Abstract: A method for making a coil assembly for a metal detector of the type used for detecting metal fragments in foodstuffs and pharmaceuticals, the method comprising providing a frame of non-metallic material, the frame having an aperture therethrough for the passage of material undergoing inspection, winding coils of electrically conductive strands on the frame, applying a first plastic coating in liquid form to the frame and coils, less the aperture portion of the frame, applying metal in fluid form to the first plastic coating to encase the first plastic coating in a metal layer, and applying a second plastic coating in liquid form to the metal layer to encase the metal layer in a second plastic coating.

Abstract: A method for making a coil assembly for a metal detector of the type used for detecting metal fragments in foodstuffs and pharmaceuticals, the method comprising providing a frame of non-metallic material, the frame having an aperture therethrough for the passage of material undergoing inspection, winding coils of electrically conductive strands on the frame, applying a first plastic coating in liquid form to the frame and coils, less the aperture portion of the frame, applying metal in fluid form to the first plastic coating to encase the first plastic coating in a metal layer, and applying a second plastic coating in liquid form to the metal layer to encase the metal layer in a second plastic coating.

Abstract: A coil assembly for a metal detector of the type used for detecting metal fragments in foodstuffs and pharmaceuticals, the coil assembly comprising a frame of non-metallic material, the frame having an aperture therethrough for the passage of material undergoing inspection, coils of electrically conductive strands wound upon the frame, a first plastic coating adhered to the frame and coils, less the aperture portion of the frame, a layer of metal adhered to the first plastic coating to encase the first plastic coating in the metal layer, and a second plastic coating adhered to the metal layer to encase the layer in the second plastic coating.

Abstract: A coil assembly for a metal detector of the type used for detecting metal fragments in foodstuffs and pharmaceuticals, the coil assembly comprising a frame of non-metallic, the frame having an aperture therethrough for the passage of material undergoing inspection, coils of electrically conductive strands wound upon the frame, plastic material adhered to the frame and coils, less the aperture portion of the frame, and a coating of metal adhered to the plastic material to encase the plastic material in a metal layer.

Abstract: A coil assembly for a metal detector and a method for making the coil assemblies for metal detectors of the type used for detecting metal fragments in foodstuffs and pharmaceuticals, the method comprising providing a frame of non-metallic material, the frame have an aperture therethrough for the passage of material undergoing inspection, winding coils of electrically conductive strands on the frame, applying plastic in liquid form to the frame and coils, less the aperture portion of the frame, and applying metal in fluid form to the plastic to encase the plastic in a metal layer.

Abstract: A coil assembly for a metal detector and a method for making coil assemblies for metal detectors of the type used for detecting metal fragments in foodstuffs and pharmaceuticals, the method comprising providing a frame of non-metallic material, the frame have an aperture therethrough for the passage of material undergoing inspection, applying a coating of carbon material to the exterior of the frame, applying a layer of plastic material over the carbon material, winding electrically conductive strands over the plastic material, fixing the frame to a rigid metal housing providing an enclosed void around the exterior of the coated frame and strands, and applying foam plastic in liquid form to the frame and strands until the void is filled with the foam plastic.

Abstract: A coil assembly for a metal detector of the type used for detecting metal fragments in foodstuffs and pharmaceuticals, the assembly comprising a frame of non-metallic material, the frame have an aperture therethrough for the passage of material undergoing inspection, a coating of carbon material applied to the exterior of the frame, a layer of plastic material applied over the carbon material, electrically conductive strands wound over the plastic material, the frame being fixed to a rigid metal housing providing an enclosed void around the exterior of the coated frame and strands, and foam plastic enveloping the frame and strands, the void being filled with the foam plastic.