The printing surface is the general name for the surface of the printing carrier and the ink layer, and is also the material basis for the color and gloss performance of the printed matter. In today's rapid development of modern printing, printing carriers are mainly paper and polymeric film two categories.
Paper
The smoothness and gloss of paper are mainly determined by the papermaking raw materials and the papermaking process. When the surface smoothness and gloss of the paper are high, no pressure is required to carry out embossing, and the contact area between the printing plate and the blanket can be maximized, and the transfer of the dots can be completed more uniformly and completely. Clear, rich levels, soft tone, full color, bright gratifying.
In order to improve the smoothness and gloss of the paper, paper mills apply water-based paint to the surface of the base paper and heat and dry it. In general, the heating and drying methods for water-based paints include hot-air drying and dry-cast drying. Coating papers have great differences in the mechanisms and processing methods used to remove water from applied coatings. The hot air surface is volatilized and dried. In the drying stage, hot air is used to force drying from the surface. Most of the water is evaporated on the coated surface. The molecular structure of the coating is arranged in an ordered manner along the evaporation direction toward the surface under the effect of heat, and the backside of the cast coating is infiltrated and dried. The drying stage is when the coating is in a wet state, it is pressed with a roller and pressed against a mirror hot cylinder for drying. The moisture of the coating is transmitted through the pores of the fiber. The molecular structure of the coating under the thermal action also follows the evaporation direction, but it is back-facing. Ordered. Regardless of the molecular structure that is arranged on the surface or on the back, there are always some more active molecules that are more active under heating conditions, and there is considerable energy to break away from the attraction of other molecules to the direction of the original row or in the opposite direction. Disorderly movement. When these coating molecules free from intermolecular gravitational motion reach the working surface of the applicator roll or cast coating cylinder, the enormous pressure generated by the application roller or the working interface of the cast coating cylinder forces them to continue to move and escape the coating in the coating. Stay on the surface. This kind of static on the surface of the coating is exactly the same as that of the application roller or the cast coating cylinder, although it is chrome-plated and throws off the river, but there are still fine lines and uneven positions of rough marks, which results in the absence of molecules when the hot-press coating layer is dried. As a result of the sequence movement, the surface of the paper should have a slight dent in the smooth surface, or increase some of the powder peaks, and thus appear different rough. When the light propagates to the surface of the paper, which is not so conspicuously noticeable, the uneven surface makes the reflection angle change, and the visual signal from the paper surface is weakened, ie, the glossiness is not strong.
Paper
The smoothness and gloss of paper are mainly determined by the papermaking raw materials and the papermaking process. When the surface smoothness and gloss of the paper are high, no pressure is required to carry out embossing, and the contact area between the printing plate and the blanket can be maximized, and the transfer of the dots can be completed more uniformly and completely. Clear, rich levels, soft tone, full color, bright gratifying.
In order to improve the smoothness and gloss of the paper, paper mills apply water-based paint to the surface of the base paper and heat and dry it. In general, the heating and drying methods for water-based paints include hot-air drying and dry-cast drying. Coating papers have great differences in the mechanisms and processing methods used to remove water from applied coatings. The hot air surface is volatilized and dried. In the drying stage, hot air is used to force drying from the surface. Most of the water is evaporated on the coated surface. The molecular structure of the coating is arranged in an ordered manner along the evaporation direction toward the surface under the effect of heat, and the backside of the cast coating is infiltrated and dried. The drying stage is when the coating is in a wet state, it is pressed with a roller and pressed against a mirror hot cylinder for drying. The moisture of the coating is transmitted through the pores of the fiber. The molecular structure of the coating under the thermal action also follows the evaporation direction, but it is back-facing. Ordered. Regardless of the molecular structure that is arranged on the surface or on the back, there are always some more active molecules that are more active under heating conditions, and there is considerable energy to break away from the attraction of other molecules to the direction of the original row or in the opposite direction. Disorderly movement. When these coating molecules free from intermolecular gravitational motion reach the working surface of the applicator roll or cast coating cylinder, the enormous pressure generated by the application roller or the working interface of the cast coating cylinder forces them to continue to move and escape the coating in the coating. Stay on the surface. This kind of static on the surface of the coating is exactly the same as that of the application roller or the cast coating cylinder, although it is chrome-plated and throws off the river, but there are still fine lines and uneven positions of rough marks, which results in the absence of molecules when the hot-press coating layer is dried. As a result of the sequence movement, the surface of the paper should have a slight dent in the smooth surface, or increase some of the powder peaks, and thus appear different rough. When the light propagates to the surface of the paper, which is not so conspicuously noticeable, the uneven surface makes the reflection angle change, and the visual signal from the paper surface is weakened, ie, the glossiness is not strong.
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