Abstract: The invention relates to a flexible multilayer heating device, of the heating mat type, for implementing preforming or consolidation of fibrous preforms of composite parts. The device includes at least one first support layer, at least one first heating lead arranged on the at least one first support layer and defining a heat-treatment surface adapted to the surface of the composite part to be preformed or consolidated. A first network of wires is electrically connected to the at least one first heating lead. At least one second heating lead is arranged on the at least one first support layer and defines at least one thermal-blocking belt at the at least one periphery of the heat-treatment surface. A second network of wires is electrically connected to the at least one second heating lead. The invention also relates to plant equipped with a mould and such a heating mat.

Abstract: Breathing circuits for medical respiratory devices which have an inspiratory conduit for delivery of respiration-related aeriform substances to a patient, may also have a expiratory conduit, and, in any case are arranged to communicate with a patient interface, such as a wye (14), and have heating means for respiration-related aeriform substances in at least the inspiratory conduit. The heating means may be a heated-liquid heating tube (11) within at least the inspiratory conduit or an electrical heating wire (38) on or in an inspiratory conduit comprising respiratory hose (37). The tube is in circulatory relationship with a heated-liquid reservoir (13) and is arranged internally to contain heated liquid (30) from the reservoir, and to transfer heat from the liquid--by radiation and conduction from the tube wall--to the substances in the conduit.