Method and system for compacting composite part layup utilizing a single release film layer

Patent metadata

Field	Value
Publication number	US-9994008-B2
Application number	US-201414491228-A
Country	US
Kind code	B2
Filing date	Sep 19, 2014
Priority date	Sep 19, 2014
Publication date	Jun 12, 2018
Grant date	Jun 12, 2018

Abstract

System and method for compacting a composite ply layup comprising a forming tool comprising a top surface and a composite ply layup laid up along the top surface of the forming tool. A single release film comprising a top surface and a bottom surface, wherein the bottom surface of the single release film comprises a first non-planar bottom surface. The first non-planar bottom surface placed over a top surface of the composite ply layup. A venting port operatively coupled directly to the top surface of the single release film. A vacuum source operatively coupled to the venting port and configured to generate a vacuum to the single release film, such that the first non-planar bottom surface of the single release film defines a breather path for the vacuum generated by the vacuum source to distribute over the top surface of the composite ply layup.

First claim

The invention claimed is:

1. A system for compacting a composite ply layup, the system comprising:
a vacuum bag assembly comprising:
a forming tool comprising a top surface;
a composite ply layup laid up along the top surface of the forming tool and comprising surface contours; and
a single thermoplastic release film comprising a top surface and a bottom surface;
wherein the bottom surface of the single thermoplastic release film comprises a first non-planar bottom surface and a second non-planar bottom surface,
the second non-planar surface different than the first non-planar bottom surface,
the first non-planar bottom surface and the second non-planar surface placed directly over a top surface of the composite ply layup, wherein the first non-planar bottom surface and the second non-planar surface define a breather path over the composite ply layup, wherein a size, location, and shape of the first non-planar surface and a size, location, and shape of the second non-planar surface are selected depending upon the surface contours of the composite ply layup; and

a venting port operatively coupled directly to the top surface of the single thermoplastic release film of the vacuum bag assembly so as to allow the single thermoplastic release film to compact the composite ply layup without requiring a separate breather layer and a separate vacuum bag.

2. The system according to claim 1 further comprising
a vacuum source operatively coupled to the venting port and configured to generate a vacuum to the single thermoplastic release film,
wherein the breather path provides a path for the vacuum generated by the vacuum source to distribute over the top surface of the composite ply layup.

3. The system according to claim 2 further comprising
a heating source providing heat to the composite ply, wherein the heat is provided at a predetermined temperature.

4. The system of claim 1 , wherein the single thermoplastic release film is selected from the group consisting of polyethylene, ethylene-tetrafluorethylene, polyvinyl fluoride, or polytetrafluorethylenes.

5. The system of claim 1 wherein the first non-planar surface of the single thermoplastic release film comprises an embossed surface.

6. The system of claim 5 wherein the embossed surface comprises a plurality of cavities.

7. The system of claim 5 wherein the embossed surface comprises a uniform pattern of a plurality of cavities.

8. The system of claim 1 wherein the first non-planar surface of the single thermoplastic release film comprises a textured surface.

9. The system of claim 8 wherein the textured surface comprises a plurality of ridges.

10. The system of claim 8 wherein the textured surface comprises a pattern of a plurality of ridges.

11. The system of claim 10 wherein the pattern of the plurality of ridges comprises a uniform pattern.

12. The system of claim 8 wherein the plurality of ridges have a height between about 0.25 inches to about 0.5 inches.

13. The system of claim 8 wherein the textured surface comprises a repeating pattern of a plurality of ridges.

Assignees

• Boeing Co

Inventors

• Coxon Brad
• Willden Kurtis

Classifications

• B29C70/44

  using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding · CPC title

• B32B37/1018 Primary

  using only vacuum · CPC title

• B29C70/54

  Component parts, details or accessories; Auxiliary operations {, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing} · CPC title

• B30B9/22

  using a flexible member, e.g. diaphragm, urged by fluid pressure · CPC title

• B32B2323/04

  Polyethylene · CPC title