US3923291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal mixer
Assignee: STEWART BOLLING COMPANY
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Filing: 1974-09-12
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Granted: 1975-12-02
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Expires: 1994-09-12
Abstract
Abstract An internal continuous mixer with parallel mixing rotors and a screw controlled discharge. Each rotor comprises a central bladed mixing portion, a screw infeed portion and a screw outfeed portion. The threads of the screw outfeed portion have nonuniform crest diameter thus working the material being mixed, and providing clearance permitting the material discharge rate to be controlled down stream therefrom as by an enclosed material conveyor or feed screw, preferably a screw extruder apparatus.
Inventors
- 👤 James T Matsuoka
- 👤 Armindo Cantarutti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:45
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/375; B29C48/38; B29B; B29B7/00; B29B7/30; B29B7/34; B29B7/38; B29B7/46; B29B7/48; B29B7/482; B29B7/488; B29B7/489; B29B7/58; B29B7/582; B29B7/74; B29B7/7476; B29B7/7495; B29B7/80; B29B7/82; B29B7/823; B29B7/826; B29C48/03
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
192 words
In a continuous internal mixer for processing plastics, and the like: a housing having two side-by-side interconnected substantially cylindrical material processing chambers having a first opening adjacent to one end through which material to be processed is charged and a second opening adjacent to the opposite end through which material is discharged; two rotors, one in each of said chambers, supported for rotation therein and each provided with material working blade portions in the mixing chamber oriented more lengthwise of the axis of the rotors than circumferentially thereof and twisting in opposite directions; an interrupted screw thread having a maximum diameter about equal to the interior diameter of said mixing chamber and lacking a full diameter thread convolution on each of said rotors at the downstream side of said material working blades; means for rotating said rotors; a cylindrical conduit offset from and extending transversely of the axes of said rotors communicating with said second opening; a rotatable screw in said conduit to convey material from said chambers; and means for rotating said screw at a controlled rate whereby the duration of the processing of material in said processing chambers is controlled.
Claim 2
Dependent Claim
192 words
In a continuous internal mixer for processing plastics, and the like: a housing having two side-by-side interconnected substantially cylindrical material processing chambers having a first opening adjacent to one end through which material to be processed is charged and a second opening adjacent to the opposite end through which material is discharged; two rotors, one in each of said chambers, supported for rotation therein and each provided with material working blade portions in the mixing chamber oriented more lengthwise of the axis of the rotors than circumferentially thereof and twisting in opposite directions; an interrupted screw thread having a maximum diameter about equal to the interior diameter of said mixing chamber and lacking a full diameter thread convolution on each of said rotors at the downstream side of said material working blades; means for rotating said rotors; a cylindrical conduit offset from and extending transversely of the axes of said rotors communicating with said second opening; a rotatable screw in said conduit to convey material from said chambers; and means for rotating said screw at a controlled rate whereby the duration of the processing of material in said processing chambers is controlled.
Claim 3
Dependent Claim
201 words
In a continuous internal mixer for processing plastics and the like: a frame having two side-by-side interconnected substantially cylindrical material processing chambers having a first opening adjacent to one end through which material to be processed is charged and a second opening adjacent to its opposite end through which material is discharged; two rotors, one in each of said chambers, supported for rotation therein and each provided with pairs of material working blade portions in the central part of the mixing chamber oriented more lengthwise of the axis of the rotors than circumferentially thereof and twisting in opposite directions; A screw thread on each of said rotors at the downstream side of said material working blades of varying crest height having a maximum diameter about equal to the interior diameter of said mixing chamber and lacking a full diameter thread convolution; means for rotating said rotors; a cylindrical conduit offset from and extending transversely of the axes of said rotors communicating with said second opening; a rotatable screw in said conduit for conveying material from said chambers; and means for rotating said screw at a controlled rate whereby the duration of the processing of material in said processing chambers is controlled.
Claim 4
Dependent Claim
201 words
In a continuous internal mixer for processing plastics and the like: a frame having two side-by-side interconnected substantially cylindrical material processing chambers having a first opening adjacent to one end through which material to be processed is charged and a second opening adjacent to its opposite end through which material is discharged; two rotors, one in each of said chambers, supported for rotation therein and each provided with pairs of material working blade portions in the central part of the mixing chamber oriented more lengthwise of the axis of the rotors than circumferentially thereof and twisting in opposite directions; A screw thread on each of said rotors at the downstream side of said material working blades of varying crest height having a maximum diameter about equal to the interior diameter of said mixing chamber and lacking a full diameter thread convolution; means for rotating said rotors; a cylindrical conduit offset from and extending transversely of the axes of said rotors communicating with said second opening; a rotatable screw in said conduit for conveying material from said chambers; and means for rotating said screw at a controlled rate whereby the duration of the processing of material in said processing chambers is controlled.
Claim 5
Dependent Claim
197 words
In a continuous internal mixer for processing plastics, and the like: a housing having two side-by-side interconnected substantially cylindrical material processing chambers having a first opening adjacent to one end through which material to be processed in charged and a second opening adjacent to the opposite end through which material is discharged; two rotors, one in each of said chambers, supported for rotation therein and each provided with material working blade portions in the mixing chamber oriented more lengthwise of the axis of the rotors than circumferentially thereof and twisting in opposite directions; an interrupted screw thread devoid of a full diameter convolution on each of said rotors at the downstream side of said material working blades; means for rotating said rotors, a cylindrical conduit offset from and extending transversely of the axes of said rotors connected to said second opening for receiving material from said processing chamber, a rotatable screw extending axially in said conduit closely received therein and extending substantially the length thereof; and means to rotate said screw at a controllEd rate to convey material away from said second opening whereby the duration of the processing of material in said processing chambers is controlled.
Claim 6
Dependent Claim
197 words
In a continuous internal mixer for processing plastics, and the like: a housing having two side-by-side interconnected substantially cylindrical material processing chambers having a first opening adjacent to one end through which material to be processed in charged and a second opening adjacent to the opposite end through which material is discharged; two rotors, one in each of said chambers, supported for rotation therein and each provided with material working blade portions in the mixing chamber oriented more lengthwise of the axis of the rotors than circumferentially thereof and twisting in opposite directions; an interrupted screw thread devoid of a full diameter convolution on each of said rotors at the downstream side of said material working blades; means for rotating said rotors, a cylindrical conduit offset from and extending transversely of the axes of said rotors connected to said second opening for receiving material from said processing chamber, a rotatable screw extending axially in said conduit closely received therein and extending substantially the length thereof; and means to rotate said screw at a controllEd rate to convey material away from said second opening whereby the duration of the processing of material in said processing chambers is controlled.
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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |