Patent US4089086A successfully refreshed from Google Patents.
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 16:18
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)
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Cited
US1705433A
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US2648876A
Cited
US3036343A
Cited
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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 |