Gasket
AssigneeFlexitallic Investments, Inc.
InventorsStephen Peter Bond, Stuart John Shaw, David Peter Gerrard
Life of this patent
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Abstract
A gasket having concentric or spiral serrations around the aperture on each side of the gasket, and wherein a facing is secured to such serrations, wherein each facing comprises a first layer which is in contact with a respective set of such serrations and a second layer which is in contact with the first layer. The first layer could be of a polyaryletherketone or polyimide, and the second layer could be of graphite or vermiculite. The serrations are designed to avoid damage to the first layer. An intact first layer can supply a property to the facing which may be absent in the second layer; for example, good dielectric properties.
Claims19
A gasket comprising a body comprising a top surface, a bottom surface, and an aperture, wherein the top and bottom surfaces each comprise serrations around the aperture, the gasket further comprising a first facing secured over the serrations on the top surface, a second facing secured over the serrations on the bottom surface, and an adhesive;
- wherein each facing comprises a first layer which is in contact with the respective top or bottom surface serrations and a second layer which is in contact with the first layer opposite the respective top or bottom surface,
- wherein the adhesive secures each first layer to the respective top or bottom surface serrations or secures each first layer to the respective second layer,
- wherein each first layer comprises a substantially incompressible polymer film with a mean thickness of at least 75 μm and not exceeding 300 μm,
- wherein the substantially incompressible polymer film comprises at least one of
- polyaryletherketone (PEAK);
- polyetheretherketone (PEEK);
- polyimide (PI);
- fluorinated ethylene propylene copolymer (FEP);
- polyetherimide (PEI);
- polyethersulfone (PES);
- polytetrafluoroethylene (PTFE);
- ethylene-chlorotrifluoroethylene copolymer (E-CTFE);
- ethylene-tetrafluoroethylene copolymer (ETFE);
- polycarbonate (PC);
- polychlorotrifluoroethylene (PCTFE);
- polyvinylidenefluoride (PVDF);
- silicone polymers;
- polyimide (thermosetting);
- bis-maleimides (BMI);
- epoxy polymers;
- or
- phthalonitrile resins,
- wherein each second layer comprises a compressible inorganic material, and
- wherein the thickness of the second layer when uncompressed, prior to use, exceeds the thickness of the first layer.
A method of producing a gasket comprising:
- forming first and second consolidated facings each comprising a first layer and a second layer;
- and
- securing the consolidated facings over a gasket body comprising a top surface, a bottom surface, and an aperture, wherein the top and bottom surfaces each comprise serrations around the aperture,
- wherein the first consolidated facing is secured on the top surface and the second consolidated facing is secured on the bottom surface with the first layers being put in contact with the respective serrations on the top or bottom surface,
- wherein the first and second consolidated facings are secured on the top and bottom surfaces with an adhesive,
- wherein each first layer comprises a substantially incompressible polymer film with a mean thickness of at least 75 μm and not exceeding 300 μm,
- wherein the substantially incompressible polymer film comprises at least one of
- polyaryletherketone (PEAK);
- polyetheretherketone (PEEK);
- polyimide (PI);
- fluorinated ethylene propylene copolymer (FEP);
- polyetherimide (PEI);
- polyethersulfone (PES);
- polytetrafluoroethylene (PTFE);
- ethylene-chlorotrifluoroethylene copolymer (E-CTFE);
- ethylene-tetrafluoroethylene copolymer (ETFE);
- polycarbonate (PC);
- polychlorotrifluoroethylene (PCTFE);
- polyvinylidenefluoride (PVDF);
- silicone polymers;
- polyimide (thermosetting);
- bis-maleimides (BMI);
- epoxy polymers;
- or
- phthalonitrile resins,
- wherein each second layer comprises a compressible inorganic material, and
- wherein the thickness of the second layer when uncompressed, prior to use, exceeds the thickness of the first layer.
Dependencies are inferred from the claim text.