Selection of art paper printing ink

Due to the particularity of the art paper in raw materials and papermaking process, art paper has great differences in paper structure and performance from ordinary paper, and there are different requirements for the selection of printing ink and the printing process. There are three points to note when choosing inks and printing.

Pay attention to the ink absorption of art paper

Different art papers have great differences in the absorption of inks. For example, cupboards are easy to absorb ink, and Laini's paper is easier to absorb ink. Sulfuric acid paper is difficult to absorb ink. In printing, ink absorption is directly related to the quality of the printed product and the drying time. Art papers with different ink absorption properties can usually be controlled by adjusting the printing pressure and adding ink additives. For example, for papers with poor ink absorption, The driers are properly added to the ink or cured by ultraviolet light so as to prevent the ink from drying too slowly and causing the back surface to be dirty and the prints to be powdered. Of course, the structure of the paper has a great influence on ink absorption. Some papers have a loose texture and the ink can easily penetrate and dry; while others have a very tight texture and the ink floats on the surface of the paper, so that it is not easily penetrated into the paper and is less likely to dry.

Pay attention to the smoothness of art paper

The difference in papermaking process makes art papers have large differences in paper quality. For example, some papers are relatively bulky and have low smoothness, some are relatively tight, and smoothness is high. Such as the printing of thicker art paper, the printing pressure should not be too large, otherwise it will undermine the characteristics of this type of art paper shading obvious, and make the paper deformation. On the other hand, if it is an art paper with a more closely printed texture, the pressure on printing should be appropriately increased. In addition, some art papers also have embossed effects (such as embossed paper) and stripe-grained effects (such as bamboo paper). For this type of art paper, printing inks are not used (or used less) as far as the use of natural paper is concerned. Dyed lines, for some simple local processing, such as embossing, UV glazing, hot stamping, etc., try to retain and use the essence of the original paper, you can achieve the desired decorative effect. For ink printing, pay special attention to controlling the printing pressure.

Pay attention to some other features of art paper

Art paper also has characteristics that plain paper does not have, such as texture. We know that paper is a flat material, and it can be visually perceived as a visual texture of materials, such as stripes, patterns, etc., which are designed using people's visual texture. In the packaging and printing, the texture is more and more valued. For example, in order to make people feel the tactile pleasure of the surface of the packaging material, a wide variety of art papers (such as embossed paper, paper, etc.) with different textures are widely used. In print design, the use of rough, textured paper is an important texture design. Printing on the rough textured art paper surface can further enhance the texture. Even a small pattern printed on Mammoth Lipu paper with a fine concave-convex effect has a very good visual texture effect. In addition, different materials have different textures (ie, texture). The texture has natural textures and textures. The various types of art paper used in printing are the textures obtained through processing. The texture is based on visual texture and tactile texture. The visual texture is a two-dimensional plane texture. The tactile texture is generally obtained through processing methods such as squaring, die-cutting, and engraving. It is a three-dimensional texture that can be felt by hand. Art paper has better texture and texture than plain paper, and it provides a lot of material for packaging design from the macro and micro world. For these art papers, the nature of the paper should be used as much as possible, printing with less ink (especially large area printing), and the printing pressure should be controlled during printing.

Finally, when it comes to the printing of gold and silver ink on art paper, many customers will use silver ink and gold ink in order to pursue their appearance. However, in the design process, the layout should be properly designed according to the characteristics of art paper and the printing process. Not only must be beautiful, but also fully take into account the characteristics of gold and silver ink and printing process requirements, try to avoid printing failures that should not occur. Gold and silver inks are gold-silver-density inks that produce high-aggregation state by using particles of gold powder or silver powder (generally copper, aluminum powder or copper, aluminum flakes) instead of pigment particles. The most important feature of gold and silver ink printing is that it can display the unique suspension properties and color-forming properties of gold and silver powder after printing, and ensure the stability of quality and no discoloration during storage. The most important feature of gold and silver ink printing is that it can display the unique suspension properties and color-forming properties of gold and silver powder after printing, and ensure the stability of quality and no discoloration during storage. Gold and silver ink printing should be selected according to the characteristics of art paper. Generally speaking, gold and silver inks are used in the field parts or color blocks, but it is better not to design gold or silver for the very small intaglio, yang text or level transition. . In the process of plate design, the arrangement of the color and silver of the gold and silver ink should be taken into consideration to ensure the metallic color. Also consider the requirements for gold and silver ink for art paper. If the absorption of ink on art paper is very strong, the linking material will be quickly absorbed, and the metal pigment in the ink will float on the surface of art paper, lose its luster, become weakly attached, and even fall off. The strong acid art paper easily reacts with the metal powder, causing discoloration and loss of luster in the metal pigment. When printing gold and silver ink on art paper, the background ink is first applied. For example, when printing silver ink, a faint white ink is applied first, so that the gloss of the silver ink layer can be improved, and the silver ink can also be attached to the paper. Focus on. Some products, after printing gold and silver inks, should also consider UV coating or water-based coating, or laminating to prevent the metal pigments from discoloring or falling off.

Gold and silver ink printing requires a special printing process, and the durability of gold and silver ink is generally worse than that of pigment particles, but it can be protected by using a print coating or a glazing layer. With inks made from powdered metallic pigments, there is a thickening (thickness) phenomenon on the printing press, and inks prepared with wet gold-silver paste pigments are better. In printing, gold and silver inks have low viscosity characteristics and are suitable for transfer between ink rollers, making the printing process cleaner. For substrates, rough art paper will prevent fine gold and silver ink particles from forming metal foil on the surface of the paper and reduce the printing effect of gold and silver ink. In addition, the use of gold and silver ink printing function is mainly to highlight its metal characteristics, due to the opacity of other inks will affect the metal effect, therefore, in the arrangement of printing color sequence, generally require the gold and silver ink on the final printing. Because the opacity of the gold and silver ink will result in compensating too much ink, only by using more ink to achieve the desired metal effect, but this will cause the ink to appear unbalanced phenomenon, giving the dampening system too much burden , causing paste and dirty and other faults. The best way to prevent these malfunctions is to add ink to a lighter color image so that it covers the image exactly. Then, increase the amount of ink, and adjust the amount of water supply so that it is slightly higher than the minimum value, so as to avoid the non-graphic part of the ink. In order for the gold and silver inks to have good printability, the selected varnish (transfer oil and silver adjustment oil) must have sufficient viscosity, good chemical stability, good transparency, and poor drying. Excellent performance, to ensure that the varnish and gold and silver powder can be evenly mixed, and can improve the color performance of gold and silver powder, so that the metal luster and coloring ability is stronger.