Application of mirror and mirror photochromic ink

Mirror photochromic ink is a kind of mirror ink with special effect. It is printed on the transparent plastic material (back side) and uses light interference on the front face to change the color of the ink with the change of viewing angle. The effect of the effect. Printed on a variety of substrates to get a unique sense of color and high-level sense. In recent years, there has been an increase in the use of mirror photochromic ink printing products, such as communicator buttons, electronic product panels, and plastic signs, etc., which are popular among users and have increased the value and selling point for silk screen printing products, but have been compared with ordinary printing inks. In contrast, such mirror-like photochromic inks require a high degree of printing techniques and techniques. Here's the characteristics of the mirror ink, printing method, storage and precautions, briefly described below, I hope to be able to use a good mirror ink to help:

1, the type of ink:

Divided into ordinary mirror ink (silver and metal colors) and mirror photochromic ink. General mirror inks have a wide range of applications, such as IMD technology used in mobile phone keypads, washing machine operation panels, microwave function indicator panels and signs, and decorative parts on electronic products; while the use of mirror light color inks are decorative It is even more superior to the ordinary mirror ink, making the product more beautiful.

2. Substrates used for surface inks:

There are several kinds of transparent sheets, and they are printed on the opposite side (back side). The effect is seen on the front. The transparent sheets used are: PC (polycarbonate), PMMA (acrylic or plexiglass), hard PVC (polyvinyl chloride), and treated PET (polyester). The mirror ink has adhesiveness to the above-mentioned transparent sheet, and the mirror surface and mirror surface color change effect can be obtained. It is worth noting that PC or PMMA finished products, due to their different materials and processing techniques, some will be due to poor solvent resistance and can not get a good mirror or mirror change effect, so you must do a sample test before use, Confirmed before production. Not only that, in order to get a mirror effect, in addition to the above, because the mirror ink is a special aluminum powder pigment and a small amount of resin and other basic materials, and the aluminum powder pigment is a sheet, in the surface parallel to the mirror reflection performance Therefore, materials with poor surface smoothness (substrates) and materials that cannot withstand the solvents in ink are not able to obtain a good mirror effect.

3, screen printing mirror ink characteristics:

(1) In addition to a small amount of resin and flake aluminum powder pigments, the solvent accounts for more in the mirror ink, so the viscosity of the mirror ink is very low. When screen printing, as much as possible, do not use tilt-opening screen, otherwise the flow is more powerful. Therefore, regardless of manual or machine printing, parallel-elevation screens should be used to make the dilute, water-filled ink always full on the screen, so as to avoid or reduce the impact of screen-blocking and screen printing.

(2) If the screen printing machine is used for printing, the metal re-inking scraper should be replaced with a rubber-made re-inking scraper to make the ink evenly coated on the screen.

(3) When the mirror ink is screen printed, the range of coating on the web should be controlled as close as possible to the range of the printing area of ​​the effective graphics. Otherwise, due to the large coating area, the solvent in the mirror ink quickly volatilizes to cause blocking of the web and cannot be continuous. Printing and so on.

(4) The mirror-like ink is quickly volatilized on the Internet. To prevent blocking of the screen, be sure to print continuously while printing, and care must be taken not to allow the flowing air to dry the screen.

(5) Thickness of the ink film is too thick, the peeling phenomenon occurs between aluminum pigments in the ink. Therefore, it is recommended that the ink be printed as thin as possible. Note that the mirror ink cannot be overlaid and printed.

(6) Mirror-type ink itself does not have good shielding performance. In order to obtain a good mirror surface and its mirror color-changing effect, a layer of cover-type ink must be added. This type of printing ink should be coated with a mirror and a color-changing mirror ink. Solvent-free inks are not produced.

Mirror ink is a high-grade, decorative ink, thin as water, silk screen printing is also very volatile, if the printing environment is not good, printing technology is not in place, so there will be increased in the printing and blocking the number of network, but also Causes the ink on the substrate to be uneven.