EP 0541457 A1 19930512 - Apparatus and method for the on-line control of the filler content of a paper product.
Title (en)
Apparatus and method for the on-line control of the filler content of a paper product.
Title (de)
Vorrichtung und Verfahren zur On-Line-Steuerung des Füllstoffanteils einer Papierbahn.
Title (fr)
Appareil et procédé pour le contrÔle on-line de la teneur en charge d'une bande de papier.
Publication
Application
Priority
US 78718791 A 19911104
Abstract (en)
Apparatus and method for controlling on-line the weight percent of filler in the paper product of a papermaking system, the method comprising: providing a stock slurry to the system, the stock slurry comprising a mixture of water and pulp fibers; introducing the recyclable solution to the system, the recyclable solution comprising a mixture of water, pulp fibers, and filler; mixing the stock slurry and the recyclable solution, thereby forming the system slurry; introducing the system slurry to the headbox (19) and distributing the system slurry therefrom to the means for draining (22); draining solution from the system slurry to thereby form the recyclable solution, and to thereby also form the concentrated system product for processing to form the paper product; computing the concentration of total solids in the system slurry at the headbox; measuring the concentration of total solids in the system slurry at the headbox; computing the weight percent of filler in the system slurry as a function of the computed concentration of total solids in the system slurry and the measurement of concentration of total solids in the system slurry; measuring the total solids concentration of the recyclable solution; computing first pass filler retention as a function of the measurement of concentration of total solids in the system slurry and the measurement of the total solids concentration of the recyclable solution, computing the weight percent of filler in the paper product as a function of the weight percent of filler in the system slurry and the first pass filler retention; comparing the computed weight percent of filler in the paper product to a desired such value of weight percent of filler in the paper product and computing the amount and flow rate of additional filler to add to the system slurry; and adjusting and controlling the amount and flow rate of the additional filler to the system slurry, thereby controlling the weight percent of filler in the paper product of the system. <IMAGE>
IPC 1-7
IPC 8 full level
D21F 1/06 (2006.01); D21F 1/08 (2006.01); D21F 1/66 (2006.01); D21G 9/00 (2006.01)
CPC (source: EP)
D21F 1/66 (2013.01); D21G 9/0027 (2013.01)
Citation (search report)
- [A] US 4098641 A 19780704 - CASEY JOSEPH M, et al
- [A] US 3035967 A 19620522 - SACKSEN PETER K, et al
- [A] KORTELAINEN H., ET AL.: "MILL APPLICATION OF A NEW SYSTEM THAT SIMULTANEOUSLY MONITORS FIBERRETENTION AND FILTER RETENTION.", TAPPI JOURNAL., TECHNICAL ASSOCIATION OF THE PULP & PAPER INDUSTRY. ATLANTA., US, vol. 72., no. 08., 1 August 1989 (1989-08-01), US, pages 113 - 119., XP000069041, ISSN: 0734-1415
- [A] PROC. IEE vol. 116, no. 10, October 1969, NEW YORK pages 1755 - 1758 SIDEBOTTOM 'computer control of paper-making plant'
- [A] MEASUREMENT AND CONTROL vol. 1, no. 8, August 1968, pages 287 - 291 JONES, WHIGHT 'the digital control of a fourdrinier paper machine'
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 0541457 A1 19930512; CA 2081581 A1 19930505; JP H05239786 A 19930917
DOCDB simple family (application)
EP 92420382 A 19921027; CA 2081581 A 19921028; JP 29527792 A 19921104