Direct offset printing technology for corrugated cardboard
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Technical characteristics of direct offset printing of corrugated cardboard
The main printing equipment for direct offset printing of corrugated cardboard In recent years, the development speed of packaging and printing is at the forefront of the printing industry in China. Production value in 2005 accounted for 32% of the entire printing industry. It increased by 12% from the previous year. In the packaging and printing industry, color packaging boxes account for a considerable proportion. With the development of the economy and the continuous improvement of consumption levels, people are increasingly demanding the packaging of goods. The color packaging box not only needs to protect the goods and facilitate transportation, but also requires the original appearance of the goods to be truly reflected in the goods. On the outer packaging, it plays the role of displaying the quality of the goods and promoting sales. Therefore, the color box is a new type of product promotion carrier that combines the protection of goods and the advertising function of goods. The development of printing technology is a key factor in the development of color packaging. This article will briefly talk about a printing method of color packaging box - direct offset printing technology of corrugated cardboard.
Market prospects of corrugated board direct offset printing technology
The printing process of corrugated cardboard has gone from simple monochrome text printing to monochrome mesh image printing until today's color mesh image printing. The corrugated box printing is high quality, multi-color, three-dimensional and good visual effect. The direction of development. At present, the printing of corrugated cardboard has the most market share in flexography and offset printing. In the processing technology, there are generally pre-printing, pre-printing and direct printing methods. The first thing to do is to print the paper first and then laminate it onto the corrugated board, then die-cut. The pre-printing method is to use a web flexographic printing machine or a web gravure printing machine for printing, and still collect the material in the form of a web after printing, and then use the printed color surface web as a carton paper. The upper corrugated board production line is made of corrugated cardboard and then die-cut. Direct printing is the direct printing of corrugated cardboard onto a printing press. Corrugated direct flexo printing is mainly used for printing medium and low-grade cartons due to limitations of equipment and related technologies, and the printing quality needs to be further improved. Direct offset printing of corrugated cardboard is a printing method that has developed rapidly in recent years. With the improvement of equipment and process, the direct offset printing technology of corrugated cardboard has become mature. Direct offset printing can well meet the development requirements of multi-color and high-quality printing of corrugated cardboard, and the cost is relatively low. With the development of offset printing of corrugated board technology, it will gradually replace flexographic printing in certain areas of corrugated box printing. Corrugated board direct offset printing has the following advantages over flexo and offset printing:
1. Relative to flexographic printing
1 High printing quality, can print very fine texts and complex mesh images, the number of screen lines can reach 200 lines / inch.
2 The cost is lower, the cost of offset printing plate making is low, and the high standardization of offset printing also helps to reduce printing costs. In addition, the investment in the flexographic printing equipment is less than that of the flexographic printing equipment, and the flexibility of the equipment is also high, which also reduces the production cost of the product from another aspect.
3 The relatively short printing aid time is more economical for short-running.
4 The printing performance of various special information can be obviously improved, and the surface finishing such as lamination, glazing, etc. can be performed, and the printing quality is relatively stable.
2. Processing method relative to the first offset printing paper
1 The corresponding reduction of the process: the processing cost and materials for the processing of the crucible are omitted. In addition, the reduction of the process causes the entire printing processing time to be relatively shortened, the waste between the efficiency processes is also reduced, and the labor force is correspondingly reduced.
2 The amount of paper added is relatively small.
At present, there are some limitations in direct offset printing of corrugated cardboard.
1 Can not achieve the same as the flexographic printing equipment, the production efficiency is relatively low.
2 At present, offset printing direct printing paperboard is mainly printed with micro corrugated cardboard. For thick cardboard with large weight, it cannot be directly printed on offset printing machine.
3 Offset printing is relatively limited, and the types of printable prints are relatively small.
However, with the updating of offset printing technology and equipment and the invention of corresponding new materials, the above limitations can be alleviated or even eliminated to some extent.
Through the above analysis, we can see that in color box printing, direct printing of offset printing will become the main printing method for micro corrugated boxes. For paperboard and cardboard with relatively simple shapes and patterns, large quantities are still based on flexographic printing. For the top-quality print quality color box, it is processed by offset printing and then smashing.
Technical characteristics of direct offset printing of corrugated cardboard
The structural characteristics of corrugated board determine its technical characteristics when it comes to direct offset printing. Corrugated board printing is carried out on uneven surfaces formed by corrugated waves and troughs. The printing pressure during printing must be higher than the printing pressure required for the surface leveling material. The printing pressure cannot destroy the grooves and backs of corrugated board. . For such high difficulty requirements, it is impossible to achieve simple operation control of the ordinary printing press, but the development of the corresponding technology solves the above problems. These related technologies mainly have the following points:
1 The new blanket uses a super-compressed sponge layer to ensure the corrugated board peaks and troughs. The printing pressure difference improves the printing effect when direct offset printing is performed.
2 The successful development of the new corrugated board also created conditions for direct offset printing of corrugated board. The change in the corrugated board structure increases the strength of the corrugated board and weakens the surface irregularities created by the corrugated board peaks and troughs.
3 The development of new inks has successfully improved the printing quality of direct offset printing of corrugated cardboard. A flexible blanket can reduce the pressure difference between the crest and trough of the corrugated board, but the pressure difference cannot be completely eliminated. This will also create a difference in printing pressure. This printing pressure difference causes the ridges and recesses to expand at different degrees. The overprinting of the ink thus creates a quality problem in corrugated printing - the production of the "washing board" effect of printing. The new inks further reduce print quality problems due to uneven surface of corrugated board. For example, the Well-Perfect-EV1010-w ink developed by the German GS Ink Factory is exclusively used for direct offset printing of corrugated paper.
4 The continuous development of printing presses provides the necessary conditions for direct offset printing of corrugated cardboard. Offset equipment suppliers are now aware of the development of offset printing in packaging and printing, and have developed different types of printing equipment for packaging printing.
Direct offset printing of corrugated board Due to the printing pressure, the strength of the paperboard will also be reduced to different extents. Under the premise of ensuring the printing quality in the printing process, the printing pressure should be minimized. Therefore, direct offset pressure control of corrugated board is one of the most important issues we should pay attention to. It has a direct impact on print quality and paperboard structure and is a key factor in the quality of the final product.
The color printing of corrugated boxes is an inevitable development trend. The characteristics of offset printing itself and excellent printing quality cater to the quality requirements of corrugated box printing development. Offset printing of corrugated cardboard has now occupied a certain market share. As the quality requirements of carton printing have increased, offset printing of corrugated cardboard has continued to grow. However, this does not mean that offset printing of corrugated paperboard will dominate the future market of corrugated box color printing. The rise and development of new crafts will coexist with traditional crafts for a long period of time, complement each other.