| 摘要 |
A radiant heater panel is formed by sandwiching between two pieces (10, 18) of calcium silicate board a heating insert comprising a first sheet of plastics having a thick film of electrically resistive coating applied thereto to form a heating element 12, the element 12 being covered by a further plastics sheet bonded to the first sheet, The heating insert may comprise plastics backed foil sheets 26 applied to either side of the first-mentioned sheets. The heating insert, a terminal structure (14, 15, 20) applied thereto and a power supply lead extending therefrom are placed between the two calcium boards 10, 18 after opposing marginal regions of the boards 10, 18 have been coated with heat-activated adhesive. The boards 10, 18 are then pressed together and the adhesive activated by radio frequency welding to hold the structure together. <IMAGE> |
