Semipermeable venting closure
AssigneeArgo AG Plastic Packaging
InventorsJannis Pagidas, Efstathios Koklas, Alexis Stassinopolous
Life of this patent
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Abstract
A venting cap (1) has a cavity (7), at least one first passage (4) for fluids connecting the cavity (7) with the inside of the container, at least one second passage (5.1, 5.2, 5) for fluids connecting the cavity (7) with the outside of the container, and a liquid-absorbing mass (8) arranged within the cavity (7). The liquid-absorbing mass (8) acts, after absorption of liquid, as a selective filter prohibiting the passage of liquid, but permits the passage of gas. This ensures the foolproof selective permeation of gas but not of liquid. Venting properties remain unaltered even at extreme conditions of transportation and storage.
Claims10
A venting cap for a container (9) comprising
- means defining a cavity (7) having an interior volume;
- at least one first fluid passage (4) connecting said cavity (7) with the inside of said container (9);
- at least one second fluid passage (5.1, 5.2, 5) connecting said cavity (7) with a region outside said container (9);
- and
- a water-absorbing mass (8) of organic granules in said cavity (7), said granules comprising crosslinked carboxylic acid polymers and copolymers polymerized in an organic solvent, said water-absorbing ganules expanding, after absorption of water, to form a selective filter prohibiting the passage of liquid and permitting the passage of gas.
Dependencies are inferred from the claim text.