US3784339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disk extruder
Assignee: KUNSTSTOFFWERK Gebr ANGER AND CO GmbH
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Filing: 1971-12-21
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Granted: 1974-01-08
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Expires: 1991-12-21
Abstract
Abstract A disk extruder comprises a pair of spaced stators each having a spiral channel on its inner face and a disk-shaped rotor is rotatably mounted between the spiral channels and closely positioned to the channels so that rotation of the rotor moves a plastic molding material along the spiral channel. One stator has a central opening defining a nozzle and a cylindrical core on the other stator extends into the nozzle to define an annular gap. Hollow cylindrical sections can be attached to the outer face of the stator to extend the annular gap and a temperature controlling medium may be circulated through the sections. A cylindrical extension on the rotor is positioned within the gap and separates the plastic material flowing from each stator until this molding material reaches the cooling sections whereby a multi-ply tubular member is formed.
Inventors
- 👤 A Springfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:56
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/90; B29C48/901; B29C48/03; B29C48/09; B29C48/16; B29C48/18; B29C48/21; B29C48/30; B29C48/32; B29C48/33; B29C48/335; B29C48/36; B29C48/47
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
97 words
In an apparatus for extruding seamless tubular members from synthetic plastic material, the combination of a pair of spaced stationary stators having fixed spiral channels on their inwardly directed faces, a rotor rotatably mounted between said spiral channel faces, said stators having inlet openings in said spiral channels through which a plastic molding material is introduced, one of said stators having a central opening defining a nozzle, and a hollow cylindrical core on the other stator and extending non-rotatably into said nozzle to define an annular gap through which plastic material is extruded in a tubular shape.
Claim 2
Dependent Claim
97 words
In an apparatus for extruding seamless tubular members from synthetic plastic material, the combination of a pair of spaced stationary stators having fixed spiral channels on their inwardly directed faces, a rotor rotatably mounted between said spiral channel faces, said stators having inlet openings in said spiral channels through which a plastic molding material is introduced, one of said stators having a central opening defining a nozzle, and a hollow cylindrical core on the other stator and extending non-rotatably into said nozzle to define an annular gap through which plastic material is extruded in a tubular shape.
Claim 3
Dependent Claim
71 words
In an apparatus as claimed in claim 1 and including means within said gap for forming multi-ply tubular members, said multi-ply forming means comprising a cylindrical extension on said rotor extending into the annular gap so that plastic material from one stator spiral channel flows along the outer face of said cylindrical extension and plastic material from the other stator spiral channels flows along the inner face of said cylindrical extension.
Claim 4
Dependent Claim
49 words
In an apparatus as claimed in claim 1 and comprising means attached to said nozzle for extending said annular gap, and means on said extension means for controlling the temperature thereof whereby the rate of cooling of an extruded tubular member moving through said extension means can be regulated.
Claim 5
Dependent Claim
28 words
In an apparatus as claimed in claim 3 wherein said extension means comprises concentric cylindrical elements defining jacket means through which a temperature controlling medium can be circulated.
Claim 6
Dependent Claim
28 words
In an apparatus as claimed in claim 4 wherein the ends of said cylindrical elements are flanged, and a plurality of said elements being connected at their flanges.
Claim 7
Dependent Claim
41 words
In an apparatus as claimed in claim 3 and comprising means on the outer end of said annular gap extension means for applying a temperature controlling medium directly to an extruded tubular member as it emerges from said annular gap extension.
Claim 8
Dependent Claim
35 words
In an apparatus as claimed in claim 6 wherein the portion of the annular gap extension immediately before the temperature controlling medium applying means has a width greater than the width of the annular gap.
Claim 9
Dependent Claim
41 words
In an apparatus as claimed in claim 3 wherein said gap extension means comprises a plurality of serially connected sections, and means on each of said sections for defining hollow chambers therein through which a temperature controlling medium can be circulated.
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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |