Cosmetic Airless Bottles : Keep The Bottle In A Vacuum
The    Cosmetic Airless Bottles    has an oval or round container and the piston is free to move at the bottom of the bottle. The working principle is to use the elasticity of the spring and empty the air in the bottle to keep the bottle under vacuum, and then use some pressure so that the inside of the bottle can move the piston.   Many skin care products...
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