Self cleaning apparatus for preparing aqueous air foams.

摘要

An apparatus for preparing a water-based air foam includes a mixing chamber (16) for mixing two liquid components, and a nozzle (18) which sprays the mixed liquid components toward a pair of screens (36, 38) within a compartment to produce a foam material. A portion of the first liquid component is diverted upstream of the mixing chamber and is sprayed by three nozzles (66) into the compartment (24) to continuously wash away pre-gelled materials which might otherwise accumulate on a side wall surrounding the compartment.