In the traditional printing press, the quality of the rubber roller is crucial to whether the printed product can obtain the ideal ink color. The color printing equipment is generally equipped with an ink transfer roller, a uniform ink roller and an ink roller, and the ink ink roller of the ink roller is the one that has a greater impact on the color quality of the printing ink. The quality of the rubber roller is mainly manifested in the aspects of elasticity, viscosity, center of roundness and surface finish, etc., which mainly affects the color density of the ink is the viscosity. In the printing process, the rubber roller should maintain a certain viscosity to ensure that the ink applied to the plate surface is consistent every printing cycle. But in the actual production process, the viscosity of the rubber roller is not stable. Due to the increase of paper dust in the ink, and the soap tackifier on the surface of the rubber roller is lost with the increase of temperature and the use time, the viscosity of the rubber roller surface will be Gradually weakened, the ink absorption performance also decreased accordingly, thereby affecting the balance of the ink color of the printed product. Therefore, printing color products should use polyurethane rubber rollers or leather rubber rollers with stable quality. If the printing volume is large, the rubber roller should be cleaned in time to remove impurities on the rubber roller to ensure the printing quality of the product.
Effect of temperature on printing ink color
Due to the thixotropic nature of the ink, when the printing environment temperature is high, the ink becomes thinner, making the printing ink lighter. Conversely, when the temperature of the printing environment drops, the ink will thicken, and the ink color of the product will also become darker. In the practice of printing production, we found that under low temperature and slow machine speed, the ink in the ink fountain often has poor conveyance and abnormal ink supply, which causes the ink color of the printed product to become lighter and lighter, which affects the quality of the ink color. The stability of this is the main performance of the ink's poor thixotropy. In this regard, we must pay attention to constantly stirring the ink in the ink fountain, so that it maintains continuous and uniform fluidity, and ensures the stability of the ink color quality of the product. Therefore, printing color products should pay attention to the selection of high-grade ink, its thixotropy is relatively stable, which is conducive to improving the quality of the ink color of printed products. In order to prevent the ink viscosity from changing too much and affecting the balance of the ink color of the printed product, the production workshop for printing color products should try to use the constant temperature and humidity process conditions; the speed of the printing machine should not be too fast, and use a constant speed for printing; Unused rubber rollers should be removed as much as possible; the contact pressure between the rubber roller and the ink roller should not be adjusted too tight; do not use a hard rubber roller; the contact between the rubber roller, water roller and printing plate should be appropriate to minimize The coefficient of friction in the printing process minimizes the effect of frictional heat on the characteristics of the ink and reduces the effect of the thixotropy of the ink on the color of the printing ink.
Effect of temperature on printing ink color
Due to the thixotropic nature of the ink, when the printing environment temperature is high, the ink becomes thinner, making the printing ink lighter. Conversely, when the temperature of the printing environment drops, the ink will thicken, and the ink color of the product will also become darker. In the practice of printing production, we found that under low temperature and slow machine speed, the ink in the ink fountain often has poor conveyance and abnormal ink supply, which causes the ink color of the printed product to become lighter and lighter, which affects the quality of the ink color. The stability of this is the main performance of the ink's poor thixotropy. In this regard, we must pay attention to constantly stirring the ink in the ink fountain, so that it maintains continuous and uniform fluidity, and ensures the stability of the ink color quality of the product. Therefore, printing color products should pay attention to the selection of high-grade ink, its thixotropy is relatively stable, which is conducive to improving the quality of the ink color of printed products. In order to prevent the ink viscosity from changing too much and affecting the balance of the ink color of the printed product, the production workshop for printing color products should try to use the constant temperature and humidity process conditions; the speed of the printing machine should not be too fast, and use a constant speed for printing; Unused rubber rollers should be removed as much as possible; the contact pressure between the rubber roller and the ink roller should not be adjusted too tight; do not use a hard rubber roller; the contact between the rubber roller, water roller and printing plate should be appropriate to minimize The coefficient of friction in the printing process minimizes the effect of frictional heat on the characteristics of the ink and reduces the effect of the thixotropy of the ink on the color of the printing ink.
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