Influence of ink layer condition of the hottest pr

2022-08-18
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The influence of the ink layer condition of printed matter on the coating quality

the ink layer condition of printed matter mainly refers to the nature of paper, ink performance, ink layer thickness, graphic area and printed graphic density, etc. their influence on the coating quality is mainly the influence on the bonding strength between the printing crystal and the film

ink layer thickness

when the ink layer of the printed matter is thick and the image and text area is large, the ink changes the surface characteristics of the paper with many pores, seals many paper fiber pores, and hinders the penetration and diffusion of the adhesive, making it difficult for the printed matter to bond with the plastic film, and prone to delamination, blistering and other failures. Therefore, when making process selection, we should choose offset printing to print the products to be covered with film, because the ink layer of offset printing products is thin

function of ink diluents

commonly used ink diluents include white ink, viride oil and gloss paste. Among them, there are obvious powdery particles in the white ink, which are not tightly combined with the binder. After printing, these pigment particles will float on the paper and hinder the adhesion. Vegan stable oil is rolled from aluminum hydroxide and binder. Because aluminum hydroxide is light, it often floats on the surface of the ink layer after printing. When covering the film, an isolation layer is formed between the adhesive and the ink layer, resulting in poor adhesion or blistering. Gloss paste is made of resin, dry vegetable oil, desiccant, etc., with fine texture and bright conjunctiva. It has similar properties with the conjugated multi bond terpene resin, which is the main component with higher transmission effect. They have good affinity and can firmly adsorb the polypropylene film on the ink surface

addition of dry oil

adding dry oil to the ink can accelerate the drying of the imprint, but the amount of dry oil is large, which is easy to make the surface of the ink layer form an oil bright light. Experts and scholars from China's manned space flight and the national microbial research field gather in the low interface layer of Shishi City, Fujian Province. The adhesive is difficult to wet and penetrate, affecting the fastness of the coating. Therefore, the amount of dry oil should be controlled

powder spraying

offset printing adopts the powder spraying process to avoid the printing crystal rubbing dirty, and the powder spraying forms a layer of fine particles on the surface of the ink layer. When laminating, the adhesive is not bonded with the ink layer everywhere, but with these powders, forming a false adhesion phenomenon, which seriously affects the quality of lamination. Therefore, the products to be coated should avoid the use of powder spraying technology. The printed matter that has been sprayed should be used to wipe the powder off the cloth one by one

the essence of dirty printing is ink. In order to solve this problem, we must improve the ink process. Adding 10% gram adhesive to the ink in proportion is very effective in preventing dirty printing. After the ink is added with tacky agent, it not only prevents dirt from sticking and does not affect the hue and color saturation of the print, but also makes the ink layer brighter and the dots clearer, and it is also more convenient for post press processing processes, such as calendering, film coating, bronzing, etc. Gram adhesive can replace dry oil, powder spray and other anti sticking and dirty materials

gold and silver ink prints

gold and silver ink are made of metal powder and binder. These metal powders are extremely poor in the uniformity of distribution and solid force in the binder, and it is easy to separate out during the drying process of the ink layer. These separated metal powders form a barrier between the ink layer and the adhesive layer, affecting the effective bonding of the two interfaces. This product will wrinkle and blister after being placed for a period of time. Therefore, the lamination of gold and silver ink prints should be avoided

printing ink layer drying condition

film coating when the ink is not completely dry, the high boiling point solvent contained in the ink is very easy to make the plastic film expand and elongate, which is the main reason for the foaming and delamination of the product after film coating. The sufficient drying of ink layer is the primary condition to ensure the quality of film covering. For products whose imprints are not dry and are eager to be coated, they can be placed in an oven for drying

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