(19)
(11) EP 0 354 889 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
07.08.1991 Bulletin 1991/32

(43) Date of publication A2:
14.02.1990 Bulletin 1990/07

(21) Application number: 89850245.5

(22) Date of filing: 03.08.1989
(51) International Patent Classification (IPC)5: D21H 21/02, D21H 17/44, D21C 9/08, D21H 21/04
(84) Designated Contracting States:
AT BE CH DE ES FR GB IT LI NL SE

(30) Priority: 11.08.1988 SE 8802873

(71) Applicant: W.R. GRACE & CO.
New York New York 10036 (US)

(72) Inventor:
  • Kornebäck, Kjell Ingemar
    S-608 78 Norrköping (SE)

(74) Representative: Henningsson, Gunnar et al
AWAPATENT AB, Box 45086
S-104 30 Stockholm
S-104 30 Stockholm (SE)


(56) References cited: : 
   
       


    (54) A method of controlling microbiological deposits on paper making equipment and paper obtained thereby


    (57) The invention relates to a method of controlling productivi­ty disturbing microbiological deposits, e.g. slime, on paper mak­ing equipment, which method is characterized by applying to any locus or surface of said equipment a deposition-controlling amount, preferably at least about 0.1 parts per million of dilu­tion water, of a cationic polymer or a cationic surfactant or a mixture thereof.
    Said application is preferably performed by spraying an aqueous solution of said polymer or surfactant directly onto the equipment to be cleaned.
    The invention also relates to the improved paper prepared by such a method.





    Search report