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No.1
The printing method of self-adhesive
1. Offset printing
Offset printing is the main way for Chinese label printing plants to print paper self-adhesive. Offset printing is characterized by fine graphics, rich layers, suitable for mass printing, and printing equipment can be used in one machine, suitable for the characteristics of the Chinese label market. Offset printing can print thicker plastic materials, such as in-mold labels and label tags, but the machine must be equipped with uv curing devices.
2. Screen printing
Screen printing is the most adaptable printing method for the substrate. Screen printing label ink is strong, strong three-dimensional, can use uv ink printing film products. In addition to a handful of rotary screen printing equipment can be competent for roll-to-roll label printing, most screen printing equipment is semi-automatic flat screen printing machine, can only print single products, overprinting accuracy is not high, not suitable for film label production equipment supporting the production line.
3. Flexo printing
Flexographic printing is mainly popular in North America. Its equipment is a small and medium-sized unit type printing unit, mainly ink, using roll to roll printing, circular die cutting, with high production efficiency, advanced technology and meet the requirements of environmental protection.
4. Letterpress printing
Letterpress printing is based in the Asia Pacific region. Most developing countries in the Asia-Pacific region, label printing is still relatively backward, even if the use of letterpress printing, but the use of UV ink equipment is only a minority, most of the label printing still uses resin ink, roll-to-roll printing and sheet printing coexist. Due to the high proportion of manual labeling, sheet-fed offset self-adhesive labels are widely used. In the mode of die cutting to flat die cutting.
5. Letterpress + flexo printing
This processing method is mostly in Europe, the application of flexographic printing is basically the same as that of the United States, letterpress printing also accounts for 50% of the proportion, and letterpress printing all use UV ink, most of the equipment is stacked or satellite. The material processing method is also roll-to-roll printing.
No.2
The printing process of self-adhesive
Self-adhesive label printing is a special printing, under normal circumstances, its printing and post-printing processing is completed at the label machine, that is, multiple processing processes are completed on several stations of a machine. Because it is online processing, the control of self-adhesive label printing quality is a comprehensive printing and processing problem, which should be comprehensively considered and implemented from the aspects of material selection, equipment configuration and regulation to the formulation of process routes.
When selecting raw materials, we must choose high-quality self-adhesive materials with qualified physical and chemical indexes, rather than products with expired or unstable physical and chemical indexes. Although the latter is low in price, due to the unstable quality of such materials, large consumption in each process, and even lead to normal processing of equipment, waste of raw materials at the same time also waste a lot of manpower and material resources, the processing cost of the finished product label is not necessarily low.
No.3
Self-adhesive printing process
1. Pre-press processing
In the pre-press processing, many customer design orders are based on offset or gravure printing, if this manuscript is flexographic printing, there will be a lot of quality problems, such as color is not in place, the level is not obvious, there are hard edges and so on. Therefore, in order to solve such problems, timely communication before press is very necessary.
2. Plate selection
In the choice of flexographic plate material is also very skillful. Professional plate making personnel in printing enterprises need to fully understand the use of plate materials, the production of cable plates, the transition of levels, the increase of network point compensation, and the expansion rate of plates. This is not only conducive to production, but also can control the quality parameters, avoid human interference, and reduce the occurrence of faults.
3. Equipment selection
Due to the particularity of label printing, narrow-width flexographic printing equipment has outstanding characteristics compared with letterpress printing and other types of flexographic printing equipment, narrow-width flexographic printing equipment is not only simple operation, high printing quality and operating efficiency, strong combination, can do more kinds of products, more competitive strength.
