Patent ID: 7257936
Filing Date: 2007-08-21
Classification: B65B

Abstract:
1. A method for wrapping groups of stacked products in the manufacture of sealed packs, comprising the steps of: folding a sheet of heat-sealable wrapping material around a group of products; sealing together two side edges of each sheet so as to fashion the sheet into a tubular wrapper having end faces, with end portions projecting axially from the group; introducing a tongue into each tubular end portion in such a way as to spread and deform the end portion, causing it to assume a flattened appearance; closing each flattened end portion by means of a heat-sealer to form closed end portions; generating two crease lines on each closed end portion to divide each closed end portion into a central portion and two lateral portions, wherein the step of generating two crease lines on each closed end portion includes crimping each closed end portion between a first folder element and a second folder element presenting respective contact ends capable of movement between a position distanced one from the other and a position of proximity of one to another; constructing and arranging the contact end of the first folder element to be of parallelepiped geometry and having a transverse dimension smaller than a transverse dimension of the closed end portion; constructing and arranging the contact end of the second folder element to present a “U-shaped” profile having a recess to accommodate the contact end of the first folder element; folding the central portion against the respective end face of the group; folding each of the two lateral portions over the central portion.