In 1932, the first waxed two-piece paper cup came out, and its smooth surface could be printed with a variety of exquisite patterns to improve the promotional effect. Paper cup wax, on the one hand can avoid the beverage and paper direct contact, and can protect the adhesive adhesion, enhance the durability of the paper cup; On the other hand, the thickness of the side wall is also increased, so that the strength of the paper cup is greatly improved, thus reducing the amount of paper necessary for the manufacture of stronger paper cups and reducing the production cost.


In order to expand the scope of application of paper cups, in 1940, straight wall double-layer paper cups were introduced to the market. This paper cup is not only easy to carry, but also can be used to hold hot drinks. Later, manufacturers coated these cups with latex to cover the "cardboard smell" of the paper and strengthen the leak-proof properties of the paper cups. Latex-coated single-layer waxed cups are widely used in self-service vending machines to hold hot coffee.