Cigarette pack laminate having raised sealing ridges

Claim 1

A cigarette pack made from a laminated blank having a thermally weldable outer layer with raised resiliently deformable linear bead portions oriented for sealed pack closure purposes the blank having surface portions of equal length defining a narrow width tube forming flap (21), side walls, a front wall and a rear wall (16), and adapted to be folded into a rectangular tube surrounding a group of cigarettes (10) with the tube forming flap underlying the sealed to an inner free edge of one of the walls, the blank further having end closing flaps (17-20) adjoining the front, side and rear walls, projecting out beyond the group of cigarettes, and folded against the ends of the group of cigarettes and sealed to each other, characterized by: (a) One of the tube forming flap and the inner free edge of said one of the walls having one of said raised linear beads directed toward the other of the tube forming flap and the inner free edge of said one of the walls and extending continuously across the full length thereof, and (b) the bead being completely overlaid by the other of the tube forming flap and the inner free edge of said one of the walls to ensure a continuous sealing contact in spite of any minor planar irregularities or waviness.