Production process of forming stereo relief effect on packaging printing paper base

Abstract

The invention provides a production process of forming stereo relief effect on a packaging printing paper base once by means of gravure printing. The production process includes overprinting UV (ultraviolet) gloss on a paper base with printed pictures and texts by means of gravure printing and positioning once, and using ultraviolet for drying to form the stereo relief effect. The ink cell depth of a gravure ranges from 60 micrometers to 70 micrometers, the opening width ranges from 20 micrometers to 140 micrometers, and viscosity of the UV gloss measured by NO.2 Zahn cup at 25 DEG C ranges from 20s to 40s. The gravure plate with specific lightscribe parameters is used with the UV gloss of the certain viscosity, transfer quantity of the UV gloss can be increased as much as possible while high flowabiity of the UV gloss is guaranteed, the paper base with the printed pictures and texts can have the relief effect similar to screen printing gloss after monochrome group printing, and accordingly production efficiency is greatly improved, and troublesome of overprinting for multiple times can be avoided. Further, web graphic printing and gloss printing integrated production can be realized, and precision of overprinting can be better improved.

Description

technical field [0001] The invention relates to a post-press processing technology in the packaging and printing industry, in particular to a production process for forming a three-dimensional relief effect on the surface of a printed product, and more particularly relates to a method for forming a three-dimensional relief on a packaging printing paper base by gravure printing at one time. The production process of the effect. Background technique [0002] In order to make the surface of the printed matter have a three-dimensional relief effect and make it more high-end and realistic, there are usually two methods. One is to use a pre-made template with a concave-convex structure to mold the printed matter; the other is to achieve it through embossing. It is realized by screen printing UV embossing oil and then drying by ultraviolet light. UV embossing oil is a kind of UV varnish with foaming function. The first method requires heating and pressure during the molding proce...

AI Technical Summary

Problems solved by technology

The first method requires heating and pressure during the molding process, and the process is relatively simple, but the three-dimensional relief effect is not distinctive; the second method can make the surface of the printed matter have a good three-dimensional relief effect, but has the following disadvantages: (1) Production efficiency Low, a fully automatic screen printing machine can only produce 2200 sheets per hour, about the line speed of 20m / min, the production capacity cannot meet the requirements of mass production; Requirements for overprinting accuracy; (3) It is impossible to achieve continuous production with roll gravure printing machines. After gravure printing, the products need to be cut into large sheets and then embossed by silk screen, which not only delays the production cycle, occupies too much production space, but also increases labor costs.

The above-mentioned patent application realizes post-press bulge by increasing the solid content of the printing ink, but since the printing ink used is a solvent-based ink, when the solid content is too low, the printing layer evaporates with the solvent during the drying process. The ink layer will become thinner, and the convexity will not be obvious, and it must be overprinted many times to reach a certain convex height; and when the solid content is too high, on the one hand, the fluidity of the ink will become poor, and the ink will not easily transfer from the gravure to the paper, resulting in The amount of transfer is not enough. On the other hand, the ink scraper is not easy to scrape clean, and it is easy to cause the blank area to be dirty; Conducive to environmental protection

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