The role and pollution of film in postpress processing
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Everyone knows that postpress processing is the beauty of printed products. There are many members of this craft family, such as glazing, coating, bump (arching), bronzing, hologram hot stamping, laminating and so on. Each processing technology has its own branches and members according to different requirements. This paper only analyzes the role of film coating in post-press processing and pollution problems:
First, the classification of the film
1 According to the process of film coating, there are three types: dry film, wet film, and oil film.
2 According to the type of film, it is divided into O P P, BOPP, PET, Niu film and light film, matt film and so on.
3 According to the nature of the film adhesive: water-based film, oil-based film and pre-coated film.
Second, the role of film
The film can protect the printed product from abrasion, make the printed pattern more bright and full, increase the strength of the printed product (such as puncture strength, tensile strength), and prolong the storage time of the printed product (such as photo-molding, no fading, no yellowing) , greatly increasing the age of preservation).
Third, the application of film
Laminating process With the continuous improvement of customers' requirements for printing and packaging products and people's understanding and recognition of laminating products, the laminating process is more and more widely used in various fields of life and production. If you pay attention to it, you will soon find a wide variety of film products, such as pictures, color pages, publications, cartons, cartons, photos, etc., to name a few.
In addition, products that are not easy to see are also a large category, such as fertilizer bags, seed bags, handbags and other large packaging items. Not only the use of the film to strengthen the strength of the paper, but also the use of the film moisture barrier, in one fell swoop, improve the performance of the entire package.
Fourth, the problem of film contamination
Like other things, there are defects in the film, which is the problem of pollution. Membrane fouling is divided into three stages: film coating process pollution, product contamination and post-disposal pollution.
1. Process pollution
At present, most of the laminating equipment used in China is domestically produced equipment. The semi-automatic products are mostly oil-based laminating, and there are many manual labors. The distance between the person and the film is close, but the price of the equipment is low, and it is more suitable for the current labor force. Area
Used by manufacturers. The oily laminating adhesive and its thinner contain a large amount of chemical diluents such as benzenes and alcohols, which have large odor, strong volatility and toxicity, and have caused health damage to many people in the industry. Reports are reported from time to time, and because of their chemical properties make them extremely flammable, encountering open flames or strong light flammable, is a great hidden danger caused by fire in factory production.
The combination of these two conditions, that is, semi-automatic mechanical plus close-range manual operation, causes the operator to suffer from dizziness, headache, redness and other discomforts. The physical strength is very good, and those who are allergic to it will feel poor breathing and fatigue, and the skin of the severe person will be gorgeous. Terminal neuritis causes muscle atrophy and even life-threatening. Therefore, the author appeals that enterprises should not only consider problems from the perspective of cost, but also take comprehensive measures from social benefits and personnel health to take necessary measures to avoid such pollution or mitigate such pollution. The managers of the factory understand that the film-coaters are generally unwilling to do or not to do long, even in the case of surplus labor, working girls, and wage earners who are not looking for a job.
Some factories also use the method of frequent substitution or round-shifting, and even use the method of recruiting workers to work in the factory for several months to solve the problem of toxic and harmful substances to the personnel, but this is not the fundamental solution to the problem. method.
2, product pollution
Benzene and alcohols are highly volatile substances. Most of the volatiles are volatilized during the filming process and shortly after the product is formed, but a small amount remains in the product, along with storage conditions and storage. The time is extended and slowly evaporates.
The high-speed and high-efficiency production of modern industrial products makes the residual materials quickly conveyed to consumers. The odor and toxicity of these residual substances pollute the environment of consumers and damage the health of consumers. Today, the whole world is paying attention to the green, pollution-free and non-polluting nature of products, and this situation has to be changed.
3. Waste pollution
It is well known that paper products can be recycled, and paper products after film processing are generally not directly recycled by paper manufacturers, and need to be manually separated and then processed. If discarded directly, it will cause a new type of white pollution. Due to the large number of waste paper recycling personnel in China, there is no or no serious problem of waste pollution of coated paper products, but the potential existence of such factors does not disappear by itself.
V. Development prospects of laminating equipment and materials
With the development of science and technology, new materials, new processes, and new equipment will continue to be added to the field of dead wood. With the environmental awareness, health awareness, and the renewal and development of the operator's concept, the new scientific and technological achievements will eliminate the old process products, making the film process a qualitative change, “non-toxic, harmless, green and environmentally friendly” become the film. The inevitable development trend of the process. For example: water-based coating glue, which uses water-soluble polymer polyester material and water as a solvent, which is basically an environmentally friendly product. At present, domestic water-based coated rubber has poor stability, but such as WDT-3300, WDT-2200, and WDT-1100 produced in Korea have solved these defects and can completely replace oil-based plastic film adhesive products.
In terms of machinery, the laminating machine manufacturers in Guangdong, Hebei and Zhejiang have successively introduced several semi-automatic desktop dry laminating machines.
Korea Yongxin has also introduced four fully automatic water-based dry laminating machines for FLCD-S1020, 1090, 1350 and 1450 to the Chinese market. The operation process is completely automated, which greatly reduces the contact time of human-machines, and the use of glue is non-toxic. Harmless, green and environmentally friendly, these new products have just been launched and are used by domestic leading and modern-conscious corporate circles, such as Haier Fengcai, HK and so on. It can be said that "the little lotus has a sharp point, and it has already stood on the head."