# US 2014/0190645 A1 · Pin seamed press felt with triple layer base fabric

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- Number: US 2014/0190645 A1
- Document ID: US20140190645A1
- Status: Published application
- Kind: A1
- Application number: 14/075,673
- Filed: 2013-11-08
- Published: 2014-07-10
- Earliest claimed: 2013-01-10
- Assignees: Huyck Licensco, Inc.
- Applicants: Huyck Licensco, Inc.
- Inventors: Hans-Peter Breuer; Friedrich Postl
- Web page: https://patentgrep.com/patent/US20140190645A1

## CPC

- D21F 7/10: Seams thereof
- D21F: PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON

## Abstract

A press felt includes: a base fabric comprising a plurality of repeat units, each of the repeat units comprising a plurality of exterior machine direction (MD) yarns, each of which includes an upper run and a lower run merging with seam loops at each end, a plurality of middle MD yarns positioned between the upper and lower runs of the exterior MD yarns, a plurality of cross machine direction (CMD) yarns interwoven with the exterior MD yarns and the middle MD yarns in a predetermined regular weave pattern, the seam loops defining the longitudinal ends of the press felt; and a batt layer overlying the base fabric.

## Claims

### Claim 1

A press felt, comprising:
(a) a base fabric comprising a plurality of repeat units, each of the repeat units comprising a plurality of exterior machine direction (MD) yarns; each of which includes an upper run and a lower run merging with seam loops at each end, a plurality of middle MD yarns positioned between the upper and lower runs of the exterior MD yarns, and a plurality of cross machine direction (CMD) yarns interwoven with the exterior MD yarns and the middle MD yarns in a predetermined regular weave pattern, the seam loops defining the longitudinal ends of the press felt; and
(b) a batt layer overlying the base fabric.

### Claim 2 (depends on 1)

The press felt defined in claim 1, wherein the plurality of middle MD yarns comprises half the number of the plurality of exterior MD yarns.

### Claim 3 (depends on 2)

The press felt defined in claim 2, wherein each of the middle MD yarns has two generally parallel runs connected by a loop.

### Claim 4 (depends on 1)

The press felt defined in claim 1, wherein the repeat unit includes four exterior MD yarns and two middle MD yarns.

### Claim 5 (depends on 4)

The press felt defined in claim 4, wherein the repeat unit includes four CMD yarns.

### Claim 6 (depends on 4)

The press felt defined in claim 4, wherein the repeat unit includes eight CMD yarns.

### Claim 7 (depends on 3)

The press felt defined in claim 3, wherein at least one of the CMD yarns in the repeat unit interweaves between the runs of a respective middle MD yarn.

### Claim 8 (depends on 1)

The press felt defined in claim 1, wherein the seam loops at one end are interdigitated with the seam loops at the other end, and further comprising a pin inserted into the interdigitated loops.

### Claim 9

A press felt, comprising:
(a) a base fabric comprising a plurality of repeat units, each of the repeat units comprising a plurality of exterior machine direction (MD) yarns, each of which includes an upper run and a lower run merging with seam loops at each end, a plurality of middle MD yarns positioned between the upper and lower runs of the exterior MD yarns, and a plurality of cross machine direction (CMD) yarns interwoven with the exterior MD yarns and the middle MD yarns in a predetermined regular weave pattern, the seam loops defining the longitudinal ends of the press felt, wherein each of the middle MD yarns has two generally parallel runs connected by a loop; and
(b) a batt layer overlying the base fabric.

### Claim 10 (depends on 9)

The press felt defined in claim 9, wherein the repeat unit includes four exterior MD yarns and two middle MD yarns.

### Claim 11 (depends on 10)

The press felt defined in claim 10, wherein the repeat unit includes four CMD yarns.

### Claim 12 (depends on 10)

The press felt defined in claim 10, wherein the repeat unit includes eight CMD yarns.

### Claim 13 (depends on 9)

The press felt defined in claim 9, wherein the seam loops at one end are interdigitated with the seam loops at the other end, and further comprising a pin inserted into the interdigitated loops.

### Claim 14 (depends on 13)

The press felt defined in claim 13, wherein the pintle is not inserted into the loops formed by the middle MD yarns.

### Claim 15 (depends on 9)

The press felt defined in claim 9, wherein at least one of the CMD yarns in the repeat unit interweaves between the runs of a respective middle MD yarn.