ИСТИНА

FIELD: manufacture of updated gasket materials from graphite tape, foil, strips or sheets. SUBSTANCE: thermally expanded graphite powder is rolled into cloth, 0.1-10 mm thick. In the course of rolling, cloth is subjected to nondestructive testing by means of one or several pairs of measuring sensors placed along its width; each pair of sensors includes transmitting and receiving sensors which are placed on either side of cloth; They are subjected to electromagnetic radiation at frequency of 10 3-106 Hz and phase shift angle relative to phase of oscillations of wave falling on specimen is measured. Frequency of oscillations is fixed. For obtaining enhanced accuracy of measurements, correcting pair of sensors may be mounted in parallel with measuring sensors. Present density of material is determined by calibration graph of material density versus phase shift angle which is plotted before measurements. At plotting the graph, density of material is determined by direct weight method. Thus, rolling parameters are corrected according to results of determination of present density. EFFECT: improved quality of flexible material; immediate elimination technological malfunction. 6 cl, 3 dwg, 1 ex