METHOD OF PRODUCING A HOLLOW BODY FROM THERMOPLASTIC MATERIAL

摘要

The invention relates to a method for producing hollow bodies from thermoplastic material comprising the shaping of at least one tubular preform or at least two two-dimensional, web-like preforms of plasticated thermoplastic material into a substantially closed hollow body, for example in the form of a fuel tank for motor vehicles.

主权项

1. A method for producing a hollow body from thermoplastic material, comprising the following method steps:
providing at least one preform of thermoplastic material on a multipart blow molding tool, introducing the preform into cavities of the blow molding tool, molding the preform into shells, joining at least one insert to at least one shell within the blow molding tool, the insert defining a part-volume that is closed off with respect to a main volume of the hollow body to be produced, joining together the shells by closing the blow molding tool and applying pressure to the main volume enclosed by the hollow body, wherein a pressure equalization with the part-volume is brought about parallel to the application of pressure to the main volume.