Foam producing equipment

A foam producing unit comprising a container, interior wall means defining therein a plurality of side by side chambers, means submerged in a liquid foamable solution for introducing a gas to one of said chambers, under pressure, in a jet-like flow, to enter a small quantity of a liquid foamable solution at the bottom thereof, to cause said solution to form into bubbles which produce a foam rising upwardly through said solution to build up and fill the said one chamber over the level of the liquid therein, means defining laterally directed small bore passages in a portion of said wall means above the level of liquid, said passages communicating said one chamber with an upper part of an adjacent chamber to one side thereof, the said passages being located to limit the movement of foam from said one chamber to said adjacent chamber until the foam is built up, under pressure, in said one chamber, whereupon the bubbles on the foam will be forced to move laterally to said adjacent chamber by way of said small bore passages, the means defining the passages being formed to squeeze and strip liquid from the bubbles passing therethrough and to discharge the resultant bubble structure to enter and build up in said adjacent chamber prior to proceeding to discharge under the head of pressure continued on said foam by the continuing delivery of gas under pressure to said one chamber, said wall means providing a drain surface for return of stripped liquid to the contained quantity of liquid solution.