US4053143A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw for use in an extruder
Assignee: Toray Industries Inc
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Filing: 1975-09-03
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Granted: 1977-10-11
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Expires: 1995-09-03
Abstract
Abstract There is provided a screw for use in an extruder comprising a melting section and a metering section and a decompression section therebetween so that the head pressure profile along the longitudinal direction of the extruder is higher than atmospheric pressure and has an inflection point, with the result that a high melting performance is attained and a high extrusion stability is ensured even at a high extrusion rate.
Inventors
- 👤 Akira Hosokawa
- 👤 Yukifusa Miyazaki
- 👤 Yoshio Yada
- 👤 Yasuo Kitamura
- 👤 Masasi Takeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:09
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/505; B29C48/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
A screw for use in a non-vent type extruder and having a diameter D, comprising: a feed section having a channel depth h 1 at a rear end thereof; a melting section subsequent to said feed section, having a channel depth gradually decreasing along a forward direction from said value h 1 to a value h 2 ; a decompression section subsequent to said melting section, having a channel depth increasing from said value h 2 to a value h 3 and gradually decreasing to a value h 4 ; and a metering section subsequent to said decompression section, where the channel depth has a constant value of h 4 ; where h 1 > h 3 > h 4 > h 2 ; ##EQU1## and where 1.5> (h 4 /h 2 )>1.15.
Claim 2
Dependent Claim
133 words
A screw for use in a non-vent type extruder and having a diameter D, comprising: a feed section having a channel depth h 1 at a rear end thereof; a melting section subsequent to said feed section, having a channel depth gradually decreasing along a forward direction from said value h 1 to a value h 2 ; a decompression section subsequent to said melting section, having a channel depth increasing from said value h 2 to a value h 3 and gradually decreasing to a value h 4 ; and a metering section subsequent to said decompression section, where the channel depth has a constant value of h 4 ; where h 1 > h 3 > h 4 > h 2 ; ##EQU1## and where 1.5> (h 4 /h 2 )>1.15.
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) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |