Modern offset presses should be classified into sheet-fed offset presses and web offset presses depending on the type of paper they are printed on. Therefore, their level and development should be described separately.
First, the level and development of sheetfed offset presses
1. High printing speed
At present, when we measure the level of an offset press, the first thing that comes to mind is the level of printing speed, because high-speed printing machines can print high-quality prints only if the machine has good mechanical properties, and achieve the purpose of increasing productivity. The printing speed of modern offset presses has reached 1,500 sheets/hour, such as Heidelberg CD102, Manroland 700, KBA Rapida 105, and Komori Lisä Dragon 40, and domestic Beiren Group's BEIREN104 and Shanghai Goss YP4104. They all represent the development level of offset presses at home and abroad, and are recognized by the majority of users as high-quality offset presses. What is even more gratifying is that the printing speed of the KBA Rapida 72K two-color offset press has reached 20,000 sheets/hour. Therefore, with the application of advanced technology and the optimized design of the structure, the printing speed of the offset printing press will continue to increase.
2. Consensus of machine structure design
With the development of multicolor offset printing presses, the modular design of the unit is the development of modern offset presses. They can arrange the number of units and glazing, drying and cooling devices according to the needs of users. The need to make the machine more versatile, thus expanding the scope of use of the machine, has won the welcome of customers. Over the years many companies at home and abroad with the continuous increase in the printing speed of offset press, correspondingly improved or redesigned a new model, throughout the main points of consensus of the modern offset press design is 1 using double diameter impression cylinder and pass Paper roller (or 3 times), its purpose is to reduce the number of paper transfer to ensure the accuracy of overprinting, in order to reduce the transfer of the transfer error occurs, while the double-diameter impression roller printing paper bending is small, to provide printing thick paper The favorable conditions allow a machine to print both thin and thick paper, thereby expanding the scope of the machine's printing. 2 Adopt the hem type delivery paper and the front regulation mechanism. In order to adapt to high-speed printing, to ensure the smoothness of the movement of the paper-feeding mechanism and the accuracy of the formerly specified position, the impact of the pendulum-type delivery mechanism is small, and the front hem of the lower hem has sufficient positioning time. Therefore, the above high-speed offset printing presses (except Komori) are all adopted. The hem mechanism. 3 more than the use of suction belt feeding speed of the feeding device. In the process of high-speed printing and feeding, when the front edge (biting) of the paper reaches the front gauge, impact and bounce are generated, affecting the positioning accuracy of the front gauge. Therefore, when the paper is separated and conveyed by a modern high-speed offset printer, The suction belt sucks the paper and realizes the variable-speed conveying of the paper, that is, when the principle of the paper is advanced, the speed is increased, and the speed becomes slower when approaching the front gauge, so that the paper slowly contacts with the front gauge, eliminating the impact and rebound of the paper on the front gauge. , improve the accuracy of the former regulatory position. 4 pneumatic three-point suspension clutch pressure mechanism. The mechanism can reduce the difficulty of offset press processing and assembly, ensure the accuracy of the machine, reduce the noise of the machine, be suitable for environmental protection, and improve the smoothness and service life of the offset press.
3. Has become a road to automation and integration
Since 1990, Heidelberg offset press launched the full digital technology-based CP window machine remote control technology, the major manufacturers have successively designed advanced control systems as the development direction, so far, modern offset presses have automatic control systems, such as Manroland 700 type PECOM, KBA Rapida 104 type Cola MC, Mitsubishi F type COMRAC, Komori pressstation, etc. They all have automatic ink balance control, automatic print quality control, paper size preset control, automatic or semi-automatic The automatic control of the upper plate and the function of automatic cleaning of the ink roller, rubber blanket and impression cylinder, as well as the function of non-stop feeding and paper collection, all-digital electronic display system that controls, monitors and diagnoses the machine at any time.
Now at the Drupa 2000 exhibition, Heidelberg took the lead in introducing the CP2000 offset press center control technology, which represents the integration of offset printing presses. It uses a TFT-free ultra-thin screen display technology with no mouse or keyboard. CP2000's supporting technologies include prepress interface technology, print job pre-connection technology, image control technology (for quality control of the printing process), print color management system, online help system and management information system. Image control and color management systems have formed a new type of quality control model under the conditions of integrated printing. Management information and online help system are technical guarantees for printing companies to develop across regions. Therefore, CP2000 is the control center of Heidelberg offset press. It not only connects Heidelberg offset presses from the paper feed to the various subsystems of the delivery device, but also is the basis for the printing integration of Heidelberg offset presses. Undoubtedly, CP2000 represents the development direction of today's offset press.
4. Direct imaging offset printing technology has matured
As we all know, since the Durpmaster D146-4, the first direct image offset press, was exhibited at Drupa Exhibition Shanghai in 1990, it fills the gap between traditional offset printing presses and digital presses. With the market demand, Heidelberg introduced the Speedmaster 74DI direct image offset press at the 1998 Birmingham Fair in the United Kingdom. The increase in printing format indicates the mature application of direct imaging technology. Both CP windows and CPC control systems in Heidelberg are used on the above machines. They have been recognized by users both at home and abroad and occupy the market share of offset printing. At the Drupa 2000 exhibition, Komori Japan also exhibited the first Offset size (40 inch, 720×1030mm) Direct Projector Offset Project D model with a print speed of 18,000 sheets/hour. Japan's Akiyama also exhibited a JPrint double-sided five-color offset press with a print size of 40 inches. For this reason, it can be seen that direct or offset press technology has entered a mature period. In the near future, it will change the pattern of sheet-fed offset presses and will also accelerate the digitalization of commercial printing.
Second, the level and development of web offset press
Web offset presses can be divided into three categories depending on the purpose. One is a web offset press for newspapers, the other is a web offset press for books and journals, and the third is a commercial web offset press, due to the quality of prints. The different requirements, the machine accuracy and the level of control used ink properties are also different. They all have paper supply, printing, folding cutting units.
1. The consensus of modular structure design
Looking at the domestic and international web offset presses, the drums are arranged in H-type, Y-type, U-type and I-type. They all become independent printing units. Each manufacturer will combine them differently and become their own machine characteristics. Therefore, different color groups of web offset presses can be formed according to the requirements of users. At present, the selection of the diameter and the web of the cylinder has attracted the attention of the manufacturer for the double-width single-diameter cylinder. This machine has a print speed of 70,000 revolutions/hour - 80,000 revolutions/hour, and the production capacity is comparable to that of a double-diameter cylinder offset press, and can reduce the height of the machine. It will be an optimal solution for web offset printer designers.
2. Application of a mature control system for sheetfed offset presses
At present, many manufacturers use the automatic control technology that has been maturely used in sheet-fed offset printing presses on web offset printing presses. Makes the web offset press automation increase rapidly. In particular, the application of the automatic upper/lower printing device in the web offset printing machine enables the machine to change the plate in the case of continuous paper, which facilitates the operation without stopping the machine, reduces the waste of the paper, and reduces the labor intensity of the operator, significantly. Improve the efficiency of the machine.
3. More seamless and narrow seam roller technology
Reducing or removing the notch of the drum can reduce and eliminate the impact vibration during operation of the drum, and can improve the quality of the printed product and prolong the service life of the machine. This technology has been applied in web offset presses produced by many manufacturers. This technology has been adopted in Drupa 2000-displayed machines such as Heidelberg MAINSTREAM 80, Manroland RIGEOMAN, KBA PRISMA, etc. This marks seamless and narrow Sewing technology has entered a mature period, it will be used by more and more manufacturers.
4. The rapid development of shaftless transmission technology
With the rapid development of electrical and electronic technology, a fundamental revolution has been brought to the mechanical transmission of offset presses. The shaft and gear transmission of traditional offset presses have been replaced by motors, electronic cams, and electronic gearboxes. At present, many web offset presses use shaftless transmission. For example, KAO's COMET, Gauss's NEWSLINER, Pramer's UNISET 70, Hamada's CROWIN-β, and Vita's Model 370 offset presses all use shaftless transmission technology. Compared with the shaft drive, the shaftless drive can reduce materials, reduce manufacturing costs, reduce mechanical vibration, reduce noise, improve print quality, and can reduce auxiliary time and have the flexibility of production. For this reason, the technology was quickly adopted by the manufacturers of web offset printing machines. It is easy to see that, with the mature development of the technology, web offset printing machines with no shaft drive take up the market of web offset printing presses.
5. New Technology for Waterless, Keyless Newspaper Printing
At the Drupa 2000 exhibition, the CORTIMA newspaper printing machine exhibited by KBA was the first to apply waterless offset ink-jet printing technology to newspaper printing. Since the machine uses a waterless plate, it also uses an ink-less ink inking device. , It uses an anilox roller to realize the technology of ink transfer and ink distribution. It does not require ink adjustment in color newspaper printing, which saves time and reduces rejects. Waterless offset printing eliminates the environmental pollution of alcohol in compliance with environmental requirements.
Direct Imaging Technology Applied to Web Offset Press
The direct imaging web offset press - MAN Roland's DICOWeb debuted at the Drupa 2000 exhibition, which attracted attention. The machine adopts Roland's mature sleeve technology (plate cylinder and blanket cylinder). A sleeve is mounted on the plate cylinder. The printing image is directly imaged on the sleeve. The sleeve can be replaced after imaging for hundreds of times. The use of shaftless, gearless transmission and waterless printing on Roland DICO Web offset printing machine can print resolutions of 3200dpi on A2 format paper, with up to 30,000 prints, suitable for printing ranges from 1000 to 20,000 copies. The speed is 3.5 meters/second. Therefore, this machine is a new member of the web offset press, and it is also the leading machine for digital printing of the web offset press.
Third, the development of environmentally friendly offset printing presses
During the Drupa 2000 printing exhibition, the German Health and Safety Commission and European authoritative environmental protection agencies passed the KBA Rapida 105 five-color offset press into the first printing equipment to receive the environmental protection certificate of the true green environmental protection model of sheetfed offset printing. machine. The machine uses a low-alcohol and alcohol-free Varipad continuous alcohol moisturizing device.
The naming of environmentally friendly offset presses means that the environmental protection requirements in the design of offset presses are mentioned on the agenda. It also points out that environmental protection offset presses will be issues that offset press manufacturers in the 21st century must consider. Therefore, in the future offset press design, it should be noted that ink, alcohol, dusting, ultraviolet light, noise, etc. have an impact on the physical and mental health of operators and environmental protection. It can be foreseen that environmental protection will also become a measure of the advantages and disadvantages of offset presses. One of the conditions.
First, the level and development of sheetfed offset presses
1. High printing speed
At present, when we measure the level of an offset press, the first thing that comes to mind is the level of printing speed, because high-speed printing machines can print high-quality prints only if the machine has good mechanical properties, and achieve the purpose of increasing productivity. The printing speed of modern offset presses has reached 1,500 sheets/hour, such as Heidelberg CD102, Manroland 700, KBA Rapida 105, and Komori Lisä Dragon 40, and domestic Beiren Group's BEIREN104 and Shanghai Goss YP4104. They all represent the development level of offset presses at home and abroad, and are recognized by the majority of users as high-quality offset presses. What is even more gratifying is that the printing speed of the KBA Rapida 72K two-color offset press has reached 20,000 sheets/hour. Therefore, with the application of advanced technology and the optimized design of the structure, the printing speed of the offset printing press will continue to increase.
2. Consensus of machine structure design
With the development of multicolor offset printing presses, the modular design of the unit is the development of modern offset presses. They can arrange the number of units and glazing, drying and cooling devices according to the needs of users. The need to make the machine more versatile, thus expanding the scope of use of the machine, has won the welcome of customers. Over the years many companies at home and abroad with the continuous increase in the printing speed of offset press, correspondingly improved or redesigned a new model, throughout the main points of consensus of the modern offset press design is 1 using double diameter impression cylinder and pass Paper roller (or 3 times), its purpose is to reduce the number of paper transfer to ensure the accuracy of overprinting, in order to reduce the transfer of the transfer error occurs, while the double-diameter impression roller printing paper bending is small, to provide printing thick paper The favorable conditions allow a machine to print both thin and thick paper, thereby expanding the scope of the machine's printing. 2 Adopt the hem type delivery paper and the front regulation mechanism. In order to adapt to high-speed printing, to ensure the smoothness of the movement of the paper-feeding mechanism and the accuracy of the formerly specified position, the impact of the pendulum-type delivery mechanism is small, and the front hem of the lower hem has sufficient positioning time. Therefore, the above high-speed offset printing presses (except Komori) are all adopted. The hem mechanism. 3 more than the use of suction belt feeding speed of the feeding device. In the process of high-speed printing and feeding, when the front edge (biting) of the paper reaches the front gauge, impact and bounce are generated, affecting the positioning accuracy of the front gauge. Therefore, when the paper is separated and conveyed by a modern high-speed offset printer, The suction belt sucks the paper and realizes the variable-speed conveying of the paper, that is, when the principle of the paper is advanced, the speed is increased, and the speed becomes slower when approaching the front gauge, so that the paper slowly contacts with the front gauge, eliminating the impact and rebound of the paper on the front gauge. , improve the accuracy of the former regulatory position. 4 pneumatic three-point suspension clutch pressure mechanism. The mechanism can reduce the difficulty of offset press processing and assembly, ensure the accuracy of the machine, reduce the noise of the machine, be suitable for environmental protection, and improve the smoothness and service life of the offset press.
3. Has become a road to automation and integration
Since 1990, Heidelberg offset press launched the full digital technology-based CP window machine remote control technology, the major manufacturers have successively designed advanced control systems as the development direction, so far, modern offset presses have automatic control systems, such as Manroland 700 type PECOM, KBA Rapida 104 type Cola MC, Mitsubishi F type COMRAC, Komori pressstation, etc. They all have automatic ink balance control, automatic print quality control, paper size preset control, automatic or semi-automatic The automatic control of the upper plate and the function of automatic cleaning of the ink roller, rubber blanket and impression cylinder, as well as the function of non-stop feeding and paper collection, all-digital electronic display system that controls, monitors and diagnoses the machine at any time.
Now at the Drupa 2000 exhibition, Heidelberg took the lead in introducing the CP2000 offset press center control technology, which represents the integration of offset printing presses. It uses a TFT-free ultra-thin screen display technology with no mouse or keyboard. CP2000's supporting technologies include prepress interface technology, print job pre-connection technology, image control technology (for quality control of the printing process), print color management system, online help system and management information system. Image control and color management systems have formed a new type of quality control model under the conditions of integrated printing. Management information and online help system are technical guarantees for printing companies to develop across regions. Therefore, CP2000 is the control center of Heidelberg offset press. It not only connects Heidelberg offset presses from the paper feed to the various subsystems of the delivery device, but also is the basis for the printing integration of Heidelberg offset presses. Undoubtedly, CP2000 represents the development direction of today's offset press.
4. Direct imaging offset printing technology has matured
As we all know, since the Durpmaster D146-4, the first direct image offset press, was exhibited at Drupa Exhibition Shanghai in 1990, it fills the gap between traditional offset printing presses and digital presses. With the market demand, Heidelberg introduced the Speedmaster 74DI direct image offset press at the 1998 Birmingham Fair in the United Kingdom. The increase in printing format indicates the mature application of direct imaging technology. Both CP windows and CPC control systems in Heidelberg are used on the above machines. They have been recognized by users both at home and abroad and occupy the market share of offset printing. At the Drupa 2000 exhibition, Komori Japan also exhibited the first Offset size (40 inch, 720×1030mm) Direct Projector Offset Project D model with a print speed of 18,000 sheets/hour. Japan's Akiyama also exhibited a JPrint double-sided five-color offset press with a print size of 40 inches. For this reason, it can be seen that direct or offset press technology has entered a mature period. In the near future, it will change the pattern of sheet-fed offset presses and will also accelerate the digitalization of commercial printing.
Second, the level and development of web offset press
Web offset presses can be divided into three categories depending on the purpose. One is a web offset press for newspapers, the other is a web offset press for books and journals, and the third is a commercial web offset press, due to the quality of prints. The different requirements, the machine accuracy and the level of control used ink properties are also different. They all have paper supply, printing, folding cutting units.
1. The consensus of modular structure design
Looking at the domestic and international web offset presses, the drums are arranged in H-type, Y-type, U-type and I-type. They all become independent printing units. Each manufacturer will combine them differently and become their own machine characteristics. Therefore, different color groups of web offset presses can be formed according to the requirements of users. At present, the selection of the diameter and the web of the cylinder has attracted the attention of the manufacturer for the double-width single-diameter cylinder. This machine has a print speed of 70,000 revolutions/hour - 80,000 revolutions/hour, and the production capacity is comparable to that of a double-diameter cylinder offset press, and can reduce the height of the machine. It will be an optimal solution for web offset printer designers.
2. Application of a mature control system for sheetfed offset presses
At present, many manufacturers use the automatic control technology that has been maturely used in sheet-fed offset printing presses on web offset printing presses. Makes the web offset press automation increase rapidly. In particular, the application of the automatic upper/lower printing device in the web offset printing machine enables the machine to change the plate in the case of continuous paper, which facilitates the operation without stopping the machine, reduces the waste of the paper, and reduces the labor intensity of the operator, significantly. Improve the efficiency of the machine.
3. More seamless and narrow seam roller technology
Reducing or removing the notch of the drum can reduce and eliminate the impact vibration during operation of the drum, and can improve the quality of the printed product and prolong the service life of the machine. This technology has been applied in web offset presses produced by many manufacturers. This technology has been adopted in Drupa 2000-displayed machines such as Heidelberg MAINSTREAM 80, Manroland RIGEOMAN, KBA PRISMA, etc. This marks seamless and narrow Sewing technology has entered a mature period, it will be used by more and more manufacturers.
4. The rapid development of shaftless transmission technology
With the rapid development of electrical and electronic technology, a fundamental revolution has been brought to the mechanical transmission of offset presses. The shaft and gear transmission of traditional offset presses have been replaced by motors, electronic cams, and electronic gearboxes. At present, many web offset presses use shaftless transmission. For example, KAO's COMET, Gauss's NEWSLINER, Pramer's UNISET 70, Hamada's CROWIN-β, and Vita's Model 370 offset presses all use shaftless transmission technology. Compared with the shaft drive, the shaftless drive can reduce materials, reduce manufacturing costs, reduce mechanical vibration, reduce noise, improve print quality, and can reduce auxiliary time and have the flexibility of production. For this reason, the technology was quickly adopted by the manufacturers of web offset printing machines. It is easy to see that, with the mature development of the technology, web offset printing machines with no shaft drive take up the market of web offset printing presses.
5. New Technology for Waterless, Keyless Newspaper Printing
At the Drupa 2000 exhibition, the CORTIMA newspaper printing machine exhibited by KBA was the first to apply waterless offset ink-jet printing technology to newspaper printing. Since the machine uses a waterless plate, it also uses an ink-less ink inking device. , It uses an anilox roller to realize the technology of ink transfer and ink distribution. It does not require ink adjustment in color newspaper printing, which saves time and reduces rejects. Waterless offset printing eliminates the environmental pollution of alcohol in compliance with environmental requirements.
Direct Imaging Technology Applied to Web Offset Press
The direct imaging web offset press - MAN Roland's DICOWeb debuted at the Drupa 2000 exhibition, which attracted attention. The machine adopts Roland's mature sleeve technology (plate cylinder and blanket cylinder). A sleeve is mounted on the plate cylinder. The printing image is directly imaged on the sleeve. The sleeve can be replaced after imaging for hundreds of times. The use of shaftless, gearless transmission and waterless printing on Roland DICO Web offset printing machine can print resolutions of 3200dpi on A2 format paper, with up to 30,000 prints, suitable for printing ranges from 1000 to 20,000 copies. The speed is 3.5 meters/second. Therefore, this machine is a new member of the web offset press, and it is also the leading machine for digital printing of the web offset press.
Third, the development of environmentally friendly offset printing presses
During the Drupa 2000 printing exhibition, the German Health and Safety Commission and European authoritative environmental protection agencies passed the KBA Rapida 105 five-color offset press into the first printing equipment to receive the environmental protection certificate of the true green environmental protection model of sheetfed offset printing. machine. The machine uses a low-alcohol and alcohol-free Varipad continuous alcohol moisturizing device.
The naming of environmentally friendly offset presses means that the environmental protection requirements in the design of offset presses are mentioned on the agenda. It also points out that environmental protection offset presses will be issues that offset press manufacturers in the 21st century must consider. Therefore, in the future offset press design, it should be noted that ink, alcohol, dusting, ultraviolet light, noise, etc. have an impact on the physical and mental health of operators and environmental protection. It can be foreseen that environmental protection will also become a measure of the advantages and disadvantages of offset presses. One of the conditions.
Temporary Hair Dye Use to enhance tones, refresh existing color, or play with fashion shades. Nourishing color is designed to fade out gradually over time. It works on Bleached hair directly. No need color developer.
Temporary hair color shampoo Flamingo Pink
DELIN HAIR COSMETICS , https://www.hairdyecolorfactory.com