US3856612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-woven structures
Assignee: Celanese Corp
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Filing: 1971-08-02
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Granted: 1974-12-24
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Expires: 1991-08-02
Abstract
Abstract Non-woven fabrics and webs of uniform thickness and width are prepared from conventional webs of randomly laid continuous filaments which fabrics and webs have non-uniform edges and are of non-uniform thickness by contacting the web with a folding guide and pneumatically folding the web followed by calendering of the folded web.
Inventors
- 👤 P Mcginnis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:08
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/02; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1008; Y10T156/1011; Y10T156/1015; Y10T428/00; Y10T428/24; Y10T428/2419; Y10T428/24264
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
43 words
A BONDED NON-WOVEN FABRIC HAVING PARALLEL SIDES AND BEING OF SUBSTANTIALLY UNIFORM THICKNESS AND DENSITY ACROSS ITS WIDTH COMPRISING A RANDOMLY-LAID CONTINUOUS THERMOPLASTIC POLYMER FILAMENT WEB FOLDED AND PRESSED SUCH THAT THE RANDOMLY-LAID EDGES ARE SUBSTANTIALLY COINCIDENT WITH THE CENTER OF THE WEB.
Claim 2
Dependent Claim
43 words
A BONDED NON-WOVEN FABRIC HAVING PARALLEL SIDES AND BEING OF SUBSTANTIALLY UNIFORM THICKNESS AND DENSITY ACROSS ITS WIDTH COMPRISING A RANDOMLY-LAID CONTINUOUS THERMOPLASTIC POLYMER FILAMENT WEB FOLDED AND PRESSED SUCH THAT THE RANDOMLY-LAID EDGES ARE SUBSTANTIALLY COINCIDENT WITH THE CENTER OF THE WEB.
Claim 3
Dependent Claim
26 words
The fabric of claim 1 wherein said filaments are formed of a polymer selected from the group consisting of the polyolefins, polyamides, polyesters, and cellulose esters.
Claim 4
Dependent Claim
37 words
The fabric of claim 1 having a width of about 4.5 to about 6 inches; a thickness of from about 5 to about 15 mils; and a density of from about 1.0 to about 3.0 oz./sq. yd.
Claim 5
Dependent Claim
20 words
The fabric of claim 1, wherein said thickness and density have a coefficient of variation of less than 5 percent.
Claim 6
Dependent Claim
90 words
A BONDED NON-WOVEN FABRIC COMPRISING A RANDOM ARRAY OF CONTINUOUS THERMOPLASTIC FILAMENTARY MATERIAL COMPOSED OF AT LEAST ONE ORGANIC SYNTHETIC POLYMER, SAID BONDED NONWOVEN FABRIC FORMING A SINGLE PLANAR STRUCTURE COMPOSED OF AT LEAST TWO LAYERS OF SAID MATERIAL CALENDERED TOGETHER SUCH AS TO RESIST DELAMINATION, SAID LAYERS BEING INTEGRALLY CONNECTED AT THE OUTERMOST EDGES THEREFORE, THE CALANDERED MATERIAL COMPRISING SAID PORTIONS FOLDED OVER UPON ITSELF AND EXTENDING ACROSS AT LEAST HALF OF SAID FOLDED FABRIC SUCH THAT THE EDGES ARE SUBSTANTIALLY COINCEDENT WITH THE CENTER OF THE FOLDED FABRIC.
Claim 7
Dependent Claim
90 words
A BONDED NON-WOVEN FABRIC COMPRISING A RANDOM ARRAY OF CONTINUOUS THERMOPLASTIC FILAMENTARY MATERIAL COMPOSED OF AT LEAST ONE ORGANIC SYNTHETIC POLYMER, SAID BONDED NONWOVEN FABRIC FORMING A SINGLE PLANAR STRUCTURE COMPOSED OF AT LEAST TWO LAYERS OF SAID MATERIAL CALENDERED TOGETHER SUCH AS TO RESIST DELAMINATION, SAID LAYERS BEING INTEGRALLY CONNECTED AT THE OUTERMOST EDGES THEREFORE, THE CALANDERED MATERIAL COMPRISING SAID PORTIONS FOLDED OVER UPON ITSELF AND EXTENDING ACROSS AT LEAST HALF OF SAID FOLDED FABRIC SUCH THAT THE EDGES ARE SUBSTANTIALLY COINCEDENT WITH THE CENTER OF THE FOLDED FABRIC.
Claim 8
Dependent Claim
33 words
The bonded non-woven fabric of claim 5 wherein said structure comprises three layers, wherein the outermost layers extend in opposite directions to the center of the base layer, as in a compressed S.
Claim 9
Dependent Claim
20 words
The bonded non-woven fabric of claim 5 wherein the said planar structure has opposite faces composed of different polymeric material.
Claim 10
Dependent Claim
23 words
The ribbon of claim 7 wherein one face is composed of a synthetic linear polyester, and the opposite face is composed of polypropylene.
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |