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The inner layer of corrugated board is a special wavy structure that buffers the vibration and enhances the impact ability. It is mainly used in the outer packaging of goods. With the appearance of waterproof corrugated cardboard and reinforced corrugated board, corrugated board can also be made into special liquid packaging containers, which expands the application of corrugated cardboard. With the continuous improvement of flexo printing technology, more and more flexo printing methods are used on corrugated paper. According to statistics, the color printing of corrugated boxes mainly uses flexographic printing technology. The United States accounts for 98%, Western Europe accounts for 85%, China's corrugated board printing area for packaging exceeds 10 billion m2 per year, facing such a huge market. In the face of such a huge market, we must further improve the printing process of corrugated paper, improve printing quality, and meet the needs of market development.
Advantages of flexo printing in corrugated cardboard When using flexo printing technology, due to the elastic deformation of the flexographic printing plate, the thickness and tolerance of the printing can be compensated for, and the unevenness of the surface can be compensated to make the printing ink uniform; the color printing of foreign corrugated cardboard tends to be white. E-type corrugated cardboard, high-grade printing network cable up to 120 lines / in, can print the field version, but also print cable version, and to achieve four color printing; flexographic printing belongs to light pressure printing, printing pressure is small, solved Due to the uneven thickness of the corrugated paper, the imprinting or imprinting of the imprints is not true. The flexo-printing uses water-based ink, so the metal anilox roller can be used to transfer the ink. The printing plate only touches the corrugated cardboard gently, and the water-based ink is completely Absorption; flexo press structure is simple, four rollers form a color group, loading, adjustment, cleaning is very convenient, flexographic printing press can also be linked with other processes, such as indentation, slotting, die-cutting, coating , box, count, etc. constitute a linkage production line.
Corrugated board color flexo printing process corrugated cardboard color printing flexo printing process: graphic design → image processing → plate making → printing → die-cutting → box-manuscript graphic design and image processing must take full account of the characteristics of corrugated paper to avoid full Printed in the same way as the corrugated pattern, the text should not be too small, the ink should be eye-catching, and the ink with strong coloring and saturation should be selected. The number of screens for color printing is generally 60 lines/in, and the high-grade print is 100-120 lines/in, the number of colors is 3-4 colors, there are also 5-6 colors, and at most only 2% of the dots can be printed. In the separation and separation of the film, comprehensive consideration of the actual ink parameters, dot gain and other parameters, the preparation of outstanding balance program, and draw the C, M, Y and BK tone reproduction curve. In addition, we must fully consider the different number of lines, the width of the flexo printer, and the printing slot machine, as well as the influence of different materials and pressures. In the plate making process, a thicker photosensitive resin plate is selected for the flexographic plate, which has a thickness of about 3-7 mm and a hardness of 25-50 Shore Hardness (HS). When the quality of corrugated paper is poor, thicker and lower hardness plates are used. When the quality of corrugated paper is better and small prints and screen printing are required, a plate with a higher hardness is used. When printing with a thick plate, the printing pressure is too small, the printing substrate easily produces corrugated and "sawboard"-like patterns, affecting the quality of the field and the number of screens with high print quality; when the printing pressure is too high, the printed substrate is easily deformed and damaged. Causes the deformation of resin plates and dot gain. At the same plate thickness and speed, the printing plate with higher hardness has no obvious enlargement of the imprinting, but the imprinting on the edge parallel to the corrugated fiber is less realistic, the soft plate with lower hardness has strong print, but the edge parallel to the corrugated fiber expands. .
The American R/bak air-cushion lining plate technology is a liner technology that is widely used at present, and it can effectively prevent the deformation of the printing plate and the destruction of the corrugated paper, make the ink layer more uniform, and have better printing tone levels and sharpness. When used, it is only necessary to place the liner containing the microbubbles on the back of the flexographic plate and apply it on the cylinder. During the printing, the air barrier has the function of buffering pressure and absorbs the printing substrate, the printing plate and the plate roller. The pressure generated. The dot enlargement caused by excessive or small printing pressure and the deformation and damage of corrugated paper can all be reduced or even eliminated. It also has a unique compensating effect on the oversized plate roll and has good adaptability to various corrugated papers. Sex. Therefore, the momentum type lining technology gradually replaced the traditional thick type printing plate.
The main feature of the flexographic printing press is that the ink path is short, and the anilox roller is the key component of ink transfer and ink distribution. The structure and line number of the ink hole on the anilox roller determine the ink transfer performance and application range of the anilox roller. In the corrugated board flexo printing, the number of anilox roller lines is often 180-300 lines/in, and the ratio of line number of screen dots to that of anilox rollers is 1:4-1:5. In addition, the majority of corrugated board flexographic printing presses have a drum arrangement in which an impression cylinder is on top and a printing plate cylinder is on the bottom, and the bottom surface of the cardboard is printed so that dust and shredded paper on the printing surface can be naturally dropped.
After the corrugated board is printed, according to the design requirements of various packaging boxes and boxes, the corresponding die-cutting methods and box making equipment are used for die-cutting, and finally the desired products are produced.
Corrugated board color printing
Over the years, the printing of corrugated board is merely applying functional marks on the packaging box of corrugated board, or it is a simple line, text monochrome printing, and its process is backward, inefficient and high in cost. With the development of the market economy, people's demands for packaging products have been continuously improved. Corrugated paperboard boxes and special-shaped corrugated paper boxes with various colors and designs have emerged, which have increased the added value of products and increased the competitiveness of products. Adapted to the development of the international packaging market.