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US 2004/0169314 A1Published application
Method and device for fabricating composite materials and bonded sheet items
AssigneeSaab AB
InventorJan Vaara
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AssigneeSaab AB
InventorJan Vaara
Estimating the term…
This invention refers to a method and a device for use in connection with the fabrication of multilayer products (8) such as composites and bonded multilayer sheet products, ect. by beans of the so-called “bagging technique,” to increase the compressive pressure (P) on the product being created beyond normal atmospheric pressure. In the bagging technique, which is used to join a plurality of different material layers with one another to form a unit via polymeric binder layers, atmospheric pressure is normally used to press the various objects together in that they are enclosed in a depressurized gas-impervious bag (9, 21) while the various layers are joined to form a unified product. According to the invention, the atmospheric pressure acting upon the outside of the bag is adsorbed by a first material surface (3+4+5) that is larger than the surface of the multilayer product whose intermediate binder layers are to be caused to join together, while a second material surface (3) facing the opposite direction is used to transfer said composite pressure load (P) to the product to be fabricated. The invention also includes a method and a device for distributing the pressure load (17, 18, 10) laterally in connection with the fabrication of e.g. a U-channel-shapped object with the help of the wedge effect.
A method, for use in connection with the fabrication of multilayer products such as composites and bonded multilayer sheet products (8), etc. by means of the so-called “bagging technique,” which involves joining a plurality of different material layers with one another to form a unit via polymeric binder layers, while the entirety of the unit comprised of all the material layers inside a gas-impervious bag (9, 21) that is depressurized relative to the ambient atmosphere is subjected to the combined compressive pressure of the ambient atmosphere while the various layers are joined into a unified product, of increasing said compressive pressure acting upon the product being created to beyond normal the atmospheric pressure, characterized in that the atmospheric pressure acting upon the outside of said bag (9, 21) is absorbed as a composite pressure load by a first material surface that is larger than the surface of the multilayer product whose intermediate binder layers are to be caused to join together adjacent material layers, and wherein said first material layer is realized as a unit with a second material surface (3+4+5) that faces in the opposite direction and is used to transfer said composite pressure load to the multilayer product to be fabricated, and to compress same between itself and a fixed counter-die (1).
Dependencies are inferred from the claim text.