US4731277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonwoven textile sponge for medicine and hygiene, and methods for the production thereof
Assignee: Carl Freudenberg KG
•
Filing: 1986-06-27
•
Granted: 1988-03-15
•
Expires: 2006-06-27
Abstract
Abstract Disclosed is a nonwoven, textile sponge for use in medical and hygienic applications consisting of at least one outer, thermally consolidated, moisture-repellent fiber layer containing at least 80% synthetic heterofil filaments and at least one layer of absorbent fibers. The sponge is perforated, but does not have any substantial fiber entanglement, and contains no binding agent of any kind. Also disclosed is a method for the manufacture of the sponge, in which the fiber nonwovens are laid one on the other, hydraulically perforated without fiber entanglement, and then thermally consolidated through heterofil filaments.
Inventors
- 👤 Dieter Groitzsch
- 👤 Hans-Jurgen Kuhlwein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:39
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/44; D04H1/46; D04H1/492; D04H1/495; D04H1/498; D04H1/54; D04H3/00; D04H3/02; D04H3/08; D04H3/14; D04H5/00; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1056; Y10T156/1062; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T442/00; Y10T442/60; Y10T442/69; Y10T442/696
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
84 words
A nonwoven textile sponge comprising at least one absorbent fiber layer and at least one perforated water-repellent outer fiber layer covering it on a wound side thereof, the repellent fiber layer consisting of at least 80% of synthetic heterofil filaments having a low-melting and a high-melting component, said fiber layers merged flowingly with one another as a result of heating, wherein the perforated regions contain no substantial fiber entanglement, and the entire material is consolidated thermally exclusively by the bonded filaments without binding agents.
Claim 2
Dependent Claim
84 words
A nonwoven textile sponge comprising at least one absorbent fiber layer and at least one perforated water-repellent outer fiber layer covering it on a wound side thereof, the repellent fiber layer consisting of at least 80% of synthetic heterofil filaments having a low-melting and a high-melting component, said fiber layers merged flowingly with one another as a result of heating, wherein the perforated regions contain no substantial fiber entanglement, and the entire material is consolidated thermally exclusively by the bonded filaments without binding agents.
Claim 3
Dependent Claim
17 words
The sponge of claim 1, wherein the sponge is suitable for use in medical and hygienic applications.
Claim 4
Dependent Claim
23 words
The sponge of claim 1, wherein the absorbent layer contains up to 30% heterofil filaments of the kind used in the water-repellent layer.
Claim 5
Dependent Claim
18 words
The sponge of claim 1, wherein the absorbent layer contains polyvinyl alcohol fibers which soften in hot water.
Claim 6
Dependent Claim
14 words
The sponge of claim 1, wherein the absorbent zone consists exclusively of cellulose layers.
Claim 7
Dependent Claim
15 words
The sponge of claim 1, wherein at least one fiber layer contains shrunken polyester fibers.
Claim 8
Dependent Claim
14 words
The sponge of claim 1, wherein the absorbent layer is mixed with binding fibers.
Claim 9
Independent Claim
128 words
A method for the production of a nonwoven, textile sponge for medicine and hygiene, having at least one absorbent fiber layer containing, in some cases, binding fibers, and at least one external layer containing water-repellent fibers, said water-repellent fiber layer having at least 80% synthetic heterofil filaments with a low-melting and a high-melting component, comprising: covering one of the layers with the other to form a sandwich, hydraulically perforating the sandwich by means of a slotted water nozzle and a hole mask with water streams of such low impact energy that no substantial fiber entanglement develops in the hole areas; drying the perforated sandwich; and consolidating the sandwich under pressure at a temperature above the melting point of the low-melting component, without the addition of a binding agent.
Claim 10
Independent Claim
128 words
A method for the production of a nonwoven, textile sponge for medicine and hygiene, having at least one absorbent fiber layer containing, in some cases, binding fibers, and at least one external layer containing water-repellent fibers, said water-repellent fiber layer having at least 80% synthetic heterofil filaments with a low-melting and a high-melting component, comprising: covering one of the layers with the other to form a sandwich, hydraulically perforating the sandwich by means of a slotted water nozzle and a hole mask with water streams of such low impact energy that no substantial fiber entanglement develops in the hole areas; drying the perforated sandwich; and consolidating the sandwich under pressure at a temperature above the melting point of the low-melting component, without the addition of a binding agent.
Claim 11
Dependent Claim
16 words
The method of claim 8, further comprising thermally smoothing at least one surface of the sponge.
Claim 12
Dependent Claim
25 words
The method of claim 8, wherein the least one fiber layer is provided with polyester fibers which can be shrunk in hot water or steam.
Claim 13
Dependent Claim
14 words
The method of claim 10, wherein the shrinkage is performed simultaneously with the drying.
Claim 14
Dependent Claim
18 words
The method of claim 8, wherein at least one cellulose layer is used exclusively for the absorbent layer.
Claim 15
Dependent Claim
17 words
The method of claim 12, wherein the least one cellulose layer is moistened before the hydraulic perforation.
Claim 16
Dependent Claim
18 words
The method of claim 10, wherein at least one cellulose layer is used exclusively for the absorbent layer.
Claim 17
Dependent Claim
17 words
The method of claim 14, wherein the least one cellulose layer is moistened before the hydraulic perforation.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-15 | 1991-09-14 | 1992-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-15 | 1995-09-14 | 1996-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-15 | 1999-09-14 | 2000-03-15 | $7700.00 | Window Closed / Lapsed |