Multi-layered foil cigarette pack including method and apparatus for producing a tear line in the foil
AssigneeFocke & Co. (GmbH & Co.)
InventorHeinz Focke
Life of this patent
Estimating the term…
Abstract
A multi-layer bonded foil 10 which forms the inner wrapper of a cigarette pack is provided with a tear line 14 to facilitate opening a tear flap 15. The tear line is formed by a fixed lower tool 25 having a raised rib 28 flanked by grooves 29, 30 and a reciprocable upper tool 20 having a pointed edge 21 and movable between guide supports 22, 23. The upper tool is heated and forced into the foil to stretch-weaken its upper polyester layer 11 and central aluminum foil layer 12, and to simultaneously heat soften and deform its lower polyethylene layer 13.
Claims8
A cigarette pack made of a multi-layered, composite bonded foil having a moisture and aroma proof layer of metal foil, and an exterior layer of a thermoplastic material, particularly polyethylene, and having a premarked tear line on the foil defining a removable flap for opening the pack, characterized by:
- the tear line (14) having a reduced thickness formed by the thermal deformation of at least the thermoplastic layer (13) and a reduced thickness of said metal foil.
Dependencies are inferred from the claim text.