Patent ID: 6558754
Filing Date: 2003-05-06
Classification: B24D,B32B,B44C,D21H

Abstract:
Apparatus for even distribution of particles having an average size of 20-150 &mgr;m, the particles being selected from the group consisting of aluminum oxide, silicon carbide and silica, to the surface of a continuously fed paper web impregnated with a liquid thermosetting resin composition, the resin being wet at the distribution of the particles, the apparatus including a feed hopper containing the particles, the hopper having an outlet extending transversely of said fed paper web, a rotating doctor roll placed under the feed hopper and being in communication with said outlet for reception of particles therefrom, said doctor roll being spaced from and in substantially parallel relation to said paper web fed under the doctor roll, and a means for releasing the particles from the doctor roll and distributing them evenly on the fed paper web, wherein said means comprises an electrode arrangement placed between the feed hopper and a downwardly directed vertical tangent of the doctor roll, wherein the electrode arrangement is enclosed by a casing provided with a downwardly directed sliding plate, whereby the particles are lifted from the doctor roll and fluidized by means of an electric field between the electrode arrangement and the doctor roll resulting in an even distribution of particles falling down on the paper web fed under the doctor-roll.