(19)
(11) EP 4 323 582 A1

(12)

(43) Date of publication:
21.02.2024 Bulletin 2024/08

(21) Application number: 21725859.9

(22) Date of filing: 16.04.2021
(51) International Patent Classification (IPC): 
D21G 9/00(2006.01)
(52) Cooperative Patent Classification (CPC):
D21G 9/0009; D21G 9/0027
(86) International application number:
PCT/US2021/027589
(87) International publication number:
WO 2022/220837 (20.10.2022 Gazette 2022/42)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
KH MA MD TN

(71) Applicant: ABB SCHWEIZ AG
5400 Baden (CH)

(72) Inventors:
  • CHEN, Shih-Chin
    Dublin, Ohio 43017 (US)
  • BUTYNSKI, Mike
    Chillicothe, Ohio 45601 (US)
  • LIU, ChangYuan
    Powell, Ohio 43065 (US)
  • STANLEY, Donald, III
    Powell, Ohio 43065 (US)
  • SCHROEDER, John
    Worthington, Ohio 43085 (US)

(74) Representative: Maiwald GmbH 
Engineering Elisenhof Elisenstrasse 3
80335 München
80335 München (DE)

   


(54) CONTROL OF PAPERMAKING PROCESSES WITH RESPECT TO SQUARE POINT CONDITIONS