A method was developed for measuring the temperature of a fiber in the region of exposure to laser radiation. It was shown that the temperature is not only a function of the energy flux density but also the fiber speed. The reason why the interplanar distances stop increasing with an increase in the energy flux density of the laser radiation was given based on an analysis of the temperature transitions in polycaproamide fibers. It was found that the temperature of the sample remained constant in
thawing
of the molecular mobility.
St. Petersburg Institute of Textile and Light Industry. Translated from Khimicheskie Volokna, Vol. 25, No. 1, pp. 22–24, January–February, 1993.