Patent US4150719A successfully refreshed from Google Patents.
US4150719A
Expired / Lapsed
US
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Process and apparatus for controlled and gentle heating or cooling of viscous solutions or melts of thermoplastics
Assignee: BASF SE
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Filing: 1976-12-02
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Granted: 1979-04-24
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Expires: 1996-12-02
Abstract
Abstract A process and an apparatus for heating or cooling very viscous solutions or melts of thermoplastics in the form of thin layers. The plastic solution or melt is spread under the temperature conditions of the feed solution or melt, and the thin layers are heated stepwise so that the temperature difference between the heat transfer medium and the solution or melt is at all times less than 50° C. and preferably less than 20° C. Viscous solutions or melts of thermoplastics can be heated or cooled rapidly and uniformly under gentle and controlled conditions, to prepare the solutions or melts for further treatment in conventional equipment.
Inventors
- 👤 Gunter Thielen
- 👤 Johann Zizlsperger
- 👤 Rudi W. Reffert
- 👤 Hans Wild
- 👤 Peter Fink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:32
CPC Classifications
F; F28; F28F; F28F7/00; F28F7/02; B; B29; B29B; B29B13/00; B29B13/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
149 words
An apparatus for the controlled temperature conditioning of a viscous solution or melt of a thermoplastic material, said apparatus comprising: at least two solid metal segments each having correspondingly formed side surfaces designed to abut each other in a leak-tight manner when in an assembled form so as to allow heat to flow therebetween; a series of generally parallel slip-shaped channels formed at a substantially uniform depth in at least one of said abutting side surfaces for receiving and guiding said thermoplastic material from a charging end of said assembled segments to a discharging end thereof; and said segments being subdivided into a plurality of zones extending generally across said channels, said segment zones having cavity-like passages formed therein for receiving a heat carrier medium, whereby said zones can be operated at different temperatures for the controlled temperature conditioning of said thermoplastic material as it passes through said channels.
Claim 2
Independent Claim
149 words
An apparatus for the controlled temperature conditioning of a viscous solution or melt of a thermoplastic material, said apparatus comprising: at least two solid metal segments each having correspondingly formed side surfaces designed to abut each other in a leak-tight manner when in an assembled form so as to allow heat to flow therebetween; a series of generally parallel slip-shaped channels formed at a substantially uniform depth in at least one of said abutting side surfaces for receiving and guiding said thermoplastic material from a charging end of said assembled segments to a discharging end thereof; and said segments being subdivided into a plurality of zones extending generally across said channels, said segment zones having cavity-like passages formed therein for receiving a heat carrier medium, whereby said zones can be operated at different temperatures for the controlled temperature conditioning of said thermoplastic material as it passes through said channels.
Claim 3
Dependent Claim
25 words
An apparatus as set forth in claim 1 wherein said channels are formed with a widened cross-sectional depth at the charging end of said segments.
Claim 4
Dependent Claim
19 words
An apparatus as set forth in claim 1 wherein the width of said channels is uniform throughout said segments.
Claim 5
Dependent Claim
18 words
An apparatus as set forth in claim 1 wherein the width of said channels varies throughout said segments.
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) | 1982-04-23 | 1982-10-23 | 1983-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-23 | 1986-10-23 | 1987-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-23 | 1990-10-23 | 1991-04-24 | $7700.00 | Window Closed / Lapsed |