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At present, environmental-friendly high-temperature (121°C to 150°C) screen printing ink has become the focus of attention in packaging and printing. The so-called environmentally-friendly high-temperature screen printing ink is the surface of the packaging product that has been completed in the graphic screen printing process, so that the printing ink layer can be adapted to the heat-resistant water-soluble ink layer, and has a certain resistance to water, playing a role Substrate compatible with environmental protection, decorative role of ink.
Screen printing of environmentally friendly high-temperature inks will not change their process procedures due to environmental protection and high temperature resistance. However, it is characterized by diluting and adjusting the ink with pure water, especially when the printed product is subjected to a certain high temperature, the ink film of the printing ink will improve the attachment fastness, so that the ink film will not be softened due to the heat of the environment. Adhesion caused by the defective or even scrapped. According to the needs of the user and the actual printing process, the product can be used for different screen printing processes. For this reason, the author focuses on the formula design and application scope of the product.
Water-based high temperature screen printing ink features
Water-based high-temperature screen printing inks are non-toxic, odorless, organic solvent-free volatiles, low cost, broad sources of materials, good gloss, resistance to leaching, heat, abrasion resistance, water washability, economic health, etc. Features.
Water-based heat-resistant screen printing inks can be classified into three types: high gloss, ordinary gloss and matt, depending on the application of the product. From the screen technology can be divided into: manual screen printing and rotary screen rotary screen printing two types. Water-based screen printing high-temperature ink can eliminate the harm to the human body and the pollution to the environment in the process of use, and has begun to be valued by packaging and printing companies such as food, artificial leather and bags.
In addition to environmental protection, screen-printed high-temperature inks also have the following advantages over solvent-based screen printing inks:
1. Heat and washable. The ink is usually resistant to 121 °C ~ 150 °C, to provide an operational platform for some special packaging and printing products. In particular, inks in the past tend to cause sticking or sticking and whitening due to an increase in ambient temperature or humidity. In particular, artificial leather products in the post-print coating and other processes often cause the ink ink film to become soft, deformed, and migrate to cause the product to be scrapped. Second, because the ink film is not resistant to washing during the printing and dyeing process even during use, it causes discoloration and discoloration. The environment-friendly high-temperature screen-printing ink is generally cured by high temperature, and the degree of branching of the graphic ink film is enhanced to enhance the water resistance of the product.
2. High transparency. Substrate is bright and can be stored on prints for a long period of time. Under strong sunlight, yellowing, discoloration and fading are not easy.
3. Strong wear resistance. Packaging and printing jewelry need a strong abrasion resistance, measured in 50 pressures per square centimeter, generally should reach 150 rubs per minute; general brightness, can reach 50 to 70 brightness units. Therefore, the packaged silk screen product not only has to be wear-resistant and resistant to 30 minutes, 8 days, but also up to 121 DEG C. to 150 DEG C. (3 seconds to 10 seconds) to meet this requirement.
4. After printing, the film formation speed is fast and dry quickly. The drying process of water-based high temperature resistant silk screen printing ink is 60% by evaporation or volatilization, 40% is absorbed by the material, and the drying is rapid. The graphic conjunctiva of the printing ink can be completed in about several minutes or tens of minutes. If you use infrared or hot air drying method can promote its film drying.
5. It is convenient and safe to use and store, which is conducive to safe production and improving the working conditions of operating staff. Since solvent-based or oil-based screen printing inks are dangerous goods, transportation, storage and use are quite inconvenient. The environmentally friendly high-temperature water-based screen printing ink uses water as a solvent without any danger. It is safe and reliable to use, and it can be used to clean the equipment and clean the fingers with water.
6. Non-toxic and tasteless. Since water-based screen printing ink uses water as a solvent, and a small amount of volatile edible alcohol as auxiliary solvent, it is particularly suitable for use in food, clothing, artificial leather and plastic substrates.
7. High temperature resistance and heat sealability. Water-based screen printing inks have good heat-sealing properties, and even if PE and PVC are used, good heat sealing effect can be obtained.
8. The finished product has good leveling and anti-curling ability. One of the troubling problems in printing is the continuous drying of substrates through several color groups. PVC with extremely low moisture content or lateral shrinkage or longitudinal shrinkage of the substrate tends to curl, making it impossible to produce or use it normally. The ink product can maintain good flatness and curl resistance after printing, decoration, bronzing, and slitting.
9. The price is reasonable. At present, the market price of water-based screen printing ink is generally lower than that of solvent-based screen printing ink by about 30%, which provides a price advantage for expanding market share.
In addition to the above-mentioned advantages, the high-temperature water-resistant screen printing ink is used on a rotary screen rotary machine, and the operation method is almost the same as that of a conventional solvent-based screen printing ink. But the focus is on the product's pH value control, viscosity, drying, silk screen number selection, oven or drying temperature control, and under wet printing conditions, the ink may not have been fully dried and it has been pulled down or contaminated sequence. In particular, how to extend the drying time will become the focus of the packaging and printing industry. On the other hand, it can also be applied to a flexographic rotary printing machine.
To sum up, the product has the advantages of advanced technology, convenient use, economic health, non-toxic and non-polluting, and has the potential to be popularized.
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