US4537733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonwoven fiber-sheet process
Assignee: EIDP Inc
•
Filing: 1983-10-31
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Granted: 1985-08-27
•
Expires: 2003-10-31
Abstract
Abstract A process is provided for reducing the size and number of undesirable gauge bands in wound-up rolls of wide nonwoven sheet that is produced by a plurality of oscillating fiber streams depositing fiber on a moving receiver. The desired effect is accomplished by varying the oscillation frequency of the fiber streams by more than ±5% of the average oscillation frequency.
Inventors
- 👤 John Farago
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:03
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/02; D04H3/03
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
118 words
In a process for making a wide nonwoven fiber sheet wherein a fiber stream issues from each of a plurality of positions located above a moving receiver and along a line that makes an angle with the direction of receiver movement, each fiber stream being oscillated as it is forwarded to the receiver whereon it deposits fiber to form a ribbon which is lapped with ribbons from preceding and succeeding positions along the line, the improvement comprising varying the oscillation frequency of every other fiber stream along the line by more than ±5%, but less than ±50%, of the average oscillation frequency, the variation in oscillation frequency having a period in the range of 1 to 120 seconds.
Claim 2
Dependent Claim
118 words
In a process for making a wide nonwoven fiber sheet wherein a fiber stream issues from each of a plurality of positions located above a moving receiver and along a line that makes an angle with the direction of receiver movement, each fiber stream being oscillated as it is forwarded to the receiver whereon it deposits fiber to form a ribbon which is lapped with ribbons from preceding and succeeding positions along the line, the improvement comprising varying the oscillation frequency of every other fiber stream along the line by more than ±5%, but less than ±50%, of the average oscillation frequency, the variation in oscillation frequency having a period in the range of 1 to 120 seconds.
Claim 3
Dependent Claim
31 words
A process of claim 1 wherein the variation in oscillation frequency is in the range of ±10 to ±20% and the period is in the range of 10 to 60 seconds.
Claim 4
Dependent Claim
35 words
A process of claim 1 wherein each fiber stream comprises a plexifilamentary strand of polyethylene polymer and is oscillated by a rotating lobed baffle at an average frequency of 25 to 150 cycles per second.
Claim 5
Dependent Claim
40 words
A process of claim 1, 2 or 3 wherein the variation in oscillation frequency is imposed on all fiber streams and the variation for successive fiber streams in the line are about 180 degrees out of phase with each other.
References Cited (Backward Citations)
US2736676A
Cited
US3169899A
Cited
US3081519A
Cited
US3280229A
Cited
US3689608A
Cited
US3319309A
Cited
US3387326A
Cited
US3402227A
Cited
US3433857A
Cited
US3490115A
Cited
US3497918A
Cited
US3546898A
Cited
US3565979A
Cited
US3578739A
Cited
US3593074A
Cited
US3860369A
Cited
US4148595A
Cited
US4223101A
Cited
FR2468678A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-26 | 1989-02-25 | 1989-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-26 | 1993-02-25 | 1993-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-26 | 1997-02-25 | 1997-08-27 | $7700.00 | Window Closed / Lapsed |