• Jan 20, 2022 General Information about Screen Printing Plastisol Inks
    Plastisol ink is a PVC (polyvinyl chloride) based system that essentially contains no solvent at all. Along with UV ink used in graphic screen printing, it is referred to as a 100% solid ink system. Plastisol is a thermoplastic ink in that it is necessary to heat the printed ink film to a temperature high enough to cause the molecules of PVC resin and plasticizer to cross-link and thereby solidify, or cure. The temperature at which most plastisol for textile printing cures at is in the range of 149 °C to 166 °C (300 °F to 330°F). Plastisol ink can be printed on many items that can withstand the heat required to cure the ink and is porous enough to permit good ink adhesion. They do not dye the threads of a fabric like traditional dye material. Plastisol screen printing ink wraps around the fibers and makes a mechanical bond with the fabric. Screen printing plastisols will not adhere to non-porous substrates such as plastic, metal, wood and glass. They also will not adhere to water-proof nylon material without adding a bonding agent/catalyst. Plastisol ink is made up PVC particles suspended in a liquid plasticizer, it is very durable, flexible, and is commonly used in apparel printing. Plastisol is thick and opaque and it can be mixed easily to create just about any color imaginable. With plastisol ink, we can create special effects like suede, glow-in-the-dark, glitter, shimmer, or metallic. Plastisol is most commonly used on dark-colored fabrics, and it is ideal when printing designs that are less detailed and very colorful. The four major components that go into the formulation of Plastisol inks are (1)Polyvinyl Chloride (PVC)  (2)Plasticizers  (3)Fillers  (4) pigments. Additives A word of caution about ink additives, it’s easy to upset the chemical balance of plastisol inks by using the wrong additives, or by adding too much of an additive – even if it is the correct type of additive. The result can be t-shirt ink that never cures properly, a problem that may not be discovered until your customer washes a shirt and the design falls (i.e. color lose, adhesion or cracking). To avoid this problem, use only those additives recommended by the manufacturer, and read the Technical Data Sheets for each ink and additive, and carefully follow their instructions. Never add mineral spirits to plastisol ink. Although mineral spirits will make it easier to print at first, soon the ink will become even stiffer and harder to print than before. Also, it is possible that mineral spirits will prevent the ink from curing properly. Ink Storage Store plastisol inks at room temperature. Prolonged exposure to temperatures above 90º F (32º C) can cause the ink to start to cure while it's still in the container.
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  • Jan 11, 2022 What factors affect the printing products of gravure printing don't dry?
    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...
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  • Dec 31, 2021 President Xi Jinping delivers a new year message for 2022
    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 ...
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  • Dec 17, 2021 What is benzophenone used for?
    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.
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