The influence of the spinning conditions on the molecular orientation of Capron fibre

Methods of testing the solidification point of fibres spun from a polymer melt

“…The polymer melt jet diameter varies according to a more complicated, close to exponential law [3]. In this case, an unwieldy equation with difficultly determined variables is obtained.…”

“…1). Some investigators pull the fibre segments different distances from the spinneret in steadystate spinning and measure the fibre diameter under a microscope [3]. The amplitude of the change in the fibre diameter along its length, which attains • of the nominal value, is the fundamental factor that affects the error of measurement.…”

“…There are automatic methods of monitoring the solidification point based on the deviation of the fibre width caused by the effect of a short air pulse on it [2] and measurement of the diameter of the spun fibre at different distances from the spinneret [3]. However, according to the information sources, new methods of monitoring the solidification point have recently been proposed, involving a comparison of the errors of measurement and determination of the possibility of industrial implementation of these methods.…”

“…Segments of the spun fibre are photographed at high magnification [3]. The diameters of the fibre segments are measured with the photographs and a curve characterizing the thickness of the fibre as it moves away from the spinneret is plotted (Fig.…”

“…Let us consider the methods of monitoring the fibre solidification point recommended by existing information sources [2,3,[11][12][13][14]. In estimating the error of measurement of each method, the following constituents were estimated:…”