Concept and Invention of Vacuum Flask
Vacuum flask(www.vacuum-flask.net), it’s usually also called vacuum bottle and thermos bottle. It is a necessary daily necessity. Its cover is usually made of metal, plastic or aluminum, and there is an inner flask. And the inner flask is made from two lays of glass. The two sides of the glass is usually silver-plated, the middle is vacuum, there is a plug in the bottle mouth. The water in the bottle can be kept a certain temperature inside the bottle in a long time. And generally, those are used to store hot water are called thermos flask, and those for cold food are generally called ice flask. The inventor of vacuum flask is Jameson Dewar in the year of 1892. Dewar is an English chemist and physicist. So the vacuum flask is also called Dewar flask. However, the man who realize the multifunction of vacuum flask is a Germany glass manufacturing worker Reinhold • Berg. In 1903, he won the vacuum flask patents and at the same year he established plan to put it into the market. Berg even had a match to give a good name for his vacuum flask. The name he chose is Semo Si, namely vacuum bottle in Greek word. The vacuum bottle of Berg got a very good success. And he began to manufacture them and sell them to all over the world.
Classification and Use of Vacuum Flask
Vacuum flask can be divided into three types: 1. Small mouth type. Usually it is also called vacuum bottle. The mouth diameter of it is small, has very good insulation performance, and it is mainly used for the storage of hot water, hot drinks and the frying of traditional Chinese medicine, hot and cold juice. 2. Big mouth type. It is usually also called vacuum ice bottle. Its mouth diameter is big, easy and convenient to store and take out items. It is mainly used to store ice, cold drink with containers, iced medicament, the liquid gas and fermentation-proof material, etc. Of course, it can be also used for the storage of hot food, hot beverages with containers. 3. Cup type. Usually it is also called vacuum cup. Its mouth diameter is big, but is has small capacity. It is a kind of cup mainly used for a short time storage, which can reduce the environmental temperature to the influence of internal things.
Insulation Quality of Vacuum Flask
Check and make sure the month of the vacuum flask is fine. If there is breakage, it will affect the thermal insulation effect of the bottle or even lose the insulation ability completely. Carefully check the inner flask whether there is a breakage or not. Thirdly, take a look at the month of the vacuum flask, if the month is not round, then the bottle cork is not able to seal the month, and this will also affect the insulation performance. Last, have a look at the asbestos pad which is three black spots in the middle of the inner flask. They are a support between the inner flask and the outer flask. You have to check whether they shift or slip off or not. If they shift the place or slip off, the flask will crack due to the too much pressure.
The World’s First Vacuum Flask