US4201480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion apparatus for manufacturing foamed thermoplastic material
Assignee: KraussMaffei Extrusion GmbH
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Filing: 1978-08-30
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Granted: 1980-05-06
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Expires: 1998-08-30
Abstract
Abstract Extrusion apparatus for manufacturing blow moulded sheets of expanded polystyrene wherein, following an extruder there is a static cooler/mixer member comprising inner and outer cooling surfaces defining between them an annular passage, the inner cooling surface having a star-shaped outline when viewed in cross-section with the points of the star extending at an oblique angle to the longitudinal axis. Preferably the star-shaped outline is provided by folded metal strips several of which are provided alternately angled and staggered with respect to one another.
Inventors
- 👤 Wilhelm Brand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:24
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/50; B29C44/505; B29C48/00; B29C48/25; B29C48/36; B29C48/362; B29C48/03; B29C48/07
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
166 words
Extrusion apparatus for manufacturing foamed thermoplastics material, in particular for blow moulding sheets of expanded polystyrene, comprising an extruder for melting the plastics material and a static cooling and mixing member disposed downstream of the extruder, said static cooling and mixing member including means defining an outer cooling surface and means defining an inner cooling surface, said means defining said inner and outer cooling surfaces defining between them an annular passage through which the expansible plastics material flows in an axial direction, and at least one metal strip member positioned in said annular passage, said metal strip member being star-shaped in cross section having outer points which engage said means defining said outer cooling surface and inner points which engage said means defining said inner cooling surface, thereby defining inner and outer material passages, the edges of said metal strip member extending at an oblique angle relative to the longitudinal axis of said static cooling and mixing member, whereby said material is divided and evenly cooled.
Claim 2
Dependent Claim
166 words
Extrusion apparatus for manufacturing foamed thermoplastics material, in particular for blow moulding sheets of expanded polystyrene, comprising an extruder for melting the plastics material and a static cooling and mixing member disposed downstream of the extruder, said static cooling and mixing member including means defining an outer cooling surface and means defining an inner cooling surface, said means defining said inner and outer cooling surfaces defining between them an annular passage through which the expansible plastics material flows in an axial direction, and at least one metal strip member positioned in said annular passage, said metal strip member being star-shaped in cross section having outer points which engage said means defining said outer cooling surface and inner points which engage said means defining said inner cooling surface, thereby defining inner and outer material passages, the edges of said metal strip member extending at an oblique angle relative to the longitudinal axis of said static cooling and mixing member, whereby said material is divided and evenly cooled.
Claim 3
Dependent Claim
20 words
Extrusion apparatus as claimed in claim 1, wherein said folded edges of said strip member extend parallel to one another.
Claim 4
Dependent Claim
55 words
Extrusion apparatus as claimed in claim 2, wherein at least two metal strip members folded in the shape of a star are provided in succession one to the other in an axial direction, the points of both of which extend at an oblique angle to said longitudinal axis and are arranged alternately in opposing directions.
Claim 5
Dependent Claim
97 words
Extrusion apparatus as claimed in claim 3, wherein said two metal strip members are staggered in relation to one another in such a way that the edges of one of said metal strip members are located in a peripherally staggered position relative to the edges of the other strip member whereby said material is divided as it flows from one member to the other, at least certain of the material flowing from the inner material passages of the upstream member to the outer material passages of the downstream member thereby to thoroughly mix and cool the material.
Claim 6
Dependent Claim
18 words
Extrusion apparatus as claimed in claim 3, wherein said two metal strips are firmly connected to one another.
Claim 7
Dependent Claim
35 words
Extrusion apparatus as claimed in claim 1, wherein flanks of said metal strip have perforations therein to permit the flow of material between said inner and outer material passages, thereby further increasing the mixing action.
Claim 8
Dependent Claim
85 words
Extrusion apparatus as claimed in claim 1, wherein four metal strip members are provided in succession in an axial direction, the edges and points of adjacent strip members being peripherally staggered whereby said material is divided as it flows from one strip member to the next, at least certain of the material flowing from the inner or outer material passages of an upstream member to the outer or inner material passages, respectively, of the adjacent downstream member thereby to thoroughly mix and cool the material.
References Cited (Backward Citations)
DK106404C
Cited
GB1101504A
Cited
GB1189484A
Cited
US3358749A
Cited
US3582045A
Cited
US3687582A
Cited
US3711067A
Cited
US3704006A
Cited
US3652061A
Cited
US3751377A
Cited
US3942765A
Cited
US4040256A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-05-06 | 1983-11-05 | 1984-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-06 | 1987-11-05 | 1988-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-06 | 1991-11-05 | 1992-05-06 | $7700.00 | Window Closed / Lapsed |