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Polyurethane foaming machine production process and flow, most of the sponge factory production using box-type foam, will be a variety of raw materials in high-speed mixing, rapid addition of forming box, in the forming box, chain growth, foaming, cross-linking, curing and other reactions are completed to complete sponge production. The process has the advantages of short process flow, low viscosity of material, easy control, energy saving, small equipment investment and wide application density range.