Manufacture of easily openable foil bag

In a foil bag composed of a foil piece and tearing means, the bag having a flattened head portion having two walls, a longitudinal seam extending across one of said walls of the head portion, and a transverse seam which secures the two walls of said head portion to each other, said transverse seam being transverse to, and crossing, the longitudinal seam in the head portion and sealing the bag, the tearing means being spaced from the transverse seam in the direction toward the interior of the bag, and serving to aid opening by permitting a wall of the head portion which is not traversed by the longitudinal seam and which extends approximately across the width of the head portion to be torn open, and the tearing means being in the form of a strip provided with a gripping part projecting from the bag, the improvement wherein:

• said bag is provided with a U-shaped passage opening composed of two cuts parallel to, and one cut perpendicular to, said transverse seam in the head portion;
• said gripping part extends through said opening from the interior of said bag to the exterior of said bag;
• and said bag is further provided with a seam parallel to said transverse seam and at the opposite side of said opening from said transverse seam, and a sealing seam intersecting said transverse seam and at least in part covering said transverse seam and said seam parallel to said transverse seam to form therewith a gastight seal around said passage opening.