Blowing or stretch-blowing machine for bottles made of polymer material

A blowing or stretch-blowing machine for bottles or containers made of polymer material, the machine comprising:

• a plurality of molds movable on a transport system,
• wherein each of the molds comprises a first half-mold and a second half-mold hinged around a hinge axis and a bottom plate, and means for vertical/translation movement of the bottom plate, to cyclically form, in cooperation with suitable shaped portions, a closed cavity adapted to receive a preheated preform and to allow expansion by blowing or stretch-blowing of the preform inside the cavity to obtain a bottle or container,
• each of the molds comprises a system for synchronized opening/closing of the half-molds and of the bottom plate actuated by its own actuator independent of motorization of the machine,
• each half-mold has a C-shaped cross section which comprises a front portion, a side portion and a rear portion, and the bottom plate vertically slidable on a guide element by a slide,
• the mold comprises a sliding member which has a slide slidably mounted on guide means, the sliding member is movable between an advanced position (or closed position) and a retreated position (or open position) along a direction defined by a straight line lying in a vertical plane that divides the half-molds, and the sliding member is connected to the two half-molds by respective connecting rods, the connecting rods have first ends coaxially hinged on the sliding member and second ends respectively hinged at the junction point between the side portions and the rear portions of the half-molds such that when the sliding member is in an advanced position, the mold is closed, conversely, when the sliding members is in a retreated position the mold is open, and
• the actuator is connected to an Archimedes' screw, the Archimedes' screw is operatively connected to a movable member which comprises a tubular portion having internally bosses which mate with grooves of the Archimedes' screw such that, when Archimedes' screw rotates, the movable member moves upwards or downwards according to a rotational direction of the Archimedes' screw, and the movable member is hinged on the lower part to a pantograph mechanism for horizontal movement of the sliding member.

A blowing or stretch-blowing machine for bottles or containers made of polymer material, the machine comprising:

• a plurality of molds movable on a transport system,
• wherein each of the molds comprises a first half-mold and a second half-mold hinged around a hinge axis and a bottom plate, and means for vertical/translation movement of the bottom plate, to cyclically form, in cooperation with suitable shaped portions, a closed cavity adapted to receive a preheated preform and to allow expansion by blowing or stretch-blowing of the preform inside the cavity to obtain a bottle or container,
• each of the molds comprises a system for synchronize opening/closing of the half-molds and of the bottom plate actuated by its own actuator independent of motorization of the machine,
• each half-mold has a C-shaped cross section which comprises a front portion, a side portion a rear portion, and the bottom plate is vertically slidable on a guide element by a slide,
• the mold comprises a sliding member which has a slide slidably mounted on guide means, the sliding member is movable between an advanced position (or closed position) and a retreated position (or open position) along a direction defined by a straight line lying in a vertical plane that divides the half-molds, and the sliding member is connected to the two half-molds by respective connecting rods, the connecting rods have first ends coaxially hinged on the sliding member and second ends respectively hinged at the junction point between the side portions and the rear portions of the half-molds such that when the sliding member is in an advanced position, the mold is closed;
• conversely, when the sliding member is in a retreated position the mold is open, and
• the actuator is connected, by a transmission system, to an Archimedes' screw directly acting on the sliding member.