Now people are trying to be convenient, which can save some time. People who work in the office building are very easy to eat. They call to order takeout. The general takeout is to use disposable paper bowls to hold food. The material of paper bowls is coated paper, with single coated paper. With double membranes. The price of coated paper is calculated by ton, not by piece, because the paper is thin and thick. The current price is 7200 a ton.

但是一次性紙碗是不能長期使用的，因為次性紙碗為了達到隔水效果，會在內壁涂一層聚乙烯隔水膜，聚乙烯是食物加工中安全的化學物質。但如果所選用的材料不好或加工工藝不過關，在聚乙烯熱熔或涂抹到紙杯過程中，可能會氧化為羰基化合物。

However, disposable paper bowls can not be used for a long time, because secondary paper bowls will be coated with a layer of polyethylene water barrier film on the inner wall in order to achieve water barrier effect. Polyethylene is a safe chemical in food processing. However, if the selected materials are not good or the processing technology is not qualified, the polyethylene may be oxidized to carbonyl compounds during hot melting or coating on the paper cup.

羰基化合物在常溫下不易揮發，但在紙杯倒入熱水時，就可能揮發出來，所以人們會聞到有怪味。另外一種隔水物質，蠟，超過40度就會溶于水，長期使用對身體很不利。一些作坊制造的紙杯紙碗看上去潔白干凈，實際上，這是因為添加了熒光增白劑；有些一次性紙碗上，甚至能摸得到滑石粉，經常使用這些紙碗，將對人體健康帶來危害。

Carbonyl compounds are not easy to volatilize at room temperature, but they may volatilize when pouring hot water into a paper cup, so people will smell strange smell. Another water repellent, wax, will dissolve in water at more than 40 degrees. Long term use is very harmful to the body. The paper cups and bowls made by some workshops look white and clean. In fact, this is due to the addition of fluorescent whitening agent; Some disposable paper bowls can even touch talc powder. Frequent use of these paper bowls will do harm to human health.