Methods for measurement and evaluation of screw-disk extruder autothermity

Abstract

W artykule przedstawione zostały metody oceny autotermiczności wytłaczarki ślimakowo-tarczowej. Jednym z zagadnień jest określenie kryterium elementarnego i kompleksowego oceny autotermiczności wytłaczarki ślimakowo-tarczowej, a drugim określenie przestrzeni, w której występuje autotermiczność, a także określenie jej wpływu na uplastycznianie i jednorodność tworzywa w strefie tarczowej wytłaczarki ślimakowo-tarczowej.The paper deals with methods for measurement and evaluation of autothermity of an innovative, experimental, autothermal screw-disk extruder used for processing polymer materials [1, 2, 3, 4, 5, 6, 7, 8, 9] (Figs. 1, 2). One of the problems presented in the paper concerns determination of the elementary criteria for evaluation of the screw-disk extrude autothermity, namely thermal stability - St ε {0, 2, 4, 6, 8} (Fig. 3) and the quality of extrudate - Jw ε {I, II, III}, where Jw = I means good quality of extrudate, Jw = II means nearly good quality of fusion and homogenization of extrudate and Jw = III means poor fusion of extrudate (Fig. 4), and also the complex criterion for evaluation of autothermity, that provides a general state of autothermity - Ja ε {0, 2, 4, 6, 8}. The second problem is deter-mining the space in which the autothermity occurs (Fig. 5), as well as its influence on plasticization and homogeneity of material in a disk zone of a screw-disk extruder [10, 11, 12, 13, 14]. The above elementary and complex criteria make it possible for the quality of the extrusion autothermity in a screw-disk extruder to be expressed comprehensively, whereas the nature of the spaces obtained allows an influence of individual factors on achieving the autothermal effect of extrusion in a screw-disk extruder to be analysed