EP 0561256 A1 19930922 - Method in contact-free air-drying of a material web as well as a nozzle-blow-box and a pulp dryer that make use of the method.
Title (en)
Method in contact-free air-drying of a material web as well as a nozzle-blow-box and a pulp dryer that make use of the method.
Title (de)
Verfahren zum Lufttrocknen von freigeführten Materialbahnen sowie Blasluftdüse und Papiertrockner zur Durchführung des Verfahrens.
Title (fr)
Procédé pour le séchage sans contact par l'air chaud d'une bande ainsi qu'un ciasson d'insufflation et un séchoir pour papier utilisant le procédé.
Publication
Application
Priority
FI 921193 A 19920319
Abstract (en)
The invention concerns a method in air-drying of material webs, in particular of material webs of relatively high grammage, such as pulp webs. Also, the invention concerns a nozzle-blow-box and a pulp dryer that make use of the method. To the web (W) to be dried, from underneath the web, air blowings (B2) substantially perpendicular to the web and air blowings (B3) substantially parallel to the plane of the web (W) are applied. By means of these blowings (B2,B3), both heat is transferred to the web (W) and the web is supported by air free of contact, and the run of the web through the dryer is stabilized. In order to improve the transfer of heat in comparison with a plane carrier face (FIG. 7C; 31c), the air flow velocity parallel to the plane of the web (W) to be dried and air-supported in connection with the nozzle-carrier face (31) is initially (34) kept substantially invariable, whereupon the air flow velocity is lowered in the lateral areas (35;35b;35d;35e) of said carrier face (31) by employing lateral areas (35, 35b,35e) of the nozzle-carrier face (31) that become rampwise and/or stepwise lower in the air-flow direction. <IMAGE>
IPC 1-7
IPC 8 full level
F26B 21/00 (2006.01); D21F 5/18 (2006.01); F26B 13/20 (2006.01)
CPC (source: EP KR)
D21F 5/188 (2013.01 - EP KR); F26B 13/104 (2013.01 - EP KR)
Citation (search report)
- [Y] WO 8808950 A1 19881117 - KRIEGER KURT [DE]
- [Y] DE 1143474 B 19630214 - ARTOS MEIER WINDHORST KG
- [A] US 3982328 A 19760928 - GUSTAFSSON RUNE, et al
- [A] US 3272415 A 19660913 - SVEN WALLIN
- [A] EP 0195757 A1 19860924 - FLAEKT AB [SE]
- [A] EP 0298299 A1 19890111 - VITS HILMAR
Designated contracting state (EPC)
AT CH DE ES FR GB IT LI PT SE
DOCDB simple family (publication)
EP 0561256 A1 19930922; EP 0561256 B1 20010711; AT E203071 T1 20010715; BR 9301228 A 19930921; CA 2092004 A1 19930920; CA 2092004 C 19980519; CN 1031656 C 19960424; CN 1081485 A 19940202; DE 69330413 D1 20010816; DE 69330413 T2 20020620; ES 2159510 T3 20011016; FI 921193 A0 19920319; FI 921193 A 19930920; FI 92421 B 19940729; JP 3305802 B2 20020724; JP H06248593 A 19940906; KR 0172974 B1 19990330; KR 930019930 A 19931019
DOCDB simple family (application)
EP 93103768 A 19930309; AT 93103768 T 19930309; BR 9301228 A 19930318; CA 2092004 A 19930318; CN 93104033 A 19930319; DE 69330413 T 19930309; ES 93103768 T 19930309; FI 921193 A 19920319; JP 8388893 A 19930319; KR 930004138 A 19930318