In recent years, due to the country’s strict environmental inspections, many silk screen manufacturers have been greatly affected. Therefore, the UV flatbed printers with environmentally friendly printing, fast and high-quality have been widely praised, and their coverage has grown rapidly. The biggest highlight is the diversification of its printing media, so it is also called a universal printer. In the past few years, it was still very limited. It can not be printed on glass, ceramics, metal, acrylic, wood, and other materials, but now UV flatbed printers can achieve a High-quality color printing effect. However, UV ink has poor adhesion on glass, ceramic, metal, acrylic, and some smooth wood surfaces, and it is easy to fall off. Therefore, the use of flatbed printer coating to help UV ink adhesion is a very important process.
However, the appearance of UV flatbed printer coatings is not long, and the quality of coatings sold on the market is uneven. Inferior coatings not only damage the quality of printed products but also damage the machine. How to correctly choose the coating for UV flatbed printers is the information I want to share with you below. You need to pay attention to the following 6 aspects:
First, adhesion
There are many ways to measure adhesion, such as the hundred grid method. If the quality requirements of the printed product are high, you can also test whether the printed product is immersed in water or whether the surface of the boiled spray paint falls off. Adhesion is the key to measuring the quality of UV flatbed printer coating. A high-quality coating should pass the 100 grid test and will not fall off after being soaked or boiled.
Second, leveling
leveling is a common performance index in coatings, which refers to the automatic flow development of the paint film, such as brush marks and spray mist particles when the paint is brushed or sprayed on the surface of the object. The ability to flat and smooth surfaces. The UV flatbed printer coating with poor leveling will affect the decorative effect of the printed matter. More importantly, if the brush marks on the coating surface will not disappear automatically, the uneven coating surface may rub the UV flatbed printer nozzle, causing huge loss. A high-quality coating should be well formulated and level off quickly after brushing or spraying.
Third, the transparency of film formation
As a high-value-added decorative product, the requirements for appearance are generally very high. This requires UV flatbed printer coating to be colorless and transparent. At present, there are some two-component coatings based on epoxy resin on the market that form yellowish films, which affect the decorative effect.
Fourth, weather resistance
UV printing products, especially signs, billboards, and printed materials used outdoors must be bright as new for a long time without fading. Specifically, this requires that the UV flatbed printer coating has the function of resisting ultraviolet rays. Some coatings now turn yellow under long-term light conditions and are not suitable for outdoor use. Even UV printing products that are only used indoors, generally need to consider the use of weather-resistant UV flatbed printer coatings to ensure product quality.
Fifth, product safety
This is an issue that must be considered. The solvent-based UV flatbed printer coating not only has a strong smell, but also causes safety hazards when improperly stored, and is inconvenient to transport. Because of the high investment in UV flatbed printers, it is best to consider safe water-based UV flatbed printer coatings when choosing UV printer coatings. If solvent-based coating must be used, it is recommended to store it separately from the UV printer to prevent safety hazards.
The coatings of different material configurations are also different. At the same time, the performance of the ink should be considered. Common coatings include metal coating, ABS coating, leather coating, silicone coating, glass coating, PP coating, etc. It is these six types, so the adhesion is good or not, and the choice of coating is also very important.
