ENGINEERING JOURNAL CHIANG MAI UNIVERSITY

Volume 25, No. 03, Month DECEMBER, Year 2018, Pages 190 - 198

Effect of recycle ratio on die swell ratio of rubber compound in tread extrusion process

Supphachai Nathaphan and Somkieat Watpathomsub

Abstract Download PDF

The objective of this research is to study the effect of recycled rubber compound volumes on die swell ratio of a tread in the extrusion process applying two-factor factorial design without interaction. There are three blocks of recycled rubber compound volumes (0, 20 and 40 percentage). The die swell ratio of each block is measured for each of three extrusion loads (1.720, 1.735 and 1.750 kg/m) by the experiment of a tread extrusion for the tire size 255/65R17 102H. The tread is extruded by single screw extruder and records a weight of tread at 500 millimeters for calculating a die swell ratio of tread. The results of analysis of variance showed that the use of recycled rubber compound influences the die swell ratio of the tread which the die swell ratio have a tendency of decrease when recycled rubber compound volume is used and die swell ratio have a tendency of increase when the extrusion load is high, the manufacturers can use the volume of recycled rubber compound up to 40 percent and the suitable extrusion load, equals 1.720 kg/m, make the die swell ratio of the tread in the specification limits that are 1.60 ± 0.04.

Keywords

Recycled Rubber Compound, Die Swell Ratio, Tread, Experimental Design

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