Patent US3720361A successfully refreshed from Google Patents.
US3720361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and device for the preparation of a plastic fiber fleece
Assignee: Stamicarbon BV
•
Filing: 1971-03-26
•
Granted: 1973-03-13
•
Expires: 1991-03-26
Abstract
Abstract Process and apparatus for the preparation of a plastics fiber fleece, wherein filaments are moved towards a conveying plane and, prior to their lying down on the conveying plane, are zigzagged by means of air flows slanting upwards which are effected by simultaneously injecting air on one side of a free space and suctioning off air on the opposite side of the space whereby the air flows hit the filaments in the free space.
Inventors
- 👤 J Nommensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:53
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/02; D04H3/05; D04H3/005; D04H3/009
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
81 words
In a process for the preparation of a plastics fiber fleece, in which filaments are moved toward a conveying plane and, prior to their lying down on the conveying plane, are zigzagged, the improvement wherein the zigzag is effected by means causing air flow slanting upwards, hit the filaments in a free space, each such air flow being effected by simultaneously injecting air on one side of the said space and suctioning off air on the opposite side of said space.
Claim 2
Dependent Claim
81 words
In a process for the preparation of a plastics fiber fleece, in which filaments are moved toward a conveying plane and, prior to their lying down on the conveying plane, are zigzagged, the improvement wherein the zigzag is effected by means causing air flow slanting upwards, hit the filaments in a free space, each such air flow being effected by simultaneously injecting air on one side of the said space and suctioning off air on the opposite side of said space.
Claim 3
Dependent Claim
81 words
In a process for the preparation of a plastics fiber fleece, in which filaments are moved toward a conveying plane and, prior to their lying down on the conveying plane, are zigzagged, the improvement wherein the zigzag is effected by means causing air flow slanting upwards, hit the filaments in a free space, each such air flow being effected by simultaneously injecting air on one side of the said space and suctioning off air on the opposite side of said space.
Claim 4
Dependent Claim
81 words
In a process for the preparation of a plastics fiber fleece, in which filaments are moved toward a conveying plane and, prior to their lying down on the conveying plane, are zigzagged, the improvement wherein the zigzag is effected by means causing air flow slanting upwards, hit the filaments in a free space, each such air flow being effected by simultaneously injecting air on one side of the said space and suctioning off air on the opposite side of said space.
Claim 5
Dependent Claim
11 words
Process according to claim 1, wherein the suctioned-off air is injected.
Claim 6
Independent Claim
118 words
A device for the preparation of plastic fiber fleece comprising a conveying plane, means for feeding filaments towards said conveying plant, a chamber having substantially the same width as said conveying plant, and adopted for passage of said fleece from said feeding device through said chamber onto said conveying plane, said chamber being arranged between said conveying plane and said feeding device, said chamber having at least two injection apertures facing each other, and adopted for directing an air flow in a slanting upwards direction against the filaments of said fleece and with at least two suctioned-off openings, located at a higher level in said chamber, than said apertures, and means for suctioning off air from said chamber.
Claim 7
Independent Claim
118 words
A device for the preparation of plastic fiber fleece comprising a conveying plane, means for feeding filaments towards said conveying plant, a chamber having substantially the same width as said conveying plant, and adopted for passage of said fleece from said feeding device through said chamber onto said conveying plane, said chamber being arranged between said conveying plane and said feeding device, said chamber having at least two injection apertures facing each other, and adopted for directing an air flow in a slanting upwards direction against the filaments of said fleece and with at least two suctioned-off openings, located at a higher level in said chamber, than said apertures, and means for suctioning off air from said chamber.
Claim 8
Dependent Claim
29 words
The device according to claim 3, wherein each said suctioned-off opening is connected, by means of a circulation system which includes a fan, with the oppositely opposed injection aperture.
References Cited (Backward Citations)
US3597175A
Cited
US3485428A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |