Patent ID: 7288291

Claim:
A method for forming a film on a continuous or endless planar surface, comprising the steps of: moving the continuous or endless planar surface between a row of electrodes and a backing electrode which are located at opposite sides of the continuous or endless planar surface and are at different potentials; supplying pre-charged powdery particles to a feeding nozzle, the feeding nozzle forming an electrode in a position laterally spaced from and between extra electrodes to form the row of substantially in a plane electrodes and blowing the pre-charged particles from the feeding nozzle toward the continuous or endless planar surface and depositing onto the continuous or endless planar surface a layer of the pre-charged powdery particles of average size less than 100 μm containing less than 40wt-% inorganic additives to form a granular layer, wherein the particles are applied to the continuous or endless planar surface by the powder deposition unit utilizing an electric field created by the row of electrodes formed by the feeding nozzle and the extra electrodes; and finishing the granular layer in a calender with at least one heated member contacting the granular layer, to form a first film.