Apparatus for producing a tear line in the multi-layered foil of

Details Apparatus for producing a tear line in the multi-layered foil of Apparatus for producing a tear line in the multi-layered foil of

1981-05-26

1983-06-07

Coan, James F.

Manufacturing container or tube from paper; or other manufacturi

With extruding, drawing, or attenuating

413 17, 493 61, 493212, 493242, 493396, 493470, 493930, B31B 125

Patent

active

043869254

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.

REFERENCES:
patent: 3359773 (1967-12-01), Stuchbery
patent: 3533550 (1970-10-01), Benzon-Petersen
patent: 3952868 (1976-04-01), Muller et al.
patent: 4085569 (1978-04-01), Seragnoli

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