Gas-permeable, liquid-tight closure
AssigneeRiedel-de Haen Aktiengesellschaft
InventorHorst Schulz
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Abstract
A gas-permeable liquid closure for containers of liquids or solids which emit or absorb gas is provided by a film of an unsintered tetrafluoroethylene having a thickness of from about 0.1 to 3 mm., a fibrillated structure and a density of less than about 1.4. The film is supported across an opening of the container by a perforated cap or perforated sealing diaphragm which is disposed on either one or both sides of the film.
Claims14
A gas-permeable liquid-tight sealing device for a container, comprising a closure for the container, a gas-permeable sealing film disposed within said closure, said film having a thickness of from about 0.1 to 3 mm. of unsintered tetrafluoroethylene polymer having a fibrillated structure and a density of less than about 1.4, and an opening in said closure disposed adjacent said film through which gases flowing through said film can pass while liquids are contained within said film.
The process of sealing an opening in a container in a gas-permeable manner comprising the disposition of a film of gas-permeable material across the opening, the film having a thickness of from about 0.1 to 3 mm., comprising an unsintered tetrafluoroethylene polymer having a fibrillated structure and a density of less than about 1.4.
Dependencies are inferred from the claim text.