At present, the microwave oven has become an indispensable household main kitchen utensils, all of which are formed by the change of social structure. Since the 1980 s, the whole society has entered a small population family, coupled with the need for rapid development in society, people 's requirements for food production have become simple and fast. In this context, the popularity of microwave ovens in the family has also become a natural phenomenon.
Foods processed by microwave ovens generally use these three methods :
( 1 ) First put the food in the food container, and then put it into the microwave oven to heat. This method is very convenient and feasible for food because its nature is similar to that of steaming food with fire.
( 2 ) Put the food and packaging bags together in the microwave oven for heating treatment. Generally, before the food is put into the microwave oven, the packaging bag is cut and then put into the microwave oven for heating. Here, the tolerance of packaging containers and items in packaging to heat after heating is very critical. Through expert investigation, it is found that although the packaging of foods containing more water is carried out under normal pressure, the properties of foods containing more water will not change greatly in the processing of microwave ovens, but some commodities, such as oily foods, will rise rapidly in a short period of time. Similarly, foods with more sugar will also experience high temperatures, reaching about 150 degrees.
It can be seen that for different internal materials, the temperature change after heating may affect the safety of food containers. This is what we need to pay attention to most. At the same time, it is also concluded that the health problem of food in microwave oven processing does not exist. Now in the food containers on the merchants are marked for the temperature or this kind of food is not suitable for microwave heating and other signs, these are taking into account the processing of temperature changes may cause safety problems, if the customer in accordance with the method to do, food heating, safe food should be no problem.
( 3 ) Food and packaging together with the microwave oven heating container development, is now the main problem to solve the development of packaging materials. First of all, it is necessary to meet the hygiene of food without any problems. Because food will produce water vapor, temperature change and repulsion after heating, how to discharge the generated water and gas while heating becomes important and very necessary. Now all kinds of enterprises have taken measures to devote themselves to the development of this aspect, and have achieved good results.
How to keep good taste and function after food processing has also become an important aspect of microwave oven commodity packaging. The structural performance of this aspect also reflects the progress of packaging materials in the technical field. At present, people see more and more food can be directly used in the processing of microwave ovens, which not only meets the requirements of packaging, but also makes people 's lives greatly convenient. It is believed that the packaging technology of various microwave oven foods will appear in front of people in the future.
