The performance requirements of water-based varnish for printing paper glazing are as follows: 1.The film has good environmental resistance. Some of the printed matter after glazing is used to make all kinds of packaging cartons, in order to be able to play a good protective effect on the packaged products, the environmental resistance of the glazing film layer must be better. For example, the packaging of food, cigarettes, cosmetics, clothing and other goods must have moisture-proof and mildew proof performance. After drying, the chemical resistance of the film layer should be stable, and its properties can not be changed by contact with chemical substances such as weak acids or weak bases in the environment 2.High transparency of the film layer, no discoloration. Prints to obtain excellent glazing effect, depends on the surface of the printed sheet to form a colorless transparent film, and after drying the text does not change color. It should not be discolored or yellowed due to sun exposure or long use time. 3.The film layer has a certain wear resistance. Printed paper requires a certain wear resistance and scratch resistance after glazing. 4.Good leveling, smooth film surface. There are many kinds of printing materials to print the impact of graphics, surface absorption, smoothness, wettability and so on are very different, in order to make the coating on the surface of different products can form a smooth film layer, requiring water-based polish smooth, smooth film surface. 5.With a certain flexibility. The bright film formed by any kind of water-based gloss oil on the surface of the printed matter must maintain good elasticity to adapt to the flexibility of paper or cardboard, and will not be damaged or cracked and fall off. 6. It has a certain adhesive force on the surface of printed matter. Due to the influence of the integral density of the ink layer on the surface of the printed matter, the surface adhesive suitability is greatly reduced. In order to prevent the film layer from dry cracking and defilm in use after drying, it is required that the film layer has strong adhesive force, and has certain adhesive force for ink and various auxiliary materials used in ink mixing.

1.There are many formulations of coated glue, and different formulations need to be determined according to the specific use. It generally includes basic glue, thickener, curing agent, auxiliaries and other ingredients. 2.Basic glue is the most important component of laminating glue, it can be selected according to different use requirements of different types, such as water-based, oily, diluent and so on. Thickeners can increase the viscosity of the glue, making it more suitable for coating on the film. The curing agent can make the coating glue cure quickly and improve the firmness of the coating. The additives can improve the water resistance, heat resistance, weather resistance and other properties of the film coated glue. 3.For different coated glue requirements, you can combine references to different formulations to determine the most appropriate formula. At the same time, attention needs to be paid to ensure the quality and proportion of each ingredient to give full play to the role of each ingredient.

Color paste, also known as pigment paste, is an important form of dye application, which is widely used in textile, ink, paint and other industries. In the classification of pastes, low-halogen pastes and ordinary pastes are two common types. They have certain differences in composition, performance and use, and the differences between the two types of pastes will be discussed in detail below. First of all, from the composition point of view, the main difference between low halogen color paste and ordinary color paste is the content of halogen elements. Halides are elements of the oxygen group, including fluorine, chlorine, bromine and iodine. Low halogen pastes refer to a class of pastes with low halogen element content, while ordinary pastes do not have special restrictions on halogen elements. Low halogen pastes are usually formulated with dyes with lower halide content to meet the requirements of environmental friendliness and safety performance. In contrast, the content of halide elements in ordinary colorants may be higher, but it does not necessarily have a serious impact on the environment. Secondly, there are also obvious differences in performance between low-halogen pastes and ordinary pastes. Low halogen pastes usually have better light resistance, durability and wash resistance. This is because the dyes selected in the low-halogen pastes have a more stable chemical structure, which can maintain the bright and stable color during long-term use. The performance of ordinary pastes in these aspects may be relatively weak, and problems such as fading and fading may occur. In addition, the use of low halogen color paste and ordinary color paste is also different. Because of its better environmental performance, low-halogen pastes have been widely used in some fields with high environmental requirements. For example, in the textile industry, low-halogen pastes can be used for dyeing and printing, which can not only add rich colors to the fabric, but also meet the requirements of the environmental protection industry chain. In the coating industry, the use of low-halogen pastes can reduce the emission of harmful gases and protect the atmospheric environment. In contrast, ordinary pastes are widely used in areas with relatively low environmental requirements. In general, there are obvious differences between low-halogen pastes and ordinary pastes in composition, performance and use. Low-halogen pastes pay more attention to environmental friendliness and safety performance, with better light resistance, durability and washable performance, and are widely used in industries with high environmental requirements. The ordinary color paste is more used in the field of relatively low environmental requirements. With the improvement of people's awareness of environmental protection, the application prospects of low-halogen color paste will be broader and become an important development direction of the color paste industry. It is hoped that through t...

The main difference is that the nature is different, the production process is different, and the characteristics are different, as follows: First, the nature is different 1.Flexo printing Flexo printing is a direct printing method known as flexo printing because of the use of elastic, raised image plates. 2.Gravure printing Gravure refers to gravure printing, first the printing plate on the excess ink scraping, and then through the impression roller to the printing plate between the printed matter, to apply appropriate pressure, the ink from the concave to the printed matter on a printing method. Second, different production processes 1.Flexo printing From the perspective of original design and platemaking process, flexographic printing process has its own system and its own unique features, and its platemaking process is basically as follows: Original manuscript → electronic color separation or photography → positive negative image → back exposure → main exposure → development rinse → drying → post-processing → post-exposure → pasting. 2.Gravure printing Gravure printing due to the high degree of automation of the printing machine, plate making quality is good, so the process operation is simpler than lithography, easy to master, the process flow is as follows: Pre-press preparation → on the plate → Adjust the rules → official printing → post-press processing. Three, different characteristics 1.Flexo printing (1)the equipment structure is relatively simple, so the operation is also relatively simple and convenient. (2) Flexographic printing is made of drum material, which can not only realize the double-sided printing of the substrate material, but also complete the work of wire glazing (or laminating), stamping, die-cutting, waste discharge, winding, etc. The production cycle is greatly shortened, manpower, material and financial resources are saved, and production costs are reduced. (3)the range of substrate materials is relatively wide, such as paper, plastic film, aluminum foil, self-adhesive paper and so on. (4)the print quality is good, the printing accuracy can reach 150 lines/inch, and the print layer is rich, the color is bright, the visual effect is good, especially suitable for the requirements of packaging printing. 2. Gravure printing (1) The ink-bearing part of the gravure plate is concave, so it can undertake a large amount of ink, such as the electrostatic ink absorption device used with the gravure press, it can obtain a solid ink layer, bright colors and rich levels. (2)the relative cost is low because the entire page of the gravure printing plate is protected by a hard metal chromium layer, so even when the scraper is in contact with the page, it still maintains a high printing resistance, generally up to several million prints. (3)Offset printing is to wrap the produced plate on the plate cylinder, so there is always an area on the surface of the plate roller for fixing the plate. Gravure plate is different, because the grav...