Wood grain extrusions
AssigneePlastibec Inc.
InventorAngelo Sudano
Life of this patent
Estimating the term…
Abstract
The invention is the provision of an elongated imitation wood product or component which has a plastic core and a plastic coating on at least one surface with the coating, which is of two different colours and which has a randomly swirled pattern, giving a realistic appearance of the wood grain of natural wood to the product. The invention further is in the method and equipment for producing such a realistic imitation wood product or component made of plastic.
Claims18
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.
An extrusion process for producing a length of plastic material simulating natural wood, said process comprising coextruding a coloured plastic material containing at least two different colour pellets having different melting temperatures on to at least one surface of an extruded core material wherein the coextruding step comprises:
- providing the coloured plastic material to an extruder comprising a barrel and a feed screw
- advancing the coloured plastic material through the barrel with the feed screw so as to allow flow surges back over parts of the feed screw, and
- passing the coloured plastic material comprising the at least two different colour pellets through an extrusion die passage having a spreading portion and a restricted outlet,
- creating eddy current producing surges of said coloured plastic material as it is deposited on said at least one surface of said core to produce a coating on said core material which said coating has a randomly swirled pattern of coloured material having an appearance of natural wood grain.
Dependencies are inferred from the claim text.