In 1932, the first wax-coated two-piece paper cup came out. Its smooth surface can be printed with various exquisite patterns to improve the promotional effect. Waxing paper cups, on the one hand, can avoid direct contact between the beverage and the paper, and can protect the adhesiveness of the glue and enhance the durability of the paper cup; on the other hand, it also increases the thickness of the side wall, which greatly improves the strength of the paper cup, thereby reducing The amount of paper necessary for making stronger paper cups reduces production costs.
As waxed paper cups become containers for cold beverages, people also hope to use a convenient container to hold hot beverages. However, hot beverages will melt the wax layer on the inner surface of the paper cup, and the glue bonding opening will be separated. Therefore, the general wax-coated paper cups are not suitable for holding hot beverages.