US4296161A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry-formed nonwoven fabric
Assignee: Procter and Gamble Co
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Filing: 1980-09-26
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Granted: 1981-10-20
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Expires: 2000-09-26
Abstract
Abstract A dry-formed nonwoven fabric; preferably an air lay web; including a fiber composition which is at least 50%, by weight, wood pulp fiber less than about 0.635 cm (1/4 inch) in length with 25% or more of the fiber composition in the web, by weight, being kraft wood pulp fibers, and under 50%, by weight, reinforcing fibers intermixed with the wood pulp fibers throughout the web structure; an embossment in the web providing a plurality of compressed, densified valley regions and less-dense high loft regions; the web including no more than about 5.1 g/m2 (3.0 lbs per ream of 2,880 ft.2) of a binder and having a cross machine direction wet tensile strength no lower than about 0.09 Kg/cm (0.5 lbs/inch), and preferably at least 0.107 Kg/cm (0.6 lbs/inch). A higher cross-machine direction wet tensile strength in excess of 0.267 Kg/cm (1.5 lbs/inch) can be established at a binder level less than 8.5 g/m2 (5 lbs/ream), and preferably at a binder level between 6.8-8.5 g/m2 (4-5 lbs/ream).
Inventors
- 👤 Paul H. Kaiser
- 👤 Rudolf Neuenschwander
- 👤 Henry J. Norton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:31
CPC Classifications
D; D21; D21H; D21H5/00; D21H5/26; D21H5/265; D21H5/2657; D21H5/2671; D21H11/00; D21H11/02; D21H11/04; D21H25/00; D21H27/00; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24595; Y10T428/24603; Y10T428/31504; Y10T428/31971; Y10T428/31989; Y10T442/00; Y10T442/60; Y10T442/69; Y10T442/695
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
120 words
A dry-fornmed nonwoven fibrous web including a fiber composition which is at least 50%, by weight, wood pulp fibers less than about 0.635 cm (1/4 inch) in length with 25% or more of the fiber composition in the web, by weight, being kraft wood pulp fibers, and under 50%, by weight, reinforcing fibers intermixed with the wood pulp fibers throughout the web structure; an embossment in the web providing a plurality of compressed, densified valley regions and less-dense high loft regions, said web including no more than about 5.1 g/m 2 (3.0 lbs per ream of 2,880 ft. 2 ) of a binder and having a cross machine direction wet tensile strength of at least about 0.107 Kg/cm (0.6 lbs./inch).
Claim 2
Dependent Claim
120 words
A dry-fornmed nonwoven fibrous web including a fiber composition which is at least 50%, by weight, wood pulp fibers less than about 0.635 cm (1/4 inch) in length with 25% or more of the fiber composition in the web, by weight, being kraft wood pulp fibers, and under 50%, by weight, reinforcing fibers intermixed with the wood pulp fibers throughout the web structure; an embossment in the web providing a plurality of compressed, densified valley regions and less-dense high loft regions, said web including no more than about 5.1 g/m 2 (3.0 lbs per ream of 2,880 ft. 2 ) of a binder and having a cross machine direction wet tensile strength of at least about 0.107 Kg/cm (0.6 lbs./inch).
Claim 3
Dependent Claim
21 words
The nonwoven web of claim 1 wherein at least 50%, by weight, of the fiber composition is kraft wood pulp fibers.
Claim 4
Dependent Claim
25 words
The nonwoven web of claim 2 wherein the wood pulp fibers are northeastern Kraft wood pulp fibers and the reinforcing fibers are secondary textile fibers.
Claim 5
Dependent Claim
24 words
The nonwoven web of claim 2 or 3 having a cross machine direction wet tensile strength of at least about 0.179 Kg/cm (1.0 lbs./inch).
Claim 6
Dependent Claim
24 words
The nonwoven web of claim 2 wherein the reinforcing fibers constitute from about 10-40%, by weight, of the fiber composition of the web structure.
Claim 7
Dependent Claim
19 words
The nonwoven web of claim 2 wherein the binder incompletely penetrates the web at least in high loft regions.
Claim 8
Dependent Claim
117 words
A dry-formed nonwoven fibrous web including a fiber composition which is at least 50%, by weight, wood pulp fibers less than about 0.635 cm (1/4 inch) in length with 25% or more of the fiber composition in the web, by weight, being kraft wood pulp fibers, and under 50%, by weight, reinforcing fibers intermixed with the wood pulp fibers throughout the web structure; an embossment in th web providing a plurality of compressed, densified valley regions and less-dense high loft regions, said web including no mre than about 3.1 g/m 2 (1.8 lbs/ream of 2,880 ft. 2 ) of a binder and having a cross direction wet tensile strength of at least about 0.093 Kg/cm (0.5 lbs./inch).
Claim 9
Dependent Claim
117 words
A dry-formed nonwoven fibrous web including a fiber composition which is at least 50%, by weight, wood pulp fibers less than about 0.635 cm (1/4 inch) in length with 25% or more of the fiber composition in the web, by weight, being kraft wood pulp fibers, and under 50%, by weight, reinforcing fibers intermixed with the wood pulp fibers throughout the web structure; an embossment in th web providing a plurality of compressed, densified valley regions and less-dense high loft regions, said web including no mre than about 3.1 g/m 2 (1.8 lbs/ream of 2,880 ft. 2 ) of a binder and having a cross direction wet tensile strength of at least about 0.093 Kg/cm (0.5 lbs./inch).
Claim 10
Dependent Claim
21 words
The nonwoven web of claim 1 wherein at least 50%, by weight, of the fiber composition is kraft wood pulp fibers.
Claim 11
Dependent Claim
23 words
The nonwoven fibrous web of claim 8 wherein the cross direction wet tensile strength is at least about 0.107 Kg/cm (0.6 lbs./linear inch).
Claim 12
Dependent Claim
25 words
The nonwoven web of claim 8 wherein the wood pulp fibers are northeastern Kraft wood pulp fibers and the reinforcing fibers are secondary textile fibers.
Claim 13
Dependent Claim
26 words
The nonwoven web of claim 8 or 10 wherein the reinforcing fibers constitute from about 10-40%, by weight, of the fiber composition of the web structure.
Claim 14
Dependent Claim
19 words
The nonwoven web of claim 8 wherein the binder incompletely penetrates the web at least in high loft regions.
Claim 15
Dependent Claim
22 words
The nonwoven web of claim 11 wherein the reinforcing fibers comprise 10%, by weight, of the fiber composition of the web structure.
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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) | 1984-10-19 | 1985-04-20 | 1985-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-19 | 1989-04-20 | 1989-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-19 | 1993-04-20 | 1993-10-20 | $7700.00 | Window Closed / Lapsed |