Abstract: The invention concerns an impregnation method for producing in particular a composite material comprising a fiber or filament array and a continuous matrix, rigid or flexible, with which said array is in close contact. The method is characterized in that said matrix is incorporated in said array in powder form before being transformed to constitute the continuous matrix. It consists in placing the powder and said fiber or filament in an electrostatic field with an alternating current voltage of at least 20 kV for at least 5 s.

Abstract: The thermo-bonding interlining is a nonwoven covered on one face with dots of thermo-bonding resin. According to the invention, the nonwoven is a web, containing no binder or thermo-fusible fibers, whose weight per square meter is between 50 and 150 g, and which is produced from filaments in a thermoplastic material, such as polyester; the mean diameter of the filaments is between 3 and 5 .mu.m, and preferably 90% of the filaments have a diameter comprised between that range; intermingling of the filaments is obtained by streams of high pressure fluid, such as streams of water at pressures of 40 to 80 bars.