Apparatus for the manufacture of homogeneous, fine-pored synthetic resin foams

Claim 1

Apparatus for the continuous preparation of a homogeneous, fine-pored, cured, synthetic resin foam with additives therein, said apparatus comprising, in combination, a foaming chamber having an inlet and an oulet spaced from said inlet, at least one nozzle at said inlet for directing materials into said foaming chamber, means containing the synthetic resin and a foaming agent connected to said nozzle and supplying said resin and said agent to said chamber, means for supplying gas under pressure to said inlet, said foaming agent, said gas and said resin foaming a foam-resin mixture without a curing agent for said resin in said foaming chamber, a first mixing chamber with a tubular wall and having a nozzle for directing materials into said mixing chamber, a foam-resin mixture inlet and an outlet spaced from said last-mentioned inlet, a circulation hose connected at one end to said outlet of said foaming chamber for receiving said foam-resin mixture from said chamber and connected to said inlet of said mixing chamber for supplying said foam-resin mixture thereto, means connected to said nozzle of said first mixing chamber for supplying a first additive to said nozzle of said first mixing chamber, a second mixing chamber with a tubular wall and having a nozzle for directing materials into said second mixing chamber, an inlet and an outlet spaced from said last-mentioned inlet, interconnecting means interconnecting said outlet of said first mixing chamber to said inlet of said second mixing chamber for supplying said foam-resin mixture with said additive to said second mixing chamber, and means connected to said nozzle of said second mixing chamber for supplying a second additive to said nozzle of said second mixing chamber, each of said first and second chambers being free interiorly thereof of baffle plates, screws and stiffers and one of said means for supplying an additive comprising means containing a curing agent for said resin and supplying said curing agent to the mixing chamber to which it is connected.