A collapsible tube, comprising:
- a cylindrical body formed of a laminated sheet, said laminated sheet including a metallic layer, an inside synthetic resin layer laminated onto an inside surface of said metallic layer and an outside synthetic resin layer laminated onto an outside surface of said metallic layer;
- a head formed of synthetic resin and including a shoulder member fixed on said cylindrical body and a mouth member integrally formed on said shoulder member and having an upper end opening, said head being formed of an inside layer member and an outside layer member bonded to said inside layer member outside of said inside layer member, one of said inside layer member and said outside layer member being formed of a waterproof synthetic resin material, the other of said inside layer member and said outside layer member being formed of a gas-impermeable synthetic resin material, said outside layer member having a receiving seat surface at said opening facing inward of said mouth member, said inside layer member having an upper end surface facing outward of said mouth member;
- a membrane cap closing said opening, said membrane cap being formed of a thin laminated sheet including an aluminum sheet having an inward surface facing inward of said mouth member and an outward surface facing outward of said mouth member, a synthetic resin film laminated on said outward surface of said aluminum sheet, and an adhesive resin film laminated on said inward surface of said aluminum sheet, a circumferential edge portion of said laminated sheet being fitted between said upper end surface of said inside layer member and said receiving seat surface of said outside layer member, said synthetic resin film being welded to said outside layer member;
- said synthetic resin film being attached to said receiving seat surface;
- said inside synthetic resin layer of said cylindrical body being of the same class of synthetic resin materials as the synthetic resin material of said outside layer member of said head, said inside synthetic resin layer of said cylindrical body being of a different class of synthetic resin materials as the inside layer member of said head;
- said cylindrical body being integrally connected to said head, with the attachment between the same class of synthetic resin materials of said inside synthetic resin layer of said cylindrical body and said outside layer member of said head being a gas-impermeable attachment, the attachment between the different classes of synthetic resin materials of said inside synthetic resin layer of said cylindrical body and said inside layer member of said head being a gas-permeable attachment;
- and
- said head having a flange member at a lower end thereof on said inside layer member, said flange member extending radially outwardly beneath a lower end surface of said outside layer member, one of said flange and said lower end surface having a ring-shaped concave portion extending perpendicularly from a plane containing said radially outwardly extending flange member and into fitting close engagement with a ring-shape convex portion of the other of said flange and said lower end surface, said concave portion and said concave portion being closely engaged with each other, with the attachment between said outside and inside layer members of said head being a gas-impermeable attachment.