"Nuanbaobao" is also called warm patch. The reaction principle is to use primary batteries to speed up the oxidation reaction and convert chemical energy into thermal energy. In order for the temperature to last longer, the mineral material vermiculite is used for insulation.

In the 1970s in Japan, someone invented the heating patch based on chemical knowledge. It does not require fire, electricity, water or other energy sources. It can generate heat by tearing open the outer bag and can maintain it for about 8-18 hours (average temperature 52℃), so it is called a warm-up bag or a heating bag (convenient body heater).

In Japan, the convenient body stove has become a necessity of modern life. When doing outdoor activities in winter, it can prevent muscles from being overcold and tense, prevent frostbite on hands, prevent colds, or relieve low back pain, leg pain, shoulder pain and other physical pain. During the winter in Japan, the sales volume within three months was more than 800 million. In 2005, the total domestic sales in Japan were 1.47 billion thermal patches. Because no fire is used, it is safe for children and the elderly.

Extended information:

Not suitable for the following groups:

1. Infants and young children

Infants and young children have poor ability to resist cold and need more Heating items, and their poor expression ability, if parents fail to take careful care of them, can easily lead to low-temperature burns.

2. Children

Although children have the ability to express themselves, their attention is easily attracted by other things and they often forget to take off the baby warmer. They need to be used under parental supervision.

3. Elderly people

Old people have slow skin sensation due to their age and are not sensitive to temperature stimulation. They are prone to burns under the continuous action of low temperature.

Baidu Encyclopedia - Nuanbaobao