When the airless pump bottle is pressed, the bottom piston will run up to squeeze out the contents. When the contents are used up, the piston has already run to the top. You can remove the pump head and re-install it, or use a hard object The piston tops to the bottom and is ready to be used again.
Airless bottle refers to a container that can isolate gas from the outside temperature or a container that isolates external bacteria. The contents of the airless bottle can be completely isolated from the air to prevent the product from oxidizing and deteriorating due to contact with air, which can breed bacteria. The airless bottles commonly used in the market are composed of a cylinder and an oval container and a piston at the bottom. Its design principle is to use the contraction force of the spring and prevent air from entering the bottle, creating a vacuum state, and use atmospheric pressure to push the piston at the bottom of the bottle forward.