Patent ID: 7243703
Filing Date: 2007-07-17
Classification: F24S,F28F,Y02E,Y10S,Y10T

Abstract:
1. A flexible heat exchanger comprising a pair of flexible multilayer thermoplastic polyimide films each of which comprises an aromatic polyimide substrate film showing no glass transition temperature or a glass transition temperature of 340° C. or higher and a thermoplastic aromatic polyimide surface film showing a glass transition temperature in the range of 190 to 300° C. in which the surface films of the flexible multilayer thermoplastic polyimide films face each other and are in part fused together, whereby producing between the flexible multilayer thermoplastic polyimide films a conduit pattern through which a fluid passes, wherein said flexible multilayer thermoplastic polyimide films have a thickness in the range of 10 to 125 μm and comprises a linear expansion coefficient of MD, a linear expansion coefficient of TD and an average of linear expansion coefficients of MD and TD, in the range of 10×10