Patent attributes
A vacuum forming machine and a method of manufacturing a duplex twin-sheet element from two continuous webs of thermoplastic material conveyed in parallel by means of a twin-sheet frame provided therebetween, which is adapted to be loaded by means of a tensioning frame for creating closed machine chambers with the material web sections to be shaped, provides for the aspect that the twin-sheet frame is provided with a front frame section in the front along the conveying direction of said material webs, which frame section can be removed for de-moulding said twin-sheet element. The material webs are conveyed in a cycled operation when the twin-sheet frame is not loaded and open in the conveying direction, and for forming a twin-sheet element, the twin-sheet frame is closed and loaded by the tensioning frame.
