Patent ID: 7569171

Claim:
A process for overmolding a hollow receptacle ( 7 ) having or a neck ( 70 ), and an axial body ( 71 ) including a shoulder ( 72 ), a sidewall ( 73 ) and a bottom ( 74 ), the hollow receptacle ( 7 ) having an axial height H and a maximum cross section S, comprising the steps of: placing all or part of the hollow receptacle ( 7 ) into an open mold ( 2 ); closing the mold ( 2 ) by moving at least a mobile part ( 20 ) of the mold ( 2 ) so as to form an axial cavity ( 21 ); injecting a flow of molten thermoplastic material ( 6 ) into the axial cavity ( 21 ) by an injection means ( 5 ), through an injection duct ( 210 ) in the mold ( 2 ), so as to form a deposit ( 80 ) of the plastic material on the receptacle, and thus obtaining an overmolded receptacle ( 8 ); and opening the mold ( 2 ) after the deposit ( 80 ) has cooled; and ejecting the overmolded receptacle ( 8 ) from the mold ( 2 ), wherein, during the placing step, the neck ( 70 ) or the shoulder ( 72 ) is placed in contact with an axial support part ( 4 ) of the mold ( 2 ), the axial support part ( 4 ) includes a means of masking the neck ( 70 ) throughout the overmolding process, so that the overmolded receptacle ( 8 ) has a free neck ( 81 ) that can be closed off by a closing means, before the closing step, the sidewall ( 73 ) of the receptacle ( 7 ) is placed in a lateral positioning means ( 3 ) which is moveable along an axial direction ( 22 ) of the mold ( 2 ), during the injecting step, the material flow ( 6 ) forms an annular flow ( 6 ′) that surrounds the sidewall ( 73 ) and displaces the lateral positioning means ( 3 ) in the axial direction of the axial cavity ( 21 ), so that the lateral positioning means ( 3 ) and the material flow advance forwards ( 220 ) in the axial direction to obtain the overmolded receptacle ( 8 ), and the overmolded receptacle ( 8 ) is ejected by movement of the lateral positioning means ( 3 ) backwards ( 221 ) along the axial direction to return the lateral positioning means ( 3 ) to an initial position in the mold ( 2 ) at the placing step.