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1. WO2000040323 - LAYERED FILTERING STRUCTURE

Publication Number WO/2000/040323
Publication Date 13.07.2000
International Application No. PCT/EP1999/009719
International Filing Date 09.12.1999
Chapter 2 Demand Filed 13.07.2000
IPC
B01D 39/20 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
39Filtering material for liquid or gaseous fluids
14Other self-supporting filtering material
20of inorganic material, e.g. asbestos paper or metallic filtering material of non-woven wires
CPC
B01D 39/14
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
39Filtering material for liquid or gaseous fluids
14Other self-supporting filtering material ; ; Other filtering material
B01D 39/2044
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
39Filtering material for liquid or gaseous fluids
14Other self-supporting filtering material ; ; Other filtering material
20of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
2027Metallic material
2041the material being filamentary or fibrous
2044sintered or bonded by inorganic agents
Y10T 428/12035
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
10TECHNICAL SUBJECTS COVERED BY FORMER USPC
TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
428Stock material or miscellaneous articles
12All metal or with adjacent metals
12014having metal particles
12028Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, etc.]
12035Fiber, asbestos, or cellulose in or next to particulate component
Y10T 428/12493
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
10TECHNICAL SUBJECTS COVERED BY FORMER USPC
TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
428Stock material or miscellaneous articles
12All metal or with adjacent metals
12493Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
Applicants
  • N.V. BEKAERT S.A. [BE/BE]; Bekaertstraat 2 B-8550 Zwevegem, BE (AllExceptUS)
  • LONCKE, Jan [BE/BE]; BE (UsOnly)
  • VANDAMME, Johan [BE/BE]; BE (UsOnly)
Inventors
  • LONCKE, Jan; BE
  • VANDAMME, Johan; BE
Agents
  • HEYDE, Katrien; 4011 - D.I.E. Bekaertstraat 2 B-8550 Zwevegem, BE
  • MESSELY, Marc; N.V. Bekaert S.A. Bekaertstraat 2 B-8550 Zwevegem, BE
Priority Data
99200036.408.01.1999EP
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) LAYERED FILTERING STRUCTURE
(FR) STRUCTURE FILTRANTE STRATIFIEE
Abstract
(EN)
A layered filtering structure (10) comprises at least a first layer (12) and a second layer (13). Each layer comprises a web of metal fibers which has been sintered. The two layers (12, 13) are in contact with each other. The first layer, most close to the filter inlet side has a porosity below 55 %, and the second layer, closer to the filter outlet side has a porosity which is at least 20 % greater than the porosity of the first layer. The first layer is compacted in a separate manufacturing step. The layered filtering structure combines the advantage of a small filter rating with a low pressure drop.
(FR)
Une structure filtrante stratifiée (10) comprend au moins une première couche (12) et une deuxième couche (13). Chaque couche comprend une bande de fibres métalliques ayant été préalablement frittées. Les deux couches (12, 13) sont en contact l'une avec l'autre. La première couche, qui est la plus proche du côté entrée du filtre présente une porosité inférieure à 55 %, et la deuxième couche, plus proche du côté sortie du filtre présente une porosité d'au moins 20 % supérieure à celle de la première couche. La première couche est compactée dans une étape de fabrication séparée. La structure filtrante stratifiée de l'invention combine, entre autres, deux avantages : une capacité de filtrage de petites particules et une perte de charge faible.
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