Analysis of the principle and process of sticker printing

Sticker printing is generally to print labels, advertising layout patterns and trademarks on special composite paper. Composite paper is generally selected from better quality facial paper (back) coated with self-adhesive glue and adhered to the bottom of the surface On paper. In use, as long as the bottom sheet is removed, the self-adhesive paper printed with pictures and text can be directly pasted on the commodity or other objects. Because the self-adhesive printed matter has the advantages of easy tearing, strong adhesiveness, flexible use, wide adaptability, and easy to paste multiple times, it is widely used in social and economic life, and the market prospect is very broad.

At present, there are two processes of self-adhesive printing: offset printing and embossing. The machine structure can be divided into three types: round and round, round and flat. Products with large printing areas such as advertisements are printed with round or round flattened offset presses and letterpress presses. The product quality and printing efficiency can be satisfied. The trademark and label products with small format and multi-imposition structure and die-cutting and bronzing are most suitable for printing with self-adhesive trademark printers. This type of machine has the characteristics of the uniform ink and printing mechanism of the two printing machines of glue and convex. The roll-type self-adhesive paper can be used to complete multi-color printing, foil foiling, laminating, die cutting and rewinding at one time. Processes such as scraps and slitting. The machine can use metal plate and resin plate printing, because of the use of building block structure, according to the characteristics of the printed matter, flexible and convenient to add or remove a functional part. The paper feeding structure and paper collecting structure of the machine are basically similar to the flexographic printing machine, the difference is that a mechanism that can control the paper step printing is added during the whole traveling process. The agency requires strict time control and positioning control, otherwise it will affect the correct overprint.

The direction of the paper during web sticker printing is different from the general printing method. It uses axial jigging to achieve overprinting. That is, three sets of printing plates are installed on the plate cylinder at the same time. When the adhesive paper jumps once on the platen, the plate cylinder rotates back and forth once in the horizontal direction to realize printing once. For printing three-color overprinted labels, the sticker must be moved three times on the platform to complete the full-page overprinting work. The advantage of this printing structure is that it simplifies the structure of the equipment and reduces the size of the machine. However, because the printing stroke is short, the printed product is not easy to dry, which is not conducive to the completion of wet-pressure wet-overprinting on a large area, but is more suitable for small-area overprinting Or overprint. From the point of view of embossing structure, the printing quality of the round flat sticker is better than that of the flat pressing machine, especially in the field of printing on the solid surface, it can achieve the good effect of even and thick ink layer. The self-adhesive machine with flat and flat structure, printing large-area solid plates easily makes the layout (prints) appear "oil flower" -like ink layer, the printing quality is not satisfactory, only suitable for small layout printing.

After printing, the self-adhesive products can also be used for hot stamping, laminating, die cutting and slitting processes. For the self-adhesive products with online homework, full consideration should be given to the characteristics of the equipment when designing the layout, to avoid overprinting of large-area layouts on the ground, so that printing, bronzing, and laminating can obtain better results.

Foil foiling is an indispensable process for self-adhesive products to gain the upper hand in the market. Copper plate stickers and plastic film stickers are properly decorated with anodized aluminum on the plate surface, which will greatly improve the added value of the goods. However, if the process is improper, problems such as embossing of the layout, poor adhesion of the aluminum foil, and burrs on the edge of the layout will appear on 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 surface clear, the zinc plate should be eroded to a certain depth, so that the hot stamping plate surface and the vacant part form a certain amount of height difference, so as not to cause eye-catching. Because the foil stamping pressure is correspondingly greater than the printing pressure, in order to avoid the compressive deformation of the lining and the occurrence of burrs on the edge of the aluminum plate, the pad (liner) should be made of medium-hard materials. Its deformation coefficient is small and the flatness is good. 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, the process manipulation measures cannot overcome the above situation. Consider replacing the hot stamping foil with better quality to improve the hot stamping.印 结果。 Printing effect.

As long as we accurately grasp and be familiar with the principle and process of the self-adhesive printing process, and comprehensively consider the various situations and reasons that affect the quality, and take appropriate technical measures, we can print all kinds of product quality that are welcomed by the market. Sticker prints.

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