4. Discussion
Pressing the conditioned ingredient mix through the pellet dies used in this study caused a 10◦C increase in producttemperature compared to the set conditioning temperature. An increase in product temperature of 6–10◦C using a condi-tioning temperature of 65 and 80◦C and die dimensions of 4.8 × 50.8 mm was reported previously by Skoch et al. (1981).This increase in temperature can be attributed to mechanical friction between the ingredient mix and the die hole surface.Increasing length-to-diameter ratio of the die hole may increase the amount of shear which the ingredient mix receives(Thomas et al., 1997).