Fine corrugated offset printing technology
1. Fine corrugated direct offset printing technology
The corrugated carton industry in China is already familiar with the two methods of corrugated carton processing: printing first, then mounting and flexo direct printing, and its application is also very common, but it is relatively unfamiliar with pre-printing and offset printing. However, with the gradual improvement of the market and the gradual maturity of the process, the direct offset printing with its excellent quality of four-color printing, coupled with the continuous research and development of modern offset printing technology by manufacturers in this field, fine corrugated cardboard direct offset printing shows good Market prospects.
The direct offset printing technology of fine corrugated cardboard has gradually matured with the development of new fine corrugated cardboard, special blankets and inks. Offset printing is the most widely used and most mature printing method in China, and the printing quality is widely recognized by everyone. I believe this direct printing method of offset printing will become a very powerful processing method in China. But at present, this new technology is only applicable to fine corrugated board, especially G-type and F-type corrugated board. Direct printing of fine corrugated cardboard has the advantages of high production efficiency, low material consumption, low production cost, large product specifications, wide application range, high carton strength, neat appearance, and environmental protection. It is the main process of corrugated cardboard printing. With the continuous growth of the packaging industry's requirements for printing quality, as the packaging design performs in excellent product transportation and external packaging, it will further promote the application of fine corrugated cardboard offset printing.
Pre-printing can use flexo and gravure printing and other printing processing methods. This method can ensure high printing quality and overprint accuracy. The printing speed is fast and the output is high. The cardboard production line is complex corrugated, so the cutting precision and requirements of the cutting device on the fine corrugated cardboard production line are high, and this method is suitable for large quantities of printed products in the same batch. When it is not large, the use of pre-printing is not ideal. Offset printing can enter the field of direct color printing of fine corrugated cardboard due to the following two aspects:
First, the successful development of a new type of fine corrugated cardboard has made an important contribution to the realization of direct offset printing of fine corrugated cardboard. Second, offset printing meets the needs of the development of color printing on fine corrugated cardboard. Fine fine corrugated cardboard is also very suitable for direct printing by offset presses. Among them, G and F fine corrugated cardboard have good stability and can also be printed on the spot. Especially now the offset press is also equipped with a flexographic coating unit, which is no longer just for printing. This also contributes to the development of direct offset printing technology for fine corrugated board.
1. The advantage of direct offset printing of fine corrugated cardboard. With the development of direct printing fine corrugated board technology, it will replace flexo printing in certain areas of corrugated box printing. Compared with the traditional color flexo printing process, direct offset printing has obvious advantages.
â‘ Excellent printing quality, can print very fine characters and lines.
â‘¡The printing cost is low, the conventional PS plate is used for offset printing, the plate making cost is low, and the high standardization of offset printing helps reduce the production cost.
â‘¢The installation time is short, and the short version is more economical. Compared with the face paper offset printing and corrugated paper processing, the advantages of offset printing directly on fine corrugated cardboard are:
â‘ The cost of mounting is eliminated, and the reduction of the process reduces the waste of materials accordingly.
â‘¡ The amount of paper added is relatively small.
â‘¢Because no additional work process is needed, the printing processing time is relatively shortened, and the efficiency is improved.
2. Problems and solutions of direct offset printing of fine corrugated cardboard.
â‘ Offset printing is difficult to print on uneven substrates, and it is difficult to guarantee the printing quality. The first consideration for direct offset printing of fine corrugated cardboard is the uneven surface of fine corrugated cardboard. Unlike ordinary cardboard printing, fine corrugated cardboard printing must be performed on uneven surfaces caused by corrugated peaks and troughs.
The unevenness of the substrate is a major challenge for fine corrugated cardboard printing. The printing machine must deal with the problem that the structure composed of the groove and the spine corresponds to the structure of the three-dimensional plate. Another difficulty lies in the control of a certain contact pressure necessary for the transfer of ink from blanket to corrugated paper. In order to achieve a clear image even in the grooved part, this pressure should be higher than the pressure for effective printing on the smooth surface paper of the ridge, while it will not weaken the structure and stability of the fine corrugated cardboard. This condition is the starting point for direct offset printing of fine corrugated cardboard. Many corrugated paper suppliers have provided the necessary material quality to accommodate uninterrupted printing.
â‘¡The direct offset printing of fine corrugated cardboard puts forward higher requirements on the elasticity of the blanket. The good elasticity of the blanket allows the printing process to use the highest printing pressure without causing too much back pressure increase. This avoids excessive compression of the groove. So as to maintain the stability of fine corrugated cardboard color and box shape. Due to the optimization of the blanket, the ink can be transferred well to the highest quality of fine corrugated board printing.
â‘¢ The washboard effect is easy to occur. One of the most important conditions for direct offset printing of fine corrugated cardboard is to optimize the ink, so as to minimize the effect of the washboard. Fine corrugated cardboard printing, through the high compressibility of the rubber cloth to compensate for the change in printing pressure between the fine corrugated cardboard back and groove. However, the remaining pressure difference can still cause the dots of the ridges and recesses to expand and ink overprint to varying degrees. This needs to be compensated by ink when printing on fine corrugated board. Printing tests showed that optimizing the ink significantly reduced the washboard effect. It completes printing in a wider color gamut and proves to be the most suitable for printing on fine corrugated cardboard.
â‘£The carton strength will definitely decrease. Direct printing on fine corrugated cardboard, due to the effect of printing pressure, the strength of the carton will definitely decline, which is a major disadvantage of direct printing of fine corrugated cardboard. The effect of printing on the strength of fine corrugated cardboard is mainly reflected in the area and position of printing. Generally speaking, with the increase of the printing area, the strength of the cardboard decreases proportionally, and the full printing decreases by about 40%; horizontal strip printing, the width of the center 50mm is about 35%, and the width of the bottom 50mm is about 30%. The 50mm width of the upper and lower sides is about 37% lower, and the longitudinal printing of 50mm on the side and center of the end of the carton is about 5% lower. The successful application of the technology of direct printing fine corrugated board by offset presses has brought corrugated box packaging printing into a new development stage. Due to the high quality and low cost of fine corrugated cardboard direct offset printing, the printing and packaging industry can no longer ignore this technology. [next]
2. Fine corrugated indirect printing
That is, the carton facial paper is printed first, and then the printed facial paper is mounted on the corrugated paper. The conventional PS board is used for offset printing. Because the resolution of the PS plate is relatively high, very fine printing patterns can be printed. At present, most of the high-end corrugated boxes used for sales and packaging in China are printed by offset printing. Offset printing is a pre-printing method in the production process of corrugated boxes, that is, first printed on the facing paper, and then mounted on fine corrugated cardboard. It is not much different from the general offset printing process, so it will not be introduced here. Do a simple analysis of its main features. Corrugated cardboard boxes with offset printing have the following characteristics:
1. The plate making is easy, and it is the regular plate making of PS version.
2. Surface finishing, such as coating, glazing, etc.
3. High printing cost.
4. Not suitable for the use of cardboard linkage production line, only suitable for single-sided corrugated machine, the production efficiency is low.
5. The format is limited, generally smaller than that of flexo cartons.
6. The printed products are very fine, and the number of screen lines can reach 150 lines / inch to 200 lines / inch. The printing quality is relatively stable.
7. Due to more post-processes, the strength of the cardboard is reduced.
8. The ink generally contains benzene, which is contaminated.
With the continuous development of printing technology and process, the printing of fine corrugated cardboard will also be further developed. There will also be more competition among several printing methods of fine corrugated board, and this competition also promotes the continuous development of fine corrugated board printing.
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