US4327779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dryer felt having a soft, bulky surface
Assignee: Scapa Inc
•
Filing: 1979-08-07
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Granted: 1982-05-04
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Expires: 1999-08-07
Abstract
Abstract A dryer felt having a soft, bulky top surface and comprising at least a top surface, which is defined by a plurality of machine direction yarns and a plurality of cross machine direction yarns interwoven according to a desired weave pattern. A preselected number of the yarns of the top surface are encapsulated yarns, the number being chosen to ensure that a major portion of the top surface is soft and bulky. Each of the encapsulated yarns comprises a straight, twistless monofilament core and a close-fitting encapsulating sheath surrounding the full length of the core.
Inventors
- 👤 William T. Westhead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:06
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/22; D02G3/36; D02G3/40; D02G3/44; D02G3/447; D03; D03D; D03D15/00; D03D15/20; D03D15/242; D03D15/247; D03D15/283; D21; D21F; D21F1/00; D21F1/0027; D21F1/0036; D10; D10B; D10B2101/00; D10B2101/02; D10B2101/04; D10B2101/06; D10B2201/00; D10B2201/01; D10B2201/02; D10B2211/00; D10B2211/01; D10B2211/02; Y; Y10; Y10S; Y10S162/00; Y10S162/902
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
122 words
A dryer felt comprising: a top surface; a plurality of machine direction yarns and a plurality of cross machine direction yarns interwoven according to a desired weave pattern to produce said top surface; and a preselected number of said yarns of said top surface being encapsulated yarns, said number being chosen to ensure that a major portion of said top surface is soft and bulky, each of said encapsulated yarns comprising a straight, twistless monofilament core that has no turns about its axis per unit of length, and a sheath completely surrounding and covering the full length of said core, said monofilament core comprising a bundle of filaments treated with a heat resistant resin to make the bundle act like a monofilament.
Claim 2
Dependent Claim
122 words
A dryer felt comprising: a top surface; a plurality of machine direction yarns and a plurality of cross machine direction yarns interwoven according to a desired weave pattern to produce said top surface; and a preselected number of said yarns of said top surface being encapsulated yarns, said number being chosen to ensure that a major portion of said top surface is soft and bulky, each of said encapsulated yarns comprising a straight, twistless monofilament core that has no turns about its axis per unit of length, and a sheath completely surrounding and covering the full length of said core, said monofilament core comprising a bundle of filaments treated with a heat resistant resin to make the bundle act like a monofilament.
Claim 3
Dependent Claim
19 words
The dryer felt according to claim 1, wherein the preselected yarns of said top surface are machine direction yarns.
Claim 4
Dependent Claim
20 words
The dryer felt according to claim 1, wherein the preselected yarns of said top surface are cross machine direction yarns.
Claim 5
Dependent Claim
27 words
The dryer felt according to claim 1, further comprising a base plane, and a second plurality of cross machine direction yarns arranged to define said base plane.
Claim 6
Dependent Claim
36 words
The dryer felt according to claim 4, further comprising an intermediate plane positioned between said top surface of said base plane, and a third plurality of cross machine direction yarns arranged to define said intermediate plane.
Claim 7
Dependent Claim
18 words
The dryer felt ccording to claim 1, wherein said sheath is made from a soft and bulky material.
Claim 8
Dependent Claim
29 words
The dryer felt according to claim 6, wherein said sheath is made from a material chosen from the group consisting of asbestos, cotton, wool, synthetic fibers or aramid fibers.
Claim 9
Dependent Claim
28 words
The dryer felt according to claim 6, wherein said sheath is made from a material chosen from the group consisting of mineral fibers, natural fibers or man-made fibers.
Claim 10
Dependent Claim
15 words
The dryer felt according to claim 1, wherein said monofilament core comprises a monofilament fiber.
Claim 11
Dependent Claim
13 words
The dryer felt according to claim 9, wherein said fiber is a wire.
Claim 12
Dependent Claim
17 words
The dryer felt according to claim 9, wherein said fiber is made from a treated glass fiber.
Claim 13
Dependent Claim
14 words
The dryer felt according to claim 1 wherein said resin is a phenolic resin.
Claim 14
Dependent Claim
23 words
The dryer felt according to claim 1, wherein said monofilament core has a diameter in the range of about 5 to 50 mils.
Claim 15
Dependent Claim
29 words
The dryer felt according to claim 1, wherein the monofilament core is made from a synthetic material chosen from the group consisting of polyesters, polyamides, aramid, polyolefins and acrylics.
Claim 16
Dependent Claim
23 words
The dryer felt according to claim 1, wherein the monofilament core has a diameter in the range of about 15 to 25 mils.
Claim 17
Dependent Claim
26 words
The dryer felt according to claim 15, wherein the monofilament core is made from a material chosen from the group consisting of polyesters, polyamides and aramids.
Claim 18
Dependent Claim
26 words
The dryer felt according to claim 1, wherein said filaments are twistless so that each filament has no turns about its axis per unit of length.
Claim 19
Independent Claim
131 words
A method of making a dryer felt having a soft, bulky surface, the method comprising the steps of weaving a fabric having a top surface, defining said top surface by a plurality of machine direction yarns and a plurality of cross machine direction yarns, creating a soft, bulky surface on a major portion of said top surface by having encapsulated yarns constitute a preselected number of said yarns of said top surface, and selecting encapsulated yarns, each of which comprises a straight, twistless monofilament core that has no turns about its axis per unit of length and a sheath completely surrounding and covering the full length of said core, said monofilament core comprising a bundle of filaments treated with a heat resistant resin to make the bundle act like a monofilament.
Claim 20
Independent Claim
131 words
A method of making a dryer felt having a soft, bulky surface, the method comprising the steps of weaving a fabric having a top surface, defining said top surface by a plurality of machine direction yarns and a plurality of cross machine direction yarns, creating a soft, bulky surface on a major portion of said top surface by having encapsulated yarns constitute a preselected number of said yarns of said top surface, and selecting encapsulated yarns, each of which comprises a straight, twistless monofilament core that has no turns about its axis per unit of length and a sheath completely surrounding and covering the full length of said core, said monofilament core comprising a bundle of filaments treated with a heat resistant resin to make the bundle act like a monofilament.
Claim 21
Dependent Claim
17 words
The method of claim 18, wherein the preselected yarns of said top surface are machine direction yarns.
Claim 22
Dependent Claim
18 words
The method of claim 18, wherein the preselected yarns of said top surface are cross machine direction yarns.
Claim 23
Dependent Claim
41 words
The method according to claim 18, wherein the step of selecting encapsulated yarns further comprises selecting an encapsulated yarn comprising a monofilament core made from a synthetic material, and a sheath, made from a soft, bulky material, surrounding said monofilament core.
Claim 24
Dependent Claim
30 words
The method according to claim 21, further comprising the step of selecting said synthetic material for said monofilament core from the group consisting of polyesters, polyamides, aramids, polyolefins and acrylics.
Claim 25
Dependent Claim
32 words
The method according to claim 21, further comprising the step of selecting said soft, bulky material for said sheath from the group consisting of asbestos, cotton, wool, synthetic fibers, and aramid fibers.
Claim 26
Dependent Claim
31 words
The method according to claim 21, further comprising the step of selecting said soft, bulky material for said sheath from the group consisting of mineral fibers, natural fibers and synthetic fibers.
Claim 27
Dependent Claim
238 words
A multiple plane dryer felt for processing a paper web, said dryer felt comprising: machine direction and cross machine direction yarns interwoven in a binding relationship according to a predetermined weave pattern to provide a multiple plane fabric including at least a top plane having a paper-contacting surface and a base plane having a machine roll contacting surface, said base plane being defined entirely by a first plurality of said cross machine direction yarns, and said top plane being defined entirely by a second plurality of said cross machine direction yarns, all of said yarns of said first plurality being selected from the group consisting essentially of synthetic monofilaments, multifilaments, and spun staple fibers, and all of said yarns of said second plurality being encapsulated yarns, each of said encapsulated yarns comprising a monofilament core and an encapsulating sheath completely surrounding and covering the full length of said core, said sheath defining a soft, bulky outer surface which, when woven into said fabric, acts to prevent yarn migration of said encapsulated yarns in said fabric and wherein said encapsulated yarns reduce undue marking of said paper web while contributing to fabric stability, said machine direction yarns being interwoven with said first plurality of cross machine direction yarns to define said machine roll contacting surface on said base plane and interwoven with said second plurality of cross machine direction yarns to define said paper-contacting surface on said top plane.
Claim 28
Dependent Claim
238 words
A multiple plane dryer felt for processing a paper web, said dryer felt comprising: machine direction and cross machine direction yarns interwoven in a binding relationship according to a predetermined weave pattern to provide a multiple plane fabric including at least a top plane having a paper-contacting surface and a base plane having a machine roll contacting surface, said base plane being defined entirely by a first plurality of said cross machine direction yarns, and said top plane being defined entirely by a second plurality of said cross machine direction yarns, all of said yarns of said first plurality being selected from the group consisting essentially of synthetic monofilaments, multifilaments, and spun staple fibers, and all of said yarns of said second plurality being encapsulated yarns, each of said encapsulated yarns comprising a monofilament core and an encapsulating sheath completely surrounding and covering the full length of said core, said sheath defining a soft, bulky outer surface which, when woven into said fabric, acts to prevent yarn migration of said encapsulated yarns in said fabric and wherein said encapsulated yarns reduce undue marking of said paper web while contributing to fabric stability, said machine direction yarns being interwoven with said first plurality of cross machine direction yarns to define said machine roll contacting surface on said base plane and interwoven with said second plurality of cross machine direction yarns to define said paper-contacting surface on said top plane.
Claim 29
Dependent Claim
21 words
The dryer felt according to claim 25, further comprising an intermediate plane positioned between said top plane and said base plane.
Claim 30
Dependent Claim
49 words
The dryer felt according to claim 25, wherein said monofilament core comprises a bundle of straight twistless filaments, each of said filaments having no turns about its axis per unit of length and being treated with a heat resistant resin to make the bundle act like a monofilament fiber.
Claim 31
Dependent Claim
28 words
The dryer felt according to claim 5, wherein said monofilament core is straight and twistless in that it has no turns about its axis per unit of length.
Claim 32
Independent Claim
319 words
A method of making a multiple plane dryer felt for processing a paper web, said dryer felt having a soft, bulky surface, the method comprising the steps of weaving a plurality of machine direction and cross machine direction yarns according to a preselected weave pattern to form a fabric having a top plane defining a paper-contacting surface and a base plane defining a machine roll contacting surface, said weave pattern chosen so that said base plane is defined entirely by a first plurality of said cross machine direction yarns, and said top plane is defined entirely by a second plurality of said cross machine direction yarns, said weave pattern also chosen so that said machine direction yarns are interwoven with said first plurality of cross machine direction yarns to define said machine roll contacting surface on said base plane and interwoven with said second plurality of cross machine direction yarns to define said paper-contacting surface on said top plane, all of said yarns of said first plurality being selected from the group consisting essentially of synthetic monofilaments, multifilaments and spun staple fibers, and all of said yarns of said second plurality being encapsulated yarns, each of said encapsulated yarns comprising a monofilament core and an encapsulating sheath completely surrounding and covering the full length of said core, said sheath defining a soft, bulky outer surface which, when woven into said fabric, acts to prevent yarn migration of said encapsulated yarns in said fabric and wherein said encapsulated yarns reduce undue marking of said paper web said encapsulated yarns comprising a monofilament core and an encapsulating sheath completely surrounding and covering the full length of said core, said sheath defining a soft, bulky outer surface which, when woven into said fabric, acts to prevent yarn migration of said encapsulated yarns in said fabric, and wherein said encapsulated yarns reduce undue marking of said paper web while contributing to fabric stability.
Claim 33
Independent Claim
319 words
A method of making a multiple plane dryer felt for processing a paper web, said dryer felt having a soft, bulky surface, the method comprising the steps of weaving a plurality of machine direction and cross machine direction yarns according to a preselected weave pattern to form a fabric having a top plane defining a paper-contacting surface and a base plane defining a machine roll contacting surface, said weave pattern chosen so that said base plane is defined entirely by a first plurality of said cross machine direction yarns, and said top plane is defined entirely by a second plurality of said cross machine direction yarns, said weave pattern also chosen so that said machine direction yarns are interwoven with said first plurality of cross machine direction yarns to define said machine roll contacting surface on said base plane and interwoven with said second plurality of cross machine direction yarns to define said paper-contacting surface on said top plane, all of said yarns of said first plurality being selected from the group consisting essentially of synthetic monofilaments, multifilaments and spun staple fibers, and all of said yarns of said second plurality being encapsulated yarns, each of said encapsulated yarns comprising a monofilament core and an encapsulating sheath completely surrounding and covering the full length of said core, said sheath defining a soft, bulky outer surface which, when woven into said fabric, acts to prevent yarn migration of said encapsulated yarns in said fabric and wherein said encapsulated yarns reduce undue marking of said paper web said encapsulated yarns comprising a monofilament core and an encapsulating sheath completely surrounding and covering the full length of said core, said sheath defining a soft, bulky outer surface which, when woven into said fabric, acts to prevent yarn migration of said encapsulated yarns in said fabric, and wherein said encapsulated yarns reduce undue marking of said paper web while contributing to fabric stability.
Claim 34
Dependent Claim
53 words
The method of claim 29, further comprising the steps of making said monofilament core from a bundle of straight twistless filaments, each of said filaments having no turns about its axis per unit of length and treating said bundle with a heat reisitant resin to make the bundle act like a monofilament fiber.
Claim 35
Dependent Claim
26 words
The method of claim 29, wherein said monofilament core is straight and twistless in that it has no turns about its axis per unit of length.
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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) | 1985-05-03 | 1985-11-02 | 1986-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-03 | 1989-11-02 | 1990-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-03 | 1993-11-02 | 1994-05-04 | $7700.00 | Window Closed / Lapsed |