US3900921A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making staple fiber webs by air-laydown
Assignee: EIDP Inc
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Filing: 1974-02-13
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Granted: 1975-08-26
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Expires: 1994-02-13
Abstract
Abstract A process is disclosed for high speed production of uniform webs by air-laydown of textile fibers. A feed batt of staple fibers is fed to a toothed disperser roll that projects the fibers at high velocity and low angle into an airstream of high uniform velocity and low turbulence to form a thin fiber stream from which the fibers are subsequently separated in the form of a web. The webs are suitable for producing high quality nonwoven fabrics by known fiberinterlocking or bonding treatments.
Inventors
- 👤 Dimitri P Zafiroglu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:31
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/70; D04H1/72
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
172 words
In a process wherein a batt of staple fibers is contacted in a transfer zone with the toothed surface of a disperser-roll revolving to disperse the fiBers in air from which the fibers are subsequently deposited on a moving screen; an improved highcapacity fiber-dispersion process for providing good fiber dispersion with low fiber breakage or nepping, wherein the improvement comprises feeding a loose fiber batt weighing from 40 to about 150 ounces per square yard into said transfer zone at a rate greater than 3 pounds per inch of disperser-roll width per hour, compressing the batt at the entrance of the transfer zone to a maximum density within the range of about 5 to 20 pounds per cubic foot, guiding the batt along a path in a substantially radial direction toward a disperserroll revolving at a surface speed of about 10,000 to about 20,000 feet per minute, and confining the batt to reach the toothed surface of the disperserroll at a density of about 2 to about 5 pounds per cubic foot.
Claim 2
Dependent Claim
172 words
In a process wherein a batt of staple fibers is contacted in a transfer zone with the toothed surface of a disperser-roll revolving to disperse the fiBers in air from which the fibers are subsequently deposited on a moving screen; an improved highcapacity fiber-dispersion process for providing good fiber dispersion with low fiber breakage or nepping, wherein the improvement comprises feeding a loose fiber batt weighing from 40 to about 150 ounces per square yard into said transfer zone at a rate greater than 3 pounds per inch of disperser-roll width per hour, compressing the batt at the entrance of the transfer zone to a maximum density within the range of about 5 to 20 pounds per cubic foot, guiding the batt along a path in a substantially radial direction toward a disperserroll revolving at a surface speed of about 10,000 to about 20,000 feet per minute, and confining the batt to reach the toothed surface of the disperserroll at a density of about 2 to about 5 pounds per cubic foot.
Claim 3
Dependent Claim
21 words
The process defined in claim 1 wherein the loose fiber batt weighs about 50 to about 90 ounces per square yard.
Claim 4
Dependent Claim
31 words
The process defined in claim 1 wherein the fiber batt is fed into the transfer zone at a rate of 6 to 20 pounds per inch of disperser-roll width per hour.
References Cited (Backward Citations)
US2157684A
Cited
US2676364A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |