US4902559A
Expired / Lapsed
US
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Absorbent body of nonwoven material and a method for the production thereof
Assignee: Carl Freudenberg KG
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Filing: 1988-05-11
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Granted: 1990-02-20
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Expires: 2008-05-11
Abstract
Abstract Disclosed is an absorbent body of nonwoven material formed of randomly distributed thermoplastic endless filaments which contain embedded hydrophilic or oleophilic staple fibers and in some cases swelling particles. Also disclosed is a one-step process for the production of the absorbent body.
Inventors
- 👤 Helmut Eschwey
- 👤 Lothar Hackler
- 👤 Ludwig Hartmann
- 👤 Michael Kauschke
- 👤 Bernhard Klein
- 👤 Thomas Kumpel
- 👤 Hans-Achim Kunkel
- 👤 Torsten Nahe
- 👤 Ivo Ruzek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:57
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4266; A; A61; A61F; A61F13/00; A61F13/15; A61F13/53; D04H1/425; D04H1/4258; D04H5/00; D04H5/06; A61F2013/530131; A61F2013/530343; A61F2013/530364; A61F2013/530481; Y; Y10; Y10T; Y10T442/00; Y10T442/60; Y10T442/608; Y10T442/699
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
79 words
An absorbent body comprising: a nonwoven material of hydrophilic or oleophilic fibers of 1 to 50 mm length in a single-layer network having a total density of 0.05 to 0.5 g/cm 3 and a matrix of thermoplastic endless filaments of circular cross section and a high degree of orientation, arranged in a three-dimensional random texture in which the fibers are distributed in a spatially uniform manner in an amount of 40 to 90 wt.- % of the total body.
Claim 2
Dependent Claim
79 words
An absorbent body comprising: a nonwoven material of hydrophilic or oleophilic fibers of 1 to 50 mm length in a single-layer network having a total density of 0.05 to 0.5 g/cm 3 and a matrix of thermoplastic endless filaments of circular cross section and a high degree of orientation, arranged in a three-dimensional random texture in which the fibers are distributed in a spatially uniform manner in an amount of 40 to 90 wt.- % of the total body.
Claim 3
Dependent Claim
16 words
The absorbent body of claim 1 further comprising 2 to 50 weight-percent of a polymeric superabsorber.
Claim 4
Dependent Claim
17 words
The absorbent body of claim 2 wherein the super absorber is embedded in a spatially uniform distribution.
Claim 5
Dependent Claim
11 words
The absorbent body of claim 3 wherein it is greatly compressed.
Claim 6
Dependent Claim
17 words
The absorbent body of claim 4 wherein the thermoplastic filaments are not fused together at their intersections.
Claim 7
Dependent Claim
15 words
The absorbent body of claim 3 wherein the superabsorbers adhere to the fibers and filaments.
Claim 8
Dependent Claim
28 words
The absorbent body of claim 1 wherein the hydrophilic fibers are selected from the group consisting of cellulose, staple rayon, cotton, linters, mechanical wood pulp or mixtures thereof.
Claim 9
Dependent Claim
18 words
The absorbent body of claim 1 wherein the oleophilic fibers consist of polyolefins or oleophilized mechanical wood pulp.
Claim 10
Dependent Claim
145 words
A method for production of an absorbent body according to claim 1 comprising: spinning in a spinning means one or more rows of filaments from a melt; passing the filaments through a stretching zone in a downwardly oriented air stream toward an air permeable support means; adding fibers of 1 to 50 mm length in an amount of 40 to 90 wt.- % to the filaments in a mixing zone to contact said fibers with said filaments when said filaments are no longer tacky, said mixing zone being located in a lower third of the distance between the spinning means and said support means; depositing the filaments and fibers on said support means; controlling the movement of said support means so that the filaments are deposited in a three dimensional, uniform random texture and mixed with said fibers; and aspirating air beneath said support means.
Claim 11
Dependent Claim
33 words
The method of claim 9 wherein superabsorbent polymeric material is added in an amount of 2 to 50 wt.- % with respect to the total weight of the deposited material with said fibers.
Claim 12
Dependent Claim
48 words
The method of claim 9 further comprising: compressing the deposited filaments and fibers with a line pressure of no more than 150 kp/cm under the action of an amount of moisture that is such that it makes the superabsorbent particle surfaces tacky, but without initiating the swelling process.
Claim 13
Dependent Claim
15 words
The method of claim 9 wherein the melt is polypropylene, polyethylene, polyester, polyamide or polyurethane.
Claim 14
Dependent Claim
10 words
The method of claim 9 wherein the fibers are hydrophilic.
Claim 15
Dependent Claim
10 words
The method of claim 9 wherein the fibers are oleophilic.
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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) | 1993-02-19 | 1993-08-21 | 1994-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-19 | 1997-08-21 | 1998-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-19 | 2001-08-21 | 2002-02-20 | $7700.00 | Window Closed / Lapsed |