Mechanical Properties of ( Aloe v era L. ) Leaf for Designing Gel Extraction Machines

Abstract

Compressive and shear properties of ( Aloe v era L. ) leaves were investigated for gel extraction. This information is useful in the design of processing equipment and improving gel production lines in order to decrease losses and enhance product quality. Eff ects of loading speed (10, 50, and 100 mm min - 1 ), temperature (20, 40, and 60 ̊C), and diameter of the cylindrical loading head (70, 140, and 210 mm) on the leaf compression properties, as well as the effect of loading speed on the shear properties were exa mined. The results showed that increasing the temperature would decrease the modulus of elasticity. Loading head diameters had a significant effect on the required force for crushing the leaves and extracting the gel. Based on the results, the best loading combination for extracting Aloe v era gel from the leaf is 20 ̊C temperature, loading head diameter of 14 cm, and loading speed of 100 mm min - 1 . Shear forces of upper and lower leaf surfaces increased with loading speed. However, speed of loading had no eff ect on the shear forces at the edges and center of the leaf. The shear force was similar at different speeds for edge and center regions as well as for upper and lower surfaces of the leaf. Two gel extraction machines were developed based on the shear and compression properties of Aloe v era leaves. Keywords: Compression test, Modulus of elasticity, Processing equipment, Shear test