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US 4,290,986 AGranted
Method for controlling a plastic extruder
AssigneeOwens-Illinois, Inc.
InventorJohn E. Koschmann
Life of this patent
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AssigneeOwens-Illinois, Inc.
InventorJohn E. Koschmann
Estimating the term…
A control system for a plastic extruder which automatically controls both the melt pressure and the melt temperature of the plastic material at the outlet of the extruder barrel. The extruder barrel is divided into a plurality of heating zones and a zone temperature control means individually controls the temperature of each zone in accordance with predetermined zone temperature set points. A melt temperature control means automatically adjusts certain zone temperature set points such that the actual melt temperature is maintained at its desired value. The speed of a rotatable extruder screw is controlled by a melt pressure control means such that the actual melt pressure is maintained at its desired value. In accordance with the present invention, a separate feedforward controller and separate feedback controller are provided in the melt temperature control loop and in each zone temperature control loop such that independent specification of set point and disturbance responses can be achieved. Also, the melt temperature control means and the melt pressure control means are each provided with an interaction controller such that the interactions between melt temperature and melt pressure are minimized.
A method for controlling the temperature at a predetermined point in an extruder apparatus having a barrel including a rotatable screw for moving extrusion material from an inlet to an outlet of the barrel and through a die attached to the barrel at the outlet comprising the steps of:
The method of controlling the temperature of extrusion material at a point in an extruder apparatus adjacent an outlet of a barrel including a rotatable screw for moving extrusion material from an inlet to the outlet of the barrel comprising the steps of:
A method for controlling the temperature of an extrusion material in an extruder apparatus having a barrel including a rotatable screw for moving the extrusion material from an inlet to an outlet of the barrel comprising the steps of:
Dependencies are inferred from the claim text.