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Visual effect
In the relationship between paper and printing effects, we should also pay attention to the paper's ink and coloring properties of the ink film. Although, the color of the paper has a certain influence on the effect of the printed sheet. Because of the difference in printing, the same ink produces a very different visual effect and can even change the color tone. The same kind of job is printed on different types of paper, and the quality of the print is different. It often makes people feel disappointed.
chemical composition
The chemical composition of paper has a great influence on printability. Excessive acid content in the paper slows down the drying of the ink. This is more evident in areas with high relative humidity and high moisture content. In general, non-coated papers with a pH of 5 or 5.5 (or slightly higher) and coated paper with a pH of 7-8.5 do not cause problems with ink drying unless the relative temperatures are high, such as In Southeast Asia, relative humidity is above 65%. According to the specific circumstances, heating and rapid drying can be used. Understand the paper's moisture accountant and keep it at the required level, which is a basic guarantee for producing high-quality prints. Paper fibers, like sponges, absorb or release water molecules according to the humidity of the printing environment. The state in which paper fibers neither absorb nor release water molecules is called equilibrium. Different grades of substrates have different balance points. For example, at the same humidity, the absolute humidity of bleached paperboard can reach 6%, and the absolute humidity of unbleached kraft paper can reach 7.5%. Dry webs tend to break on the press because many flexo printers pull the web over the printing unit. The normal humidity of the paper is 5-7%. High humidity can affect the paper's ink performance. When the humidity is too low, the ink layer cracks when the printed sheet is folded. Paper fibers absorb moisture from the air, the volume becomes larger, and internal pressure is generated. Release of internal pressure can cause warpage of the paper edge.
Printing ink
Water based inks, solvent inks and UV inks can be used in flexo printing. The quality of water-based inks has been greatly improved and harmless to the environment. Therefore, more emphasis has been placed on flexographic printing. Water-based inks today have almost as much print quality on paper as solvent inks. The water-based ink does not contain volatile organic solvents. It is proved to be a more suitable flexo ink by virtue of its abrasion resistance, printability, ink layer characteristics, and increased value of the outline points.
Printability of water-based inks
Applicable printing inks should be able to achieve the desired ink layer thickness, print clearly, without markings, do not make water, non-stick, do not paste version, non-graphic part is not sticky ink. Printing quality is the result of the combined effects of ink, paper, printing processes and printing equipment. In short, the ink consists essentially of two parts. The first part is a pigment that adheres to the surface of the paper to produce the desired visual effect. The other part is the binder, which allows the ink to flow and allows the pigment to adhere to the surface of the paper after drying. More than one type of pigment is often used when formulating inks, and the binder is often composed of several liquid materials. Be cautious when choosing ink ingredients, so that the formulated ink has the following characteristics:
1. The ink must contain enough pigment to print a dense, solid color.
2. The ink composition is dispersed evenly, and there is no unevenness of density when it is stored or used on the ink roller.
3. The printing should be cured and dried within the specified time, not sticky.
4. Have the desired printing fluidity.
5. Segmented ink performance is good.
6. Can be adhered to the designated surface after being wetted as required.
7. According to the need to produce a dark glossy effect or light effect, can be used for overprinting, can be glazing treatment.
8. The dried ink film is resistant to acids, alkalis, water, ultraviolet rays, abrasion, and not affected by alcohol and grease.
9. The odor after drying is minimal, especially when used in food packaging.
10. Does not contain harmful substances (such as toluene)
In the relationship between paper and printing effects, we should also pay attention to the paper's ink and coloring properties of the ink film. Although, the color of the paper has a certain influence on the effect of the printed sheet. Because of the difference in printing, the same ink produces a very different visual effect and can even change the color tone. The same kind of job is printed on different types of paper, and the quality of the print is different. It often makes people feel disappointed.
chemical composition
The chemical composition of paper has a great influence on printability. Excessive acid content in the paper slows down the drying of the ink. This is more evident in areas with high relative humidity and high moisture content. In general, non-coated papers with a pH of 5 or 5.5 (or slightly higher) and coated paper with a pH of 7-8.5 do not cause problems with ink drying unless the relative temperatures are high, such as In Southeast Asia, relative humidity is above 65%. According to the specific circumstances, heating and rapid drying can be used. Understand the paper's moisture accountant and keep it at the required level, which is a basic guarantee for producing high-quality prints. Paper fibers, like sponges, absorb or release water molecules according to the humidity of the printing environment. The state in which paper fibers neither absorb nor release water molecules is called equilibrium. Different grades of substrates have different balance points. For example, at the same humidity, the absolute humidity of bleached paperboard can reach 6%, and the absolute humidity of unbleached kraft paper can reach 7.5%. Dry webs tend to break on the press because many flexo printers pull the web over the printing unit. The normal humidity of the paper is 5-7%. High humidity can affect the paper's ink performance. When the humidity is too low, the ink layer cracks when the printed sheet is folded. Paper fibers absorb moisture from the air, the volume becomes larger, and internal pressure is generated. Release of internal pressure can cause warpage of the paper edge.
Printing ink
Water based inks, solvent inks and UV inks can be used in flexo printing. The quality of water-based inks has been greatly improved and harmless to the environment. Therefore, more emphasis has been placed on flexographic printing. Water-based inks today have almost as much print quality on paper as solvent inks. The water-based ink does not contain volatile organic solvents. It is proved to be a more suitable flexo ink by virtue of its abrasion resistance, printability, ink layer characteristics, and increased value of the outline points.
Printability of water-based inks
Applicable printing inks should be able to achieve the desired ink layer thickness, print clearly, without markings, do not make water, non-stick, do not paste version, non-graphic part is not sticky ink. Printing quality is the result of the combined effects of ink, paper, printing processes and printing equipment. In short, the ink consists essentially of two parts. The first part is a pigment that adheres to the surface of the paper to produce the desired visual effect. The other part is the binder, which allows the ink to flow and allows the pigment to adhere to the surface of the paper after drying. More than one type of pigment is often used when formulating inks, and the binder is often composed of several liquid materials. Be cautious when choosing ink ingredients, so that the formulated ink has the following characteristics:
1. The ink must contain enough pigment to print a dense, solid color.
2. The ink composition is dispersed evenly, and there is no unevenness of density when it is stored or used on the ink roller.
3. The printing should be cured and dried within the specified time, not sticky.
4. Have the desired printing fluidity.
5. Segmented ink performance is good.
6. Can be adhered to the designated surface after being wetted as required.
7. According to the need to produce a dark glossy effect or light effect, can be used for overprinting, can be glazing treatment.
8. The dried ink film is resistant to acids, alkalis, water, ultraviolet rays, abrasion, and not affected by alcohol and grease.
9. The odor after drying is minimal, especially when used in food packaging.
10. Does not contain harmful substances (such as toluene)
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