Coating processes – With post-treatment of coating or coating material – Coating material recirculation or regeneration
Patent
1998-11-12
2000-06-13
Bareford, Katherine A.
Coating processes
With post-treatment of coating or coating material
Coating material recirculation or regeneration
118603, 118610, B05D 312, B05C 1110
Patent
active
060747005
ABSTRACT:
A method and apparatus for separating foreign material from coating mix flow circulating in the machine circulation of a coating station (7) in coaters used for coating a web of paper or board. Coating mix is conveyed from a tank (1) to a coating station, where it is applied to the surface of the web to be coated, and the excess of the coating mix conveyed to the coating station (7) is returned to the tank (1). The coating mix flow incoming from said tank (1) to the coating station is screened by at least one pressure screen (5) and the rejects fraction of the coating mix flow is discharged from the pressure screen (5). A portion of the coating mix flow circulating in the machine circulation is passed through a vibrating screen (13) and the accepts fraction of the vibrating screen is returned back to the machine circulation. The invention offers high efficiency in the removal of elongated foreign matter particles from the machine circulation of coating mix.
REFERENCES:
patent: 4102299 (1978-07-01), Wallsten
patent: 5401899 (1995-03-01), Bryant et al.
Bareford Katherine A.
Valmet-Raisio OY
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