US4089086A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air lay-down process for producing uniform lightweight webs from textile fibers
Assignee: EIDP Inc
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Filing: 1975-12-01
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Granted: 1978-05-16
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Expires: 1995-12-01
Abstract
Abstract Process is disclosed which is suitable for high speed production of uniform, lightweight webs by air-laydown of textile fibers. A toothed disperser roll doffs the fibers into an air stream of high uniform velocity and low turbulence to form a thin fiber layer from which the fibers are deposited in web form on a moving screen. A curved disperser plate, shrouds a portion of the disperser roll up to the point of fiber doffing. By using a disperser plate with a rough surface, preferably one having lateral grooves, web uniformity is remarkably improved.
Inventors
- 👤 Rashmikant Maganlal Contractor
- 👤 Sang-Hak Hwang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:10
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/70; D04H1/72
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
In the process of converting a batt of staple fibers to a web by separating fibers from the batt, carrying the fibers through a curved space defined by a toothed rotating surface rotating at a surface speed of at least 10,000 ft/min and a curved smooth stationary surface spaced less than 0.125 inch from said rotating surface, projecting the fibers from the curved space as a thin fiber stream at an angle of less than 25° into a stable stream of air, separating the fibers of the thin fiber stream from the stable stream of air to form a web, the improvement comprising subjecting said fibers while in said curved space to a higher frequency high turbulence intensity than provided by said curved smooth stationary surface by having said surface have grooves to improve the uniformity of said web.
Claim 2
Dependent Claim
139 words
In the process of converting a batt of staple fibers to a web by separating fibers from the batt, carrying the fibers through a curved space defined by a toothed rotating surface rotating at a surface speed of at least 10,000 ft/min and a curved smooth stationary surface spaced less than 0.125 inch from said rotating surface, projecting the fibers from the curved space as a thin fiber stream at an angle of less than 25° into a stable stream of air, separating the fibers of the thin fiber stream from the stable stream of air to form a web, the improvement comprising subjecting said fibers while in said curved space to a higher frequency high turbulence intensity than provided by said curved smooth stationary surface by having said surface have grooves to improve the uniformity of said web.
References Cited (Backward Citations)
GB189702509A
Cited
US1705433A
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US2648876A
Cited
US3036343A
Cited
US3268954A
Cited
US3797074A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |