Flexo is a flexible, high resolution, warped letterpress plate. In recent years, flexo printing has developed rapidly in the field of printing, and its development prospects are generally optimistic. Flexographic printing presses transfer the right amount of ink to the substrate through a unique mesh roller. The appropriate use of ink is directly related to the printing production operation and printing quality, the general flexographic printing ink used is very thin, belongs to the liquid ink, from the rheological point of view is a close to Newton fluid ink, with good fluidity, viscosity is only 0.1-1Pa/s. At present, three types of inks are mainly used in flexographic printing: organic solvent inks, water-based inks and ultraviolet curing inks. Among them, water-based ink has always been a large part of flexographic printing for its environmental protection, economy and other advantages. This paper mainly discusses the printability of water-based ink and its use in flexo printing. 1.Composition and characteristics of water-based ink Like the general printing ink composition, water-based ink usually also has colorant, binder, auxiliary agent and other components. Colorant is the color substance of water-based ink, giving the ink a specific color. In order to make the printing color gorgeous, the colorant is generally selected with good chemical stability and high coloring power. The binder consists of water, resins, amines and other organic solvents. Resin is the most important component of water-based ink, usually the use of water-soluble acrylic resin, binder composition directly affects the ink adhesion function, drying speed, anti-sticky performance, etc., but also affects the ink gloss and ink transfer, amine compounds mainly maintain the alkaline PH value of water-based ink, so that acrylic resin to provide better printing effect. Water or other organic solvents are mainly dissolved resins, adjust the viscosity of the ink and drying speed; Auxiliary agents mainly include: defoamer, blocker, stabilizer, diluent and so on. Since water-based ink is a soap composition, it is easy to produce bubbles during use, so silicone oil should be added as a defoamer to inhibit and eliminate bubbles, while improving the transfer performance of the ink. The blocking agent is used to inhibit the drying speed of the water-based ink, prevent the ink from drying on the roller and reduce the paste plate. The stabilizer can adjust the PH value of the ink, and can also be used as a diluent to reduce the viscosity of the ink. Diluent is used to reduce the color of fresh water ink, and can also be used as a brightening agent to improve the brightness of water-based ink. In addition, some wax should be added to the water-based ink to increase its wear resistance. 2.The PH value of water-based ink The PH value of water-based ink is directly related to the viscosity, dryness and other printability of water-based ink. The experiment shows that the viscosity of water-b...

First, resin reaction temperature standard The reaction temperature of resin is an important process parameter, which has great influence on the reaction rate, physical properties and chemical stability of resin. In general, the resin reaction temperature should be determined according to different resin types and catalyst types. The following are some commonly used resin reaction temperature standards: 1.Phenolic resin: usually reacts around 150°C. 2.Epoxy resin: The commonly used reaction temperature is 80-140°C. 3.Polyurethane resin: the reaction temperature is generally 60-120°C. 4.Unsaturated amino resin: the reaction temperature is between 20-80°C. Second, the factors affecting the resin reaction temperature In addition to the type of resin and the type of catalyst, there are other factors that affect the reaction temperature of the resin. Here are some common contributing factors: 1.Resin types: Different resin types have different temperature requirements, and for some resins with good heat resistance, such as epoxy resins, the temperature requirements are relatively high. 2.Catalyst: Different catalysts have different requirements for different resin reaction temperatures. For example, some catalysts need to react at higher temperatures to function, while others need lower temperatures. 3.Filler: In the resin reaction, although the filler can not undergo chemical reaction, it will also affect the reaction rate and temperature requirements. 4.pH value of the reaction system: Different pH values will affect the reaction temperature. Third, resin reaction temperature adjustment methods and precautions In the resin reaction, temperature regulation is a very important link. The specific adjustment methods and precautions are as follows: 1.Select the catalyst reasonably, and determine the best reaction temperature according to the nature of the catalyst and the type of resin. 2.Control the quality and particle size of the filler so as not to affect the mass transfer rate of the reaction system. 3. Properly adjust the pH value of the reaction system. 4.Control the solution concentration of the reaction system to avoid overheating due to high concentration. In short, it is very important to choose a reasonable reaction temperature in resin reaction. According to the different resin and catalyst types, we can determine a more reasonable reaction temperature. At the same time, it is also necessary to pay attention to the above adjustment methods and precautions in the reaction process to ensure the effectiveness and stability of the reaction.

The main reason for water-based ink drying 1.Water-based ink: water-based carton ink, non-woven ink, paper towels, paper cups and paper bags and other packaging printing; 2.Water-based polishing oil series: water-based polishing oil, polishing oil, high gloss, wear-resistant, matte, waterproof, antifreeze and other environmental protection water-based products. Water-based ink drying is mainly caused by the following reasons: Water-based ink drying is mainly caused by the following reasons: 1.The old version was not cleaned when printing. 2.The solvent drying speed is too fast (printing speed and solvent volatilization speed does not match). 3.Dry hot air blowing to the layout. 4.When there is dust, moisture, bubbles and other impurities curing in the contact point between the scraper and the printing ink, the transfer rate of the ink will be reduced due to the decrease in the actual amount of ink in the net hole, and some thicker particles will even be embedded in the net hole. 5.The precision and Angle of electric carving of the mesh hole will also affect the plate making 6.The transfer to the ink, resulting in insufficient or lost outlets. 7.The quality of ink and solvent is also one of the reasons for blocking plate, if the fluidity of the ink is not good, the printing viscosity is too high, the ink has deteriorated or mixed with different series of ink, the use of inappropriate solvent or solvent ratio, and even the improper operation of adding solvent with ink will affect the transfer of ink, resulting in blocking plate. Sinograce Chemical production ink water-based resin, welcome to buy.

First. Application of paper coating Paper coating is mainly used in packaging printing, book printing, poster printing and other fields, which can improve the gloss of paper, waterproof, oil-proof, wear-resistant, anti-folding and other functions. The paper coating can not only improve the quality of the paper, but also enhance the durability, stability and aesthetics of the paper, and is also a solution to meet the needs of environmental protection. Second, the characteristics of paper coating materials 1.Polyethylene: polyethylene has excellent waterproof, oil-proof and moisture-proof properties, so it is often used in paper products that need to be waterproof and oil-proof. Polyethylene coating can be used for imitation copper paper, gold-plated paper, coated paper, etc., beautiful effect is good, and long life. 2.Polyurethane: The use of polyurethane is very wide, it has applications in different fields, such as packaging materials, electronic materials, building materials and so on. Polyurethane coated paper not only has excellent mechanical properties and touch, but also has low friction, anti-static, excellent oil resistance and water resistance and many other advantages. 3.Polypropylene: polypropylene moisture-proof, waterproof, oil-proof performance is good, so that it is widely used in packaging materials, office stationery, building insulation and other fields. Polypropylene coated paper is light in texture, easy to process and carry, and can also protect against moisture, water, oil and sun. Third, the role of paper coating 1.Improve the beauty of the paper: the surface of the paper coating is smooth, high gloss, and has a good color reduction and printing effect. This is critical in areas such as book and poster printing. 2.Enhance the durability of the paper: After the paper coating, the hardness, wear resistance, folding strength and other properties of the paper have been greatly improved, which enhances the strength and stability of the paper, and also extends the life of the paper 3.Improve packaging quality: After the paper coating, the toughness of the package increases, making the package more firm. At the same time, the paper coating makes the packaging material have higher moisture, water, oil, folding and other properties, and better protect the quality and safety of the internal items. In summary, paper coating is a special material that can improve the characteristics, aesthetics and protection of paper, and has a wide range of applications, and its commonly used coating materials include polyethylene, polyurethane, polypropylene and so on. Coated paper has better durability and other properties, which plays an important role in packaging, printing and building materials. Sinograce Chemical produces all kinds of water-based coatings for paper, top coating and primer, and various additives and viscosifying emulsions.