Self-adhesive printing process characteristics
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The so-called self-adhesive printing is to print the trademark, label, and advertising layout on a special composite paper. The composite paper is coated with a good quality paper (back) and adhered to the surface of the wax. On the bottom paper. When used, as long as the bottom paper is removed, the self-adhesive paper printed with graphics can be directly attached to the product or other objects. Because the self-adhesive printed matter has the advantages of convenient tearing, strong stickiness, flexible use, wide adaptability, and convenient multiple pasting, it is widely used in social and economic life, and the market prospect is very broad.
At present, self-adhesive printing has two processes of offset printing and embossing. The machine structure is divided into three types of embossing: round pressing, round pressing and flat pressing.
Products with large printing layouts, such as advertisements, can be printed with offset or round flat offset presses and embossing machines. The product quality and printing efficiency can be satisfactory. The small-format multi-plate structure and the need for die-cutting, bronzing trademarks and label products are most suitable for printing on self-adhesive label printers. This type of machine has the characteristics of two kinds of printing machines, such as glue and convex printing machine, and a printing mechanism. It adopts roll-type self-adhesive paper, which can complete multi-color printing, hot foil, laminating, die-cutting and winding at one time. Scrap and slitting processes. The machine can be printed with metal plate and resin plate. Thanks to the built-in structure, it can flexibly and conveniently increase or decrease a certain function according to the characteristics of the print. The paper feeding structure and delivery structure of the machine are basically similar to those of the flexographic printing machine, except that a mechanism for controlling the step printing of the paper is added throughout the traveling process. The agency requires strict time control and positioning control, otherwise it will affect the accuracy of overprinting.
When the web sticker is printed, the orientation of the paper is different from the general printing method. It is overprinted by the axial tab movement. That is, three sets of printing plates are simultaneously mounted on the plate cylinder, and when the self-adhesive paper is moved once every time on the imprinting platform, the plate cylinder is reciprocally rotated once in the horizontal direction to realize the printing one color. Printing three-color overprinted labels, the adhesive paper must be moved three times on the platform to complete the full-page overprinting work. The printing structure has the advantages of simplifying the structure of the device and reducing the volume of the machine, but because the printing stroke is short, the printed product is not easy to dry, which is not suitable for completing large-area wet-pressure overprinting, and is suitable for small-area overprinting. Or overprint. From the point of view of the embossed structure, the printing quality of the circular flattening machine is better than that of the flat-pressing machine, especially in the printing of the solid layout, which can achieve a uniform and thick effect of the ink layer. The flat-pressing structure of the self-adhesive machine, printing a large area of the field version is easy to make the layout (printed) to present a "oily" ink layer, the printing quality is not satisfactory, only suitable for small layout printing.
After the completion of the printed self-adhesive products, it is also possible to carry out hot stamping, laminating, die cutting and slitting processes online. Self-adhesive products that work online at the same time, the layout design should fully consider the characteristics of the equipment, and avoid the overprinting of large-area solid layout, so that printing, bronzing, and film can get better results.
Hot foil is an indispensable process for self-adhesive products to occupy the market advantage. Copper plate stickers and plastic film stickers are appropriately decorated with anodized aluminum on the plate, which will greatly increase the added value of the products. However, if the process is not correct, the film self-adhesive anodized aluminum hot stamping such as the layout of the hair, the aluminum foil is not firmly attached, the edge of the edge of the burr and other issues, will seriously affect the market image of the product. Therefore, the underlying ink can not be printed too thick, the process should be as deep as possible, so that the ink hue should be deeper, so that the printing ink layer is thinner to meet the original requirements, and is beneficial to the aluminum foil. It is firmly attached, and it does not cause the problem of hot stamping of the underlying ink. In order to make the hot foil layout clear, the zinc plate should be corroded to a proper depth, so that a certain amount of height difference is formed between the hot stamping plate and the blank portion to avoid eye-opening. Since the foil pressure is correspondingly larger than the printing pressure, in order to avoid the burr of the edge of the aluminum foil surface caused by the deformation of the lining, the pad (pad) should be made of medium-hard material, which has small deformation coefficient and good flatness to ensure hot. The effect of printing makes the quality of batch products consistent. In addition, if the hot stamping effect is poor, and there are quality defects such as hot stamping, fading, and poor adhesion, the above-mentioned conditions cannot be overcome by the process operation measures, and it may be considered to replace the hot stamping foil with better quality grade to improve the hot stamping. effect.
As long as we correctly understand and understand the principles and processes of the self-adhesive printing process, and comprehensively consider the various situations and causes that affect the quality, and take corresponding technical measures, we will be able to print out the various stickers that are welcome by the market. printed matter.