EP 0688373 B1 19961009 - PROCESS TO PRODUCE CHEMI-MECHANICAL PULP AND/OR CHEMI-THERMO-MECHANICAL PULP
Title (en)
PROCESS TO PRODUCE CHEMI-MECHANICAL PULP AND/OR CHEMI-THERMO-MECHANICAL PULP
Title (de)
HERSTELLUNG CHEMO-MECHANISCHER UND/ODER CHEMO-THERMO-MECHANISCHER HOLZSTOFFE
Title (fr)
PRODUCTION DE PATES A PAPIER CHIMIO-MECANIQUES ET/OU CHIMIO-THERMO MECANIQUES
Publication
Application
Priority
- DE 4307660 A 19930311
- EP 9400627 W 19940303
Abstract (en)
[origin: WO9420670A1] A process is disclosed for producing chemomechanical and/or chemothermomechanical wood products from lignocellulosic raw materials, such as wood chips. The raw materials are impregnated with a SO2-containing solution and then subjected to a sulfonating reaction in a gaseous or vapour phase at a pH value equal to 2 or less. When the sulfonating reaction is finished, the raw materials or wood chips are defibrated in a defibrating unit known per se and are crushed down to a preselected fineness degree. The wood product thus obtained is characterized by remarkable solidity and by requiring a reduced specific crushing energy.
IPC 1-7
IPC 8 full level
D21B 1/14 (2006.01); D21B 1/16 (2006.01); D21C 1/04 (2006.01); D21C 3/06 (2006.01)
CPC (source: EP)
D21B 1/16 (2013.01); D21C 1/04 (2013.01); D21C 3/06 (2013.01)
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB IT LI NL SE
DOCDB simple family (publication)
WO 9420670 A1 19940915; AT E144011 T1 19961015; CA 2157886 A1 19940915; DE 4307660 C1 19940804; DE 59400830 D1 19961114; DK 0688373 T3 19970324; EP 0688373 A1 19951227; EP 0688373 B1 19961009; ES 2095755 T3 19970216; FI 954231 A0 19950908; FI 954231 A 19950908; JP H08507333 A 19960806; NO 953389 D0 19950829; NO 953389 L 19950829
DOCDB simple family (application)
EP 9400627 W 19940303; AT 94910362 T 19940303; CA 2157886 A 19940303; DE 4307660 A 19930311; DE 59400830 T 19940303; DK 94910362 T 19940303; EP 94910362 A 19940303; ES 94910362 T 19940303; FI 954231 A 19950908; JP 51957294 A 19940303; NO 953389 A 19950829