# US 8,273,430 B2 · Metal/polymer laminate ducting and method for making same

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- Number: US 8,273,430 B2
- Document ID: US8273430B2
- Status: Granted
- Kind: B2
- Application number: 11/700,797
- Filed: 2007-01-31
- Published: 2008-07-31
- Granted: 2012-09-25
- Earliest claimed: 2007-01-31
- Assignees: Senior Investments AG
- Inventors: Leslie Fernandes
- Web page: https://patentgrep.com/patent/US8273430B2

## CPC

- B29C 70/088: {and with one or more layers of non-plastics material or non-specified material, e.g. supports}
- B29C 70/885: {with incorporated metallic wires, nets, films or plates (as lost heating elements B29C35/0272, B29C61/0625)}
- F02C 7/04: Air intakes for gas-turbine plants or jet-propulsion plants
- B29L 2009/003: {comprising a metal layer}
- B29L 2023/00: Tubular articles (B29L2024/00 takes precedence {; catheters B29L2031/7542})
- B29L 2031/18: Heat-exchangers or parts thereof
- B29L 2031/7504: {Turbines}
- B32B 2311/00: Metals, their alloys or their compounds
- B32B 2379/08: Polyimides
- Y02T 50/60: Efficient propulsion technologies, e.g. for aircraft
- Y10T 428/13: Hollow or container type article [e.g., tube, vase, etc.]
- Y10T 428/1303: Paper containing [e.g., paperboard, cardboard, fiberboard, etc.]
- Y10T 428/1352: Polymer or resin containing [i.e., natural or synthetic]
- Y10T 428/1359: Three or more layers [continuous layer]
- Y10T 428/1362: Textile, fabric, cloth, or pile containing [e.g., web, net, woven, knitted, mesh, nonwoven, matted, etc.]
- Y10T 428/139: Open-ended, self-supporting conduit, cylinder, or tube-type article
- Y10T 428/1393: Multilayer [continuous layer]
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00)
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A laminated duct structure for gas turbine engines, and a method for manufacturing laminated duct structures for gas turbine engines. The duct structure incorporates a metallic inner layer and a polymeric outer layer. Preferably, the thin metallic layer is a corrosion resistant material such as corrosion resistant stainless steel or titanium. The supporting outer polymeric layer is, in a preferred embodiment of the invention, a polyimide material, such as polyimide resin-impregnated fiberglass cloth.

## Claims

### Claim 1

A laminated duct structure, for conveying air from a first location to a second location, the duct structure comprising:
a substantially uninterrupted U-shaped first metallic skin portion devoid of any slits for forming said first metallic skin portion into a curved body, said first metallic skin portion including opposing first and second longitudinal edges extending between the first location and the second location;
a substantially uninterrupted U-shaped second metallic skin portion devoid of any slits for forming said second metallic skin portion into a curved body, said second metallic skin portion including opposing first and second longitudinal edges extending between the first location and the second location;
said first and second longitudinal edges of each of said first and second metallic skin portions being respectively juxtaposed to one another and respectively joined to one another;
said first and second metallic skin portions forming a metallic innermost substantially continuous, self-supporting layer of the duct structure for conveying the flow of the air from the first location to the second location, said metallic innermost layer having an inner surface proximate to which said air flows, as well as having an outer surface; and
an uninterrupted continuous, sealed polymeric outermost layer extending over said outer surface of said metallic innermost layer, said polymeric outermost layer being bonded to said outer surface of said metallic innermost layer,
said polymeric outermost layer being formed, at least in part, from at least one layer of polyimide resin impregnated fiberglass cloth.

### Claim 2 (depends on 1)

The laminated duct structure according to claim 1, wherein said metallic innermost layer is fabricated from one of the following materials: corrosion resistant steel; titanium.