US4830905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Papermaker's felt incorporating a closed cell polymeric foam layer
Assignee: Appleton Mills
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Filing: 1988-08-22
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Granted: 1989-05-16
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Expires: 2008-08-22
Abstract
Abstract A papermaker's felt having improved water extraction characteristics. The felt is composed of a base fabric, and a layer of a closed cell polymeric foam is disposed on a face of the base fabric. A batt of fibrous material is needled to the base fabric and foam layer. The needling operation penetrates the fibers of the batt into the foam layer, intersecting the cells. The resiliency of the foam tends to close the cell walls against the penetrated fibers so that under uncompressed conditions, the felt is substantially impervious. Under compressive forces, as occurs in the nip between press rolls, the interfaces between the penetrated fibers and the cell walls will open to enable water to be extracted through the felt.
Inventors
- 👤 Thomas G. Gulya
- 👤 Gary V. Schultz
- 👤 Kenneth G. Staiger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:06
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/02; B32B5/06; B32B5/18; B32B5/22; B32B5/24; B32B5/245; D; D21; D21F; D21F7/00; D21F7/08; D21F7/083; B32B2266/00; B32B2266/08; B32B2305/00; B32B2305/02; B32B2305/022; B32B2307/00; B32B2307/70; B32B2307/724; Y; Y10; Y10S; Y10S162/00; Y10S162/90; Y10T; Y10T442/00; Y10T442/50; Y10T442/59; Y10T442/60; Y10T442/647; Y10T442/682
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
42 words
A papermakers felt, comprising a layer of closed cell resilient polymeric foam containing a multiplicity of isolated cells, and a fibrous material needled to said foam layer and including a multiplicity of fibers penetrated into said foam layer and intersecting said cells.
Claim 2
Dependent Claim
42 words
A papermakers felt, comprising a layer of closed cell resilient polymeric foam containing a multiplicity of isolated cells, and a fibrous material needled to said foam layer and including a multiplicity of fibers penetrated into said foam layer and intersecting said cells.
Claim 3
Dependent Claim
53 words
The felt of claim 1, wherein said foam prior to needling has a density of 1.0 to 6.0 lbs per cubic foot, a thickness of 50 to 500 mils, a rigidity of 35 to 150 IFD and an air permeability of 10 to 130 cubic feet per square foot of fabric per minute.
Claim 4
Dependent Claim
25 words
The felt of claim 1, wherein said felt has an air permeability of 10 to 150 cubic feet per square foot of fabric per minute.
Claim 5
Dependent Claim
17 words
The felt of claim 1, wherein said needled felt contains 3500 to 5500 needle penetrations per inch.
Claim 6
Dependent Claim
52 words
A papermakers felt, comprising a layer of closed cell polymeric foam containing a multiplicity of isolated cells, a base fabric, and a fibrous batt needled to said foam layer and to said base fabric to provide a felt structure, said needled felt structure having from 3500 to 5500 needle penetrations per inch.
Claim 7
Dependent Claim
52 words
A papermakers felt, comprising a layer of closed cell polymeric foam containing a multiplicity of isolated cells, a base fabric, and a fibrous batt needled to said foam layer and to said base fabric to provide a felt structure, said needled felt structure having from 3500 to 5500 needle penetrations per inch.
Claim 8
Dependent Claim
93 words
A papermakers felt, comprising a layer of closed cell polymeric foam containing a multiplicity of non-connected cells bordered by cell walls, and a multiplicity of randomly oriented fibers penetrated into said foam layer and intersecting said cell walls, said foam layer prior to penetration of said fibers having a density in the range of 1.0 to 6.0 lbs per cubic foot, a thickness of 50 to 500 mils, a rigidity of 35 to 150 IFD, and an air permeability of 10 to 130 to cubic feet per square foot of fabric per minute.
Claim 9
Dependent Claim
93 words
A papermakers felt, comprising a layer of closed cell polymeric foam containing a multiplicity of non-connected cells bordered by cell walls, and a multiplicity of randomly oriented fibers penetrated into said foam layer and intersecting said cell walls, said foam layer prior to penetration of said fibers having a density in the range of 1.0 to 6.0 lbs per cubic foot, a thickness of 50 to 500 mils, a rigidity of 35 to 150 IFD, and an air permeability of 10 to 130 to cubic feet per square foot of fabric per minute.
Claim 10
Dependent Claim
54 words
The felt of claim 6, wherein the interfaces between said foam and the penetrated fibers under non-compressed conditions of said felt are in substantially sealed relation to substantially prevent liquid flow through said foam layer, and said interfaces under compressed conditions of said felt are opened to permit liquid flow through said foam layer.
References Cited (Backward Citations)
US3059312A
Cited
US3617442A
Cited
US3772746A
Cited
US4271222A
Cited
US4369081A
Cited
US4357386A
Cited
US4469740A
Cited
US4701368A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-15 | 1992-11-14 | 1993-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-15 | 1996-11-14 | 1997-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-15 | 2000-11-14 | 2001-05-16 | $7700.00 | Window Closed / Lapsed |