US4290209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dryer fabric
Assignee: JWI Inc A DE CORP
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Filing: 1980-04-15
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Granted: 1981-09-22
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Expires: 2000-04-15
Abstract
Abstract An improved dryer fabric, woven entirely from monofilament plastic polymeric warp and weft strands, having a lower permeability to air flow and lower modulus of elasticity than normal fabrics, wherein at least the warp strands are flattened in cross-section, with the long axis of the flattened section extending parallel to the plane of the fabric and wherein the weft strands may be shaped so as to more or less conform to the horizontally directed passages of the mesh naturally formed by the woven warp strands and may also be relatively more malleable than the warp strands so that under stress they can adapt to conform to the shape of mesh interstices thereby to restrict these and still further reduce the permeability.
Inventors
- 👤 John G. Buchanan
- 👤 Donald G. MacBean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:20
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/0027; D21F1/0036
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
104 words
A dryer fabric for use in a papermaking machine comprising a plurality of interwoven warp and weft monofilament plastic polymeric strands woven with approximately 100% warp fill with edges of adjacent warp strands generally lying in common planes disposed generally normal to the plane of the fabric, at least said warp strands which extend in the machine direction, have a flattened cross-section with the long axis of said cross-section extending parallel to the plane of the fabric; the lowered profile of said flattened strands defining restricted diagonal apertures in the mesh of the fabric to thereby reduce the permeability of said fabric uniformly throughout.
Claim 2
Dependent Claim
104 words
A dryer fabric for use in a papermaking machine comprising a plurality of interwoven warp and weft monofilament plastic polymeric strands woven with approximately 100% warp fill with edges of adjacent warp strands generally lying in common planes disposed generally normal to the plane of the fabric, at least said warp strands which extend in the machine direction, have a flattened cross-section with the long axis of said cross-section extending parallel to the plane of the fabric; the lowered profile of said flattened strands defining restricted diagonal apertures in the mesh of the fabric to thereby reduce the permeability of said fabric uniformly throughout.
Claim 3
Dependent Claim
27 words
A dryer fabric as claimed in claim 1, wherein said flattened warp strands have a width and thickness ratio in the range of approximately 1.1:1 to 3:1.
Claim 4
Dependent Claim
42 words
A dryer fabric as claimed in claim 1, wherein the permeability of said fabric is in the range of approximately 50 to 250 cu.ft./min./sq.ft. as measured with a Frasier Air Permeometer and dependent upon the cross-sectional area of said flattened warp strands.
Claim 5
Dependent Claim
23 words
A dryer fabric as claimed in claim 1, wherein said flattened warp strands have a width to thickness ratio of 2 to 1.
Claim 6
Dependent Claim
21 words
A dryer fabric as claimed in claim 1, 2 or 14, wherein said flattened warp strands are generally rectangular in cross-section.
Claim 7
Dependent Claim
52 words
A dryer fabric as claimed in claim 1, or 2, or 4, wherein at least some of the weft strands are shaped to substantially conform to the horizontally directed interstitial weft directed passages of the mesh naturally formed by the woven warp strands to thereby reduce the space between adjacent weft strands.
Claim 8
Dependent Claim
89 words
A dryer fabric as claimed in claim 1 or 2 or 4, wherein there is provided two or more layers of weft strands, said interwoven warp strands defining interstices between them in the area between adjacent ones of said weft strands, said interstices in at least one horizontal plane of the fabric forming horizontally directed passages, at least some of said horizontally directed passages having monofilament plastic polymeric weft strands extending therethrough and shaped to conform substantially to said passages so as to further reduce permeability of said fabric.
Claim 9
Dependent Claim
22 words
A dryer fabric as claimed in claim 6, wherein at least some of said weft strands are of substantially diamond shaped cross-section.
Claim 10
Dependent Claim
18 words
A dryer fabric as claimed in claim 6, wherein at least some of said weft strands are hollow.
Claim 11
Dependent Claim
25 words
A dryer fabric as claimed in claim 6, wherein at least some of said weft strands are relatively malleable as compared to the warp strands.
Claim 12
Dependent Claim
54 words
A dryer fabric as claimed in claim 1 or 2 or 4, wherein there is provided a single layer of weft strands, at least some of the said strands being shaped to conform substantially to the horizontal passages formed by the said interwoven warp strands so as to further reduce permeability of said fabric.
Claim 13
Dependent Claim
146 words
A thin low modulus of elasticity dryer fabric woven with approximately 100% warp fill with edges of adjacent warp strands generally lying in common planes disposed generally normal to the plane of the fabric and having low permeability and for use in a single fabric dryer system in which the fabric passes in serpentine fashion between upper and lower tiers of drying cylinders and supporting a paper web along its serpentine path about said cylinders, said fabric comprising a plurality of interwoven warp and weft monofilament plastic polymeric strands, at least said warp strands which extend in the machine direction, have a flattened cross-section with the long axis of said cross-section extending parallel to the plane of the fabric, the lowered profile of said flattened strands defining restricted diagonal apertures in the mesh of the fabric to thereby reduce the permeability of the fabric uniformly throughout.
Claim 14
Dependent Claim
146 words
A thin low modulus of elasticity dryer fabric woven with approximately 100% warp fill with edges of adjacent warp strands generally lying in common planes disposed generally normal to the plane of the fabric and having low permeability and for use in a single fabric dryer system in which the fabric passes in serpentine fashion between upper and lower tiers of drying cylinders and supporting a paper web along its serpentine path about said cylinders, said fabric comprising a plurality of interwoven warp and weft monofilament plastic polymeric strands, at least said warp strands which extend in the machine direction, have a flattened cross-section with the long axis of said cross-section extending parallel to the plane of the fabric, the lowered profile of said flattened strands defining restricted diagonal apertures in the mesh of the fabric to thereby reduce the permeability of the fabric uniformly throughout.
Claim 15
Dependent Claim
42 words
A dryer fabric as claimed in claim 12, wherein the permeability of said fabric is in the range of approximately 50 to 250 cu.ft./min./sq.ft. as measured with a Frasier Air Permeometer and dependent upon the cross-sectional area of said flattened warp strands.
Claim 16
Dependent Claim
25 words
A dryer fabric as claimed in claim 12, wherein said modulus of elasticity is in the range of from 1500 to 3000 lbs. per inch.
Claim 17
Dependent Claim
31 words
A dryer fabric as claimed in claim 12, for use in a single fabric dryer system wherein all said drying cylinders are gear-coupled to one another through an integrated gear system.
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) | 1984-09-21 | 1985-03-23 | 1985-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-21 | 1989-03-23 | 1989-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-21 | 1993-03-23 | 1993-09-22 | $7700.00 | Window Closed / Lapsed |