Patent US3883718A successfully refreshed from Google Patents.
US3883718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for thermally processing of continuous lengths of fibrous materials
Assignee: Celanese Corp
•
Filing: 1974-01-31
•
Granted: 1975-05-13
•
Expires: 1994-01-31
Abstract
Abstract An improved apparatus is provided for the thermal treatment of continuous lengths of fibrous materials (e.g. drawing, relaxing, drying, etc.) which comprises an elongated heat treatment tube enclosed in a coaxial cylindrical jacket. A heating element may be positioned within the annular space that surrounds the heat treatment tube to impart heat to a fluid introduced into the annular space at the inlet end of the apparatus. This heated fluid may then be directed both to an aspirator at the inlet end of the heat treatment tube and to a gas port which communicates with the inlet end of the apparatus. Valve means are provided for closing the gas port at the start-up of operations to permit the aspirated gas to pull the end of the fibrous material through the heat treatment tube. After start-up the gas port is reopened and the fibrous material preheated before it enters the heat treatment tube. The fibrous material also is heated by radiation from the wall of the heat treatment tube. Optionally, the exit end of the apparatus can be provided with means to recycle a portion of the fluid. The apparatus is particularly suited for the thermal treatment (e.g. hot drawing) of a continuous length of a multifilament polybenzimidazole fibrous material.
Inventors
- 👤 George R Ferment
- 👤 Stuart M French
- 👤 Paul A Sessa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:57
CPC Classifications
F; F26; F26B; F26B13/00; F26B13/001; D; D01; D01D; D01D10/00; D01D10/02; D01D10/04; D01D10/0436; D01D10/0481; D02; D02J; D02J13/00; D02J13/001; D06; D06B; D06B3/00; D06B3/04; D06B3/045
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
236 words
In an apparatus for thermally processing continuous lengths of fibrous materials wherein said fibrous materials are passed through a heating unit to take-up means, said heating unit including, an elongated cylindrical heat treatment tube having an inlet end and outlet end for the continuous passage therethrough of said fibrous materials to be heat treated, wherein the improvement comprises: an elongated cylindrical jacket coaxially surrounding said heat treatment tube for providing an annular chamber about said heat treatment tube; end closures being positioned in the annular chamber between said cylindrical jacket and said heat treatment tube closing the annular chamber at its ends; means for introducing a fluid into said annular chamber; an electric resistance heating coil mounted within the interior of said cylindrical jacket for heating the fluid and promoting the conduction of heat from said annular chamber through said heat treatment tube to heat continuous lengths of fibrous materials passing therethrough; means connected to the inlet end of said heat treatment tube for introducing heated fluid from said annular chamber into said heat treatment tube to thereby further heat said continuous lengths of fibrous materials passing through said heat treatment tube; and heat recovery means connected at the outlet end of said cylindrical heat treatment tube for receiving at least a portion of the heat passing through the outlet end of said cylindrical heat treatment tube and for delivering said heat into said annular chamber.
Claim 2
Dependent Claim
236 words
In an apparatus for thermally processing continuous lengths of fibrous materials wherein said fibrous materials are passed through a heating unit to take-up means, said heating unit including, an elongated cylindrical heat treatment tube having an inlet end and outlet end for the continuous passage therethrough of said fibrous materials to be heat treated, wherein the improvement comprises: an elongated cylindrical jacket coaxially surrounding said heat treatment tube for providing an annular chamber about said heat treatment tube; end closures being positioned in the annular chamber between said cylindrical jacket and said heat treatment tube closing the annular chamber at its ends; means for introducing a fluid into said annular chamber; an electric resistance heating coil mounted within the interior of said cylindrical jacket for heating the fluid and promoting the conduction of heat from said annular chamber through said heat treatment tube to heat continuous lengths of fibrous materials passing therethrough; means connected to the inlet end of said heat treatment tube for introducing heated fluid from said annular chamber into said heat treatment tube to thereby further heat said continuous lengths of fibrous materials passing through said heat treatment tube; and heat recovery means connected at the outlet end of said cylindrical heat treatment tube for receiving at least a portion of the heat passing through the outlet end of said cylindrical heat treatment tube and for delivering said heat into said annular chamber.
Claim 3
Dependent Claim
60 words
In an apparatus for thermally processing continuous lengths of fibrous materials as defined in claim 1, said means for introducing the heated fluid into said heat treatment tube comprises: aspirator means coaxially mounted at the inlet end of said heat treatment tube for receiving the heated fluid from said annular chamber and aspirating the fluid into said heat treatment tube.
Claim 4
Dependent Claim
53 words
In an apparatus for thermally processing continuous lengths of fibrous materials as defined in claim 2, and wherein the improvement further comprises: means connected to said aspirator means for introducing auxiliary heating fluid into said aspirator, and thereby said heat treatment tube, from a source of heated fluid remote from said annular chamber.
Claim 5
Dependent Claim
72 words
In an apparatus for thermally processing continuous lengths of fibrous materials as defined in claim 2, and wherein the improvement further comprises: preheat means coaxially connected at an inlet end of said aspirator means and being selectively operable to receive heated fluid from said annular chamber for introducing heated fluid into the inlet end of said aspirator means and for minimizing the reception of relatively cooler ambient air into said aspirator means.
Claim 6
Dependent Claim
40 words
In an apparatus for thermally processing continuous lengths of fibrous materials as defined in claim 4, wherein said preheat means further comprises: means for selectively regulating the quantity of heated fluid introduced from said annular chamber into said preheat means.
Claim 7
Dependent Claim
75 words
In an apparatus for thermally processing continuous lengths of fibrous materials as defined in claim 1, wherein said heat recovery means comprises: a porous tube coaxially mounted at the outlet end of said cylindrical heat treatment tube; and housing means concentrically positioned about said porous tube and being in fluid communication with said annular chamber for receiving heated fluid passing through said porous tube and delivering the thus received heated fluid into said annular chamber.
Claim 8
Dependent Claim
62 words
In an apparatus for thermally processing continuous lengths of fibrous materials as defined in claim 6, wherein said heat recovery means further comprises: an annular restriction connected at the outlet end of said porous tube to promote passage of heated fluid from said cylindrical heat treatment tube through said porous tube and into said housing means for delivery to said annular chamber.
References Cited (Backward Citations)
US2823292A
Cited
US3034277A
Cited
US3303169A
Cited
US3277228A
Cited
US3551549A
Cited
US3439391A
Cited
US3496332A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |