A vacuum bottle is a sealed container that isolates gas exchange through a vacuum interlayer between two layers of walls. It is primarily used for temperature maintenance or bacterial isolation, and is commonly found in insulated appliances and cosmetic packaging. Its core structure includes a vacuum-sealed interlayer; some products use silver plating to enhance insulation and reduce heat conduction, convection, and radiation. Based on usage, they can be divided into two categories: insulated bottles and cosmetic storage bottles. The former utilizes vacuum to prevent heat loss, while the latter uses a piston system to maintain a vacuum state of the contents, preventing oxidation and contamination.
This technology originated from the double-walled glass Dewar flask invented in 1892 by British physicist James Dewar, initially used for laboratory gas liquefaction research. In 1902, Germany improved the outer shell material, leading to commercialization and its gradual entry into daily life. From the 20th century onwards, vacuum technology expanded into the cosmetics field, developing sealed containers with spring-piston structures that use atmospheric pressure to drive the contents out. In the 21st century, materials science and manufacturing processes have continued to advance, for example, using antibacterial polymers to improve sealing and optimizing the user experience through structural innovation.
