Talking about the finishing technology of carton surface
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First, the application and requirements of carton packaging
With the increasing awareness of environmental protection, the global carton/carton packaging industry has developed rapidly and its production capacity has increased significantly. Because the folding carton has low processing cost, convenient storage and transportation, is suitable for various printing methods (lithographic/offset, gravure, embossing/flexo, screen printing), easy to shape processing (die-cutting, folding and sticking) Suitable for automatic packaging (automatic completion of opening - forming a sealing and other processes), easy to sell, display and recycling, is conducive to environmental protection and other characteristics, especially through surface finishing (glazing, laminating, hot stamping, After the embossing, it is beneficial to the promotion and promotion of products, and the added value of products. It is widely used in the packaging of tobacco, alcohol, medicine, food, beverages, daily necessities, and handicrafts. In Europe, carton packs for beverages and foods such as juices, milk, cooked foods, snacks, snacks, etc. are everywhere. In recent years, with the increase in the demand for packaging of CD, VCD and DVD products in the software industry and the music products industry, PAWI Packaging Company of Switzerland has launched the new DataPac carton packaging method. The product is lighter in weight and more attractive in appearance printing. CD, VCD, DVD carton surface can print all kinds of information required by customers without the need for additional plastic cards or plastic packaging film, the package weight is reduced by 50%, and the mailing cost of the product is also significantly reduced. According to relevant information from the China Tobacco Department, the proportion of domestic hard-packed cigarettes has reached 56%.
With the rapid development of modern industry and the continuous improvement of people's living standards, the demand for folding cartons will continue to increase, and the quality of cartons is also higher. To avoid the waste on the automatic folding folder-gluer, the folding carton can automatically complete the process of opening, molding, filling and sealing on the high-speed packaging machine, which not only requires the design of the carton structure to be reasonable, but also ensures that the film has sufficient mold. Cutting accuracy and folding paste box accuracy. The increase of short-run jobs, the improvement of processing quality and the reduction of production costs are also the market pressures and problems faced by carton packaging enterprises. This requires the application of new technologies in the production process of carton packaging, continuously improving the automation of equipment and reducing equipment. Adjustment time and auxiliary preparation time for the job. Only by constantly adapting to new changes in the market and meeting the requirements of different users can we improve the competitiveness of carton packaging enterprises.
Second, the carton surface finishing technology
Since the ink layer of the offset printing ink is relatively thin and the ink color saturation is insufficient, the overall gloss effect of the printed product is often poor, and the surface gloss of the printed product is improved by the coating or glazing process, thereby improving the brightness of the printed ink layer. At the same time, it provides an effective protection for the carton packaging, so that its color can be processed in the post-press and not in the storage and packaging. The plastic film used for the film is transparent, has high gloss, and is inexpensive. However, since the paper after lamination is difficult to be recycled, it is not degradable and easily causes white pollution, and long-term use may endanger the health of workers. Therefore, the conventional instant coating adhesive material will be replaced by a high quality environmentally friendly new adhesive.
Glazing
Polishing not only enhances the surface brightness, protects printed graphics, but also does not affect the recycling and reuse of paper, saving resources and protecting the environment. Therefore, it is widely used for surface finishing of carton packaging. Varnish coatings mainly include solvent varnish, waterborne varnish, UV varnish and the like. Due to the poor efficacy of solvent varnish and environmental protection, the application range is greatly limited.
Varnish coating
1 Water-based glazing oil uses water as solvent, is non-toxic and tasteless, eliminates harm to human body and environmental pollution, has fast drying speed, good transparency of film layer, stable performance, good smoothness of glazing surface and suitable post-press processing. It is characterized by wide width, good heat sealing performance and safe and reliable use. It is increasingly valued by food, medicine, and tobacco carton packaging and printing companies.
2UV glazing relies on ultraviolet light to cause a chemical reaction inside the uV coating to complete the curing process.