It is currently believed that both N95 masks and medical surgical masks can effectively protect against the new coronavirus when worn correctly and reasonably.
The paper cups currently sold on the market are generally made of single-layer paper in structural design. Generally, the strength of the paper cup is low. After the hot water is filled, the cup body is prone to deformation, and the heat insulation... moreThe paper cups currently sold on the market are generally made of single-layer paper in structural design. Generally, the strength of the paper cup is low. After the hot water is filled, the cup body is prone to deformation, and the heat insulation effect is poor and non-slip, so there is a Double wall paper cup .
The double-layer paper cup, as its name implies, means that the paper cup is double-layered and has two layers. The quality of double-layer paper cups is better than that of single-layer paper cups. The use time of double-layer paper cups is also longer than that of single-layer paper cups. It can also be used to hold hot beverages, such as hot coffee.
To expand the application range of paper cups, straight-walled double-layer paper cups were introduced to the market in 1940. This paper cup is not only easy to carry, but also can hold hot beverages. Later, the manufacturer applied latex to these paper cups to cover the taste of the paper cup material, and to strengthen the leak-proof ness of... less
