Method of vacuum packaging substances, in particular cosmetic or pharmaceutical products, inside variable-capacity containers closed by dispenser members, that prevent ingress of air, apparatus for implementing the method, and dispensers obtained thereby

A method of vacuum packaging a substance, having a consistency lying in a range from liquid to semi-solid, inside a variable capacity container adapted to be closed by a pump for dispensing said substance without allowing any air ingress inside the container, said pump creating a suction in the container when operated, said container including a flexible, freely deformable wall having a first, outer side normally in contact with atmospheric air, and a second, inner side normally in contact with said substance contained in the container, said deformable wall being able to reduce the volumetric capacity of said container through the suction created by the pump in the container when operated, said method comprising the ordered steps of:

• a) deforming the container to increase the volumetric capacity of the container and filling the container with a charge of said substance through an opening of the container,
• b) disposing the pump on the container opening such that the pump rests loosely without fitting on said opening in a non-sealed manner,
• c) disposing the container and pump in a completely enclosing enclosure,
• d) subjecting the enclosure to a vacuum to remove any residual air remaining in the container, and
• e) while maintaining the vacuum, fixedly and sealingly securing the pump to the container opening.