Patent ID: 11951669
Assignee: BODO RICHTER
Field: Other special machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 7:
8. A machine for producing at least a single-walled tubular body from thermoplastic material,
in which at least one tubular preform is output from the nozzle head of an extrusion device,
the at least one tubular preform is guided vertically downwards,
the at least two-part hollow mold having one of a corrugated profile or a cup profile is arranged around the at least one tubular preform,
the at least one tubular preform is expanded in an expansion process by an expanding mandrel having one of corrugated expanding elements or expanding elements provided with cups, the expanding mandrel being arranged centrically to the nozzle head to a predefined dimension in a transverse direction and to a predefined shape, wherein the at least one tubular preform is pressed against one of a corrugated profile or a cup profile of the hollow mold and the at least one tubular preform adopts the shape of one of the corrugated profile or the cup profile by applying one of a vacuum to the hollow mold or compressed air to the expanding mandrel, the at least one tubular preform remaining open at the top and bottom,
the expanding mandrel moves into a non-expanded state after cooling the at least one tubular preform.