Abstract: In an air-operated plural component mixing and dispensing assembly, including a sliding mixing and dispensing element that forms, with a pair of component inlet blocks, the valves controlling the mixing and dispensing of the plural component materials, the mixing and dispensing element includes a rearward part and a forward part which together form a mixing chamber, with admission passages for the plural components to be mixed in the rearward part and a dispensing orifice for mixed plural component material in the forward part, also including a shaping air assembly with an air inlet, a nozzle air manifold with internal air passageways to one or more impinging air outlets, wherein the shaping air assembly is configured to shape the spray pattern of the dispensed plural component material hydrostatically.

Abstract: An apparatus for preparing a liquid material containing microbubbles includes a dispensing nozzle and a first positive displacement gas pump. The dispensing nozzles includes a material mixing channel, a rotary gas diffuser positioned in the material mixing channel, and a rotary mixer positioned in the material mixing channel downstream of the rotary gas diffuser. The rotary gas diffuser and the rotary mixer rotate about a common axis of rotation. The first positive displacement pump has a first gas outlet opening to the material mixing channel, which is directed at an outer circumference of the rotary gas diffuser.