# US 8,784,615 B2 · Perforated film clothing having a tear-resistant edge

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- Number: US 8,784,615 B2
- Document ID: US8784615B2
- Status: Granted
- Kind: B2
- Application number: 13/939,618
- Filed: 2013-07-11
- Published: 2013-11-14
- Granted: 2014-07-22
- Earliest claimed: 2011-01-11
- Assignees: Voith Patent GmbH
- Applicants: Voith Patent GmbH
- Inventors: Michael Straub; Robert Eberhardt
- Web page: https://patentgrep.com/patent/US8784615B2

## CPC

- D21F 1/0081: {with single endless strands travelling in generally parallel convolutions}
- D21F 1/0063: {Perforated sheets}
- Y10T 428/24273: including aperture
- D21F: PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A clothing for a paper machine is configured as a film-shaped continuous band that is closed in the circumferential direction and that has a perforated useful area and at least one edge extending between the useful area and a lateral edge. The edge area has a perforation density lower than the perforation density of the useful area.

## Claims

### Claim 1

A clothing for a paper machine, the clothing comprising:
a film-like continuous belt closed in a direction of rotation, said continuous belt having a perforated usable region and at least one edge region extending between said perforated usable region and a lateral edge of said continuous belt, said at least one edge region having a lower perforation density compared to said perforated usable region, wherein said at least one edge region has a plurality of pores arranged in a plurality of rows of apertures extending at constant distances in said direction of rotation, said constant distance of said aperture rows to each other and to said perforated usable region of the clothing is greater than a distance between said aperture rows of said perforated usable region of the clothing extending in said direction of rotation of the clothing.

### Claim 2 (depends on 1)

The clothing according to claim 1, wherein a distance between said at least one lateral edge of the clothing and a first row of apertures directly adjacent said at least one lateral edge is consistent with at least a distance from said first row of apertures and a second row of apertures located most closely adjacent to said first row of apertures.

### Claim 3 (depends on 1)

The clothing according to claim 1, wherein a distance between a first row of apertures located in said at least one edge region and second row of apertures located most closely adjacent said first row of apertures in a direction of said at least one lateral edge is greater than a distance to a third row of apertures most closely adjacent to said second row in a direction of said perforated usable region.

### Claim 4 (depends on 3)

The clothing according to claim 3, wherein at least one row of apertures disposed in said at least one edge region has a lower density of apertures than another row of apertures located most closely adjacent said at least one row of apertures in said edge region in said direction of said perforated usable region of the clothing.

### Claim 5 (depends on 3)

The clothing according to claim 3, wherein a distance between said at least one lateral edge of the clothing and said first row of apertures located most closely to said at least one lateral edge in said at least one edge region is greater than a distance between said first row of apertures to a second row of apertures located most closely adjacent to said first row of apertures.

### Claim 6 (depends on 1)

The clothing according to claim 1, wherein a plurality of apertures in said plurality of rows of apertures located in said at least one edge region have a different cross sectional geometry than a plurality of pores in said perforated usable region.

### Claim 7 (depends on 6)

The clothing according to claim 6, wherein an orientation of said cross sectional geometries of a plurality of apertures in at least one row of said plurality of rows of apertures located in said at least one edge region is different from an orientation of said cross sectional geometry of a plurality of apertures in a plurality of other of said plurality of rows of apertures.

### Claim 8 (depends on 6)

The clothing according to claim 6, wherein said cross sectional geometries of a plurality of apertures within one of said plurality of rows of apertures located in said at least one edge region are oriented differently.