EP 4179142 A1 20230517 - METHOD FOR PRODUCING WET-RUNNING FRICTION PAPER
Title (en)
METHOD FOR PRODUCING WET-RUNNING FRICTION PAPER
Title (de)
VERFAHREN ZUR HERSTELLUNG VON NASSLAUFREIBPAPIER
Title (fr)
PROCÉDÉ DE PRODUCTION DE PAPIER À FRICTION HUMIDE
Publication
Application
Priority
- DE 102020118410 A 20200713
- DE 102020123040 A 20200903
- DE 2021100496 W 20210609
Abstract (en)
[origin: WO2022012708A1] The invention relates to a method for producing a wet-running friction paper, at least containing a fiber fraction consisting of at least one type of fiber, a fraction of at least one filler, and a fraction of a binder based on phenol resin. In order to propose an improved wet-running friction paper, which has in particular improved adhesion properties, the fiber fraction, the filler fraction and the binder dissolved as a phenolate solution are processed together in a paper production process to form a pulp, and the binder is subsequently precipitated by means of a precipitating agent, preferably diluted sulfuric acid, and the pulp applied to a long screen is dried and cured while the temperature is raised.
IPC 8 full level
D21H 17/48 (2006.01); D21H 17/67 (2006.01); D21H 21/18 (2006.01); D21H 27/28 (2006.01)
CPC (source: EP US)
D21H 17/48 (2013.01 - EP US); D21H 17/67 (2013.01 - EP); D21H 21/18 (2013.01 - EP US); D21H 23/08 (2013.01 - US); D21H 27/28 (2013.01 - EP US); D21H 17/67 (2013.01 - 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 MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
DE 102020123040 A1 20220113; CN 115702276 A 20230214; EP 4179142 A1 20230517; JP 2023534670 A 20230810; JP 7516650 B2 20240716; US 2024035235 A1 20240201; WO 2022012708 A1 20220120
DOCDB simple family (application)
DE 102020123040 A 20200903; CN 202180043895 A 20210609; DE 2021100496 W 20210609; EP 21734272 A 20210609; JP 2023501808 A 20210609; US 202118005185 A 20210609