Single stage debulk and cure of a prepreg material

Patent metadata

Field	Value
Publication number	US-10155366-B2
Application number	US-201113696944-A
Country	US
Kind code	B2
Filing date	Jan 11, 2011
Priority date	Jan 11, 2011
Publication date	Dec 18, 2018
Grant date	Dec 18, 2018

Abstract

An apparatus and method for repairing a damaged laminate including the process of cutting out a damaged section and replacing damaged section with a repair laminate, then covering the repair laminate with a vacuum bag having a heater disposed therein. Thereafter, applying heat and pressure to the repair laminate with the heater and vacuum bag to adequately debulk and cure the repair laminate.

First claim

The invention claimed is:

1. An apparatus for debulking and co-bonding a repair laminate attached to a damaged laminate, the apparatus comprising:
a porous material positioned directly on the repair laminate;
a perforated release film placed on the porous material;
a fiberglass material positioned above the porous material, the fiberglass material being configured to provide sufficient bleeding of froth resign and gases;
a heater blanket positioned above the fiberglass material, the heater blanket having:
a layer of pliable heat absorbing material, the layer of pliable heat absorbing material being configured to conform to a contour of the damaged laminate placed thereon; and
a wire disposed within the pliable heat absorbing material, the wire being electrically coupled to an external electrical power source;
wherein electrical power from the external electrical power source passes through the wire, which in turn creates heat that passes through the pliable heat absorbing material; a vacuum bag attached to a surface of the damaged laminate, the vacuum bag forming an airtight cavity, the airtight cavity being adapted to receive the heater blanket therein; and a vacuum valve in gaseous communication with the airtight cavity, the valve being configured to provide access to a gas trapped within the airtight cavity during an excavation process; wherein the fiberglass material is non-compressible; wherein a porosity of the perforated release film is coarse and a porosity of the porous material is fine; wherein an amount of the electrical power passing through the wire of the heater blanket is adjusted to provide sufficient heat;

and
wherein an amount of suction pressure to the vacuum bag is adjusted to create a negative pressure on the repair laminate while debulking and co-bonding the repair laminate.

2. The apparatus according to claim 1 , wherein a breather material bleeds gases from a gas pocket disposed within the repair laminate while debulking and co-bonding the repair laminate.

3. The apparatus according to claim 2 , further comprising:
a release film placed between the heater blanket and the fiberglass material.

4. The apparatus according to claim 1 , further comprising:
an attachment device for securing the vacuum bag to the surface of the damaged laminate.

5. The apparatus according to claim 4 , wherein the attachment device is an adhesive tape.

6. The apparatus according to claim 1 , further comprising:
a thermocouple positioned within the airtight cavity.

7. An apparatus for debulking and co-bonding a repair laminate for a damaged laminate, the apparatus comprising:
a bleeder material placed on a surface of the repair laminate;
a perforated release film placed on the bleeder material;
a fiberglass material placed on the bleeder material, the fiberglass material being configured to provide sufficient bleeding of froth resign and gases;
a heater blanket positioned on the fiberglass material, the heater blanket having:
a layer of pliable heat absorbing material, the layer of pliable heat absorbing material being configured to conform to a contour of the damaged laminate placed thereon; and
a wire disposed within the pliable heat absorbing material, the wire being electrically coupled to an external electrical power source;
wherein electrical power from the external electrical power source passes through the wire, which in turn creates heat that passes through the pliable heat absorbing material;

a breather material positioned on the heater blanket;
a vacuum bag attached to a surface of the damaged laminate, the vacuum bag forming an airtight cavity, the airtight cavity adapted to receive the bleeder material, the heater blanket, the fiberglass material, and the breather material; and
a vacuum valve in gaseous communication with the airtight cavity, the valve being configured to provide access to a gas trapped within the airtight cavity during the an excavation process; wherein the fiberglass material is non-compressible; wherein a porosity of the perforated release film is coarse and a porosity of the porous material is fine; and wherein during the debulking and co-bonding of the repair laminate, the heater blanket creates heat and the vacuum bag exerts negative pressure on the repair laminate, the breather material provides gas passage within the airtight cavity, and the bleeder material bleeds gases from a gas pocket disposed within the repair laminate.

8. The apparatus according to claim 7 , further comprising:
an attachment device for securing the vacuum bag to the surface of the damaged laminate.

9. The apparatus according to claim 8 , wherein the attachment device is an adhesive tape.

10. The apparatus according to claim 7 , further comprising:
a thermocouple positioned within the airtight cavity.

11. The apparatus according to claim 1 , wherein the perforated release film is comprised of a plurality of holes each having a diameter of 2 inches.

12. The apparatus according to claim 7 , wherein the perforated release film is comprised of a plurality of holes each having a diameter of 2 inches.

Assignees

• Whitworth Denver R
• Cribb Vance N
• Textron Innovations Inc

Inventors

• Whitworth Denver R
• Cribb Vance N

Classifications

• B29C73/12

  Apparatus therefor, e.g. for applying (B29C73/30 takes precedence) · CPC title

• B29C37/006 Primary

  Degassing moulding material or draining off gas during moulding (venting means in moulds B29C33/10) · CPC title

• B32B37/10 Primary

  characterised by the pressing technique, e.g. using action of vacuum or fluid pressure · CPC title

• B30B5/02

  wherein the pressing means is in the form of a flexible element, e.g. diaphragm, urged by fluid pressure · CPC title

• B29C37/0064

  of reinforced material · CPC title