Molding process by superimposed injection and blowing comprising the following steps: a. injection of the preform from an auxiliary injection unit adjacent to the mould and moving the processed material from the auxiliary injection unit into the mould through the feed channel of the first injection, which is inserted in the cavity plate and in the cavity; b. cooling the injected material and opening the mould from the partition line; c. aligning the preform on the second injection cavity and moving elements (18 and 24); d. closing the mould in the second injection cavity and triggering the mechanical ramp system from the actuator; e. upward movement of the tubular valve, opening the gas channel and establishing contact between the gas channel and the preform; f. gas injection from a gas injection system into the gas channel and control of the gas pressure; g. blowing the preform; h. cooling the blown preform near the surfaces of the moving elements (18, 24) where the blowing pressure is maintained; i. decompression of the gas existing in the pressurized gas chamber to outside of the mould acting on an air valve; j. cooling the second component; k. opening the mould from the partition line and extracting the piece from the plug; and characterized in that: - blowing the preform of step g. and simultaneously injecting the second component, through an injection unit displacing the material processed in the injection unit into the second injection space through the feed channel of the second injection, further transforming the preform into the blown preform; - cooling of the second component of step j. using refrigeration circuits installed in the mold, and solidification of the injected material to form the second component; - the injection unit of the second component is the same as the injection unit of the preform when the material used for the preform injection is the same as the one used for the second component injection. a. injection of the preform from an auxiliary injection unit adjacent to the mould and moving the processed material from the auxiliary injection unit into the mould through the feed channel of the first injection, which is inserted in the cavity plate and in the cavity; b. cooling the injected material and opening the mould from the partition line; c. aligning the preform on the second injection cavity and moving elements (18 and 24); d. closing the mould in the second injection cavity and triggering the mechanical ramp system from the actuator; e. upward movement of the tubular valve, opening the gas channel and establishing contact between the gas channel and the preform; f. gas injection from a gas injection system into the gas channel and control of the gas pressure; g. blowing the preform; h. cooling the blown preform near the surfaces of the moving elements (18, 24) where the blowing pressure is maintained; i. decompression of the gas existing in the pressurized gas chamber to outside of the mould acting on an air valve; j. cooling the second component; k. opening the mould from the partition line and extracting the piece from the plug; and - blowing the preform of step g. and simultaneously injecting the second component, through an injection unit displacing the material processed in the injection unit into the second injection space through the feed channel of the second injection, further transforming the preform into the blown preform; - cooling of the second component of step j. using refrigeration circuits installed in the mold, and solidification of the injected material to form the second component; - the injection unit of the second component is the same as the injection unit of the preform when the material used for the preform injection is the same as the one used for the second component injection.