The disclosure relates to a method in the forming of packaging containers (1) which have sealing fins in which the packaging material is sealed inside-to-inside, and also projecting, double-walled corner flaps (8). In order to form a parallelepipedic packaging container, the corner flaps are folded down and sealed to the outside of the packaging container, which subjects a sealing fin running between the corner flaps to stresses which may entail untightness in the packaging container. This is avoided in that the sealing fin, prior to the downward folding operation, is deformed in that at least a portion of the fin (4) is laterally displaced in relation to adjacent portions of the fin.
A paper packaging container is obtained by tube forming with a longitudinal seal of web-shaped packaging material. The package is filled with liquid food, and a transverse seal of the tube packaging material is made to form a pillow-shaped preliminary shape container. The preliminary shape container is then cut, and a final shape container having a top, side walls and a bottom is formed by folding the packaging material along crease lines. Flaps are formed during the forming of the top of the container and are folded outwardly and downwardly onto side wall faces of the container. The top of the container is formed as a shed roof shape. The method of folding the flaps outwardly from the top of the container and the resulting shaped container allows attachment of a large spout with a wide mouth on the top, while achieving high speed manufacturability without subjecting the paper packaging material to high stresses.
A sealed package (1, 1') for pourable food products, made from sheet packaging material and having a top wall (6) crossed by a transverse sealing band (15) forming flat projecting tab (21) folded coplanar with and onto the top wall (6) along a bend line (22), and an opening device (8) fitted to a portion of the top wall (6) bounded on one side by the sealing band (15); the tab (21) has a flat striplike auxiliary portion (25) interposed between the sealing band (15) and the bend line (22), so that the area of the portion of the top wall (6) available for the opening device (8) is increased by the width of the auxiliary portion (25).
