Cosmetic plastic bottle - vacuum bottle

A vacuum bottle is a container that isolates the gas from the outside temperature or a container that isolates the external bacteria. Its contents can be completely isolated from the air, avoiding oxidative deterioration and bacteria growth due to exposure to air, and upgrading its product quality with its high-tech concept. The vacuum bottle that is used in the market consists of a cylindrical ellipsoidal container plus a piston placed at the bottom. Its design principle is to use the contraction force of the spring, and does not allow air to enter the bottle, causing a vacuum state, and using atmospheric pressure to push the piston of the bottom of the bottle to advance. However, due to the spring force and atmospheric pressure, sufficient force cannot be given, so the piston cannot fit too tightly with the bottle wall, otherwise the piston will not be able to rise and advance due to excessive resistance; on the contrary, if the piston is easy to advance and is prone to leakage, Therefore, vacuum bottles have very high requirements for the professionalism of the manufacturer.