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1. (WO1998050169) METHOD AND APPARATUS FOR COATING PAPER BOARD AND PAPER
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1998/050169 International Application No.: PCT/US1998/009314
Publication Date: 12.11.1998 International Filing Date: 07.05.1998
Chapter 2 Demand Filed: 09.10.1998
IPC:
D21H 23/32 (2006.01) ,D21H 25/08 (2006.01)
D TEXTILES; PAPER
21
PAPER-MAKING; PRODUCTION OF CELLULOSE
H
PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C, D21D84; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G97; PAPER NOT OTHERWISE PROVIDED FOR
23
Processes or apparatus for adding material to the pulp or to the paper
02
characterised by the manner in which substances are added
22
Addition to the formed paper
32
by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
D TEXTILES; PAPER
21
PAPER-MAKING; PRODUCTION OF CELLULOSE
H
PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C, D21D84; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G97; PAPER NOT OTHERWISE PROVIDED FOR
25
After-treatment of paper not provided for in groups D21H17/-D21H23/104
08
Rearranging applied substances, e.g. metering, smoothing; Removing excess material
Applicants:
VALMET CORPORATION [FI/FI]; Panuntie 6 FIN-00620 Helsinki, FI (AllExceptUS)
LEINO, Mika [FI/FI]; FI (UsOnly)
RENVALL, Stig [FI/US]; US (UsOnly)
KUNI, Stefan [FI/FI]; FI (UsOnly)
PALOVIITA, Petri [FI/US]; US (UsOnly)
Inventors:
LEINO, Mika; FI
RENVALL, Stig; US
KUNI, Stefan; FI
PALOVIITA, Petri; US
Agent:
STUART, Michael, C.; Cohen, Pontani, Lieberman & Pavane Suite 1210 551 Fifth Avenue New York, NY 10176, US
Priority Data:
60/046,13409.05.1997US
Title (EN) METHOD AND APPARATUS FOR COATING PAPER BOARD AND PAPER
(FR) PROCEDE ET APPAREIL DE COUCHAGE DE CARTON ET DE PAPIER
Abstract:
(EN) A method and apparatus for coating a paper or a paper board web (5), comprising spreading coating mix having a solids content of 55 to 75 % on the surface of the web (5) with a nozzle applicator (3, 9), levelling and metering the spread coating mix on the surface of the web by a doctor element (7) capable of producing a high hydrodynamic force on the contacting layer between the doctor element (7) and the web (5), the doctor element (7) being located downstream of the applicator (3, 9) so that the dwell time between the spreading of the coating mix to the metering is 72-2400 ms. The web speed is preferably 100-1000 m/s. A good smoothness and coverage is achieved by this method due to long dwell time.
(FR) Cette invention se rapporte à un procédé et à un appareil de couchage d'une bande (5) de papier ou de carton, qui consiste à étaler à la surface de la bande (5) une sauce de couchage comportant une teneur en éléments solides comprise entre 55 et 75 %, au moyen d'un applicateur à tuyère (3, 9), à araser et à doser la sauce de couchage étalée à la surface de la bande au moyen d'une racle (7) susceptible de produire une force hydrodynamique élevée sur la couche de contact entre la racle (7) et la bande (5), ladite racle (7) étant disposée en aval de l'applicateur (3, 9) de sorte que la durée de séjour écoulée entre l'étalement de la sauce de couchage et le dosage est comprise entre 72 et 2400 ms. La vitesse de la bande est de préférence comprise entre 100 et 1000 m/s. Ce procédé permet d'obtenir un bon lissé du papier et un bon rendement superficiel spécifique en raison de l'importance de la durée de séjour.
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Designated States: AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, CA, CH, CN, CU, CZ, DE, DK, EE, ES, FI, GB, GE, HU, IL, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, TJ, TM, TR, TT, UA, UG, US, UZ, VN
African Regional Intellectual Property Organization (ARIPO) (GH, GM, KE, LS, MW, SD, SZ, UG, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
AT19989046US6306461CA2288113AU1998074736