method and device for wegtrennung of foreign material from the maschinenkreislauf a beschichtungsmischung in a streichanlage

摘要

The present invention relates to a method and assembly for separating foreign material from coating mix flow circulating in the machine circulation of a coating station (7) in coaters used for coating paper and board. According to the method, 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 said tank (1). The coating mix flow incoming from said tank (1) to the coating station is screened by means of at least one pressure screen (5) and the rejects fraction of the coating mix flow is discharged from said pressure screen (5). A portion of the coating mix flow circulating in the machine circulation is passed via a vibrating screen (13) and the accepts fraction of the vibrating screen is returned back to the machine circulation. The method offers high efficiency in the removal of elongated foreign matter particles from the machine circulation of coating mix. IMAGE