Method of producing a blow-molded body having multiple dimensions and device for performing the method

Device for preparing a preform for use in a blow molding process, comprising:

• a shaping unit for substantially altering the shape of a tubular component before deposition of said tubular component on a half-blow-mold;
• a nozzle for the injection of gas inside said tubular component during an extrusion;
• a conveyor device for conveying said tubular component during said extrusion and allowing an engagement of said shaping unit with said tubular component;
• said shaping unit comprising two parts, arranged on opposite longitudinal sides of said tubular component and extending, longitudinally along a substantial portion of said tubular component, relatively movable with respect to one another for substantially altering the shape of said tubular component;
• said conveyor device being distinct and provided with independent movement with respect to said shaping unit.

Method for producing a blow-molded tubular body having multiple dimensions, which comprises the following stages:

• a) completely extruding a tubular component that is closed on a front side onto a conveyor device, with injection of gas inside said tubular component,
• b) moving said conveyor device so that the tubular component is positioned between two complementary shaping bodies,
• c) subsequently, after said extrusion onto said conveyor device has been completed, moving said two complementary shaping bodies into engagement with opposite sides of said tubular component,
• d) pressing said tubular component on said opposite sides with said shaping bodies to impart an asymmetrical shape to said tubular component,
• e) depositing the shaped tubular component, in a plastic state, on a half-mold, and
• f) closing said half-mold with the complementary half-mold and blow-molding.

Device for preparing a preform for use in a blow molding process, comprising:

• a shaping unit substantially altering the shape of a tubular component before deposition of said tubular component on a half-mold;
• a nozzle for the injection of gas inside said tubular component during an extrusion;
• a conveyor device for conveying said tubular component during said extrusion and allowing an engagement of said shaping unit with said tubular component;
• said shaping unit comprising two parts arranged on opposite sides of said tubular component and extending longitudinally along a substantial portion of said tubular component, said two parts being relatively movable with respect to one another for substantially altering the shape of said tubular component;
• said conveyor device being distinct and provided with independent movement with respect to said shaping unit.