Patent ID: 7335011
Filing Date: 2008-02-26
Classification: B29C,B29L

Abstract:
1. A device for compression moulding plastic containers (P), having an internal cavity ( 6 ) communicating with the outside through an opening comprising a mould ( 1 ) with a plunger ( 5 ) to shape at least part of said internal cavity ( 6 ) of the container (P), a female mould ( 14 ) to shape part of the external surface of the container (P), being able to reach a reciprocal coupling position in order to shape the container (P) by sliding in the opening or closing direction of the mould ( 1 ), and at least two moving mould completion elements ( 7 , 8 ) to finish said external surface of the moulding cavity, said device also including a slide ( 22 ), being able to slide in the opening or closing direction of the mould, the slide being provided with a cylindrical cavity ( 24 ) and a cylinder ( 16 ) able to slide inside the cylindrical cavity ( 24 ) in the opening or closing direction of the mould and to keep the mould ( 1 ) in the closed position by applying a retaining force on said mould completion elements ( 7 , 8 ), and characterised in that it comprises means for operating the plunger so that said plunger ( 5 ) can slide along the opening or closing direction of the mould ( 1 ) inside the cylinder ( 16 ) for at least a segment of its length with respect to said cylinder ( 16 ) and said slide ( 22 ), and means for applying an appropriate continuous compression force on said plunger ( 5 ) in order to further sink said plunger into the plastic, depending on the contraction in volume, in order to compensate for thermal shrinkage during cooling.