Patent ID: 8176713

Claim:
A method of manufacturing pop-to-open bags, comprising: feeding foil web to a bag-making machine; deforming the foil with at least one punch to form two indentations in the foil web; forming the foil web into a foil tube with the two indentations aligned with each other; sealing the foil tube with two opposing sealing jaws having aligned blanks to form a transverse seal zone with the aligned indentations received in the aligned blanks and cooperatively defining a bubble in the transverse seal zone; and separating sealed sections of the foil tube into the pop-to-open bags, wherein each of the pop-to-open bags has an interior space containing the article, the interior space is a separate element from the bubble when the pop-to-open bag is unopened, and under application of a compressive force the bubble bursts by a resulting pressure of a fluid in the bubble creating in the seal zone a failure zone through which the fluid is expelled to thereby expose free edges of the pop-to-open bag that can be gripped and pulled to open the pop-to-open bag.