Method for coloring wood chips using a screw conveyor

Details Method for coloring wood chips using a screw conveyor Method for coloring wood chips using a screw conveyor

1992-12-29

1994-05-03

Owens, Terry J.

Coating processes

Particles, flakes, or granules coated or encapsulated

427242, 427440, 118303, 118417, B05D 706

Patent

active

053086538

ABSTRACT:
Comminuted wood is converted to a colored wood product useful as a mulch by feeding the comminuted wood into the lower end of an angularly upward positioned screw conveyor having an internal auger. The comminuted wood is contacted in the lower end of the conveyor by a liquid color-imparting agent, preferably an aqueous solution containing iron oxide pigment, carbon black pigment or a mixture of both pigments. After contacting, rotation of the auger draws the moist colored wood product towards the upper end, permitting runoff of excess liquid agent, which returns by gravity to the basin for further contacting with newly-fed comminuted wood. Colored wood product discharges through a chute at the upper end of the conveyor for further drying, if necessary.

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patent: 4987850 (1991-01-01), McCracken
patent: 5116634 (1992-05-01), Havens et al.

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