Coating processes – Particles – flakes – or granules coated or encapsulated
Patent
1991-08-23
1993-03-09
Beck, Shrive
Coating processes
Particles, flakes, or granules coated or encapsulated
427440, 118417, 118426, 118429, 118693, 47 9, B05D 706
Patent
active
051925877
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 a basin 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. The liquid level in the basin is monitored and additional liquid agent is blended from water and pigment concentrate to maintain the level in the basin. Colored wood product discharges through a chute at the upper end of the conveyor for further drying, if necessary.
REFERENCES:
patent: 4067140 (1978-01-01), Thomas
patent: 4337720 (1982-07-01), Hager
patent: 4491504 (1985-01-01), Engall
patent: 4788790 (1988-12-01), Zeager
patent: 4932156 (1990-06-01), Underwood
Mulch Producers Use of Mulch Colorants The Becker-Underwood Company Mar. 1991 pp. 1-6.
Beck Shrive
Kurtz Bros., Inc.
Owens Terry J.
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