The laminating process is a surface processing process after printing. It is also known as post-press lamination, post-press laminating or post-press lamination. It refers to using a laminating machine to cover a layer of 0.012 ～ 0.020mm on the surface of the printed product The thick transparent plastic film forms a paper-plastic integration product processing technology. Generally speaking, it can be divided into two types: instant coating film and pre-coating film according to the process used, and two kinds of bright film and matte film according to the different film materials. As a process for protecting and decorating the surface of printed products, lamination accounts for a large share of post-press processing. Just walk into a bookstore and you will find that most books use this method. This is because the surface of the printed product after coating will be smoother, brighter, stain-resistant, water-resistant, and wear-resistant. The color of the cover of the book is more vivid and dazzling, and it is not easy to be damaged. The wear resistance, folding resistance, tensile resistance and Moisture resistance has been greatly enhanced, protecting the appearance of various types of printed materials and increasing service life. The most worth mentioning is that the coating can make up for the quality defects of the printed products to a great extent. Many of the apparent defects that occur during the printing process can be covered after the coating (especially after the matt film is coated) . Therefore, the laminating process is widely used in various types of packaging and decoration prints, books, periodicals, calendars, maps, etc. in various binding forms in China, and is a very popular printing surface processing technology. Laminating technology entered China in the 1980s. Due to its many advantages, it became popular in the country in a very short period of time and gradually became the darling of surface decoration of books and periodicals. Nowadays, people's awareness of environmental protection is gradually increasing, and relevant laws and regulations are constantly improving. The two major problems of pollution generated during the processing of the film and the difficulty of recycling when the film products are discarded are in front of people. When you mention the film, people often think of it. "White pollution". Many people in the industry have doubts about the function of the film and whether it can continue to be used. The original State Economic and Trade Commission in 2002 issued the No. 32 order, which included the solvent-based instant coating film machine in the third batch of "eliminating backward production capacity" , Process and product catalog ". To be sure, in the future development process, the laminating technology will receive more and more tests. How will the coating develop? Is it completely eliminated or a reasonable development? These problems will become inevitable problems in the development of the coating process. Worrying situation When we visit the exhibition of books and periodicals, it is difficult to see the products covered with film on the booths abroad. In some developed countries, the laws and regulations on environmental protection, health, and fire insurance are relatively complete, making it difficult for the lamination process to develop. On the contrary, the film market in China presents a scene of "prosperity". If you want to talk about the decoration of books and periodicals, you must talk about the process of film coating. 1. The main problems of the laminating process Although the prohibition of solvent-based coating film technology has been introduced for many years, there are still many small film factories in China continue to use it. It is understood that this process mainly has the following problems. (1) Affect the health of the operator, there is a hidden fire hazard The solvent-based coating uses solvents containing benzene, which damages the health of the operator and causes great pollution to the workshop environment. At the same time, with the continuous increase of the concentration of the surrounding organic solvents, it is extremely easy to burst fire due to the static electricity generated by the thin film material. And for the surrounding environment, the laminating factory itself is a serious source of pollution, which is potentially dangerous. (2) Paper and film materials after lamination are difficult to recycle and waste resources It is understood that 80% of the sources of papermaking fibers in China now depend on the recovery of waste paper, including paper wool and paper edges. In printed matter, the amount of paper used for book covers is also huge. If a large amount of film is used (especially instant coating material), and the paper and the plastic film cannot be separated, then the waste paper and the edge of the paper covered , Paper wool will not be recycled and cannot be degraded, which will bring unpredictable economic losses, in fact, a waste of resources. 2. Lagging process is backward but there are still reasons for the market Since solvent-based coatings are so harmful, why is there still such a large market? The following reasons more or less determine the reason for its existence. First, the laminating machine using solvent-based adhesives has been used for many years, the development of the equipment has been very mature, and the laminating accuracy is guaranteed. These machines are generally not easy to damage, maintenance is not complicated, and a lot of production has been accumulated in long-term use And maintenance experience, many manufacturers are reluctant to eliminate such solvent-based laminators that are still useful. Second, the solvent-based coating process has been popularized for decades, the technology is mature, and the product quality is guaranteed. Many companies and technicians are reluctant to replace a skilled process technology with a technology that they are not familiar with. Third, in terms of cost, solvent-based laminators are still relatively cheap. For printing plants, cost savings is to win profits. Fourth, although the water-based coating process improves the environmental problems in the production process and avoids harm to the operator's body, it still has many defects compared with the solvent-based coating process, such as the product quality is difficult to satisfy. 3. Attitudes of printing houses and publishing houses affect the development of lamination Generally speaking, it is a matter of time before the solvent-based coating process is completely eliminated, and we have proved this trend through interviews. It is foreseeable that the solvent-based film has reached the moment of exiting the stage of history. However, can we totally deny the laminating technology based on this? The author believes that under the current circumstances, the idea of ​​completely eliminating the laminating technology is unrealistic. The following two aspects deserve everyone's attention. (1) The profits of printing factories are difficult to give up For most printing plants, laminating is a big profit point in post-press processing, especially now that the printing industry has entered the era of meager profits. For laminating processing, it is difficult for printing plants to give up. The operators of the front line of lamination are the first victims of harmful gases. We can be comforted that the current printing plants (even some small-scale printing plants) generally recognize the hazards of the lamination process and are Try to reduce the possible pollution to a minimum, such as using more environmentally friendly processes and materials, and improving the ventilation facilities of the plant. They welcome environmentally friendly products such as water-based coatings and pre-coating films. (2) Press coating has become a habit The reporter found in the interview that the laminating process is highly respected by the publishing house. When choosing the decoration method for the surface of books and magazines, American editors always prefer laminating. Even when applying local UV glazing, the laminating must be done before glazing. It can be said that the publishing house plays a decisive role in the question of whether to cover the film, because in accordance with the general book publishing process, the publishing house must first formulate a plan, and the printing house or bookbinding plant is only implementing the publishing house ’s wishes. Some science and education publishing houses need to cover almost all books. On the issue of environmental protection, it is clear that the publishing house side is not as active as the printing house side. While people's living standards have improved, the requirements for print quality and surface decoration effects of paper publications have also greatly improved. In order to pursue the sales of book products, publishing houses must make great fuss on the cover of books and periodicals. In addition, the film can increase the density and brightness of the color, improve the color contrast, and can be waterproof and will not stick. At the same time, the physical properties of the paper such as tension value, smoothness, aging resistance, tear resistance and puncture resistance are generally improved, reducing the deformation and damage caused by the moisture of the paper products, and improving the rigidity and forming stability of the book. Greatly improve the added value of printed matter. Moreover, the investment in film cost is much lower than the increase in the added value of the product and the promotion rate of the product. For publishing houses, since laminating has so many advantages, why not do it? Therefore, the publishing unit and the printing plant should strengthen communication, and the printing plant should introduce the advantages and disadvantages of the laminating process to the publishing unit. The publishing unit can take into account the advantages and disadvantages of various processes when formulating the decoration plan of books and periodicals. Design with a sense of responsibility. Impression of Henan At present, some provinces and cities in China have issued relevant regulations prohibiting filming on student textbooks. Henan Province is a typical example. When I first heard about it, the author was surprised. Generally speaking, students ’textbooks are most in need of coating, especially primary school children ’s textbooks. Children are lively and active, and the wear on the textbooks is also large. Therefore, the functional requirements for folding, abrasion resistance, and waterproofing of books are relatively more high. Moreover, at the recent National People's Congress meeting, many delegates proposed to realize the reuse of student textbooks. If this goal is to be achieved, it should be necessary to cover the textbooks. But why is it prohibited to cover students' textbooks? On the one hand, we have repeatedly emphasized that the coated printed matter is contrary to the ideas of environmental protection and sustainable development. Even if it solves the pollution problem in the production process, at present, under the technical level of China, recycling after discarding is still not possible achieve. On the other hand, lamination increases the cost of textbooks. This cost is not only the cost of laminating finished books, but also the cost of paper wool and paper powder discarded during processing. Since this part of the scrap cannot be recovered, the cost can only be It is completely added to the price of each book that has been coated, which is also a burden for book users. It is understood that the laminating plant under the Henan Press and Publication Bureau was revoked after the ban was issued. As textbooks account for the vast majority of laminating products, many larger printing plants in Henan Province (such as Henan No. 1 Xinhua Printing Plant and No. 2 Xinhua Printing Plant, etc.) have already cancelled the lamination process after printing. When it comes to products that need to be coated, they are taken to other small factories for coating. Many of these larger printing plants have already eliminated solvent-based coatings and water-based coatings, and used more advanced pre-coating coatings before canceling the coating process. After the ban was issued, they all gave up the film. According to relevant sources in a printing plant, the printed books and periodicals printed by the plant now account for 20% to 30% of all printed materials. You must know that this number should reach more than 70%. It can be seen that the government's compulsory measures have caused the film to lose a large market in some regions, but from a national perspective, we need to re-understand such a process that makes people "love and hate". In fact, as part of printing technology, laminating technology is also developing with the continuous progress of various materials, equipment and processes, just like the progress of solvent-based laminating to water-based laminating, that is, coating laminating technology to pre-preparation The progress of coating technology, the continuous progress of various film materials and various adhesive materials, etc., this trend is also irreversible, which is also the hope of innovation in coating technology. Seeking development Printing technology is constantly improving, printing materials are constantly updated, and the changing factors of post-press processing conditions have an increasing impact on the laminating film. The printing quality standards and market demand are constantly increasing. This requires the laminating industry to change according to objective conditions and The new quality and technical standards were restructured. At the same time, we should also find some other processes that can replace the film in a timely manner to reduce the pressure of the film on the environment. 1. Can glazing replace the coating In fact, in addition to the coating process, UV glazing can also play a certain role in protecting and decorating the surface of the printed matter. The two are very similar in many functions. Due to the relatively low cost of UV glazing, the development is relatively rapid, and the product is very attractive, so it also has a certain market share in some post-press processing fields. Some people who are optimistic about UV glazing technology even believe that this technology can replace the coating technology and develop independently. In fact, this is just a wish of people. According to some printing plants that have applied UV glazing technology, the most widely used UV glazing is local glazing. Local UV glazing can improve the grade of books, but in most cases, this local UV glazing process is also in After coating, and before this coating process must be solvent-based coating. In addition, UV glazing still has many shortcomings compared with coating. For example, the protective effect, folding endurance and wear resistance of UV glazing are not as good as lamination, and there will be limitations in many fields, such as packaging boxes. Ready-made equipment foundation and mature technology; in addition, some UV varnish will also evaporate odor during the coating process, which will affect the operator. Today's printing houses and publishing houses attach great importance to this process, and believe that in the printing of books and periodicals, UV glazing can replace the laminating process. However, in general, UV glazing still has limitations in many aspects, there are still many problems in the process, and it can not completely replace the coating process. 2. Pre-coating technology Pre-coated film refers to the process of pre-gluing and rewinding plastic film before compounding with paper prints. It is first applied by the pre-coating film processing plant according to the different format of the application of the glue on the film and rewinded for the choice of the manufacturer, and then compounded with the printed matter. The pre-coating film began to be used in 1989, and has been widely used in European and American countries. It entered Asia around 1996. While entering Asia, Europe and the United States have announced the ban on the use of ready-to-coated films and changed to pre-coated films. Due to the late use, all countries in Asia except Japan now use pre-coated films, other countries (such as China, South Korea, etc.) are in the state of using both pre-coated films and ready-to-coated films. China has only started using pre-coated films since 2000, and the market share of pre-coated films in China is still very small. Compared with ready-to-coat films, pre-coated films have many advantages. If the pollution is reduced, there is no damage to the human body; it will not affect the quality of the film due to different paper properties or ink colors; the operation of the pre-coated film laminating machine is simpler, and the graphic effect after processing is better; wrinkles are basically eliminated , Bubbles, shedding and other phenomena. The 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-coating film in China is 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, more than half of the respondents believe that pre-coated film products are relatively high in price, because pre-coated film products are printing consumables, and the price cost of printing companies when selecting consumables is a problem that cannot be ignored. . In addition, due to the lack of paper and film separation technology in China, the pre-coated film cannot be completely called an environmentally friendly process in China. In response to this situation, pre-coated film products should reduce costs through large-scale production, so that the market price is getting closer to the needs of printing plants. At the same time, the research and development or introduction of paper membrane separation technology should also attract the attention of relevant departments, in order to achieve an environmentally friendly membrane and rationally develop the membrane technology when the membrane technology cannot be abandoned. Desktop Gas Grill, Built-In Gas Grill,Propane Gas Grill,Gas Bbq,Built In Gas Grills JIANGMEN XINXIN METAL PRODUCTS CO., LTD. , https://www.bbqoutdoorgrill.com
After the paper publication is processed with film, the graphics can be protected, and the visual effect is better, especially the matte film gives a soft, high-end, and comfortable feeling.