Method for making an airtight wrapper and airtight wrapper thus obtained

Abstract

A method to make an airtight wrapper (10; 20) comprising a structured assembly (12) completely wrapped by a wrapping sheet (110; 120) made of a weldable material wherein the structured assembly (12) comprises a group of smoking articles (14) partly wrapped by a reinforcement insert (16), it provides to carry out the following operations in the desired order: positioning the wrapping sheet (110; 120), folded to a U shape, in contact with respective larger walls, front (21) and rear (24) and a smaller head wall (25) of the structured assembly (12), with respective upper (138), lower (137, transverse (139) and longitudinal (132, 132', 133, 133') flaps protruding beyond respective smaller bottom walls (26) and lateral walls (22, 33) of the structured assembly (12); welding the lower (137) andupper (138) flaps with respect to each other, and defining a welded transverse edge (37) disposed substantially aligned with the larger front wall (21); folding the welded transverse edge (37) rotating it by 180 degrees toward the larger front wall (21); folding the upper (139) and lower transverse flaps (140) toward the smaller front walls (22, 23); folding the upper (139) and lower (140) transverse flaps toward the lower lateral walls (22, 23); folding the rear (132', 133') and front longitudinal flaps (132, 133), and partly also the transverse edge (37), toward the lower lateral walls (22,23), overlapping one on top of the other above the transverse flaps (139, 140), and finally welding them with respect to each other to seal the airtight wrapper (10, 20).

Description

technical field [0001] The invention relates to a method of manufacturing an airtight wrapper in the field of smoking article boxes. In particular, the method allows an envelope-type airtight package to be formed around a group of smoking articles. [0002] The invention also relates to an airtight package for smoking articles. Background technique [0003] Smoking articles are traditionally packaged in rigid or semi-rigid boxes in which the smoking articles are wrapped in an inner wrapper, usually made of tinfoil. [0004] Typically, reinforcing inserts or collars are present in conjunction with the inner packaging. [0005] This form of packaging represents a compromise solution between production costs and the need to maintain unchanged the organoleptic properties of the tobacco present in the smoking article. [0006] In order to better preserve the quality of smoking articles, there is an increasing need to manufacture hermetically sealed inner packagings, that is, m...

AI Technical Summary

Problems solved by technology

[0014] A disadvantage of the known solution is that during the wrapping of the packaging sheet around the structural component, undesired folds are formed, which not only make the aesthetic appearance of the packaging aesthetically unpleasant, but also lead to Incorrect watertight welding of

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