STABILIZATION OF POLYACRYLONITRILE PRECURSOR YARNS
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United States of America Patent
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Issued Date -
Jun 7, 2012
app pub date -
Aug 31, 2010
filing date -
Sep 11, 2009
priority date (Note) -
Abandoned
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Abstract
A method for stabilizing yarns made from polyacrylonitrile using chemical stabilization reactions, including: generating a field of high-frequency electromagnetic waves in an application space of an applicator, which has areas with minimum electric field strength and areas with maximum electric field strength, the maximum electric field strength in the application space being in a range from 3 to 150 kV/m; continuously supplying a precursor yarn based on a polyacrylonitrile polymer into the application space, and conveying the precursor yarn through the application space and through the field of the high-frequency electromagnetic waves; introducing a process gas into the application space and conveying the process gas through the application space with a flow rate of at least 0.1 m/s relative to the precursor yarn being conveyed through the application space, wherein a temperature of the process gas is in a range between 150 and 300° C., so that it is above a critical minimum temperature Tcrit and below a maximum temperature Tmax.
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