Patent ID: 6923931

Claim:
Process for producing holes ( 4 to 7 ), particularly micro-perforations, in a composite material, constituted by mineral or organic fibers ( 1 , 2 ) embedded in a resinous matrix ( 3 ), characterized in that it consists: in a preliminary step, carrying out tests on a specimen of the composite material to be perforated, with a laser beam directed substantially perpendicularly to the surface of said specimen, said tests consisting in adjusting the duration of illumination at a predetermined position on the specimen, as well as the focusing and the power of said laser beam, so as to confine the temperature within the mass of the composite material to a range of temperatures both greater than the thermal decomposition material of the resin matrix ( 3 ) and below the temperature of changing the physical properties of the fibers ( 1 , 2 ), so as to carry out the elimination of the resin without affecting the physical integrity of the fibers, then, in reproducing on the material to be treated, at each position of a hole or perforation to be produced, the conditions of operation of the laser ( 10 , 12 ) so as to constitute in said material, at said position, a through-hole or passage, resulting from only local burning of the resin of the matrix of the composite material.