Self-wiping multiple screw element mixer

Details Self-wiping multiple screw element mixer Self-wiping multiple screw element mixer

B - Operations, Transporting

01

F

259/52

B01F 7/24 (2006.01)

Patent

CA 1130796

ABSTRACT OF THE DISCLOSURE An improved mixing apparatus involves a vessel having an interior surface in the shape Or at least two intersecting conical frustums with axes parallel and sub- stantially vertical. At least two interengaging helical screw elements are rotatably mounted within the vessel such that when co-rotated they interengage along their length and also conform to the interior surface of the vessel to effect a complete cleaning of each other and of the interior surface of the vessel. The bottom portion of the screw elements form a pressure generating zone and the upper portion Or the screw elements form a mixing zone having a hollow centre described by the co-rotating screw elements. In the mixing zone each screw element includes a continuous transition from a multilobal cross-section, e.g. trilobal cross-section (bounded by 3 equal arcs), to a circular cross-section. The circular cross-section, of the screw elements in the upper part of the mixing zone i.e. above the liquid level, provide greater screw element- to-screw element shear than do the multilobal cross-sections of the screw elements according to the prior art. The mixing apparatus is useful, for example for finishing high viscosity synthetic polymers such as polyamides polyesters, etc.

344594

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