Patent ID: 7563089

Claim:
A molding device for manufacturing containers, particularly bottles, made of thermoplastic, such as PET, by blow-molding or stretch-blow-molding and which are liable to have different heights, said molding device comprising at least one mold which comprises two mold halves able to move relative to one another and a mold base able to move relative to the two mold halves in axial translation, each mold half comprising a mold holder, a shell holder fixed to the mold holder and a shell supported by the shell holder, the two shells and the mold base comprising respective molding cavity portions which, when the mold is in the closed position, together define a molding cavity, means for compensating for the blowing pressure being provided between a mold holder and the respective shell holder, comprising the following combination of features: to manufacture containers of the tallest height (maximum height), the shell holders and shells have substantially identical respective heights, to manufacture containers of heights shorter than said maximum height, the shells have a height shorter than that of the respective shell holders and reinforcing means are provided on the respective internal faces of the shell holders in those parts thereof that are not cooperating with the respective shells, said reinforcing means being able radially to reinforce those parts of the shell holders that are not cooperating with the respective shells when the pressure-compensating means are active.