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Sheetfed offset + flexo on-line processing In the field of packaging and printing, even in the rapidly developing short-run printing market. Many sheetfed offset presses are equipped with flexo glazing units. The flexo printing unit is equipped with a closed squeegee device and anilox roller, and is not only used for coating, but also capable of overprinting good prints. The usual usage is that the flexo printing unit at the back of the offset printing unit is used for on-line coating or other effects of the printing; and the flexo printing unit at the front of the offset printing unit can perform surface preparation on the printing material, such as gold and silver cards. The paper or transparent plastic surface is coated with a layer of opaque coating, followed by an offset printing process. Prior to printing, the substrate is treated with pearlescent coating to produce a creamy effect on the printed image. This is a method of processing that is of interest to many fashion clients.
The advantages of offset printing are good print quality, low cost before printing and printing plates. On the other hand, flexographic printing has its advantage in that the ink layer is thicker, so that more pigments enter the interior of the substrate and the machine structure is simpler. The viscosity of flexographic ink is very similar to that of gravure ink. Compared with offset printing process, the flexographic ink layer is thicker and even forms a layer of ink “coatingâ€. The ink layer thickness changes with the change of the anilox roller. The diameter of the metal pigment particles in the offset ink is at most 3.5 μm, while the metal pigment particles of the gravure and flexo inks can reach 9 μm. The main uses of the flexo printing machine on the offset printing press include white ink primer, pearlescent coating, foam coating, metallic gloss coating, UV coating, and waterborne coating.
Off-Shelf Sheetfed Flexo Press A sheetfed offset press equipped with a flexo unit has evolved into a simple sheet-fed flexo/glazing machine that is logically developed. Sheetfed flexo presses are common in corrugated board printing. In addition, the new packaging printing sheet-fed offset printing machine is equipped with a gripper paper delivery system to ensure that the paper is accurately transferred between the units. The printing range extends from plain paper to 1.25mm thick cardboard.
The structural design of the sheetfed flexo press is similar to that of a sheet-fed offset press equipped with two flexo printing units. It can also be used solely for UV coating or other effects. Special glazing processes require thick coatings, such as glazing, glazing, sizing, pearlescent glazing, and metallic glazing, which require precise coating thickness. If the glazing method is often replaced, two glazing units can be provided, one for waterborne glazing and the other for UV glazing.
High-quality packaging and printing processes generally go through many processing processes. Therefore, most of the printed products must go back and forth several times between the glazing unit and the flexo printing unit. If the flexo printing machine is used for coating and multi-color printing, the production process The "bottleneck". In terms of technology, the use of off-line sheet-fed flexo presses is an option for the high-quality packaging and printing market.
Application of UV Technology in Sheetfed Offset UV print sales have grown three times faster than conventional offset printing products. UV technology represents high quality. On-line processing means high efficiency, uniform product, no harmful substances, and is conducive to environmental protection. In particular, UV glazing can be fixed instantly, making the product more glossy and has good wear resistance.
However, the use of UV printing technology requires training of new technology for employees, increased equipment investment, material and UV curing costs, planning of the timing between conversion of UV printing and conventional offset printing, and adjustment of printing characteristics, reducing the odor of UV prints is UV printing Problems to be solved. However, the advantages of UV printing far outweigh the disadvantages. Especially for packaging printing, due to the large number of non-absorbent printing materials used, this poses a severe challenge to packaging design, packaging printing and label printing.
Overwhelming product advertisements are increasing. In the face of dazzling arrays of goods, many consumers may choose to rely solely on packaging, which is visually appealing. Therefore, packaging of goods offers attractive opportunities for printing machinery manufacturers. At the Drupa 2004 print media exhibition, packaging and printing processing technology will become a central topic. Equipment suppliers of various processes will exhibit new processing solutions. These programs can print materials such as various types of new plastic films with different surface characteristics and novel color effects. However, the more processing elements, the more complicated the process. Before investors make investment equipment decisions, it is important to carefully consider which process is best for your printed product, which jobs can be printed and which new markets can be developed.