In order to continuously improve the efficiency of the printing press, people have made unremitting efforts.
When a work piece enters the next printing process, once it has not been completely dried, it will greatly affect the printing efficiency. Therefore, shortening the drying time and improving the efficiency of the printing machine have become a link that needs to be improved.
One of the solutions is double-sided printing with double-sided glazing technology (double-sided tape glazing technology). Although it is not a novel and creative technology, in the past, it was also a fantasy to realize double-sided tape glazing. High-tech technology ultimately makes the impossible possible. With the cooperation of printing machine manufacturers, drying device manufacturers and ink and varnish suppliers, a new production process has completely overturned the traditional production methods. Although this technology is only just beginning, the spark can start a prairie fire, and new technologies have already been applied.
The biggest problem facing the development of this technology is: at normal printing speed, how can the glazed paper be completely dried before turning over and entering the next process. Most printing companies absolutely do not want to see the paper enter the next process without being completely dry.
The drying link is the "culprit" that hinders the combination of two-sided printing and two-sided glazing. Of course, a relatively simple and feasible method is to use UV printing, this method can make the ink and varnish to achieve a good curing effect, to ensure the smooth completion of the printing process. However, the disadvantage of UV printing is that the cost is relatively high, and some jobs cannot be processed. Therefore, finding a relatively suitable aqueous glazing solution becomes the key.
As previously emphasized, the drying process has always been the key to solving this problem. From a technical perspective, an ordinary sheet-fed printing press can dry and polish 15,000 sheets per hour, but it requires a 10-inch drying area. The automatic reversing double-sided printing machine equipped with the glazing unit does not have a 10-inch-long drying area, and only has a maximum of 2 inches. In order to arrange the required drying space, we installed two sets of processing units after the first group of glazing units. The processing unit is composed of an impression cylinder without a plate cylinder or rubber cylinder installed, so that the paper can be turned before With enough drying.
The newly added two processing units bring great convenience to production. First, the drying capacity of the glazed print is improved; secondly, a large amount of heat generated by drying during the printing process is discharged through the real printing unit; third, the processing unit is installed before the double-sided printing cylinder to ensure that the paper is turned over There is sufficient drying time (similar to having a 10-inch drying area) before being fed into the next printing process, which can be "completely" glazed.
The structure of this printing machine can be used for double-sided water-based glazing, but because it is a work-and-turn glazing, it must be dried quickly. In order to achieve a high-gloss glazing effect, a UV lamp can be installed on the printing machine for hybrid curing or UV glazing.
If only UV coating is required, install a UV lamp after the fifth group of printing units, and use UV coating for the first coating unit. The UV curing device is installed at the second processing unit and the last processing unit. The group glazing unit also uses UV glazing, and a UV lamp is added to the rear end of the printing machine for curing.
Of course, if UV glazing and water-based glazing can be performed at the same time, the working range of the printing press will be increased virtually. For example, one job uses full-page flip-type double-sided water-based glazing, while the next job uses high-gloss double-sided UV glazing, or it may be a 10-color direct-printed job. UV coating and water-based coating have greatly improved the working range of the printing press.
This type of printing machine can bring many advantages to double-sided printing jobs: it avoids many feeder problems; the cleaning of the blanket is more convenient; the scrap rate of printed sheets is very low; the customer complaint rate is greatly reduced; the production efficiency is greatly Increase; no drying time, etc.
Of course, the price of printing press is relatively high. But as the saying goes: For every penny you pay, the increase in printing press capabilities can bring customers more competitive advantages. In addition, the improvement of printing efficiency of the printing press can enable the printing supplier to have more sufficient response time when facing the printing buyer.
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Shandong Sinolion Machinery Corp., Ltd. , https://www.sinolion.cc