Innovative Application of Paper Packaging Printing Technology (1)

1. Paper Packaging Development Trends and Requirements for Technology

In recent years, the global paper product packaging industry has developed rapidly, and the production capacity of cartons and cartons has increased significantly. In the world packaging industry, paper packaging products exceed 32%. In Europe, the proportion of paper and paperboard consumption is as high as 41%. Per capita consumption of paper and board in 2000 was 331.7 kg in the United States, 249.9 kg in Japan, 229.4 kg in Taiwan, and 28.4 kg in mainland China. In 2000, China imported 13.03 million tons of paper, paperboard and pulp (about US$6 billion), accounting for 66.7% of China’s paper and paperboard consumption. In recent years, Hong Kong's packaging industry has grown at about twice the rate of the printing industry. In 2000, Guangdong's packaging industry achieved sales of 50 billion yuan, including 18 billion yuan in paper packaging products and 14 billion yuan in packaging and printing.

With the further enhancement of people's environmental awareness, cartons, cartons, paper bags, paper cups, paper tubes and other packaging containers are used more and more widely in Europe for a variety of fruit juices, milk, cooked food, snacks, snacks and other beverages. Food carton packs are everywhere. According to relevant information of the Chinese tobacco department, the proportion of domestic hard-packed cigarettes has reached 56%.

With the continuous improvement of people's living standards and the degree of automation of commodity packaging, not only the demand for cartons/cartons has increased significantly, but also higher requirements have been placed on the printing quality and processing accuracy of color folding cartons/multicolor cartons. . To avoid rabbits in the automatic folder gluer out of waste, so that the folding cartons in the high-speed packaging machine automatically open, molding, filling, sealing and other processes, not only requires that the carton structure is reasonable in size design but also should ensure that the cartridge has enough mold Cutting accuracy and folding folder accuracy. Multi-color printing, short-lived jobs, increased printing quality and processing precision, and reduced processing costs are also the market pressures and challenges faced by carton packaging and printing companies. Therefore, only with the application of modern processing methods and new technologies, the degree of automation of the equipment, the adjustment time of the equipment, and the auxiliary preparation time of the work are continuously improved in the process of paper packaging printing and post-press processing, and constantly adapting to new changes in the market and satisfying different requirements The requirements of users can improve the competitiveness of packaging and printing companies.

2 paper packaging container CAD technology

The popular carton structure CAD software on the international market, in addition to the basic functions of commonly used interactive graphics software (high-quality, rapid completion of graphics generation, editing, modification, dimensioning, etc.), should also meet the carton design The special requirements, easy to call the cassette graphics library and select the box-shaped structure, enter the box size (length, width, height) and cardboard thickness, you can immediately display or print the cassette structure, automatic discharge, and Output cartridge sheet die cutting discharge pattern, printing outline drawing and backing (bottom mold) processing drawing; when the user design or call for the required cassette sheet structure, as long as the input paper board size and discharge gap, can be expected And compare the different discharge plans, show the optimization of die-cutting discharge diagrams and related parameters (such as the number of discharges, board utilization, etc.).

In addition to selecting the standard box type and changing the shape of the carton, you can also freely design the special box type, rotary carton stereo diagram, and the opening and closing process of the display carton; for different cutting edges, indentation lines and slotted parts should be selected Corresponding line types are used to control the manufacture of carton samples, die-cut plates, bottom molds (backing plates), and die-cutting tools to improve the accuracy of die-cut plates and backing plates, and the accuracy of carton production.

3 paper packaging printing technology

In the field of paper packaging printing, lithographic offset printing, letterpress flexo printing, gravure printing, and screen printing coexist in a variety of formats, each with its own characteristics. In the single-sheet printing, offset printing is mostly used, flat screen printing and sheet-fed gravure printing are used. In web printing, gravure and flexo printing methods are mostly adopted, and offset printing and silk are also used. In the case of web printing, there are also several combinations of printing at the same time on a printing production line. Cartons are generally between 2-8 colors, of which 4-6 colors are used most. Folding cartons, especially kits, use more spot colors, so the number of printing kits is usually 6-8 colors. The number of color groups of a sheet-fed offset press is generally 4 colors, and basically no more than 5 to 6 colors. However, the use of multicolor web printing presses (including gravure printing, flexo printing, and screen printing) has rapidly increased. The number of printing color groups has reached 8 to 10 colors.

3.1 Offset Printing Technology

(1) Digital Printing and CTP Technology

Digital printing technology is printed on the basis of personalized database information, providing paper, paper boxes and corrugated boxes with the option of individualized packaging and printing. It can change the design and processing parameters of paper packaging containers by region or product difference. Using special techniques, the folding tray can have a changeable printing color and hot stamping effect, so as to meet the needs of large-sized and short-lived jobs in the market for packaging cartons (boxes).

Agfa developed high-definition CTP technology to provide high quality outlets for modern packaging printing. The use of unique laser and optical imaging systems, intelligent multi-beam simultaneous imaging methods, IntelliSpot intelligent network points and other technologies have increased the security of the system, simplified the system structure, and improved the degree of automation and overall efficiency of the system.

(to be continued)