Cosmetic airless bottles are packaging containers that isolate the air and utilize the pressure difference to expel the contents. Their main function is to prevent cosmetics from coming into contact with air, which could lead to oxidation, contamination or deterioration. They are particularly suitable for products such as essences, lotions and face creams that are easily affected by the environment.
The technology behind airless bottles is both elegant and effective. The vacuum of a airless bottle does not mean absolute vacuum; rather, it refers to the isolation of the container’s interior from the outside air. When the bottle is first filled with cosmetics, the piston is at the bottom of the bottle, and the contents fill the entire space. When the pump head is pressed, the pressure inside the pump head increases, and some of the stored contents are pushed out of the nozzle through the conduit. When the pressure inside the bottle is lower than the external atmospheric pressure, the external pressure will push the piston at the bottom to move upward, filling the space left after the contents are discharged, always keeping the bottle in a “full” state and preventing air from entering.
This vacuum technology eliminates the need for droppers or straws commonly found in traditional pump bottles. Because there is no air inside the bottle, the risks of contamination, oxidation and product degradation are greatly reduced. Some manufacturers’ designs may allow air to enter due to poor sealing of the piston, affecting the usage effect. Therefore, they have very high requirements for the precision of the process.
Now that we know the working principle of airless bottles, let’s take a look at what their advantages are.
| isolate the air | Prevent the contents from oxidizing and breeding bacteria to extend the shelf life |
| reduce waste | The piston can push out the last drop of product remaining in the bottle, which has a higher utilization rate |
| Convenient and hygienic | There is no need to open the bottle cap. Just press to take the liquid, reducing hand contact contamination |
It should be noted that once the airless bottle is assembled, it cannot be opened in the middle to add cosmetics, otherwise the vacuum state will be disrupted.
In conclusion, airless bottle through ingenious pressure difference design and sealing structure, achieve oxygen-free preservation and efficient access of cosmetics, and are currently a commonly used packaging technology for high-end skin care products.
Surm Bottle – Source： Oulete
Glass Dropper Bottle – Source： Oulete
Foundation Bottle – Source： Oulete