The history of paper cups has gone through four stages.
The paper cups that first came out were cone-shaped, made by hand, glued together, easier to separate, and must be used as soon as possible. The folding paper cups that appeared later added folds on the side walls to increase the strength of the sidewalls and the durability of the paper cups. However, it was more difficult to print patterns on these folded surfaces, and the effect was not satisfactory.
In 1932, the first waxed two-piece paper cup came out. Its smooth surface can be printed with various exquisite patterns to improve the promotional effect. Coating paper cups with wax, on the one hand, can avoid direct contact between the beverage and the paper, and can also protect the adhesiveness of the glue and enhance the durability of the paper cup. On the other hand, the thickness of the sidewall is also increased, so that the strength of the paper cup is greatly improved, thereby reducing the amount of paper necessary for manufacturing a stronger paper cup, and reducing the production cost.
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 cups, and the glue bonding openings will be separated. Therefore, the generally waxed paper cups are not suitable for holding hot beverages.
In order to expand the application range of paper cups, in 1940, straight-walled 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 beverages. Later, the manufacturer applied latex to these cups to cover the cardboard flavor of the paper and to strengthen the leak-proof ness of the paper cups. Single-layer wax-coated cups treated with latex coating are widely used in self-service vending machines to hold hot coffee.
Some food companies began to coat polyethylene on cardboard to increase the barrier and sealing properties of paper packaging. Since the melting point of polyethylene is much higher than wax, the new beverage paper cup coated with this material can be ideally used to hold hot beverages and solves the problem of product quality that is affected by the melting of the coating material. At the same time, the polyethylene paint is smoother than the original wax paint, which improves the appearance of the paper cup. In addition, its processing technology is cheaper and faster than the latex coating method.
As a paper cup manufacturer, Zhejiang Pando EP Technology Co., Ltd. is committed to the production and sales of various types of environmentally friendly paper cups such as Aqueous Coating Paper Cups. For more details, please continue to follow us.