Patent US1276852A successfully refreshed from Google Patents.
Patent US3633880A successfully refreshed from Google Patents.
US3633880A
Expired / Lapsed
US
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Extrusion device
Assignee: General Electric Co
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Filing: 1970-01-08
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Granted: 1972-01-11
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Expires: 1990-01-08
Abstract
Abstract A venting section in an extrusion device for venting volatile elements from an extrudate, such as a plastic material, which venting section comprises a plurality of venting segments shaped to alternately compress and decompress said extrudate so as to free from the bulk of the plastic material said volatile elements which can then be carried away by a vacuum system through suitable vent openings formed in the barrel enclosing said venting section.
Inventors
- 👤 Larry J Newmark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:16
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/76; B29C48/765; B29C48/766; B29C48/505; B29C48/59; B29C48/763; B29C48/03; Y; Y10; Y10S; Y10S425/00; Y10S425/812
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
200 words
In an extrusion device which includes an extruder screw enclosed in a cylindrical barrel, means for venting volatile elements from an extrudate, said means comprising a first transition section at one end of said venting means, the root of said extruder screw therein being gradually tapered to a reduced diameter in the direction of travel of said extrudate; a second transition section at the other end of said venting means, the root of said extrUder screw therein being gradually tapered to an increased diameter in the direction of travel of said extrudate; a plurality of venting segments between said transition sections, each said segment including a tapered flight of increased diameter in the direction of travel to compress the extrudate passing therethrough and a deep cut in the direction of travel to decompress said extrudate as it leaves each said segment and enters the next said segment adjacent thereto, whereby volatile elements in said extrudate are given off when transition from the compressed to the decompressed state occurs; at least one vent opening in the barrel of said extrusion device adjacent said venting segments; and means enclosing said venting segments and said openings for carrying away said vented volatile elements.
Claim 2
Dependent Claim
200 words
In an extrusion device which includes an extruder screw enclosed in a cylindrical barrel, means for venting volatile elements from an extrudate, said means comprising a first transition section at one end of said venting means, the root of said extruder screw therein being gradually tapered to a reduced diameter in the direction of travel of said extrudate; a second transition section at the other end of said venting means, the root of said extrUder screw therein being gradually tapered to an increased diameter in the direction of travel of said extrudate; a plurality of venting segments between said transition sections, each said segment including a tapered flight of increased diameter in the direction of travel to compress the extrudate passing therethrough and a deep cut in the direction of travel to decompress said extrudate as it leaves each said segment and enters the next said segment adjacent thereto, whereby volatile elements in said extrudate are given off when transition from the compressed to the decompressed state occurs; at least one vent opening in the barrel of said extrusion device adjacent said venting segments; and means enclosing said venting segments and said openings for carrying away said vented volatile elements.
Claim 3
Dependent Claim
17 words
In an extrusion device in accordance with claim 1 wherein said enclosing means is a vacuum system.
Claim 4
Dependent Claim
41 words
In an extrusion device in accordance with claim 1 wherein the taper of the flight and the depth of the cut in each said segment limit the amount of compression sufficiently to prevent said extrudate from flowing through said vent openings.
Claim 5
Dependent Claim
25 words
In an extrusion device in accordance with claim 1 wherein the outside diameter of said extruder screw in each venting segment is substantially the same.
Claim 6
Dependent Claim
23 words
In an extrusion device in accordance with claim 1 wherein the root diameter provides said deep cut portion in each said venting segment.
Claim 7
Dependent Claim
26 words
In an extrusion device in accordance with claim 1 wherein vent opening is formed in the barrel of said extrusion device adjacent each said venting segment.
Claim 8
Dependent Claim
166 words
An extrusion device comprising an extruder screw and a cylindrical barrel enclosing said screw, said device including a first transition section, terminating downstream in a venting section, the root of the extruder screw in the first transition section being gradually tapered to a reduced diameter in the downstream direction; a venting section terminating downstream in a second transition section, said venting section comprising a plurality of segments, said screw in each segment in the downstream direction including a gradually tapered flight of increased diameter to a maximum point adjacent the inner surface of said barrel followed by a relatively deep portion cut to a minimum point at the root of the said screw; and a second transition section, the root of said extruder screw therein being gradually tapered to an increased diameter in the downstream direction; said device including at least one vent opening in the barrel adjacent said venting segments; and means enclosing said venting segments and said openings for carrying away vented volatile elements.
Claim 9
Dependent Claim
166 words
An extrusion device comprising an extruder screw and a cylindrical barrel enclosing said screw, said device including a first transition section, terminating downstream in a venting section, the root of the extruder screw in the first transition section being gradually tapered to a reduced diameter in the downstream direction; a venting section terminating downstream in a second transition section, said venting section comprising a plurality of segments, said screw in each segment in the downstream direction including a gradually tapered flight of increased diameter to a maximum point adjacent the inner surface of said barrel followed by a relatively deep portion cut to a minimum point at the root of the said screw; and a second transition section, the root of said extruder screw therein being gradually tapered to an increased diameter in the downstream direction; said device including at least one vent opening in the barrel adjacent said venting segments; and means enclosing said venting segments and said openings for carrying away vented volatile elements.
Claim 10
Dependent Claim
15 words
An extrusion device according to claim 7 wherein said enclosing means is a vacuum system.
Claim 11
Dependent Claim
24 words
An extrusion device according to claim 7 wherein the outside diameter of said extruder screw in each said venting segment is substantially the same.
Claim 12
Dependent Claim
21 words
An extrusion device according to claim 7 wherein a vent opening is formed in the barrel adjacent each said venting segment.
Claim 13
Dependent Claim
48 words
An extrusion device according to claim 7 wherein the taper of the flight and the depth of the cut in each said venting segment provide smearing of the extrudate across the entrance to the next venting segment and a constant velocity of extrudate travel through the vent section.
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |