Vertical filling and packaging machine and method of manufacturing packaging bag with content

A vertical filling and packaging machine comprising:

• a bag-making guide that forms a cylindrical film by folding a sheet-like film fed downwardly in a center of a width thereof to overlap width direction ends of the film with each other;
• a vertical seal device that forms a vertical seal part by performing heat-sealing to a side of an overlapping part of the cylindrical film, or to each of a side of a folding part and the side of the overlapping part of the cylindrical film, said vertical seal device being disposed under said bag-making guide;
• plural pairs of guide rollers that rotate sandwiching the side of the folding part and the side of the overlapping part of the cylindrical film fed downwardly;
• a pair of ironing rollers that form an empty portion in the cylindrical film by rotating while sandwiching the cylindrical film in which content has been injected to feed the cylindrical film downwardly, said ironing rollers being disposed under said vertical seal device;
• a lateral seal device that performs heat-sealing over a full width in a lateral direction of the empty portion of the cylindrical film to form a lateral seal part, and that cuts off the cylindrical film at the lateral seal part, said lateral seal device being disposed under said pair of ironing rollers;
• a tension device that is disposed near a position of said ironing rollers and that pulls both sides of the cylindrical film laterally outward;
• and
• injection means that injects content into the cylindrical film, said injection means having an outlet for the content provided above the position of said ironing rollers, wherein
• said tension device pulls both sides of the cylindrical film laterally outward to flatten a portion sandwiched by the ironing rollers of the cylindrical film before said pair of ironing rollers sandwich the cylindrical film into which the content has been injected.