Claims
- 1. Process for the production of a panel (7) of composite material with stiffening strips (3), in which a mold (1) having the shape and size of the panel to be produced, is draped with at least one first ply (2) of fibers pre-impregnated with resin, there is emplaced at desired positions on said ply (2) at least one stiffening strip (3), the stiffening strip (3) as well as at least a portion of the remaining surface of said first ply (2) is covered with at least one second ply (4) of fibers pre-impregnated with resin, then a bladder (6) is positioned to cover the above elements, a suitable vacuum is drawn in the space between the mold (1) and the bladder (6), the assembly is then disposed in an autoclave to subject it to a pre-established polymerization cycle for the resin, at temperatures and pressures suitable to said resin, and finally, the panel is demolded; the improvement wherein the stiffening strip (3) is a foam structure, and prior to said emplacement of the stiffening strip (3) and/or of the second ply (4), there is interposed at least one layer (5) of a non-adherent material between at least a portion of the surface of the stiffening strip (3) and one and/or the other of said plies (2, 4).
- 2. Process according to claim 1, characterized in that each stiffening strip (3) is totally enclosed by at least one layer (5) of non-adherent material.
- 3. Process according to claim 2., characterized in that each stiffening strip (3) is totally surrounded by said layer (5) and is withdrawn from the panel (7) after demolding.
- 4. Process according to claim 1, characterized in that the layer of composite material constituted by said first ply or plies of pre-impregnated fibers, is subjected to curing before emplacement of said stiffening strips (3) , layer (5) of non-adherent material and second ply or plies.
- 5. Process according to claim 1, characterized in that the non-adherent material (5) is selected from the group consisting of Teflon and compounds of the silicone family.
- 6. Process according to claim 1, characterized in that between the mold (1) and said first ply (2) there is interposed a surfacing film.
- 7. Process according to claim 3, characterized in that the layer of composite material constituted by said first ply or plies of pre-impregnated fibers, is subjected to curing before emplacement of said stiffening strips (3) , layer (5) of non-adherent material and second ply or plies.
- 8. Process according to claim 7, characterized in that the non-adherent material (5) is selected from the group consisting of Teflon and compounds of the silicone family.
- 9. Process for the production of a panel (7) of composite material with stiffening, strips (3), in which a mold (1) having the shape and size of the panel to be produced, is draped with at least one first ply (2) of fibers pre-impregnated with resin, there is emplaced at desired positions on said ply (2) at least one stiffening strip (3), the stiffening strip (3) as well as at least a portion of the remaining surface of said first ply (2) is covered with at least one second ply (4) of fibers pre-impregnated with resin, then a bladder (6) is positioned to cover the above elements, a suitable vacuum is drawn in the space between the mold (1) and the bladder (6), the assembly is then disposed in an autoclave to subject it to a pre-established polymerization cycle for the resin, at temperatures and pressures suitable to said resin, and finally, the panel is demolded; the improvement wherein the stiffening strip (3) is a cellular structure or foam structure, and the plies (2,4) completely surround the stiffening strip (3), and prior to said emplacement of the stiffening strip (3) and/or of the second ply (4), there is interposed at least one layer (5) of a non-adherent material between at least a portion of the surface of the stiffening strip (3) and one and/or the other of said plies (2, 4).
- 10. Process according to claim 9, characterized in that each stiffening strip (3) is totally enclosed by at least one layer (5) of non-adherent material.
- 11. Process according to claim 9, characterized in that the layer of composite material constituted by said first ply or plies of pre-impregnated fibers, is subjected to curing before emplacement of said stiffening strips (3), layer (5) of non-adherent material and second ply or plies.
- 12. Process according to claim 9, characterized in that the non-adherent material (5) is selected from the group consisting of Teflon and compounds of the silicone family.
- 13. Process according to claim 9, characterized in that between the mold (1) and said first ply (2) there is interposed a surfacing film.
- 14. Process according to claim 10, characterized in that the layer of composite material constituted by said first ply or plies of pre-impregnated fibers, is subjected to curing before emplacement of said stiffening strips (3) , layer (5) of non-adherent material and second ply or plies.
- 15. Process according to claim 14, characterized in that the non-adherent material (5) is selected from the group consisting of Teflon and compounds of the silicone family.
Priority Claims (1)
Number |
Date |
Country |
Kind |
00 05798 |
May 2000 |
FR |
|
CROSS REFERENCE TO RELATED APPPLICATIONS
[0001] This application is a division of co-pending application Ser. No. 09/849,533, filed on May 7, 2001, the entire contents of which are hereby incorporated by reference.
Divisions (1)
|
Number |
Date |
Country |
Parent |
09849533 |
May 2001 |
US |
Child |
10834833 |
Apr 2004 |
US |