Cosmetic packaging vacuum but "leak"?
After the vacuum is drawn, the oxygen in the bottle is reduced, which can prevent the oxidation of the components, stabilize the active ingredients, and inhibit the survival of the microorganisms, thereby prolonging the storage time. However, the skin care product is a liquid and cannot be completely evacuated like a solid, so the extension time is limited. In fact, most seemingly sealed packages are not vacuumed.
Judging whether or not the vacuum bottle is based on the air hole at the bottom of the bottle, if there is none, it is not. Covering the vent hole can cause it not to be squeezed. Most sealed packages remove the remaining air after production and do not really vacuum. Our common spray is a design that uses nitrogen to pressurize the bottle. It is also not a vacuum.