Blow-molding device provided with means for attaching, by suction, a half-mold to a back wall of a corresponding recess of a mold carrier

Molding device (10) for a machine for producing chambers, notably bottles, in thermoplastic material by blowing or drawing-blowing a pre-heated preform, the molding device (10) including:

• two half-molds (14) each of which is provided with a half-imprint (16) and each of which includes a joint face (18) and an external face (20);
• two mold-carriers (34) each of which is provided with a recess (40) intended to receive an associated half-mold (14) in a mounted position in which the external face (20) of the half-mold (14) is in contact with the bottom (42) of the recess (40);
• and
• fixing means (44, 52) adapted to fix each half-mold (14) demountably in the recess (40) of the associated mold-carrier (34),
• characterized in that the fixing means (44, 52) are controlled means for aspiration by the sucker effect of the half-mold (14) against the bottom (42) of the recess (40) of the mold-carrier (34),
• characterized in that at least one airtight chamber (44) is reserved at the interface between the mold-carrier (34) and the half-mold (14) in the position mounted on the mold-carrier (34), and in that the airtight chamber (44) communicates with a vacuum source (52) via an aspiration conduit (54) to enable establishing in the airtight chamber (44) of a fixing pressure less than atmospheric pressure, and
• characterized in that the airtight chamber (44) is sealed by at least one seal that is carried by one of the group consisting of i) the half-mold (14), and ii) the mold-carrier (34).

Molding device (10) for a machine for producing chambers, notably bottles, in thermoplastic material by blowing or drawing-blowing a pre-heated preform, the molding device (10) including:

• two half-molds (14) each of which is provided with a half-imprint (16) and each of which includes a joint face (18) and an external face (20);
• two mold-carriers (34) each of which is provided with a recess (40) intended to receive an associated half-mold (14) in a mounted position in which the external face (20) of the half-mold (14) is in contact with the bottom (42) of the recess (40);
• and
• fixing means (44, 52) adapted to fix each half-mold (14) demountably in the recess (40) of the associated mold-carrier (34),
• characterized in that the fixing means (44, 52) are controlled means for aspiration by the sucker effect of the half-mold (14) against the bottom (42) of the recess (40) of the mold-carrier (34), and
• characterized in that the half-mold (34) is equipped with means (68) for mechanically attaching it to the mold-carrier (34) in order to enable retention of the half-mold (14) on the mold-carrier (34) on stopping the controlled fixing means (44, 52).