Lunch box is a kind of box specially used to hold food, also called lunch box. There are five kinds of lunch boxes: microwave lunch boxes, insulated lunch boxes, plastic lunch boxes, disposable lunch boxes, electric lunch boxes and folding lunch boxes. Many office workers will choose to put the prepared lunch in the lunch box and eat it in the microwave oven in the company. However, it should be noted that stainless steel lunch boxes cannot be heated by microwaves, because metals cannot absorb microwaves, and improper use may even cause explosions. In addition, plastic lunch boxes and lacquer lunch boxes are not suitable for microwave heating. Let's look at the detailed knowledge introduction. What kinds of lunch boxes are there?

1, microwave lunch box

The texture is thick and solid, and the service temperature is 140℃- MINUS 30℃. It can be cooked in a microwave oven or stored in a freezer at low temperature. The box is generally glass-colored, clear and transparent. The lunch box has a built-in small steaming rack, which provides convenience for steaming noodle products, and has the function of dripping water to keep the original flavor of food, so as to heat oily food without water.

2, insulated lunch box

Lunch boxes that can keep the temperature of meals can be divided into several types, such as stainless steel liners and tempered glass liners. Different materials have different thermal insulation properties. Vacuum heat preservation can be 10 hour, and heat preservation and cold preservation can be 24 hours. Military lunch box is a professional lunch box used by troops in marching and fighting. Generally light and small, not easy to rust, strong plasticity, can avoid knocking on the body; Aluminum products can be used as pots in extraordinary times, and also have the function of portability and portability. Aluminum products are light in weight, reduce load, generally thin in texture, fast in heat conduction and fuel saving. Compared with military metal and steel products, it has low cost and is suitable for large equipment.

3. Plastic lunch boxes

A lunch box made of plastic. The raw materials of plastic lunch boxes cause minerals and additives added in the lunch boxes to dissolve with water, vinegar and oil contained in food, so it is easy to produce odor.

4. Disposable lunch box

Disposable lunch box made of foamed plastic. Also called white lunch box. It uses freon as foaming agent and polystyrene as raw material. Freon is an ozone depleting substance, which will lead to ozone holes in the atmosphere. Polystyrene is a carcinogen, which will cause reproductive dysfunction. In the process of use, when the temperature exceeds 65 degrees Celsius, some toxins and dioxins will be produced. Dioxin is a toxic chlorine-containing compound. Dioxin is the most toxic and carcinogenic compound in the world, which can cause serious skin diseases and damage to the fetus, and may also lead to feminization of men. Harmful, not recommended.

5, electric lunch box

It is a new type of portable lunch box, which is based on the insulated lunch box, made of heating materials and connected by electric connecting wires. Put the food to be eaten into the lunch box, measure a cup (about 50g) of drinking water with a small measuring cup, put it into the food box, insert the upper cover tightly with the power supply, turn on the heating indicator for 30 minutes, turn on the heat preservation indicator and turn off the heating indicator. It is expected to be finished in half an hour. At this time, you can unplug the power supply and preheat it for 20 minutes. If you don't eat for a short time, you can continue to turn on the power to keep the food in the lunch box hot, and the heating time will be slightly extended in the cold areas in the north.

Step 6 fold the lunch box

In particular to a foldable portable lunch box. The portable folding lunch box is mainly made of hard materials, which mainly includes a box body, a box cover matched with the box body and a hard card for clamping the box body. The box body consists of a box bottom and a box wall, and there are creases between the box bottom and the box wall and on the side of the box wall. The creases are made of flexible materials, and the box body can be folded into sheets due to the matching of the creases.

Can stainless steel lunch boxes be heated by microwave oven?

Stainless steel lunch box is a closed metal, which can only reflect microwaves, but not penetrate and absorb them. If you put it in a microwave oven, the food inside cannot be heated, and the metal box cover is too close to the metal box body, which is easy to be ignited by microwaves, and in severe cases, it will explode.

Which lunch boxes can't be heated by microwave?

1, plastic lunch boxes have poor heat resistance.

Ordinary plastic lunch boxes have poor heat resistance and cannot be used as cookware in microwave ovens.

2. Glass lunch boxes with poor heat resistance

When cooking food with oil, the temperature may be very high and it is easy to break the glass lunch box, so you can't use a glass lunch box that is not heat-resistant.

3. The microwave oven is impervious to metal lunch boxes

Aluminum pot, enamel pot, stainless steel pot and other metal lunch boxes can't be penetrated by microwaves, and the metal will collide with the inner wall of the furnace and can't be used.

4, lacquer lunch box

The paint on the painter's lunch box may peel off and melt after heating, resulting in harmful substances, and the container may also crack. Eating the heated food is not good for your health.