Coated recoverable articles
AssigneeRaychem Corporation
InventorsJos Van Beersel, Eddy Alaerts
Life of this patent
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Abstract
A sleeve, which finds particular application in the environmental sealing of joints between insulated pipes, comprises heat-recoverable polymeric sheet material provided at separate regions of a principle surface thereof with a layer of a heat-activatable adhesive for bonding the sheet to the pipe insulation, and a layer of a sealant to accommodate flexibility in the joint. A layer of a sealing material, having an elongation modulus greater than that of the sealant, overlies at least part of the sealant layer, to improve the pressure retention properties of the sleeve.
Claims11
A sleeve for sealing an end of a joint between two insulated pipes from which the insulation has been removed at the ends thereof exposing uninsulated end portions over which a hollow casing capable of accommodating a foam insulation material has been positioned so as to overlap the pipe insulation at each end of the joint, said sleeve comprising a heat-recoverable polymeric sheet having:
- (a) a first layer of a heat-activatable adhesive at a region of a principal surface of the sheet, the adhesive being arranged so as to provide a substantially annular bond between the polymeric sheet and the pipe insulation at one side of the joint;
- (b) a layer of sealant at a second region of the said principal surface;
- and
- (c) a layer of a sealing material which overlies at least a portion of the layer of sealant, and which has an elongation modulus that is greater than that of the sealant;
- each of said sealant and said sealing material being arranged so as to bridge said casing and the pipe insulation at said one side of the joint.
Dependencies are inferred from the claim text.