Flat cable and process for producing the same

A process for producing a flat cable, comprising the steps of:

• feeding a plurality of insulated conductors, juxtaposed to one another, together with a resin tape into a mold, the plurality of insulated conductors each comprising a conductor covered with an insulative layer, said mold comprising a combination of openable upper and lower molds, the upper and lower molds each having in its inner surface a plurality of grooves for accommodating therein the plurality of insulated conductors, the mold being constructed so that, upon accommodation of the plurality of insulated conductors respectively in the plurality of grooves in the mold, adjacent insulated conductors come into contact with each other;
• after the accommodation of the plurality of insulated conductors and the resin tape in the plurality of grooves of the mold, closing the upper and lower molds to confine the plurality of insulated conductors and the resin tape within the plurality of the grooves;
• and
• applying heat to fuse adjacent insulated conductors in their insulative layers to each other to form an integral insulative layer having on its surface crest portions and root portions as viewed in the cross section of the insulated conductors, and to fuse the resin tape to the integral insulative layer so as to conform to the shape of the surface of the integral insulative layer having crest portions and root portions.