China Railway began to use foamed tableware from 1986, but it was forbidden to produce because of environmental pollution. Soon after, it was lifted because the foamed tableware failed to prove toxic, the price was close to the people and the social demand was met. Because the foamed lunch box is fragile and easy to tear, it can't meet all kinds of food packaging needs, so plastic tableware has appeared, among which PP lunch box is the representative, which is strong, tough and non-toxic and can be heated by microwave oven, so it is widely used. However, for developed countries with growing awareness of environmental protection, PP tableware can no longer meet their requirements, so it is necessary to use tableware that conforms to their national regulations: degradable tableware, which naturally returns to nature. The first three types are not completely sealed. Aviation meals are prepared in advance to be heated on the plane, which requires sealing, water tightness and convenient transportation, so there are thickened aluminum foil lunch boxes (reusable and recyclable).

As the saying goes, where there is demand, there is a market. When people's demand is increasing, new products will appear to meet the demand, which is development.