Patent ID: 6022435
Filing Date: 2000-02-08
Classification: B29C,B29D,B29K,B29L,B65D

Abstract:
A method of manufacturing a multiple wall tank for the storage of liquids having an outer jacket bonded to an inner tank surrounding and proximal to an inner tank aperture, said method comprising the steps of:providing a rigid, inner tank having generally cylindrical sidewall portions, end portions generally transverse to said sidewall portions and a central axis extending generally longitudinally between said end portions, with said inner tank having an exterior surface, and at least one aperture formed through said inner tank;applying a first thermoplastic synthetic resin material to a portion of said exterior surface of said inner tank surrounding and proximal to at least a portion of said aperture to define a layer of resin material surrounding and proximal said aperture;applying an outer sheath of a substantially liquid-impervious thermoplastic synthetic resin material over said inner tank and said synthetic resin layer;providing spacing means intermediate said exterior surface of said inner tank and said outer sheath to provide for substantially free passage of liquids between a substantial portion of said exterior surface of said inner tank and at least a portion of said outer sheath; andbonding said outer sheath to said resin layer surrounding and proximal to said aperture, such that a substantially liquid-impervious seal is formed between said outer sheath and said inner tank around said aperture.