Method for production of bags for the transport and storage of bulk goods or liquids, and bag obtained according to the method

Method for production of bags for the transport and storage of bulk goods or liquids, wherein use is made of tubular fabric cut into several pieces, which are then assembled together, comprising the steps of:

• providing a tubular fabric;
• flattening said tubular fabric to form a first double-thickness fabric having two opposite sides, respectively an internal side and an external side, extending between two flattened edges;
• folding-in or pleating a first of the flattened edges of said double-thickness fabric to form a first gusset, said first gusset being defined by a first oblique section extending between said folded-in flattened edge and a first gusset end positioned on the external side of the first double-thickness fabric and by a second oblique section extending between said folded-in flattened edge and a second gusset end positioned on the internal side of the first double-thickness fabric;
• folding-in or pleating the second of the flattened edges in a manner symmetric to said first edge,
• cutting said tubular fabric into pieces and assembling said pieces to form a bag,
• wherein the assembly of two said pieces comprises the steps of:
• disposing the first and the second pieces such that the external side of the second piece is in contact with or close to the internal side of the first piece and such that the first, second, third and fourth gusset ends of said pieces are substantially aligned;
• assembling the first and second pieces by means of seams formed around or near the first to fourth gusset ends.