Method for making a component unit for heat exchanger

Method for making a component unit for heat exchanger, substance exchanger and/or bioreactor systems, with at least two walls of embossed thermoplastic sheets, comprising:

• issuing a fusible strip from a melt shaping tool on an extruder head, passing the fusible strip through a preliminary cooling run, introducing the fusible strip into a strip molding press after the cooling run, and continuously molding the fusible strip in the strip molding press to form an embossed plastic sheet and cooling the sheet to set it, the extruder head having a slot having a width and which method includes first roughly adjusting a width of the shaped plastic sheet molded in the strip molding press by setting or selecting the width of the slot in the extruder head, and finely adjusting the width of the shaped plastic sheet by applying a tensile force to the fusible strip while being molded, the tensile force being applicable through different velocities of the fusible strip between the extruder head and the strip molding press that follows.