Patent ID: 8197733
Filing Date: 2012-06-12
Classification: B05C,B29C,B29K,B29L,B32B,B44F,Y10T

Abstract:
1. A process for producing a length of plastic material imitating natural wood, said process comprising extruding a core of plastic material and coextruding a coating of plastic material containing at least two different colour pellets having different melting temperatures, on at least one surface of said core, the coextruding step comprising: providing the plastic material containing the at least two different colour pellets to an extruder comprising a barrel and a feed screw, advancing the plastic material containing the at least two different colour pellets through the barrel with the feed screw so as to allow flow surges back over parts of the feed screw, and passing the plastic material containing the at least two different colour pellets through an extrusion die passage having a spreading portion and a restricted outlet, causing said coating material to produce a randomly swirled coloured pattern as it is deposited on said at least one surface of said core to give said at least one surface an appearance of wood grain of natural wood.