The hottest mirror ink is printed on transparent m

Mirror ink is printed on transparent materials

mirror ink is printed on transparent plastic sheets, such as PC, pet, PVC and PMMA, and printed on the back of these transparent sheets. From the front of the transparent sheet, it looks like the smooth effect of mirror or bronzing surface, so it is called mirror ink. Mirror ink is widely used in the operation panels of washing machines, refrigerators and microwave ovens. At present, mirror ink is also used in the manufacturing of IMD technology, such as, automobile instrument panels and various decorative instrument panels and panels. It can be seen that mirror ink has penetrated into many industries and added light and color to these products. However, compared with ordinary screen printing ink, mirror screen printing ink requires high printing technology. People with certain printing experience and printing skills must print according to the process parameters of mirror ink to achieve satisfactory mirror effect after screen printing. The following suggestions on how to screen the mirror ink are as follows:

first, the characteristics of the mirror ink:

1. The mirror ink is made of special metal powder and resin as the basic material. After screen printing, the mirror effect of metal color can be achieved. To maintain the maximum fluidity of the ink, a large number of special solvents are added to the ink, so the viscosity of the mirror ink is very low, as low as water. Therefore, silk screen printing is difficult, so high-tech printing is required. Otherwise, (1) when there is no printing, the mirror ink has leaked through the silk and contaminated the substrate. (2) During the printing process, on the 15th, 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 slag, which reduces the mirror effect of the print

2. Mirror ink uses the smoothness of the substrate material surface to make the metal powder pigments in the printed ink arrange in parallel on the smooth substrate surface to obtain the mirror effect. Due to this performance of mirror ink, (1) materials with poor surface smoothness of transparent substrate (transparent sheet) cannot get mirror effect. (2) If the transparent substrate material cannot resist the solvent in the mirror ink, it will not get a good mirror effect. (3) After screen printing with mirror ink, the mirror effect is related to the drying method. (4) The operation skills of silk screen printing will affect the mirror effect

II. Printing skills of mirror ink:

1. First of all, we should understand that the mirror ink is as thin as water. The loading beam is the x-axis, and the printing skills are 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 printed continuously and quickly after it is poured on the plate, In order to print smoothly, even if the workpiece is checked while printing, this speed 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 are very important when printing mirror ink. Because the ink is easy to dry on the plate, it cannot be silk printed in an environment with a large amount of air circulation, otherwise it is very easy to block and become gelatinous. At the same time, when the air humidity is high, the mirror effect is poor. Therefore, during silk printing, air flow and humidity should be avoided as much as possible, and dehumidification treatment should be strengthened in the silk printing environment. If the mirror ink is stored at 20 ℃ and screen printed at 20 ℃, the printability will be better

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 80

4. Mirror ink must be fully stirred before use, so that its metal powder and resin should be fully mixed evenly to ensure the appearance of mirror effect, otherwise, it will affect the production of mirror effect

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, so that the mirror effect can be produced

6. During mechanical printing, the ink return knife used should not be made of hard aluminum or stainless steel, but of colloidal ink return knife, so as to ensure that the mirror ink printed by silk screen is evenly coated and the mirror effect is 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. Note that the heating temperature and drying time should be consistent, otherwise the mirror performance and color saturation will also be different

III. recommended screen printing process parameters of mirror ink

1. 270~300 mesh/in wire is selected for version

graphene is used for artificial skin

2. The photosensitive coating is solvent resistant, such as plus II photosensitive adhesive or thin capillary film from cotutay, UK

3. The rubber scraper (scraper) is 80~85

4. Diluent: it is not required under general conditions. If necessary, T-1000 diluent can be added, and it needs to be fully stirred before use

5. Screen printing environment: low temperature, low humidity, continuous screen printing, printing environment does not need air circulation

6. Drying: 10-15 minutes at 80 ℃ is not worth the loss if it is damaged during transportation. 15-20 minutes at 60 ℃ and 20-30 minutes at room temperature

IV. 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. Overlapping printing will cause peeling between metal powders in the mirror ink. If the mirror ink is used on IMD, the mirror ink should be more than 0.5mm away from the cutting edge to prevent damage at the cutting edge of the mirror ink when cutting the edge of PC, etc

3. Transparent and formable sheets of PC and PMMA often have internal stress. During printing, pay attention to the erosion of solvent 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, it is necessary to test before production, or this kind of sheet must undergo aging and anti cracking treatment

4. After printing mirror ink on inorganic glass, it cannot be dried by natural or low-temperature drying, but must be dried above 100 ℃, so that the mirror ink can have good adhesion on glass and also 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 becomes high, it can be diluted with a special diluent, and then printed after the viscosity is restored, but if the mirror oil has caked, the diluent cannot be used

6. The mirror ink should be stored in a sealed container at an ambient temperature of 25 ℃, otherwise it will deteriorate, or it will deteriorate naturally after a long storage time. Once the viscosity becomes high, the ink hardens and discolors, indicating that it cannot be used

v. physical property test results of mirror ink printing film:

test item results test conditions mirror silver No.1 mirror silver No.1 adhesion 100/100 cross cut at 1mm spacing on the ink printing film, and then do the peel test with adhesive paper. Bendability is qualified, 4mm Diameter, 180 degree bending. The secondary processability is good, and the film printing condition of the cutting edge is checked. Good wear resistance, wipe with eraser (500g, 50 times). Good water resistance. Soak in deionized water for 24 hours. Good humidity resistance, temperature 60 ℃, humidity 95% environment for 1 week. Alcohol resistance: add 1kg to the return wire stained with methanol for 10~15 times, wipe it for 15 times, acid resistance for 20 minutes, 5% sulfuric acid solution is added to the printing surface for 20 minutes, observe the time of change, alkali resistance for 3 hours, 5% Noh solution is added to the printing surface for 5 hours, observe the time of change, weather resistance for 1000 hours, and place it in the artificial weather tester for 1000 hours

test conditions:

printing material: transparent plexiglass sheet, bending, PET material during secondary processability test

printing plate: 270 mesh polyester plate

drying condition: 60 ℃ heating and drying for 3 minutes