An apparatus for sealing a cover film to a blister film having blisters holding respective small objects has a feed roll rotatable about an axis and formed with an array of radially outwardly open recesses arrayed like the blisters of the blister film. The main body includes a pressing part adapted for pressing a heat sink toward a heat-generating component, an engaging part and a latching leg, the engaging part and the latching leg being disposed at opposite ends of the pressing part. The structural elements are preferably closed frames, which are formed from at least two vertical longitudinal struts and at least two horizontally connecting stays.