US4079463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High output extruder screw
Assignee: Himont Inc
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Filing: 1977-02-28
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Granted: 1978-03-14
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Expires: 1997-02-28
Abstract
Abstract A high output extruder screw which produces high throughputs and increased melting efficiency. The screw has a feed, transition and a meter section. The transition section includes a series of alternating compression and relief zones. Each compression zone has a decreasing channel depth and each relief zone has an increasing channel depth. This promotes rapid melting of the polymer while maintaining low extrudate temperatures and allows higher screw speeds to increase throughput.
Inventors
- 👤 Richard Carson Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:18
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/505; B29C48/62; B29C48/03
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
104 words
An extruder screw comprising an elongated member having a helical channel formed therein and a constant diameter flight, said member having a feed section at one end, a meter section at the other end, and a transition section intermediate thereof, said transition section having a series of alternating compression zones and relief zones, each compression zone having a channel depth which decreases from the entrance end of said compression zone to the exit end of said compression zone, and each relief zone having a channel depth which increases from the entrance end of said relief zone to the exit end of said relief zone.
Claim 2
Dependent Claim
104 words
An extruder screw comprising an elongated member having a helical channel formed therein and a constant diameter flight, said member having a feed section at one end, a meter section at the other end, and a transition section intermediate thereof, said transition section having a series of alternating compression zones and relief zones, each compression zone having a channel depth which decreases from the entrance end of said compression zone to the exit end of said compression zone, and each relief zone having a channel depth which increases from the entrance end of said relief zone to the exit end of said relief zone.
Claim 3
Dependent Claim
31 words
An extruder screw as set forth in claim 1 wherein the exit end of each compression zone as it approaches the meter section of said screw is of progressively decreasing depth.
Claim 4
Dependent Claim
22 words
An extruder screw as set forth in claim 2 wherein the exit end of each relief zone is of progressively decreasing depth.
Claim 5
Dependent Claim
22 words
An extruder screw as set forth in claim 2 wherein the exit end of each relief zone is of progressively increasing depth.
Claim 6
Dependent Claim
23 words
An extruder screw as set forth in claim 1 wherein the depth at the exit end of each relief zone is substantially constant.
Claim 7
Dependent Claim
22 words
An extruder screw as set forth in claim 1 wherein the exit end of each relief zone is of progressively decreasing depth.
Claim 8
Dependent Claim
22 words
An extruder screw as set forth in claim 1 wherein the exit end of each relief zone is of progressively increasing depth.
Claim 9
Dependent Claim
20 words
An extruder screw as set forth in claim 1 including a mixer added to the end of said meter section.
References Cited (Backward Citations)
US2744287A
Cited
US3023456A
Cited
US3263276A
Cited
US3355769A
Cited
US3524222A
Cited
US3826477A
Cited
USRE28901E
Cited
US3870284A
Cited
US3949973A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |