Patent ID: 6197368
Filing Date: 2001-03-06
Classification: B05C,B05D

Abstract:
In a particulate coating apparatus wherein the top surface of a moving web has preapplied zones of adhesive covering parts of the top surface of the web and has particles delivered from a particle supply to the top surface of the web in a quantity at least enough to cover the zones of adhesive so that the particles adhere to the adhesive zones on the web and do not adhere to portions of the web without adhesive, the improvement comprising:a trough formed in the moving web between input and output rollers over which the web moves, with the trough located on a part of the web which has particles on it, the trough including an input path where the web moves down into the trough after moving over the input roller and an output path where the web moves up and out of the trough before moving over the output roller, with the input path and the output path connected by a trough bottom, and with the input and output paths oriented so that particles not attached to adhesive zones fall from the input path and the output path into the bottom of the trough where the unattached particles contact and adhere to the adhesive zones on the web as the adhesive zones move through the trough.