US4815499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite forming fabric
Assignee: Jwi Ltd
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Filing: 1988-02-25
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Granted: 1989-03-28
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Expires: 2008-02-25
Abstract
Abstract A composite paper making fabric comprising at least two complete weaves each formed by its own set of warp and weft yarns and interconnected by a binder yarn which is interwoven with the two complete weaves. An upper one of the complete weaves constitutes a paper-side weave which is comprised of flattened warp yarns interwoven with its weft yarns.
Inventors
- 👤 Dale B. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:19
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/0027; D21F1/0036; D21F1/0045; Y; Y10; Y10S; Y10S162/00; Y10S162/903
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
183 words
A composite paper-making forming fabric of reduced thickness and having improved fiber retention, comprising at least two complete weaves, each formed by its own set of warp and weft yarns and being interconnected by binder yarns which are separately interwoven with said two complete weaves, an upper one of said complete weaves constituting a paper-side weave which is comprised of flattened warp yarns having an aspect ratio of width to height of between 1.20 and 2.30 and interwoven with said weft yarns and having a plain weave, and a bottom one of said complete weaves constituting the machine-side weave which is comprised of flattened warp yarns having an aspect ratio of width to height of between 1.20 and 2.30; wherein said bottom weave has a mesh count of substantially half that of said upper weave; and wherein said upper weave has a machine-direction frame length which is less than that when round yarns are used; and further wherein the product of the warp mesh count and the width of the flattened warp strands in the upper weave is not more than about 0.65.
Claim 2
Dependent Claim
183 words
A composite paper-making forming fabric of reduced thickness and having improved fiber retention, comprising at least two complete weaves, each formed by its own set of warp and weft yarns and being interconnected by binder yarns which are separately interwoven with said two complete weaves, an upper one of said complete weaves constituting a paper-side weave which is comprised of flattened warp yarns having an aspect ratio of width to height of between 1.20 and 2.30 and interwoven with said weft yarns and having a plain weave, and a bottom one of said complete weaves constituting the machine-side weave which is comprised of flattened warp yarns having an aspect ratio of width to height of between 1.20 and 2.30; wherein said bottom weave has a mesh count of substantially half that of said upper weave; and wherein said upper weave has a machine-direction frame length which is less than that when round yarns are used; and further wherein the product of the warp mesh count and the width of the flattened warp strands in the upper weave is not more than about 0.65.
Claim 3
Dependent Claim
20 words
The composite forming fabric as claimed in claim 1, in which said binder yarns are woven in the weft direction.
Claim 4
Dependent Claim
20 words
The composite forming fabric as claimed in claim 1, in which said binder yarns are woven in the warp direction.
Claim 5
Dependent Claim
30 words
The composite fabric as claimed in claim 1, in which said flattened warps of the upper weave have an aspect ratio of width to height of between 1.30 and 2.00.
Claim 6
Dependent Claim
28 words
The composite fabric as claimed in claim 1, in which said flattened warps of the upper weave have an aspect ratio of width to height of between 1.67-1.75.
Claim 7
Dependent Claim
25 words
The composite fabric as claimed in claim 1, in which said flattened bottom warps have an aspect ratio of width to height of between 1.60-2.20.
Claim 8
Dependent Claim
25 words
The composite fabric as claimed in claim 1, in which said flattened bottom warps have an aspect ratio of width to height of between 2.00-2.05.
Claim 9
Dependent Claim
22 words
The composite fabric as claimed in claim 1, wherein said upper weave has a warp mesh count of 36-100 strands per inch.
Claim 10
Dependent Claim
23 words
The composite fabric as claimed in claim 8, wherein said upper weave has a warp mesh count of about 40-80 strands per inch.
Claim 11
Dependent Claim
41 words
The composite fabric as claimed in claim 1, wherein the product of the warp mesh count and the width of the flattened warp strands in the upper weave of said forming fabric is in the range of about 0.47 to 0.65.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-27 | 1992-09-26 | 1993-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-27 | 1996-09-26 | 1997-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-27 | 2000-09-26 | 2001-03-28 | $7700.00 | Window Closed / Lapsed |