Patent US5143779A successfully refreshed from Google Patents.
US5143779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rebulkable nonwoven fabric
Assignee: Fitesa Simpsonville Inc
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Filing: 1988-12-23
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Granted: 1992-09-01
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Expires: 2008-12-23
Abstract
Abstract Disclosed is a process for making bulky nonwoven fabric suitable for use in diaper constructions that comprises the steps of (a) forming a web of one or more layers comprised at least in part of thermoplastic bicomponent fibers, (b) bonding said web by means of a thru-air system, (c) compressing--either in a nip or by winding--the resulting bonded web to increase its density, (d) transporting and/or otherwise manipulating the compressed web, and (e) subsequently transforming said compressed web, by means of exposure to heat, into the low density bulky nonwoven fabric. The bulky nonwoven fabrics are particularly useful as diaper coverstock and as diaper spacer fabrics.
Inventors
- 👤 David D. Newkirk
- 👤 Henry S. Ostrowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:05
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4282; D04H1/4291; D04H1/4326; D04H1/435; D04H1/4374; D04H1/4382; D04H1/43825; D04H1/43828; D04H1/43832; D04H1/43835; D04H1/4391; D04H1/43918; D04H1/70; D04H1/74; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/24992; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2931; Y10T442/00; Y10T442/60; Y10T442/637; Y10T442/641
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
90 words
A bulky nonwoven fabric suitable for use in constructing absorbent personal care products, and resulting from the heat treatment of a dense precursor nonwoven fabric, said dense precursor nonwoven fabric comprising crimped thermoplastic bicomponent fibers and having a basis weight in the range of 10-40 grams per square yarn, said bulky nonwoven fabric having a substantially greater bulk than said dense precursor nonwoven fabric such that the ratio of the density of the dense precursor nonwoven fabric to the density of the bulky nonwoven fabric is at least about 1.4.
Claim 2
Dependent Claim
90 words
A bulky nonwoven fabric suitable for use in constructing absorbent personal care products, and resulting from the heat treatment of a dense precursor nonwoven fabric, said dense precursor nonwoven fabric comprising crimped thermoplastic bicomponent fibers and having a basis weight in the range of 10-40 grams per square yarn, said bulky nonwoven fabric having a substantially greater bulk than said dense precursor nonwoven fabric such that the ratio of the density of the dense precursor nonwoven fabric to the density of the bulky nonwoven fabric is at least about 1.4.
Claim 3
Dependent Claim
32 words
A nonwoven fabric according to claim 1 wherein the crimped thermoplastic bicomponent fibers are chosen from the group consisting of sheath/core fibers of the following resin combinations: polyethylene/polypropylene, polyethylene/polyester, polypropylene/polyester, and copolyester/polyester.
Claim 4
Dependent Claim
19 words
A nonwoven fabric according to claim 2 wherein the crimped thermoplastic bicomponent fibers comprise 3 denier polyethylene/polyester sheath/core fibers.
Claim 5
Dependent Claim
49 words
A nonwoven fabric according to claim 1 composed of two bonded layers of compatible crimped thermoplastic bicomponent fibers, wherein said fibers are selected such that the fibers of one layer are chosen to provide optimum softness while the fibers of the other layer are chose to provide maximum loft.
Claim 6
Dependent Claim
24 words
A bulky nonwoven fabric according to claim 1 wherein said dense precursor nonwoven fabric contains up to 50% by weight single component matrix fibers.
Claim 7
Dependent Claim
20 words
A nonwoven fabric according to claim 1 wherein the precursor has been made by a process that includes thru-air bonding.
Claim 8
Dependent Claim
21 words
A nonwoven fabric according to claim 6 wherein said thru-air bonding has been conducted in the absence of a hold-down wire.
Claim 9
Dependent Claim
32 words
A nonwoven fabric according to claim 6 wherein said thru-air bonding has been accomplished by the use of bonding surfaces such as wires or drums that have approximately 25-60 percent open area.
Claim 10
Dependent Claim
26 words
A nonwoven fabric according to claim 8 where said bonding surface has 30-40% open area and has been conducted in the absence of a hold-down wire.
Claim 11
Dependent Claim
29 words
A nonwoven fabric according to claim 1, wherein said fabric is characterized by a caliper, under a compression of 107 grams per square inch, of at least 20 mils.
Claim 12
Dependent Claim
12 words
A nonwoven fabric according to claim 1 suitable for use as coverstock.
Claim 13
Dependent Claim
19 words
A nonwoven fabric according to claim 1 suitable for use as spacer fabric incorporated within an absorbent product structure.
Claim 14
Dependent Claim
24 words
A nonwoven fabric according to claim 12 suitable for use as spacer fabric between the coverstock and the absorbent core of a disposable diaper.
Claim 15
Dependent Claim
99 words
The bulky nonwoven fabric product made by the process comprising the steps of: (a) forming an initial web of one or more layers comprised of thermoplastic bicomponent fibers, (b) bonding said web by means of a through-air system, (c) compressing the resulting bonded web to increase its density, (d) transporting and/or otherwise manipulating the compressed web, and (e) subsequently transforming said compressed web, by means of exposure to heat, into low density nonwoven fabric such that the ratio of the density of the compressed web to the density of the low density nonwoven fabric is at least about 1.4.
Claim 16
Dependent Claim
99 words
The bulky nonwoven fabric product made by the process comprising the steps of: (a) forming an initial web of one or more layers comprised of thermoplastic bicomponent fibers, (b) bonding said web by means of a through-air system, (c) compressing the resulting bonded web to increase its density, (d) transporting and/or otherwise manipulating the compressed web, and (e) subsequently transforming said compressed web, by means of exposure to heat, into low density nonwoven fabric such that the ratio of the density of the compressed web to the density of the low density nonwoven fabric is at least about 1.4.
Claim 17
Dependent Claim
11 words
The product of claim 14 when used as a diaper coversheet.
Claim 18
Dependent Claim
16 words
The product of claim 14 when used as spacer fabric incorporated within the absorbent product structure.
Claim 19
Dependent Claim
76 words
A nonwoven fabric having a basis weight in the range of 10-40 grams per square yard that comprises crimped thermoplastic bicomponent fibers, wherein said fabric is capable of undergoing a substantial increase in bulk by the application of heat thereto, such that the ratio of the density of the nonwoven fabric prior to the application of heat thereto, to the density of the nonwoven fabric following the application of heat thereto, is at least about 1.4.
Claim 20
Dependent Claim
76 words
A nonwoven fabric having a basis weight in the range of 10-40 grams per square yard that comprises crimped thermoplastic bicomponent fibers, wherein said fabric is capable of undergoing a substantial increase in bulk by the application of heat thereto, such that the ratio of the density of the nonwoven fabric prior to the application of heat thereto, to the density of the nonwoven fabric following the application of heat thereto, is at least about 1.4.
Claim 21
Dependent Claim
15 words
A diaper wherein a rebulked fabric according to claim 1 is used as the topsheet.
Claim 22
Dependent Claim
15 words
A diaper wherein a rebulked fabric according to claim 10 is used as the topsheet.
Claim 23
Dependent Claim
14 words
A diaper wherein the rebulked fabric of claim 14 is used as the topsheet.
Claim 24
Dependent Claim
33 words
A diaper according to claim 20 wherein the compressed web is transformed into a low density bulky nonwoven fabric by means of exposure to heat in an operation preceding incorporation into the diaper.
Claim 25
Dependent Claim
33 words
A diaper according to claim 20 wherein the compressed web is transformed into a low density bulky nonwoven fabric by means of exposure to heat during the process of forming the finished diaper.
Claim 26
Dependent Claim
23 words
A diaper wherein a rebulked fabric according to claim 1 is used as a spacer fabric between the coverstock and the absorbent core.
Claim 27
Dependent Claim
22 words
A diaper wherein the rebulked fabric of claim 14 is used as a spacer fabric between the coverstock and the absorbent core.
References Cited (Backward Citations)
US3669788A
Cited
GB1334735A
Cited
US3964232A
Cited
US3911641A
Cited
US3927504A
Cited
US3991538A
Cited
US4068036A
Cited
US4163353A
Cited
US4041951A
Cited
US4391869A
Cited
US4424258A
Cited
GB2127865A
Cited
US4592943A
Cited
US4774124A
Cited
US4601937A
Cited
US4548856A
Cited
US4652484A
Cited
US4673402A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-01 | 1996-03-02 | 1996-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-01 | 2000-03-02 | 2000-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-01 | 2004-03-02 | 2004-09-01 | $7700.00 | Window Closed / Lapsed |