US3684415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Melt blown roving die
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1970-12-16
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Granted: 1972-08-15
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Expires: 1990-12-16
Abstract
Abstract A roving of entangled and self-bonded fine fibers of thermoplastic resins may be formed by a melt blown roving technique which comprises extruding the thermoplastic resin through a die having the die openings in a circle into a hot gas stream to attenuate the extruded polymer into fibers in the form of a cone of fibers in space and collecting the fibers as a tow. The process yields many unique products which vary in characteristics depending on the specific collection of the fibers.
Inventors
- 👤 Robert R Buntin
- 👤 John W Harding
- 👤 James P Keller
- 👤 Vollie L Murdock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:02
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/02; A24D3/0229; A24D3/0237; B; B29; B29C; B29C48/00; B29C48/03; B29C48/05; B29C48/25; B29C48/30; B29C48/345; D; D01; D01D; D01D4/00; D01D4/02; D01D4/025; D01D5/00; D01D5/08; D01D5/098; D01D5/0985; Y; Y10; Y10S; Y10S264/00; Y10S264/75
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
169 words
A die for the melt-blowing of fiber-forming thermoplastics which comprises in combination: a. a generally toroidal-shaped support means with a large generally unobstructed center opening therein so constructed and adapted to receive a collecting means and having a system of inlet means and passageway means for said thermoplastic and means for supplying thermoplastic thereto and a system of inlet means and passageway means for a gaseous blowing agent and means for supplying the blowing agent thereto; b. a plurality of die orifices arranged in a general circular configuration on one side of said toroidal support means generally surrounding said toroidal opening and connected with said thermoplastic passageway means; c. first gas stream directing means concentric within said circle and connected with said gaseous blowing agent passageway means; d. second gas stream directing means concentric without said circle and connected with said gaseous blowing agent passageway means; said gas stream directing means being so adjusted and arranged as to attenuate said thermoplastic into fibers as it emerges from said orifices.
Claim 2
Dependent Claim
169 words
A die for the melt-blowing of fiber-forming thermoplastics which comprises in combination: a. a generally toroidal-shaped support means with a large generally unobstructed center opening therein so constructed and adapted to receive a collecting means and having a system of inlet means and passageway means for said thermoplastic and means for supplying thermoplastic thereto and a system of inlet means and passageway means for a gaseous blowing agent and means for supplying the blowing agent thereto; b. a plurality of die orifices arranged in a general circular configuration on one side of said toroidal support means generally surrounding said toroidal opening and connected with said thermoplastic passageway means; c. first gas stream directing means concentric within said circle and connected with said gaseous blowing agent passageway means; d. second gas stream directing means concentric without said circle and connected with said gaseous blowing agent passageway means; said gas stream directing means being so adjusted and arranged as to attenuate said thermoplastic into fibers as it emerges from said orifices.
Claim 3
Dependent Claim
26 words
A die according to claim 1 wherein said toroidal support means compresses an inner ring member and an outer ring member which meet in a facing.
Claim 4
Dependent Claim
25 words
A die according to claim 2 wherein said inner ring member has a plurality of grooves milled in said facing to form the die openings.
Claim 5
Dependent Claim
25 words
A die according to claim 2 wherein said outer ring member has a plurality of grooves milled in said facing to form the die openings.
Claim 6
Dependent Claim
34 words
A die according to claim 1, which is further characterized by having a double-walled pipe extending through its center opening, so adjusted and arranged so as to permit gas flow between the two walls.
Claim 7
Dependent Claim
49 words
An apparatus for forming a roving from fiber-forming thermoplastics which comprises in combination: a. the die of claim 1; b. a rod-shaped collecting means for said roving extending in a longitudinal direction through said center opening of said toroidal-shaped support means; c. drive means for rotating said collecting means.
Claim 8
Dependent Claim
16 words
An apparatus according to claim 6 which is farther characterized by having a roving take-up means.
Claim 9
Dependent Claim
21 words
An apparatus according to claim 6 which is further characterized by a starter sleeve means surrounding and encompassing said collecting means.
References Cited (Backward Citations)
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US2511381A
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US2991507A
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US3017664A
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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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |