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.

但是一次性纸碗是不能长期使用的，因为次性纸碗为了达到隔水效果，会在内壁涂一层聚乙烯隔水膜，聚乙烯是食物加工中安全的化学物质。但如果所选用的材料不好或加工工艺不过关，在聚乙烯热熔或涂抹到纸杯过程中，可能会氧化为羰基化合物。

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.

羰基化合物在常温下不易挥发，但在纸杯倒入热水时，就可能挥发出来，所以人们会闻到有怪味。另外一种隔水物质，蜡，超过40度就会溶于水，长期使用对身体很不利。一些作坊制造的纸杯纸碗看上去洁白干净，实际上，这是因为添加了荧光增白剂；有些一次性纸碗上，甚至能摸得到滑石粉，经常使用这些纸碗，将对人体健康带来危害。

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.