Patent ID: 6224817
Filing Date: 2001-05-01
Classification: B29C,B29L,Y10S

Abstract:
A process of manufacturing a container of thermoplastic material with a bottom which has a curved central section with an inward convexity, from a rough shape having a body, said rough shape having a bottom including a curved central section with an inward convexity with a hollow central section, the process of manufacturing a finished container comprising the steps of:heating the body of the rough shape in order to bring the thermoplastic material to a softening temperature;positioning the rough shape inside of a finishing mold designed to obtain the finished container, said mold containing at least a bottom with a curved central section whose shape and size allow said curved central section to be inserted into the hollow central section of the bottom of the rough shape, andfinishing said container by blowing of the rough shape, during which the curved central section of said mold is inserted in the hollow central section of the bottom of the rough shape,wherein in order to facilitate a centering of the bottom of the rough shape in relation to the curved central section of the bottom of the mold at the moment of contact between them, a relative movement of rotation between at least the curved central section of the mold and the hollow central section of the bottom of the rough shape is performed between a moment when the rough shape is inserted into the mold and a moment when said curved central section of the mold and said hollow central section of the rough shape are in an aligned position in relation to one another; andwherein the relative rotation is performed by rotating the curved central section of the bottom of the mold in relation to other parts of the mold.