In recent years, UV printers have won unanimous praise from the industry for their environmental protection and high efficiency, and their coverage has grown rapidly. The attractive feature of UV printers is the diversification of its printing materials. The application of inkjet printing technology has expanded from ceramics, glass, metal, acrylic, wood and other materials. However, the adhesion of uv ink on the surface of some smooth materials such as glass and ceramic is not good, and it is easy to fall off. Therefore, it is very important to use a coating to help uv ink adhesion.
UV printer coatings do not appear for a long time, and the quality of the coatings sold on the market is uneven. Low-quality coatings will not only affect the printing effect, but also damage the machine. How to choose the right UV coatings, what aspects should be paid attention to?
Leveling is a common performance indicator in paints. It refers to the ability of a paint to be applied to a surface of an object, such as brush marks and spray mist, which are automatically spread into a flat, smooth surface. A uv coating with poor leveling affects the decorative effect of the printed matter. More importantly, if the brush marks on the surface of the coating do not disappear automatically, the uneven surface of the coating may rub against the UV printer nozzle, causing significant damage. High quality coatings should be formulated to quickly level off after painting or spraying.
For UV printing products, especially for outdoor signs, billboards, printed materials must be bright and new for a long time without fading. Specifically, this requires that the uv coating has a function of resisting ultraviolet rays. Some coatings now turn yellow under long-term lighting conditions and are not suitable for outdoor use. Even for UV-printed products that are used indoors only, it is generally necessary to consider the use of weather-resistant uv coatings to ensure product quality.
As a high value-added decorative product, UV prints generally have high requirements for appearance. This requires that the uv coating film is colorless and transparent. There are some epoxy-based two-component coatings on the market that form yellowing and affect the decorative effect.
This is a question that must be considered. The solvent-based uv coating not only has a large odor, but also poses a safety hazard in the case of improper storage, and is inconvenient to transport. Because of the high investment in UV printers, a safer aqueous uv coating should be considered when choosing a uv coating. If a solvent-based coating is necessary, it is recommended to store it separately from the UV printer to prevent potential safety hazards.
Easy to use:
The uv coatings currently on the market have two-component and multi-component products, and the one-component uv coating that is not required to be configured has a greater advantage in use than the multi-component product.
It is very important that there are many ways to measure adhesion, such as the Baige method. If the quality of the printed product is high, it is also possible to test whether the printed product is immersed in water or the boiled spray surface is peeled off. Adhesion is the key to measuring the quality of a uv coating. High-quality coatings should pass the 100-gram test and do not fall off after soaking in water or boiling water.
Therefore, when purchasing uv coating, it is recommended to choose the UV printer manufacturer to sell or the manufacturer recommended, after all, the quality of the manufacturer is guaranteed.