EP 4305975 A4 20240515 - FILTER ROD HAVING HOLLOW OUTER SECTION AND FILLED INNER CORE, AND PROCESSING METHOD THEREFOR
Title (en)
FILTER ROD HAVING HOLLOW OUTER SECTION AND FILLED INNER CORE, AND PROCESSING METHOD THEREFOR
Title (de)
FILTERSTAB MIT HOHLEM AUSSENTEIL UND GEFÜLLTEM INNENKERN UND VERARBEITUNGSVERFAHREN DAFÜR
Title (fr)
BÂTONNET-FILTRE AYANT UNE SECTION EXTERNE CREUSE ET UN NOYAU INTERNE REMPLI, ET SON PROCÉDÉ DE TRAITEMENT
Publication
Application
Priority
- CN 202210568132 A 20220524
- CN 2023080716 W 20230310
Abstract (en)
[origin: EP4305975A1] The present invention discloses an externally-hollow filter stick with a filled core. The filter stick is cylindrical in appearance and is composed of an outer layer which is a cylinder (W1) formed by rolling outer forming paper (W) and an inner layer which is in a cylindrical shape with a cross section being a regular triangle (N1) in an axial direction of the cylinder (W1) formed by folding inner forming paper (N); and three vertexes of the regular triangle (N1) are on an inner wall surface of the cylinder (W1), wherein an interior of the inner forming paper (N) is filled with inner tows (S2). The present invention further discloses a forming method of a triangular filter stick with a filled core.
IPC 8 full level
CPC (source: CN EP)
A24D 3/0229 (2013.01 - CN EP); A24D 3/0254 (2013.01 - CN); A24D 3/0287 (2013.01 - CN); A24D 3/0291 (2013.01 - CN); A24D 3/04 (2013.01 - CN EP); A24D 3/061 (2013.01 - CN); A24D 3/10 (2013.01 - CN)
Citation (search report)
- [A] WO 2019110715 A1 20190613 - ESSENTRA FILTER PRODUCTS DEV CO PTE LTD [SG], et al
- [A] JP 3002173 B2 20000124
- [A] EP 0082734 A2 19830629 - FILTRONA LTD [GB]
- See also references of WO 2023226522A1
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)
EP 4305975 A1 20240117; EP 4305975 A4 20240515; CN 114983017 A 20220902; CN 114983017 B 20230822; WO 2023226522 A1 20231130
DOCDB simple family (application)
EP 23772391 A 20230310; CN 202210568132 A 20220524; CN 2023080716 W 20230310