EP 0494214 B1 19950809 - PROCESS FOR MANUFACTURING CHEMO-MECHANICAL AND/OR CHEMO-THERMO-MECHANICAL WOOD PULPS.
Title (en)
PROCESS FOR MANUFACTURING CHEMO-MECHANICAL AND/OR CHEMO-THERMO-MECHANICAL WOOD PULPS.
Title (de)
HERSTELLUNG CHEMO-MECHANISCHER UND/ODER CHEMO-THERMO-MECHANISCHER HOLZSTOFFE.
Title (fr)
PROCEDE POUR FABRIQUER DES PATES CHIMIO-MECANIQUES ET/OU CHIMIO-THERMO-MECANIQUES.
Publication
Application
Priority
- DE 3932347 A 19890928
- EP 9001622 W 19900925
Abstract (en)
[origin: US5338405A] PCT No. PCT/EP90/01622 Sec. 371 Date May 18, 1992 Sec. 102(e) Date May 18, 1992 PCT Filed Sep. 25, 1990 PCT Pub. No. WO91/05102 PCT Pub. Date Apr. 18, 1991.In a process for manufacturing chemo-mechanical and/or chemothermal-mechanical wood pulps, raw materials containing lignocellulose, such as wood shavings, wood chips, pre-ground wood or sawdust, are first impregnated with an aqueous alcoholic SO2 solution and then heated to a temperature between 50 DEG and 170 DEG C. for a period of 1 to 300 minutes. The wood shavings are then ground to the desired degree of fineness in a defibrinating device. The process makes it possible to achieve up to 50% reduction in grinding energy in comparison with known chemothermal-mechanical processes.
IPC 1-7
IPC 8 full level
D21B 1/14 (2006.01); D21B 1/16 (2006.01); D21C 1/04 (2006.01); D21C 3/20 (2006.01); D21C 3/22 (2006.01)
CPC (source: EP US)
D21B 1/16 (2013.01 - EP US); D21C 1/04 (2013.01 - EP US); D21C 3/20 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE ES FR GB IT LI NL SE
DOCDB simple family (publication)
WO 9105102 A1 19910418; AT E126294 T1 19950815; CA 2067129 A1 19910329; DE 3932347 A1 19910411; DE 3932347 C2 19930107; DE 59009516 D1 19950914; EP 0494214 A1 19920715; EP 0494214 B1 19950809; ES 2076374 T3 19951101; FI 921305 A0 19920325; FI 921305 A 19920325; JP H05502480 A 19930428; NO 178467 B 19951227; NO 178467 C 19960403; NO 921129 D0 19920323; NO 921129 L 19920323; US 5338405 A 19940816
DOCDB simple family (application)
EP 9001622 W 19900925; AT 90914536 T 19900925; CA 2067129 A 19900925; DE 3932347 A 19890928; DE 59009516 T 19900925; EP 90914536 A 19900925; ES 90914536 T 19900925; FI 921305 A 19920325; JP 51359690 A 19900925; NO 921129 A 19920323; US 84236592 A 19920518