Production method for pleated film, and production method of pleated packaging body

A production method for a pleated film, comprising:

• a fixing step for moving an elongated film for use as a packaging body in a longitudinal direction of the film and fixing the film to a pair of pleat-forming plates disposed with a gap therebetween;
• an introduction step for introducing the film into a gap part between the pair of pleat-forming plates so that an upstream-side inner surface and a downstream-side inner surface of the film oppose each other while closing the gap between the pair of pleat-forming plates;
• a pleat-forming step for forming a pleat extending in a latitudinal direction of the film by closing the gap between the pair of pleat-forming plates;
• and
• a step for cutting out a portion of the film in a part where the pleat is to be formed using a die or a blade following the pleat-forming step,
• wherein:
• sealing bars are provided on the pair of pleat-forming plates on opposing surfaces of the pair of pleat-forming plates, and
• the introduction step is performed using a following method (A) and/or the following method (B):
• (A) a method in which the film is introduced into the gap between the pair of pleat-forming plates so that the upstream-side inner surface and the downstream-side inner surface of the film oppose each other by blowing air from an inner surface side of the film;
• and
• (B) a method in which the film is introduced into the gap between the pair of pleat-forming plates so that the upstream-side inner surface and the downstream-side inner surface of the film oppose each other by suctioning gas from the atmosphere through a suction member disposed on an outer surface side of the gap part between the pair of pleat-forming plates.

A production method for a pleated film, comprising:

• an introduction step for moving an elongated film for use as a packaging body in a longitudinal direction of the film and introducing the film into a gap part between a pair of pleat-forming plates disposed with a gap therebetween so that an upstream-side inner surface and a downstream-side inner surface of the film oppose each other;
• a fixing step for fixing the film to the pair of pleat-forming plates;
• and
• a pleat-forming step for forming a pleat extending in a latitudinal direction of the film by closing the gap between the pair of pleat-forming plates,
• wherein:
• sealing bars are provided on the pair of pleat-forming plates on opposing surfaces of the pair of pleat-forming plates,
• while forming the pleat extending in the latitudinal direction of the film by closing the gap between the pair of pleat-forming plates in the pleat-forming step, a portion of the film in a part where the pleat is to be formed is cut out using a die or a blade disposed on a part of one of the sealing bars, and
• the introduction step is performed using one or more of the following methods (A) to (C):
• (A) a method in which the film is introduced into the gap between the pair of pleat-forming plates so that the upstream-side inner surface and the downstream-side inner surface of the film oppose each other by blowing air from an inner surface side of the film;
• (B) a method in which the film is introduced into the gap between the pair of pleat-forming plates so that the upstream-side inner surface and the downstream-side inner surface of the film oppose each other by suctioning gas from the atmosphere through a suction member disposed on an outer surface side of the gap part between the pair of pleat-forming plates;
• and
• (C) a method in which the film is introduced into the gap between the pair of pleat-forming plates so that the upstream-side inner surface and the downstream-side inner surface of the film oppose each other by a pair of rollers disposed on an outer surface side of the film.

A production method for a pleated film, comprising:

• a fixing step for moving an elongated film for use as a packaging body in a longitudinal direction of the film and fixing the film to a pair of pleat-forming plates disposed with a gap therebetween;
• an introduction step for introducing the film into a gap part between the pair of pleat-forming plates so that an upstream-side inner surface and a downstream-side inner surface of the film oppose each other while closing the gap between the pair of pleat-forming plates;
• and
• a pleat-forming step for forming a pleat extending in a latitudinal direction of the film by closing the gap between the pair of pleat-forming plates,
• wherein:
• sealing bars are provided on the pair of pleat-forming plates on opposing surfaces of the pair of pleat-forming plates,
• while forming the pleat extending in the latitudinal direction of the film by closing the gap between the pair of pleat-forming plates in the pleat-forming step, a portion of the film in a part where the pleat is to be formed is cut out using a die or a blade disposed on a part of one of the sealing bars, and
• the introduction step is performed using the following method (A) and/or the following method (B):
• (A) a method in which the film is introduced into the gap between the pair of pleat-forming plates so that the upstream-side inner surface and the downstream-side inner surface of the film oppose each other by blowing air from an inner surface side of the film;
• and
• (B) a method in which the film is introduced into the gap between the pair of pleat-forming plates so that the upstream-side inner surface and the downstream-side inner surface of the film oppose each other by suctioning gas from the atmosphere through a suction member disposed on an outer surface side of the gap part between the pair of pleat-forming plates.