The gravure printing has a thick ink layer, so the problem of poor drying always exists. The printing feature of gravure printing is wet and wet. Although there is a long drying path, the ink of the previous color group is not dry when the gravure is stacked, but a film is formed on the surface of the ink layer to prevent the next color. The inks of the group reverse the stickiness of the ink of the previous color when the ink is stacked. We would like to tell you the following summarizes the gravure printing products do not dry reasons for your reference; 1. The gravure mesh is deep, sometimes the depth reaches 60μm, the amount of ink is large, and it will be difficult to dry. 2. In order to ensure the transfer of high-gloss small dots, a slow-drying agent must be added in the gravure process, which will also affect the drying effect of the ink. 3. The comprehensive balance of mixed solvents is not easy to grasp, resulting in a large amount of slow-drying agent retention. 4. In some inner printing processes, the last color is printed with white ink, and then it is rolled up. The distance between the drying and the winding station is too short, and the drying is difficult. In addition, the white ink base requires the ink to have good hiding power, and can only thicken the ink layer. In general, the amount of white ink is the largest of all colors. 5. During the printing of pe gravure composite film, the temperature of the drying device must not be too high, and the drying channel should not be too long, otherwise the film will be stretched and deformed, which will affect the overprint accuracy and product length. The commonly used method is to use low temperature and large air volume, and adopt the volatilization method in the drying process to abandon evaporation. 6. Dependence of solvent volatility on environmental conditions. When the ambient air pressure is relatively low, it is difficult to effectively control the drying efficiency with a mechanical exhaust device. 7. There is a boundary layer between the ink layer on the surface of the print and the contact surface with the atmosphere (foreign counterparts call it "Boundarylayer", some people translate it as "mirror film"). This layer contains hot air and solvent vapor. Mixture, the temperature is higher. When the ink is dried under the action of high temperature, the liquid solvent therein will evaporate and move to the boundary layer. If there is no solvent in the boundary layer, the solvent vapor is easily transferred to the atmosphere. However, as the concentration of the solvent vapor in the boundary layer continues to increase, the evaporation ratio of the solvent will decrease. When the solvent vapor in the boundary layer tends to be saturated, the evaporation process will stop. The traditional gravure drying process does not pay attention to the existence of the boundary layer and ignores the role of evaporation in drying. Although the industry has made some improvements to the curv...

On New Year’s Eve, President Xi Jinping delivered a New Year’s message for the year 22 via the China Central Radio and Television Station and the Internet. The full text is as follows: Looking back on this year, it makes a lot of sense. We have personally witnessed major events of milestone significance in the history of the party and the country. At the intersection of the "two centenary" struggle goals, we have embarked on a new journey of building a socialist modern country in an all-round way, and we are marching on the road to the great rejuvenation of the Chinese nation with our heads high. From the beginning of the year to the end of the year, farmland, enterprises, communities, schools, hospitals, military camps, scientific research institutes...Everyone has been busy for a whole year. They paid, contributed, and reaped. In the fleeting time, the China we have seen and felt is a persistent and prosperous China. There are amiable and respectable people, rapid development, and continuous inheritance. The greatness of a big country also has the weight of a big country. Thousands of things, after all, are the affairs of thousands of households. I have researched some places, read and listened to many situations, which is very enlightening and rewarding. Whenever I go to the homes of the masses, I often ask if there are any difficulties. I remember the words of my fathers and villagers in my heart. I will read what the people worry about; I will do what the people hope. I also came from the countryside and have a personal experience of poverty. Through continuous efforts from generation to generation, people who were previously impoverished can now eat their stomachs, wear warm clothes, go to school, have housing, and have medical insurance. A well-off society in an all-round way and poverty alleviation are our party’s account to the people and a contribution to the world. For everyone to live a better life, we can't be satisfied with the results before us, and there is still a long way to go. Anlan of the Yellow River is the millennium aspiration of the Chinese people. In recent years, I have traveled to 9 provinces in the upper, middle and lower reaches of the Yellow River. Whether it is the "Mother River" of the Yellow River and the Yangtze River, the rippling Qinghai Lake and the majestic Yarlung Zangbo River; whether it is the Century Project of the South-to-North Water Diversion Project, or the "green map" of the Saihanba Forest Farm; whether it is the Yunnan elephant going north to the south, or Tibetan antelopes multiply and migrate...These all show that people will live up to the green hills, and the green hills will surely live up to others. This year, there are still many unforgettable Chinese voices, Chinese moments, and Chinese stories. The youth vow of "please rest assured of the party and strengthen the country", the affectionate confession of "clear love, only for China"; "Zhu Rong" to explore the fire, "Xihe" to travel by the ...

Benzophenone is a colorless prismatic crystal with sweet taste and rose fragrance. It has a melting point of 47-49°C, a relative density of 1.1146, and a refractive index of 1.6077. It is soluble in organic solvents and monomers such as ethanol, ether and chloroform, but insoluble in water. Specification: Item           Specification             Appearance           White flake Purity              99.5%min Melting Point                  47.5-49.0 Low Boilers            0.1%max High Boilers            0.2%max Usage: Benzophenone is widely used as a photoinitiator for inks and varnishes that are cured with UV light. In addition to being a drying catalyst, benzophenone is an excellent wetting agent for pigments; it can also be used in printing to improve the rheological properties and increase the flow of inks by acting as a reactive solvent. Benzophenone can also be added to plastic packaging as a UV blocker to prevent photo-degradation of the packaging polymers or its contents. Its use allows manufacturers to package the product in clear glass or plastic (such as a PETE water bottle). Without it, opaque or dark packaging would be required.

Factors affecting fastness to adhesion as follows: 1. The influence of ink resin system Resin is an important part of the ink, its important role is first as a carrier of pigment, powder pigments, fillers and other solid substances mixed together, followed by making the ink on the substrate drying, consolidation film, resin system is one of the key components affecting the ink on the substrate adhesion fastness. For plastic packaging and printing of BOPP, PET, NY, etc are the main types of backing material, base material of different molecular structure is different also, in order to obtain good ink adhesion fastness, printing ink resins with the base material has good affinity, general printing production process of polypropylene (PP) film using chlorinated polypropylene resin type of ink, printing of polyester (PET) Film will use polyurethane ink, although now with the development of ink technology, suitable for BOPP, PET, NY and other substrates of universal ink has begun to use, but in actual use still need to effectively identify the type of ink, misuse of ink or ink from different manufacturers will cause poor quality accidents of ink adhesion fastness. 2. Influence of pigment dispersion Paint as a carrier of the ink color, mostly small molecule organic matter or inorganic matter, not directly with printed substrate to form effective adhesion, therefore can only put the pigment shattered into small, uniform particles, evenly distributed to the resin, resin on the surface of pigment wetting and package, so as to get a stable suspension system; The dispersion of pigments, in addition to directly affect the ink itself viscosity, gloss, stability, fineness, coloring power and covering power, ink adhesion also has a great impact. Good dispersion system, as well as to achieve the best pigment fineness also make the package more resin for small pigment particles in good condition, after fixation into a film in the plastic substrate surface, forming uniform package resin film pigment particles, increase the resin with plastic film on the surface of the contact area, to improve fastness. 3. Influence of solvent Solvent-based inks are mostly used in plastic gravure printing. As an essential organic solvent in the ink system, it also has a great impact on the fastness of ink to adhesion on the surface of plastic substrate. 1) The solvent volatilization of printing ink affects the fastness of printing ink Production needs to adapt ink to printing, printing ink resin's ability to release organic solvent and solvent volatilization speed directly affect the ink attachment fastness, volatile solvent good its solvent release better than the volatile solvent with a slower, but the high proportion of high volatile solvent will lead to ink surface drying too quickly, and the inner solvent release impeded, dry incomplete, in actual life In the process of production, it is necessary to add an appropriate amount of slow drying solvent or medium slow drying solven...