| 摘要 |
Sheet-shaped heater, in particular for use as a bed heater, and a water bed heater respectively. When designing such heaters it is difficult to obtain an optimal combination of properties for satisfying the different requirements imposed, inter alia with respect to reliability and safety, uniform temperature distribution and mechanical flexibility. For heat distribution the element comprises a continuous metal foil (22) in which there is formed a continuous meandering groove (20) which lies substantially at one side of the plane of the metal foil. There is no thickness reduction of the metal foil at the groove (20) formed. A heat emitting conduit, preferably a heating cable (21a-c) is tightly received in the groove, the depth thereof being substantially equal to the transverse dimension of the conduit. An outer protective layer (23) is tightly joined to the metal foil (22) and preferably to a portion of the surface of the conduit (21a-c) at that side where the groove (20) is open. |
