US3583684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixing and reaction extruder
Assignee: Oerlikon Barmag AG
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Filing: 1969-05-16
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Granted: 1971-06-08
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Expires: 1989-05-16
Abstract
Abstract Screw presses for the continuous execution of mixing, homogenizing and reaction processes for flowable, and especially for viscous, materials or mixtures of materials, characterized by at least one screw with a conveying and an adjoining mixing zone in an essentially cylindrical screw passage wherein a helical dividing wall provided with holes, slits or similar perforations is arranged between the webs or flights of a screw or in the hollow end of a screw shaft, the radial distance of said dividing wall from the adjacent portion of the screw core on the one hand and from the internal wall of the cylindrical screw passage on the other hand being variable in the longitudinal direction of the screw or web spiral, and which divides the screw thread into an internal and an external passage of varying depth or cross section in said longitudinal direction.
Inventors
- 👤 Heinz Schippers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:26
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/505; B29C48/67; B29C48/62; B29C48/03
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
97 words
A screw press as claimed in claim 1, means separably mounting in the area of said mixing zone the screw core and its helical screw flight, means attaching said helical dividing wall in said mixing zone to said separable screw flight, and means detachably connecting at least one of said screw core and the screw flight in said mixing zone with the corresponding screw part in said conveying zone, whereby at least one of said screw core and said screw flight in said mixing zone may be separated to facilitate cleaning these parts in said mixing zone.
Claim 2
Dependent Claim
32 words
A screw press as claimed in claim 2, and means for rotatably supporting said separable screw flight in said mixing zone for rotation independently of said screw core in said mixing zone.
Claim 3
Dependent Claim
38 words
A screw press as claimed in claim 3 wherein said separable screw flight is rotatably supported by a shaft on the downstream, output end of said screw passage, and drive means for rotatably driving said separable screw flight.
Claim 4
Dependent Claim
26 words
A screw press as claimed in claim 1 wherein said helical dividing wall is cylindrical in transverse cross section and eccentric relative to said screw core.
Claim 5
Dependent Claim
22 words
A screw press as claimed in claim 1 wherein said helical dividing wall is substantially oval or elliptical in transverse cross section.
Claim 6
Dependent Claim
65 words
A screw press as claimed in claim 1 wherein said screw and its helical flights extend axially through said conveying zone and said mixing zone and wherein said helical dividing wall is supported by a hollow, helical screw thread surrounding said first-mentioned screw in said mixing zone, and means for rotatably driving said hollow screw thread and helical dividing wall independently of said first-mentioned screw.
Claim 7
Dependent Claim
88 words
A screw press as claimed in claim 1 wherein the diameter of said screw passage in said mixing zone is larger than the diameter of said screw passage in said conveying zone, a hollow, conically flaring wall in said mixing zone connected to and driven by said screw core, helical screw flights on said conically flaring wall and passages in said wall between said screw flights, and a second screw driven independently of said first-mentioned screw extending substantially coaxially into the hollow portion of said conically flaring wall.
Claim 8
Dependent Claim
47 words
A screw press as claimed in claim 8 wherein said second screw is driven by means on the downstream, output end of said mixing zone, said second screw having helical flights of opposite hand to the helical flights in said first-mentioned screw and said conically flaring wall.
Claim 9
Dependent Claim
52 words
A screw press as claimed in claim 1 wherein the screw core of the mixing zone is separated not only from the screw core of the conveying zone but also from the screw flight in the mixing zone and is supported independently rotatably and drivable at the output side of the press.
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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |