Komori and double-sided tape coating technology

In order to continuously improve the efficiency of the printing press, people have made unremitting efforts.

When a job 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 press become a link to be improved.

One of the solutions is double-sided printing with double-sided coating (double-sided coating technology). Although it is not a novel and creative technology, in the past, it was “Arabian Nightspots” to realize the double-sided application of light. High-tech eventually made it impossible to become possible. With the cooperation of printer manufacturers, dryer manufacturers, and ink and coating oil suppliers, a completely new production process completely overturns traditional production methods. Although this technology has only just begun, the fire of the stars can be a pity, and new technologies have begun to be applied.

(Lithrone S40 sheet-fed duplexer)

(Lithrone S40P Reversible Double-sided Printing Machine)

The biggest problem facing the development of this technology is how to make it fully dry at the normal printing speed before the coated paper is turned over and moved to the next process. Most printing companies do not want to see the paper enter the next process without fully drying out.

Drying is the "culprit" hindering the combination of two-sided printing and two-sided coating. Of course, a relatively simple and feasible method is to use UV printing. This method can make the ink and coating oil achieve a good curing effect to ensure the smooth completion of the printing process. However, the disadvantages of UV printing are the high cost and the inability to process certain jobs. Therefore, finding a relatively suitable water-based coating solution becomes the key.

As has always been emphasized above, the dry link has been the key to solving this problem. Technically speaking, an ordinary sheet-fed press can dry and polish 15,000 sheets per hour, but it requires a 10-inch-long dry area. The automatic reversible perfecting machine with a glazing unit does not have a 10-inch dry area and only a maximum of 2 inches. In order to arrange the required drying space, we installed two sets of processing units behind the first group of glazing units. The processing units consist of impression cylinders without a plate cylinder or a blanket cylinder, so that the paper can be turned before With enough dryness.

The two newly added processing units have brought great convenience to production. First of all, the drying ability of the glossy print is improved; secondly, the large amount of heat generated during the printing process is discharged through the actual printing unit; and third, the processing unit is installed before the double-sided printing cylinder, ensuring that the paper is turned over. Before entering the next printing process, there is enough drying time (like a 10-inch-long drying area) that the coating can be “completed”.

The construction of this press is capable of two-sided water-based glazing, but due to the work-and-turn glazing, rapid drying must be performed. In order to achieve a high-gloss finish, a UV lamp can be mounted on the press for mixed curing or UV coating.

If only UV coating is performed, a UV lamp is installed after the fifth printing unit, and the first coating unit uses UV coating. 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 at the rear end of the printer for curing.

Of course, if UV glazing and water-based glazing can be performed at the same time, it will virtually increase the operating range of the printer. For example, one job uses a full-length flip-over double-sided water-based coating, while the next job uses a high-gloss double-sided UV coating, which may also be a 10-color direct-print job. UV coating and water-based coating have greatly improved the working range of the printing press.

This structure of the printing press can bring many advantages for the double-sided printing job: avoiding many issues of feeders; blanket cleaning is more convenient; the rate of rejection of printed sheets is very low; customer complaint rate is greatly reduced; Improve; no drying time, etc.

Of course, the price of printing presses is also relatively high. However, as the saying goes: One penny and one cent, the increase in printing capacity can bring more competitive advantages to customers. Moreover, the increase in the printing efficiency of the printing press enables the printing supplier to have a more adequate response time when facing the printing buyer.