Introduction to carton surface treatment technology
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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 demand for CD, VCD, and DVD product packaging in the software and music products industries, PAWI Packaging Company of Switzerland has introduced Data Pac's new 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, non-toxic and tasteless, eliminating harm to human body and environmental pollution. It has fast drying speed, good transparency of film layer, stable performance, good glazing surface smoothness 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. Due to the action of ultraviolet rays, UV glazing is instantaneously dried, and there is no evaporation of the solvent during curing, which does not cause environmental pollution. Printing with UV coating, high surface gloss, heat, abrasion, water and light resistance. However, due to the high price of UV coatings and high performance requirements, it is currently only used for glazing of high-grade cartons.
Glazing method
1 Stand-alone glazing: Use a dedicated glazing machine or calender to complete the carton glazing process.
2 Online glazing: printing and glazing are completed at one time. It has the characteristics of high speed and high efficiency, which reduces the trouble caused by the loss of printed products caused by the turnover of semi-finished products. The glazing can be carried out by means of a wetting device or an inking unit of the printing unit, or it can be glazed by a separate glazing unit on the printing press. Utilizing the glazing unit of the glazing unit, the efficiency is high and the glazing quality is stable. The glazing unit is monitored and controlled by the printing machine control center, such as lateral and circumferential registration adjustment of the photosensitive resin plate, and diagonal register adjustment. The inline glazing unit can evenly illuminate the entire surface of the carton or part of the text. The glazing can be carried out with a blanket or a partial glazing with a flexographic plate; both aqueous glazing and UV glazing can be carried out. The online glazing device can be divided into two types: a roller glazing device and a glazing device.