Device for Hot Welding of Plastic Sheets

Abstract

A device for welding plastic sheets using of hot gas heated in a tubular conduit through which an electric current flows. The device has at least one gas inlet and several gas outlet openings the electrical resistance of which changes depending on the temperature. At least one metal strip is electrically connected to the tubular conduit in the segment of the tubular conduit which is provided with the gas outlet openings in order to influence the temperature differences of the hot gas flows exiting the individual gas outlet openings. The segment of the tubular conduit provided with the gas outlet openings is located between two gas inlet openings which are arranged at an axial distance. At least one metal strip is attached in the central area of this segment of the tubular conduit.

Dependencies are inferred from the claim text.