Quick-opening bag for packaging, especially for vacuum packaging food products in particular coffee

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Reference is made first of all to FIGS.
1 to 3.
FIG.
1 shows, in the completely closed state, a bag according to the invention which is folded up so as to form a substantially parallelepipedic body 1 having a plane upper face onto which two triangular flaps 3 are applied.
On account of the folding configuration produced, this being conventional in itself, there is formed at the top of the bag a rectangular upper end zone 4 which extends transversely relative to the rectangular upper face 2 of the bag between the pointed portions of the triangular flaps 3.
This rectangular zone 4 which, as can be seen in FIG.
2, projects upwards once the triangular flaps 3 have been unfolded from the position illustrated in FIG.
1, is in fact formed by the application of the ends of the opposite faces of the bag onto one another.
The long side 5 of the rectangular zone, constituting the upper edge of this zone, is thus formed by juxtaposing the end edges of the opposite faces of the bag at the top of the latter.
The long lower side 6 is formed by the lines for folding the ends of the opposite faces of the bag relative to the parts of the bag constituting the upper face 2 and the flaps 3.
In a conventional manner, the bag is sealed in the zone 4 by a weld line 7 which extends over the entire length of the latter substantially midway between the long upper side 5 and the long lower side 6.
This weld line, produced for example by applying heat, seals the bag hermetically.
According to the invention, it is envisaged to produce a cutout 8, of triangular shape in the example illustrated, the slot having an edge 9 which is perpendicular to the sides 5 and 6 and is continued by an edge arranged parallel to these long sides 5 and 6, the two edges 9 and 10 being joined by an edge which is inclined so as to constitute a cutout in the form of a right-angled triangle.
This cutout passes through the two walls constituting the rectangular end zone 4 and is produced, for example, by punching with the aid of an appropriately shaped tool