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1. Problems at the level of consciousness
Our government and people have not paid enough attention to environmental protection issues. In developed countries, as long as there is a hidden problem in environmental protection, a certain technology is strictly prohibited, and "one-vote veto" cannot be discussed. However, our country must consider many comprehensive issues such as economic benefits. If the environmental awareness of the Chinese people is not raised to the height of "one vote veto," "UV glazing instead of laminating technology" is an empty phrase.
2. Problems at the technical level
At present, UV glazing technology is not very mature, and some technical problems have yet to be resolved. This is the direct reason that restricts the promotion of UV glazing technology.
(1) Folding, abrasion resistance and cost The primary purpose of coating and glazing is to beautify and protect the cover of books and periodicals. However, the resistance to folding and abrasion of domestic UV varnish is not very satisfactory. It can be seen that the book often suffers from breaks in the spine at the corners and at the pressure lines after repeated readings; the cover of the book is easily worn out during shipment, resulting in scrapping.
Some foreign professional refractive oils can solve the above problems, but the cost is relatively high, even higher than the film.
Timeliness of the magazine is strong, and the sales cycle is short. Readers rarely save after reading. Therefore, the wear resistance of varnish is relatively low. The coating process can basically meet the requirements. At present, some magazines have begun to use glazing technology.
(2) Pressure resistance If handled improperly, the lacquer layer at the spine side pressure line is easily broken.
(3) Appearance properties After coating, the thickness of the cover did not increase much and it appeared to be relatively soft. If the same thickness of paper was used, the appearance of the coating was not as good as that of the coating.
3. UV coating advantages and development prospects
Although there are still some difficulties in the promotion of UV glazing technology in China's publishing industry, the laminating process will not retreat from its dominant position in a short period of time. However, it should be recognized that the promotion of UV glazing technology is a general trend and various constraints will be gradually overcome. .
First of all, with the approaching of the 2008 Olympic Games, the country will pay more attention to the issue of environmental protection, and the people’s awareness of environmental protection will also increase rapidly. The pace of replacing lacquer with glazing will inevitably accelerate. From a technical point of view, a polishing machine that is both environmentally friendly and of superior quality has been launched. Under the attraction of huge business opportunities, domestic varnish manufacturers have also accelerated the process of solving the problem of folding, abrasion resistance and cost, and then they have applied the glazing process. The deficiencies on the slight improvement, UV coating instead of film is no longer a distant thing.
In addition, the UV coating also has many advantages that the coating does not possess: 1 The coating oil used has a solid content of 100% and no solvent evaporation, which is safe and environmentally friendly. 2 Drying speed is fast, and it is not limited by the type of substrate. After the UV coating, the surface of the printed product is smooth and bright, and the hardness is high. 3 The high production efficiency can greatly reduce the production cost. The combined cost of 250gm2 coated paper and 200gm2 coated paper is almost equivalent. In this way, in the case of the same cost, use thick paper as the cover, it can completely make up for the lack of glazing in the appearance characteristics. 4 Some domestic representative enterprises are continuously researching new technologies to promote the improvement of the overall level of UV coating technology in China. This will become the most powerful guarantee for the promotion of UV coating technology.
Third, domestic coating equipment has been fully able to meet the very demanding UV coating requirements. The YT1A1-type folio sheet paper machine developed and produced by the Henry-Hill Company can reach a speed of up to 8000 hours and can be matched with a high-speed offset press. Both partial full UV coating, partial full water glazing, and sheetfed flexo printing are available. In addition, the machine also has a significant improvement in the processing results and support for the post-process. It adopts the principle of flexo printing for UV glazing. The number of ceramic anilox roller screens is more than 600 thread inches. It can precisely control the amount of gloss oil for fine glazing, and can overcome the coating of traditional oil coating on the roller coating machine. Too thick, printed products are easy to crack, can not be hot stamping and other problems.
Problems with UV Glazing instead of Lamination Process
In order to improve the wear resistance and aesthetics of the book cover, the film has been widely used in the publishing field. However, with the increasing awareness of environmental protection in the world, more and more countries have begun to prohibit the use of lamination technology. In China, it was once publicized that UV coating was used instead of film lamination. However, due to various reasons, UV glazing has not been popularized and the film coating process still dominates the material market. Recently, the author discussed this issue with some people in the industry, such as Mr. Zhao Pengfei, People's Posts and Telecommunications Press, and he believes that UV glazing instead of laminating technology currently has some problems at the level of awareness and technology.