US4420529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-static dryer fabrics
Assignee: BASF Corp
•
Filing: 1980-08-22
•
Granted: 1983-12-13
•
Expires: 2000-08-22
Abstract
Abstract A dryer felt or fabric with a reduced potential for creating static electricity when running on a papermaking machine. The fabric is woven from a number of machine direction and cross-machine direction yarns with selected machine direction and/or cross-machine direction yarns comprising a blend of anti-static yarn combined with other yarns. The anti-static yarn may take the form of a staple, continuous filament or monofilament and may be a carbon content acrylic anti-static fiber, a silver coated nylon continuous filament, a nylon monofilament coated with carbon, or an acrylic fiber carbon coated. After being woven, the fabric is typically resin treated with a heat-resistant resin.
Inventors
- 👤 William T. Westhead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:41
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/0027; D21F1/0036; D03; D03D; D03D15/00; D03D15/50; D03D15/533; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S57/00; Y10S57/901; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/2929; Y10T428/2933; Y10T428/294; Y10T428/2958; Y10T428/30; Y10T442/00; Y10T442/30; Y10T442/3049; Y10T442/3179; Y10T442/3382; Y10T442/339; Y10T442/3976
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
92 words
A dryer fabric having face and back surfaces, said dryer fabric comprising: a plurality of machine direction and cross-machine direction yarns interwoven to define machine roll contacting floats on both the face and back surfaces of said fabric, a select number of the yarns that define said floats being anti-static yarns, said select number of yarns chosen so that floats defined by anti-static yarns are present on both the face and back surfaces of said fabric, each of said anti-static yarns comprising a non-conductive synthetic yarn incorporating a component exhibiting anti-static properties.
Claim 2
Dependent Claim
92 words
A dryer fabric having face and back surfaces, said dryer fabric comprising: a plurality of machine direction and cross-machine direction yarns interwoven to define machine roll contacting floats on both the face and back surfaces of said fabric, a select number of the yarns that define said floats being anti-static yarns, said select number of yarns chosen so that floats defined by anti-static yarns are present on both the face and back surfaces of said fabric, each of said anti-static yarns comprising a non-conductive synthetic yarn incorporating a component exhibiting anti-static properties.
Claim 3
Dependent Claim
16 words
The dryer fabric of claim 1, wherein said anti-static yarns are confined to the machine direction.
Claim 4
Dependent Claim
16 words
The dryer fabric of claim 1, wherein said anti-static yarns are confined to the cross-machine direction.
Claim 5
Dependent Claim
17 words
The dryer fabric of claim 1, wherein said woven fabric is resin treated with a heat-resistant resin.
Claim 6
Dependent Claim
18 words
The dryer fabric of claim 1, wherein said machine direction and cross-machine direction yarns comprise resin treated yarns.
Claim 7
Dependent Claim
20 words
The dryer fabric of claim 2, wherein said anti-static yarns represent approximately 0.525% by weight of said machine direction yarns.
Claim 8
Dependent Claim
23 words
The dryer fabric of claim 2, wherein said anti-static yarns represent approximately 0.1% to approximately 10.0% by weight of said machine direction yarns.
Claim 9
Dependent Claim
23 words
The dryer fabric of claim 2, wherein said anti-static yarns represent approximately 0.1% to approximately 4.0% by weight of said machine direction yarns.
Claim 10
Dependent Claim
17 words
The dryer fabric of claim 1, wherein the remaining machine and cross-machine direction yarns comprise hydrophobic yarns.
Claim 11
Dependent Claim
24 words
The dryer fabric of claim 9, wherein said hydrophobic yarns are chosen from the group consisting of polyester yarns, polyamide yarns, and acrylic yarns.
Claim 12
Dependent Claim
15 words
The dryer fabric of claim 1, wherein said cross-machine direction yarns all comprise hydrophobic yarns.
Claim 13
Dependent Claim
24 words
The dryer fabric of claim 11, wherein said hydrophobic yarns are chosen from the group consisting of polyester yarns, polyamide yarns, and acrylic yarns.
Claim 14
Dependent Claim
11 words
The dryer fabric of claim 1, wherein said floats are knuckles.
Claim 15
Dependent Claim
13 words
The dryer fabric of claim 1, wherein said floats are warp direction floats.
Claim 16
Dependent Claim
13 words
The dryer fabric of claim 1, wherein said floats are weft direction floats.
Claim 17
Dependent Claim
13 words
The dryer fabric of claim 13, wherein said knuckles are machine direction knuckles.
Claim 18
Dependent Claim
13 words
The dryer fabric of claim 13, wherein said knuckles are cross-machine direction knuckles.
Claim 19
Dependent Claim
18 words
The dryer fabric of claim 1, wherein said anti-static yarn comprises an acylic yarn with carbon dispersed therein.
Claim 20
Dependent Claim
18 words
The dryer fabric of claim 18, wherein said acrylic yarn is in the form of a staple fiber.
Claim 21
Dependent Claim
18 words
The dryer fabric of claim 18, wherein said acylic yarn is in the form of a continuous filament.
Claim 22
Dependent Claim
17 words
The dryer fabric of claim 1, wherein said anti-static yarn comprises a polyamide core coated with silver.
Claim 23
Dependent Claim
14 words
The dryer fabric of claim 21, wherein said nylon core is a continuous filament.
Claim 24
Dependent Claim
25 words
The dryer fabric of claim 1, wherein said anti-static yarn comprises a monofilament core and a carbon coating disposed about the surface of said core.
Claim 25
Dependent Claim
13 words
The dryer fabric of claim 23, wherein said monofilament core comprises polyamide fiber.
Claim 26
Dependent Claim
18 words
The dryer fabric of claim 1, wherein said anti-static yarns are in both the machine and cross-machine directions.
Claim 27
Dependent Claim
48 words
The dryer fabric of claim 1, wherein said floats are defined on both said face and back surfaces, said floats on one of said face and back surfaces being machine direction floats and said floats on the other of said face and back surfaces being cross-machine direction floats.
Claim 28
Dependent Claim
11 words
The dryer fabric of claim 1, wherein said floats are knuckles.
Claim 29
Dependent Claim
48 words
The dryer fabric of claim 1, further comprising additional machine roll contacting floats disposed across the back surface of said fabric, said additional floats being defined by said machine direction and cross-machine direction yarns, a select number of the yarns that define said additional floats being anti-static yarns.
Claim 30
Dependent Claim
17 words
The dryer fabric of claim 1 wherein said anti-static component is dispersed throughout the non-conductive synthetic yarn.
Claim 31
Dependent Claim
12 words
The dryer fabric of claim 1 wherein said anti-static component is non-metallic.
References Cited (Backward Citations)
US2949134A
Cited
US3067779A
Cited
US3306322A
Cited
US3582445A
Cited
US3507019A
Cited
US3678675A
Cited
US3639807A
Cited
US3778331A
Cited
US4015038A
Cited
US4184519A
Cited
US4239065A
Cited
US4232082A
Cited
US4259394A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-12 | 1987-06-13 | 1987-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-12 | 1991-06-13 | 1991-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-12 | 1995-06-13 | 1995-12-13 | $7700.00 | Window Closed / Lapsed |