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US 7,004,745 B2Granted
Stretch blow molding machine having improved control of the stretch rod
AssigneeSidel
InventorBruno Galloni
Life of this patent
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Abstract
A machine for making thermoplastic containers by stretching and blowing a preform including at least a stretch rod which is slidably controlled along its axis by an actuator from a retracted position to a stretching position to stretch the preform during the blowing process. When the stretch rod returns toward its retracted position, the actuator is idle, such that the stretch rod is returned by a blowing pressure prevailing inside the container being produced so as to act on a working end of the stretch rod.
Claims8
A machine for manufacture of thermoplastic containers comprising:
- at least one stretch rod that is slidably controlled along its axis;
- and
- an actuator associated with the at least one stretch rod, said actuator causing the at least one stretch rod to slide along its axis from a retracted position to a stretching position,
- wherein the at least one stretch rod is operable to be returned to its retracted position by a blow pressure of a container being blow-molded, and
- the actuator is in a state of rest while the stretch rod is returned to its retracted position.
2 more elements
Dependencies are inferred from the claim text.