Long packaging material for manufacturing pouch

A roll of an elongated packaging material for manufacturing a plurality of pouches, comprising a series of unit pouch areas corresponding to the plurality of pouches and connected serially to each other along a length of the packaging material, the series of unit pouch areas comprising:

• a first elongated flexible sheet;
• a second elongated flexible sheet layered on the first sheet;
• a plurality of side sealing portions provided at side ends of each of the first and second sheets, the side sealing portions extending lengthwise of the first and second sheets;
• and
• a plurality of cross sealing portions spaced from each other lengthwise of the sheets, each two adjacent cross sealing portions defining therebetween a respective one of the unit pouch areas;
• wherein each of the side sealing portions is provided with a plurality of projecting portions before each unit pouch area is paid out from the roll, each of the projecting portions projecting toward a center of width of the first and second sheets, between an adjacent pair of the cross sealing portions;
• wherein each of the first and second elongated flexible sheets includes a first wider width portion between each said projecting portion and a first of the adjacent cross sealing portions, a narrower width portion at each said projecting portion, and a second wider width portion between each said projecting portion and a second of the adjacent cross sealing portions, before the unit pouch area is paid out from the roll;
• wherein each of the side sealing portions includes an inclined portion for connection to an adjacent cross sealing portion before the unit pouch area is paid out from the roll;
• and
• wherein each of the first wider width portion and the second wider portion has a wider inner width than the narrower width portion before the unit pouch are is paid out from the roll.