Apparatus and method for controlling a pressure of a fiber suspension in a headbox or associated fluid conduit
AssigneeVoith Sulzer Paper Technology North America, Inc.
InventorEdwin X. Graf
Life of this patent
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Abstract
The invention is directed to a paper machine including a headbox having an inlet and an outlet. A fluid conduit is connected to the inlet of the headbox. A sensor is disposed in communication with an interior of the headbox. The sensor senses a pressure of the fiber suspension within the headbox and provides a signal corresponding thereto. A first pump is connected to the fluid conduit and supplies a fiber suspension to the headbox through the fluid conduit. A second pump is connected to the fluid conduit between the first pump and the headbox, and further is connected to the sensor. The second pump is a substantially pulseless pump, and transports the fiber suspension away from the fluid conduit, dependent upon the sensed signal.
Claims16
A fiber suspension delivery apparatus, comprising:
- a headbox having an inlet and an outlet;
- a fluid conduit connected to said inlet of said headbox;
- a first pump connected to said fluid conduit for supplying a fiber suspension to said headbox through said fluid conduit;
- a sensor disposed in communication with an interior of one of said headbox and said fluid conduit for sensing a pressure of the fiber suspension and providing a signal corresponding thereto;
- and
- a second pump connected to said fluid conduit between said first pump and said headbox, and further being connected to said sensor, said second pump comprising a substantially pulseless pump, said second pump being configured to transport a variable volume of the fiber suspension away from said fluid conduit, dependent upon said sensed pressure.
A method of controlling a pressure of a fiber suspension in a headbox, said method comprising the steps of:
- providing a headbox having an inlet and an outlet;
- providing a fluid conduit connected to said headbox inlet;
- providing a first pump connected to said fluid conduit;
- providing a second pump connected to said fluid conduit between said first pump and said headbox, said second pump comprising a substantially pulseless pump;
- transporting a fiber suspension to said headbox through said fluid conduit using said first pump;
- sensing a pressure of the fiber suspension in one of the headbox and the fluid conduit using a sensor;
- and
- pumping a variable volume of the fiber suspension away from the fluid conduit with said second pump, dependent upon said sensed pressure.
Dependencies are inferred from the claim text.