The development direction of sheetfed offset printing machine: double-sided automatic printing
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In the past few decades, lithography has been a very important printing technology in the United States. Most of the prints in the United States today are still produced using plain printing. According to estimates by the US Department of Commerce, the total value of commercial print produced in the United States amounts to $74.8 billion annually, with prints produced using lithographic offset technology totaling $58.4 billion, or 75%. Currently, sheetfed offset press manufacturers are designing and manufacturing new types of equipment to meet the needs of the press market, and large flatbed presses have become popular. An important feature of the new screen printers is the increased degree of automation and direct imaging. A significant trend in the development of new screen printers is the adoption of color management techniques. As we entered the 21st century, the above trend pointed out the direction for the development of sheetfed offset lithography.
Automatic printing becomes the production standard
Recently, a survey published by the American Association of Printing and Publishing Technology Suppliers entitled "The Status and Future of the US Printing Machine Market" shows that most customers who purchase new printing presses put the function of automatic printing operations very important. The location. At present, important printing press manufacturers are striving to improve the performance of printing presses and regard automatic printing operations as the basic production standard to meet the needs of our customers. The latest presses have the following features: automatic alignment control, automatic adjustment of drum pressure and side gauges, automatic and semi-automatic loading, automatic cleaning of blanket cylinders and impression cylinders, and fully integrated color control panel. This allows the printer to reduce the tuning preparation time to 10-20 minutes. The sheet-fed offset press has a short preparation time and can print 15,000 sheets per hour. Therefore, the productivity of such a printing press is very high. An example of an innovative attempt at automatic printing operations in presses is the CPC 32 prepress interface device from Heidelberg. This device automatically pre-adjusts the ink keys based on the data provided by the pre-press processing RIP, eliminating the need to scan the plates. In addition, Heidelberg's CP 2000 color touch screen display (running in Windows NT) dynamically adjusts the press (including changing the alignment position and ink supply) in high-speed printing production. The CP 2000 stores the production data of 250 jobs in its standard memory for repetitive production of jobs. The automation of small presses is also increasing. As monochrome copier-type presses continue to be replaced by digital copy/printers, many press manufacturers are working to develop multi-color, highly automated compact presses.
Large scale printing machine trend
The manufacture of the largest sheetfed presses ever made has also led sheetfed printers to enter the traditional sanctuary of web printers. This large press, primarily manufactured in the packaging industry for the printing industry, enables sheetfed printers to achieve significant economic benefits in the production of high volume prints. The large-scale printing presses with outstanding performance include the Rapida 162 8 printing units produced by KBA and the 60-inch printing press; the Speedmaster 102-10-p 10 printing units produced by Heidelberg, the 40-inch printing press and Manroland The company produces 900 type 8 printing units and 56-inch printing presses. All of the above presses are double-sided presses, which can perform double-sided color printing at one time. The Speedmaster 102-10-p printing press produced by Heidelberg has an automatic printing operation function, the preparation time of the adjustment is very short, and the double-sided printing can further save production time. According to press manufacturers, these large sheetfed presses are currently selling well. Therefore, major printer manufacturers are likely to start producing 8--10 color double-sided printing presses in the next one or two years.
Direct imaging press
Today, many press manufacturers are selling offset presses with direct imaging capabilities that directly image the plates. The Speedmaster DI 74 type 4 printing press forms a complete range of fully automatic, direct printing functions.
Color management and lithographic offset press
Lithographic printers with direct imaging capabilities are ideal for ICC standards and color management workflows in the printing industry. For example, the 74 Karat press can print a sheet of the same number of ICC file standards after entering the appropriate program. For example, the proof sheets printed with SWOP ink can be used for print production after color matching processing: the offset documents based on the Euro standard can be used for the next print production after color matching. In addition, the 74 Karat press can be used with many proofing devices with the appropriate ICC files. As color management technology is further used in traditional offset printing production, new control devices such as CPC 24 developed by Heidelberg will play a significant role in the dynamic management of printing presses. The CPC 24 relies on a sheet-fed scanner/colorimeter to analyze the entire sheet without the use of various color scales. In this way, the CIE L*a*b* value measured from the printed image portion can be compared with the required CIE L*a*b* value. Then the corresponding adjustments are made to match the CMYK values to the required CIE L*a*b* values. With the use of colorimeter and ICC files (rather than densitometers) in digital prepress processing, traditional color scale control methods are likely to be eliminated. The use of color management technology in sheetfed press operations will have a profound impact on sheetfed production. In the traditional work of proofing by contrasting proofs, the proofs are considered standard, and the highly skilled printer operator adjusts the thickness of the ink layer on the press to achieve the same consistent printing effect. With the ColorSync color management workflow, the lithographic press automatically adjusts and calibrates the data based on pre-defined color profiles. There are fewer and fewer users using sample-contrast workflows, which will eventually result in the elimination of analog proofing solutions. Digital proofing, because of the accurate calibration of the printing press, can perform quality proofing processing within a moderate tolerance range, which will pave the way for the promotion and application of computer direct plate making technology.
The potential role of CIP3 technology
CIP3 technology (integration of prepress, printing and postpress operations) will soon have an impact on the sheetfed printing market. The CIP3 technology features the CIP3 Print Production Format (PPF) to input job parameters into digital prepress files for integration of prepress, print and postpress operations. For example, the prepress job preparation document will store data on the sheet size, ink supply amount, folding imposition, and finishing processing. As the job passes in the CIP3 workflow, the machine that is compatible with the PPF job format will automatically adjust the settings based on the data stored in the PPF job file. Many manufacturers of prepress processing equipment, printing equipment and finishing equipment have agreed to adopt the PPF standard. But a recent survey by the American Association of Printing and Publishing Technology Suppliers showed that customers who buy new presses rarely consider whether the press has CIP3 technology. Most customers plan to completely replace all production equipment. Therefore, CIP3 technology equipment will take some time to have an impact. However, in the next 10 years, the automated printing process using the CIP3 standard will certainly be promoted and applied.
Looking to the future
From the current trend, sheetfed offset printing technology is moving in different directions, targeting printers with different production scales and product markets. One of the main development directions is to increase the degree of automation and shorten the preparation time for adjustment. The automatic press is easy to operate and requires less operational skills. In fact, the latest offset presses with direct imaging capabilities have minimized training requirements for press operations. Since employers continue to face the shortage of skilled printing workers, the press is still very promising from a human resources perspective. Color management techniques will increasingly be used in digital prepress operations. We will also see more and more printing companies making proofs based on the characteristics of the printing press, rather than rigidly letting the press meet the technical specifications of the proofs. There is no doubt that lithographic presses will be no match for digital presses in the short-run color market (especially variable printing) over the next five years. However, lithographic presses offer greater flexibility than digital presses in the use of various substrates, coating materials, and spot colors in the field.
In general, lithographic offset presses will continue to be the most economical graphic transfer equipment in the printing industry after we enter the 21st century.