. . "ner disk is rolled over o y enough that after being turned down parallel tn the can-body, it does not turn up parallel with the can-body, as will be apparent from the sectional view Fig. 3, of the drawings. d, is a layer of paper saturated with parain, rosin, or a mixture of parafiin and rosin or other materials impervious to the action of lye, caustic soda or the like, and which paper circular sl" . .