US4883709A
Expired / Lapsed
US
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Composite non-woven fabric and process for preparing such non-woven fabric
Assignee: Unicharm Corp
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Filing: 1988-10-24
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Granted: 1989-11-28
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Expires: 2008-10-24
Abstract
Abstract Here are disclosed a composite non-woven fabric having a high dimensional stability and a process for preparing such non-woven fabaric. This non-woven fabric is prepared by a cross-stretching starting non-woven fabric obtained by a fiber entanglement treatment of a staple fiber web by fluid jets to form a substrate, then introducing short fibers onto this cross-stretched substrate and filling said cross-stretched substrate with said short fibers by further fiber entanglement treatment also by fluid jets. Such composite non-woven fabric is suitable particularly as cloth for disposable medican garments or the like.
Inventors
- 👤 Satoshi Nozaki
- 👤 Shigeo Imai
- 👤 Makoto Ishigami
- 👤 Katsushi Tomida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:33
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/425; B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; B32B5/02; B32B5/022; D04H1/4326; D04H1/435; D04H1/44; D04H1/46; D04H1/492; A; A41; A41D; A41D13/00; A41D13/12; B32B38/00; B32B38/0012; B32B2038/0028; B32B2262/00; B32B2262/02; B32B2262/0276; B32B2307/00; B32B2307/70; B32B2307/732; B32B2307/734; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/253; Y10T442/00; Y10T442/60; Y10T442/689; Y10T442/697
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
95 words
A composite nonwoven fabric comprising a nonwoven fabric substrate composed of first staple fibers and second short fibers entangled on and in said nonwoven fabric substrate under action of fluid, characterized by that said substrate comprising a fiber-entangled nonwoven fabric stretched in cross direction by 20 to 200% and that traces of fluid jets are formed on a layer of said fabric comprising predominately the second short fibers, which are more closely spaced from one another than traces of the fluid jets formed on a layer of said fabric comprising predominately the first staple fibers.
Claim 2
Dependent Claim
95 words
A composite nonwoven fabric comprising a nonwoven fabric substrate composed of first staple fibers and second short fibers entangled on and in said nonwoven fabric substrate under action of fluid, characterized by that said substrate comprising a fiber-entangled nonwoven fabric stretched in cross direction by 20 to 200% and that traces of fluid jets are formed on a layer of said fabric comprising predominately the second short fibers, which are more closely spaced from one another than traces of the fluid jets formed on a layer of said fabric comprising predominately the first staple fibers.
Claim 3
Dependent Claim
29 words
The composite nonwoven fabric according to claim 1, wherein a ratio by weight of said second short fibers with respect to the first staple fibers is at least 1/4.
Claim 4
Dependent Claim
29 words
The composite nonwoven fabric according to claim 1, wherein said first staple fiber has a fiber length of 20 to 130 mm and a fineness of 0.7 to 6d.
Claim 5
Dependent Claim
27 words
The composite nonwoven fabric according to claim 1, wherein said second short fiber has a fiber length less than 25 mm and a fineness less than 3d.
Claim 6
Dependent Claim
16 words
The composite nonwoven fabric according to claim 1, wherein said first staple fibers are polyester fibers.
Claim 7
Dependent Claim
25 words
The composite nonwoven fabric according to claim 1, wherein said second short fibers comprise any one or a combination of pulp fibers and synthetic fibers.
Claim 8
Dependent Claim
26 words
An operating room gown or drape prepared from the composite nonwoven fabric according to claim 1, wherein said second short fibers comprise at least pulp fibers.
Claim 9
Dependent Claim
49 words
The operating room gown or drape prepared from the composite nonwoven fabric according to claim 7, wherein said second short fibers comprise a mixture of 10 to 70% by weight of pulp fibers and 30 to 90% by weight of synthetic fibers having a fineness of 0.1 to 3d.
Claim 10
Dependent Claim
54 words
The operating room gown or drape prepared from the composite nonwoven fabric according to claim 7, wherein the nonwoven fabric substrate comprising said first staple fibers has a basic weight of 20 g/m 2 and a lamellar material including said second short fibers has a basic weight of 25 to 100 g/m 2 .
Claim 11
Dependent Claim
183 words
A process for preparing composite nonwoven fabrics comprising: (a) in a first step subjecting a fibrous web comprising first staple fibers to a water jet treatment on a support to thereby form a fiber-entangled nonwoven fabric substrate; (b) in a second step cross-stretching said substrate by 20 to 200%; (c) in a third step introducing second short fibers in the form of a sheet or slurry onto said cross-stretched substrate; (d) in a fourth step subjecting the product resulting from step (c) to the action of a plurality of water jets at a velocity of at least 40 m/sec and under a pressure of at least 10 kg/cm 2 , said water jets being more closely spaced from one another than the traces of the jets which have been formed on said stretched substrate as a result of step (b) on a support comprising a netlike support or perforated plate having a opening ratio of 2.5 to 50% so as to entangle said second short fibers among the fibers of said cross-stretched substrate and thereby to fill the interstices of said substrate fibers.
Claim 12
Dependent Claim
183 words
A process for preparing composite nonwoven fabrics comprising: (a) in a first step subjecting a fibrous web comprising first staple fibers to a water jet treatment on a support to thereby form a fiber-entangled nonwoven fabric substrate; (b) in a second step cross-stretching said substrate by 20 to 200%; (c) in a third step introducing second short fibers in the form of a sheet or slurry onto said cross-stretched substrate; (d) in a fourth step subjecting the product resulting from step (c) to the action of a plurality of water jets at a velocity of at least 40 m/sec and under a pressure of at least 10 kg/cm 2 , said water jets being more closely spaced from one another than the traces of the jets which have been formed on said stretched substrate as a result of step (b) on a support comprising a netlike support or perforated plate having a opening ratio of 2.5 to 50% so as to entangle said second short fibers among the fibers of said cross-stretched substrate and thereby to fill the interstices of said substrate fibers.
Claim 13
Dependent Claim
46 words
The process according to claim 10 wherein the orifices of the jets used in step (d) are arranged at a closer pitch than the pitch of jet traces formed on said cross-stretched substrate, and each of said orifices has a diameter of 0.05 to 0.25 mm.
Claim 14
Dependent Claim
25 words
A process according to claim 10 wherein the orifices of the jets used in step (d) are arranged at a pitch less than 1 mm.
Claim 15
Dependent Claim
12 words
A composite nonwoven fabric produced according to the process of claim 10.
Claim 16
Dependent Claim
27 words
The process according to claim 10 wherein the ratio by weight of said second short fibers with respect to the first staple fibers in at least 1/4.
Claim 17
Dependent Claim
27 words
The process according to claim 10 wherein said first staple fiber has a fiber length of 20 to 130 mm and a fineness of 0.7 to 6d.
Claim 18
Dependent Claim
25 words
The process according to claim 10 wherein said second short fiber has a fiber length less than 25 mm and a fineness less than 3d.
Claim 19
Dependent Claim
14 words
The process according to claim 10 wherein said first staple fibers and polyester fibers.
Claim 20
Dependent Claim
23 words
The process according to claim 10 wherein said second short fibers are selected from the group consisting of pulp fibers and synthetic fibers.
References Cited (Backward Citations)
US4442161A
Cited
US4705712A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-27 | 1993-05-29 | 1993-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-27 | 1997-05-29 | 1997-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-27 | 2001-05-29 | 2001-11-28 | $7700.00 | Window Closed / Lapsed |