Patent ID: 6413467
Filing Date: 2002-07-02
Classification: B29B,B29C,B29K,B29L

Abstract:
A method of making a container to which entry is via an opening having a detent (5) for positively retaining a closure member within that opening, the material of the container being susceptible to deformation when heated, characterised in that in a first stage an embryo container (1) is formed as a closed end tube (2) with an outward, generally radial flange (4, 7) at its mouth, part of the upper surface of which flange is to provide the inside of the opening, the detent (5) being simultaneously formed as a projection from or depression in said surface, and in that in a second stage the outer peripheral portion (7) of the flange is held fast while the tube (2), at an elevated temperature, is expanded by differential pressure, this drawing down and forcing outwardly the inner portion (4) of the flange and transforming said upper surface from an upwardly facing one into a passage providing the opening with the detent (5).