Patent ID: 8168104

Claim:
A method of manufacturing a surface-treated wood plastic composite panel, comprising: (a) mixing a synthetic resin matrix and wood fibers to uniformly disperse the wood fibers into the synthetic resin matrix and form a wood resin complex; (b) extruding and then cooling the wood resin complex to form a wood plastic composite panel; (c) preheating the wood plastic composite panel to a predetermined temperature to prevent surface deterioration and deformation during subsequent embossing; (d) embossing a structure to a predetermined depth, the embossed structure corresponding to a grain pattern of a cut-open surface of natural lumber on a surface of the preheated wood plastic composite panel; (e) cooling the embossed wood plastic composite panel; and (f) brushing the embossed surface of the cooled wood plastic composite panel to remove a portion of the synthetic resin from the embossed surface and to form a linear micro concavo-convex structure to a predetermined depth, the linear micro concavo-convex structure being parallel to the grain pattern of the embossed structure, wherein the embossed structure formed by the embossing process has an average depth of 200 to 900 μm and the linear micro concavo-convex structure formed by the brushing process has an average depth of 10 to 500 μm so that the resulting wood plastic composite panel has a reflection rate of 10 to 50% when light is incident on the surface of the panel at an incidence angle of 60 degrees.