The aqueous barrier coating on coffee cups refers to a type of coating applied to the surface of the cups. It is a water-based coating that is typically used to enhance the appearance and functionality of the cups.

The aqueous coating serves several purposes:

1. Enhancing visual appeal: The coating gives the cups a glossy and smooth finish, improving their overall aesthetic appearance. It can make the colors and designs on the cups appear more vibrant and attractive.

2. Providing moisture resistance: Coffee cups are often exposed to moisture from the hot beverage they hold. The aqueous coating acts as a barrier to prevent liquid from soaking into the cup's material, helping to maintain the cup's structural integrity and preventing leakage.

3. Improving durability: The coating adds a layer of protection to the cup, making it more resistant to scratches, scuffs, and general wear and tear. This helps to extend the lifespan of the cup and maintain its visual appeal even after repeated use.

4. Ensuring food safety: Aqueous coatings used for coffee cups are typically formulated to be food-grade and non-toxic. They are designed to be in contact with hot beverages without imparting any harmful chemicals or flavors to the drink.

At the same time, water-based coated paper cups are easy to degrade, which is conducive to the protection of the ecological environment and reduce pollution.