Application of surface decorative screen printing ink (1)

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The definition of printing ink is based on the difference in the printing method, so that graphs represent the materials on the substrates, in addition to physical functions such as optical functions and conductive functions, and chemical and chemical resistance functions. Sexual function, any ink that has been specially given a surface decoration function through a special printing process, is called a functional ink (see Figure 1).

From the perspective of the use of these functional inks, such as the performance of insulating inks and conductive inks, one is to exert the original function, not to be exposed on the surface of the concept, and to use it as a component material of the product, and the other is Like the functional inks of the surface decoration classification, the purpose of the process concept expression of the product is unambiguously used. The other classified functional inks are also part of the final product process design, and are used for surface decoration purposes in order to constitute the process design method. the use of.

Recently, for the purpose of product differentiation and high value-added products, high-functionality inks such as mirror metal and black-light color inks have also been incorporated into a part of the process design, and are formed by insert molding and transfer. The demand for surface decorative applications in design has culminated. This article focuses on functional inks that are actually used in surface decoration.

Physically functional inks

1. The role of optics

(1) black light ink

    Functional ink with optical function, there is a black light color ink. This is a kind of ink that only sees white under sunlight or general illumination, but when it is irradiated with ultraviolet light such as black light, it becomes an inorganic phosphor-incorporated ink that can give off a vivid fluorescent color, showing green, yellow, red and pink. Fluorescent color changes of purple, blue, white, etc. An inorganic fluorescent material was used as a chromogen, and it was prepared by dispersing it in a suitable adhesive for use.

Representative products of inorganic phosphors are as follows:

Red - Y2O3:Eu

Blue - ZnS: Al

Green - ZnS: Cu

The characteristics of these three primary colors are shown in Table 1.

This ink is superior in heat resistance, solvent resistance, and chemical resistance as compared with general fluorescent inks. Can be used for 100 ~ 200 screen printing, as a standard color, there are green, yellow, orange, red, pink, purple, blue, white, etc., can be allocated with many colors.

As for the light source (black light) used for hair coloring, there are a fluorescent tube type, a light bulb type, and a condenser light projector type. Purple light color ink can be used in display screens, fibers, marking agents, anti-counterfeiting, automotive calculations and other aspects.

(2) Luminous ink (luminous ink)

The luminous ink that uses a light-storing pigment also belongs to this category. It absorbs light energy such as sunlight and electric light and accumulates it. It temporarily emits its accumulated light energy and emits light, that is, it glows in a dark room after the light is turned off. The time is up to 20 to 30 minutes. Recently, it has become a light-storing pigment that uses 8 to 10 times the luminance and light-emission time of the past. In terms of color, it emits light of green, red and blue. In order to increase the brightness of the residual light, it will be used as a light-storing pigment. The addition amount of the resin component is 1:1 to a greater extent, and the ink film is made thicker, and the printing is performed using a screen mesh of 100 to 180 meshes. The measurement of the change in the luminance of the afterglow of each color of the phosphor is shown in Table 2.