Water-based coating is an effective means to process the surface of printed matter, to improve the gloss and strength of the surface of printed matter, enhance the aesthetic effect, temperature resistance, water resistance, wear resistance, improve the grade of printed matter and commodity value. Therefore, to measure the quality of the coating, it is also necessary to examine the brightness, strength, adhesion and other aspects of the coating. Water-based coating is an effective means to process figures on the surface of printed matter, to improve the gloss and strength of printed matter surface, enhance the aesthetic effect, temperature resistance, water resistance, wear resistance, improve the grade of printed matter and commodity value, so to measure the quality of the film Fuji Star, also need to examine the brightness, strength, adhesion and other aspects of the film. The development of water-based laminating machine makes the water-based laminating process widely promoted and applied. Water-based wet laminating is favored by the majority of customers for its high strength, high grade, easy recovery, no pollution and other characteristics of laminating printed matter. Water-based film coating process has just been promoted, because customers do not know much about this process, more concerns about film, afraid of problems, in view of this, had done a lot of tests for customers in advance, such as:  in order to test the combined printing of water-coated printed matter with temperature resistance, humidity resistance and oil resistance, has done the relevant film coating test in the early use of the machine, whether temperature resistance, humidity resistance and oil resistance, can meet the requirements of the film coating products. Laminating process is more complex, in normal production still need to pay attention to the following problems:Powder printing Print product dusting Because water-based glue can dissolve powder on the surface of printed matter, so when the coated product snowflake point when the post-press process, it will feel incomprehensible, in fact, the reason is very simple, water-based glue itself is also limited by solubility, if the printing powder is too large, the excess part can not be completely dissolved by glue plate making, there will be a large area of snow. There are three ways to deal with this situation: 1. Coordinate the upper and lower processes to minimize the amount of powder spraying during printing 2. The amount of glue water should be increased appropriately to increase the ability of the glue to dissolve the powder; Digital printing post-press processing 3. Clean the surface of the printed matter with suspended powder spraying before coating Clean Due to the water-based coating adhesive drying quickly, if static no flow, will dry into rubber equipment maintenance and maintenance, into a solid block. If attached to the rubber roll or pressure roll, it will cause local glue is too small, or pre...

Polyurethane (PU) is a kind of organic polymeric compounds containing repeated carbamate group (NHCOO) in the main chain.Polyurethane polymer materials have the advantages of wear resistance, high temperature resistance, good adhesion, easy processing, low price, but some polyurethane water resistance, heat resistance is poor, need to be modified by specific methods, in order to achieve the purpose of optimization.Waterborne polyurethane (WPU) uses water as the dispersion medium, avoiding the traditional organic solvents serious pollution, harm to human health and other shortcomings, at the same time save a lot of organic solvents, greatly reducing the cost. With the continuous improvement of people's environmental awareness, environmental protection laws and regulations are becoming more and more perfect. Waterborne polyurethane has become a hot topic. Based on its advantages of non-combustible, high safety and easy modification, it is widely used in coatings, adhesives, fabric finishing agents and coating agents. ① Water-based polyurethane coating completely or basically contains no solvent, no odor, no pollution, has the advantages of non-combustible, low cost, can be diluted directly with water when using, easy to use, easy to clean. ②The viscosity of waterborne polyurethane does not vary significantly with the change of polymer relative molecular weight. High molecular weight waterborne polyurethane can be prepared at low viscosity, which is very favorable for improving the cohesion strength of resin. The viscosity of solvent-based polymers increased exponentially with the increase of molecular weight, and gels were easily produced when the molecular weight was larger. ③The viscosity of waterborne polyurethane is generally lower than that of solvent type. The smaller the dispersion diameter of waterborne polyurethane is, the greater the viscosity is. The viscosity of solvent-based polyurethane increases obviously with the increase of solid content. The viscosity of solvent-based polymer can be adjusted by controlling solid content or solvent amount, while the viscosity of waterborne polyurethane needs to be adjusted by thickening agent. ④Water-based polyurethane has good compatibility with a variety of water-based resins, and can be mixed to improve performance or reduce cost. It is necessary to select water-based resins that match the charge properties and acid-base of ionic waterborne polyurethane, otherwise condensation may occur. Due to the compatibility of polymers and the solubility of resins in solvents, solvent-based polyurethanes can not be blended with other resins. Compared with organic solvent polyurethane coatings, waterborne polyurethane coatings have the advantages of low application cost, pollution-free, easy handling and good bonding effect. It has a good development prospect in adhesives and coatings industry. Therefore, according to the statistical data, it is predicted that the domestic consumption of water-based pol...

① BOPP/VMCPP The composite structure is mainly used in light food packaging such as instant noodles, egg yolk pie and snow cake. The composite structure is the most suitable for one component water-based adhesive. Compared with solvent-based polyurethane adhesive, the single group of water-dispensing adhesive has less ink transfer phenomenon, high initial adhesion, no need for curing, and can be directly cut bag making process. ② BOPP/CPP This structure is more suitable for the combination of two groups of water glue, the bonding strength of one group of water glue can not meet the requirements of use. The structure is also mainly used in bread, cake and other packaging. ③ PET/VMCPP This kind of structure is mainly used in candy and back-sealed rice cake packaging. This structure is more suitable for single group of water glue, which can effectively control the transfer phenomenon of aluminum plating and meet the requirements of high speed packaging. ④ PET(BOPP)/VMPET/PE The structure of two composite can be used water-based adhesive. The outer layer composite can effectively reduce the transfer of aluminum plating and provide sufficient bonding strength. The inner composite can effectively avoid the friction coefficient on the bag making effect. ⑤ PA/PE、PET/PE和BOPP/PE The above three structures are more suitable for the use of two-component water-based adhesive. Due to the water-based adhesive good low temperature resistance characteristics. Can make the above three structures in frozen food packaging (frozen dumplings, ice cream, etc.), effectively reduce the brittleness of packaging materials under freezing conditions, improve the heat sealing strength under low temperature conditions. Sinograce Chemical's glue bonding solution In view of the above variety of water-based adhesive application structure, Sinograce Chemical company has developed single-component water-based adhesive series and high-performance two-component water-based adhesive series products, which can provide our customers with a variety of bonding solutions. At present, our company's single and two component water-based adhesive has been put on the market, the market feedback is good, the performance is excellent, fully able to meet the complex needs of customers of various packaging structures.

Water-based adhesive with high polymer, water-soluble resin as the main raw materials, water as the solvent, less odor, environmental protection. With the continuous improvement of people's environmental awareness, water-based adhesives have become the mainstream of the market in recent years. Characteristics of water-based adhesive 1.Applicable to the substrate any kind of adhesive is not omnipotent, a adhesive is only suitable for bonding a certain or a class of specific materials. At present, water-based adhesive is mainly used for polishing paper/paper, PET/paper, BOPP/paper, PVC/paper, plastic/plastic and other substrate bonding. 2.Inherent characteristics Each water-based adhesive has its own "intrinsic properties". The inherent characteristics of water-based adhesives mainly include appearance (product appearance and film appearance), solid content, density, pH value, solvent ratio, opening time, high/low temperature resistance, initial viscosity, curing viscosity, etc. The bonding modes of water-based adhesives are generally divided into three types: machine adhesive, hand adhesive, machine adhesive and hand adhesive. Different bonding modes correspond to different inherent characteristics. For example, when mechanical adhesives are used, the opening time of water-based adhesives is required to be short; When using hand adhesive, the water-based adhesive is required to open for a long time. In terms of high/low temperature resistance, the water-based adhesive is required to bake for 72 hours in a safe range, and then after freezing for 72 hours, the bond strength remains unchanged, without degumming, brittle film and other phenomena. Pay attention to the use of sealant adhesive 1.The operating temperature of water-based sealing adhesive should be above 0 degrees. Otherwise, icing will damage the adhesive performance and even cannot be used. 2.Beware of splashing into the eyes and mouth. If accidentally entered, rinse immediately with clean water; 3.Do not add water in the process of use 4.Do not pour the waste liquid directly into the sewer or river, the remaining residue can be static dry film after solid waste treatment; 5.Storage of water-based sealant generally choose cool, dry and temperature above 0 degrees environment, shelf life is generally 6 months; 6.Screw on the packaging cover of products that are not used up in storage after use to prevent drying out.