US Patent 7950850 Long packaging material for manufacturing pouch

An elongated packaging material (A1) for manufacturing a pouch comprises a first elongated flexible sheet (10), and a second elongated flexible sheet (10) layered on the first sheet. The side ends of the first and the second sheets are provided with a plurality of side sealing portions (2) extending lengthwise of the sheets. A plurality of cross sealing portions (3) are spaced from each other lengthwise of the sheets. Each of the side sealing portions is provided with a plurality of projecting portions (20), each projecting toward a center of the width of the sheets, between an adjacent pair of cross sealing portions.