The quality of the printed product is inextricably linked to the nature of the printed material. The smoothness of the paper, the pores of the paper fibers, the structure, the acidity and alkalinity, the absorptivity of the paper, the viscoelasticity, the whiteness of the paper, etc. The quality of the copy has a direct effect. Due to the different uses of the printed products, the difference in the type of paper at the time of printing has different requirements for its appearance and internal quality. Therefore, when selecting printed materials, the performance must be adapted to the quality of the printed products.
The quality of printed paper includes two aspects:
Appearance quality: dust, spots, fiber clusters, sand, light points, holes, creases, wrinkles, cracks, color and other aspects.
Intrinsic quality: physical properties, chemical properties, absorption properties, optical properties, surface properties, printability, etc.
Absorption performance of paper on print product quality
Offset paper requires that the paper absorbability is not too strong. Offset printing mainly depends on the dry form of the ink's oxidized conjunctiva. The pigment particles in the ink are much larger than the linker molecules. If the printing paper absorbs strongly, Then, the binder in the ink will be quickly penetrated into the pores of the paper fibers, and the particles of the pigment will precipitate on the surface of the paper, which will make the product lack luster, dim colors, and affect the product quality.
The size of the paper's absorbency also affects the effect of copying. Usually when printing loose textures, if the ink has high fluidity and low viscosity, the paper will absorb more ink binder. If the diameter of the pores is larger than the diameter of the pigment particles, then the binder will be absorbed. This reduces the saturation of the print and requires a corresponding increase in the thickness of the ink layer. However, increasing the thickness of the ink layer at the instant of imprinting will cause the ink to spread, causing dots to enlarge, which will affect the quality of imprinting.
The low absorbency paper can make most of the ink film appear on the surface of the paper, so that the ink layer has better saturation. In order to improve the quality of printed products, some papers are subjected to high-pressure rolling or rolling into various patterns, patterns, and other shapes after they are made. This is the texture paper and pattern paper. Its purpose is to make the structure of the paper more compact and absorbent. Reducing, improving the effect of copying the printed ink, making the picture, especially oil painting, more faithful. In short, different qualities of paper have obvious differences in quality and effect. It is difficult to reproduce high-quality products on the surface with rough surface, loose structure, and high absorbency. It is imperative to improve the printability of paper. Printing companies must choose the right paper according to the requirements of product quality.
Absorption performance of coated paper is generally strictly controlled between 30 and 60 seconds. If the absorptivity of coated paper is too strong, it often causes ink to be printed on the paper. The ink in the ink is quickly absorbed and the pigment floats. On paper, this will not only reduce the glossiness of the printed matter, but also make the ink unable to adhere firmly to the surface of the paper and wipe it with a little force. The image imprint will be wiped off or the flower will be produced, which will seriously affect the quality of the product.
Coated paper is suitable for printing thin cable products due to its high smoothness. Due to the poor flexibility of the paper surface, if the smoothness of the paper is not high, it will be difficult to obtain a completely clean and smooth dot, which will affect the product's level of sharpness and shape. At the same time, the rough surface will dim the imprint, so high-quality coated paper should have With a high smooth finish, fine and clear fine mesh patterns can be obtained, making prints pleasing and pleasing to the eye. The smoothness is high, the paper absorption is weak, the surface of the relief paper is rough, the paper is loose, the smoothness is poor, and the ink absorption performance of the paper is strong.
Factors Affecting Paper Absorption
1 The ink absorption of paper is related to the smoothness of the surface of the paper fibers. The smoother the surface of the paper, the weaker its ink absorption, the surface of the paper is rough, the paper is loose, and the ink absorption is stronger.
2 The ink absorption of paper is related to the quality of the filler. If kaolin (white clay) is selected as the papermaking filler, the paper will have good ink absorption. The use of talc, gypsum powder, calcium carbonate, magnesium hydroxide, barium sulfate as filler, the ink absorption is weaker.
3 The ink absorption of the paper is related to the amount of glue applied during the papermaking process. Appropriate application of rubber can enhance the paper's ink absorption.
4 The absorption of ink by paper is related to the pressure of the printing press and the length of the printing time. Large printing pressure, long stamping time, strong paper absorption, and vice versa.
5 is related to the viscosity of the ink used for printing. The viscosity of the ink is large, and the ink absorption of the paper will be strong.
6 related to the structure of the paper itself. Papers containing more lignin are more absorbent, such as newsprint. In the process of papermaking, the paper with less filler or compound has higher ink absorption.
Why do some papers have strong ink absorption, and some papers have poor ink absorption? This is because the absorption of ink and the absorption of ink by paper are caused by the mutual action of both paper and ink. Too much or too weak ink absorption of the paper has an impact on the quality of the printed product. The ink absorption of the paper is too strong. The binder in the ink will be absorbed in large quantities by the paper. Although the drying of the print is accelerated, it is likely to result in imprinting failure. The disadvantages of “powdering†and “printing through†and poor glossiness of printed products; on the contrary, the ink absorption of the paper is too weak, and the linking material in the ink cannot be absorbed normally, resulting in the imprint being unable to dry as expected and delaying the process. The ink layer is dry, which may cause the back of the printed product to be dirty.
In summary, the paper's ink absorption is closely related to the quality of the printed product, and it is necessary to take corresponding measures to improve the printing quality in accordance with the ink absorption performance of the paper, respectively, the printability of the high-speed ink and the control of the amount of dry oil.
The quality of printed paper includes two aspects:
Appearance quality: dust, spots, fiber clusters, sand, light points, holes, creases, wrinkles, cracks, color and other aspects.
Intrinsic quality: physical properties, chemical properties, absorption properties, optical properties, surface properties, printability, etc.
Absorption performance of paper on print product quality
Offset paper requires that the paper absorbability is not too strong. Offset printing mainly depends on the dry form of the ink's oxidized conjunctiva. The pigment particles in the ink are much larger than the linker molecules. If the printing paper absorbs strongly, Then, the binder in the ink will be quickly penetrated into the pores of the paper fibers, and the particles of the pigment will precipitate on the surface of the paper, which will make the product lack luster, dim colors, and affect the product quality.
The size of the paper's absorbency also affects the effect of copying. Usually when printing loose textures, if the ink has high fluidity and low viscosity, the paper will absorb more ink binder. If the diameter of the pores is larger than the diameter of the pigment particles, then the binder will be absorbed. This reduces the saturation of the print and requires a corresponding increase in the thickness of the ink layer. However, increasing the thickness of the ink layer at the instant of imprinting will cause the ink to spread, causing dots to enlarge, which will affect the quality of imprinting.
The low absorbency paper can make most of the ink film appear on the surface of the paper, so that the ink layer has better saturation. In order to improve the quality of printed products, some papers are subjected to high-pressure rolling or rolling into various patterns, patterns, and other shapes after they are made. This is the texture paper and pattern paper. Its purpose is to make the structure of the paper more compact and absorbent. Reducing, improving the effect of copying the printed ink, making the picture, especially oil painting, more faithful. In short, different qualities of paper have obvious differences in quality and effect. It is difficult to reproduce high-quality products on the surface with rough surface, loose structure, and high absorbency. It is imperative to improve the printability of paper. Printing companies must choose the right paper according to the requirements of product quality.
Absorption performance of coated paper is generally strictly controlled between 30 and 60 seconds. If the absorptivity of coated paper is too strong, it often causes ink to be printed on the paper. The ink in the ink is quickly absorbed and the pigment floats. On paper, this will not only reduce the glossiness of the printed matter, but also make the ink unable to adhere firmly to the surface of the paper and wipe it with a little force. The image imprint will be wiped off or the flower will be produced, which will seriously affect the quality of the product.
Coated paper is suitable for printing thin cable products due to its high smoothness. Due to the poor flexibility of the paper surface, if the smoothness of the paper is not high, it will be difficult to obtain a completely clean and smooth dot, which will affect the product's level of sharpness and shape. At the same time, the rough surface will dim the imprint, so high-quality coated paper should have With a high smooth finish, fine and clear fine mesh patterns can be obtained, making prints pleasing and pleasing to the eye. The smoothness is high, the paper absorption is weak, the surface of the relief paper is rough, the paper is loose, the smoothness is poor, and the ink absorption performance of the paper is strong.
Factors Affecting Paper Absorption
1 The ink absorption of paper is related to the smoothness of the surface of the paper fibers. The smoother the surface of the paper, the weaker its ink absorption, the surface of the paper is rough, the paper is loose, and the ink absorption is stronger.
2 The ink absorption of paper is related to the quality of the filler. If kaolin (white clay) is selected as the papermaking filler, the paper will have good ink absorption. The use of talc, gypsum powder, calcium carbonate, magnesium hydroxide, barium sulfate as filler, the ink absorption is weaker.
3 The ink absorption of the paper is related to the amount of glue applied during the papermaking process. Appropriate application of rubber can enhance the paper's ink absorption.
4 The absorption of ink by paper is related to the pressure of the printing press and the length of the printing time. Large printing pressure, long stamping time, strong paper absorption, and vice versa.
5 is related to the viscosity of the ink used for printing. The viscosity of the ink is large, and the ink absorption of the paper will be strong.
6 related to the structure of the paper itself. Papers containing more lignin are more absorbent, such as newsprint. In the process of papermaking, the paper with less filler or compound has higher ink absorption.
Why do some papers have strong ink absorption, and some papers have poor ink absorption? This is because the absorption of ink and the absorption of ink by paper are caused by the mutual action of both paper and ink. Too much or too weak ink absorption of the paper has an impact on the quality of the printed product. The ink absorption of the paper is too strong. The binder in the ink will be absorbed in large quantities by the paper. Although the drying of the print is accelerated, it is likely to result in imprinting failure. The disadvantages of “powdering†and “printing through†and poor glossiness of printed products; on the contrary, the ink absorption of the paper is too weak, and the linking material in the ink cannot be absorbed normally, resulting in the imprint being unable to dry as expected and delaying the process. The ink layer is dry, which may cause the back of the printed product to be dirty.
In summary, the paper's ink absorption is closely related to the quality of the printed product, and it is necessary to take corresponding measures to improve the printing quality in accordance with the ink absorption performance of the paper, respectively, the printability of the high-speed ink and the control of the amount of dry oil.
Ningbo Yinzhou Hengxi Winbate Household Product Manufacturer , https://www.winbatehousehold.com