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Patent US3600748A successfully refreshed from Google Patents.
US3600748A
Expired / Lapsed
US
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Extrusion die
Assignee: BASF Corp
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Filing: 1969-05-01
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Granted: 1971-08-24
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Expires: 1989-05-01
Abstract
Abstract Extrusion die embodying a heated rear section, a cooled front section with a plurality of extrusion orifices therein, passage means extending through the heated rear section for feeding thermoplastic polymer melt to the orifices, means such as an air space insulating the cooled front section from the heated rear section, and thin-walled, melt-conducting ring gaskets bridging the space between said sections.
Inventors
- 👤 Knud Faehndrich
- 👤 Edmund Lindner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:39
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/78; B29C48/86; B29C48/87; B29C48/03; B29C48/06; B29C48/09; B29C48/10; B29C48/30; B29C48/345; B29C48/865; B29C48/875; B29C48/07; B29C48/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
95 words
A die for extruding polymer melts comprising a rear section and a front section, a plurality of extrusion orifices in said front section, passage means extending through said rear section for feeding polymer melt to said orifices and including passages aligned with respective orifices in said front member, means to heat said rear section, means to cool said front section, said front section being spaced from said rear section, and thinwalled, metal ring gaskets of low thermal conductivity bridging the space between said sections and respectively connecting said orifices and said passages respectively aligned therewith.
Claim 2
Dependent Claim
95 words
A die for extruding polymer melts comprising a rear section and a front section, a plurality of extrusion orifices in said front section, passage means extending through said rear section for feeding polymer melt to said orifices and including passages aligned with respective orifices in said front member, means to heat said rear section, means to cool said front section, said front section being spaced from said rear section, and thinwalled, metal ring gaskets of low thermal conductivity bridging the space between said sections and respectively connecting said orifices and said passages respectively aligned therewith.
Claim 3
Dependent Claim
55 words
A die as claimed in claim 1 wherein said rear section comprises a front metal plate and a rear metal plate in face-to-face contact, said passages extending between the front and rear faces of said front plate, and said passage means further including a manifold passage in said rear plate and communicating with said passages.
Claim 4
Dependent Claim
44 words
A die as claimed in claim 2 wherein said orifices are arranged in a line across said front member, and said manifold passage is an elongated passage extending across said rear section and communicating with all of said aligned passages in said rear section.
Claim 5
Dependent Claim
20 words
A die as claimed in claim 1 wherein said space is a thermal-insulating airgap between said front and rear sections.
Claim 6
Dependent Claim
22 words
A die as claimed in claim 1 wherein said ring gaskets have wall thicknesses in the range of 0.1 to 2.0 mm.
References Cited (Backward Citations)
US3222719A
Cited
US3212132A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |