Current waterless offset inks are generally classified into two types of common inks and environmentally friendly inks.
Ordinary type waterless offset printing ink
The composition of the waterless offset ink is similar to that of a general offset ink. It is composed of a pigment, a resin binder, a solvent and a diluent, a Qi material, and an auxiliary agent.
1, Pigment
Waterless offset inks use pigments similar to normal offset inks except for carbon black pigments. Both organic pigments and yellow pigments have benzidine yellow (PY-12, PY-13, PY-14, PY-83, etc.). The red pigments are Lithol Red (PR-49: 1), 6B Magenta (PR57: 1), Golden Red C (PR-53: 1), 2B Permanent Red ((PR-48: 1) Blue Pigment For the blue (PB-15: 1), the green color is for the enamel, etc. For the pigment, it accounts for 15% to 25% of the total amount of ink.
2, resin connection material
The main resin used is similar to ordinary offset printing inks in major categories. The commonly used resins for waterless offset printing inks are rosin-modified phenolic resins, colloidal rosin-modified phenolic resins, and vegetable oil-modified ingestion resins such as linseed oil. However, due to the absence of evaporation of the fountain solution during waterless offset printing, the temperature sensitivity of the printing process is relatively high (this has been improved by mechanical devices) and thus has a special rheology for the resins that make up the ink. Performance requirements. In particular, the elastic effect on the drilling of the resin binder should be more noticeable. Generally, the elasticity of the drill is higher than that of ordinary offset inks, but the properties inside are slightly softer. The two are contradictory, but trying to find a suitable balance is the focus of ink formulations. In addition, the resin binder must have a suitable high cohesion material so that the ink can be completely and cleanly removed and transferred from the plate and the blanket.
The elasticity of the resin component and the size of its molecular weight crosslinks and the degree of branching has a more complicated relationship. Generally, a resin with a molecular weight of 210,000 to 400,000 can be used. The higher the molecular weight, the greater the degree of branching and the degree of textual association, Higher elasticity is achieved, but the solubility in vegetable oils and mineral oils is reduced. Therefore, the degree of resin absorption in the solvent should also be very careful.
The commonly used rosin modified phenolic resins used are bisphenol A, tert-butyl phenol, octyl phenol, nonyl phenol, dodecyl phenol, etc., and also use maleic acid modified rosin vinegar resin, in recent years, the United States Sun Chemical Co. and Gonglin Ink Co., Ltd. have successfully developed water-washable water-free offset inks that have entered industrial trials and trials. They have not penetrated the types of resins they use, but they are based on the principle of water-washable inks. It is speculated that the saponification of the ink can be washed off from the printing plate or printing machine. Of course, the introduction of this ingredient can make it unnecessary for the printing plant to use an organic solvent-based cleaning agent, but the alkali-resistant grade of the printing product must be reduced.
Ultraviolet (UV) and electron beam (EB) cured waterless offset oils are also under development. Cyclic acrylic vinegar, poly acrylamide vinegar, and polyazo acid acrylate can all be used as the main polymer of the binder.
3, solvents and thinners
In the printing process of waterless offset inks, the clear and complete stripping of ink from the image portion of the plate is one of the key factors for obtaining high quality prints. Over the years, the industry has gradually reached a consensus on the stripping mechanism. The theory of the “interface diffusion boundary layer†has been accepted by many researchers. The theory is that the solvent in the ink diffuses into the layout to form a thin liquid film layer so that the adsorption force of the rubber to the ink is much smaller than the cohesion force of the ink. This is advantageous for the ink layer to completely peel the printing plate, and then transfer to Blanket and paper. According to this theory, the choice of solvent in the ink appears to be very important, and it will contain multiple components (including additives). Earlier patents have reported this, such as the addition of liquid organic polysilazane in the ink solvent. In addition, some patents reported that the addition of non-ionic surfactants with H LB values ​​of 11-15 (such as ethers of polyoxyethylene or propanol, diethyleneglycol, acetic acid, etc.) would be very effective. The study also suggested that the use of vegetable oil derivatives such as rapeseed oil vinegar, oleic acid vinegar, etc. as a co-solvent, can make the ink drillability decline. Drilling value and elasticity value increase.
In addition to these functional solvents, mineral oils commonly used in offset printing inks and vegetable oils such as soybean oil and linseed oil are still important diluents.
4, slope and additives
The types of grave materials are similar to those of conventional offset inks. Calcium carbonate, calcium antimony white, and barium sulfate are still selected. Auxiliaries include wax wear resistance auxiliaries in the amount of 0,5% to 2,0"/Q naphthenic acid drill, manganese naphthenate and other desiccants (if needed in the formulation), the dosage is 1% to 3% Other additives with special functions.
Offset offset printing is a more complex printing method to eliminate fountain solution, improve print quality, increase production efficiency, and is more environmentally friendly, but the development of a special waterless offset ink to match the surface characteristics of the new plate to achieve a smooth ink There are still a lot of ink formulation work to be done to transfer, strip and transfer, and we need to continue to develop this new area that is gradually developing.
Environmental waterless offset printing ink
1, waterless offset printing ink tray development status
Compared with the first and second generations, the third-generation waterless offset printing has been used with low-quality waterless offset printing inks. In addition, the printed matter is no longer a thick ink film printing but a thin film of the same county as ordinary offset printing. The nature of other printing operations and stackability are the same as ordinary offset printing tombs. The improvements in sheet-fed, web presses in terms of lift-off speed and automation are endless, but the impact of print speed on printability far exceeds the expectations of the press designer, especially for ink transfer. Sex has a significant effect.
1Dry-O-Color Artis Sheet-fed Offset Printing Ink: Five-year-old "Dry-O-Color Artis" improved the transferability of the ink on the basis of the grave and anti-dirty properties of the product. , County, solid powder and post-processing suitability, etc., more adapted to the requirements of high-speed, multi-color sheetfed waterless offset press.
a, design ideas. After achieving the low drillability and low drilling rate required for high-speed printing, special additives must be used to further control anti-dirt. To maintain the drillability and degree of drilling, only the flowability of the ink can be further improved to increase the ink. The transferability. The specific approach is: To improve the dispersion of pigments. Use high-dissolving resin binders: To maintain dirt resistance. Use non-aromatic hydrocarbon solvents that allow fast diffusion of the printing plate oleophilic resin and the non-image part of the silicon layer, and develop new binders.
b, ink characteristics. The ink flowability is improved by about 15% and the ink transferability is improved by about 10% under almost the same conditions as the ink drillability and the degree of drilling.
c Market evaluation. Good gloss, fast solid powder: close to the quality of water offset: with the printability comparable to ordinary offset ink; ink hiding power has also improved, a small number of users put forward: the ink's twist-print performance is reduced by about 5%; color reproduction Sex is not exactly the same as printing with water; the density in the field is slightly inferior to the offset with water.
2 Thermoset type waterless offset printing inks for high-speed web offset presses: Web offset printing Compared with single-sheet printing, the printing speed is increased by about 2 times, and the flowability of the ink is required to be higher. Drilling requirements are slightly lower. Adopted with. The same resin design method of ry-O-ColorARis is also suitable for rotary waterless offset inks, which can replace the fluidity of the ink on the premise that the offset does not reduce the dirtiness of the JEc T, so that the ink can be well printed at high speed. Metastasis,
2, for waterless offset oil and research
Waterless offset printing plates are composed of an oleophilic resin layer and an oil repellent silicone layer. The most important properties for waterless offset inks are offset resistance, ink transferability and ink/ink resistance. Waterless offset printing ink development points:
1 to low-degree, high-liquidity development due to the improvement of matt coated paper, recycled paper, and the increase in the amount of paper in order to increase production efficiency, the continuous increase in printing speed is the result of paper lapping and printing plate pile phenomenon occur. Waterless offset printing Because no fountain solution is used, the higher viscosity of the ink on the paper surface is more prone to bristling and heap failure than water offset printing. Therefore, the low degree of ink and high fluidity of the ink is the key to ink technology innovation. .
The use of new, high-solubility, high-solubility resins can be effective in obtaining low-boiling, fluid-free inks, allowing low-rigidity resin cross-linking without compromising fluid flow. In the process of the resin-linked-texturing process, a network structure is formed between the macromolecules, and the internal cohesive force is increased, resulting in a large viscosity, such as an aluminum chelate type gelling agent, which may cause the ink to lose its fluidity. Thus, a heat-polymerized resin composed of rosin-modified phenolic resin and molecular chain lengths was proposed to make the resin quantified and plastic, thereby obtaining a low-degree-of-bility resin binder.
2 improve anti-dirt: anti-compacting with cT said that with the drilling quality and fluidity of the ink and the drilling quality is proportional to, and fluidity is inversely proportional, so with low drilling, low drilling, The ink technology with good fluidity (off-speed printing) design high cT ink is a bit difficult. Waterless offset printing should also be resistant to scumming at the same time as achieving low drilling. Therefore, the key issue in formula design of waterless offset printing ink is how to suppress the scumming of the printing plate. Generally speaking. There is a close relationship between anti-dirt properties and the degree of ink drilling, the solvent used and the density of the printing field, the structure of the printing press, and the printing speed.
3 Improve the Insulation: Soybean oil ink is an environmentally friendly ink that replaces organic solvent inks. Compared with high-cured oil or waterless offset inks, the curing speed is slower, but from the practical results, the ink transferability is good. Part of the powder is good, bright tone part of the outlet evenly colored. Ordinary offset inks reach the paper quickly due to solvent penetration. In the part near the paper surface, the dish will break off and the soy ink will penetrate slowly. The break-off surface of the ink is closer to the side of the blanket, which is equivalent to the transfer of a thicker film to the surface of the paper, so the oil The amount of dish transfer increased,
4 Improve ink transfer: There is a certain relationship between ink characteristics and color development. That is, the higher the ink drilling property and the higher the degree of color development, the lower the color development property; the smaller the fluidity is, the lower the color developability is. In order to obtain high color developability, it is necessary to improve the transferability of the ink, and thus it is required that the ink must have low drillability, low degree of bore, and high flowability.
It is difficult to balance both anti-dirt and ink transfer properties, and how to balance it is the key to waterless offset ink design.
Ordinary type waterless offset printing ink
The composition of the waterless offset ink is similar to that of a general offset ink. It is composed of a pigment, a resin binder, a solvent and a diluent, a Qi material, and an auxiliary agent.
1, Pigment
Waterless offset inks use pigments similar to normal offset inks except for carbon black pigments. Both organic pigments and yellow pigments have benzidine yellow (PY-12, PY-13, PY-14, PY-83, etc.). The red pigments are Lithol Red (PR-49: 1), 6B Magenta (PR57: 1), Golden Red C (PR-53: 1), 2B Permanent Red ((PR-48: 1) Blue Pigment For the blue (PB-15: 1), the green color is for the enamel, etc. For the pigment, it accounts for 15% to 25% of the total amount of ink.
2, resin connection material
The main resin used is similar to ordinary offset printing inks in major categories. The commonly used resins for waterless offset printing inks are rosin-modified phenolic resins, colloidal rosin-modified phenolic resins, and vegetable oil-modified ingestion resins such as linseed oil. However, due to the absence of evaporation of the fountain solution during waterless offset printing, the temperature sensitivity of the printing process is relatively high (this has been improved by mechanical devices) and thus has a special rheology for the resins that make up the ink. Performance requirements. In particular, the elastic effect on the drilling of the resin binder should be more noticeable. Generally, the elasticity of the drill is higher than that of ordinary offset inks, but the properties inside are slightly softer. The two are contradictory, but trying to find a suitable balance is the focus of ink formulations. In addition, the resin binder must have a suitable high cohesion material so that the ink can be completely and cleanly removed and transferred from the plate and the blanket.
The elasticity of the resin component and the size of its molecular weight crosslinks and the degree of branching has a more complicated relationship. Generally, a resin with a molecular weight of 210,000 to 400,000 can be used. The higher the molecular weight, the greater the degree of branching and the degree of textual association, Higher elasticity is achieved, but the solubility in vegetable oils and mineral oils is reduced. Therefore, the degree of resin absorption in the solvent should also be very careful.
The commonly used rosin modified phenolic resins used are bisphenol A, tert-butyl phenol, octyl phenol, nonyl phenol, dodecyl phenol, etc., and also use maleic acid modified rosin vinegar resin, in recent years, the United States Sun Chemical Co. and Gonglin Ink Co., Ltd. have successfully developed water-washable water-free offset inks that have entered industrial trials and trials. They have not penetrated the types of resins they use, but they are based on the principle of water-washable inks. It is speculated that the saponification of the ink can be washed off from the printing plate or printing machine. Of course, the introduction of this ingredient can make it unnecessary for the printing plant to use an organic solvent-based cleaning agent, but the alkali-resistant grade of the printing product must be reduced.
Ultraviolet (UV) and electron beam (EB) cured waterless offset oils are also under development. Cyclic acrylic vinegar, poly acrylamide vinegar, and polyazo acid acrylate can all be used as the main polymer of the binder.
3, solvents and thinners
In the printing process of waterless offset inks, the clear and complete stripping of ink from the image portion of the plate is one of the key factors for obtaining high quality prints. Over the years, the industry has gradually reached a consensus on the stripping mechanism. The theory of the “interface diffusion boundary layer†has been accepted by many researchers. The theory is that the solvent in the ink diffuses into the layout to form a thin liquid film layer so that the adsorption force of the rubber to the ink is much smaller than the cohesion force of the ink. This is advantageous for the ink layer to completely peel the printing plate, and then transfer to Blanket and paper. According to this theory, the choice of solvent in the ink appears to be very important, and it will contain multiple components (including additives). Earlier patents have reported this, such as the addition of liquid organic polysilazane in the ink solvent. In addition, some patents reported that the addition of non-ionic surfactants with H LB values ​​of 11-15 (such as ethers of polyoxyethylene or propanol, diethyleneglycol, acetic acid, etc.) would be very effective. The study also suggested that the use of vegetable oil derivatives such as rapeseed oil vinegar, oleic acid vinegar, etc. as a co-solvent, can make the ink drillability decline. Drilling value and elasticity value increase.
In addition to these functional solvents, mineral oils commonly used in offset printing inks and vegetable oils such as soybean oil and linseed oil are still important diluents.
4, slope and additives
The types of grave materials are similar to those of conventional offset inks. Calcium carbonate, calcium antimony white, and barium sulfate are still selected. Auxiliaries include wax wear resistance auxiliaries in the amount of 0,5% to 2,0"/Q naphthenic acid drill, manganese naphthenate and other desiccants (if needed in the formulation), the dosage is 1% to 3% Other additives with special functions.
Offset offset printing is a more complex printing method to eliminate fountain solution, improve print quality, increase production efficiency, and is more environmentally friendly, but the development of a special waterless offset ink to match the surface characteristics of the new plate to achieve a smooth ink There are still a lot of ink formulation work to be done to transfer, strip and transfer, and we need to continue to develop this new area that is gradually developing.
Environmental waterless offset printing ink
1, waterless offset printing ink tray development status
Compared with the first and second generations, the third-generation waterless offset printing has been used with low-quality waterless offset printing inks. In addition, the printed matter is no longer a thick ink film printing but a thin film of the same county as ordinary offset printing. The nature of other printing operations and stackability are the same as ordinary offset printing tombs. The improvements in sheet-fed, web presses in terms of lift-off speed and automation are endless, but the impact of print speed on printability far exceeds the expectations of the press designer, especially for ink transfer. Sex has a significant effect.
1Dry-O-Color Artis Sheet-fed Offset Printing Ink: Five-year-old "Dry-O-Color Artis" improved the transferability of the ink on the basis of the grave and anti-dirty properties of the product. , County, solid powder and post-processing suitability, etc., more adapted to the requirements of high-speed, multi-color sheetfed waterless offset press.
a, design ideas. After achieving the low drillability and low drilling rate required for high-speed printing, special additives must be used to further control anti-dirt. To maintain the drillability and degree of drilling, only the flowability of the ink can be further improved to increase the ink. The transferability. The specific approach is: To improve the dispersion of pigments. Use high-dissolving resin binders: To maintain dirt resistance. Use non-aromatic hydrocarbon solvents that allow fast diffusion of the printing plate oleophilic resin and the non-image part of the silicon layer, and develop new binders.
b, ink characteristics. The ink flowability is improved by about 15% and the ink transferability is improved by about 10% under almost the same conditions as the ink drillability and the degree of drilling.
c Market evaluation. Good gloss, fast solid powder: close to the quality of water offset: with the printability comparable to ordinary offset ink; ink hiding power has also improved, a small number of users put forward: the ink's twist-print performance is reduced by about 5%; color reproduction Sex is not exactly the same as printing with water; the density in the field is slightly inferior to the offset with water.
2 Thermoset type waterless offset printing inks for high-speed web offset presses: Web offset printing Compared with single-sheet printing, the printing speed is increased by about 2 times, and the flowability of the ink is required to be higher. Drilling requirements are slightly lower. Adopted with. The same resin design method of ry-O-ColorARis is also suitable for rotary waterless offset inks, which can replace the fluidity of the ink on the premise that the offset does not reduce the dirtiness of the JEc T, so that the ink can be well printed at high speed. Metastasis,
2, for waterless offset oil and research
Waterless offset printing plates are composed of an oleophilic resin layer and an oil repellent silicone layer. The most important properties for waterless offset inks are offset resistance, ink transferability and ink/ink resistance. Waterless offset printing ink development points:
1 to low-degree, high-liquidity development due to the improvement of matt coated paper, recycled paper, and the increase in the amount of paper in order to increase production efficiency, the continuous increase in printing speed is the result of paper lapping and printing plate pile phenomenon occur. Waterless offset printing Because no fountain solution is used, the higher viscosity of the ink on the paper surface is more prone to bristling and heap failure than water offset printing. Therefore, the low degree of ink and high fluidity of the ink is the key to ink technology innovation. .
The use of new, high-solubility, high-solubility resins can be effective in obtaining low-boiling, fluid-free inks, allowing low-rigidity resin cross-linking without compromising fluid flow. In the process of the resin-linked-texturing process, a network structure is formed between the macromolecules, and the internal cohesive force is increased, resulting in a large viscosity, such as an aluminum chelate type gelling agent, which may cause the ink to lose its fluidity. Thus, a heat-polymerized resin composed of rosin-modified phenolic resin and molecular chain lengths was proposed to make the resin quantified and plastic, thereby obtaining a low-degree-of-bility resin binder.
2 improve anti-dirt: anti-compacting with cT said that with the drilling quality and fluidity of the ink and the drilling quality is proportional to, and fluidity is inversely proportional, so with low drilling, low drilling, The ink technology with good fluidity (off-speed printing) design high cT ink is a bit difficult. Waterless offset printing should also be resistant to scumming at the same time as achieving low drilling. Therefore, the key issue in formula design of waterless offset printing ink is how to suppress the scumming of the printing plate. Generally speaking. There is a close relationship between anti-dirt properties and the degree of ink drilling, the solvent used and the density of the printing field, the structure of the printing press, and the printing speed.
3 Improve the Insulation: Soybean oil ink is an environmentally friendly ink that replaces organic solvent inks. Compared with high-cured oil or waterless offset inks, the curing speed is slower, but from the practical results, the ink transferability is good. Part of the powder is good, bright tone part of the outlet evenly colored. Ordinary offset inks reach the paper quickly due to solvent penetration. In the part near the paper surface, the dish will break off and the soy ink will penetrate slowly. The break-off surface of the ink is closer to the side of the blanket, which is equivalent to the transfer of a thicker film to the surface of the paper, so the oil The amount of dish transfer increased,
4 Improve ink transfer: There is a certain relationship between ink characteristics and color development. That is, the higher the ink drilling property and the higher the degree of color development, the lower the color development property; the smaller the fluidity is, the lower the color developability is. In order to obtain high color developability, it is necessary to improve the transferability of the ink, and thus it is required that the ink must have low drillability, low degree of bore, and high flowability.
It is difficult to balance both anti-dirt and ink transfer properties, and how to balance it is the key to waterless offset ink design.
Reprinted from: Printed Today
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