Process for the production of holes particularly...

Details Process for the production of holes particularly... Process for the production of holes particularly...

2005-08-02

2005-08-02

Lechert, Jr., Stephen J. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Direct application of electrical or wave energy to work

Producing or treating porous product

C264S413000, C264S029100, C264S029500, C264S029700, C264S154000, C264S482000, C264S040100

Reexamination Certificate

active

06923931

ABSTRACT:
A process is described for the production of holes, particularly of micro-perforations, in a composite material, constituted by fibers embedded in a resinous matrix, characterized in that it consists in a preliminary step of carrying out on a specimen of the composite material, with the help of a laser beam, tests consisting in adjusting the duration of illumination at a predetermined place on the specimen, as well as the focusing and power of said laser beam, so as to confine the temperature in the mass of the material to a range of temperatures both greater than the thermal decomposition temperature of the matrix resin and below the temperature of altering the physical properties of the fibers, so as to carry out the elimination of the resin without affecting the physical integrity of the fibers, then in reproducing on the material (8) to be treated, at each position of a perforation to be made, the operating conditions of the laser (10, 12) so as to constitute in said material a through passage, as a result of only the local burning of the resin of the matrix of the composite material.

REFERENCES:
patent: 5741456 (1998-04-01), Ayrton
patent: 6027786 (2000-02-01), Ford
patent: 6294125 (2001-09-01), Bridgewater et al.
patent: 0 314 353 (1999-05-01), None

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