US3793679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic drafting of fibrous strands
Assignee: Fiber Technology Corp
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Filing: 1971-07-02
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Granted: 1974-02-26
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Expires: 1991-07-02
Abstract
Abstract A twist-free strand of textile length fibers is pneumatically drafted at its leading end into a high velocity fibrous stream which may be decelerated and diffused in a plenum chamber from which it is removed as a fibrous web.
Inventors
- 👤 P Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:08
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/70; D04H1/72
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
118 words
The method of forming a high-velocity low-population fluid stream of discretely separated textile-length fibers which comprises feeding a twist-free strand composed of substantially parallel overlapping textile-length fibers through a guide tube open at both ends, said strand being between 30,000 and 500,000 denier; maintaining said strand substantially constant in crosssectional poulation through a substantial portion of the length of said guide tube; subjecting the free end of said strand to the action of a fluid stream in the form of a concentric fluid flow having a high velocity; drafting and attenuating said strand into a high-velocity lowpopulation fluid stream of discretely separated textile-length fibers in said tube; and expelling said strand with said fluid stream from said tube.
Claim 2
Independent Claim
118 words
The method of forming a high-velocity low-population fluid stream of discretely separated textile-length fibers which comprises feeding a twist-free strand composed of substantially parallel overlapping textile-length fibers through a guide tube open at both ends, said strand being between 30,000 and 500,000 denier; maintaining said strand substantially constant in crosssectional poulation through a substantial portion of the length of said guide tube; subjecting the free end of said strand to the action of a fluid stream in the form of a concentric fluid flow having a high velocity; drafting and attenuating said strand into a high-velocity lowpopulation fluid stream of discretely separated textile-length fibers in said tube; and expelling said strand with said fluid stream from said tube.
Claim 3
Dependent Claim
18 words
The method according to claim 1 in which the twist-free strand is a strand of viscose rayon fibers.
Claim 4
Dependent Claim
54 words
The method according to claim 1 in which the cross-section fiber population of the strand is held substantially constant by feeding the strand between a pair of feed rolls situated at a distance from the exit end of said guide tube which is greater than the average length of the fibers in said strand.
Claim 5
Dependent Claim
62 words
The method of forming a fibrous web of staple textile-length fibers which comprises forming a high-velocity fluid stream of discretely separated fibers according to the method of claim 1, decelerating and diffusing said fibrous stream by expansion of said stream into a plenum chamber, and collecting the fibers from said stream from said plenum chamber in the form of a fibrous web.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |