US4024612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making an apertured nonwoven fabric
Assignee: EIDP Inc
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Filing: 1976-04-02
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Granted: 1977-05-24
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Expires: 1996-04-02
Abstract
Abstract The tensile strength of apertured nonwoven fabric can be increased by a change in the two-stage process of impinging fine columnar streams of liquid, first onto one face of a fibrous web and then onto the opposite face thereof, the change being that the asymmetrical woven wire screen on which the web is positioned during the second stage of the process is oriented with the wire forming the higher knuckle in the screen running in the direction of passage of the web beneath the fine columnar streams, with the area weight of the web being from 0.5 to 2.0 oz/yd 2 .
Inventors
- 👤 Rashmikant Maganlal Contractor
- 👤 Birol Kirayoglu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:48
CPC Classifications
D; D04; D04H; D04H18/00; D04H18/04; D04H1/00; D04H1/40; D04H1/44; D04H1/46; D04H1/492; D04H1/495
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
119 words
In the process of impinging fine columnar streams of liquid onto one face of a fibrous web on an apertured support passing beneath said streams and then onto the opposite face of said web on an asymmetrical woven-wire screen passing beneath said streams to produce by fiber entanglement an apertured nonwoven fabric wherein the apertures in said fabric correspond to knuckles in said screen, the improvement comprising carrying out the impingement of said fine columnar streams onto said opposite face of said web wherein the wires forming the higher knuckles in said screen run in the direction of passage of said web beneath said streams and obtaining as a result thereof an apertured nonwoven fabric of increased tensile strength.
Claim 2
Dependent Claim
119 words
In the process of impinging fine columnar streams of liquid onto one face of a fibrous web on an apertured support passing beneath said streams and then onto the opposite face of said web on an asymmetrical woven-wire screen passing beneath said streams to produce by fiber entanglement an apertured nonwoven fabric wherein the apertures in said fabric correspond to knuckles in said screen, the improvement comprising carrying out the impingement of said fine columnar streams onto said opposite face of said web wherein the wires forming the higher knuckles in said screen run in the direction of passage of said web beneath said streams and obtaining as a result thereof an apertured nonwoven fabric of increased tensile strength.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein said asymmetrical screen is from 4 to 60 mesh in at least one direction in said screen.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein said web has an area weight of from 0.5 to 2.0 oz/yd 2 .
Claim 5
Dependent Claim
20 words
The process of claim 1 wherein said web has an area weight of from 0.5 to 1.7 oz/yd 2 .
Claim 6
Dependent Claim
20 words
The process of claim 1 wherein said web has an area weight of from 0.7 to 1.3 oz/yd 2 .
References Cited (Backward Citations)
US3485706A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |