven o'clock" method for printing machines that use double-diameter impression cylinders, which can meet the requirements of the cylinder arrangement, facilitate paper transfer, and help print quality The improvement is especially suitable for the printing of thick cardboard substrates; the inking system uses 21 ink rollers arranged to meet the principle of "front weight and light weight", and can achieve rapid ink flow response; the dampening system is composed of 5 The root water roller is composed of a water bucket roller and an ink fountain roller, which are divided into zones, and a row of axially adjustable blowing fans are used to evaporate the excess fountain solution. The dampening device has an automatic speed compensation function, which can achieve fast water-ink balance and keep the water supply stable when the printing speed changes; the paper collection device adopts a blown paper guide stack, and the double-increasing powder spray device can make the paper stack stable and tidy, and can save 30 % Of powder sprayed.
In addition, Heidelberg is also making efforts to enhance the automation control capabilities of printing presses. From CPC ink remote control and registration system, CPTRONIC printing machine integrated control system to CP2000 printing machine automatic control system, it has realized the automatic monitoring and control of printing quality. By configuring a fully digital electronic display system, it is also possible to achieve integrated operation and management, which can achieve better product quality, shorter print preparation time, less press maintenance, and higher print output.
Section 2 Manroland Sheetfed Offset Press Technology
The Roland 700 standard printing press adopts a sway-type front gauge and a sling-type paper delivery tooth, which makes the paper conveying stable and accurate; the double-diameter impression cylinder reduces the number of paper transfers between multi-color units, greatly reducing the paper transfer error, and It can make the surface of the printed product smooth and reduce the deformation of the dots during imprinting; the use of "seven o'clock" cylinder arrangement allows the printing paper to be completely passed through the rubber cylinder before being handed over to the delivery cylinder, reducing the printing process due to the tail of the printed sheet The dot changes and overprinting problems caused by the paper transfer in the middle; the ink supply system uses a fast-response ink path system with only 16 ink rollers, the ink supply method uses the central ink supply method, and has a main ink channel "automatic grading adjustment "And" automatic separation of ink chain "function, with the characteristics of large ink roller diameter, good heat dissipation performance, suitable for high-speed printing; the wetting system uses the Roland Deltanmatic triangular wine-refining system to eliminate" ghost images "and reduce" white spots " "Has a good effect; the use of a" one-line "paper transfer device without a barrel body belly can prevent contact and smudging of the printed sheets, and there is no need to install anti-rubbing The mesh cloth is very convenient to operate, which is helpful to reduce the loss of printed products; the diagonal registration of the printing plate can be automatically adjusted by the eccentricity of the paper conveyor, without having to adjust the eccentricity of the printing plate cylinder, thereby reducing the waste of overprinting paper, It overcomes the parallelism deviation caused by the eccentric adjustment of the plate cylinder to the rubber cylinder and the plate ink roller.
The use of a large number of pneumatic control systems to replace traditional mechanical devices is a major feature of Manroland printing presses. It uses vacuum paperboard, variable speed suction belts and pneumatic side pull gauges, which greatly reduces the complexity of the mechanical structure, reduces the mechanical manufacturing and installation, The difficulty of debugging. The left and right positions of the paper stack and the closed position of the paper feeder can be accurately controlled by the position switch, thus ensuring the accurate registration position of the double-sided printing. In order to improve the automation of sheet-fed multi-color offset presses, improve printing quality, and reduce labor intensity, Manroland uses the PECOM control system, which can be used for electronic printing control and presetting. Enter the data of the paper web and paper thickness into the console during preparation of the prepress operation, and then you can automatically and accurately complete the front and back position of the feeder's feeder head, front regulation, side regulation, paper suction vacuum suction wheel, powder spraying device and Precise and quick pre-adjustment of printing pressure, etc., reduces preparation and downtime, and improves production efficiency. Manroland not only keeps making progress in the development of traditional offset printing equipment, but also has some accomplishments in digital printing. As can be seen from its independently developed DICO Web web digital offset press, Manroland combines traditional offset printing technology with modern digital printing Combining them organically opens up a new path for the development of offset printing technology.
Section 3 Technology of KBA Sheetfed Offset Press
KBA105 has a very high printing speed of 21,000 sheets per hour design speed. In addition to the currently popular hem-type paper transfer, hem-type front gauge, double-diameter impression cylinder, air-cushion paper transfer, automatic centering of the paper table, and pneumatic paper collection device, It also created the "four-lift six-feed" feeder. The blowing and suction nozzles can be electrically adjusted to make the adjustment faster and more convenient, and the paper feed is more stable and accurate. The vacuum paper feed can realize four-stage variable speed paper transfer , The four air chambers can ensure that the suction pressure is close to the end of the paper feeding table, and the air pressure at the end near the front gauge is zero, which realizes the speed change required for paper transfer; the pneumatic side pull gauge can achieve precise positioning, and the photoelectric control is used to pull the paper. Problems in place; the ultrasonic double-sheet detection device is very beneficial for thick paper, special printing materials and thick ink products; the inking device is a single ink path inking system with 5 different diameter plate rollers, and the ink channel can be drawn Bounce, to eliminate "ghost images", the number of ink rollers is small (15), and the diameter is large, which can realize rapid change of printing ink color, reducing paper waste and cleaning time; the wetting device adopts linear water transfer, which can simultaneously Used for ordinary wetting and alcohol wetting; paper transfer and impression cylinders adopt "anchor claw" teething, which can save the work of adjusting the row of teeth during the conversion of thick and thin paper during the printing process; Plate-up (with input box and plate-receiving box) or automatic plate-feeding (with plate-feeding box), which reduces downtime assistance time and improves production efficiency; the use of paper transfer rollers enables diagonal registration adjustment without the need for printing plates One side of the cylinder is skewed and shifted to ensure the accuracy of the printing press.
In order to increase the stability of the machine operation, improve the operation accuracy and ensure the printing quality, KBA105 also adopts the integral casting of the lower fuselage and the T-shaped wall panel installation method, which not only reduces the vibration of the machine, but also solves the problem of lubricant leakage.
Section 4 Komori Sheetfed Offset Press Technology
The paper feeding device of Komori printing machine adopts the design of eight suction nozzles, which can realize the stable conveyance of paper with a thickness of 0.04mm -0.8mm; the double-sheet and empty-sheet detection devices combined by mechanical, photoelectric and inductive types can be used for Control printing errors such as skew, double sheets, and empty sheets in the paper feeding process to ensure accurate paper conveyance; the paper delivery mechanism is equipped with an anti-scattering tail device on the swinging paper delivery shaft to compensate for the paper tail; the same double diameter Impression cylinder and double-diameter paper transfer cylinder can meet the requirements of printing materials and printing quality; the tooth shaft on the transfer paper cylinder adopts a large-diameter torsion bar tooth shaft, which can increase its strength, improve safety and stability. The paper tooth pad adjusting device can respond quickly to thick and thin paper, reducing the time for adjusting the machine; due to the use of a special cylinder with a deflection of ± 0.2mm, the diagonal registration of the printing plate can be adjusted by the printing plate cylinder The axial deflection is achieved; the ink transfer system uses a long ink path, relying on four different diameter form rollers and four ink channeling rollers to ensure uniform ink color of the printing plate; the water transfer system uses reverse water transfer Continuous water supply, may be provided directly to layout a stable, homogeneous fountain solution; delivery sheet with anti-skew device also has double sheet delivery apparatus in question can be automatically separated.
Section 5 Technology of Mitsubishi Sheetfed Offset Press
Mitsubishi sheet-fed offset printing presses mainly include F series, H series and diamond series. The printing speed of its 3F series offset presses is 13,000 sheets / hour. The maximum printing speed of 3H series and diamond 3000 series offset presses can reach 16,000 sheets / hour.
Mitsubishi Diamond (DIAMOND) 3000 series offset printing machine. 3. In addition to the widely used double-diameter impression cylinder, "seven o'clock" cylinder arrangement, and automatic and semi-automatic versioning, its Feida device uses simulation design technology and is optimized for design, which can achieve a variety of prescribed sizes. 5 sheets / second of smooth paper separation; adopts vacuum variable-speed paper feeding and vacuum paper feed adjustment to achieve stable paper feed and accurate handover; adopts new ink keys to reduce the contact between ink and ink fountain keys, making it sensitive and easy to react Cleaning; the ink flow shaking stop mechanism can ensure that the ink flow stops when the machine is idling, reducing waste sheets and mechanism wear during recovery printing; the use of the ink roller temperature control system can keep the temperature of the ink roller surface unchanged and reduce printed products Ink color deviation, stable printing quality; wetting system can carry out triple transformation to reduce printed ink color deviation and stabilize printing quality; wetting system can carry out triple transformation to adapt to various printing patterns required wetting method; reversing roller to hunt teeth The double-nagging structure can ensure high-precision nagging and turning; the paper collecting device adopts thick and thin dual-purpose vacuum deceleration paper collecting roller and paper collecting pneumatic chamber. Permit a variety of printed sheets can be stable charge, reducing the scratches and smudge.
In order to establish a digital workflow from the prepress system to the postpress processing system, Mitsubishi has developed the MAX-net system, which not only has the control function of the printing press, but also can be remotely networked with the factory and office, so as to master the printing equipment at any time Operation status, promptly find printing failures and quickly provide maintenance guidance.
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