US4438788A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Papermakers belt formed from warp yarns of non-circular cross section
Assignee: Scapa Inc
•
Filing: 1981-04-28
•
Granted: 1984-03-27
•
Expires: 2001-04-28
Abstract
Abstract A papermakers fabric having surface floats on both the paper surface and the non-paper contacting surface for improved sheet contact area and improved abrasion resistance. The fabric also includes a plurality of stuffer pick receiving sheds defined by warp yarns of non-circular cross section used to weave the fabric. In a preferred embodiment, the warp yarns are of generally rectangular cross section with rounded corners. Each of these sheds may receive a stuffer pick, the construction of which will be determined by the permeability required in the finished fabric, while the warp and weft yarns used to define the fabric remain unchanged. The warp ends of the fabric terminate in a pin seam made up of a number of enlarged seam loops which are created when a select number of the warp yarns of non-circular cross section are symmetrically rewoven into the fabric.
Inventors
- 👤 William J. Harwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:03
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/0027; D21F1/0054; D21F1/0036; Y; Y10; Y10S; Y10S162/00; Y10S162/903
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
159 words
A papermakers fabric comprising: a first layer defined by a first plurality of weft yarns; a second layer defined by a second plurality of weft yarns; a plurality of stuffer picks; and a plurality of warp yarns of non-circular cross section interwoven with said weft yarns to define a first surface on said first layer, a second surface on said second layer, and a plurality of stuffer pick receiving sheds interposed between said first and second layers, each shed for receiving at least one of said stuffer picks, a select number of said shed defining warp yarns extending out of a warp end of said fabric and being symmetrically rewoven into said fabric to produce a mirror image of itself when viewed with respect to the plane defined by said stuffer picks and to define a number of seam loops, one seam loop being formed by at least one of a preselected number of adjacent shed defining warp yarns.
Claim 2
Dependent Claim
159 words
A papermakers fabric comprising: a first layer defined by a first plurality of weft yarns; a second layer defined by a second plurality of weft yarns; a plurality of stuffer picks; and a plurality of warp yarns of non-circular cross section interwoven with said weft yarns to define a first surface on said first layer, a second surface on said second layer, and a plurality of stuffer pick receiving sheds interposed between said first and second layers, each shed for receiving at least one of said stuffer picks, a select number of said shed defining warp yarns extending out of a warp end of said fabric and being symmetrically rewoven into said fabric to produce a mirror image of itself when viewed with respect to the plane defined by said stuffer picks and to define a number of seam loops, one seam loop being formed by at least one of a preselected number of adjacent shed defining warp yarns.
Claim 3
Dependent Claim
31 words
The papermakers fabric of claim 1, wherein each of said stuffer pick receiving sheds has four sides, each side being defined by one of said warp yarns of non-circular cross section.
Claim 4
Dependent Claim
25 words
The papermakers fabric of claim 1, wherein the size of each of said seam loops is determined by one crimp length of said warp yarn.
Claim 5
Dependent Claim
13 words
The papermakers fabric of claim 1, wherein said weft yarns are monofilament yarns.
Claim 6
Dependent Claim
19 words
The papermakers fabric of claim 1, wherein said warp yarns are monofilament yarns having a generally rectangular cross section.
Claim 7
Dependent Claim
26 words
The papermakers fabric of claim 1, wherein said stuffer picks are selected from the group consisting of monofilament yarns, multifilament yarns, staple yarns, and spun yarns.
Claim 8
Dependent Claim
23 words
The papermakers fabric of claim 1 wherein each of said seam loops is positioned symmetrically relative to said first and said second surfaces.
Claim 9
Dependent Claim
18 words
The papermakers fabric of claim 7 wherein each of said warp yarns is symmetrically rewoven into said fabric.
Claim 10
Dependent Claim
178 words
A papermakers fabric comprising: a first layer defined by a first plurality of cross-machine direction weft yarns of circular cross section; a second layer defined by a second plurality of cross-machine direction weft yarns of circular cross section; and a plurality of machine direction warp yarns of generally rectangular cross section, each of said warp yarns interwoven with each of said layers of weft yarns to define a first surface of flat warp direction floats on said first layer and a second surface of flat warp direction floats on said second layer, said floats in each of said first and second surfaces spanning at least two weft yarns, wherein all said warp yarns extend out of a warp end of said fabric and are symmetrically rewoven into said fabric to produce a mirror image of itself when viewed with respect to an intermediate plane of said fabric and to define a number of binder loops and a number of seam loops, one seam loop being formed by at least one of a preselected number of adjacent warp yarns.
Claim 11
Dependent Claim
178 words
A papermakers fabric comprising: a first layer defined by a first plurality of cross-machine direction weft yarns of circular cross section; a second layer defined by a second plurality of cross-machine direction weft yarns of circular cross section; and a plurality of machine direction warp yarns of generally rectangular cross section, each of said warp yarns interwoven with each of said layers of weft yarns to define a first surface of flat warp direction floats on said first layer and a second surface of flat warp direction floats on said second layer, said floats in each of said first and second surfaces spanning at least two weft yarns, wherein all said warp yarns extend out of a warp end of said fabric and are symmetrically rewoven into said fabric to produce a mirror image of itself when viewed with respect to an intermediate plane of said fabric and to define a number of binder loops and a number of seam loops, one seam loop being formed by at least one of a preselected number of adjacent warp yarns.
Claim 12
Dependent Claim
19 words
The papermakers fabric of claim 9, wherein all of the floats of said first surface are of equal length.
Claim 13
Dependent Claim
21 words
The papermakers fabric according to claim 10, wherein all of the floats of said second surface are of the same length.
Claim 14
Dependent Claim
23 words
The papermakers fabric according to claim 11, wherein all of the floats of said first and second surfaces are of the same length.
Claim 15
Dependent Claim
142 words
A papermakers fabric comprising: a first layer defined by a first plurality of weft yarns; a second layer defined by a second plurality of weft yarns; and a plurality of warp yarns of non-circular cross section interwoven with said weft yarns to define a first surface on said first layer, a second surface on said second layer, and a plurality of stuffer pick receiving sheds interposed between said first and second layers, said warp yarns extending out of a warp end of said fabric, and being symmetrically rewoven into said fabric to produce a mirror image of itself when viewed with respect to the plane defined by said stuffer picks and to define a number of seam loops, one seam loop being formed by at least one warp yarn in every six adjacent warp yarns, the remaining warp yarns defining binder loops.
Claim 16
Dependent Claim
142 words
A papermakers fabric comprising: a first layer defined by a first plurality of weft yarns; a second layer defined by a second plurality of weft yarns; and a plurality of warp yarns of non-circular cross section interwoven with said weft yarns to define a first surface on said first layer, a second surface on said second layer, and a plurality of stuffer pick receiving sheds interposed between said first and second layers, said warp yarns extending out of a warp end of said fabric, and being symmetrically rewoven into said fabric to produce a mirror image of itself when viewed with respect to the plane defined by said stuffer picks and to define a number of seam loops, one seam loop being formed by at least one warp yarn in every six adjacent warp yarns, the remaining warp yarns defining binder loops.
References Cited (Backward Citations)
GB1220531A
Cited
DE2120967A1
Cited
US4071050A
Cited
US3957090A
Cited
US4026331A
Cited
US4182381A
Cited
US4086941A
Cited
US4142557A
Cited
US4244084A
Cited
US4290209A
Cited
US4274448A
Cited
US4224372A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-27 | 1987-09-26 | 1988-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-27 | 1991-09-26 | 1992-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-27 | 1995-09-26 | 1996-03-27 | $7700.00 | Window Closed / Lapsed |