Patent ID: 7392667

Claim:
A method for shaping a tubular object made of thermoplastic material, comprising the steps: heating an object up to its softening point; providing an inner shaping tool comprising a shaping surface, said shaping surface comprising an open-pored material having a porosity of 50 μm or less with a permeability of between 10 −11 and 10 −16 m 2 ; providing an outer shaping tool comprising an outer shaping surface, said outer shaping tool shaping surface comprising an open pored material having a porosity of 50 μm or less with a permeability of between 10 −11 and 10 −16 m 2 ; wherein said inner shaping tool shaping surface and said outer shaping tool shaping surface are positioned spaced apart and adjacent each other to hold the object therebetween; conducting a free-flowing pressurized medium through the open-pored material towards the surface of the object to be shaped; introducing the inner shaping tool into the object; and applying the outer shaping tool on to the object in order to shape the same by moving the parts thereof in the direction towards the inner shaping tool.