Re-understanding of lamination technology (below)

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The continuous improvement of printing technology, the continuous updating of printing materials, the ever-changing factors of post-press processing conditions, and the increasing impact on the laminating film, the ever-increasing printing quality standards and market demands. This requires the laminating industry to change according to objective conditions. New quality and technical standards for structural adjustment. At the same time, we should also look for other processes that can replace the film in a timely manner to reduce the pressure of the film on the environment.

1. Varnish can replace the film

In fact, in addition to the laminating process, UV coating can also play a role in protecting and decorating the surface of the printed material. In many functions, the two are very similar. As the cost of UV coating is relatively low, the development is relatively rapid, and the product is very attractive, so it also occupies a certain market share in some areas of post-press processing. Some people who are optimistic about UV glazing technology even believe that this technology can be independently developed instead of film coating technology.
In fact, this is just a wish of people. According to some printers applying the UV coating technology, UV glazing is mostly applied locally. Local UV polishing can improve the quality of books, but in most cases, this local UV coating process is also After the film is applied, and the previous coating process must be a solvent-based film.

In addition, UV coating still has many deficiencies compared to film coating. For example, the protection of UV coating, the degree of folding, and the abrasion resistance are all inferior to those of laminating films. There are limitations in many fields, such as packaging boxes; UV glazing also needs to be put into printing equipment and UV curing equipment. Off-the-shelf equipment foundation and mature process; In addition, some UV varnish oils will volatilize odors during the coating process, affecting operators.

Today's printers and publishers are paying attention to this process, and believe that in the printing of books and publications, UV coating can replace the coating process. However, in general, UV glazing is still limited in many aspects. There are still many problems in the process, and it is still not completely replaced by the film coating process.

2. Precoat technology

Pre-coated film refers to a process in which plastic film is pre-wound and re-wound with paper. It is first used by the pre-coating film processing plant according to the use of different specifications of the format of the glue coating on the film after rewinding for the use of manufacturers to choose, and then with the print composite.

The precoating film began its use in about 1989 and has been widely used in European and American countries. It entered Asia in about 1996. At the same time that it entered Asia, Europe and the United States have announced that they will ban the use of ready-to-use membranes instead of pre-coating. Due to its late use, Asia now uses pre-coated films in all but Japan, and other countries (such as China, South Korea, etc.) are in the state of both pre-coated and ready-to-use films. China began to use pre-coating films since 2000, and the market share of pre-coated films in China is still very small.

Precoat has many advantages over instant coatings. If the pollution is reduced, no damage will be caused to the human body; the quality of the coating film will not be affected by the nature of the paper or the difference in the ink color; the operation of the precoating film laminator is simpler, and the graphic and textual effects after processing are better; the wrinkles are basically eliminated. , bubbles, shedding, etc. What is most worth mentioning is that this is an environmentally friendly process and the entire production process is harmless to the human body.

However, the promotion of pre-coated films in our country is still relatively slow. Among them, the cost issue is a big influencing factor, which determines the enthusiasm of investors for the pre-coating process. In a recent survey, it was shown that more than half of the respondents believe that pre-coated products are high in price, because pre-coated products are printing consumables, and the cost of printing products is a non-negligible issue when selecting consumables. . In addition, due to the lack of paper and film separation technology in China, the pre-coating film cannot be completely called an environmentally-friendly process in China.

In response to this situation, pre-coated products should reduce costs through large-scale production, so that the market price is getting closer to the needs of the printing plant. At the same time, the research and development or introduction of paper membrane separation technology should also attract the attention of relevant departments, so as to achieve environmental protection coating and rational development of the coating process without being able to abandon the coating process.

Source: Ke Yin Media - "Printing Technology"

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