the process and device are intended for controlling the molding of a container during the manufacture of containers from a thermoplastic material . at least two previously injection - molded preforms are temperature - treated and delivered in succession to at least one blow station for blow molding of the preforms into containers . in order to compensate for nonuniform temperature distribution in the material of the preforms relative to one another , at least one blow parameter during molding of the preforms into containers is specified in a fashion that differs from one to the next . the differing specification is made in such a manner as to compensate for the nonuniform temperature distribution so that containers with approximately identical spatial distribution of wall material , orientation properties , and crystallization characteristics exist when the blow - molding process is finished .