# US 6,719,148 B2 · Filter cloth and replaceable filter module

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- Number: US 6,719,148 B2
- Document ID: US6719148B2
- Status: Granted
- Kind: B2
- Application number: 09/986,422
- Filed: 2001-11-08
- Published: 2002-05-09
- Granted: 2004-04-13
- Earliest claimed: 1999-06-16
- Assignees: Tamfelt Oyj Abp
- Inventors: Aulis Perälä
- Web page: https://patentgrep.com/patent/US6719148B2

## CPC

- B01D 39/08: Filter cloth, i.e. woven, knitted or interlaced material (metallic B01D39/10)
- B01D 2239/0208: Single-component fibres
- B01D 2239/0216: Bicomponent or multicomponent fibres
- B01D 2239/0478: on a layer of the filter
- B01D 2239/065: More than one layer present in the filtering material
- B01D 2239/0659: The layers being joined by needling
- B01D 2239/0663: The layers being joined by hydro-entangling
- B01D 2239/1233: Fibre diameter
- B01D 2239/1241: Particle diameter
- Y10T 442/322: Warp differs from weft
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A filter cloth whose underside comprises substantially parallel, additional yarns that are thicker than the rest of the yarns of the cloth, substantially parallel channels being formed between the yarns, wherein filtered liquid that passed through the cloth, is allowed to flow in the direction of the surface of a filtering element between the filtering portion of the cloth and the surface of the element. The invention further relates to a filtering module manufactured from the filter cloth of the invention.

## Claims

### Claim 1

A filter cloth composed of a plurality of yarns in the transverse and the longitudinal directions, the filter cloth comprising a filtering portion having a structure and density according to desired filtering characteristics for separating liquid from a mixture consisting of solids and liquid, and which filter cloth is further to be arranged against a filtering element in a filtering apparatus, and an underside of the filter cloth, i.e., a portion facing the filtering element, comprises substantially parallel yarns that are thicker than the rest of the yarns of the cloth, and that the thicker yarns are placed at predetermined intervals defined by the other yarns of the filter cloth extending parallel thereto to form parallel channels therebetween to enable the filtered liquid to flow in the direction of the surface of the filtering element between the filtering portion of the filter cloth and the filtering element, wherein the thicker yarns are monofilaments, and that at least the yarns of the filter cloth that are parallel with the thicker yarns in the bottom and located at the thicker yarns are multifilaments, whereby the multifilament yarns have been moulded at the thicker yarns and thus form dense cloth also at the thicker yarns.

### Claim 2

A filtering module to be arranged on a filtering element as a filtering surface when liquid is separated from a mixture consisting of solids and liquid by means of a filtering apparatus, which filtering module is made of filter cloth comprising a filtering layer composed of yarns in the transverse and the longitudinal directions, and an underside of the filter cloth, i.e., the surface to be against the filtering element, is comprised of substantially parallel yarns that are thicker than the other yarns of the filter cloth, and that channels are formed between the thicker yarns by the placement of the thicker yarns at predetermined intervals defined by the other yarns of the filter cloth extending parallel thereto, wherein the liquid filtered by the cloth is allowed to flow in the direction of a surface of the filtering element, wherein the thicker yarns are monofilaments, and that at least the yarns of the filter cloth that are parallel with the thicker yarns in the bottom and located at the thicker yarns are multifilaments, whereby the multifilament yarns have been moulded at the thicker yarns and thus form dense cloth also at the thicker yarns.

### Claim 3

A filtering apparatus, comprising:
a filtering module; and
a filtering element, wherein the filtering module is arranged on a filtering element as a filtering surface where liquid is separated from a mixture consisting of solids and liquid where, the filtering module is made of a filter cloth comprising a filtering layer composed of yarns in the transverse and the longitudinal directions, and an underside of the filter cloth, i.e. the surface to be against the filtering element, comprises of substantially parallel yarns that are thicker than the other yarns of the filter cloth, and channels are formed between the thicker yarns by the placement of the thicker yarns at predetermined intervals defined by the other yarns of the filter cloth extending parallel thereto, wherein the liquid filtered by the filter cloth is allowed to flow in the direction of a surface of the filtering element, wherein the thicker yarns are monofilaments, and that at least the yarns of the filter cloth that are parallel with the thicker yarns in the bottom and located at the thicker yarns are multifilaments, whereby the multifilament yarns have been moulded at the thicker yarns and thus form dense cloth also at the thicker yarns.