# US 10,765,978 B2 · Filter

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- Number: US 10,765,978 B2
- Document ID: US10765978B2
- Status: Granted
- Kind: B2
- Application number: 15/573,484
- Filed: 2015-05-15
- Published: 2018-03-29
- Granted: 2020-09-08
- Earliest claimed: 2015-05-15
- Assignees: Jnc Corporation; Jnc Filter Co., Ltd.
- Applicants: Jnc Corporation; Jnc Filter Co., Ltd.
- Inventors: Daisuke Endo; Yozo Higuchi; Shinichi Tokudome; Kazuki Kanari
- Web page: https://patentgrep.com/patent/US10765978B2

## CPC

- B01D 39/16: of organic material, e.g. synthetic fibres
- B01D 29/11: with bag, cage, hose, tube, sleeve or like filtering elements
- B32B 5/022: {Non-woven fabric}
- B32B 5/028: {Net structure, e.g. spaced apart filaments bonded at the crossing points}
- B32B 5/08: the fibres or filaments of a layer being of different substances {, e.g. conjugate fibres, mixture of different fibres}
- B32B 5/26: another layer {next to it} also being fibrous or filamentary {(relative arrangement of fibres or filaments of different layers B32B5/12)}
- B32B 7/04: Interconnection of layers
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- D04H 1/4374: using different kinds of webs, e.g. by layering webs
- D04H 1/56: in association with fibre formation, e.g. immediately following extrusion of staple fibres
- D04H 1/593: to layered webs
- B01D 2239/1216: Pore size
- B01D 2239/1233: Fibre diameter
- B32B 2262/00: Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B 2262/0253: Polyolefin fibres
- B32B 2262/0261: Polyamide fibres
- B32B 2262/0284: Polyethylene terephthalate [PET] or polybutylene terephthalate [PBT]
- B32B 2262/101: Glass fibres
- B32B 2307/206: Insulating
- B32B 2307/554: Wear resistance
- B32B 2307/728: Hydrophilic
- B32B 2307/73: Hydrophobic
- 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)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- D04H: MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL (weaving D03; knitting D04B; braiding D04C; net-making D04G; sewing D05B; tufting D05C; finishing non-woven fabrics D06); FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING {; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION}(non-woven fabrics having an intermediate or external layer of a different kind, e.g. of woven fabric, B32B)

## Abstract

Shown is a filter in which powder aggregation (bridge) is hard to occur, and a time until a rise of differential pressure is caused is long, more specifically, a filtration life is long. The filter has a base material layer, a filtration layer and a skin layer, in which the base material layer is a layer formed by a nonwoven fabric being wound in a multiple manner, and subjected to the thermocompression bonding, the filtration layer is a layer formed by a laminate prepared by laminating at least a through-air nonwoven fabric and a net, being wound in a multiple manner, and subjected to no thermocompression bonding, the skin layer is a layer including a nonwoven fabric, and a mean pore diameter of the nonwoven fabric composing the base material layer and the skin layer is larger than a mean pore diameter of the through-air nonwoven fabric composing the filtration layer.

## Claims

### Claim 1

A filter, comprising a base material layer, a filtration layer and a skin layer,
wherein the base material layer is a layer formed by a nonwoven fabric being wound in a multiple manner, and subjected to thermocompression bonding;
the filtration layer is a laminate comprising at least a through-air nonwoven fabric and a net wound in a multiple manner and not thermocompression bonded together, and there is a gap between the through-air nonwoven fabric(s) in the filtration layer;
the skin layer is a layer including a nonwoven fabric; and
a mean pore diameter of the nonwoven fabric composing the base material layer and the skin layer is larger than a mean pore diameter of the through-air nonwoven fabric composing the filtration layer.

### Claim 2 (depends on 1)

The filter according to claim 1, wherein, in the laminate composing the filtration layer, a melt-blown nonwoven fabric, in addition to the through-air nonwoven fabric and the net, is laminated.

### Claim 3 (depends on 1)

The filter according to claim 1, wherein the nonwoven fabric composing the base material layer is a melt-blown nonwoven fabric or a through-air nonwoven fabric each having air permeability in the range from 200 to 300 cc/cm2/sec upon stacking 10 sheets.

### Claim 4 (depends on 1)

The filter according to claim 1, wherein the through-air nonwoven fabric composing the filtration layer is a through-air nonwoven fabric having a mean fiber diameter in the range from 0.1 to 200 μm.

### Claim 5 (depends on 1)

The filter according to claim 1, wherein the net has a mesh size thereof in the range from 1 to 5 mm, and a mean fiber diameter in the range from 50 to 300 μm.

### Claim 6 (depends on 1)

The filter according to claim 1, wherein, in the through-air nonwoven fabric composing the filtration layer, fibers are fused and/or bonded with each other at intersection points of the fibers in the through-air nonwoven fabric.

### Claim 7 (depends on 1)

A cylindrical filter, comprising the filter according to claim 1.

### Claim 8 (depends on 1)

The filter according to claim 1, wherein, the filtration layer is wound in the multiple manner in which the through-air nonwoven fabric and the net are wound in a layer-by-layer manner.

### Claim 9 (depends on 1)

The filter according to claim 1, wherein, the through-air nonwoven fabrics and the net in the filtration layer are alternated disposed in a multiple manner.