Extrusion of polymers during ultrasonic action

• Published in: Journal of applied polymer science 2004-01, Vol.91 (2), p.693-696
• Main Authors: Kiselyova, O. F., Panov, A. A., Minsker, K. S., Panov, A. K., Zaikov, G. E.
• Format: Article
• Language: English
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.12959

The highly elastic restoration of melts extruded through forming tools is well known in the processing of plastics. A number of works, in which models of various degrees of complexity used to estimate this phenomenon quantitatively are discussed, are devoted to the description of this phenomenon. However, the use of simplified models gives an approximate estimate that does not correspond to experimental data well enough. More complex models big enough for practical applications are, as a rule, not effective enough. Moreover, no model considers one of the most important operational and technological characteristics: the swelling of polymeric products of complex profiles under the influence of ultrasonic fluctuations. Usually, a description of swelling is limited to extruders shaped like twigs with round cross section or flat sheets. In this respect, a mathematical dependence allowing us to quantitatively define the effect of swelling on polymer melts in channels of complex sections during the use of intensive ultrasonic vibrations is of practical interest. (Examples include PS, PVC.)