Air leaks in a vacuum bag are detected using a leak detection film covering the inside face of the bag. The film includes a gas permeable binder carrying oxygen sensitive material that changes in physical appearance at the location of an air leak. The film may be adhered to the inside face of the ba
Air leaks in a vacuum bag are detected using a leak detection film covering the inside face of the bag. The film includes a gas permeable binder carrying oxygen sensitive material that changes in physical appearance at the location of an air leak. The film may be adhered to the inside face of the bag or may form a separate membrane that is placed over a layup being molded in the bag. The film may be illuminated with light having a wavelength selected to cause the film to luminesce.
대표청구항▼
1. A device, comprising: a vacuum bag;a film including oxygen sensitive material inside of and extending substantially entirely across the vacuum bag, the oxygen sensitive material changing in physical appearance at the general location of an air leak in the vacuum bag;a pre-form composite part disp
1. A device, comprising: a vacuum bag;a film including oxygen sensitive material inside of and extending substantially entirely across the vacuum bag, the oxygen sensitive material changing in physical appearance at the general location of an air leak in the vacuum bag;a pre-form composite part disposed inside the vacuum bag; anda tool base on which the pre-form composite part is placed. 2. The device of claim 1, wherein the film includes: an oxygen permeable binder, andwherein the oxygen sensitive material is held in the oxygen permeable binder. 3. The device of claim 1, wherein the film is bonded to an inside face of the vacuum bag. 4. The device of claim 1, wherein the film is formed from a flexible polymer. 5. The device of claim 1, wherein the oxygen sensitive material includes light sensitive nanoparticles responsive to light of a predetermined wavelength for emitting light indicating the location of the air leak in the vacuum bag. 6. The device of claim 1, wherein the oxygen sensitive material may be excited by light of a preselected wavelength to luminesce, and the intensity of the luminescence changes due to the presence of oxygen caused by the air leak. 7. The device of claim 6, wherein the film includes a dye for coloring the luminescence produced by the oxygen sensitive material. 8. The device of claim 1, wherein the film is substantially coextensive with the region of the vacuum bag that is subjected to a vacuum. 9. The device of claim 1, wherein the oxygen sensitive material includes pressure sensitive luminophores. 10. The device of claim 1, wherein the parts include a vehicle subassembly. 11. The device of claim 1, wherein the vacuum bag is used to process aircraft subassemblies. 12. A device, comprising: a plurality of vacuum bags, wherein the plurality of vacuum bags comprises a first vacuum bag and a second vacuum bag, the second vacuum bag inside the first vacuum bag;a first film inside of and substantially coextensive with a first area of the first vacuum bag subjected to a vacuum, the first film including a first oxygen permeable binder and a first oxygen sensitive material held in the first oxygen permeable binder, the first oxygen sensitive material having at least one visual characteristic that changes in the presence of oxygen introduced into the first vacuum bag by a first air leak;a second film inside of and substantially coextensive with a second area of the second vacuum bag subjected to a vacuum, the second film including a second oxygen permeable binder and a second oxygen sensitive material held in the second oxygen permeable binder, the second oxygen sensitive material having at least one visual characteristic that changes in the presence of oxygen introduced into the second vacuum bag by a second air leak;a pre-form composite part disposed inside the second vacuum bag; anda tool base on which the pre-form rests. 13. The device of claim 12, wherein the first film includes a first coating formed on an inside face of the first vacuum bag and the second film includes a second coating formed on an inside face of the second vacuum bag. 14. The device of claim 12, wherein the first oxygen sensitive material includes light sensitive nanoparticles responsive to light of a first predetermined wavelength for emitting light indicating the location of the first air leak and the second oxygen sensitive material includes light sensitive nanoparticles responsive to light of a second predetermined wavelength for emitting light indicating the location of the second air leak. 15. The device of claim 12, wherein the first oxygen sensitive material is excited by light of a first preselected wavelength to luminesce, wherein the presence of oxygen caused by the first air leak produces a change in the luminescence, and further wherein the second oxygen sensitive material is excited by light of a second preselected wavelength to luminesce, wherein the presence of oxygen caused by the second air leak produces a change in the luminescence. 16. The device of claim 15, wherein the first film includes a first dye for coloring the luminescence of the first oxygen sensitive material, and wherein the second film includes a second dye for coloring the luminescence of the second oxygen sensitive material. 17. The device of claim 12, wherein the first oxygen sensitive material and the second oxygen sensitive material each includes pressure sensitive luminophores. 18. A method comprising: placing a pre-form composite part on a tool base;placing a device over the pre-form composite part, wherein the device comprises a vacuum bag and a film including an oxygen sensitive material inside of and extending substantially entirely across the vacuum bag, and wherein the oxygen sensitive material is configured to change in physical appearance at a general location of an air leak in the vacuum bag;sealing the vacuum bag against air infiltration;drawing a vacuum in the vacuum bag; anddetecting the air leak in the vacuum bag by detecting the location of a change in physical appearance of the film resulting from air entering the vacuum bag. 19. A device, comprising: a transparent vacuum bag;a seal located beneath the transparent vacuum bag;a film inside of the transparent vacuum bag and disposed adjacent the seal, the film including a gas permeable binder and a gas sensitive material held in the binder, the gas sensitive material having at least one visual characteristic that changes in the presence of gas entering the transparent vacuum bag through a leak in the seal;a pre-form composite part disposed inside the vacuum bag; anda tool base on which the pre-form composite part is placed. 20. The device of claim 19, wherein the film extends substantially entirely across the seal. 21. The device of claim 19, wherein the gas sensitive material includes pressure sensitive luminophores. 22. The device of claim 19, wherein the gas is oxygen. 23. The device of claim 19, wherein the film extends over an area of the bag and includes marginal portions disposed adjacent to the seal.
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