The high-quality fountain solution and blanket can greatly reduce the waste sheets when the rotary offset press is turned on.
Rotary offset printing refers to an offset printing method that uses continuous web printing, and has the characteristics of fast printing speed, short production cycle and high printing efficiency. However, this printing method will lead to high waste sheet loss, especially when the machine is turned on and adjusted, more printing waste sheets will be generated. If it is possible to reduce the printing waste sheets when the rotary offset printing is turned on, the printing loss can be reduced, the rotary offset printing cost can be reduced, and green printing can be realized.
Web offset printing uses web material. Once the offset press is started, the ink transfer, ink balance, printing registration, and ink color adjustment will consume paper until the printing is officially started. Rotary offset printing needs to be printed on white paper from the start of the printing machine. Unlike flat sheet offset printing, the use of overprinted paper for start-up adjustment before formal printing reduces paper consumption. Although the printing speed of the rotary offset press is high, up to 1000 meters per minute, which is much higher than the speed of 150,000 sheets per hour of flat sheet offset printing, but the loss of printing materials is also high, especially with drying, folding, stacking, etc. The connection of post-press processing operations, the adjustment of post-press processing will also increase the boot scrap.
It is unavoidable to use white paper in the rotary offset press from the start-up. Therefore, in order to reduce the waste of starting sheets, it is necessary to reduce the time of starting adjustments and the number of times of manual starting, thereby reducing the consumption of web paper.
The start-up adjustment is mainly to adjust the parameters of the printing process, and the printing process to be adjusted is mainly ink-water leveling and printing pressure. In the short time of starting adjustment, it is necessary to obtain printing ink with clear graphics, rich gradation (levels) and colorful colors, and the fountain solution should be quickly spread on the non-graphic surface of the printing plate and form a uniform layer of water The film prevents the ink on the surface of the graphics from seeping to the non-graphic surface, ensuring the clarity and stability of the graphics. The acid and hydrophilic colloid in the fountain solution can react with the base metal and physical adsorption reaction of the non-graphic parts exposed by abrasion to form a new hydrophilic layer to maintain the stable affinity of the non-graphic parts of the printing plate Water-based.
In addition, the fountain solution can effectively control and reduce the surface temperature of the printing plate under the conditions of high-speed printing; under the action of printing pressure and high-speed operation, it can maintain the relative stability of the fountain solution and the ink, so that the degree of emulsification of the printing ink is Minimize, speed up to achieve the water-ink balance required for high-speed printing, and also have a cleaning function for the ink that adheres to the non-graphic parts of the layout.
The printing pressure is the elastic force generated by the compression and deformation of the blanket and liner. Choosing a suitable high-speed rotary offset air cushion blanket can reduce the time for startup adjustment, which not only reduces the production cost, but also guarantees the printing quality, especially the rotary offset printing. The expansion rate of the machine's dot transfer is reduced, so that the accuracy of the tone and color restoration is improved.
In short, in the adjustment process of high-speed rotary offset printing, the use of high-quality fountain solution and air cushion blanket helps the printer to print high-quality products in the shortest time, thereby reducing the waste of startup. Although the cost of high-quality fountain solution and blanket for rotary offset printing is slightly higher, the benefits brought by it will greatly improve the production efficiency and economic benefits of rotary offset printing.
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