After the print head has left the pad, the solvent in the ink of the pad ink evaporates, which makes the ink on the pad surface more viscous. The depth of the gravure image etched in many pad printings is 25 μm or less.
The squeegee is used to scrape off the ink on the printing plate protrusion section (vacancy department), allowing only the ink to enter the etched recessed image area.
Printing ink steps and note points
An obvious feature inherent in pad printing inks is that the ink's ability to become sticky is very prominent, and the pigment particle size and the proportion of pigments are very different from other types of inks.
From the above six steps, it can be seen that since the printing ink has a very high viscosity change requirement, the solvent used in the printing ink can be evaporated at a much faster rate than the solvent used in ordinary screen printing inks. Get the ideal printing effect. In addition, because the thickness of the ink film for pad printing is about 20% of the screen printing, the pigment concentration in the pad ink must be sufficiently high in order to obtain a sufficient hiding power.
The viscosity of the ink at this time must be sufficiently low so that the ink can spread flatly on the surface of the transfer printing plate and can enter the recessed etching image area. Because of the high volatilization rate of the solvent, this will cause the ink on the surface of the image depression to be more sticky than the ink below.
Ink is added to the etch pit area of ​​the printing plate, which marks the beginning of the printing cycle.
The print head is removed from the surface of the substrate and restored. In this case, the pigment particles contained in the pad printing ink must be smaller than most of the screen printing inks. If the change factors involved in the six steps are properly controlled, the print head will leave the substrate cleanly, at which point a complete pad printing cycle is completed and the pad head is ready for the next pad printing cycle. In fact, a well-designed print head does not form a 0° contact with the substrate. This prevents air from remaining between the print head and the substrate. If air remains in the image area, image transfer will be incomplete. . At this point, the print head is designed to be curved and flexible, despite the fact that the print head may exert very great pressure, so that the image can be brought into contact with the substrate in a curved manner rather than a flat manner.
The print head applies pressure evenly to the moving intaglio, while squeezing out the air on the intaglio. Some pad printers use open inked holes, while others use blocked ink holes (such ink holes prevent solvent from escaping in the ink holes). In this case, since the viscosity of the surface ink in the depressed region of the image is large, the ink can be moved away from the depressed region and adhered to the print head.
When the surface of the print head comes into contact with the surface of the substrate, the ink is removed from the print head to adhere to the surface of the substrate because the viscosity of the ink on the surface of the print head is relatively large.
The squeegee is used to scrape off the ink on the printing plate protrusion section (vacancy department), allowing only the ink to enter the etched recessed image area.
Printing ink steps and note points
An obvious feature inherent in pad printing inks is that the ink's ability to become sticky is very prominent, and the pigment particle size and the proportion of pigments are very different from other types of inks.
From the above six steps, it can be seen that since the printing ink has a very high viscosity change requirement, the solvent used in the printing ink can be evaporated at a much faster rate than the solvent used in ordinary screen printing inks. Get the ideal printing effect. In addition, because the thickness of the ink film for pad printing is about 20% of the screen printing, the pigment concentration in the pad ink must be sufficiently high in order to obtain a sufficient hiding power.
The viscosity of the ink at this time must be sufficiently low so that the ink can spread flatly on the surface of the transfer printing plate and can enter the recessed etching image area. Because of the high volatilization rate of the solvent, this will cause the ink on the surface of the image depression to be more sticky than the ink below.
Ink is added to the etch pit area of ​​the printing plate, which marks the beginning of the printing cycle.
The print head is removed from the surface of the substrate and restored. In this case, the pigment particles contained in the pad printing ink must be smaller than most of the screen printing inks. If the change factors involved in the six steps are properly controlled, the print head will leave the substrate cleanly, at which point a complete pad printing cycle is completed and the pad head is ready for the next pad printing cycle. In fact, a well-designed print head does not form a 0° contact with the substrate. This prevents air from remaining between the print head and the substrate. If air remains in the image area, image transfer will be incomplete. . At this point, the print head is designed to be curved and flexible, despite the fact that the print head may exert very great pressure, so that the image can be brought into contact with the substrate in a curved manner rather than a flat manner.
The print head applies pressure evenly to the moving intaglio, while squeezing out the air on the intaglio. Some pad printers use open inked holes, while others use blocked ink holes (such ink holes prevent solvent from escaping in the ink holes). In this case, since the viscosity of the surface ink in the depressed region of the image is large, the ink can be moved away from the depressed region and adhered to the print head.
When the surface of the print head comes into contact with the surface of the substrate, the ink is removed from the print head to adhere to the surface of the substrate because the viscosity of the ink on the surface of the print head is relatively large.
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