Process for the production of a molding by structural foam molding, - in which a plastics melt is provided by melting of a thermoplastic, - in which the plastics melt is loaded with a blowing agent, and - in which the plastics melt loaded with the blowing agent is injected under pressure into a cavity of a mold in such a way that the plastics melt fills the cavity behind a melt front proceeding through the cavity, where - the injection velocity at which the plastics melt is injected into the cavity of the mold is adjusted in such a way that, in a region that follows a section of the melt front with a chronological separation of at most 0.15 s, at least at one juncture during the injection procedure, the internal pressure of the plastics melt in the cavity is greater than the critical pressure of the blowing agent, • characterized in that the plastics melt in the cavity comprises, in addition to the region, a further region where, in this further region, the internal pressure of the plastics melt is lower than the critical pressure of the blowing agent, • where this further region is delimited frontally in the direction of flow of the plastics melt by the melt front and retrally in the direction of flow of the plastics melt by the region, and • where the plastics melt loaded with the blowing agent foams during the injection procedure. - in which a plastics melt is provided by melting of a thermoplastic, - in which the plastics melt is loaded with a blowing agent, and - in which the plastics melt loaded with the blowing agent is injected under pressure into a cavity of a mold in such a way that the plastics melt fills the cavity behind a melt front proceeding through the cavity, where - the injection velocity at which the plastics melt is injected into the cavity of the mold is adjusted in such a way that, in a region that follows a section of the melt front with a chronological separation of at most 0.15 s, at least at one juncture during the injection procedure, the internal pressure of the plastics melt in the cavity is greater than the critical pressure of the blowing agent, • characterized in that the plastics melt in the cavity comprises, in addition to the region, a further region where, in this further region, the internal pressure of the plastics melt is lower than the critical pressure of the blowing agent, • where this further region is delimited frontally in the direction of flow of the plastics melt by the melt front and retrally in the direction of flow of the plastics melt by the region, and • where the plastics melt loaded with the blowing agent foams during the injection procedure. • characterized in that the plastics melt in the cavity comprises, in addition to the region, a further region where, in this further region, the internal pressure of the plastics melt is lower than the critical pressure of the blowing agent, • where this further region is delimited frontally in the direction of flow of the plastics melt by the melt front and retrally in the direction of flow of the plastics melt by the region, and • where the plastics melt loaded with the blowing agent foams during the injection procedure. • where this further region is delimited frontally in the direction of flow of the plastics melt by the melt front and retrally in the direction of flow of the plastics melt by the region, and • where the plastics melt loaded with the blowing agent foams during the injection procedure.