The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 18, 2000
Filed:
Jun. 08, 1998
Claud Hagart-Alexander, Vancouver, CA;
Hung-Tzaw Hu, Saratoga, CA (US);
David Watson, Etobicoke, CA;
John Preston, Los Altos, CA (US);
Honeywell-Measurex Corporation, Cupertino, CA (US);
Abstract
System and method for producing paper are provided. The system controls formation of wet stock comprising fibers on a moving water permeable wire of a de-watering machine that has a refiner that is subject to a variable load and a headbox having at least one slice, wherein each slice has an aperture through which wet stock is discharged at a stock jet speed onto the wire that is moving at a wire speed. A sheet of wet stock moving a speed develops on the wire. The system includes: a) at least two water weight sensors that are positioned adjacent to the wire wherein the at least two sensors are positioned at different locations in the direction of movement of the wire and upstream from a dry line which develops during operation of the machine and the sensors generate signals indicative of a water weight profile made up of a multiplicity of water weight measurements; and b) means for adjusting at least one of the stock jet speed, sheet speed, wire speed, or refiner load to cause the water weight profile to match a preselected or optimal water weight profile. Techniques for predicting the dry stock weight of wet stock on the wire can be employed to assess the effect of adjusting the operating parameters. In addition, employing two sensors placed in the machine direction, the sheet speed can be determined by measuring the water weigh profile of a segment of the sheet and the time required for the segment to travel from one sensor to the next.