Printing roller selection, use, commissioning, maintenance overview

The choice of printing rollers: With the rapid development of the market economy, new equipment, new processes, new materials, especially new printing equipment are also produced. Renewal is also more timely, and domestic printing equipment also tends to have high technological content, durability, and advancement. From the point of view of the international printing industry, there are data showing that some developed countries in Europe and America are still ahead of us in printing equipment. Although the domestic printing industry entered the 1990s with the introduction of printing machinery and printing equipment from many developed countries, when the printing rollers were used for a certain number of years and needed to be replaced, the domestic printing rollers were far less than those of original equipment.

In the past, printing companies were all equipped with "plastic rooms," which were specialized in the production of printing rollers and were heavily polluted. With the development of the printing industry and the replacement of equipment, traditional old-fashioned printing rollers have gradually been eliminated due to their inability to adapt to the needs of high-speed printing machines. Its disadvantage is that it can not adapt to the high temperature and high humidity environment, it becomes soft at high temperature, it becomes hard at low temperature, and it is even more unsuitable for printing gold and printed textured versions, which hinders the improvement of printing quality.

Into the 80's printed rubber roller has a major revolution, the new roller from the climatic conditions and strong, good corrosion resistance, but the high cost, so that small and medium enterprises prohibitive. With the rapid economic development, it is still well received by the majority of users.

Debugging and correct use of the printing roller: No matter what kind of printing machine type or model is installed in the new equipment, the technical staff and the leader must first install the printing roller. The installation level of the rubber roller must be properly adjusted. It must be in close contact with the ink roller and the printing plate. Both are indispensable. Printing practitioners know that the height of the letterpress is 3.14mm, which is the same as the height of the lead type, while the PS version is relatively low at 1.2mm, so be sure to have a good idea when installing and debugging the rubber roller. If it is a printed product with a background color, the rubber roller can be adjusted to a lower level with an error of ±0.5 mm. This allows the ink roller to transfer the ink to the printing roller more evenly, and the printing roller is also reflected on the printing plate. The effect of the printed product is pleasing to the eye. If this is not the case, there will be phenomena such as ink bars and ink channels.

When printing text, the height of the rubber roller is basically the same as the text version or slightly lower, so that the printing roller can gently rub the printing plate, so that the character printing is very clear and neat, and the rubber roller wear surface is small. It is not easily damaged and can extend the life of the printing plate. Adjustment rollers should be used when adjusting. Before using, take out the printing plate and let the adjusting roller extend horizontally and pull it out several times. The size of the ink dot on the adjusting roller will be displayed immediately. The operator can determine the height of the printing roller according to the different needs of the printing, and then Put the top wire firmly. In this way, the height of the rubber roller does not change during high-speed printing. If we are impatient with the use of rubber rollers and we are anxious to make plans and save time, the following situations will occur: (A) The surface of the rubber roller is damaged, dregs are dropped, the characters are printed and printed, and the characters are blurred, and even appear. Paste, glue jumping phenomenon. (B) The text is inconsistent, and there are even prints on the surface that are only printed but not ink. (C) If the rubber roller is too tightly adjusted to the ink-transmitting rubber roller, the printing roller will be damaged to cause economic loss and equipment accidents.

Printing roller maintenance: In the offset printing technology, the key is the control of the balance between the waterway and the ink path, while the ink and ink balance is based on the key components of the rubber roller and the ink roller. The quality of the ink roller directly affects the product quality. This is especially true for gravure, emboss, and flexo. General printing companies maintain equipment once a week, including the maintenance of printing rollers. The following methods are available for maintenance:

1. After the production work is completed, clean the rubber roller and wash it twice.

2. Cleaning the printing roller must use the designated chemical agents, such as industrial alcohol, etc. Never use corrosive solvents;

3. Remove the rubber roller during the holiday break to prevent deformation under pressure;

4. The protection of the surface of the printing roller should be covered with newsprint and placed in a dark place with ventilation.