What is the material of vacuum flask
Temperature is usually made of ceramic or stainless steel with vacuum containers of water are made, top cover, seal, vacuum insulation blanket can make in inside the liquid such as water slow cooling, in order to achieve the purpose of heat preservation. Developed vacuum cup from a thermos, thermal insulation on the same principle as a thermos, people just for the convenience of the bottle into a cup. Heat has three ways: the spread of radiation, convection, and transfer. Vacuum cup silver cup bile can reflect the hot water radiation, vacuum cup bile and cup body can block the heat transfer, and less prone to the bottle can prevent heat convection heat transfer. Now the vacuum flask, also applied the principle of magnetized water, is at the bottom of the bottle and cap with magnets, make water is magnetized. It is said that magnetized water has magic effect. Thermos (or vacuum), its wall is composed of double deck glass, and double deck glass intermediate for vacuum, vacuum thermal conductivity, i.e., via a vacuum hot water, cut off from the outside world, hot water is not easy to get cold, achieve the purpose of the insulation), and low thermal conductivity is commonly used in the lid (such as wood, hollow plastic, etc.) of the vacuum cup in the middle for the double deck glass inside. Between the two layers into a vacuum state. And silver plated or aluminum
To say the material of vacuum flask, first to understand how the heat lost way, this way has three: Conduction; Convection; Radiation. As long as prevented it from three ways, can greatly reduce heat loss, maintain a certain temperature for a long time. In order to reduce the heat conduction and used poor conductor glass vacuum flask, and adopted double vacuum process, reduce the heat conduction losses as much as possible; In order to reduce the convection loss, vacuum flask used the cork, let the internal space and external isolation; In order to reduce radiation loss, vacuum flask for the coating. Early use silver mirror reaction is silver plated, so prices high. With the development of science and technology, to be able to use more cheap coating on aluminum metal, greatly reduces the cost, let thermos walked into the thousands.
Everyday items, there is made of bamboo sticks, sheet metal, plastic and other outside shell, built in inside. Inside the double deck glass, laminated on both sides of silver plated metal, such as the middle into vacuum, bottle stopper, may in the longer term keeping the temperature inside the bottle. Usually called thermos of hot water. The usually called ice pail cold.
Made two layers of glass, the glass, vacuum, vacuum thermal conductivity is bad, the effect of heat preservation.
