Ink film
The key to using a high-density ink is to keep the ink film as thin as possible while ensuring the ink film properties of the color intensity. This requires increasing the content of the pigment in the ink and the viscosity of the lowering binder. Another point is that the dispersion or wettability of the pigment is better. In most cases, when the pigment has the best wettability, the viscosity is the lowest, and the color depth and color intensity are the maximum.
High density inks can be printed with a fine profile roller and a squeegee to obtain a thin ink film while maintaining a high viscosity. The printed sheets are of good quality and low cost. The volume of the roller of the stand roller and the line number of the line play a very important role. In order to obtain the desired printing effect with a fine roller, the viscosity of the ink must be moderate. The more number of outline lines, the higher the viscosity should be. However, the viscosity must be stable, and if the viscosity is too low, it will cause the stencil phenomenon to occur. High viscosity is easy to stick. In order to obtain the best print quality, the viscosity of the ink should be carefully adjusted. Do not use random solvents or water to infiltrate the ink to change the viscosity of the ink. Care should be taken to measure the amount of the ink, and then see how effective it is.
Ink drying
The drying quality is related to the resin in the binder and the solvent that dissolves the resin. If polyamide inks with high solids content are used, the first step to improve printability is to check the solvent used to dissolve the resin and see if the solvent can make the binders have lower viscosity and lower surface tension. With extremely strong compatibility, does the last-used solvent evaporate from the ink?
In order to print clean, uncontaminated sheets, inks with good dissolving and re-dissolving properties should be used, so that the dried ink on the roller and the plate will be dissolved by the newly used ink, and the ink will not be deposited on it. Plate or dry solid on the roller. The water-based ink printed on the paper is dried and solidified by the ink absorption properties of the paper and the solvent, water evaporation. If the drying speed is too fast, the ink will quickly solidify, and the outline points will be damaged or lost when printing the outline; when printing solid colors, the quality of the ink transfer may be adversely affected, resulting in uneven printing or the generation of small holes. The drying speed of the ink is too slow, and the growth of the outline is more significant. At the moment of imprinting, if the ink color of the first color sequence is strong, the ink film is thin, and the drying speed is fast, a good overprint effect will be obtained. In other words, there should be successively different drying speeds. The ink that is used first has the fastest drying speed, and the ink that is used later has a slower drying speed, but it should not be too slow so as not to cause stickiness or bleeding.
Printing plate
When it comes to printing plates, the distinction between folding carton printing, label printing, flexible packaging printing, and corrugated paper direct printing must be understood. In these printing productions above, in order to further improve the printability of inks and substrates, relatively thin printing plates are often used. In flexographic printing, the printing pressure is always higher than the kiss-print printing pressure. Therefore, the printing plate will inevitably inevitably occur ------- deformation, resulting in an increase of points, and may lead to the lake version. In order to increase the resolution of the printing plate, reduce the increase of the outline point and increase the printing speed, the thin printing plate is often installed on the elastic pad material. It should be remembered that the softer the printing plate, the higher the increase of the outline and the more important the paste version.
The higher the number of printing plate lines, the greater the increase of the outline points. In order to obtain repeatable good printing results, some media were selected as standard media to ensure that the printability of the paper was improved.
Print on coated paper
For flexible packaging printing on coated paper, a nyloflex FAH or FAR type II plate with a thickness of 1.14 mm is often used, and a foam-coated sleeve is provided, and an anvil roller and an ink hole are also provided. Squeegee. The elastic plate on the sleeve allows the actual site to be subjected to a greater printing pressure, eliminating the perforations, and on the other hand the half-tone area can be subjected to a smaller printing pressure, resulting in a clear circular outline. When the ink is set in place, the ink transfer amount of the roller can ensure that the solid part of the ink is full, as long as the FAH plate with a thickness of 1.14 mm is used (with a sleeve with a foam coating, the solid and outline patterns can be printed ) It is also easier to add a bar code to the actual or half-colored part of each plate. When printing on coated paper, the thickness of the plate is usually 1.14 mm. The hardness of FAH media is Shore A (grade A, different) 56-58, while the hardness of softer FARII media is Shore Hard 49-52. Both of the above plates can be used to print graphics on coated paper.
Print on non-coated paper
Do not configure the sleeve
The surface roughness of this substrate has a great influence on printing. When printing on rough paper, use a 2.25 mm thick plate. The FARII254 plate is to be mounted on PE or PU double-sided elastic mounting tape. These mounting tapes are hard and soft. The harder the mounting tape, the better the printing effect. When printing on uncoated paper, harder mounting tapes are generally used. Plates with a thickness of 2.54 mm were equipped with a PU or PE mounting tape with a thickness of 0.50 mm or 0.55 mm. The printing plate with a thickness of 2.84 mm has a high rate of increase in the outline, and its use is gradually decreasing.
Configuration sleeve
FA1.2, FARII, or FAH plates with a thickness of 1.70 mm can also be used when configuring sleeves. The configured sleeve should be a hard sleeve, and the following is a mounting tape with a thickness of 0.38 or 0.55 mm. The sleeve should be custom made according to the thickness of the mounting strip used. When printing on uncoated paper, it is best to use a relatively soft plate (such as nyloflex FARII or FA plates) because of the high hiding power of the soft plate and overprinting inks. On small rollers, FAII plates are less rigid because they are less rigid.
Print on corrugated cardboard
To significantly reduce the increase in outline printed on corrugated paper. The FAC394 plate was introduced with a thickness of 3.94 mm and was mounted on an inert R/back-type mat. FAC394 profiles are kraft boxboard printing plates. The relief height is typically 2-3 mm. Two different plates can be used depending on the weight of the board. The FAC394 type plate with a Shore hardness of 32-34 is normally used when printing on uncoated white paperboard and Kraft board B wave, which can eliminate the possible adverse effects due to surface roughness. However, when printing on white paperboard and kraft paperboard, Asian printers are more and more inclined to use harder plates (such as the FACII394S type plate with a Shore hardness of 40-42). It is said that this kind of plate outline has a smaller increase, the printing effect is clear, and it is easy to handle. To prevent crushing the corrugations, the printing pressure must be set carefully. When printed on coated and semi-coated white paperboards (European weight 180-220 g/m2), BASF nyloflex FAII type plates with a thickness of 2.84 mm or 2.54 mm are increasingly used today. material. This plate has a Shore hardness of 44-46, a minimal increase in outline, and a high print quality in halftone text. A 4.05 mm thick elastomeric mat was used for plate mounting. These plates are usually mounted on a 1mm thick tape and PET padding is used to achieve the best compressible state of the pad material. Then the PET pad material is fixed on the R/bak material. Then install it on the roller. This is a form of loading that is often used in Asian printing.
Source: Paper Arts
The key to using a high-density ink is to keep the ink film as thin as possible while ensuring the ink film properties of the color intensity. This requires increasing the content of the pigment in the ink and the viscosity of the lowering binder. Another point is that the dispersion or wettability of the pigment is better. In most cases, when the pigment has the best wettability, the viscosity is the lowest, and the color depth and color intensity are the maximum.
High density inks can be printed with a fine profile roller and a squeegee to obtain a thin ink film while maintaining a high viscosity. The printed sheets are of good quality and low cost. The volume of the roller of the stand roller and the line number of the line play a very important role. In order to obtain the desired printing effect with a fine roller, the viscosity of the ink must be moderate. The more number of outline lines, the higher the viscosity should be. However, the viscosity must be stable, and if the viscosity is too low, it will cause the stencil phenomenon to occur. High viscosity is easy to stick. In order to obtain the best print quality, the viscosity of the ink should be carefully adjusted. Do not use random solvents or water to infiltrate the ink to change the viscosity of the ink. Care should be taken to measure the amount of the ink, and then see how effective it is.
Ink drying
The drying quality is related to the resin in the binder and the solvent that dissolves the resin. If polyamide inks with high solids content are used, the first step to improve printability is to check the solvent used to dissolve the resin and see if the solvent can make the binders have lower viscosity and lower surface tension. With extremely strong compatibility, does the last-used solvent evaporate from the ink?
In order to print clean, uncontaminated sheets, inks with good dissolving and re-dissolving properties should be used, so that the dried ink on the roller and the plate will be dissolved by the newly used ink, and the ink will not be deposited on it. Plate or dry solid on the roller. The water-based ink printed on the paper is dried and solidified by the ink absorption properties of the paper and the solvent, water evaporation. If the drying speed is too fast, the ink will quickly solidify, and the outline points will be damaged or lost when printing the outline; when printing solid colors, the quality of the ink transfer may be adversely affected, resulting in uneven printing or the generation of small holes. The drying speed of the ink is too slow, and the growth of the outline is more significant. At the moment of imprinting, if the ink color of the first color sequence is strong, the ink film is thin, and the drying speed is fast, a good overprint effect will be obtained. In other words, there should be successively different drying speeds. The ink that is used first has the fastest drying speed, and the ink that is used later has a slower drying speed, but it should not be too slow so as not to cause stickiness or bleeding.
Printing plate
When it comes to printing plates, the distinction between folding carton printing, label printing, flexible packaging printing, and corrugated paper direct printing must be understood. In these printing productions above, in order to further improve the printability of inks and substrates, relatively thin printing plates are often used. In flexographic printing, the printing pressure is always higher than the kiss-print printing pressure. Therefore, the printing plate will inevitably inevitably occur ------- deformation, resulting in an increase of points, and may lead to the lake version. In order to increase the resolution of the printing plate, reduce the increase of the outline point and increase the printing speed, the thin printing plate is often installed on the elastic pad material. It should be remembered that the softer the printing plate, the higher the increase of the outline and the more important the paste version.
The higher the number of printing plate lines, the greater the increase of the outline points. In order to obtain repeatable good printing results, some media were selected as standard media to ensure that the printability of the paper was improved.
Print on coated paper
For flexible packaging printing on coated paper, a nyloflex FAH or FAR type II plate with a thickness of 1.14 mm is often used, and a foam-coated sleeve is provided, and an anvil roller and an ink hole are also provided. Squeegee. The elastic plate on the sleeve allows the actual site to be subjected to a greater printing pressure, eliminating the perforations, and on the other hand the half-tone area can be subjected to a smaller printing pressure, resulting in a clear circular outline. When the ink is set in place, the ink transfer amount of the roller can ensure that the solid part of the ink is full, as long as the FAH plate with a thickness of 1.14 mm is used (with a sleeve with a foam coating, the solid and outline patterns can be printed ) It is also easier to add a bar code to the actual or half-colored part of each plate. When printing on coated paper, the thickness of the plate is usually 1.14 mm. The hardness of FAH media is Shore A (grade A, different) 56-58, while the hardness of softer FARII media is Shore Hard 49-52. Both of the above plates can be used to print graphics on coated paper.
Print on non-coated paper
Do not configure the sleeve
The surface roughness of this substrate has a great influence on printing. When printing on rough paper, use a 2.25 mm thick plate. The FARII254 plate is to be mounted on PE or PU double-sided elastic mounting tape. These mounting tapes are hard and soft. The harder the mounting tape, the better the printing effect. When printing on uncoated paper, harder mounting tapes are generally used. Plates with a thickness of 2.54 mm were equipped with a PU or PE mounting tape with a thickness of 0.50 mm or 0.55 mm. The printing plate with a thickness of 2.84 mm has a high rate of increase in the outline, and its use is gradually decreasing.
Configuration sleeve
FA1.2, FARII, or FAH plates with a thickness of 1.70 mm can also be used when configuring sleeves. The configured sleeve should be a hard sleeve, and the following is a mounting tape with a thickness of 0.38 or 0.55 mm. The sleeve should be custom made according to the thickness of the mounting strip used. When printing on uncoated paper, it is best to use a relatively soft plate (such as nyloflex FARII or FA plates) because of the high hiding power of the soft plate and overprinting inks. On small rollers, FAII plates are less rigid because they are less rigid.
Print on corrugated cardboard
To significantly reduce the increase in outline printed on corrugated paper. The FAC394 plate was introduced with a thickness of 3.94 mm and was mounted on an inert R/back-type mat. FAC394 profiles are kraft boxboard printing plates. The relief height is typically 2-3 mm. Two different plates can be used depending on the weight of the board. The FAC394 type plate with a Shore hardness of 32-34 is normally used when printing on uncoated white paperboard and Kraft board B wave, which can eliminate the possible adverse effects due to surface roughness. However, when printing on white paperboard and kraft paperboard, Asian printers are more and more inclined to use harder plates (such as the FACII394S type plate with a Shore hardness of 40-42). It is said that this kind of plate outline has a smaller increase, the printing effect is clear, and it is easy to handle. To prevent crushing the corrugations, the printing pressure must be set carefully. When printed on coated and semi-coated white paperboards (European weight 180-220 g/m2), BASF nyloflex FAII type plates with a thickness of 2.84 mm or 2.54 mm are increasingly used today. material. This plate has a Shore hardness of 44-46, a minimal increase in outline, and a high print quality in halftone text. A 4.05 mm thick elastomeric mat was used for plate mounting. These plates are usually mounted on a 1mm thick tape and PET padding is used to achieve the best compressible state of the pad material. Then the PET pad material is fixed on the R/bak material. Then install it on the roller. This is a form of loading that is often used in Asian printing.
Source: Paper Arts
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