Vertical bag-making/filling/packaging machine, manufacturing method of film packaging bag with content, and film packaging bag with content

A vertical bag-making/filling/packaging machine, comprising:

• a top folding portion which forms a first fold by folding a side of a band-shaped film into a Z-shape;
• a bottom folding portion which forms a second fold by folding a center of the film into an M-shape;
• a top seal portion which forms a top gusset and a spout portion protruding from the top gusset by heat-welding the first fold and side edges of the film so as to make the film into a tube shape;
• and
• a bottom-seal portion which forms a bottom gusset by heat-welding the second fold,
• wherein the top folding portion comprises an auxiliary top seal portion which heat-welds a mountain fold of the first fold to form a seal over a longitudinal direction of the first fold, and the seal is formed to have an arc shape with a center in the longitudinal direction.

A method of manufacturing a film packaging bag with contents, comprising:

• a top folding step in which a first fold is formed by folding a side of a band-shaped film into a Z-shape;
• a bottom folding step in which a second fold is formed by folding a center of the film into an M-shape;
• a top seal step in which a top gusset and a spout portion protruding from the top gusset are formed by heat-welding the first fold and side edges of the film so as to make the film into a tube shape;
• a bottom seal step in which a bottom gusset is formed by heat-welding the second fold;
• a conveying step for conveying the film downstream from the bottom-seal portion;
• a filling step for continuously distributing a content into an inside of the film;
• a correcting step for correcting a filled shape of the film by sandwiching the film by the correcting portion in a front-back direction;
• a squeezing step for pressing and squeezing the film in the front-back direction with a squeezing roller portion disposed upstream to the correcting portion;
• a side seal step for forming a bag body by heat-welding the film in a lateral direction with the side-seal portion disposed downstream from the correcting portion;
• and
• a cutting-off step for cutting off the bag body from the film by a cutter portion,
• wherein, in the correcting step, a first pair of correcting plates is brought into close contact with a portion extending from the bottom gusset to the top gusset, and at the same time, a second pair of correcting plates is brought into close contact with a portion extending from the top gusset to the spout portion.

A method of manufacturing a film packaging bag with contents, comprising:

• a top folding step in which a first fold is formed by folding a side of a band-shaped film into a Z-shape;
• a bottom folding step in which a second fold is formed by folding a center of the film into an M-shape;
• and
• a top seal step in which a top gusset and a spout portion protruding from the top gusset are formed by heat-welding the first fold and side edges of the film so as to make the film into a tube shape,
• wherein the top folding step comprises an auxiliary top seal step in which a seal is formed over the longitudinal direction of a mountain fold of the first fold, and the seal is formed to have an arc shape with a center in the longitudinal direction.

A film packaging bag with contents made by filling and enclosing a fluid in the film packaging bag, comprising:

• a top gusset in which films on a top surface of the film packaging bag overlap in an M-shape;
• a bottom gusset in which films on a bottom surface of the film packaging bag overlap in the M-shape;
• and
• a spout portion disposed on a top on one of two pleats of the top gusset,
• wherein, the two pleats include a first pleat and a second pleat, the spout portion being disposed on the second pleat,
• the first pleat has a seal which is formed by heat-welding the top of the first pleat over a longitudinal direction, and
• the seal has an arc shape with a center in the longitudinal direction.