Abstract: There is disclosed a capping capsule for sealing attachment to the neck portion of a container such as a bottle. The capsule consists of a base wall portion in the form of a planar disc from which extends integral with the disc a heat shrinkable tubular side wall portion of substantially uniform thickness. The planar disc is thicker than the tubular side wall portion and the peripheral outline of the base wall is smaller than the inner peripheral outline of the side wall portion.

Abstract: The present tubular containers, for example for foodstuffs, toothpaste, or the like, have a top cap secured to an initially open ended tubular body by means of a heat bond such as soldering where metal containers are involved or welding or fusing where plastics materials are involved. The heat for making the bond is generated by friction resulting from relative rotation between the cap and the tubular body. For this purpose, a tool is provided with a rotatably supported counter presser forming an inner holding member and with a rotating presser tool forming an outer holding member which holding members hold the cap therebetween so that its outer rim contacts the edge of the tubular body to produce frictional heat when the cap and tubular body are rotated relative to each other, said frictional heat being sufficient to cause said bond.