| 主权项 |
1. A double sealing device for a machine for the plasma treatment under high vacuum of containers in combination with a container, comprising at least first and second annular sealing surfaces cooperating respectively with first and second separate annular zones of a neck of a container, the neck of the container having protuberances for removably attaching a cap, the neck further comprising a collar below the protuberances, the first annular sealing surface is an upper annular sealing surface cooperating with a mouth of the container, the second annular sealing surface is a lower annular sealing surface cooperating with the collar of the container, the first and second annular sealing surfaces are borne respectively by two separate upper and lower elastic gaskets made of silicone or rubber, the double sealing device further comprising a sleeve made of a rigid material, the sleeve having a cylindrical body and a through-hole, the cylindrical body extending by a tubular skirt, the upper elastic gasket, in contact with the plasma, having an angled profile in cross section and received in a counter-bore made in the sleeve at a junction between the body and the skirt and having a lower portion at an end of which the upper sealing annular surface is formed, the counter-bore being internally bordered by a tubular protrusion configured as a frame for the upper elastic gasket, and the lower elastic gasket is mounted on the skirt and is fitted onto an annular rim that projects radially outward the skirt. |
