Abstract: In a method for the thermal bonding of a base part (3) of a packaging with a cover film (F), especially for the welding or sealing of a base part of a packaging for contact lenses with a cover film, the contact surface of the base part (3) facing the cover film (F) and the corresponding contact surface of the cover film (F) facing the base part are mechanically pressed against one another along a join. While the mechanical pressure is being generated along the join, heat is simultaneously caused to act on the join, so that the contact surfaces of base part (3) and cover film (F) are thermally bonded to one another along the join. For the purpose of generating the mechanical pressure and causing heat to act on the join there is used a contact plate (70) of low heat capacity which, during the thermal bonding, is pressed against the surface of the cover film (F) remote from the contact surface.