EP 4389964 A1 20240626 - METHOD FOR PRODUCING HT-CTMP HAVING HIGH TENSILE STRENGTH
Title (en)
METHOD FOR PRODUCING HT-CTMP HAVING HIGH TENSILE STRENGTH
Title (de)
VERFAHREN ZUR HERSTELLUNG VON HT-CTMP MIT HOHER ZUGFESTIGKEIT
Title (fr)
PROCÉDÉ DE PRODUCTION DE HT-CTMP AYANT UNE RÉSISTANCE À LA TRACTION ÉLEVÉE
Publication
Application
Priority
EP 22215619 A 20221221
Abstract (en)
There is provided a bleached high temperature chemithermomechanical pulp and a method for producing said HT-CTMP comprising the steps:a) providing wood chips comprising softwood, hardwood or mixtures thereof;b) impregnating the wood chips with an impregnation liquid to obtain impregnated chips;c) transferring the impregnated chips to a heating zone without compressing the impregnated chips;d) heating the impregnated chips in the heating zone with steam having a temperature of above 140 °C, such as at least 150 °C, such as at least 160 °C, to obtain pre-treated chips;e) defibrating the pre-treated chips to obtain a pulp;f) bleaching the pulp to obtain a bleached pulp; andg) refining the bleached pulp at a consistency of 3-8 wt. % to obtain bleached HT-CTMP.
IPC 8 full level
D21C 1/02 (2006.01); D21B 1/02 (2006.01); D21B 1/14 (2006.01); D21C 1/06 (2006.01); D21C 9/10 (2006.01); D21H 11/02 (2006.01)
CPC (source: EP)
D21B 1/021 (2013.01); D21B 1/12 (2013.01); D21C 1/02 (2013.01); D21C 1/06 (2013.01); D21C 9/10 (2013.01); D21D 1/20 (2013.01); D21H 11/02 (2013.01)
Citation (search report)
- [XI] US 4798651 A 19890117 - KOKTA BOHUSLAV [CA]
- [XI] WO 03000982 A1 20030103 - HOLMEN AKTIEBOLAG [SE], et al
- [I] US 4486267 A 19841204 - PRUSAS ZENON C [US]
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
DOCDB simple family (application)
EP 22215619 A 20221221; EP 2023086916 W 20231220