Methods of forming composite structures and methods of forming material with a removable backing for composite structures

Patent metadata

Field	Value
Publication number	US-10059044-B2
Application number	US-201514679341-A
Country	US
Kind code	B2
Filing date	Apr 6, 2015
Priority date	Feb 5, 2010
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

A method of preparing pre-impregnated (pre-preg) material is provided. The method comprises treating a first surface of a backing with a corona discharge to enhance surface adhesion and applying the pre-preg material to the treated surface of the backing to form a pre-preg material with backing.

First claim

What is claimed is:

1. A method of forming a composite structure comprising:
applying sections of a feedstock comprising fibers and an adhesive material to a removable backing material to form a sheet of fiber-reinforced material having a desired fiber orientation relative to a side of the sheet of fiber-reinforced material, the desired fiber orientation comprising a non-zero degree angle fiber orientation;
applying the sheet of fiber-reinforced material having the desired fiber orientation to at least one surface of a tool to form a fiber-reinforced material having a desired shape while the removable backing material remains applied to the feedstock;
after applying the sheet of fiber-reinforced material having the desired fiber orientation to the at least one surface of the tool with the removable backing material remaining on the feedstock, subsequently removing the removable backing material from the fiber-reinforced material having the desired shape; and
curing the fiber-reinforced material having the desired shape.

2. The method of claim 1 , wherein applying sections of a feedstock comprising fibers and an adhesive material to a removable backing material comprises applying the sections of the feedstock to at least one of a corona discharge treated backing material and a plasma treated backing material.

3. The method of claim 2 , further comprising exposing the removable backing material to a surface energy level selected based on a material used as the removable backing material.

4. The method of claim 1 , wherein applying sections of a feedstock comprising fibers and an adhesive material to a removable backing material comprises applying the sections of the feedstock to an activated surface of the removable backing material.

5. The method of claim 4 , wherein applying the sections of the feedstock to an activated surface of a removable backing material comprises removing air between the sections of the feedstock and the removable backing material.

6. The method of claim 1 , wherein applying the sheet of fiber-reinforced material having the desired fiber orientation to at least one surface of a tool to form a fiber-reinforced material having a desired shape while the removable backing material remains applied to the feedstock comprises stretching the sheet of fiber-reinforced material having the desired fiber orientation and the removable backing material over the tool.

7. The method of claim 1 , further comprising applying additional sheets of fiber-reinforced material having the desired fiber orientation to form the fiber-reinforced material having the desired shape.

8. The method of claim 1 , wherein the removable backing material is stretchable.

9. A method of forming a composite structure comprising:
positioning a sheet of fiber-reinforced material with a removable backing material on at least one forming surface of a tool, the sheet of fiber-reinforced material with the removable backing material comprising sections of a feedstock comprising fibers and having a fiber orientation relative to a side of the sheet of fiber-reinforced of a non-zero degree angle fiber orientation applied to a first surface of the removable backing material;
forcing the sheet of fiber-reinforced material with the removable backing material onto the at least one forming surface of the tool by pressing a second surface of the removable backing material to form the sheet of fiber-reinforced material with the removable backing material into a desired shape;
after forcing the sheet of fiber-reinforced material with the removable backing material onto the at least one forming surface of the tool with the removable backing material remaining on the feedstock, subsequently removing the removable backing material from the sheet of fiber-reinforced material after the sheet of fiber-reinforced material is shaped; and
curing the sheet of fiber-reinforced material.

10. The method of claim 9 , further comprising selecting the first surface of the removable backing material to exhibit an enhanced surface adhesiveness relative to the second surface of the removable backing material.

11. The method of claim 9 , further comprising forcing another sheet of fiber-reinforced material onto the sheet of fiber-reinforced material on the at least one forming surface of the tool by pressing a second surface of another removable backing material of the another sheet of fiber-reinforced material to form the another sheet of fiber-reinforced material into the desired shape.

12. A method of forming a sheet of pre-preg material with a removable backing for a composite structure, the method comprising:
orienting a feedstock comprising a resin and fibers at a desired fiber orientation relative to a lateral side of a removable backing comprising a non-zero degree angle fiber orientation, the removable backing comprising oxygen molecules in atomic form bonded to molecules in the surface of the removable backing to exhibit an enhanced surface adhesion on the surface of the removable backing relative an opposing surface of the removable backing; and
applying sections of the feedstock to a surface of the removable backing to form a sheet of pre-preg material including the fibers at the desired fiber orientation relative to the lateral side of the removable backing.

13. The method of claim 12 , further comprising selecting the removable backing to exhibit an enhanced surface adhesion relative to an opposing surface of the removable backing.

14. The method of claim 1 , further comprising bonding oxygen molecules in atomic form to molecules in a surface of the removable backing material to exhibit an enhanced surface adhesion on the surface of the removable backing material relative an opposing surface of the removable backing material.

15. The method of claim 1 , wherein the sheet of fiber-reinforced material comprises a pre-preg material having the fibers held together with resin.

16. A method of forming a composite structure comprising:
applying sections of a feedstock comprising fibers and an adhesive material to a removable backing material to form a sheet of fiber-reinforced material having a desired fiber orientation relative to a side of the sheet of fiber-reinforced material, the desired fiber orientation comprising a non-zero degree angle fiber orientation;
applying the sheet of fiber-reinforced material having the desired fiber orientation to at least one surface of a tool to form a fiber-reinforced material having a desired shape while the removable backing material remains applied to the feedstock;
stretching the sheet of fiber-reinforced material including the removable backing material over the tool; and
after applying the sheet of fiber-reinforced material having the desired fiber orientation to the at least one surface of the tool with the removable backing material remaining on the feedstock, subsequently removing the removable backing material from the fiber-reinforced material having the desired shape.

17. The method of claim 9 , further comprising stretching the sheet of fiber-reinforced material including the removable backing material over the tool.

18. The method of claim 9 , further comprising stretching the removable backing material over the tool.

19. The method of claim 9 , further comprising selecting the sheet of fiber-reinforced material to comprise a dry fiber material.

Assignees

• Orbital Atk Inc
• Northrop Grumman Innovation Systems Inc

Inventors

• Turner Peter G

Classifications

• B32B38/0008

  Electrical discharge treatment, e.g. corona, plasma treatment; wave energy or particle radiation (heat treatment B32B38/0036) · CPC title

• B29C66/028

  Non-mechanical surface pre-treatments, i.e. by flame treatment, electric discharge treatment, plasma treatment, wave energy or particle radiation (B29C65/14 takes precedence; non-mechanical surface treatment of plastics in general B29C59/08 - B29C59/16) · CPC title

• Y10T156/108

  Flash, trim or excess removal · CPC title

• B29C37/0075

  using release sheets · CPC title

• B32B2309/68

  Vacuum · CPC title