Why bottom refill bottles avoid air entry

Bottom refill perfume bottles can completely avoid air entry, relying on the dual protection of precision one-way valve structure and vacuum negative pressure filling technology, which is the key technical support for long-term fragrance preservation. The bottle is equipped with a high-precision one-way check valve at the bottom filling port. This valve only allows perfume liquid to be sucked upward into the bottle cavity, and completely blocks the backflow of external air and gas. Before filling, the interior of the bottom refill bottle is in a micro-vacuum state. When pressing for filling, the internal residual air is completely discharged with the liquid suction process, and the one-way valve closes instantly after filling is completed, forming a completely airtight closed space inside the bottle. Traditional top-filling bottles will inevitably mix a large amount of air into the cavity during opening and pouring, and the air cannot be discharged, leading to continuous oxidation reaction between air and perfume molecules. In addition, our upgraded bottle body adopts an integral seamless sealing process, with no gaps in the assembly parts, which further ensures zero air penetration. This air-free storage environment can completely retain the original top, middle and base notes of perfume, greatly extend the effective storage time of fragrance products.