Flexible tubular structures
AssigneeW. E. Rawson Limited
InventorAlexander Charles Edward Johnson
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Abstract
A flexible tubular structure for use in the lining of passageways and methods relating thereto are described. The tubular structure is made of a laminate which comprises a film layer, made by melting and mixing ethylene-vinyl acetate copolymer (EVA) and polyethylene, and a felt layer. In a butt join region of the structure, a felt strip and polyethylene/EVA strip are heat welded for strength.
Claims26
An underground passageway comprising a flexible tubular structure, the structure comprising a first layer and a second layer in contact therewith, the first layer being a fibrous layer capable of being impregnated with a resin and the second layer comprising a material formed by mixing a first component comprising polyethylene and/or polypropylene with a second component comprising an optionally substituted alkene-vinyl alkanoate copolymer.
An underground passageway comprising a flexible tubular structure comprising a first layer and a second layer in contact therewith, the first layer capable of being impregnated with a resin and the second layer being formed from a mixture which comprises a first component which comprises polyethylene and/or polypropylene and a second component which comprises an alkene-vinyl alkanoate copolymer.
A sewer passageway comprising a flexible tubular structure, the structure comprising a first layer and a second layer in contact therewith, the first layer being a fibrous layer capable of being impregnated with a resin and a second layer comprising a material formed by mixing a first component comprising polyethylene and/or polypropylene with a second component comprising an optionally substituted alkene-vinyl alkanoate copolymer.
Dependencies are inferred from the claim text.