CTP plate making VS DI plate making
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In the 21st century, there are two main topics in the lithography industry: one is the filmless plate making CTP (computer-to-plate); the other is the DI that extends the CTP capability to the printing press to directly form the image print on the plate cylinder. That is, the plate making machine and the printing machine are integrated. It is predicted that there will be no CTP in 20 years and only the DI machine, that is, when the old generation of printing machines is gradually dying, CTP imaging technology is not expensive. Why do you want to make a plate on a flat press? The following reasons are supported:
1. Brightening conditions for plate making.
2. No need to change plates, reduce time and plate costs, and be more environmentally friendly:
3. The imaging unit is more affordable and does not burden the multi-group printing unit.
4, print distribution information, can automatically open the ink key opening technology.
5. Strong network acceptance.
6. Normalized print just file format.
7. It is best to have a variable inkjet or other technology connection to create additional features.
Currently CTP is produced off-line, a CTP platesetter is available for multiple presses, and traditional lithographic presses can work with CTP plates. In the DI era, the original printing machine was equipped with imaging plate making system and network file processing capabilities. The times are slowly changing. In the future, press operators must also have the ability to make plates. Otherwise, if the DI machine is operated by two groups of people, it will be too much trouble!
Rapid development of CTP and DI
CTP computer direct plate output and DI on-board platemaking are based on digital printing technology. At the same time, they all skip the negative film and directly make the printing on the printing plate. The difference is in CTP Foot Offline offline plate making. DI is the relative position of Online on the printing press. What is the difference between the two? CTP can use the DI plate making mode, that is, the plate making in the bright room without the darkroom equipment, the developing plate (a few DI needs) Development), etc., whereas CTP can also be imaged in a closed space using visible light, or it can be developed after development or even preheating.
CTP technology was published in 1990, DI technology was published in Chicago in 1991, and CTP grew rapidly in 2001. 65% of European printing plates use CTP, Agfa CTP - 85% annual growth, can be said to have explosive growth. In the same time, DI printing presses also launched many printing machine manufacturers such as Heidelberg, KBA, Ryobi, Screen, Sakurai, Adast, Manroland, Komori and Presstek, especially Heidelberg has QM46DI, which sold more than 1,600 units, SM- The 74D1 machine sold more than 600 printing units in three years, showing good results. KBA's 74Karat has different technology, and there are also 40 or 50 sales results. The screen is made of different technologies. There are more than 100 sets in Japan, and it is sold all over the world. At present, the number of DI is compared with the number of CTPs in the world. There is a gap, but the amount of equipment sales is similar. You may be curious. The foreign DI is so good that all of Taiwan is defeated by CTP printing! What is this all about? This is the focus of this article.
CTP summarizes pre-press digitalization work respects the original printing press
CTP must rely on two conditions, one is the digital workflow, and the other is digital color proofing. Only when these two conditions are fully mature can CTP's plate output be accepted, and then signed and printed to print, then DI printing Do you not want these two conditions? The answer is also necessary, then what is the difference?
CTP as small as A3 five boot, using polyester plate silver version, large 1600mm Big Mac VLF four Chrysanthemum CTP, can supply plates, DI must be fixed printing size, fixed machine using DI to make plates There is no way to make plates for others. After the CTP plate is output, the object is not very picky. Screen's full-page PR-8000 type can only be used for full sheet, chrysanthemum and chrysanthemum half CTP plates, but some customers say "our A3 small machine 520mm version, Also hope to use the CTP version, the screen will reduce the minimum size to A3!
The printing plate produced by a CTP device can supply two, three, and five printing presses. As long as the production capacity is available, there is no suitable external conditions, and you want to use the CTP version, or do not want to use the CTP version. Back to the PS version, all have the flexibility of use. In general, the CTP plate can not be baked except the silver salt plate. Most of them are the same as the original PS plate. All the printing machines can be printed without exception. That is, "summary of the digital pre-press work, step-by-step can output the printing plate, while respecting all the original printing presses, without changing or buying new printing presses."
DI emphasizes prepress and print set
DI printing machine is basically a combination of CTP plate making and printing. In other words, investors must buy a new DI printing machine from the printing machine manufacturer, in order to have a way to do on-board plate making work. DI machine in addition to the screen screen True
Press, Manroland DICO Web, Heidelberg SM74DI and Komori Komori ProjectD, all use non-horizontal printing technology, while SM-74DI and Project D is both a CTP machine and a foreign plate can be used, and the other must only use DI one way, that is, when RIP does not come out or DI out any problem, it is impossible to get external plate support.
The DI machines are all oriented on the way to simplify the operator. If you use the horizontal printing to avoid the ink balance, use the Anilox micro-cavity ink supply roller with no ink groove button. If you use water, use the sensing device to detect the water distribution. If there is an ink key, use CIP3 or 4 type to obtain the print distribution in digital form and automatically convert it into ink key opening information.
Most DI machines cost a lot of money to invest in a multi-plate printing unit. Another headache is that the DI plate is concentrated in a company's patented product. A3 is worth $10, which is more than CTP. The A version is four times as large as the four-dollar 8 dollars, and the long-term consumption can not reduce the cost. Therefore, Screen's true press uses a cheaper SDP, polyester plate silver salt version, but an imaging system also takes a long time, and it takes more time to develop on-board. Now more DI is using wet water or special ink development.
The DI machine emphasizes the network receiving ability. The machine does not require prepress equipment support, but the disadvantages must also be considered.
Manroland's DICo Web has different ideas
On the DI plate-making printing press, except for a few thin-volume printing plates, the DI plate using the aluminum substrate also needs to have the plate-changing action. It takes less than four or five minutes to replace the PS plate or CTP plate. Installed, anyway, the nail gauge system is also very accurate now! Why bother to spend four or five minutes on the printing machine to image plate?
So Manroland's DICO The Web can reuse the sleeve type plate. After imaging, baking and printing, the print can be wiped off with solvent. Just like the blanket cleaning method and time, the benefit is that there is no plate consumption. There is no delay in the exit of the plate and the loading of the new plate. In contrast, the efficiency of the DI press can be effectively improved. Under the high-speed rotary printing, one or two thousand working daisy can change three workpieces per hour and reduce the consumption. Aluminum plate, this kind of wet water and aluminum alloy sleeve plate can be reused between 200 and 500 times, creating different production and thinking directions, while connecting drying, cooling and origami, binding engineering, bring - Consistent production benefits, making the production capacity of commercial rotary machines a big step forward, in addition to the continuous reception of information to the completion of production, in the short printing capacity and any leaf or rotary machine can match, But the new technology investment is also great.
CTP will become a universal value DI may not
Some people also use inkjet imaging CTP, ordinary PSI version to use the Yin platform UV image sensing, do not have to use the special expensive CTP plate CTP plate making method, I believe that there will be more than 95% penetration rate of the CTP plate making technology, presenting a kind Universal value process.
DI is limited because of the large amount of investment (tens of millions of yuan, hundreds of millions of yuan), and the scope of work, the use of plates, etc., unless there is a specific work in this scope to operate smoothly, DI must be very universal The way of chemical production, there is no opportunity in the current technical range.
Taiwan CTP users are getting better
In Japan, the Ministry of Printing and Platemaking has made the CTP a development goal, but it is not very smooth, because once it is introduced, it is very difficult to solve the proof. When the digital proof is not accepted, it is forced to win. It has been used on the traditional proofing machine on the output CTP plate to proof, which is not only engineering, but also costly, in case the cost of modification is greater.
Some people also mix CTP and CIP3/4 twins, and think that there is no digital information flow of CIP without introducing CTP. This is not true. CPT information files can also be used as usual with CTF! Only CTP is “downwinding the wall”. .
In Taiwan, DDCP-self-connected digital proofing customers have a high degree of cooperation, and the gap between printed and printed products has certain expectations. Therefore, the gap is not large, and the engineering flexibility of Taiwan's printing industry is wider than that of Japan, and the external file RlP solution There are also fewer translation accidents. A large printing company introduced thermal CTP a year ago, with about four sets of 16 CTP plates per hour and 3,800 CTP plates per month, compared to 7,000 per month for traditional CTFs. The amount of printing. CTP can reduce about three employees. The cost of plate material is currently around 250 yuan, about 950,000 yuan. It is more expensive than the PS version in terms of consumables, but it costs about 350,000 yuan to save the film material fee, flushing and tube. The final processing of 50,000 yuan, personnel around 140,000, 3800 PS plate to more than 530,000, the cost is cheaper - most, the most important is no-automatic production, 24 hours as long as the film output manpower can be used CTP Make a plate.
In terms of plate quality, CTP is better than the PS version using the negative film. It is said that the thermal version has no problem at all, and it is not the case. Because the thermal CTP plate needs to be very careful in transportation and storage, otherwise it will be heated before use. It also has an impact on subsequent imprinting, which is currently noticed by material suppliers or users.
The 10 million yuan CTP output machine is 6 million yuan more expensive than the 4 million CTF. If you add 20 yuan depreciation calculation for each plate, it is enough to output 300,000 plates, then 80 Month (more than 6 years and a half), but to see the update faster CTP output machine appears, but also the early introduction of brains, to deal with faster depreciation, mainly to the quality and efficiency of CTP, more and more confidence.
China's CTP development and Taiwan's different tune
CTP computer direct plate-making has ended the complicated multi-level artificial plate-making process, not only requires all digital pre-press information, but also provides complete color management, digital proofing and electronic grouping, stacking, and even CIP3 /CIP4 digital message flow, Taiwan introduced CTP earlier than China two years ago, in 1996, Dexian company was introduced, and today she can not become "advanced" "ancestor" but became "martyr", Chengren exited the market, Mainly due to improper cooperation between software and hardware and the Internet.
Compared with the introduction of CTP by Taiwan's plate-making factory and its extensive use, the Chinese side introduced the first CTP in 1998 by the newspaper industry. At present, there are 22 statistics, and there are as many as 6 in the Yangcheng Evening News in Guangdong. Timely asking for shortening and quality improvement has played a big role, but there are also many decorations. There are 56 printing houses in the printing industry, 31 in Guangdong Province, accounting for more than half, and 4 in Shanghai, 7 in Beijing, accounting for nearly half of the other 25, and other provinces are more than one, most of which are for research and development.
In terms of commercial CTP, most of China is dominated by heat, Taiwan is geographically distributed, and Taipei and the suburbs have a lot of heat. Taichung City and other places are the distribution of visible silver. China's newspaper industry is dominated by Agfa visible silver, and there is not much comprehensive use of CTP. Taiwan is not expensive due to high price and high cost. However, 2003 may be the first year of CTP introduction, mainly shortening. Printing process and reducing manpower considerations.
[After the deadline, the joint report will introduce 20 CTPs into the tone. (This paragraph refers to China's printing of the 2003 direct plate-making machine throughout the country in February 2003.)
Overwhelming depreciation years algorithm
Japanese printing industry interviewed CTP kinds of printing plates and photosensitive laser light types. The president said that he wants to buy thermal CTP, and it also includes control software and software system, about 110 million yen, NT$30 million. It’s really expensive enough to listen to us. What about the next business plan?
In Taiwan, there is only one-third of the price, and 30,000 CTP plates are produced each year. When the depreciation is 3.3 years, each plate will cost about 100 yuan. The depreciation proposed by Japan is similar to ours, but the age is up to 9 years, which makes us do not know how to respond, because after nine years, we can't talk about it. In two years, people's machines may double and the material cost is only 70, 80%. Leading for three years, after six years of beating, it is impossible to turn over. Our short, fast and accurate practice is to protect the cattle in the era of modern rapid change. The Japanese should think about not buying so expensive and depreciating years. Long equipment!