Sealing tool for heat-sealing a pull-off lid onto a container

Sealing tool for heat-sealing a pull-off lid onto a container to form a sealing seam between the container and the lid, said lid including a tearing-open tab for pulling the lid off by hand, which comprises a sealing tool having sealing jaws with essentially flat pressure surfaces thereon, each of said essentially flat pressure surfaces having inner and outer edges and a width for making the sealing seam, at least one sealing jaw being equipped, at least in the region of the tearing-open tab portion of said lid, with recesses which start from the outer edge of the pressure surface of said at least one sealing jaw and which extend less than half of the width of the pressure surface, said tool operative to heat seal said pull-off lid with said tearing-open tab onto the container and to permit easy opening thereof.