PROCESS FOR THE PRODUCTION OF HOLLOW BODIES OF THERMOPLASTICMATERIAL BY EXTRUSION BLOW MOLDING

摘要

The invention relates to a method for producing hollow bodies from thermo plastic material by extrusion blow moulding. In the method according to the invention, at least two preforms (6) are continuously extruded in web form f rom plasticated polymer by means of a number of extrusion devices (2). The p reforms are together moulded into a hollow body while still in the plastic s tate, i.e. in the first heat, within a multipart mould (1), forming a mould cavity (4a, 4b). During the extrusion, at least one preform is provided with a wall thickness profile independently of the other preform by continuous d ie gap adjustment during the extrusion.