METHOD AND DEVICE FOR IMPREGNATING A FIBROUS WEB WITH A POWDER USING AN ALTERNATING ELECTROSTATIC FIELD

摘要

Process for electrostatic penetration of a powder to the interior of a fibrous, filamental and/or porous network to form composite material comprising a continuous rigid or flexible matrix. The powder and network are placed between lower and upper electrodes which are connected to poles of an AC generator. The upper electrode comprises a tube and the applied electrostatic field is 0.10 - 20kV/mm. - Process for electrostatic penetration of a powder to the interior of a fibrous, filamental and/or porous network to form composite material comprising a continuous rigid or flexible matrix. The powder and network are placed between lower and upper electrodes which are electrically insulated from each other by a dielectric and connected to poles of an AC generator. The upper electrode comprises a tube and the applied electrostatic field is 20kV/mm