Described are co-extruded mouldings and a co-extrusion process for making decorative mouldings having a simulated wood appearance. The process includes mixing a base material and colour particles, heating and displacing the mixture using a feed screw so the colour particles move helically along the trajectory of the feed screw while avoiding backflow and melting to thereby create corresponding helical vein segments, forcing the mixture through a tubular channel while controlling heat and shear conditions, feeding the mixture into a die to flatten and widen the mixture to produce a planar surface coating at the die outlet so the helical vein segments are transposed into two- dimensional nested arches simulating wood appearance; and co-extruding the surface coating onto a cellular polymer core. The process enables improved simulated wood appearance in an efficient manner.
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