The influence of feed rate and shear forces on the devulcanization process of ground tire rubber (GTR) conducted in a co-rotating twin screw extruder

K. Formela; M Cysewska; J. Haponiuk; A. Stasiek

Published : 2013-12-30

Vol. 58 No. 11-12 (2013)

The influence of feed rate and shear forces on the devulcanization process of ground tire rubber (GTR) conducted in a co-rotating twin screw extruder

K. Formela M Cysewska J. Haponiuk A. Stasiek

Abstract

The search for new ways to recycling of rubber waste has been the aim of many studies conducted by research centers and companies worldwide. The results of our investigations on the process of continuous thermomechanical devulcanization of ground tire rubber using a twin screw extruder are presented. We used a co-rotating twin screw extruder with a special configuration of plasticizing unit, enabling generation of considerable shear forces. Various properties were characterized, such as the influence of the ground tire rubber feed rate and screw speed (shear forces) on the screw torque, acetone extract, sol fraction, and the degree of devulcanization in the resulting products. The effect of a secondary vulcanization on the vulcametric curves was determined, and the mechanical properties (tensile strength, elongation at break, hardness, resilience and abrasion resistance) of the revulcanized material were studied. It has been determined that the devulcanization process depends on the values of shear force and residence time acting on ground tire rubber. The devulcanization degree increases with increasing screw speed and feed rate. The results of repeatability of continuous devulcanization process of ground tire rubber were also determined. Obtained products possess the quality comparable to that of reclaim rubber available on the market.

Keywords

recycling ; rubber waste ; devulcanization ; twin screw extruder ; revulcanization recykling ; odpady gumowe ; dewulkanizacja ; wytłaczarka dwuślimakowa ; rewulkanizacja

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Formela, K., Cysewska, M., Haponiuk, J., & Stasiek, A. (2013). The influence of feed rate and shear forces on the devulcanization process of ground tire rubber (GTR) conducted in a co-rotating twin screw extruder. Polimery, 58(11-12), 906–912. Retrieved from https://polimery.ichp.vot.pl/index.php/p/article/view/798

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K. Formela kformela@urethan.chem.pg.gda.pl

Affiliation
Gdansk University of Technology, Chemical Faculty, Department of Polymers Technology, G. Narutowicza Street 11/12, 80-233 Gdansk, Poland

M Cysewska

Affiliation
Gdansk University of Technology, Chemical Faculty, Department of Polymers Technology, G. Narutowicza Street 11/12, 80-233 Gdansk, Poland

J. Haponiuk

Affiliation
Gdansk University of Technology, Chemical Faculty, Department of Polymers Technology, G. Narutowicza Street 11/12, 80-233 Gdansk, Poland

A. Stasiek

Affiliation
Institute for Engineering of Polymer Materials & Dyes, M. Sklodowskiej-Curie Street 55, 87-100 Torun, Poland