Patent US2089079A successfully refreshed from Google Patents.
Patent US3756574A successfully refreshed from Google Patents.
US3756574A
Expired / Lapsed
US
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Thermoplastic material mixing
Assignee: Union Carbide Corp
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Filing: 1971-06-17
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Granted: 1973-09-04
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Expires: 1991-06-17
Abstract
Abstract Apparatus is disclosed for; heating thermoplastic material to a flowable condition; longitudinally advancing the heated material under pressure toward the discharge end of the apparatus with a rotating extrusion screw having a mixer head at the downstream end thereof; passing the partially fluxed and mixed melt into the interior of the mixer head; passing a plurality of individual streams of said partially fluxed and mixed melt through high shear zones between said mixer head and the barrel of said extrusion apparatus; and passing said plurality of streams through swirling mixing zones in a plurality of substantially longitudinal passages to a region of merger of said streams.
Inventors
- 👤 B Maddock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:46
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/505; B29C48/51; B29C48/03
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
175 words
In an extruder having a hollow barrel, screw means mounted in said barrel to advance materiAl through said barrel, and mixer head means longitudinally mounted in said barrel near the terminal end of said screw means and in close clearance therewith to shearingly engage material between said mixer head means and said barrel, the improvement which comprises: a. hollow internal passage means positioned axially within said mixer head means over a substantial portion of its terminal length and closed at the downstream end thereof; b. radial inlet port means at the upstream end of sai mixer head means for the passage of material to said internal passage of said mixer head means; c. a plurality of groove means arranged to extend substantially longitudinally in the surface of said mixer head means, said groove means closed at the upstream ends and open at the downstream ends; and d. a plurality of radial outlet conduits positioned between said plurality of groove means and communicating between said internal passage means and the exterior of said mixer head means.
Claim 2
Dependent Claim
175 words
In an extruder having a hollow barrel, screw means mounted in said barrel to advance materiAl through said barrel, and mixer head means longitudinally mounted in said barrel near the terminal end of said screw means and in close clearance therewith to shearingly engage material between said mixer head means and said barrel, the improvement which comprises: a. hollow internal passage means positioned axially within said mixer head means over a substantial portion of its terminal length and closed at the downstream end thereof; b. radial inlet port means at the upstream end of sai mixer head means for the passage of material to said internal passage of said mixer head means; c. a plurality of groove means arranged to extend substantially longitudinally in the surface of said mixer head means, said groove means closed at the upstream ends and open at the downstream ends; and d. a plurality of radial outlet conduits positioned between said plurality of groove means and communicating between said internal passage means and the exterior of said mixer head means.
Claim 3
Dependent Claim
24 words
Apparatus in accordance with claim 1, wherein said outlet conduits are positioned between a pair of lands, in turn, positioned between said groove means.
Claim 4
Dependent Claim
67 words
Apparatus in accordance with claim 2 wherein each pair of lands comprises a cleaning land of full diameter and a shearing land of reduced diameter to form a shearing zone in cooperation with said barrel, said cleaning land and said shearing land being positioned, respectively, on the leading and trailing sides of said outlet conduits with respect to the direction of rotation of said mixer head means.
Claim 5
Dependent Claim
22 words
Apparatus in accordance with claim 2, wherein said outlet conduits comprise longitudinal slots running substantially the entire length of said groove means.
Claim 6
Dependent Claim
67 words
Apparatus in accordance with claim 4, wherein each pair of lands comprises a cleaning land of full diameter and a shearing land of reduced diameter to form a shearing zone in cooperation with said barrel, said cleaning land and said shearing land being positioned, respectively, on the leading and trailing sides of said outlet conduits with respect to the direction of rotation of said mixer head means.
References Cited (Backward Citations)
US3319299A
Cited
US3486192A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |