B - Operations – Transporting – 65 – D
Patent
B - Operations, Transporting
65
D
93/11, 220/18
B65D 33/16 (2006.01) B65B 61/02 (2006.01) B65B 61/08 (2006.01) B65D 65/26 (2006.01) B65D 75/58 (2006.01) B65D 75/44 (2006.01)
Patent
CA 1163249
ACCURATELY PLACED STRESS CONCENTRATING APERTURE IN FLEXIBLE PACKAGES Arthur E. Frohwerk David E. Enting ABSTRACT An "easy open" feature for a sealed flexible pouch and method and apparatus for accurately position- ing said feature in the sealed border region of said flexible pouch. The feature comprises a stress con- centrating aperture exhibiting a strong tendency to initiate a directional tear while maintaining integrity of the sealed pouch until an opening force is applied. In a preferred embodiment the pouches are cut from a moving web by a rotary shear cutter while a web punching means operatively connected with each cutter blade is engaged in the moving web. Because the web undergoes no movement relative to the cutting means or the punching means until both operations have been completed the aperture is precisely positioned with respect to the severed edge of the pouch. In a particularly preferred embodiment, the sealed edge of the pouch is subjected to a high level of tension and is unsupported in the area of contact with the punching means during the aperturing operation. This concentrates the stress applied by the punching means and helps to form an aperture in the seal, even where tough and/or stretchy pouch materials which are prone to stretch and deform rather than rupture are employed. While the precise shape of the aperture is not critical, it is preferably non-circular in order to provide at least one area of stress concentration within the aperture and thereby facilitate tearing at relatively low levels of applied stress.
376876
Enting David E.
Frohwerk Arthur E.
Gowling Lafleur Henderson Llp
The Procter & Gamble Company
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