Talking about the application and advantages of sleeve technology

The sleeve technology mainly includes plate sleeve technology and anilox sleeve technology. In the field of wide-format printing, sleeve technology has been used for many years, but narrow-width printing processors have long been accustomed to sticking photosensitive resin plates on metal cylinders. Until recently, narrow-width printing processors began to consider sleeves. technology. However, the current level of application of the sleeve technology in the narrow-width printing industry is still uneven. Some printing processors often use sleeves, while others use them occasionally.

Advantages of sleeve technology

Undoubtedly, the sleeve technology has greatly helped the wide-format printing industry. For wide format presses, it is important to use a sleeve to ensure quick replacement of the print job. Installing a plate on a 60-inch or longer roller is a very difficult task, and it is more difficult to mount the roller on the press, which requires a large and expensive device to assist in the operation, which is difficult and difficult to operate. It also consumes a lot of time. The operation of replacing the anilox roller is similar. The use of sleeve technology not only saves time, money and labor for wide format printing, it also creates an easier working environment.

In recent years, mid- and narrow-format press manufacturers have begun to offer presses with sleeve technology, enabling mid- and narrow-format presses to be as efficient and flexible as job-changing sleeve presses. Sex. In the case of medium format presses, more and more medium format presses are beginning to use anilox sleeves and plate sleeves because the latest generation of medium format presses use servo drive technology with a cantilevered roller The application of the sleeve is easier. And each of these new models uses a fixed mandrel, and any thickness of the sleeve can be mounted to the mandrel by compressed air.

For the narrow-format printing industry, the narrow-format press has a relatively light drum that allows the operator to install and replace the drum relatively easily, so some narrow-format printers may suspect the use of sleeve technology. This has led to the fact that most printing processors in the narrow-format printing industry have not used sleeve technology. In fact, the use of sleeve technology in narrow-format presses also offers the following advantages.

(1) The cost of the sleeve is lower than the cost of the drum, and more short-run jobs can be produced more economically.

(2) Saving the sleeve directly after printing can save the plate-up work during repeated printing, and can also avoid plate damage.

(3) 360° seamless printing can be achieved using the sleeve technology.

(4) Save storage space. Since the sleeve is used in conjunction with the mandrel, if the diameter and thickness of the two are matched, they can be stored together. Moreover, the weight of the sleeve is much lighter than that of the plate cylinder, which means that the sleeve can be placed on a lightweight bracket designed from cardboard, while the conventional plate cylinder needs to be stored on the reinforced bracket.

(5) Save time. When the job is replaced, the sleeve can be taken out in a few seconds, and the traditional replacement of the plate cylinder takes a lot of time. Moreover, when a job is being printed, the plate of the next job to be printed can be pre-applied to the plate sleeve, saving plate loading time, increasing production efficiency and flexibility.

(6) The sleeve can be loaded and unloaded by one person, and the position can be easily changed or positioned on the air support roller.

Main sleeve technology

Plate sleeve

In the past 4 to 5 years, there are only four or five well-known printing sleeve manufacturers in North America. The printing sleeve technology is very popular in Europe and the development situation is good. This is mainly because European print processors are fully aware of their advantages in printing and believe that the convenience and savings they bring can offset the cost. At present, the main sleeve technologies on the market are as follows.

(1) coating sleeve

This is the most basic type of plate sleeve, made of rubber, commonly used for coating inks, adhesives, clear varnishes and primers, as well as for printing continuous stripes. A corresponding type of ink, such as an aqueous ink or a UV ink, can be selected depending on the rubber type of the sleeve. The most common coating sleeves have an inner diameter of 3 inches and an outer diameter of 3.5 inches.

(2) Laser engraving rubber sleeve technology

The laser engraving rubber sleeve technology directly engraves the graphic on the rubber sleeve and prints directly through the sleeve without loading the plate. The sleeve can be reused and can also be recycled. The picture is directly ablated by a laser beam controlled by a graphic signal, without the need to clean the black film, develop and use the film. In addition, the sleeve will not be deformed during engraving.

The laser engraved rubber sleeve is seamless, so you can design any continuous background pattern, stripes, and very small fine text. In addition, since the sleeve is directly digitally engraved, the multi-color printing has a high overprinting accuracy, which greatly reduces the rejection rate of the printing test machine and the calibration overprint.

The surface tension of laser engraved rubber sleeves ranges from 23 to 32 mN/m. In the case of fine dot printing, a sleeve with a lower surface tension can be selected, and if a solid color block is printed, a sleeve having a higher surface tension can be selected. In addition to the surface tension, the parameters of the sleeve include the surface hardness and chemical composition. The printing processor should select the matching ink according to the performance of the sleeve, such as solvent-based ink, water-based ink, UV ink, offset ink, embossing. Ink or flexo inks, etc.

(3) Seamless thin sleeve technology

Stork is the first manufacturer of flexo sleeves. As early as the late 1980s, Stork developed Seamex, a seamless photosensitive resin sleeve technology. After Stork acquired AKL in Germany, it further expanded its line of flexo sleeves and began to study gravure imaging sleeves. Recently, companies such as Stork AKL and DuPont have jointly introduced the latest seamless thin sleeve technology. This thin sleeve is used with a compressible liner sleeve to ensure extremely high print quality and to share a line and mesh image. Flexographic printing is possible, and the print quality is very high, perfectly replicating all levels and tones from highlights to the field.

(4) Digital plate sleeve technology

Esko's CDI equipment is a universally applied flexographic digital platemaking device that can also be imaged directly on the plate sleeve. At drupa2008, Esko exhibited the latest CDI equipment for large-format plate sleeves and flexographic imaging, primarily for the flexible packaging market. “For the digital plate sleeve technology, the flexible packaging market with a width of more than 50 inches has been regarded as the most attractive market. Of course, the medium (20-30 inches) and narrow flexible packaging markets will eventually Digital plate sleeve technology is used," said Hole, vice president of marketing at Esko Artwork.

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