# US 9,751,190 B2 · Filters, screens, screen inserts, and methods of making same

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- Number: US 9,751,190 B2
- Document ID: US9751190B2
- Status: Granted
- Kind: B2
- Application number: 14/948,717
- Filed: 2015-11-23
- Published: 2016-03-17
- Granted: 2017-09-05
- Earliest claimed: 2010-09-17
- Assignees: Inflotek B.V.
- Applicants: Inflotek B.V.
- Inventors: Michael Jarchau; Paulus Antonius Jacobus Janitschek
- Web page: https://patentgrep.com/patent/US9751190B2

## CPC

- B24C 7/0015: {with control of feed parameters, e.g. feed rate of abrasive material or carrier}
- B01D 29/0093: {Making filtering elements not provided for elsewhere}
- B01D 29/012: {Making filtering elements (making bag, cage, hose, tube, sleeve or like filtering elements B01D29/111)}
- B01D 29/03: self-supporting
- B24C 1/045: {for cutting (energy dissipating devices therefor B26F3/008)}
- B24C: ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- 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)

## Abstract

A method of making a filter or screen can include directed a high pressure cutting jet against a hard material at a plurality of positions to be cut that are separated by a portion of the material that is to remain uncut. Prior to moving from a first position to a second position, the abrasive can be replaced with a liquid or gaseous interference medium in such a way that reduces an energy density of the cutting jet from an energy density sufficient to remove or cut the material to an energy density insufficient to remove or cut the material. Once moved from the first position to the second position, the interference medium can be replaced with the abrasive in such a way that increases the energy density of the cutting jet from an energy density insufficient to remove the material to an energy density sufficient to remove the material.

## Claims

### Claim 1

A method of making a filter or screen, comprising:
providing a high pressure cutting jet comprising a continuous high pressure fluid and an abrasive and directing the cutting jet against a hard material at a plurality of positions to be cut, wherein the plurality of positions to be cut includes at least a first position and a second position separated by a portion of the material that is to remain uncut;
prior to moving from the first position to the second position, replacing the abrasive with a liquid or gaseous interference medium in such a way that reduces an energy density of the cutting jet from an energy density sufficient to remove or cut the material to an energy density insufficient to remove or cut the material;
the cutting jet moving from the first position to the second position;
upon reaching the second position, replacing the liquid or gaseous interference medium with the abrasive in such a way that increases the energy density of the cutting jet from an energy density insufficient to remove the material to an energy density sufficient to remove the material;
wherein supply of the abrasive and of the liquid or gaseous interference medium are synchronized and dependent on each other, such that supplying the liquid or gaseous interference medium to the cutting jet causes the abrasive to be interrupted and interrupting the liquid or gaseous interference medium causes the abrasive to be supplied to the cutting jet; and
wherein cuts made at the plurality of positions to be cut are tapering through openings, and wherein edges along the through openings are characterized by sharp edges.

### Claim 2 (depends on 1)

The method of claim 1, wherein the filter or screen comprises a screen insert.

### Claim 3 (depends on 1)

The method of claim 1, wherein the cutting jet moving from the first position to the second position further comprises moving the cutting jet, moving the material, and/or moving the cutting jet and the material relative to each other.

### Claim 4 (depends on 1)

The method of claim 1, wherein the abrasive comprises a pourable substance or a suspension.

### Claim 5 (depends on 1)

The method of claim 1, wherein the abrasive comprises sand or mineral particles selected to minimize particle size distribution.

### Claim 6 (depends on 1)

The method of claim 1, wherein the cutting jet operates at about 3000 bar to about 4000 bar.

### Claim 7 (depends on 1)

The method of claim 1, wherein the supply of the abrasive and of the liquid or gaseous interference medium is computer-controlled.

### Claim 8

A method of making a filter or screen, comprising:
producing a first opening in a hard material by directing a high pressure cutting jet against the material at one or more first positions where the first opening is to be formed, the high pressure cutting jet comprising a continuous high pressure fluid and an abrasive;
after producing the first opening, replacing the abrasive with a liquid or gaseous interference medium in such a way that reduces an energy density of the cutting jet from an energy density sufficient to remove or cut the material to an energy density insufficient to remove or cut the material;
while the cutting jet possesses the energy density insufficient to remove or cut the material, the cutting jet moving to a second position on the material where at least a portion of a second opening is to be formed;
replacing the liquid or gaseous interference medium with the abrasive in such a way that increases the energy density of the cutting jet from an energy density insufficient to remove the material to an energy density sufficient to remove the material, thereby producing at least a portion of a second opening in the material;
wherein supply of the abrasive and of the liquid or gaseous interference medium are synchronized and dependent on each other, such that supplying the liquid or gaseous interference medium to the cutting jet causes the abrasive to be interrupted and interrupting the liquid or gaseous interference medium causes the abrasive to be supplied to the cutting jet; and
wherein cuts made at least at the one or more first positions are tapering through openings, and wherein edges along the through openings are characterized by sharp edges.

### Claim 9 (depends on 8)

The method of claim 8, wherein the filter or screen comprises a screen insert.

### Claim 10 (depends on 8)

The method of claim 8, wherein the cutting jet moving to a second position further comprises moving the cutting jet, moving the material, and/or moving the cutting jet and the material relative to each other.

### Claim 11 (depends on 8)

The method of claim 8, wherein the abrasive comprises a pourable substance or a suspension.

### Claim 12 (depends on 8)

The method of claim 8, wherein the abrasive comprises sand or mineral particles selected to minimize particle size distribution.

### Claim 13 (depends on 8)

The method of claim 8, wherein the cutting jet operates at about 3000 bar to about 4000 bar.

### Claim 14 (depends on 8)

The method of claim 8, wherein the supply of the abrasive and of the liquid or gaseous interference medium is computer-controlled.