The reasons are as follows:

1, the foam snack box will melt during heating, which will affect food heating;

2, the foam snack box will release toxic substances during heating, which is harmful to human body;

3. If a microwave oven has heated the foam snack box, the microwave oven can hardly be used any more.

: microwave oven

Microwave oven (microwave oven/microwave oven), as its name implies, is a modern cooking stove that uses microwave to heat food.

Microwave is an electromagnetic wave. Microwave oven consists of power supply, magnetron, control circuit and cooking cavity. The power supply provides a high voltage of about 4000 volts to the magnetron. Under the excitation of the power supply, the magnetron continuously generates microwaves, which are coupled into the cooking cavity through the waveguide system. There is a rotatable agitator near the entrance of the cooking cavity. Because the agitator is a fan-shaped metal, it can reflect microwaves in all directions after rotating, so it can evenly distribute microwave energy in the cooking cavity, thus heating food.

Microwave oven is a cooking appliance that uses food to absorb microwave energy in microwave field and heat itself. The microwave generated by the microwave generator in the microwave oven establishes a microwave electric field in the microwave oven cavity, and certain measures are taken to make this microwave electric field distributed as evenly as possible in the oven cavity. Food is put into this microwave electric field, and the cooking time and microwave electric field intensity are controlled by the control center to carry out various cooking processes.

Generally speaking, microwave is a kind of high-frequency electromagnetic wave, which does not generate heat by itself. There are microwaves everywhere in the universe and nature, but there are microwaves in nature, so it is impossible to heat food because the dispersion is not concentrated. The microwave oven uses its internal magnetron to convert electric energy into microwave, which penetrates the food at an oscillation frequency of 2450MHz. When the microwave is absorbed by the food, the polar molecules in the food (such as water, fat, protein, sugar, etc.) are attracted to oscillate rapidly at a speed of 2.45 billion times per second. The macroscopic manifestation of this oscillation is that the food is heated.

Simply speaking, the principle of microwave heating is that when microwave is radiated to food, food always contains a certain amount of water, and water is composed of polar molecules (the positive and negative charge centers of molecules do not coincide even when the external electric field does not exist), and the orientation of such polar molecules will change with the microwave field. Due to this movement of polar molecules of water in food. As well as the interaction between adjacent molecules, it produces a phenomenon similar to friction, which makes the water temperature rise, so the temperature of food also rises.

The food heated by microwave is heated at the same time, so that the whole object is heated evenly and the heating rate is fast. It heats the food 5cm deep at a frequency of 2.45 billion times per second, accelerating the molecular operation.

Reference materials; People's Daily Online "Plasticizers interfere with endocrine, beware of health killers in packaging"

Reference link: People's Daily Online "Plasticizers interfere with endocrine, beware of health killers in packaging"