The so-called self-adhesive printing is to print trademarks, labels, advertising layout patterns on special composite paper, the composite paper is a better quality facial paper (back) coated with self-adhesive, adhered to the surface and wax Bottom line. Stickers can not only stick, but also design, printable text and exquisite patterns. Since many materials are used for self-adhesive labels, a variety of printing methods are available. Such as screen printing, offset printing, flexographic printing, letterpress printing, inkjet printing, etc., and different countries and regions prefer different printing methods. For example, the North America region represented by the United States and Canada is a typical representative of a flexographic printing sticker. The equipment is a unit type printing unit, the ink is mainly water-based ink, and the die is round and round. The processing method of the material is roll paper printing, roll paper collection. Some European countries mainly choose letterpress and flexographic printing. The situation of flexographic printing labels is the same as in the United States, but letterpress printing occupies a considerable proportion. All of the relief printing uses UV ink, and the equipment is mostly stacked or satellite. The processing method of the material is also roll paper printing and roll paper collecting. In the Asia-Pacific region, label printing is relatively backward due to the majority of developing countries. There are only a few devices that use ink in letterpress printing, and most labeling devices still use traditional resin-based inks. The processing method of the material is roll paper. In the country, the main private and family workshop-style production uses screen printing as high as 97%. Small and medium-sized private printing companies have more popular products for processing and printing, which determines their market share and become the most important production method in China Machine printing has become the development trend of the printing industry, and more and more large domestic printing companies have introduced flexographic printing machines.
Due to the difference in the use of stickers and labels, the printing process used is also different. Generally label printing machine is a multi-function device, and the processing plant can formulate printing process according to the requirements of customers. The general label printing process can be divided into:
(1) Unwinding: It can be divided into intermittent type (no tension changes when the roll paper is unrolled, so no adjustment is required. Shanghai self-adhesive printing is applied to flattening and round flattening label machines, and the unwinding speed is slow. This type of equipment does not have a paper positioning correction device, which requires a clean end surface of the roll paper to ensure accurate overprinting during printing) and continuous (applied to the rotary and round labeling machine. Because the roll paper diameter and speed change, the paper tension changes , So this device has tension automatic or manual control mechanism, as well as roll paper correction correction device to ensure smooth paper feeding and print quality).
(2) Bronzing: Bronzing is an indispensable process for self-adhesive products to gain market advantage.
The copperplate stickers and plastic film stickers are properly decorated with anodized aluminum on the plate surface, which will greatly increase the added value of the goods. However, if the process is improper, the problems such as flowering of the layout, poor adhesion of the aluminum foil, and burrs on the edge of the layout will be seriously affected by the film aluminum foil hot stamping, which will seriously affect the market image of the product. Therefore, the background ink should not be printed too thick, and the process should be as deep and thin as possible, that is to say, the hue of the ink should be adjusted deeper, so that the printed ink layer is thinner to meet the original requirements, and it is beneficial to aluminum foil The firm adherence, and at the same time, it will not cause the hot stamping defect of pulling off the background ink. In order to make the hot stamping plate clear, the zinc plate should be corroded a little deeper, so that the hot stamping plate and the blank area form a certain amount of height difference to avoid eye-catching. Since the foil stamping pressure is correspondingly higher than the printing pressure, in order to avoid the compressive deformation of the lining and the occurrence of burrs on the edges of the aluminum alloy plate, the pad (liner) should be made of medium-hard materials, which have a small deformation coefficient and good flatness to ensure ironing. The printing effect makes the quality of the batch of products consistent. In addition, if the hot stamping effect is not good, if there are quality defects such as hot stamping, flowering, and poor adhesion, and the above measures cannot be overcome in the process operation measures, consider replacing the hot stamping foil with better quality to improve hot stamping effect. Bronzing can be divided into flat flattening (applied to round flattening, flat flattening label machine, low speed), round flattening (applied to round flattening label printing machine, fast speed, continuous hot stamping, generally rarely used, generally Use gold printing process instead of bronzing) two.
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