After the ink is transferred from the printing plate to the surface of the substrate under the pressure of the printing material, a part of the linking material in the ink penetrates, and at the same time, the solvent of the linking material begins to evaporate, and then the main part of the linking section generates the physics and chemistry. Reaction, so that the ink on the surface of the substrate gradually increase its adhesiveness and degree of curing, and finally formed an ink film resistant to mechanical friction. The speed of imprinting drying is related to the properties of the substrate, ambient temperature and humidity, raw material properties, and process operations. The drying speed of the print has a great influence on the print quality. Drying is too slow, light to make the back of the printed product dirty, heavy cause the paste and other defects; drying too fast, the heat released when the imprinted dry heat caused by discoloration or fading of the ink, the ink is prone to crystallization, the paper is easy to produce Pulling phenomenon. Therefore, to analyze the law of imprinting drying, control the speed of imprinting drying in production, and make imprinting dry at a proper time, in order to obtain high-quality prints with full ink, bright colors, rich gradations, and high gloss.
1. Reorganization of substrates
The effect of paper pH on blotting drying. The paper is preferably neutral, but most of the paper is weakly alkaline, and the acidic paper tends to have a great influence on the drying of the print. Once, our factory used 157g/m2 coated paper to print the outer packaging of a wire factory. After printing the first background, we waited for one day and did not see it. A manufacturer's coated paper was reprinted, the same ink and machine, and the paper blotting afterwards was very suitable for drying. Afterwards, we negotiated with the coated paper mill. After the analysis, it was the acidity of the coated paper, which inhibited the drying of the ink and responded. Return payment processing. When the paper is acidic, it can make the ink layer dry for a few days.
The fiber structure of the paper affects the drying of the print. Rough surface, loose structure, high permeability, less sizing paper, imprinted and dried quickly. On the contrary, the surface smoothness is high, the fiber is tough and dense, and the paper with much coating and rubber material is applied, and the imprinting is slow drying.
The moisture content of the paper itself also affects blotting drying. Papers with high water content have reduced strength, the paper becomes fluffy, the fibers are in a relaxed state, and some capillaries are blocked by water molecules, so the intermolecular attraction force is weakened, and the penetrating power of the ink from the capillary to the paper is attenuated. Absorption of oxygen also decreases, delaying the drying time of the blot.
2, the ambient temperature and humidity
When the temperature rises, the movement speed of the material molecules increases, the energy in the molecules increases, and it is easy to generate more peroxides with those activated groups in the ink molecules, thereby accelerating the polymerization of the oil molecules. The ink ink film drying process is an exothermic reaction. When the printed sheet is dry, it releases heat, which in turn promotes the drying of the print. So, as the temperature rises, the oxidative polymerization of the ink will increase, which accelerates the drying.
As the humidity increases, the activity of oxygen in the air will also weaken, which reduces the ink's inhalation of oxygen. At the same time, the emulsified moisture in the ink film will also soften the ink film, which will slow down the drying of the ink.
3, a variety of ink auxiliary materials
Transparent; lighter and detackifiers, etc. have the property of inhibiting the drying of the ink, making the drying of the print slower.
Diluents are Weili oil, white ink, white oil and so on. The main components of Weili oil are linker and aluminum hydroxide. Common aluminum hydroxide often contains aluminum oxide, which is insoluble in water. Since the aluminum hydroxide is easily decomposed in water, the degree of emulsification of the ink is increased in printing, so that the print is dried more slowly. Wiley oil is generally used as a dilute agent for multi-color overprint inks for common products. The light ink colors have no effect basically, but the brightness is generally low and drying is slow. White oil is a white translucent emulsion that can be used to dilute the ink color. It can reduce the viscosity of the ink, the color is uniform, the white oil has no dryness, the pine contains moisture, and the ink accelerates the emulsification. After the water is absorbed into the ink layer, Gradually evaporate, blocking the polymerization of the ink oxidation process, a serious impact on the speed of the print drying.
In the offset printing process, in order to change the printability of the ink, or to reduce the viscosity of the ink, often add non-drying accessories such as de-bonding agent, basically does not affect the gloss and fluidity of the ink color, but can not use too much, The content in the ink is less than 5%, because of its non-dryness and permeability of the material, it is easy to cause the imprint of the slow drying of the imprint.
In general, if the ink needs to be diluted and detackified, the amount of driers should be increased accordingly in the ink.
4, hopper solution
The solution in the funnel is inseparable from the acidic substances, such as phosphoric acid, and its function is to supplement the inorganic salt layer lost in the printing process in the gravure plate. Phosphoric acid and other acidic substances have the function of cleaning the ink, and acidity will cause the drying of the ink to be damaged. The stronger the acidity of the fountain solution, the slower the drying time of the ink. Therefore, to control the PH value of the water bucket solution, when the water bucket solution is formulated, it is necessary to operate according to the instructions of the wetting powder. Do not add more water to the water and add a gum arabic to enhance the hydrophilicity. The ability to remove dirt reduces the effect of ink emulsification after drying.
5, the distribution of the text and the thickness of the ink layer
In the offset printing process, the graphic area is large and evenly distributed. The surface of the printing plate has a large amount of water. Because the water consumption is even, the emulsification value of the ink on each part of the surface of the ink roller is larger, and the quit phenomenon needs to be prevented in addition to the increase. In addition to the driers, it is more important to strictly control the surface moisture, reduce the emulsification of the ink, and ensure the timely drying of the blot.
If the ink layer is too thick, the contact between the ink layer and the air will be reduced. When the film is formed on the surface of the ink layer, the speed of oxygen in the air entering the ink film is retarded. With thick ink layer, the contact between the imprinted ink and the paper will be reduced correspondingly, and the permeation will be reduced accordingly. Therefore, if the ink layer is too thick, the drying speed will be slow, and the thickness of the ink layer will adjust the dosage of the driers. It is necessary to control the thickness of the imprinted ink layer to avoid the appearance of large ink droplets on offset printing. One-sided emphasis on "colorful, thick ink" and excessively increase the amount of ink caused by the ink layer thickness is too large drawbacks.
6, delivery paper transfer
The stacking of printed sheets and the speed of imprinting are affected. The offset printing ink is an oxidative polymerization type drying. The ink film of the printing ink is transferred onto the paper. The ink film is dried and reacts with the oxygen in the air to produce an oxidative polymerization exothermic reaction. The surface is smooth and the stacking is high. The air is difficult to contact with the imprint. A printed sheet is bound to appear, the middle part is too thick, and the sheet is dry slowly.
In order to speed up the drying of the blotting ink film, it is often adopted to use a dry paperboard rack to layer and pile on the delivery table to reduce stacking and thicken, to speed up drying, or to wait for a certain period of time after printing of the printed sheets to shake off the printed semi-finished products. The purpose is to increase the contact between the print and the air and accelerate drying.
1. Reorganization of substrates
The effect of paper pH on blotting drying. The paper is preferably neutral, but most of the paper is weakly alkaline, and the acidic paper tends to have a great influence on the drying of the print. Once, our factory used 157g/m2 coated paper to print the outer packaging of a wire factory. After printing the first background, we waited for one day and did not see it. A manufacturer's coated paper was reprinted, the same ink and machine, and the paper blotting afterwards was very suitable for drying. Afterwards, we negotiated with the coated paper mill. After the analysis, it was the acidity of the coated paper, which inhibited the drying of the ink and responded. Return payment processing. When the paper is acidic, it can make the ink layer dry for a few days.
The fiber structure of the paper affects the drying of the print. Rough surface, loose structure, high permeability, less sizing paper, imprinted and dried quickly. On the contrary, the surface smoothness is high, the fiber is tough and dense, and the paper with much coating and rubber material is applied, and the imprinting is slow drying.
The moisture content of the paper itself also affects blotting drying. Papers with high water content have reduced strength, the paper becomes fluffy, the fibers are in a relaxed state, and some capillaries are blocked by water molecules, so the intermolecular attraction force is weakened, and the penetrating power of the ink from the capillary to the paper is attenuated. Absorption of oxygen also decreases, delaying the drying time of the blot.
2, the ambient temperature and humidity
When the temperature rises, the movement speed of the material molecules increases, the energy in the molecules increases, and it is easy to generate more peroxides with those activated groups in the ink molecules, thereby accelerating the polymerization of the oil molecules. The ink ink film drying process is an exothermic reaction. When the printed sheet is dry, it releases heat, which in turn promotes the drying of the print. So, as the temperature rises, the oxidative polymerization of the ink will increase, which accelerates the drying.
As the humidity increases, the activity of oxygen in the air will also weaken, which reduces the ink's inhalation of oxygen. At the same time, the emulsified moisture in the ink film will also soften the ink film, which will slow down the drying of the ink.
3, a variety of ink auxiliary materials
Transparent; lighter and detackifiers, etc. have the property of inhibiting the drying of the ink, making the drying of the print slower.
Diluents are Weili oil, white ink, white oil and so on. The main components of Weili oil are linker and aluminum hydroxide. Common aluminum hydroxide often contains aluminum oxide, which is insoluble in water. Since the aluminum hydroxide is easily decomposed in water, the degree of emulsification of the ink is increased in printing, so that the print is dried more slowly. Wiley oil is generally used as a dilute agent for multi-color overprint inks for common products. The light ink colors have no effect basically, but the brightness is generally low and drying is slow. White oil is a white translucent emulsion that can be used to dilute the ink color. It can reduce the viscosity of the ink, the color is uniform, the white oil has no dryness, the pine contains moisture, and the ink accelerates the emulsification. After the water is absorbed into the ink layer, Gradually evaporate, blocking the polymerization of the ink oxidation process, a serious impact on the speed of the print drying.
In the offset printing process, in order to change the printability of the ink, or to reduce the viscosity of the ink, often add non-drying accessories such as de-bonding agent, basically does not affect the gloss and fluidity of the ink color, but can not use too much, The content in the ink is less than 5%, because of its non-dryness and permeability of the material, it is easy to cause the imprint of the slow drying of the imprint.
In general, if the ink needs to be diluted and detackified, the amount of driers should be increased accordingly in the ink.
4, hopper solution
The solution in the funnel is inseparable from the acidic substances, such as phosphoric acid, and its function is to supplement the inorganic salt layer lost in the printing process in the gravure plate. Phosphoric acid and other acidic substances have the function of cleaning the ink, and acidity will cause the drying of the ink to be damaged. The stronger the acidity of the fountain solution, the slower the drying time of the ink. Therefore, to control the PH value of the water bucket solution, when the water bucket solution is formulated, it is necessary to operate according to the instructions of the wetting powder. Do not add more water to the water and add a gum arabic to enhance the hydrophilicity. The ability to remove dirt reduces the effect of ink emulsification after drying.
5, the distribution of the text and the thickness of the ink layer
In the offset printing process, the graphic area is large and evenly distributed. The surface of the printing plate has a large amount of water. Because the water consumption is even, the emulsification value of the ink on each part of the surface of the ink roller is larger, and the quit phenomenon needs to be prevented in addition to the increase. In addition to the driers, it is more important to strictly control the surface moisture, reduce the emulsification of the ink, and ensure the timely drying of the blot.
If the ink layer is too thick, the contact between the ink layer and the air will be reduced. When the film is formed on the surface of the ink layer, the speed of oxygen in the air entering the ink film is retarded. With thick ink layer, the contact between the imprinted ink and the paper will be reduced correspondingly, and the permeation will be reduced accordingly. Therefore, if the ink layer is too thick, the drying speed will be slow, and the thickness of the ink layer will adjust the dosage of the driers. It is necessary to control the thickness of the imprinted ink layer to avoid the appearance of large ink droplets on offset printing. One-sided emphasis on "colorful, thick ink" and excessively increase the amount of ink caused by the ink layer thickness is too large drawbacks.
6, delivery paper transfer
The stacking of printed sheets and the speed of imprinting are affected. The offset printing ink is an oxidative polymerization type drying. The ink film of the printing ink is transferred onto the paper. The ink film is dried and reacts with the oxygen in the air to produce an oxidative polymerization exothermic reaction. The surface is smooth and the stacking is high. The air is difficult to contact with the imprint. A printed sheet is bound to appear, the middle part is too thick, and the sheet is dry slowly.
In order to speed up the drying of the blotting ink film, it is often adopted to use a dry paperboard rack to layer and pile on the delivery table to reduce stacking and thicken, to speed up drying, or to wait for a certain period of time after printing of the printed sheets to shake off the printed semi-finished products. The purpose is to increase the contact between the print and the air and accelerate drying.
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