Waterless printing - green printing tool
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The trend is green, printing is environmentally friendly, and the theme of PRINT CHINA 2011 is “Green, Efficient, Digital”. The Hong Kong Graphic Arts Society is closely following the trend, and together with Daxing Ink Chemicals (Hong Kong) Co., Ltd., Toray Industries, Japan and Japan In and Out Ink Manufacturing Co., Ltd., held a joint exhibition on how to do waterless printing at the exhibition on April 11th. Will, for the industry to analyze the benefits of waterless printing. The meeting was introduced by CGS Greater China Chen Xiaoxian, general manager of color management system, and Dong Li (China) Investment Co., Ltd. Ye Jianjiang introduced the principle of waterless printing, equipment, advantages and precautions. Finally, Mr. Chen Qiang, Director of Leo Paper Group (Hong Kong) Co., Ltd. shared the experience of waterless printing. A total of about 400 people attended the seminar.
The traditional flat letter offset printing is the principle of ink repelling, and the balance of ink is difficult, causing many printing defects. No horizontal intaglio uses silicone oil to replace water and ink, eliminating water interference. The printer only needs to pay attention to temperature and pressure, registration and gray balance, and can control the color better. Chen Hsiao-hsien cites four types of color standards:
1. PSO (Process Standard Offset): A printing standard based on ISO12647-2.
2. Fogra39 (based on PSO/ISO): Based on ISO12647-2, paper type 1 or 2 (gloss or mattcoated offset, 115 g/m2).
3. ISO 12647-7: The world standard for digital drafting.
4. ISO 12647-7 [8] for digital printing standards other than inkjet. The water-free offset printing products are full of inks, vivid colors and bright colors, and there is no influence of dampening solution. The expansion of the dot is small, and the halftone dot is expanded to about 7-8%. Waterless offset printing is easier to achieve the same consistency of various printing methods, greatly improving the printing quality.
Mr. Toray Ye Jianjiang gave a speech entitled "Waterless Printing, Caring for the Earth, Giving the Enterprise a New Life". He introduced the company's history and the development of waterless plates. Point out three major features of waterless printing:
1. does not use water (IPA, dampening solution), reduce VOC, easy to operate, shorten start-up, improve efficiency, reduce waste, stable color, and favorable standards.
2. flat concave version, easy to control dot spread, high-precision printing, FM network printing is easy to achieve.
3. water development, heat-sensitive (830mm) CTP, no need for preheating, positive exposure, no sewage. The printing production VOC comes from dampening solution, ink, car wash water, etc. The Tokyo Environment Bureau has tested the printing shop and detected that waterless printing can reduce 60-80% of VOC emissions from water printing.
Ye Manager cited five advantages in waterless printing:
1. The phenomenon that the paper is deformed due to the absorption of moisture does not occur, and the registration accuracy is excellent, especially for the double-sided machine, and the registration accuracy of the waterless printing has an absolute advantage.
2. the printing density change is small, the dot reproduction on the printed sheet is stable, and it is easy to realize CMS and difficult printing (FM, high definition, wide color gamut).
3. The yellowing caused by the long storage time of the paper can be controlled to a certain extent, and the printing effect of the long-term storage paper (neutral paper) can be obtained.
4. Printing on a non-absorbent substrate (such as aluminized paper, gold-plated paper, synthetic paper) is more stable.
He also exemplified prints that highlight the quality characteristics of waterless printing: cars, stereos, cameras, etc. (improving the expressiveness of fine parts); FM dots, high-line printing (small dot spread, realistic performance); Landscape painting, advertising (hierarchical. Strong sense of three-dimensional); maps, encyclopedia books (overprinting accuracy); dictionary (for printing ultra-thin paper).
He also exemplified the superiority of waterless printing in management, achieving printing standardization and data management:
1. good and thorough management of each press.
2. the instability of water can be eliminated during printing, so it is possible to thoroughly manage the printing density and the dots.
3. CTP versions of reproducibility, high quality registration accuracy. Finally, he cites the necessary conditions for waterless printing:
1. waterless version and a special plate processor.
2. waterless inks.
3. press is equipped with a cooling machine, and the ink roller is circulated and water cooled.
Leaf manager's professional materials make the audience's vision wide open. Finally, the director of the Leo Group, Chen Qiang, took the stage to share the practical experience of waterless printing. Leo began using waterless printing in 2005, and currently four printers use waterless printing for a long time. Because the plant printing press itself is equipped with a cooling device, there is no need to invest in machine modification costs. At present, there are two types of waterless printing. The first one, the Genius 52UV printing machine uses an anilox roller ink supply system, and has no ink key. At present, some of the big machines also have no ink keys. Secondly, the offset printing machine has inkless waterless printing. The printing machine does not need to be modified by the water cooling device, and the waterless printing can be performed only by removing the water sputum portion. If there is no water cooling, it must be modified. The price is different for each company. Chen Dong believes that the use of waterless printing, the first can promote environmental protection, because the waterless printing uses Non-Voc ink, can completely reduce the VOC displacement; the second can shorten the overprint to adjust the color time, production printing stability, reduce Adjust paper loss. Chen Dong hopes to implement waterless printing together with printing companies with the same concept, making the printing industry more environmentally friendly. For the cost of the audience's concern, Chen Dong specializes in email form back to copy art readers:
Daxing Wu Shengyang, general manager said: Daxing is actively introducing Japanese waterless ink technology to reduce costs, and hopes that more printing companies will use waterless printing to contribute to the national policy of green printing.
In order to promote the construction of China's ecological civilization, resource-saving and environment-friendly society, accelerate the implementation of the green printing strategy, promote the transformation of China's printing industry development mode, and achieve the goal of "printing power", the General Administration of Press and Publication has officially signed with the Ministry of Environmental Protection in Beijing. Implementation of the Green Printing Strategic Cooperation Agreement, the two departments jointly set up a green printing strategy work leading group. It marks that green printing will become the main direction of the future development of China's printing industry. The third generation of waterless printing technology, as a tool to promote the green printing strategy, has been adopted by more and more printing companies. Outside the Leo Group, there is also a one-third waterless printing of Jinbei Printing, and China Business has also been experimenting for many years. The author believes that as with the development history of CTP, waterless printing will one day become the protagonist of offset printing.