Apparatus for forming and packaging unstable products

A filling head for receiving pressurized supplies of an aqueous surfactant and a foaming agent, for intimately mixing said aqueous surfactant and said foaming agent and for ejecting said mixture in a still liquid form into a suitable container for the dispensing thereof, said mixture thereafter forming a delayed foaming gel in said container, said filling head comprising;

• a housing member having a longitudinal wall, a longitudinal bore, and a first port through said longitudinal wall to said longitudinal bore,
• a spool assembly disposed in said bore of said housing member, said spool assembly being translatable within said bore between a nonfilling position and a filling position, said spool assembly having a throughgoing channel, a longitudinal wall and a second port through the longitudinal wall of said spool assembly to said throughgoing channel, said throughgoing channel having a downstream end, and
• said first and second ports being offset from one another and not in fluid communication when said spool assembly is in said nonfilling position and being aligned with one another and in fluid communication when said spool assembly is in said filling position,
• static mixer means disposed within said filling head for intimately mixing said aqueous surfactant and said foaming agent;
• metering means for introducing metered dosages of said pressurized aqueous surfactant into said throughgoing channel;
• first valve means for establishing and interrupting the flow of said pressurized foaming agent into said throughgoing channel, said first valve means being located upstream of said static mixer means;
• and
• second valve means located downstream of said static mixer for selectively opening the downstream end of said channel in response to the correct positioning of a container to be filled with said mixture.