Four aspects of the hottest special gloss printing

All aspects of special gloss printing technology (IV)

(II) mirror ink printing anti-counterfeiting technology

the technical problem of durometer conversion is "mirror ink". It is a metal colored silk screen printing ink, which belongs to solvent volatile ink, and is made of plastic resin mixed with special metal colored powder. It is used for cleaning and printing on the back of transparent plastic sheets (polyester sheets, PC sheets, PVC sheets, PMMA, etc.) with a steel brush dipped in gasoline, Get metallic mirror or bronzing printing effect

1 classification and applicable materials of mirror ink

Seiko mirror ink has three kinds, which can be selected according to the printing material and purpose

mirror ink class B: only applicable to polyester sheet (PET), with excellent mirror effect and strong tightness to pet

mirror ink NO2: printable polyester sheet (PET), PC, PVC, PMMA

mirror ink No3: used for mirror effect printing of other colors. The experimental space that can be used for p aluminum alloy wood flooring is usually heightened and widened, such as et, PC, PVC, PMMA, and has colors of medium gold, red gold, green gold, etc

color mirror ink N03. There are Zhongjin, red gold and cyan gold, which are colored mirror inks with high viscosity. They can print pet, PC, PVC and pmma:

2. The characteristics of mirror inks

(1) mirror inks are made of special aluminum powder and a small amount of resin beneficial to accelerating the green building revolution as basic materials, so that they can achieve the mirror effect. Due to the need to maintain the maximum fluidity of the ink, Therefore, a large number of special solvents are added to the ink. Therefore, the viscosity of the mirror ink is very low, as low as water. Therefore, the difficulty of silk screen printing requires high-tech printing and horizontal printing. Otherwise, before printing, the mirror ink has leaked through the silk and contaminated the substrate. In addition, in the printing process, the mirror ink is very easy to dry. In addition to being easy to block, it will also make the dry mirror ink accumulate on the surface and become "silver residue"

(2) mirror ink uses the gloss performance of the substrate material surface to make the aluminum pigment in the printed ink arrange in parallel on the smooth substrate surface to obtain the mirror effect. Because the mirror ink has this property, the material with poor surface smoothness of the first transparent substrate (transparent sheet) cannot get the mirror effect; Second, if the transparent substrate material cannot resist the solvent in the mirror ink, it will not get a good mirror effect; Third, after the mirror ink screen printing, the mirror effect is related to the drying method; Fourth, the operation skills of silk screen printing will affect the mirror effect

3 printing technology of mirror ink

(1) first of all, we should understand that the mirror ink is as thin as water, and the printing skill is the key. When the printing speed is slow, on the one hand, the mirror ink as thin as water will leak out of the plate, on the other hand, the mirror ink is easy to absorb moisture in the air, and the mirror effect after printing is not good. Therefore, when printing, the mirror ink must be continuously and quickly printed after pouring into the plate in order to complete the printing successfully, That is, the speed of checking the workpiece while printing will have an impact on the printing effect, such as blocking, ink printing cannot continue, slagging on the plate, etc

(2) the ambient temperature and humidity when printing mirror ink is very important, because the ink is easy to print on the plate, so it cannot be silk printed under the air circulation, otherwise it is very easy to block. When the air humidity is high, the mirror effect is poor, so when printing on silk. Avoid air flow and humidity as much as possible

(3) since the ink is as thin as water, high mesh silk should be selected. Not only that, the hardness of the rubber scraper should be harder, which can be more than 800

(4) mirror ink must be fully stirred before use, so that its aluminum powder and resin should be fully mixed evenly, otherwise, the mirror effect will be affected

(5) the tension of the version is slightly lower, the distance is also adjusted closer, and the scraping pressure of the scraper is appropriately reduced, otherwise the generation of mirror effect will be destroyed

(6) during mechanical printing, the ink return knife used should not be hard aluminum or stainless steel, but should be colloidal ink return knife. Ensure that the mirror ink printed by silk screen is evenly coated to make the mirror effect consistent

(7) the mirror effect of mirror ink is related to the drying method. In terms of mirror effect, natural drying is not as good as heating drying, and pay attention. The heating temperature and drying time should be consistent, otherwise the mirror performance and color saturation will also be different

4 precautions for using mirror ink

(1) if other series of inks need to be covered on the mirror ink, the series of inks that do not erode the mirror ink should be selected, otherwise, the effect of the mirror will be damaged

(2) the printing mirror ink must be thin and uniform. At the same time. The mirror ink itself cannot be overlapped, otherwise, the aluminum pigment in the mirror ink will peel off

(3) for the transparent and formable sheets of PC and PMMA, there is internal stress in the solid. During printing, pay attention to the erosion of solvents on these materials, which will not only lose the mirror effect, but also release the stress and crack the material under the action of solvent. Therefore, before silk screen printing, be sure to test before production

(4) after printing mirror ink on inorganic glass, it cannot be dried by natural or low-temperature drying, but should be dried at above 1000C, so that the mirror ink can have good adhesion on glass and show good mirror effect

(5) since the mirror ink is as thin as water, no diluent is usually added; It is worth noting that when the viscosity of Seiko mirror ink becomes high in the process of silk printing, it can be diluted with special T-1000 diluent, and then printed after the viscosity is restored, but the diluent cannot be used after caking

(6) the mirror ink should be stored in a sealed container with an ambient temperature of ＜ 250C, otherwise it will deteriorate. Or it will deteriorate naturally if it is stored for a long time. Once the viscosity becomes high, the ink will harden and change color, indicating that it cannot be used. (to be continued)