초록 ▼

An electric heater consists of an open mesh net of heat resistant filaments, for example fiberglass filaments, carrying electrically resistive material, for example, carbon black. On either side of the net is a mat of fiberglass reinforcement. The net and the fiberglass reinforcement are impregnated

An electric heater consists of an open mesh net of heat resistant filaments, for example fiberglass filaments, carrying electrically resistive material, for example, carbon black. On either side of the net is a mat of fiberglass reinforcement. The net and the fiberglass reinforcement are impregnated with a cured, thermosetting synthetic resin. In some embodiments a ground layer is also incorporated between layers of the fiberglass mat. The heater is manufactured by assembling the heater, the fiberglass mats and any ground layers, impregnating the mat thus produced and pultruding the impregnated mat to set the resin matrix of the heater.

대표청구항 ▼

An electric heater including: a heating element comprising an open mesh net of heat-resistant filaments carrying electrically resistive material, conductive buses connected to the material at spaced locations thereon, a matrix of cured, thermosetting synthetic resin in which the net and buses are em

An electric heater including: a heating element comprising an open mesh net of heat-resistant filaments carrying electrically resistive material, conductive buses connected to the material at spaced locations thereon, a matrix of cured, thermosetting synthetic resin in which the net and buses are embedded, the resin being reinforced on opposite sides of the net with an electrically insulating heat-resistant fibre material and an electrical ground layer comprising a conductive foraminous material layer embedded within the body of fibre reinforced resin material on each side of the heating element and separated therefrom by a layer of the fibre reinforced synthetic resin.