Patent US3884451A successfully refreshed from Google Patents.
US3884451A
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US
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Mixing apparatus and method
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1973-01-17
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Granted: 1975-05-20
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Expires: 1993-01-17
Abstract
Abstract A single screw extruder, comprising a rotatable core means in an extruder barrel, is provided with spaced-apart discontinuous helical flights arranged on the rotatable core means with each flight centered in the channel formed by the preceding flights, the flights being formed by lands on the core means, and each land having a traversed axial length of about one diameter unit of the core means. The extruder is particularly useful in filler compounding of solid polyolefins, the blending of different polyolefins, and the reacting of monomers with polyolefins such as in extruder grafting.
Inventors
- 👤 Donald G Stenmark
- 👤 Raymond L Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:27
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/505; B29C48/03
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
86 words
A rotatable core means adapted and constructed to be utilized in an extruder barrel means comprising in combination: a. an extruder screw means having a succession of individual spaced apart, offset, discontinuous, helical flights disposed on said screw means to form channels between said flights; b. each successive flight being centered in a channel of preceding flights; c. said flights having the narrowest-width-channel within the range from about -0.25 to about three diameters of said core means, the diameter of said core means including said flights.
Claim 2
Dependent Claim
86 words
A rotatable core means adapted and constructed to be utilized in an extruder barrel means comprising in combination: a. an extruder screw means having a succession of individual spaced apart, offset, discontinuous, helical flights disposed on said screw means to form channels between said flights; b. each successive flight being centered in a channel of preceding flights; c. said flights having the narrowest-width-channel within the range from about -0.25 to about three diameters of said core means, the diameter of said core means including said flights.
Claim 3
Dependent Claim
25 words
the flights are formed by flights having a total axial length within the range from about 1/10 to about five diameters of the core means;
Claim 4
Dependent Claim
25 words
the flights are formed by flights having a total axial length within the range from about 1/10 to about five diameters of the core means;
Claim 5
Dependent Claim
111 words
at least one flight having leading and trailing ends and extending helically around said core from said trailing end to said leading end of said core, said one flight having advancing and following walls along its length, said one flight defining a helical channel above said core between its advancing and following walls, said trailing end of said one flight of said second element being transversely displaced on said core from the leading edges of said one flight of the first element so that the trailing end of said one flight of the second element is centrally disposed in the projected helical planes of said channel extending from said first element.
Claim 6
Dependent Claim
111 words
at least one flight having leading and trailing ends and extending helically around said core from said trailing end to said leading end of said core, said one flight having advancing and following walls along its length, said one flight defining a helical channel above said core between its advancing and following walls, said trailing end of said one flight of said second element being transversely displaced on said core from the leading edges of said one flight of the first element so that the trailing end of said one flight of the second element is centrally disposed in the projected helical planes of said channel extending from said first element.
Claim 7
Dependent Claim
18 words
A core means in accordance with claim 1 which is formed by at least two interconnected abutting sections.
Claim 8
Dependent Claim
95 words
at least two flights having leading and trailing ends and extending helically in the same direction around said core from said trailing end to said leading end of said core, said trailing ends of the flights of said second element being transversely displaced in the same direction on said core from the leading ends of the flights of the first element so that the trailing end of each flight of the second element is centered between projected helical planes extending from leading ends of the flights of the first element in order to stream split.
Claim 9
Dependent Claim
95 words
at least two flights having leading and trailing ends and extending helically in the same direction around said core from said trailing end to said leading end of said core, said trailing ends of the flights of said second element being transversely displaced in the same direction on said core from the leading ends of the flights of the first element so that the trailing end of each flight of the second element is centered between projected helical planes extending from leading ends of the flights of the first element in order to stream split.
Claim 10
Dependent Claim
25 words
the flights are formed by flights each having an axial length within the range from about 1/10 to about five diameters of the core means;
Claim 11
Dependent Claim
25 words
the flights are formed by flights each having an axial length within the range from about 1/10 to about five diameters of the core means;
Claim 12
Dependent Claim
21 words
the perpendicular width of the narrowest-width-channel is within the range from about 1/20 to about two diameters of the core means.
Claim 13
Dependent Claim
21 words
the perpendicular width of the narrowest-width-channel is within the range from about 1/20 to about two diameters of the core means.
Claim 14
Dependent Claim
44 words
A core means in accordance with claim 1 in which the lands on the core means have a total axial length within the range of about 1/10 to about five diameters of the core means, the diameter of the core means including the flights.
Claim 15
Dependent Claim
20 words
the width of the narrowest-width-channel is within the range from about 1/20 to about two diameters of the core means.
Claim 16
Dependent Claim
20 words
the width of the narrowest-width-channel is within the range from about 1/20 to about two diameters of the core means.
Claim 17
Dependent Claim
40 words
A core means in accordance with claim 1 in which the perpendicular width of the narrowest-width-channel is within the range from about 1/20 to about two diameters of the core means, the diameter of the core means including the flights.
Claim 18
Dependent Claim
10 words
A core means in accordance with claim 1 in which:
Claim 19
Dependent Claim
105 words
An extRuder which comprises: barrel means; core means arranged longitudinally in said barrel means; at least one of said barrel means and core means being rotatable; and a succession of at least two spaced apart discontinuous helical flight means arranged on said core means to form channels between each flight means; one flight means being centered in the channel of the preceding flight means; said flight means being formed by lands having a running length of the narrowest-width-channel between said lands within the range from about -0.25 to about three diameters of the core means, the diameter of the core means including the flight means.
Claim 20
Dependent Claim
105 words
An extRuder which comprises: barrel means; core means arranged longitudinally in said barrel means; at least one of said barrel means and core means being rotatable; and a succession of at least two spaced apart discontinuous helical flight means arranged on said core means to form channels between each flight means; one flight means being centered in the channel of the preceding flight means; said flight means being formed by lands having a running length of the narrowest-width-channel between said lands within the range from about -0.25 to about three diameters of the core means, the diameter of the core means including the flight means.
Claim 21
Dependent Claim
21 words
An extruder in accordance with claim 6 in which the core means is formed by at least two interconnected abutting sections.
Claim 22
Dependent Claim
39 words
An extruder in accordance with claim 6 in which the lands have a total axial length within the range of about 1/10 to about five diameters of the core means, the diameter of the core means including the flight.
Claim 23
Dependent Claim
39 words
An extruder in accordance with claim 6 in which the perpendicular width of the narrowest-width-channel is within the range from about 1/20 to about two diameters of the core means, the diameter of the core means including the flights.
Claim 24
Dependent Claim
9 words
An extruder in accordance with claim 6 in which:
Claim 25
Dependent Claim
26 words
A mixing screw adapted for use in the barrel of a single screw extruder, comprising: at least first and second interconnected successive elements, each element having:
Claim 26
Dependent Claim
26 words
A mixing screw adapted for use in the barrel of a single screw extruder, comprising: at least first and second interconnected successive elements, each element having:
Claim 27
Dependent Claim
22 words
The mixing screw of claim 11 in which the flights on successive elements extend around the core in the same helical direction.
Claim 28
Dependent Claim
26 words
The mixing screw of claim 11 in which the flights on each of at least two successive elements extend around the core in opposite helical directions.
Claim 29
Dependent Claim
31 words
A mixing screw adapted and arranged for stream splitting for use in the barrel of a single screw extruder, comprising: at least first and second interconnected successive elements, each element having:
Claim 30
Dependent Claim
31 words
A mixing screw adapted and arranged for stream splitting for use in the barrel of a single screw extruder, comprising: at least first and second interconnected successive elements, each element having:
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |