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1. (EP0530251) NONWOVEN FILTER AND METHOD OF MANUFACTURE.

Office : European Patent Office
Application Number: 91909600 Application Date: 02.05.1991
Publication Number: 0530251 Publication Date: 10.03.1993
Publication Kind : B1
Designated States: AT, BE, CH, DE, DK, ES, FR, GB, IT, LI, NL, SE
Prior PCT appl.: Application Number:US1991003017 ; Publication Number: Click to see the data
IPC:
A24D 3/02
A24D 3/04
A24D 3/08
B01D 39/00
B01D 39/16
B29C 55/06
D04H 1/56
A HUMAN NECESSITIES
24
TOBACCO; CIGARS; CIGARETTES; SMOKERS' REQUISITES
D
CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
3
Tobacco smoke filters, e.g. filter-tips, filtering inserts; Mouthpieces for cigars or cigarettes
02
Manufacture of tobacco smoke filters
A HUMAN NECESSITIES
24
TOBACCO; CIGARS; CIGARETTES; SMOKERS' REQUISITES
D
CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
3
Tobacco smoke filters, e.g. filter-tips, filtering inserts; Mouthpieces for cigars or cigarettes
04
Tobacco smoke filters characterised by their shape or structure
A HUMAN NECESSITIES
24
TOBACCO; CIGARS; CIGARETTES; SMOKERS' REQUISITES
D
CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
3
Tobacco smoke filters, e.g. filter-tips, filtering inserts; Mouthpieces for cigars or cigarettes
06
Use of materials for tobacco smoke filters
08
of organic materials as carrier or major constituent
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
D
SEPARATION
39
Filtering material for liquid or gaseous fluids
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
D
SEPARATION
39
Filtering material for liquid or gaseous fluids
14
Other self-supporting filtering material
16
of organic material, e.g. synthetic fibres
B PERFORMING OPERATIONS; TRANSPORTING
29
WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
C
SHAPING OR JOINING OF PLASTICS; SHAPING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; AFTER- TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
55
Shaping by stretching, e.g. drawing through a die; Apparatus therefor
02
of plates or sheets
04
uniaxial, e.g. oblique
06
parallel with the direction of feed
D TEXTILES; PAPER
04
BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
H
MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING
1
Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
40
from fleeces or layers composed of fibres without existing or potential cohesive properties
54
by welding together the fibres, e.g. by partially melting or dissolving
56
in association with fibre formation, e.g. immediately following extrusion of staple fibres
CPC:
A24D 3/0233
B01D 39/1623
B01D 2239/10
B29C 55/06
D04H 1/56
Y10S 55/05
Applicants:
Inventors: National Oilwell Varco, L.P.
Priority Data: 51913290 04.05.1990 US
9103017 02.05.1991 US
Title: (DE) VLIESSTOFFILTER UND VERFAHREN ZUR HERSTELLUNG.
(EN) NONWOVEN FILTER AND METHOD OF MANUFACTURE.
(FR) FILTRE NON TISSE ET PROCEDE DE FABRICATION.
Abstract: front page image
(EN) A filter useful as a cigarette smoke filter is made by convergingly passing a flat restrained meltblown web successively through a heated zone (36) and a trumpet (24) to form a roving (25). The roving may be processed to make filters. The process results in stretch orientation of longitudinal fibers and bulking due to cross fibers. Primary and secondary pleats formed in the web are bundled into a cylindrical roving. The pleats add bulking to the web and provide fluid permeability through the filter.
(FR) La fabrication d'un filtre utilisé comme filtre de fumée de cigarette consiste à faire passer de manière convergente une bande serrée plane dilatée par fusion successivement dans une zone chauffée (36) et une trompette (24) afin de former une mèche (25). On peut traiter la mèche afin de fabriquer des filtres. Le procédé a pour résultat une orientation d'allongement de fibres longitudinales ainsi qu'un gonflement dû à des fibres transversales. Des plis primaires et secondaires formés dans la bande sont mis en paquet dans une mèche cylindrique. Les plis ajoutent du volume à la bande et ils permettent d'obtenir une perméabilité au fluide à travers le filtre.
Also published as:
JPH05506809CA2082058KR1019930700723AU1991078598MYPI 91000743WO/1991/017297