A method of fabricating heating structures in which a heating wire having a thermoplastic outer layer is arranged in a predetermined pattern and one or more strands of thermoplastic material are applied to the individual sections and bonded thereto. The area near the bond is heated to a temperature sufficient to fuse the surfaces of the wire and strand or strands and, after the wire and strands have cooled, the strands adhere to the sections, thus forming an integrated heating structure from the separate heating wire sections and thermoplastic strands. The sections may be parallel to one another and the strands applied thereto in substantially right angle relationship, and when a number of strands are applied to the wire sections, they normally are applied simultaneously and in parallel relation.
Easy Heat-Wirekraft, MSP Industries Corporation - Lakeville IN
International Classification:
H06B 300
US Classification:
156433
Abstract:
A machine for fabricating heating structures having heating wires with an external layer of thermoplastic material arranged with sections in a predetermined pattern, and carrier strands of thermoplastic material fused to and interconnecting the wire sections. The machine includes a wire support means having laterally spaced pegs or the like on which the wire is retained in a predetermined configuration on a substantially common plane. A heating unit or units simultaneously heat the carrier strands and wire sections together. The heating elements and wire configuration are moved relative to one another to join progressively the strands to the transversely arranged heating wire sections. The element used in the heating unit includes a guide trough for the carrier strands and simultaneously heats facing surfaces of the strands and heating wire so that the two can be pressed together while fused to form the bond. The invention also includes the method having the steps of heating the strands and heating wire and pressing the two together, while the two have facing fused areas, to form a bond between the strands and the heating wire.