What does the lunch box do? Lunch box makes you play an important role in busy work, study and life, and gradually becomes an indispensable daily necessities and very useful items in our daily life. Let me introduce the function of lunch box in detail for you.

What does the lunch box do? 1 1. What is a lunch box?

The definition of lunch box refers to a kind of box specially used to hold rice and vegetables, alias "lunch box", which is a daily necessities tailored for busy staff and students. Most lunch boxes are made of aluminum, stainless steel, plastic and foam, and some are made of glass. Lunch boxes made of aluminum and stainless steel are of better quality, lighter and less prone to rust. It is not easy for students to break down, and it is more economical. Cheap sickle is really a good choice. Plastic and foam are generally fast food, because the packaging boxes used in general stores are made of plastic and foam. In the past, fast food was usually packed in a lunch box made of foam, because the original price was cheap and the weight was light, but one problem with this one was that the food packed in foam was a little unsanitary, and the foam was also resistant to high temperature. If the food temperature is too high, the foam will have the plastic smell of melting foam, which is harmful to people's health.

At present, take-away disposable lunch boxes are all made of plastic, because plastic disposable lunch boxes are lighter and stronger than foam packaging boxes and are not easy to rot. However, lunch boxes made of plastic also have disadvantages. Plastic lunch boxes waste resources and pollute the environment. There is also a glass lunch box, which is more beautiful and environmentally friendly, suitable for people with exquisite life, not suitable for students and busy people. Each lunch box has its own characteristics and is suitable for different environments and people.

2. What are the functions of the lunch box?

When it comes to the functions of lunch boxes, some people will definitely say that they are used to hold rice, but what I want to tell you today is that lunch boxes have many functions, not just for holding rice. He has many extra functions.

1, bento, for people who are busy at work.

2, packing box, in today's developing society, everyone can't live without takeaway life, and packing box is one of the most important items for merchants. Without a box, your take-out can't be delivered to you perfectly.

3, rice bowl, for students, lunch box is a bowl to eat, if you want to eat well in school, it is inseparable.

4, fruit bowl, there is no fruit bowl at home, you can use a glass lunch box instead, when you want to go out, you can also take a transparent lunch box as a snack.

5, fresh-keeping box, when you want to make milk tea or other things, you can use a lunch box to keep fresh in the refrigerator, clean and hygienic.

The above is the lunch box I introduced. Now the lunch box is not a single iron lunch box. With the development of society and the progress of the times, various types of lunch boxes have different functions, which can solve many troubles for you. Different types of lunch boxes are suitable for different people. After reading my introduction today, you should have an idea and know what kind of lunch box you are suitable for! Finally, thank you for watching.

What does the lunch box do? How long can the lunch box be kept warm?

Under normal circumstances, good quality insulated lunch boxes can be insulated for 4-5 hours, and the insulation time of different brands of insulated lunch boxes is different. The insulated lunch box is composed of ordinary lunch boxes, with an insulated shell, the inner and outer layers filled with foam plastic, and the inner layer plated with metal film. Reduce heat loss caused by conduction, radiation and convection. An electric heating device is installed between the lunch box and the shell to supplement the heat loss and keep the food at a certain high temperature.

How to choose an insulated lunch box

Simple appraisal method of thermal insulation performance

Pour boiling water into the thermos cup, tighten the cork or lid clockwise for 2-3 minutes, and then touch the outer surface of the cup with your hands. If the cup (kettle) has obvious temperature rise phenomenon, especially the lower part of the cup is heated, it means that the product has lost its vacuum degree and can not achieve good heat preservation effect, but the lower part of the thermos cup is always cold. Myth: Some people use their ears to determine whether there is a hissing sound, but they can't hear whether it is a vacuum.

Identification method of plastic parts

Characteristics of food-grade new plastics: small smell, bright surface, no burr, long service life and not easy to age. Ordinary plastics or recycled plastics are characterized by large smell, deep color, many burrs, easy aging and easy fracture. This will not only affect the service life, but also affect the hygiene of drinking water.

Sealing performance appraisal method

After adding water to the cup (pot), tighten the cork or lid clockwise, and put the cup (pot) flat on the table so that no water leaks out; The screw-in and screw-out of the cup (pot) cover and the cup mouth should be flexible without gap. Fill a glass of water, turn it upside down for four or five minutes, or shake it a few times to verify whether it leaks.