Mirror inks are printed on transparent plastic sheets, such as PC, PET, PVC, and PMMA, printed on the back of these transparent sheets, and look smooth from the front of the transparent sheet, such as with a mirror or bronzing surface. So called mirror ink. Mirror inks are widely used in the operation panels of washing machines, refrigerators, and microwave ovens. At the present time, mirror inks are used in IMD technologies, such as mobile phones, car dashboards, and various decorative dashboards and panels. It can be seen that the mirror ink has penetrated into many industries, adding color to these products, but mirror inks and ordinary screen printing inks, mirror screen printing inks require high printing technology, must have a certain printing experience and printing skills In accordance with the process parameters of the mirror ink to print, after the screen printing to achieve a satisfactory mirror effect. Here's a suggestion on how to print good mirror inks as follows:
First, the characteristics of mirror ink:
1. Mirror ink is made of special metal powder and resin as the basic material. After silk screen printing, it can achieve metallic mirror effect. Due to the need to maintain the maximum fluidity of the ink, the ink adds a large amount of special solvents, so the viscosity of the mirror ink is very low, as low as water, so the silk screen is more difficult, requiring high-tech printing level printing, otherwise, (1) When there is no printing, the mirror ink has leaked through the screen and is contaminated with the substrate. (2) In the printing process, the mirror ink is extremely easy to dry, in addition to easy blocking the network, but also make the dry mirror ink accumulated on the Internet, as a "silver slag" and reduce the mirror effect of the print.
2. The mirror ink uses the smoothness of the surface of the substrate material, so that the metal powder pigment in the printed ink is arranged in parallel on the surface of the light-printed substrate to obtain a mirror surface effect. Since the mirror ink has such a property, (1) a material having poor surface smoothness on a transparent substrate (transparent sheet) cannot obtain a mirror surface effect. (2) If the transparent substrate material is not resistant to the solvent in the mirror ink, good mirror effect will not be obtained. (3) After mirror ink printing, the mirror effect is related to the drying method. (4) Screen printing operation skills will affect the mirror effect.
Second, mirror ink printing techniques:
1, first of all should understand the mirror ink thin like water, printing skills is the key, when the printing speed is slow, on the one hand, thin mirror ink like water will leak down the screen, on the other hand, the mirror ink is easy to absorb the moisture in the air, after printing The resulting mirror effect is not good. For this reason, when printing, the mirror ink must be continuously and quickly printed after being poured on the screen, so that the printing can be smoothly performed. Even if the inspection of the workpiece at the printing speed, the printing effect will be affected, for example, blocking. Network, ink printing can not go on the screen version slag group and so on.
2. The ambient temperature and humidity when printing mirror ink is very important. Because the ink is easy to dry on the screen, it cannot be screen printed in a large air circulation environment, otherwise it is very easy to block the network and become agar-like. At the same time, when the humidity is high, the mirror effect is poor, therefore, When screen printing, as much as possible to avoid air flow and humidity, screen printing environment should be enhanced de-wetting treatment. If the mirror ink is stored at 20°C and screen printed at 20°C, the printability will be better.
3, because the ink is thin as water, so you should choose a high mesh screen, not only that, the hardness of the squeegee should be harder, more than 80 °.
4. The mirror ink must be fully stirred before use so that the metal powder and the resin are fully mixed to ensure the appearance of the mirror effect. Otherwise, the mirror effect will be affected.
5, the screen tension is slightly lower, the net distance is also adjusted to some, and the scraping pressure of the scraper is appropriately reduced so that the mirror effect can be produced.
6, mechanical printing, the use of ink-jet knife can not use hard aluminum or stainless steel, but should use glial ink knife, to ensure that the screen printing mirror ink coating evenly, so that 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 and drying. Note that the heating temperature and drying time should be the same, otherwise the mirror performance and color saturation will also be There are differences.
Third, mirror ink recommended screen printing process parameters
1. Screen version uses 270~300 mesh/IN screen.
2. The photosensitive coating is made of a solvent-resistant type, such as British Coulter PLUS II emulsion or thin capillary film.
3, Squeegee (scraper) use 80 ~ 85 °.
4. Diluent: It is not required under normal conditions. If necessary, add T-1000 thinner. Stir before use.
5, silk screen environment: low temperature, low humidity, continuous screen printing, printing environment does not require air circulation.
6. Drying: 80°C 10-15 minutes, 60°C 15-20 minutes, 20-30 minutes at room temperature.
Fourth, the use of mirror ink precautions:
1. If you want to cover other inks on the mirror ink, you should choose a series of inks that do not erode the mirror ink. Otherwise, the mirror effect will be damaged.
2, printing mirror ink must be thin and uniform, at the same time, the mirror ink itself can not be overlapped printing, overlap printing will occur in the mirror ink in the metal powder peel. If the mirror ink is used on IMD, the mirror ink should be >0.5mm away from the cut edge to prevent the edge of the mirror ink from being damaged when the PC etc. are trimmed.
3, for PC, PMMA transparent formable sheet, often internal stress exists, when printing, pay attention to solvent erosion of these materials, not only loses the mirror effect, at the same time will make the material in the role of the solvent, the stress is released Cracking, therefore, before screen printing, must be tested before production or such sheet must be aging and anti-cracking treatment.
4. After printing mirror ink on inorganic glass, it cannot be dried by natural or low-temperature drying method. It must be dried above 100°C so that the mirror ink can have good adhesion on the glass, and it also shows a good mirror effect.
5, mirror ink due to thin water, usually without diluent. It is worth noting that when the viscosity becomes higher, it can be diluted with a special thinner and printed after the viscosity is restored. However, if the mirror oil is agglomerated, thinner cannot be used.
6, mirror ink should be stored in a sealed container, ambient temperature <25 °C, otherwise it will degenerate, or a long storage time will naturally degenerate, once the viscosity becomes higher, the ink becomes hard, discolored, that can not be used.
Five, mirror ink printing film property test results:
Test Item Result Test Condition Mirror Silver No. 1 Mirror Silver No. 1 Adhesion 100/100 After making a 1 mm pitch cross cut on the ink film, make a peel test with the adhesive paper. Flexibility 4MM diameter, 180 degree bending. Good secondary workability. Cutting edge film status check. Good rub resistance wipe rubber wipe (weight increase 500G, 50 wipe). Good water resistance in deionized water for 24 hours. Good moisture resistance temperature 60°C, humidity 95% in a week. 10 to 15 times resistance to alcohol, 1 to 5 grams of cotton stained with cotton wire, 15 times of acid resistance, 20 minutes of wiping, 20 minutes of 5% sulfuric acid solution on the printed surface, observation of the time of change, alkali resistance, 3 hours, 5 hours, 5% NOH The solution was dropped on the printing surface, and the time when the change was observed was 1000 hours of weatherability and was placed in an artificial weathering tester for 1,000 hours.
Test Conditions:
Printed material: transparent plexiglass sheet, bending, PET material during secondary processing test
Printing Screen: 270 mesh polyester screen
Drying conditions: heat drying at 60°C for 3 minutes.
First, the characteristics of mirror ink:
1. Mirror ink is made of special metal powder and resin as the basic material. After silk screen printing, it can achieve metallic mirror effect. Due to the need to maintain the maximum fluidity of the ink, the ink adds a large amount of special solvents, so the viscosity of the mirror ink is very low, as low as water, so the silk screen is more difficult, requiring high-tech printing level printing, otherwise, (1) When there is no printing, the mirror ink has leaked through the screen and is contaminated with the substrate. (2) In the printing process, the mirror ink is extremely easy to dry, in addition to easy blocking the network, but also make the dry mirror ink accumulated on the Internet, as a "silver slag" and reduce the mirror effect of the print.
2. The mirror ink uses the smoothness of the surface of the substrate material, so that the metal powder pigment in the printed ink is arranged in parallel on the surface of the light-printed substrate to obtain a mirror surface effect. Since the mirror ink has such a property, (1) a material having poor surface smoothness on a transparent substrate (transparent sheet) cannot obtain a mirror surface effect. (2) If the transparent substrate material is not resistant to the solvent in the mirror ink, good mirror effect will not be obtained. (3) After mirror ink printing, the mirror effect is related to the drying method. (4) Screen printing operation skills will affect the mirror effect.
Second, mirror ink printing techniques:
1, first of all should understand the mirror ink thin like water, printing skills is the key, when the printing speed is slow, on the one hand, thin mirror ink like water will leak down the screen, on the other hand, the mirror ink is easy to absorb the moisture in the air, after printing The resulting mirror effect is not good. For this reason, when printing, the mirror ink must be continuously and quickly printed after being poured on the screen, so that the printing can be smoothly performed. Even if the inspection of the workpiece at the printing speed, the printing effect will be affected, for example, blocking. Network, ink printing can not go on the screen version slag group and so on.
2. The ambient temperature and humidity when printing mirror ink is very important. Because the ink is easy to dry on the screen, it cannot be screen printed in a large air circulation environment, otherwise it is very easy to block the network and become agar-like. At the same time, when the humidity is high, the mirror effect is poor, therefore, When screen printing, as much as possible to avoid air flow and humidity, screen printing environment should be enhanced de-wetting treatment. If the mirror ink is stored at 20°C and screen printed at 20°C, the printability will be better.
3, because the ink is thin as water, so you should choose a high mesh screen, not only that, the hardness of the squeegee should be harder, more than 80 °.
4. The mirror ink must be fully stirred before use so that the metal powder and the resin are fully mixed to ensure the appearance of the mirror effect. Otherwise, the mirror effect will be affected.
5, the screen tension is slightly lower, the net distance is also adjusted to some, and the scraping pressure of the scraper is appropriately reduced so that the mirror effect can be produced.
6, mechanical printing, the use of ink-jet knife can not use hard aluminum or stainless steel, but should use glial ink knife, to ensure that the screen printing mirror ink coating evenly, so that 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 and drying. Note that the heating temperature and drying time should be the same, otherwise the mirror performance and color saturation will also be There are differences.
Third, mirror ink recommended screen printing process parameters
1. Screen version uses 270~300 mesh/IN screen.
2. The photosensitive coating is made of a solvent-resistant type, such as British Coulter PLUS II emulsion or thin capillary film.
3, Squeegee (scraper) use 80 ~ 85 °.
4. Diluent: It is not required under normal conditions. If necessary, add T-1000 thinner. Stir before use.
5, silk screen environment: low temperature, low humidity, continuous screen printing, printing environment does not require air circulation.
6. Drying: 80°C 10-15 minutes, 60°C 15-20 minutes, 20-30 minutes at room temperature.
Fourth, the use of mirror ink precautions:
1. If you want to cover other inks on the mirror ink, you should choose a series of inks that do not erode the mirror ink. Otherwise, the mirror effect will be damaged.
2, printing mirror ink must be thin and uniform, at the same time, the mirror ink itself can not be overlapped printing, overlap printing will occur in the mirror ink in the metal powder peel. If the mirror ink is used on IMD, the mirror ink should be >0.5mm away from the cut edge to prevent the edge of the mirror ink from being damaged when the PC etc. are trimmed.
3, for PC, PMMA transparent formable sheet, often internal stress exists, when printing, pay attention to solvent erosion of these materials, not only loses the mirror effect, at the same time will make the material in the role of the solvent, the stress is released Cracking, therefore, before screen printing, must be tested before production or such sheet must be aging and anti-cracking treatment.
4. After printing mirror ink on inorganic glass, it cannot be dried by natural or low-temperature drying method. It must be dried above 100°C so that the mirror ink can have good adhesion on the glass, and it also shows a good mirror effect.
5, mirror ink due to thin water, usually without diluent. It is worth noting that when the viscosity becomes higher, it can be diluted with a special thinner and printed after the viscosity is restored. However, if the mirror oil is agglomerated, thinner cannot be used.
6, mirror ink should be stored in a sealed container, ambient temperature <25 °C, otherwise it will degenerate, or a long storage time will naturally degenerate, once the viscosity becomes higher, the ink becomes hard, discolored, that can not be used.
Five, mirror ink printing film property test results:
Test Item Result Test Condition Mirror Silver No. 1 Mirror Silver No. 1 Adhesion 100/100 After making a 1 mm pitch cross cut on the ink film, make a peel test with the adhesive paper. Flexibility 4MM diameter, 180 degree bending. Good secondary workability. Cutting edge film status check. Good rub resistance wipe rubber wipe (weight increase 500G, 50 wipe). Good water resistance in deionized water for 24 hours. Good moisture resistance temperature 60°C, humidity 95% in a week. 10 to 15 times resistance to alcohol, 1 to 5 grams of cotton stained with cotton wire, 15 times of acid resistance, 20 minutes of wiping, 20 minutes of 5% sulfuric acid solution on the printed surface, observation of the time of change, alkali resistance, 3 hours, 5 hours, 5% NOH The solution was dropped on the printing surface, and the time when the change was observed was 1000 hours of weatherability and was placed in an artificial weathering tester for 1,000 hours.
Test Conditions:
Printed material: transparent plexiglass sheet, bending, PET material during secondary processing test
Printing Screen: 270 mesh polyester screen
Drying conditions: heat drying at 60°C for 3 minutes.
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