Abstract: A mouthpiece structure for a pressure vessel includes a liner constituting a vessel body and a cylindrical part, a cylindrical mouthpiece mounted closely to an inner periphery of the cylindrical part, a housing part having a housing recess formed by recessing at least one of the inner periphery of cylindrical part and an outer periphery of mouthpiece, a sealing member housed in the housing recess while adhering closely to the inner periphery of cylindrical part and the outer periphery of mouthpiece, the sealing member defining a sealed space facing an interface between the inner periphery of the cylindrical part and the outer periphery of the mouthpiece in the housing recess, and a retainer located opposite the sealed space with the sealing member being interposed between them and preventing the sealing member from being displaced in a direction such that the sealing member increases a capacity of the sealed space.

Abstract: An automobile fuel tank includes an outer wall including a main body of a multiple-layered synthetic resin, in which the outer wall includes at least an outer body layer, an outer adhesive layer, a barrier layer, an inner adhesive layer, and an inner body layer. The outer body layer and the inner body layer include a high density polyethylene (HDPE) as a main ingredient. Each of the outer adhesive layer and the inner adhesive layer includes a synthetic resin having adhesiveness against both the high density polyethylene (HDPE) and the barrier layer. The barrier layer includes a synthetic resin.

Abstract: A mouthpiece structure for a pressure vessel includes a liner made of a synthetic resin, and constituting a vessel body and a cylindrical part communicating between an interior and an exterior of the vessel body, a cylindrical mouthpiece mounted closely to an inner periphery of the cylindrical part, a retainer having a covering portion which covers regions of outer surfaces of the cylindrical part and the mouthpiece respectively and a peripheral wall surrounding the cylindrical part, the cylindrical part and the mouthpiece having an interface between an inner periphery of the cylindrical part and an outer periphery of the mouthpiece, the interface having a distal end facing the regions, a first sealing member disposed between the mouthpiece and the covering portion, and a second sealing member disposed between the cylindrical part and the peripheral wall of the retainer.

Abstract: A mouthpiece structure for a pressure vessel includes a liner made of a synthetic resin, and constituting a vessel body and a cylindrical part communicating between an interior and an exterior of the vessel body, a cylindrical mouthpiece mounted closely to an inner periphery of the cylindrical part, a retainer having a covering portion which covers regions of outer surfaces of the cylindrical part and the mouthpiece respectively and a peripheral wall surrounding the cylindrical part, the cylindrical part and the mouthpiece having an interface between an inner periphery of the cylindrical part and an outer periphery of the mouthpiece, the interface having a distal end facing the regions, a first sealing member disposed between the mouthpiece and the covering portion, and a second sealing member disposed between the cylindrical part and the peripheral wall of the retainer.

Abstract: A mouthpiece structure for a pressure vessel includes a liner constituting a vessel body and a cylindrical part, a cylindrical mouthpiece mounted closely to an inner periphery of the cylindrical part, a housing part having a housing recess formed by recessing at least one of the inner periphery of cylindrical part and an outer periphery of mouthpiece, a sealing member housed in the housing recess while adhering closely to the inner periphery of cylindrical part and the outer periphery of mouthpiece, the sealing member defining a sealed space facing an interface between the inner periphery of the cylindrical part and the outer periphery of the mouthpiece in the housing recess, and a retainer located opposite the sealed space with the sealing member being interposed between them and preventing the sealing member from being displaced in a direction such that the sealing member increases a capacity of the sealed space.

Abstract: {Problem} To provide a fuel tank with excellent blow moldability, high deformation-suppressing properties and high heat resistance. {Solution} In an automobile fuel tank, a high-density polyethylene (HDPE) of an outer body layer 12 and an inner body layer 16 of an outer wall 10 has the following physical properties: 1) a modulus of elasticity of 1100 to 1400 MPa at 23° C.; 2) a modulus of elasticity of 340 to 430 MPa at 65° C.; 3) a modulus of elasticity of 400 to 510 MPa at 23° C. after being immersed in Fuel D for 200 hours at 65° C.; 4) a Charpy impact strength of 7 to 14 kJ/m2 at ?40° C.; 5) a full-notch creep test (FNCT) result of 50 to 300 hours at 80° C.; 6) a melt flow rate (MFR) result of 4 to 6 (g/10 minutes) at 190° C. and a load of 21.6 kg; and 7) a melt tension of 18 to 25 g when a sample that has been melted at 210° C. is extruded from a nozzle with a diameter of 2.095 mm and a length of 8 mm at an extrusion rate of 15 mm/minute, and drawn at a take-up speed of 7.5 m/minute.