Bulletin Samara State Agricultural AcademyBulletin Samara State Agricultural Academy1997-32252782-4225Samara State Agrarian University10853510.55170/19973225_2022_7_1_20Research ArticleINFLUENCE OF DIMENSIONAL CHARACTERISTICS OF THE EXTRUDER MATRIX ON THE PROPERTIES OF EXTRUDATEKurochkinAnatoly A.Doctor of Technical Sciences, Professoranatolii_kuro@mail.ruFrolovDmitry I.Candidate of Technical Sciences, Associate Professorsurr@bk.ruPenza State Technological University1503202271283703062022Copyright © 2022, Kurochkin A.A., Frolov D.I.2022<p>The purpose of the research is to substantiate the dependence of properties of extrudate and specific mechanical energy of the extrusion process on the dimensional characteristics of the extruder matrix. The study of influence of the dimensional characteristics of holes of an extruder matrix on processing properties of the resulting extruded product, in particular, on the expansion coefficients of an extrudate and efficiency of an extruder. The design features and the shape of a matrix which can ensure a uniform flow, as well as correct consistency of the extruded mixture, require extensive theoretical and experimental studies. To provide theoretical substantion the geometric parameters of the extruder matrix and the physical occurrence with raw materials, the equations of fluid flow through spinneret holes are presented. The equations for estimating the pressure drop through the flow section of the matrix at a given rate of raw materials move for a non-Newtonian mixture are presented. The material for extrusion is corn grit. The experiments were carried out involving an experimental single-screw extruder type EK-40. The matrix with holes was chosen according to the experimental plan. The experimental data were analyzed using dispersion analysis. All statistical tests were performed using the STATISTICA software. The results of influence of a hole diameter, the length of the matrix channel and their ratio on the specific mechanical energy and the expansion coefficients of the extrudate were obtained. With an increase of diameter in the extruder spinneret hole, the specific mechanical energy decreases from 100 J/kg with a hole diameter of 2 mm to 50 J/kg with a one of 4 mm. The size of an extruder spinneret hole had the greatest impact on the radial expansion coefficient of the extrudate. With an increase of the hole diameter from 2 to 4 mm, the radial expansion coefficient of the extrudate decreased approximately by 38% to 6.96. The increase of the radial expansion coefficient is mainly due to a decrease of a hole with</p>extrusionmatrixextrudate propertiescornexpansion coefficientэкструзияматрицасвойства экструдатакукурузакоэффициент расширения[Бахчевников О. Н., Брагинец С. В. Экструдирование растительного сырья для продуктов питания (обзор) // Техника и технология пищевых производств. 2020. 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