Hermetic package for liquid or pasty food products and method for making the package

Method for making a hermetic package for a food product comprising the following steps:

• feeding a continuous film;
• cutting the continuous film to form a plurality of single sheets and forming longitudinal and transverse weakening lines on each single sheet to define folding lines for forming a container having a triangular prismatic conformation;
• providing a forming mandrel with a prismatic shape;
• coupling the single sheet to the forming mandrel;
• folding the sheet around the forming mandrel by folding it along the weakening lines, so as to create, wrapped around the forming mandrel:
• two opposing front walls, parallel to each other and triangular in shape;
• and
• two opposing rectangular lateral walls, slanted towards a common vertex,
• sealing, while the sheet is wound on the forming mandrel, with a first and a second sealing to make a container having a single opening accessing a cavity delimited by the two front walls and by the two lateral walls,
• said first and second sealing being formed by joining corresponding inner faces of at least one among said front and/or lateral walls, so as to create a first and a second sealing fin, at least one among said first and second sealing fin being of peelable or tearable type, subsequently
• removing the container with said first and second sealing fin from the forming mandrel, so as to make the cavity accessible from said opening;
• filling the cavity with the product which is poured by dropping it through the access opening, and subsequently
• closing the container by means of a third final sealing formed by welding internal faces of two opposite end tails of the two front walls between each other and internal faces of two couple of opposite end tails of the lateral walls between each other, so as to create on a base wall a single base sealing third fin on a base wall opposite to the common vertex.