(57) Mixing elements (11), (12) for a motionless mixer comprise passage tubes (13), (17)
through which fluids flow and helical blades (14), (18) formed in the passage tubes
so as to be integral therewith. The interior of the passage tubes (13), (17) are partitioned
by the blades (14), (18) to form a plurality of fluid passages (15, 16), (19, 20).
The blade extends from one end of the passage tubes (13), (17) to the other in the
longitudinal direction of the passage tube to be twisted helically clockwise (right-handed)
or counterclockwise (left-handed). The corner portions (22) of the fluid passages
are rounded. The end edges (21) of the blade (14), (18) are curved in the direction
of the thickness and rounded. The motionless mixer is formed by alternately and longitudinally
coupling right- and left-handed rotation type mixing elements (11), (12). The mixing
elements (11), (12) are so arranged that the facing end edges of the blades (14),
(18) of each two adjacent mixing elements (11), (12) cross at right angles.
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