Popcorn is one of the traditional snacks in China. The street vendors in memory are all woven by hand-shaped popcorn mechanism. The structure of popcorn is also simpler. The body part is an oval black iron furnace with one end open. Put a proper amount of corn or rice into the furnace, close the furnace cover at the opening and release the heat of the iron furnace. There is pressure on the furnace cover, which can display the air pressure value in the furnace in real time. When the air pressure rises to a certain degree, put the open end of the stove into the bag, open the lid of the stove, and spray a lot of popcorn into the bag with a bang to make the popcorn burst.
Why does rice extend to popcorn?
Rice will extend to popcorn, which is actually a combination of temperature and pressure. In a sealed container, the internal air volume is constant, and when the temperature rises, the pressure in the container increases. In the same way, when the iron furnace is heated, the air pressure in the furnace gradually increases; At the same time, the rice in the furnace also has high temperature, and the water in the rice gradually evaporates and is continuously concentrated in the furnace. With the increasing temperature, the air pressure in the furnace is getting bigger and bigger. Under the action of high pressure, the evaporation of water in rice is blocked, and the residual water in rice is also heating up, so rice particles are usually in balloons. Because it is also restricted by the air pressure in the furnace, the pressure difference is not big enough, so the rice grains have not burst. When the furnace rises to 2-3 atmospheres, its heat stops. At the speed of opening the furnace cover, the rice grains under high temperature and high pressure suddenly contact with the lower air pressure, which breaks away from the binding force of the air pressure in the furnace, and the water in the rice grains expands to form popcorn.
Nowadays, the old popcorn machines are basically replaced by the new expansion technology. Basically the same, but the equipment of the new process is more advanced, safer and more efficient. You can also make various flavors. Rich.
Popcorn is crispy, but it is not recommended. There is lead or lead-tin alloy in the old popcorn oven, which will release lead in the form of lead smoke or lead vapor at high temperature, which is easy to be adsorbed by explosion. This high-end crowd is more harmful to health. In particular, when lead is absorbed by the human body, it will damage the nerves, hematopoietic system and digestive system, making children grow slowly, and their resistance and main symptoms are irritating. Anxiety, loss of appetite, diarrhea or constipation. At present, the dining tables in cinemas are all made of popcorn, but some popcorn has too many additives such as frost and taste, which increases the energy and trans fatty acid content of popcorn and is unhealthy for long-term consumption. Snacking, eating more, hurting the body, eating reasonably and satisfying.