12 what kind of lunch box does the constellation use to keep warm _ twelve constellation lunch boxes

How long can the vacuum insulated lunch box be insulated? What kind of insulated lunch box is good?

When people buy insulated lunch boxes, they will pay attention to one question, that is, how long the temperature of insulated lunch boxes can be maintained, because most consumers buy insulated lunch boxes to keep their meals cool. When people use insulated lunch boxes, they usually cook in the morning, then take them to the company or school when they go out, and wait until lunch. If the food is already cold at this time, it will do harm to people's stomachs. Today we will discuss some information about insulated lunch boxes.

How long can the insulated lunch box be insulated?

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.

What kind of insulated lunch box is good?

Simple identification 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 temperature of the cup (kettle) is obviously increased, especially if the lower part of the cup is heated, it means that the product has lost its vacuum degree and can not achieve good insulation 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.

Sealing performance appraisal method: after the cup (pot) is filled with water, tighten the cork or lid clockwise, and put the cup (pot) flat on the table to make it watertight; 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.

Identification method of plastic parts: Food-grade new plastic features: 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.

In fact, from the topic we discussed today, we can see that the temperature of the insulated lunch box is still relatively long. Generally speaking, insulated lunch boxes can be kept for four to five hours, which is enough for half a day. However, it does not mean that the insulated lunch box can be kept for such a long time. It also involves whether to choose the right choice when buying insulated lunch boxes. When you get home, you can verify whether the insulated lunch box can keep warm. We also give a specific test method.

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