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US3632092A Expired / Lapsed US ⏱️ 0.0 years remaining

Stabilization procedure and apparatus for polymeric fibrous materials

Assignee: Celanese Corp
•
Filing: 1969-10-10
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Granted: 1972-01-04
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Expires: 1989-10-10
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Abstract

Abstract An improved continuous process and apparatus are provided for the uniform stabilization of a strand of polymeric fibrous material which is capable of undergoing thermal stabilization. The strand is continuously wound in a plurality of turns and continuously unwound from at least one rotating roll having a porous surface while a gas at an elevated temperature is expelled outwardly through the surface of the porous roll and penetrates the fibrous configuration of the strand wound upon the roll. In a preferred apparatus in accordance with the present invention the porous roll situated within a heat treatment chamber is internally provided with a plurality of individually adjustable heating elements along its length. The resulting stabilized material retains its original fibrous configuration essentially intact, exhibits enhanced thermal stability, and is capable of undergoing carbonization. In a particularly preferred embodiment of the invention the precursor is an acrylonitrile homopolymer and air having a temperature of at least about 260* C. is expelled through the surface of the rotating porous roll.

Inventors

  • 👤 Dagobert E Stuetz

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 02:15
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/20; D01F9/21; D01F9/22; D01F9/225; B; B29; B29B; B29B13/00; B29B13/02; B29B13/023; B29C; B29C71/00; B29C71/02; D01D; D01D10/00; D01D10/02; D01D10/04; D01D10/0436

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 18 words
An apparatus according to claim 1 wherein said rotatable roll having a porous surface has a tapered configuration.
Claim 2
Dependent Claim 38 words
Apparatus according to claim 1 wherein said rotatable roll having a porous surface has an essentially uniform cylindrical configuration, and said apparatus is additionally provided with a rotatable skewed roll in a paired relationship to said rotatable roll.
Claim 3
Dependent Claim 22 words
An apparatus according to claim 1 wherein means are provided for supplying said gas at successively elevated temperatures along said rotatable roll.
Claim 4
Independent Claim 158 words
An apparatus for the continuous stabilization of a strand of polymeric fibrous material comprising a substantially enclosed heat treatment chamber, means for continuously introducing a strand of fibrous material into said heat treatment chamber, means for continuously withdrawing a strand of fibrous material from said heat treatment chamber, at least one rotatable roll situated within said chamber having a porous surface, drive means capable of rotating said roll, central conduit means essentially coextensive with the length of said roll, dividing means positioned about the circumference of said central conduit means capable of dividing means capable of dividing the interior of said roll into a plurality of modules which communicate with the porous surface of said roll and said central conduit means, resistance heating means situated within said modules, means for supplying current to said resistance heating means, and means for supplying current to said resistance heating means, and means for supplying a gas to said central conduit means.
Claim 5
Dependent Claim 18 words
An apparatus according to claim 5 wherein said rotatable roll having a porous surface has a tapered configuration.
Claim 6
Dependent Claim 43 words
An apparatus according to claim 5 wherein said rotatable roll having a porous surface has an essentially uniform cylindrical configuration, and said apparatus is additionally provided with a rotatable skewed roll in a paired relationship to said rotatable roll having a porous surface,
Claim 7
Dependent Claim 25 words
An apparatus according to claim 5 wherein said means for continuously introducing a strand of fibrous material into said heat treatment chamber is a bobbin.
Claim 8
Dependent Claim 25 words
An apparatus according to claim 5 wherein said means for continuously withdrawing a strand of fibrous material from said heat treatment zone is a bobbin.
Claim 9
Dependent Claim 21 words
An apparatus according to claim 5 wherein exhaust means are provided to withdraw off gasses generated within said heat treatment chamber.
Claim 10
Dependent Claim 21 words
An apparatus according to claim 5 wherein said means for supplying a gas to said central conduit means is a fan.

References Cited (Backward Citations)

US2701765A Cited
US3161484A Cited
US3387833A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-01-03 1975-07-05 1976-01-04 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-01-03 1979-07-05 1980-01-04 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-01-03 1983-07-05 1984-01-04 $7700.00 Window Closed / Lapsed

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