Thermal impulse sealing bar assembly

Abstract

Abstract The disclosed thermal impulse sealing bar assembly includes an elongated thermally conductive bar defining a hollow chamber through which a cooling fluid is circulated. A flat lower surface of the bar faces the sheet or web material to be sealed, and the ends of the bar have curved or arcuate surfaces with the flat lower surface. A pair of flat resistance heating elements are mounted in spaced and parallel positions on the flat surface and include terminal portions at their opposite ends passing over the curved guide surfaces to be clamped in terminal blocks sidably mounted on the bar. Theterminal blocks are biased for movement in a direction generally perpendicular to the flat sealing surface to hold the resistance heating elements against the guide and flatsurfaces, thereby avoiding any interference between the material to be sealed and the terminal blocks. A layer of low resistivity, electrically conductive material on the terminal portions of the elements limits heating thereof to the part actually pressed against the material to be sealed so as to avoid the formation of "hot spots". A resistance cutting wire is disposed between the heating elements used for sealing.

Inventors

• 👤 John C Sellers
• 👤 John W Schneiter

Bibliographic Details