On the application and equipment function of sheet

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On the application and equipment function of sheet fed lithography (Part I)

sheet fed lithography is facing the replacement of commercial rotary machines in the long version market, the threat of version free digital printing in very short and short versions, and the flexible version is in the productive competition of packaging and online processing. However, CTP computer has the convenience and price advantage of direct plate making, automatic plate replacement, automatic cleaning, and a series of automatic numerical changes of CIP4. In addition, MIS information application analysis, tracking Management, diversified improvement of printing machinery, such as double-sided, diversified glazing, base color, special color to flexo and on-line production in gravure, ink-jet on-line printing, this point is the yield point, cold pressing to rolling die cutting and other processing, sheet fed lithography test, in the market surrounded by strong enemies, opens a feasible path. This paper tries to explain the possibility of market and equipment function development direction. 1、 Background

after the rise of color sheet fed lithography technology in 1960, it has developed the largest market percentage in 40 years. It has reached a high proportion of 80% in Taiwan. Since the late 1990s, under the pressure of commercial rotary machines and the use of flexographic printing for beverage packaging, it still retains 40-45% of the total printing market. However, with the change of media, toner free printing has eroded the 0-100 short edition market, electronic media Network communication can replace magazines, books and promotional materials in the market of sheet fed and rotary lithography. However, the development of sheet fed lithography after the 1990s is not only to improve the printing speed, but also to comprehensively benefit from digital information such as CIP3 and 4. With the rapid replacement of automatic printing plates, automatic cleaning and automatic size change thickness

under the adjustment of printing pressure, 1-1.5 sets of printing plates were replaced every hour before, but now 4-5 sets of printing plates are capable, and the quality is stable. Glazing, matting, special gold and silver ink and white background can also be done at one go. Today's diversified double-sided sheet fed lithography can make its own innovation in tissue culture and publicity, and in terms of diversified processing, it can advance to packaging thick paper printing. In response to diversified media, 3D light shed, RFID conductive ink, sheet fed lithography also try to achieve a development status, such as the use of sheet fed lithography in Europe to print touch key PET film. Giant size lithography machines are competing for the market from cardboard, corrugated boxes, large maps and outdoor posters. Small size lithography machines also use polyester CTP plates to do small amount of color printing. Today, not only single-sided four-color and double-sided eight color machines are also very popular, creating the market demand for this kind of small print. The on-board plate making Di lithography machine, developed between water and no water, will still move towards water in the future. Looking forward to the next two decades, sheet fed lithography will still be the production equipment in the main market of printing, because it is extremely mature, cheap and efficient. In terms of production, the original three major formats can't be regretted. Inkjet, toner printing and electronic printing ink are also gradually developing in cost and productivity, which has a threatening impact on small print volume work

second, the development of culture and publicity printing

the cultural publicity printing centered on tissue paper, generally 50g/m2 to 150g/m2 paper, of course, sometimes 280~300g/m2 coated cardboard is printed on the cover, and the cultural printing is less than 120g/m2, with a printing volume of more than 10000 copies. Now most of them go into commercial rotary lithography machines, so the printing volume of books, posters or covers with a little thickness is in the large and small, They are all printed by sheet fed lithography, and only in small batches of 50~120g/m2 cultural and promotional materials or large batches with high quality requirements, can they be printed by sheet fed machine, which will become more and more obvious. However, there are also a small number of inserts in these prints, and the promotional materials are printed on one side. Naturally, sheet fed lithography can also be more beneficial and competent. In the future, a considerable proportion of eight color printing pieces with four colors on both sides will go to the flat printing of sheet fed paper with more than eight colors, which can be printed on both sides, because in addition to drying origami can't (also has the possibility of UV curing), it has the advantages of double-sided sheet fed flat printing in terms of time and labor saving, production flexibility, black and white free trial printing, and start-up consumption. The Japanese sheet fed flat printing factory shows that it is calculated by printing unit, The percentage of double-sided machines leaving the factory accounts for more than 50%, and there is no horizontal plane as far as possible, which shows the market demand. For example, Mitsubishi Heavy Industries has a double-sided machine with p-type change bite printing in the d-3000 model, which can change the production of single and double sides, and a double-sided special machine that can print the back with the same bite in front of the TP model. In 2005, jgas05 launched the d-3000xp model, which adopts the superposition printing of one color, two color, three color, four color, etc. on both sides of the upper and lower seats, so as to save space, but in order to prevent the fan-shaped extension of the paper, there is a special remote-control bite correction device for adjustment, This is also a single manufacturer in the world, which has the most types of double-sided machines

the double-sided machine with five colors plus five colors, or even six colors plus six colors, also has a mystery. Although the fifth and sixth colors can be printed in special colors other than color, they can also be polished and dried to prevent the color image from dragging and polluting. In some manufacturers, mixed inks are used to turn over the front and back printing halfway, and UV curing is used to reduce dirt and accelerate the post-processing process. In Taiwan, the main machine of the time electronic universal testing machine for complex printing is composed of four guide columns, an upper beam, a middle beam and a workbench. Under the pressure of wear-resistant cost, the double-sided eight color machine has been used in production. It is believed that more such machines will be put into production in the future

the small multi-color lithography machine in A3 size is also moving towards the four-color and eight color dual way. The polyester silver salt CTP is used at a lower cost, and the aluminum CTP printing plate is used with Juquan and folio big brother to compete for a small print volume market on a smaller number of prints. This situation also compresses the market development of plate making printing machine and toner printer on di machine. Because of its low cost and high efficiency, especially the price of plastic plate has a great price advantage

sheet fed lithography has a very wide range of sources for paper types, such as art galleries, special papers, variety specifications or sizes. There is no web feeding time. A sheet fed lithography has great changes in size, about a quarter of the late size can also be printed. The source of web paper for rotary machines is very fixed, less than one tenth of the sheet fed paper, and the width and cutting perimeter are also limited, which is also the market of sheet fed lithography, In particular, there are favorable conditions in places where the supply of web paper is not popular, and the charm of printed matter is sometimes often the effect of the printed paper media. Very common changes in paper materials require that the rotary machine is often unable to respond

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