US4056597A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and die for extrusion of a resinous material
Assignee: Phillips Petroleum Co
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Filing: 1975-04-03
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Granted: 1977-11-01
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Expires: 1995-04-03
Abstract
Abstract A resinous material is extruded through an orifice in a die to produce a strand, the orifice having an inlet zone, a cylindrical zone and an outlet zone, the inlet zone converging in the direction of flow of the resinous material and attached to one end of the cylindrical zone and the outlet zone diverging in the direction of flow of the resinous material and attached to the other end of the cylindrical zone. A die for extrusion of a resinous material is provided.
Inventors
- 👤 Earl D. Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:43
CPC Classifications
D; D01; D01D; D01D4/00; D01D4/02; B; B29; B29C; B29C48/00; B29C48/25; B29C48/27; B29C48/272; B29C48/03; B29C48/05
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
126 words
A process comprising: extruding a resinous material selected from the group consisting of polyethylene, polypropylene, polystyrene and styrene-butadiene copolymers through an orifice in a die to produce a strand, said orifice comprising an inlet zone, a cylindrical zone and an outlet zone, in that order; said inlet zone converging in the direction of flow of said resinous material and attached to one end of said cylindrical zone; and said outlet zone having a shape resembling a portion of the area circumscribed by a torus wherein the radius of curvature is in the range of from about 1/2 to 2 times the radius of the strand produced, diverging in the direction of flow of said resinous material and attached to the other end of said cylindrical zone.
Claim 2
Dependent Claim
126 words
A process comprising: extruding a resinous material selected from the group consisting of polyethylene, polypropylene, polystyrene and styrene-butadiene copolymers through an orifice in a die to produce a strand, said orifice comprising an inlet zone, a cylindrical zone and an outlet zone, in that order; said inlet zone converging in the direction of flow of said resinous material and attached to one end of said cylindrical zone; and said outlet zone having a shape resembling a portion of the area circumscribed by a torus wherein the radius of curvature is in the range of from about 1/2 to 2 times the radius of the strand produced, diverging in the direction of flow of said resinous material and attached to the other end of said cylindrical zone.
Claim 3
Dependent Claim
30 words
The process of claim 1 wherein said resinous material is a styrene-butadiene copolymer containing from about 70 to about 95 percent styrene units based on total weight of the copolymer.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein said inlet zone is a converging truncated cone.
Claim 5
Dependent Claim
134 words
A die for extruding a strand of resinous material comprising: a base having at least one orifice through which said resinous material is extruded; said orifice having an inlet portion, a cylindrical portion and an outlet portion, in that order, said inlet portion being in the form of a truncated cone converging in the direction of flow of said resinous material and attached to one end of said cylindrical portion; and said outlet portion being in the form of a portion of the area circumscribed by a torus wherein the radius of the circle generating the torus is in the range of from about 1/2 to 2 times the radius of the strand produced, diverging in the direction of flow of said resinous material and attached to the other end of said cylindrical portion.
Claim 6
Dependent Claim
134 words
A die for extruding a strand of resinous material comprising: a base having at least one orifice through which said resinous material is extruded; said orifice having an inlet portion, a cylindrical portion and an outlet portion, in that order, said inlet portion being in the form of a truncated cone converging in the direction of flow of said resinous material and attached to one end of said cylindrical portion; and said outlet portion being in the form of a portion of the area circumscribed by a torus wherein the radius of the circle generating the torus is in the range of from about 1/2 to 2 times the radius of the strand produced, diverging in the direction of flow of said resinous material and attached to the other end of said cylindrical portion.
Claim 7
Dependent Claim
30 words
The die of claim 4 further in combination with a screw extruder having an inlet and an outlet wherein said die is attached to the outlet of said screw extruder.
Claim 8
Dependent Claim
15 words
The die of claim 4 further comprising a counterbore portion positioned adjacent said inlet portion.
Claim 9
Dependent Claim
18 words
The process of claim 1 wherein said orifice further comprises a counterbore zone positioned adjacent said inlet zone.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-31 | 1981-05-02 | 1981-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-31 | 1985-05-02 | 1985-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-31 | 1989-05-02 | 1989-11-01 | $7700.00 | Window Closed / Lapsed |