Method and device for wrapping groups of stacked products in the manufacture of sealed packs

Abstract

Groups of products stacked on edge are wrapped in sealed stick packs by a method that involves passing a sheet () of heat-sealable wrapping material around each group () of products () and sealing the two side edges () in such a way as to fashion a tubular wrapper () with end portions () projecting axially from the assembled group (), then spreading each end portion () flat by inserting a tongue () and heat-sealing each relative pair of flattened edges to render the wrapper airtight. Thereafter, the sealed ends are subjected to a cold crimping action from which each end portion () emerges with two impressed crease lines () positioned to delimit a central portion () that will be folded directly against the corresponding end face of the group (), and two lateral portions () that will be folded inwards over the central portion ().