Hollow article made of an oriented thermoplastic

Claim 1

In a hollow article made of a molecularly oriented thermoplastic and comprising a neck zone, a side wall of generally cylindrical shape, and a reentrant base, the improvement wherein said base consists, successively, starting from the periphery of said article, of a periphery arched profile connected to said side wall, a substantially planar annular zone joining onto said peripheral arched profile, which annular zone is in the shape of a truncated cone which forms an angle of between 1° and 15° with a plane at right angles to the longitudinal axis of said hollow article, with the inner edge of said annular zone being at a higher level than its outer edge, and a central part in the form of a recessed dome which is connected to said annular zone and the diameter of which is less than 40% of the maximum external diameter of said hollow article, said central part in the form of a recessed dome consisting, successively, of an arched zone which provides the connection with said annular zone, a zone in the shape of a truncated cone, and a central cap pointing towards the interior of said hollow article, and connecting with said truncated cone zone.