Abstract
Using wood in extruding profiles is not new, but wood fibers developed from a filler to being the main material, opening new possibilities and allowing new properties of the finished product. Compounds with 70% to 90% wood fibers can be extruded. Wood fibers are now the primary constituent in the material, and plastics are only added to ensure adequate processability. This new technology have succeeded with using conical twin screw extruder/development of spacial screw type for wood extrusion/development of special tooling for wood extrusion. These wood fiber products offer decisive advantages for new materials and are capable of tapping segments which in the past were covered exclusively by conventional materials such as solid wood or MDF boards. Also, this technology is paid attention for recycling technologies in Japan. The market for such products might increase for social demmands. And extrusion with other natural fiber materials is possible.
