the invention relates to a method for producing hollow bodies from thermoplastic material in which web - or strip - type preforms of plasticised plastics material are shaped in a multi - part tool which forms a mould nest , with two outer moulds and a central mould which perform opening and closing movements with respect to one another . the central mould is provided with at least one device for receiving and manipulating components to be fastened in the interior of the hollow body by means of a material and / or form - fitting joint . prior to the fastening of the components to the inner wall of the hollow body to be produced , the components are heated by means of a radiant heating device . the radiant heating device is advantageously integrated in the central mould of the tool .