| 摘要 |
Generally there is provided a nozzle assembly including an outer cylindrical casing member and an inner cylindrical selection member. Inlets are provided along the casing and corresponding openings are provided in the selection member such that they may be selectively aligned with the casing inlets. The internal portion of the cylindrical selection member functions as a film forming chamber where films are developed on the surface for mixing contact. Programmable pulsing pumps connected to the inlets are sequentially operated to inject constituents into the mixing chamber in the desired order and quantity. Air pressure is periodically injected to clear the chamber of mixed constituents. With this programmable apparatus foam density and reaction time are variable during operation. . ;
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