Abstract: A blister sealing machine plate means is disclosed wherein a heater element which extends around the periphery of an opening therein, in which blisters are received, is maintained co-planar with the surface of the plate means at all times. Expansion or contraction of the heater element does not cause warping of the heater element as it is always maintained co-planar with the surface of the plate means by a heat permeable covering which extends over the plate means and the heater element because the covering on both sides of the heater element is bonded to the plate means.

Abstract: A sealing machine is disclosed which is useable for sealing products to a backing member, as of cardboard, by covering the products with a transparent cover and by gluing the cover to the backing. Such machine includes plate means adapted to receive and locate a cover into which is placed an article to be packed, said plate means having means to locate a backing, a loading station where the components can either manually or automatically be fed to the cover in the plate means and a sealing station having a movable pressure plate wherein the movable pressure plate is brought into contact with the backing to apply pressure to the backing and the cover while the two are sealed together.