US5021050A
Expired / Lapsed
US
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Absorbent panel structure
Assignee: Weyerhaeuser Co
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Filing: 1989-12-11
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Granted: 1991-06-04
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Expires: 2009-12-11
Abstract
Abstract An absorbent panel structure, for use in a disposable diaper or the like, comprising at least about 400 percent by weight of superabsorbent material and at least one wicking layer of hydrophilic fiber particles. The absorbent panel has an average Taber stiffness value in the machine direction of less than about 7 and an absorptive capacity of at least about 300 ml.
Inventors
- 👤 Michael J. Iskra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:20
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/53; A61F13/534; A61F13/537; A61F13/53708; A61F13/53713; A61F13/53743; A61F13/53747; A61F13/53756; A61F13/45; A61F13/49; A61F13/49007; A61F13/49009; A61F13/49011; A61F13/491; A61F13/494; A61F13/49406; A61F13/49413; A61F13/531; A61F13/532; A61F13/533; A61F13/15203; A61F2013/15284; A61F2013/15357; A61F2013/15406; A61F13/47; A61F2013/4708; A61F2013/4948; A61F13/51; A61F13/514; A61F13/51401; A61F2013/51409; A61F2013/530481; A61F2013/530489; A61F2013/530496; A61F2013/53051; A61F2013/530532; A61F2013/530569; A61F2013/530583; A61F2013/530591; A61F2013/5307; A61F2013/530708; A61F2013/530868; A61F2013/530927; A61F2013/530934; A61F2013/530941; A61F2013/530956; A61F2013/530978; A61F2013/53721; A61F13/56; A61F13/58; A61F2013/588
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
163 words
An absorbent panel structure, comprising: an absorbing layer comprised of a substantially high loft, inherently resilient fibrous web containing at least about 400 percent dry basis weight of superabsorbent material to the dry basis weight of the fibers distributed therein, said fibrous web being maintained in a compressed state by said superabsorbent material such that upon wetting of said superabsorbent material said fibrous web expands from its compressed state due to the inherent resilience of said fibrous web to facilitate swelling of said superabsorbent material; at least one wicking layer of densified hydrophilic fiber particles, said at least one wicking layer being coextensive with at least a portion of a respective expansive surface of said fibrous web to promote liquid transport within said absorbing layer; and said absorbent panel having an average Taber stiffness value in the machine direction of less than about 7, a panel weight of at least about 21 grams, and an absorptive capacity of at least about 300 ml.
Claim 2
Dependent Claim
163 words
An absorbent panel structure, comprising: an absorbing layer comprised of a substantially high loft, inherently resilient fibrous web containing at least about 400 percent dry basis weight of superabsorbent material to the dry basis weight of the fibers distributed therein, said fibrous web being maintained in a compressed state by said superabsorbent material such that upon wetting of said superabsorbent material said fibrous web expands from its compressed state due to the inherent resilience of said fibrous web to facilitate swelling of said superabsorbent material; at least one wicking layer of densified hydrophilic fiber particles, said at least one wicking layer being coextensive with at least a portion of a respective expansive surface of said fibrous web to promote liquid transport within said absorbing layer; and said absorbent panel having an average Taber stiffness value in the machine direction of less than about 7, a panel weight of at least about 21 grams, and an absorptive capacity of at least about 300 ml.
Claim 3
Dependent Claim
24 words
The absorbent panel structure as defined in claim 1 wherein said absorbent panel has a basis weight less than about 17.0 oz/yd 2 .
Claim 4
Dependent Claim
28 words
The absorbent panel structure as defined in claim 1 wherein said absorbent panel has a basis weight from about 12.0 oz/yd 2 to about 17.0 oz/yd 2 .
Claim 5
Dependent Claim
41 words
The absorbent panel structure as defined in claim 1 wherein the dry basis weight of the superabsorbent material distributed in said absorbing layer is from about 600 percent to about 1000 percent of the dry basis weight of said fibrous web.
Claim 6
Dependent Claim
24 words
The absorbent panel structure as defined in claim 1 has a surface area from about 62 in 2 to about 92 in 2 .
Claim 7
Dependent Claim
31 words
The absorbent panel structure as defined in claim 1 wherein said at least one wicking layer has a basis weight from about 5.0 oz/yd 2 to about 10.0 oz/yd 2 .
Claim 8
Dependent Claim
16 words
The absorbent panel structure as defined in claim 1 wherein said absorbent panel structure is microcorrugated.
Claim 9
Dependent Claim
26 words
The absorbent panel structure as defined in claim 7 wherein said absorbent panel structure has a moisture content as made of less than about 6.0 percent.
Claim 10
Dependent Claim
16 words
The absorbent panel structure as defined in claim 1 wherein said absorbent panel structure is perfembossed.
Claim 11
Dependent Claim
21 words
The absorbent panel structure as defined in claim 1 has a panel weight from about 21 grams to about 40 grams.
Claim 12
Dependent Claim
24 words
The absorbent panel structure as defined in claim 10 has a basis weight from about 14.0 oz/yd 2 to about 17.0 oz/yd 2 .
Claim 13
Dependent Claim
21 words
The absorbent panel structure as defined in claim 1 has a panel weight from about 28 grams to about 38 grams.
Claim 14
Dependent Claim
199 words
A disposable diaper including an absorbent panel positioned between a substantially liquid impervious backing sheet and a relatively liquid pervious facing sheet, said absorbent panel comprising: an absorbing layer comprised of a substantially high loft, inherently resilient fibrous web containing about 400 percent to about 1200 percent dry basis weight of superabsorbent material to the dry basis weight of the fibers distributed therein, said fibrous web being maintained in a compressed state by said superabsorbent material such that upon wetting of said superabsorbent material said fibrous web expands from its compressed state due to the inherent resilience of said fibrous web to facilitate swelling of said superabsorbent material; at least one wicking layer of densified hydrophilic fiber particles, said at least one wicking layer being coextensive with at least a portion of a respective expansive surface of said fibrous web to promote liquid transport within said absorbing layer; said absorbent panel having a basis weight from about 12.0 oz/yd 2 to about 17.0 oz/yd 2 , a panel weight of at least about 21 grams, an average Taber stiffness value in the machine direction of less than about 7 and an absorptive capacity of at least about 300 ml.
Claim 15
Dependent Claim
199 words
A disposable diaper including an absorbent panel positioned between a substantially liquid impervious backing sheet and a relatively liquid pervious facing sheet, said absorbent panel comprising: an absorbing layer comprised of a substantially high loft, inherently resilient fibrous web containing about 400 percent to about 1200 percent dry basis weight of superabsorbent material to the dry basis weight of the fibers distributed therein, said fibrous web being maintained in a compressed state by said superabsorbent material such that upon wetting of said superabsorbent material said fibrous web expands from its compressed state due to the inherent resilience of said fibrous web to facilitate swelling of said superabsorbent material; at least one wicking layer of densified hydrophilic fiber particles, said at least one wicking layer being coextensive with at least a portion of a respective expansive surface of said fibrous web to promote liquid transport within said absorbing layer; said absorbent panel having a basis weight from about 12.0 oz/yd 2 to about 17.0 oz/yd 2 , a panel weight of at least about 21 grams, an average Taber stiffness value in the machine direction of less than about 7 and an absorptive capacity of at least about 300 ml.
Claim 16
Dependent Claim
40 words
The disposable diaper as defined in claim 13 wherein the dry basis weight of the superabsorbent material distributed in said absorbing layer is rom about 600 percent to about 1000 percent of the dry basis weight of said fibrous web.
Claim 17
Dependent Claim
27 words
The disposable diaper as defined in claim 14 wherein said absorbent panel has a surface area from about 62 in 2 to about 92 in 2 .
Claim 18
Dependent Claim
16 words
The disposable diaper as defined in claim 15 wherein said absorbent panel is microcorrugated and perf-embossed.
Claim 19
Dependent Claim
38 words
The disposable diaper as defined in claim 15 wherein said at least one wicking layer includes a wicking layer positioned substantially coextensive with at least a portion of each of the respective expansive surfaces of said absorbing layer.
Claim 20
Dependent Claim
23 words
The disposable diaper as defined in claim 17 wherein said wicking layers have a combined basis weight of about 8.0 oz/yd 2 .
Claim 21
Dependent Claim
22 words
The disposable diaper as defined in claim 17 wherein the basis weight of each of the wicking layers is substantially the same.
Claim 22
Dependent Claim
23 words
The disposable diaper as defined in claim 13 herein said absorbent panel has a weight from about 28 grams to about 38 grams.
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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) | 1994-06-03 | 1994-12-03 | 1995-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-03 | 1998-12-03 | 1999-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-03 | 2002-12-03 | 2003-06-04 | $7700.00 | Window Closed / Lapsed |