Patent ID: 7878704

Claim:
Automated method for mixing at least two viscous substances by means of a double-chamber mixing device comprising: a first tank and a second tank, that are cylindrical, coaxial and communicating, each sealingly closed at a first end with a moving piston and provided at its second end with a slightly tapered bottom, both tanks being positioned in mirror-image symmetry relative to a median plane that is perpendicular to their common axis; a central static mixing element connecting both tanks at the level of their slightly tapered bottoms; and a hydraulic device for automatically activating the pistons according to a coordinated reciprocal motion, wherein: the substances to be mixed are injected into the first tank or into the central static mixing element by sealed worm screw injection; a specified number of successive mixing cycles are achieved by pumping, said number being between 5 and 10 and the duration of each cycle being about 30 seconds, from the first tank towards the second tank through the central static mixer, and vice versa; and the final mixture is transferred to one of both tanks, which is then emptied.