Measurement of the boxing travel by the stretching function, in an installation for producing containers
AssigneeSidel Participations
InventorPierrick Protais
Life of this patent
Estimating the term…
Abstract
Disclosed is a method for parametrizing a facility for producing containers including: a mold having a movable mold bottom, a movable drawing rod and an electric machine coupled with the rod; from a configuration in which the rod is in a raised position and in the bottom in an extended position, operating the electric machine as a motor; assessing the resultant of the axial forces on the rod; when a variation is detected in the resultant of the forces, assigning an initial position to the rod; controlling the movement of the mold bottom towards the retracted position thereof; assigning to the rod the corresponding so-called final position of the rod; and calculating the difference between the final position and the initial position.
Claims20
A method using a central control unit with a memory for operating an installation for manufacturing containers by stretch blow molding from blanks made of plastic material, where the installation includes a mold with a wall that defines a cavity bearing an impression of the container and extending along a main axis of the mold and with a mold bottom that is movable axially in relation to the wall between an extended position and a retracted position, a moving device configured to exert an axial thrust on the mold bottom to move the mold bottom from said extended position to said retracted position and vice versa, a stretching device with and electric machine and a stretching rod that is movable axially in relation to the wall, the stretching rod actuated by the electric machine, and a central control unit with a memory and in operative communication with the moving device and the stretching device, said operating method comprising:
- from an initial configuration in which the stretching rod is in a raised position away from the mold bottom and in which the mold bottom is in one of said extended position and said retracted position, controlling the electric machine to operate as a motor to apply an axial driving force on the stretching rod that moves the stretching rod toward the mold bottom;
- evaluating a result of axial forces exerted on the stretching rod;
- on condition that a variation in the result of the forces is detected, determining and storing in the memory of the central control unit a position of origin for the stretching rod;
- controlling the mold bottom to move toward the other of said retracted position and said extended position;
- determining and storing in the memory of the central control unit a corresponding final position for the stretching rod;
- and
- calculating and storing in the memory of the central control unit a travel of the stretching rod as a distance between the final position and the position of origin.
Dependencies are inferred from the claim text.