Discussion on offset printing technology of the ho

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Discussion on offset printing technology of micro corrugated paperboard

I. characteristics of direct offset printing of micro corrugated paperboard

direct offset printing technology of micro corrugated paperboard is maturing with the successful development of new micro corrugated paperboard, special rubber blanket and ink. Offset printing is the most popular and technologically mature printing method in China, and the printing quality is also widely recognized. It is believed that this direct offset printing method will become a processing means with strong market appeal in China. But at present, this new technology is only applicable to fine corrugated board, especially G-type and F-type fine corrugated board

direct printing of micro corrugated board 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 box printing. The global demand for this technology shows that it is gradually more accepted in offset printing and flexo printing. Even in the future, the printing quality that flexographic printing cannot achieve can be achieved in offset printing, because relief printing has its limitations after all. The printing quality requirements of the packaging industry continue to grow. The performance of packaging design in excellent product transportation and external packaging further promotes the offset printing of micro corrugated board

pre printing can be processed by flexographic printing, gravure printing and other printing methods, which can ensure high printing quality and overprint accuracy, fast printing speed and high output. However, after printing, it needs to be rewound to form web prints, and then re corrugated on the micro corrugated board production line. Therefore, the cutting accuracy and requirements of the cutting device on the micro corrugated board production line are higher than those of the model: Wes ⑶ 00B, Moreover, this method is suitable for a large number of products in the same batch. If there are many product varieties and the batch of a single variety is not large, it is not ideal to use preprint

China's corrugated box industry has been very familiar with the two corrugated box processing methods of printing first, then mounting and flexo direct printing, and their applications have been very common, but they are relatively unfamiliar with preprint and offset direct printing. However, with the gradual improvement of the market and the gradual maturity of the process, direct offset printing with its own excellent quality of four-color printing, coupled with the manufacturer's research and development of modern offset printing technology in this field, micro corrugated board direct offset printing presents a good market prospect

offset printing can enter the field of direct color printing of micro corrugated board thanks to the following two aspects: first, the successful development of new micro corrugated board has made an important contribution to the realization of direct offset printing of micro corrugated board. Secondly, offset printing meets the needs of the development of micro corrugated board color printing, and micro corrugated board is also very suitable for direct printing by offset printing machine. Among them, G-type and F-type micro corrugated board have good stability and can also be printed on the spot. Especially now offset printing machines are equipped with flexo glazing units, which are no longer just used for printing. This is also more conducive to the development of micro corrugated board direct offset printing

Second, the advantages of micro corrugated paper extremely direct offset printing

with the development of offset direct printing micro corrugated board technology, it will replace flexo printing in some areas of corrugated box printing. Figure 1 is a comparison of the quality and cost distribution of micro corrugated board printed directly by offset printing with flexo printing and corrugated board printed first by offset printing and then by mounting. As can be seen from Figure 1, the printing quality of direct offset printing is better than flexo printing, and the cost is relatively low. In terms of quality and cost, direct offset printing is between flexo printing and pre offset printing in the process of mounting

compared with the traditional color flexo printing process, direct offset printing has obvious advantages

■ excellent printing quality, which can print very thin words and lines

■ low printing cost, low plate making cost of offset printing with conventional PS plate, and high standardization of offset printing helps to reduce production costs

■ various special promotional information can improve the printing performance

■ the installation and adjustment time is short, and 336 roof engineering version is more economical

compared with the processing method of cotton paper offset printing and then mounting with corrugated paper, the advantages of offset printing direct printing of micro corrugated board are as follows:

■ the mounting cost is saved, and the waste of materials is correspondingly reduced due to the reduction of processes

■ the dosage of paper is relatively small

■ because there is no need for another working process, the whole printing processing time is relatively shortened, and the efficiency is improved.

micro corrugated board directly enables this kind of materials to reach the optimal quality. The problems and solutions of offset printing

direct offset printing of micro corrugated board should first consider the uneven surface of micro corrugated board. Different from the printing of ordinary paperboard, the printing of micro corrugated paperboard must be carried out on the uneven surface caused by corrugated peaks and troughs. Offset printing is difficult to print uneven substrates, and the printing quality is also difficult to be guaranteed

the unevenness of the substrate is a major challenge for micro corrugated board printing. The printing machine must deal with the structure composed of grooves and ridges, which corresponds to the solid plate structure. Another difficulty is that in fact, ink transfer from blanket to corrugated paper requires a certain contact pressure, in order to achieve a clear image in the grooved part. This pressure is higher than the pressure for effective printing on the smooth paper on the ridge, and it will not weaken the structure and stability of the micro corrugated board. This condition is the starting point of direct offset printing of micro corrugated board. Many corrugated paper suppliers have provided the necessary material quality to adapt to uninterrupted printing

the blanket required for direct offset printing of micro corrugated board should have quite good elasticity. It enables the printing process to use the highest printing pressure without causing too much increase in back pressure. This avoids excessive compression of the grooves. So as to maintain the chromaticity of micro corrugated board and the stability of box type. Due to the optimization of blanket, the ink can be transferred well to achieve the highest quality of micro corrugated board printing (to be continued)

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