METHOD OF PREPARING A MICROSTRUCTURE FOR CONTROLLING PARAMETERS OF A FIBROUS CELLULOSE-CONTAINING MATERIAL AND A DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2025 - IPC G01N21/89 

FIELD: measuring.

SUBSTANCE: invention relates to a method and a device for preparing samples for microscopic examination of fibrous cellulose-containing material. Method of preparing a microstructure for controlling parameters of a fibrous cellulose-containing material involves preparing a cellulose-containing fibrous material with given properties in a pre-fixed position of the sample, obtaining an image of cross sections with their repetition, which are subsequently converted into a vector format with selection of cut areas of the fibrous material, determination of their location and formation of 3D-models of fibres on cross-sections, with formation of 3D-microstructure of fibrous cellulose material with subsequent determination of 3D-microstructure as a whole, as well as parameters of cellulose-containing fibrous material. Depth of the sections is determined by fixing the sample in the base and a calibration element in the form of a sphere by pouring into a transparent synthetic polymer, wherein the images of the sections are obtained by microscopic examination and a digital camera. Samples of solid fibrous cellulose-containing material and a calibration element in the form of a sphere, fixed relative to each other, are ground at a rotation speed of 150 rpm, and in time from 10 to 60 minutes, section depth is adjusted within range of 1 to 5 mcm, and after each polishing cycle, the section image is formed and the section depth is specified based on the change in the radius of the calibration element in the form of a sphere on the planes of the cross sections. After each polishing cycle, the depth of the sections is determined, from which 3D models of fibres and 3D microstructure as a whole are formed with accuracy of up to 1 mcm, and geometrical parameters of the fibres are determined from which the parameters of the cellulose-containing fibrous material are predicted.

EFFECT: increased reliability of prediction of density, porosity, uniformity of moulding, quality of surface, mechanical properties on surface area of contact of fibres and uniformity of their distribution due to increased accuracy of geometric parameters of fibres, namely, volume of fibrous material, perimeter, centre of mass of fibres, surface of contact of fibres due to reduction of error of measurement of depth of cut.

2 cl, 7 dwg, 2 tbl