Extrusion and/or pultrusion device and method

An extrusion- or pultrusion device for forming a profile product made from a viscoelastic material and/or plastically deformable material with elastic property and/or viscoplastic material with elastic property in a production direction, said device comprising:

• a rotating die, extending in a radial direction and a width direction, having two opposite first and second side walls and an outer circumferential surface extending in the width direction therebetween, wherein the rotating die comprises a first side portion in connection to the first side wall and a second side portion in connection to the second side wall and a mid-portion extending between the first and second side portions, and
• a profile definition zone having a longitudinal direction coinciding with the production direction, a height direction and a width direction being perpendicular to the height direction, comprising a through channel comprising a first channel section followed by a second channel section downstream the first channel section with reference to the production direction, wherein the rotating die is rotatable about an axis extending across the production direction and arranged to allow the outer circumferential surface to, while the rotating die rotates, exert a pressure onto a surface of the material when fed through the profile definition zone, wherein;
• the first channel section is circumferentially delimited by one or more walls
• and wherein
• the second channel section is circumferentially delimited by
• the circumferential surface of the rotating die and
• a channel portion comprising
• a counter-bearing opposite the rotating die and
• opposing first and second channel portion side walls between the rotating die and the counter-bearing,
• wherein the first channel section is configured to deform the material into a master profile having a maximum height at a predetermined feeding rate dependent on material and minimum cross-sectional area with a first maximum height in the first channel section when exiting the first channel section,
• wherein the first channel section comprises a wake element having a predetermined height dependent on the elastic property of the material,
• wherein the wake element is positioned in at least the height direction
• wherein the second channel section is configured to further deform the material into a final profile having a minimum height by the rotating die being configured to apply increasing pressure on the master profile against the counter-bearing when the master profile exits the first channel section,
• wherein the rotating die is configured at a minimum distance between the rotating die and the counter-bearing dependent on a maximum allowable pressure applied by the rotating die at the position of that minimum distance, wherein the maximum allowable pressure corresponds to the maximum difference in height of the master profile and the final profile and dependent on pattern in the circumferential surface of the rotating die and dependent on the elastic property of the material and thus difference between the height of the final profile and the profile product due to the elasticity of the material;
• and
• wherein the rotating die is configured to be in direct contact with the viscoelastic material and/or plastically deformable material that is to be formed into the profile product.