Title: Bottom seal horn and mandrel

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Abstract: Vibration sealing apparatus including a vibrating horn and a stationary mandrel having rectangular work faces for opposing each other to seal a rectangular end closure of a thermoplastic coated paperboard carton. The work face of the vibrating horn defines an elongated depression extending between a pair of its opposite edges with a predetermined depth and also defines a pair of spaced depressions associated with each of the opposite edges. The spaced depressions have a depth greater than the elongated depression and each pair of the spaced depressions forms a pointed configuration that points toward the other pair of spaced depressions. Preferably, the spaced depressions of each pair have the shape of right triangles with the right angle vertices thereof located adjacent the associated edge of the work face in a spaced relationship thereto and adjacent each other in a spaced relationship. One embodiment of the horn has only one of the triangular depressions of each pair overlapping the elongated depression to provide sealing of a "non-tuck-in" carton end closure. Another embodiment of the work face has both triangular depressions of each pair overlapping the elongated depression to provide sealing of a "tuck-in" carton and closure. In both horn embodiments, an edge depression extends along one of the edges of the work face from one end of the elongated depression outwardly to one side thereof with the same depth as the elongated depression. The mandrel work face includes diagonal depressions defining a central junction at which a pair of opposed triangular projections are located. Preferably, the diagonal depressions of the mandrel work face include offset portions on opposite sides of the junction thereof and have the same depth as the height of the triangular projections and as the depth of the triangular depressions on the horn work face.


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