US3633494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw extruders with baffle plates and expeller bodies
Assignee: Oerlikon Barmag AG
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Filing: 1970-05-20
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Granted: 1972-01-11
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Expires: 1990-05-20
Abstract
Abstract The screw extruder for the processing of liquid melts or pulverulent, granular or similar thermoplastic materials, especially of those with liquidlike flow behavior, wherein the feed hopper of the screw press has at least one stationary, vertically adjustable, radial baffle plate and also one or more expeller bodies inside a spiral impeller revolving in the annular space between a conical segment of the hopper and the baffle plates and expeller bodies.
Inventors
- 👤 Heinz Schippers
- 👤 Hans Siemetzki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:35
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/285; B29C48/286; B29C48/03; B29C48/288
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
102 words
A screw press particularly adapted for processing thermoplastic polymer particles having liquidlike flow characteristics and thermoplastic polymer melts, which comprises a feed hopper from the screw press, a vertical screw rotatable in a feed passage for conveying thermoplastic polymer particles or melt from said hopper to the feed portion of the screw of said screw press, at least one stationary radial bAffle plate in the lower portion of said hopper, a spiral impeller and means for orbiting said impeller about said baffle plate in an annular space between the radially outer edge of said baffle plate and the wall of said hopper.
Claim 2
Dependent Claim
102 words
A screw press particularly adapted for processing thermoplastic polymer particles having liquidlike flow characteristics and thermoplastic polymer melts, which comprises a feed hopper from the screw press, a vertical screw rotatable in a feed passage for conveying thermoplastic polymer particles or melt from said hopper to the feed portion of the screw of said screw press, at least one stationary radial bAffle plate in the lower portion of said hopper, a spiral impeller and means for orbiting said impeller about said baffle plate in an annular space between the radially outer edge of said baffle plate and the wall of said hopper.
Claim 3
Dependent Claim
49 words
A screw press as claimed in claim 1, said lower portion of said hopper being a conical wall, the radially outer edge of said baffle plate being substantially parallel to and spaced from said conical wall, and the spiral of said impeller tapering in conformity with said conical wall.
Claim 4
Dependent Claim
21 words
A screw press as claimed in claim 1, and means fixedly joining said impeller with said vertical screw for rotation together.
Claim 5
Dependent Claim
30 words
A screw press as claimed in claim 1, a tubular support extending vertically axially through said hopper, and a plurality of said radial baffle plates mounted on said tubular support.
Claim 6
Dependent Claim
21 words
A screw press as claimed in claim 4, and a drive shaft for said vertical screw extending through said tubular support.
Claim 7
Dependent Claim
21 words
A screw press as claimed in claim 5, and means fixedly joining said impeller with said vertical screw for rotation together.
Claim 8
Dependent Claim
23 words
A screw press as claimed in claim 4, and means for raising and lowering said tubular support and the baffle plates mounted thereon.
Claim 9
Dependent Claim
43 words
A screw press as claimed in claim 1, characterized further by a plurality of said radial baffle plates in said lower portion, and expeller bodies between said radial plates for deflecting downwardly flowing polymer particles or melt radially outwardly into said annular space.
Claim 10
Dependent Claim
23 words
A screw press as claimed in claim 8, and means for raising and lowering said expeller bodies relative to said radial baffle plates.
Claim 11
Dependent Claim
40 words
A screw press as claimed in claim 1 wherein said hopper is a closed hopper, means for drawing a vacuum in said hopper, and pipe means for supplying said particles or melt to said hopper while it is under vacuum.
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 |