METHOD AND APPARATUS FOR CLOSING OPEN END OF CARTON BLANK

摘要

A carton closure system including a pressure pad (24) of conventional design which is urged against the external surfaces of a plurality of loosely associated overlying prefolded end side wall portions of the bottom end of a carton blank (32) which is disposed on a mandrel (34) which includes a backup pad disposed within the carton and contiguous to the internal surfaces of the prefolded end side wall portions to thereby capture the prefolded end side wall portions between the pressure pad and the backup pad. The force for urging the pressure pad initially against the loosely associated overlying prefolded end side wall portions and thereafter providing a sealing pressure against the infolded end side wall portions and maintain this sealing pressure for a time sufficient to permit solidification of the softened heatsealable component of the carton blank, is generated by means of a piston/cylinder (70) operating through a pivoted arm whose distal end carries a cam follower that is moved against a linearly reciprocative cam (120) which is operatively associated with the pressure pad.