| 摘要 |
A process for the manufacture of a heat exchanger from a thermoplastic polymer especially a polyamide, is disclosed. The heat exchanger comprises two generally planar panels (11) formed from a composition of the polymer, bonded together to form a labyrinth of fluid passages (16,16A,16B) between the panels (11) that extend between inlet and outlet means (17,18). The labyrinth occupies a substantial proportion of the area of the panels. The process comprises coating a first panel with a first coating in a pattern corresponding to the fluid passages of the labyrinth, and coating the second panel with a second coating composition in at least those areas where a bond is to be formed with the first panel. The coating compositions are selected so that under the influence of heat, the second coating composition will bond to the polymer composition but not to the first coating; thus the first coating acts as a resist coating. The coated panels are brought into contact and heated so as to effect bonding, and then the passages are expanded e.g. by applying a pressure of a gas to the fluid passages between the panels. The expanded fluid passages should be heat set so as to reduce distortion during use of the resultant heat exchanger. Depending on the polyamide selected for fabrication of the heat exchanger, the heat exchangers may be used in a variety of end uses, including in automobiles. |
