Method for fabrication of structure adhesive joints

• US 5,830,308 A
• Filed: 07/18/1996
• Issued: 11/03/1998
• Est. Priority Date: 07/18/1996
• Status: Expired due to Term

• Current Assignee: Composites Intellectual Holdings, Inc.
• Original Assignee: Applied Composites Technology Incorporated
• Inventors: Reichard, Ronnal P.
• Primary Examiner(s): Lorin, Francis J.
• Application Number:
  US08/683,378
• Time in Patent Office: 838 Days
• Field of Search: 156/292, 156/291, 156/290, 156/157, 156/304.1
• US Class Current: 156/291
• CPC Class Codes: B29C 65/483 Reactive adhesives, e.g. chemically curing adhesives
• CPC Class Codes: B29C 65/4835 Heat curing adhesives
• CPC Class Codes: B29C 65/5057 positioned between the surfaces to be joined B29C65/5035 takes precedence
• CPC Class Codes: B29C 65/542 by injection
• CPC Class Codes: B29C 65/7855 Provisory fixing
• CPC Class Codes: B29C 66/1122 Single lap to lap joints, i.e. overlap joints B29C66/45, B29C66/472, B29C66/52272 take precedence
• CPC Class Codes: B29C 66/232 said joint lines being multiple and parallel, i.e. the joint being formed by several parallel joint lines
• CPC Class Codes: B29C 66/24221 being circular B29C66/51 takes precedence
• CPC Class Codes: B29C 66/24244 forming a rectangle
• CPC Class Codes: B29C 66/324 Avoiding burr formation
• CPC Class Codes: B29C 66/3452 Making complete joints by combining partial joints
• CPC Class Codes: B29C 66/43 Joining a relatively small portion of the surface of said articles B29C66/45 takes precedence
• CPC Class Codes: B29C 66/71 characterised by the composition of the plastics material of the parts to be joined welding bar compositions B29C65/125
• CPC Class Codes: B29C 66/721 Fibre-reinforced materials B29C66/729 takes precedence
• CPC Class Codes: B29C 66/7212 characterised by the composition of the fibres
• CPC Class Codes: B29K 2063/00 Use of EP, i.e. epoxy resins or derivatives thereof, as moulding material
• CPC Class Codes: B29K 2077/10 Aromatic polyamides [polyaramides] or derivatives thereof
• CPC Class Codes: B29K 2277/10 Aromatic polyamides [Polyaramides] or derivatives thereof
• CPC Class Codes: B29K 2307/04 Carbon
• CPC Class Codes: B29K 2309/08 Glass

Abstract

A method is disclosed for bonding structural elements together by injecting a liquid adhesive into a flow channel created by two strips of double sided adhesive tape and the two structural elements to be joined. The double sided adhesive tapes hold the structural elements in position while the adhesive is cured, thus forming a permanent bond between the structural elements.

Claims

1. A method for bonding first and second structural elements together comprising:

A) applying a first strip of double sided adhesive tape to a predetermined bonding area of said first structural element;

B) applying a second strip of double sided adhesive tape to a predetermined bonding area of one of said first and second structural elements;

C) placing said second structural element to be bonded on said first structural element so that said first and second strips of double sided adhesive tape form a flow channel between said first and second structural elements;

D) injecting an adhesive into the flow channel until said flow channel has been substantially filled with said adhesive, the first and second strips of double sided adhesive providing the sole means of attachment of said first and second structural elements during injection of adhesive into said flow channel; and

E) allowing the adhesive to cure.

2. The method according to claim 1 wherein at least one of said structural elements is a composite panel.

3. The method according to claim 2 wherein said composite panel is comprised of a fiber reinforced plastic.

4. The method according to claim 1 wherein the thickness of said double sided adhesive tape is varied to control the depth of the flow channel.

5. The method according to claim 1 wherein said double sided adhesive tape has a thickness which is between about 0.05 mm to 10 mm.

6. The method according to claim 1 wherein said double sided adhesive tape is formed from a base material comprised of at least one of polyethylene foam, urethane foam, or acrylic foam.

7. The method according to claim 1 wherein a tape adhesive applied to said double sided adhesive tape is comprised of at least one of a rubber, urethane or acrylic based contact adhesive.

8. The method according to claim 1 comprising the additional step of providing an adhesive injection port in at least one of said first and second structural elements within the boundaries defined by said first and second strips of double sided adhesive tape, said injection port passing through the structural element and permitting the passage of adhesive therethrough and into the flow channel.

9. The method according to claim 8 wherein said adhesive is injected into said flow channel through said adhesive injection port.

10. A method for bonding a plurality of structural elements together comprising:

A) applying a double sided adhesive gasket to a predetermined bonding area of a first structural element so as to define a flow channel;

C) placing at least a second structural element to be bonded on said first structural element so that said second structural element at least partially covers said flow channel and adheres to said double sided adhesive gasket;

D) injecting an adhesive into the flow channel until said flow channel has been substantially filled with said adhesive, the double sided adhesive gasket providing the sole means of attachment of said first and second structural elements during injection of adhesive into said flow channel; and

E) allowing the adhesive to cure.

11. A method for forming a completed structure from a plurality of structural elements:

A) applying a first strip of double sided adhesive tape to a predetermined bonding area of a first structural element;

B) applying at least one additional strip of double sided adhesive tape to said predetermined bonding area of said first structural element, said at least one additional strip of double sided adhesive tape spaced apart from said first strip of double sided adhesive tape so as to define a flow channel therebetween;

C) placing a second structural element to be bonded on said first structural element so that said second structural element at least partially covers said flow channel and adheres to said first and second double sided adhesive tapes;

D) repeating steps A-C for each additional structural element comprising the completed structure until all of the structural elements have been secured in position by means of said double sided adhesive tapes;

D) injecting an adhesive into the flow channels formed by said plurality of structural elements until each of said flow channels has been substantially filled with said adhesive; and

E) allowing the adhesive to cure to form the completed structure.

12. A method for forming a structural assembly having a plurality of overlapping panels, comprising the steps of:

A) providing a plurality of panels each having opposing major surfaces, at least some of the panels having a temporary adhesive attachment means disposed upon at least one major surface thereof;

B) positioning said panels in a face-to-face relationship such that the major surfaces of said panels are substantially parallel, said temporary adhesive attachment means holding said adjacent overlapping panels in close and intimate contact without external clamping, and forming bonding regions therebetween;

C) injecting a permanent adhesive into said bonding regions; and

D) curing said permanent adhesive.

13. A method as described in claim 12, wherein said plurality of panels are composite panels.

14. A method as described in claim 12, wherein said temporary adhesive means is a double-sided adhesive tape.