US4642261A
Expired / Lapsed
US
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Papermakers fabric having a tight bottom weft geometry
Assignee: Unaform Inc
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Filing: 1984-12-21
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Granted: 1987-02-10
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Expires: 2004-12-21
Abstract
Abstract A two-face, double-layer forming fabric having a tight bottom weft geometry. The fabric, in general, comprises first and second pluralities of cross-machine direction yarns and a plurality of machine direction yarns interwoven in accordance with a desired weave pattern to define a top layer and a bottom layer. The top layer, which receives paper stock, is defined by the first plurality of cross-machine direction yarns. The bottom layer, which contacts machine rolls, is defined by the second plurality of cross-machine direction yarns. The second plurality of yarns are heat shrinkable. In one embodiment of the fabric, all machine direction yarns are woven in an 8-shaft weave to provide a 1/3 twill on the top layer and a 1/7 twill on the bottom layer. The cross-machine direction floats formed by this weave pattern are flattened during heat treatment of the fabric because of shrinkage of the bottom layer cross-machine direction yarns.
Inventors
- 👤 Ivan J. Fearnhead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:37
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/0027; D21F1/0036; Y; Y10; Y10S; Y10S162/00; Y10S162/903; Y10T; Y10T442/00; Y10T442/30; Y10T442/3179; Y10T442/3195; Y10T442/3211
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
82 words
A papermakers fabric comprising a duplex fabric having a plurality of machine direction yarns and cross-machine direction yarns interwoven in accordance with a desired weave pattern, a top layer defined by a first plurality of said cross-machine direction yarns and a bottom layer defined by a second plurality of said cross-machine direction yarns, said yarns of said second plurality having a higher heat shrinkage than said yarns of said first plurality and being contracted heat-shrinkable yarns after heat setting of the fabric.
Claim 2
Dependent Claim
82 words
A papermakers fabric comprising a duplex fabric having a plurality of machine direction yarns and cross-machine direction yarns interwoven in accordance with a desired weave pattern, a top layer defined by a first plurality of said cross-machine direction yarns and a bottom layer defined by a second plurality of said cross-machine direction yarns, said yarns of said second plurality having a higher heat shrinkage than said yarns of said first plurality and being contracted heat-shrinkable yarns after heat setting of the fabric.
Claim 3
Dependent Claim
18 words
The fabric of claim 1, wherein only the second plurality of cross-machine direction yarns are heat shrinkable yarns.
Claim 4
Dependent Claim
28 words
The fabric of claim 2, wherein said heat-shrinkable yarns are polyester monofilament yarns having a heat shrinkage at 200° C. within the range of about 8% to 20%.
Claim 5
Dependent Claim
35 words
The fabric of claim 3, wherein said first plurality of cross-machine direction yarns is made up of polyester monofilament yarns having a heat shrinkage at 200° C. within the range of about 3% to 6%.
Claim 6
Dependent Claim
47 words
The fabric of claim 4, further comprising a plurality of warp yarns interwoven with said first and second pluralities of cross-machine direction yarns, said warp yarns being made of polyester monofilament yarns having a heat shrinkage at 200° C. within the range of about 8% to 20%.
Claim 7
Dependent Claim
85 words
A papermaker's fabric comprising: a plurality of first weft yarns; a plurality of second weft yarns; and a plurality of warp yarns interwoven with said first and second weft yarns in accordance with a preselected weave pattern in which said first weft yarns define a top layer and said second weft yarns define a bottom layer, a select number of said second weft yarns having a higher heat shrinkage than said first weft yarns and being contracted heat-shrinkable yarns after heat setting of the fabric.
Claim 8
Dependent Claim
85 words
A papermaker's fabric comprising: a plurality of first weft yarns; a plurality of second weft yarns; and a plurality of warp yarns interwoven with said first and second weft yarns in accordance with a preselected weave pattern in which said first weft yarns define a top layer and said second weft yarns define a bottom layer, a select number of said second weft yarns having a higher heat shrinkage than said first weft yarns and being contracted heat-shrinkable yarns after heat setting of the fabric.
Claim 9
Dependent Claim
85 words
A multilayer forming fabric comprising: a plurality of substantially inextensible first cross-machine direction yarns lying substantially in a first plane to define a top layer; a plurality of contracted shrinkable second cross-machine direction yarns lying substantially in a second plane to define a bottom layer, said second yarns having a higher heat shrinkage than said first yarns; and a plurality of substantially inextensible machine direction yearns interwoven with said pluralities of inextensible and contracted, shrinkable cross-machine direction yarns in accordance with a predetermined weave pattern.
Claim 10
Dependent Claim
85 words
A multilayer forming fabric comprising: a plurality of substantially inextensible first cross-machine direction yarns lying substantially in a first plane to define a top layer; a plurality of contracted shrinkable second cross-machine direction yarns lying substantially in a second plane to define a bottom layer, said second yarns having a higher heat shrinkage than said first yarns; and a plurality of substantially inextensible machine direction yearns interwoven with said pluralities of inextensible and contracted, shrinkable cross-machine direction yarns in accordance with a predetermined weave pattern.
Claim 11
Dependent Claim
12 words
The fabric of claim 7, wherein said shrinkable yarns are heat-shrinkable yarns.
Claim 12
Dependent Claim
25 words
The fabric of claim 7, wherein said predetermined weave pattern produces a 1/3 twill on said top layer and 1/7 twill on said bottom layer.
Claim 13
Dependent Claim
14 words
The fabric of claim 1, wherein the fabric includes floats on said bottom layer.
Claim 14
Dependent Claim
14 words
The fabric of claim 6, wherein the fabric includes floats on said bottom layer.
Claim 15
Dependent Claim
14 words
The fabric of claim 7, wherein the fabric includes floats on said bottom layer.
Claim 16
Independent Claim
110 words
A method of making a forming fabric comprising the steps of: arranging a plurality of substantially inextensible cross-machine direction yarns in substantially the same first plane to define a forming fabric top layer; arranging a plurality of heat-shrinkable cross-machine direction yarns in substantially the same second plane to define a forming fabric bottom layer; interweaving a plurality of substantially inextensible machine direction yarns with said pluralities of inextensible and heat-shrinkable yarns in accordance with a predetermined weave pattern; and subjecting the interwoven yarns to a heat setting treatment to heat set said fabric for a time until said shrinkable yarns have shrunk to press up against the machine direction yarns.
Claim 17
Independent Claim
110 words
A method of making a forming fabric comprising the steps of: arranging a plurality of substantially inextensible cross-machine direction yarns in substantially the same first plane to define a forming fabric top layer; arranging a plurality of heat-shrinkable cross-machine direction yarns in substantially the same second plane to define a forming fabric bottom layer; interweaving a plurality of substantially inextensible machine direction yarns with said pluralities of inextensible and heat-shrinkable yarns in accordance with a predetermined weave pattern; and subjecting the interwoven yarns to a heat setting treatment to heat set said fabric for a time until said shrinkable yarns have shrunk to press up against the machine direction yarns.
Claim 18
Dependent Claim
14 words
The method of claim 13, wherein the fabric includes floats on said bottom layer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-09 | 1990-08-11 | 1991-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-09 | 1994-08-11 | 1995-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-09 | 1998-08-11 | 1999-02-10 | $7700.00 | Window Closed / Lapsed |