Offset printing is the use of the principle of oil-water immiscibility to form a stable graphic part and a stable blank part on the printing plate, so that it has the ability to selectively adsorb water and ink, and the ink is transferred to the paper by mechanical force or the like. On other substrates, the purpose of restoring the original was achieved. The main factors that affect the effect of the restoration are:
1. The thickness of the pigment particles in the ink ink directly affects the color of the ink, the saturation of the color, the layering of the ink, and the clarity of the performance. The emulsification value of the ink made of different nature pigments is related to a large amount. Therefore, the pigment of the offset printing ink is preferably insoluble in water and acid, and has hydrophobic properties, and fine particles are preferred.
The influence of the acid value of the ink: The polarity of the ink is based on the amount of free fatty acid in the linking material. The more the content, the stronger the polarity, and the greater the influence on the emulsification. At the same time, the stronger the polar adsorption of the ink, the higher the electrolyte solution must be used, and the result is more emulsification.
The viscosity of the ink influences: the greater the viscosity, the greater its cohesion, thereby increasing its hydrophobic properties. In contrast to the fluidity and viscosity of the ink, the greater the fluidity, the greater the degree of emulsification. Therefore, in the printing, according to the product and the customer's request, choose to use different types of ink. Control the amount of dry oil in the printing process, preferably 1%-2%. According to the situation, it is advisable to add a certain amount of varnish, generally no more than 5%. Do not add ink additives at will to achieve the best reduction effect of the ink.
Second, the paper, paper coatings, rubber compound containing surface active substances. Under the action of the mechanical force, a part of the active material enters into the fountain solution and the surface tension of the fountain solution decreases. It also affects the surface tension of water and ink, thus promoting the emulsification of the ink and affecting the reduction effect of the ink.
The difference in paper is not the same for the printing effect. For example, the thickness, smoothness, smoothness, reflective property of the surface of the paper, and the degree of firmness of the surface additive and rubber compound, as well as the adsorption of ink to different papers, are quite different. All these factors affect the print reproduction of the product.
Therefore, it is necessary to control the moisture of the layout during printing, and wash the blankets in order to avoid the accumulation of ink and dust, paper powder and accumulation. The cleaning of the fountain solution and the good performance of the paper are the key to ensure the printing quality.
Third, water in the printing process, the surface of the printing plate forms a layer of water film. The inks are in contact with each other under the action of mechanical forces, and normally maintain the relative stability and balance of oil and water. If the surface water is too large and the emulsification of the ink is intensified, the ink-colored portion will be washed out, the graphic is dry, the outline is unclear, the color is old, and the coloring power of the ink is reduced. When the amount of ink is increased, it causes the outlets to be unclear, the levels are unclear, the colors are apt to be deviated, the lack of gloss, the drying of the prints becomes slower, and the back surface becomes dirty. After emulsification, the printing plate is easy to produce dingy, floral, paste and ink roller deinking, which brings great difficulties to the printing operation.
Therefore, we must maintain the balance of ink and wash in printing, use the fountain solution correctly, control the amount of water, and ensure the smooth progress of printing.
Fourth, mechanical performance printing, at a steady speed, water and ink basically maintain a stable two phases. The faster the vehicle speed, the greater the mechanical force, and the easier it is to break the tension between the two interfaces and increase the emulsification. The fast and slow speed of the vehicle will also make the ink darker. Therefore, maintaining the uniform rotation of the vehicle speed means maintaining ink and ink balance, ensuring the stability of the ink color, and ensuring the product quality.
The water transfer performance of the water roller and water fleece also directly affects the stability and uniformity of the water transfer. Adjust the pressure of the water roller and the ink roller to ensure stable supply of ink supply and water supply, ensure the balance of ink and ink, and ensure the printing quality.
Adjust the pressure of the plate cylinder and the blanket cylinder so that the dots will not be lost, or the dots will be enlarged and deformed, so that the printing can be properly restored to achieve the best reduction effect.
Fifth, the influence of temperature, humidity, temperature and humidity on printing is great. When the temperature of the shop is high, the ink will increase its flow performance due to the increase of temperature and mechanical force, and the molecular attraction force between the inks will weaken. The amount of water used in printing increases, which also accelerates the occurrence of emulsification. In printing, it is easy to dry, paste, and easy to ink. When the temperature is low, the ink has a large viscosity and it is difficult to apply ink. In the printing must add an appropriate amount of additives in the ink to reduce the viscosity of the ink to ensure the printing process. When the humidity is high, the paper is apt to absorb water and deform, and it is difficult to control the amount of water when printing, and the water absorption is large. Therefore, controlling the temperature and humidity of the workshop is very necessary for printing.
Influencing the printing and reducing effect are Plates, blankets and other factors. We only control all aspects in production, constantly sum up experience, sum up a set of effective printing operation procedures, and it is perfectly possible to print first-rate prints. ("Haida Print Materials Offers and Foreign Edition")
1. The thickness of the pigment particles in the ink ink directly affects the color of the ink, the saturation of the color, the layering of the ink, and the clarity of the performance. The emulsification value of the ink made of different nature pigments is related to a large amount. Therefore, the pigment of the offset printing ink is preferably insoluble in water and acid, and has hydrophobic properties, and fine particles are preferred.
The influence of the acid value of the ink: The polarity of the ink is based on the amount of free fatty acid in the linking material. The more the content, the stronger the polarity, and the greater the influence on the emulsification. At the same time, the stronger the polar adsorption of the ink, the higher the electrolyte solution must be used, and the result is more emulsification.
The viscosity of the ink influences: the greater the viscosity, the greater its cohesion, thereby increasing its hydrophobic properties. In contrast to the fluidity and viscosity of the ink, the greater the fluidity, the greater the degree of emulsification. Therefore, in the printing, according to the product and the customer's request, choose to use different types of ink. Control the amount of dry oil in the printing process, preferably 1%-2%. According to the situation, it is advisable to add a certain amount of varnish, generally no more than 5%. Do not add ink additives at will to achieve the best reduction effect of the ink.
Second, the paper, paper coatings, rubber compound containing surface active substances. Under the action of the mechanical force, a part of the active material enters into the fountain solution and the surface tension of the fountain solution decreases. It also affects the surface tension of water and ink, thus promoting the emulsification of the ink and affecting the reduction effect of the ink.
The difference in paper is not the same for the printing effect. For example, the thickness, smoothness, smoothness, reflective property of the surface of the paper, and the degree of firmness of the surface additive and rubber compound, as well as the adsorption of ink to different papers, are quite different. All these factors affect the print reproduction of the product.
Therefore, it is necessary to control the moisture of the layout during printing, and wash the blankets in order to avoid the accumulation of ink and dust, paper powder and accumulation. The cleaning of the fountain solution and the good performance of the paper are the key to ensure the printing quality.
Third, water in the printing process, the surface of the printing plate forms a layer of water film. The inks are in contact with each other under the action of mechanical forces, and normally maintain the relative stability and balance of oil and water. If the surface water is too large and the emulsification of the ink is intensified, the ink-colored portion will be washed out, the graphic is dry, the outline is unclear, the color is old, and the coloring power of the ink is reduced. When the amount of ink is increased, it causes the outlets to be unclear, the levels are unclear, the colors are apt to be deviated, the lack of gloss, the drying of the prints becomes slower, and the back surface becomes dirty. After emulsification, the printing plate is easy to produce dingy, floral, paste and ink roller deinking, which brings great difficulties to the printing operation.
Therefore, we must maintain the balance of ink and wash in printing, use the fountain solution correctly, control the amount of water, and ensure the smooth progress of printing.
Fourth, mechanical performance printing, at a steady speed, water and ink basically maintain a stable two phases. The faster the vehicle speed, the greater the mechanical force, and the easier it is to break the tension between the two interfaces and increase the emulsification. The fast and slow speed of the vehicle will also make the ink darker. Therefore, maintaining the uniform rotation of the vehicle speed means maintaining ink and ink balance, ensuring the stability of the ink color, and ensuring the product quality.
The water transfer performance of the water roller and water fleece also directly affects the stability and uniformity of the water transfer. Adjust the pressure of the water roller and the ink roller to ensure stable supply of ink supply and water supply, ensure the balance of ink and ink, and ensure the printing quality.
Adjust the pressure of the plate cylinder and the blanket cylinder so that the dots will not be lost, or the dots will be enlarged and deformed, so that the printing can be properly restored to achieve the best reduction effect.
Fifth, the influence of temperature, humidity, temperature and humidity on printing is great. When the temperature of the shop is high, the ink will increase its flow performance due to the increase of temperature and mechanical force, and the molecular attraction force between the inks will weaken. The amount of water used in printing increases, which also accelerates the occurrence of emulsification. In printing, it is easy to dry, paste, and easy to ink. When the temperature is low, the ink has a large viscosity and it is difficult to apply ink. In the printing must add an appropriate amount of additives in the ink to reduce the viscosity of the ink to ensure the printing process. When the humidity is high, the paper is apt to absorb water and deform, and it is difficult to control the amount of water when printing, and the water absorption is large. Therefore, controlling the temperature and humidity of the workshop is very necessary for printing.
Influencing the printing and reducing effect are Plates, blankets and other factors. We only control all aspects in production, constantly sum up experience, sum up a set of effective printing operation procedures, and it is perfectly possible to print first-rate prints. ("Haida Print Materials Offers and Foreign Edition")
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