Method of controlling tension in a moving web material
AssigneeThe Procter & Gamble Company
InventorsMichael J. Franz, Brian C. Schwamberger, Matthew D. Dooley
Life of this patent
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Abstract
A method of dynamically controlling the tension of a moving web material. A web material is transported with an apparatus. A modulus-of-elasticity-analog value is determined for the web material. The modulus-of-elasticity-analog value is used to adjust an instantaneous gain of the web control system. The instantaneous gain is used in the control calculation of the control system. The control calculation is used to control the speed of a web handling drive. Controlling the speed of at least one appropriate web handling drive controls the tension of the web.
Claims16
A method of controlling tension in a moving web material, the method comprising steps of:
- a) determining a modulus-of-elasticity-analog value of the moving web material,
- b) determining a web-tension-analog value of the moving web material,
- c) determining a web-tension error signal for the moving web,
- d) determining a web-velocity-analog value for the moving web,
- e) adjusting a control system gain according to the modulus-of-elasticity-analog value of the moving web material,
- f) adjusting an integral gain of the controller according to the web-velocity-analog value,
- g) adjusting a system output according to the web-tension-error signal and the integral gain of the controller, and
- h) adjusting a speed of a web drive according to the control system gain.
A method of adjusting an output in a process for handling a moving web material, the method comprising the steps of:
- a) determining an error signal,
- b) determining a web-velocity-analog value,
- c) determining an instantaneous integral gain according to the web-velocity-analog value,
- d) determining a modulus-of-elasticity-analog value,
- e) determining an instantaneous proportional gain according to the modulus-of-elasticity-analog value, and
- f) adjusting the output according to the error signal, the instantaneous integral gain and the instantaneous proportional gain.
A method of controlling a process for handling a material having a web-velocity-analog value, and a web-tension-analog value, the method comprising the steps of:
- a) determining a tension set-point value,
- b) determining the web-tension-analog value,
- c) determining a tension error,
- d) determining the web-velocity-analog value,
- e) determining an instantaneous integral gain according to the web-velocity-analog value,
- f) determining a modulus-of-elasticity-analog value,
- g) determining an instantaneous proportional gain according to the modulus-of-elasticity-analog value, and
- h) adjusting the output according to the tension error, the instantaneous proportional gain, and the instantaneous integral gain.
Dependencies are inferred from the claim text.