EP 4168614 A1 20230426 - METHOD FOR PRODUCING A FIBROUS WEB CONTAINING POLYLACTIDE FIBRES
Title (en)
METHOD FOR PRODUCING A FIBROUS WEB CONTAINING POLYLACTIDE FIBRES
Title (de)
VERFAHREN ZUR HERSTELLUNG EINER FASERSTOFFBAHN MIT POLYLACTID-FASERN
Title (fr)
PROCÉDÉ PERMETTANT DE PRODUIRE UNE BANDE FIBREUSE CONTENANT DES FIBRES DE POLYLACTIDE
Publication
Application
Priority
- DE 102020116399 A 20200622
- DE 2021100525 W 20210618
Abstract (en)
[origin: WO2021259420A1] The invention relates to a method for producing a fibrous web containing polylactide fibres and, as necessary, other fibres, in which (a) a fibrous ply containing polylactide fibres and, as necessary, other fibres are laid on a substrate in a random fibre arrangement, (b) initially a loose, pre-compressed nonwoven is created by applying a first pressure to the fibrous ply, the tear resistance of which nonwoven permits free bridging of a span between 0.1 m and 1 m before the nonwoven tears, (c) the pre-compressed nonwoven is then passed through the calender gap, wherein a pattern consisting of point or linear pressure zones is formed in the gap, with the fibres in the pressure zones being exposed to a second pressure, which is higher than the first pressure, and to a temperature such that the fibres fuse. Biodegradable fibrous webs, containing polylactide fibres and, as necessary, other fibres, can be produced having a good resistance to moisture, even in a mixture with other fibres, for example cellulose fibres. It is also possible to transfer the fibrous web into a dimensionally stable three-dimensional form.
IPC 8 full level
D04H 1/425 (2012.01); B01D 39/16 (2006.01); B01D 39/18 (2006.01); D04H 1/435 (2012.01); D04H 1/54 (2012.01); D04H 1/55 (2012.01); D04H 1/732 (2012.01); F16L 9/14 (2006.01)
CPC (source: EP KR US)
B01D 39/163 (2013.01 - EP); B01D 39/18 (2013.01 - EP); D04H 1/425 (2013.01 - EP); D04H 1/435 (2013.01 - EP); D04H 1/43835 (2020.05 - KR); D04H 1/54 (2013.01 - EP); D04H 1/55 (2013.01 - EP KR US); D04H 1/551 (2013.01 - US); D04H 1/732 (2013.01 - EP KR US); B01D 2239/064 (2013.01 - EP); B01D 2239/1233 (2013.01 - EP); D10B 2201/01 (2013.01 - US); D10B 2401/041 (2013.01 - US); D10B 2401/062 (2013.01 - US); D10B 2505/04 (2013.01 - KR); D10B 2505/06 (2013.01 - KR); F16L 9/14 (2013.01 - EP); F16L 9/21 (2013.01 - EP); F16L 59/021 (2013.01 - EP)
Citation (search report)
See references of WO 2021259420A1
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 102020116399 A1 20211223; EP 4168614 A1 20230426; KR 20230047083 A 20230406; MX 2022015491 A 20230118; US 2023203725 A1 20230629; WO 2021259420 A1 20211230
DOCDB simple family (application)
DE 102020116399 A 20200622; DE 2021100525 W 20210618; EP 21739548 A 20210618; KR 20237002477 A 20210618; MX 2022015491 A 20210618; US 202118011216 A 20210618