Method and system of forming a releasable support and method of pre-cure removal of a composite laminate

Patent metadata

Field	Value
Publication number	US-9586344-B2
Application number	US-201414476332-A
Country	US
Kind code	B2
Filing date	Sep 3, 2014
Priority date	Sep 3, 2014
Publication date	Mar 7, 2017
Grant date	Mar 7, 2017

Abstract

A method and system of preparing a releasable underlying support for use in preparing a composite laminate is presented where a base tool is a covered with a conformable thin sheet on the tooling surface of a base tool, where the thin sheet is configured with one high tack surface side and an opposite side having a non-tack surface in contact with the tooling surface. The non-tack surface side will allow release of laid up pre-cure composite lamina that can then be cured on a separate curing tool. The thin sheet is positioned over the base tool and a vacuum source and sealed around the perimeter edge of the base tool. Drawing a vacuum causes the non-tack surface side of the film to be drawn downward into contact with the tooling surface. Plies of pre-cure lamina can then be added to the base tool covering and adhering to the high tack surface side.

First claim

The invention claimed is:

1. A method of forming a releasable underlying support for use in preparing a composite laminate comprising,
providing a base tool having a tooling surface and a perimeter edge;
placing a conformable thin sheet on the tooling surface, where the thin sheet is configured with one high tack surface side and an opposite side having a non-tack surface that is in contact with the tooling surface;
positioning the thin sheet over a vacuum source;
sealing the thin sheet at or near the perimeter edge of the base tool; and
drawing a vacuum to cause the non-tack surface side of the thin sheet to be drawn downward into contact with the tooling surface.

2. The method of claim 1 further comprising the step of adding a first layer of pre-cure lamina to the high tack surface side to form a composite laminate.

3. The method of claim 2 further comprising the step of adding one or more subsequent layers of pre-cure lamina to the first layer to form a composite laminate.

4. The method of claim 2 further comprising the steps of
stopping the vacuum;
removing the seal from the thin sheet;
removing the composite laminate and attached thin sheet from the base tool; and
removing the thin sheet from the composite laminate.

5. The method of claim 4 where the composite laminate is transferred to a curing tool.

6. The method of claim 5 where the composite laminate and curing tool are placed in a curing device to cure the composite laminate.

7. The method of claim 4 further comprising reusing the thin sheet to prepare a second composite laminate using the base tool.

8. The method of claim 2 further characterized in that the first layer of pre-cure lamina is formed by,
applying a composite pre-preg over a deformable carrier film; and
deforming the composite pre-preg by stretching the deformable carrier film, stretching comprising changing one of a length or a width of the deformable carrier film.

9. The method of claim 8 further characterized in that the deformable carrier film is used to transport and position the composite pre-preg over the high tack surface side of the thin sheet.

10. The method of claim 9 further comprising removing the deformable carrier film before adding a second layer of pre-cure lamina to the first layer.

11. The method of claim 8 , wherein the composite pre-preg is placed on the deformable carrier film so as to leave one or more edge margins on the deformable carrier film around the composite pre-preg.

12. A method of forming a composite laminate comprising,
providing a base tool having a tooling surface and a perimeter edge;
placing a conformable thin sheet on the tooling surface, where the thin sheet includes a latex layer, the thin sheet configured with one high tack surface side and an opposite side having a non-tack surface in contact with the tooling surface;
positioning the thin sheet over a vacuum source;
sealing the thin sheet at or near the perimeter edge of the tool; and
drawing a vacuum to cause the non-tack surface side of the sheet to be drawn downward into contact with the tooling surface.

13. The method of claim 12 including the further steps of:
adding a first layer of pre-cure lamina to the high tack surface side;
adding one or more subsequent layers of pre-cure lamina to the first layer to form a composite laminate;
stopping the vacuum;
removing the seal from the thin sheet;
removing the composite laminate and attached thin sheet from the base tool; and
removing the thin sheet from the composite laminate.

14. The method of claim 13 where the composite laminate is transferred to a curing tool.

15. The method of claim 14 where the composite laminate and curing tool are placed in a curing device to cure the composite laminate.

16. The method of claim 13 further characterized in that the first layer of pre-cure lamina is formed by,
applying a composite pre-preg over a deformable carrier film; and
deforming the composite pre-preg by stretching the deformable carrier film, stretching comprising changing one of a length or a width of the deformable carrier film.

17. The method of claim 16 further characterized in that the deformable carrier film is used to transport and position the composite pre-preg over the high tack surface side of the thin sheet.

18. The method of claim 17 further comprising removing the deformable carrier film before adding a second layer of pre-cure lamina to the first layer.

19. The method of claim 16 , wherein the composite pre-preg is placed on the deformable carrier film so as to leave one or more edge margins on the deformable carrier film around the composite pre-preg.

20. The method of claim 19 wherein the one or more edge margins facilitate at least one of handling of the deformable carrier film and attachment of hardware or equipment to the deformable carrier film.

21. The method of claim 16 , wherein deforming the composite pre-preg includes stretching the deformable carrier film in a direction traverse to an orientation of fibers in the composite pre-preg.

22. The method of claim 12 further comprising reusing the thin sheet to prepare a second composite laminate using the base tool.

Assignees

• Boeing Co

Inventors

• Thomas Charles W
• Flolid Derek J
• Morris John D

Classifications

• B29C33/68 Primary

  Release sheets · CPC title

• B29C70/342

  using isostatic pressure · CPC title

• B29C70/30

  Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core · CPC title

• B29K2105/0872

  Prepregs · CPC title