US4178104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for mixing viscous materials
Assignee: Uniroyal AG
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Filing: 1978-01-30
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Granted: 1979-12-11
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Expires: 1998-01-30
Abstract
Abstract A single-screw extruder and process for mixing viscous materials, for example, rubber mixtures and thermoplastic materials. The process and apparatus includes inserting a plurality of obstacles in the flow path of the material stream in the interior of the extruder cylinder. The obstacles are in the form of a number of series of studs protruding into the cylinder and accommodated by respective gaps or openings in the threads of the screw. The depth of penetration as well as the number of studs can be varied and adjusted by automatic means. The penetrating portion of the studs can be of different shapes according to the requirements for a thorough and turbulent deflection and mixing of the material stream.
Inventors
- 👤 Hans G. L. Menges
- 👤 Engelbert G. Harms
- 👤 Rainer Hegele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:50
CPC Classifications
B; B30; B30B; B30B11/00; B30B11/22; B30B11/24; B30B11/248; B29; B29B; B29B7/00; B29B7/30; B29B7/34; B29B7/38; B29B7/40; B29B7/42; B29B7/421; B29B7/422; B29B7/58; B29B7/72; B29B7/726; B29B7/728; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/395; B29C48/50; B29C48/68; B29C48/685; B29C48/687; B29B7/74; B29B7/7476; B29B7/7495; B29B7/80; B29B7/88; B29B7/90; B29C48/03
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
243 words
A single screw extruder for mixing and homogenizing viscous materials comprising a screw conveyor for rotation inside a housing, said screw conveyor being an integral member having at least one substantially continuous thread flight of a constant pitch extending helically in the same direction along the longitudinal length of the conveyor for providing a substantially continuous forward feed path of stock material throught the extruder, said flight providing in the feed path direction a first zone for stock material input subsequently followed by a second zone for stock material mixing and homogenizing; the thread in the first zone having uninterrupted lands and the thread in the second zone having spaces between adjacent lands of the screw thread and interrupting gaps in the lands of the screw thread, obstacle means projecting into at least one of said spaces and gaps for penetrating the stock material as the screw conveyor is substantially limited to rotational movement during the forward feed to create vortexing in the material; there being at least one full revolution of the screw thread between axially adjacent obstacle means, and means for adjusting said obstacle means to achieve desired depths of projection thereof relative to the respective gaps and spaces to accommodate different material to be mixed or different mixing conditions and creating local vortexing in the material during the forward feed thereof, each vortex location and degree of vortexing thereat being determined by the adjusted depth of the respective obstacle means.
Claim 2
Dependent Claim
243 words
A single screw extruder for mixing and homogenizing viscous materials comprising a screw conveyor for rotation inside a housing, said screw conveyor being an integral member having at least one substantially continuous thread flight of a constant pitch extending helically in the same direction along the longitudinal length of the conveyor for providing a substantially continuous forward feed path of stock material throught the extruder, said flight providing in the feed path direction a first zone for stock material input subsequently followed by a second zone for stock material mixing and homogenizing; the thread in the first zone having uninterrupted lands and the thread in the second zone having spaces between adjacent lands of the screw thread and interrupting gaps in the lands of the screw thread, obstacle means projecting into at least one of said spaces and gaps for penetrating the stock material as the screw conveyor is substantially limited to rotational movement during the forward feed to create vortexing in the material; there being at least one full revolution of the screw thread between axially adjacent obstacle means, and means for adjusting said obstacle means to achieve desired depths of projection thereof relative to the respective gaps and spaces to accommodate different material to be mixed or different mixing conditions and creating local vortexing in the material during the forward feed thereof, each vortex location and degree of vortexing thereat being determined by the adjusted depth of the respective obstacle means.
Claim 3
Dependent Claim
16 words
An extruder according to claim 1 wherein the obstacle means is arranged longitudinally along the housing.
Claim 4
Dependent Claim
16 words
An extruder according to claim 1 wherein the obstacle means is arranged circumferentially about the housing.
Claim 5
Dependent Claim
23 words
An extruder according to claim 1 wherein the obstacle means comprises a plurality of pins arranged longitudinally along and circumferentially about the housing.
Claim 6
Dependent Claim
20 words
An extruder according to claim 4 wherein the pins are longitudinally drilled so as to allow access to the space.
Claim 7
Dependent Claim
17 words
An extruder according to claim 1 wherein the obstacle means is formed of a heat conductive material.
Claim 8
Dependent Claim
24 words
An extruder according to claim 1 wherein the means for controlling the depth of projection is threads on the obstacles which engage the housing.
Claim 9
Dependent Claim
23 words
An extruder according to claim 1 wherein the means for controlling the depth of projection is a cam control engaging said obstacle means.
Claim 10
Dependent Claim
40 words
An extruder according to claim 8 wherein the cam control comprises a fixture for supporting said obstacle means, said fixture having a cam follower; a gear having a cam track engaging said cam follower; and means for drawing said gear.
Claim 11
Dependent Claim
14 words
An extruder according to claim 9 wherein the cam track is a spiral groove.
Claim 12
Dependent Claim
23 words
An extruder according to claim 10 wherein the cam track has a stop for limiting the depth of projection of the obstacle means.
Claim 13
Dependent Claim
19 words
An extruder according to claim 1 wherein the obstacle means has a stop for limiting the depth of projection.
Claim 14
Dependent Claim
14 words
An extruder according to claim 1 wherein there are at least four obstacle means.
Claim 15
Dependent Claim
15 words
An extruder according to claim 1 wherein the screw conveyor has substantially a uniform cross-section.
Claim 16
Dependent Claim
30 words
An extruder according to claim 1 wherein the obstacle means comprise a plurality of projections lying in substantially the same radial plane to the axial extent of the screw conveyor.
Claim 17
Dependent Claim
33 words
An extruder according to claim 15 wherein there are a plurality of radial planes having obstacle means, the radial planes being spaced from each other along the axial extent of the screw conveyor.
Claim 18
Dependent Claim
17 words
An extruder according to claim 16 wherein there are at least three radial planes having obstacle means.
Claim 19
Dependent Claim
22 words
An extruder according to claim 15 or claim 16 or claim 17 wherein the obstacle means are spaced circumferentially about the housing.
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) | 1982-12-10 | 1983-06-11 | 1983-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-10 | 1987-06-11 | 1987-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-10 | 1991-06-11 | 1991-12-11 | $7700.00 | Window Closed / Lapsed |