Cosmetic Airless Bottle

The cosmetic airless bottle used in the market is made up of a cylinder with an ellipsoid container plus a piston at the bottom. It is designed to use the spring's contraction force, and not allow air to enter the bottle, resulting in a vacuum state, and use atmospheric pressure to push the piston on the bottom of the bottle. However, because the spring force and atmospheric pressure do not give enough force, the piston cannot be attached too tightly to the cylinder wall, otherwise the piston will not be able to move forward due to too much resistance. On the contrary, if the piston is easy to move forward and prone to leakage, the cosmetic airless bottle is very high for the professional requirements of the manufacturer.