In fact, disposable paper cups are harmless, but they can't be used often. Before buying disposable paper cups, we should first understand the scope of application of paper cups, whether they are suitable for cold drinks or hot drinks. There are three kinds of disposable paper cups on the market. One is made of white cardboard, which is mainly used to hold popcorn, fried chicken and other dry goods.

The second kind of wax paper cup has a layer of paraffin wax on the inner wall, which can be waterproof and can be used to hold frozen drinks or carbonated drinks, but the holding temperature should not exceed 40 degrees. The third is a paper-plastic cup, which is a layer of paper on the outer wall of the cup and a layer of polyethylene or polypropylene coated paper on the inner wall. It can be used for both cold drinks and hot drinks.

Although disposable paper cups are harmless to the body, it is not recommended to put too hot water in them. In addition, you can't use it for the second time, and throw it away after use. Some inferior paper cups contain bleach and fluorescent powder, which has certain toxicity. So watch carefully before buying paper cups.

The shelf life of disposable paper cups is about three years. If it is not sealed after unpacking, the shelf life will be shorter. Disposable paper cups are breathable, so when we fill them with water, there won't be much change. However, if you drink water and tea in a paper cup for a long time, you will find that the white seam inside the paper cup has changed color and has obvious permeability, which is not suitable for long-term use.