Bell-type nozzle blow-molding installation

A blow molding or stretch-blow molding installation for manufacturing receptacles from blanks of thermoplastic polymer, in particular polyethylene terephthalate (PET), said installation comprising a blow nozzle of the bell-nozzle type for blowing a fluid under pressure into a blank disposed in a cavity of a mold, said nozzle having its end in the shape of a bell which is suitable, during blow-molding, for being pressed into leaktight end-to-end abutment against a wall of the mold while capping the neck of the blank that emerges from said wall against which said blank is in abutment via an annular collar while its body is engaged in said cavity of the mold;

• wherein said installation comprises means for securing the nozzle to said wall of the mold by releasable mutual attraction, which means can be activated, after the nozzle has been brought into end-to-end contact with said wall of the mold without flattening a sealing gasket, so as to attract the nozzle and said wall towards each other with an attraction force greater than the repulsion force due to the pressure of the blow-molding fluid.