PROPELLER FOR A DIGESTION TANK MIXER

The invention relates to a propeller for a digestion tank mixer. Each blade (6) of the propeller (4) has an outer geometrical plane that is parallel to a center axis (A), perpendicular to a radius of the propeller (4) and intersects both a leading edge (11) and a trailing edge (12) of the blade (6), and an inner geometrical plane that is parallel to the outer geometrical plane and that is tangent to the hub (5). The propeller is characterized in that at each intermediate geometrical plane (Y) the blade (6) has an arc-shaped cross section that extends between the leading edge (11) and the trailing edge (12), and a chord (13) that extends between the leading edge (11) and the trailing edge (12), wherein an angle (α) between the chord (13) and a radial plane of the propeller (4), is equal to or greater than 25 degrees and equal to or less than 45 degrees in each intermediate geometrical plane (Y), and wherein the ratio between an arc-height [AH] between the chord (13) and the thrust side surface (7) and the length of the chord [C], AH:C, is equal to or greater than 0,08 and equal to or less than 0,15 in each intermediate geometrical plane (Y).