Spraylat Corporation, Inc.

Don Hughes

Steven M Ladatto

Gareth Seatherton

A mixing system employing a rotary blade mixing assembly designed to mix liquid-like, resinous powders with a particulate tinting agent or other additive to produce a uniform, homogeneous powder is disclosed. The mixing system includes a mixing container that may be inverted up to 180&deg; and includes a rotary blade mixing assembly having at least two sets of mixing blades connected to a central shaft and arranged in parallel planes, each set having at least two mixing blades which are connected to the central shaft. Each blade is pitched at an angle to about 20&deg; to about 45&deg; from horizontal as measured following a 180&deg; inversion of the mixing container. Use of the method of the invention is advantageous when uniform color of the final coating powder is desired. The method comprises utilizing the above-mentioned mixing container to hold at least two powders, placing a mixing head containing the above-mentioned rotary blade mixing assembly in the container in sealed relationship, inverting the mixing container while commencing rotation of the mixing blades, and mixing the powders with a blade tip speed of from about 1,000 ft/min to about 5,000 ft/min to cause the powders to be lifted along the container side walls and fall down a central portion of the container. The mixing container is then returned to its original position.

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Nocona, TX, United States of America

Don Hughes