Four side seal packaging bag and preparation device and method thereof

A preparation device of a four side seal packaging bag, comprising:

• a film material conveying mechanism, configured to continuously convey a film material of a packaging bag along a length direction of the film material;
• a folding mechanism, comprising folding guides, configured to fold the film material conveyed by the film material conveying mechanism to form an upper film material, a lower film material, and two side accordion film materials of the packaging bag, wherein a structure of the four side seal packaging bag is formed;
• a cutting mechanism, configured to cut the upper film material formed by folding by the folding mechanism, along creases, to separate the upper film material from the lower film material and the side accordion film materials;
• punch-and-cut mechanisms, configured to form square punch-and-cut regions on the side accordion film materials separated from the upper film material and separate the square punch-and-cut regions from the side accordion film materials;
• a side accordion forming mechanism, configured to perform a further forming operation on the side accordion film materials after the square punch-and-cut regions are separated by the punch-and-cut mechanism;
• and
• a hot-sealing mechanism, configured to hot-seal the upper film material, the formed side accordion film materials, and the lower film material to form the four side seal packaging bag;
• wherein the punch-and-cut mechanisms each are provided with a punch-proof structure;
• the punch-proof structure is provided with a punch-proof pad and a punch-proof pad insertion structure;
• and the punch-proof pad is inserted between the side accordion film material and the lower film material through the punch-proof pad insertion structure, to prevent damage to the lower film material caused when the punch-and-cut mechanism punches and cuts off the square punch-and-cut region of the side accordion film material;
• the punch-and-cut mechanisms each are provided with a roll-to-cut structure;
• the roll-to-cut structure is provided with rolling cutters and a rolling cutter drive component;
• the rolling cutter drive component is connected to the rolling cutters to control roll-to-cut operation of the rolling cutters;
• the rolling cutters are located above the side accordion film material;
• and the rolling cutters roll-to-cut the side accordion film material in a direction perpendicular to a conveying direction of the side accordion film material to form punch-and-cut edges of the square punch-and-cut region;
• the punch-and-cut mechanisms each are provided with a punching structure;
• the punching structure is located downstream of the roll-to-cut structure and is provided with at least a punching head and a punching drive structure;
• and the punching head is configured to punch and cut off the square punch-and-cut region with the punch-and-cut edges through the punching drive structure, wherein the square punch-and-cut region is formed;
• and
• the punch-and-cut mechanisms each are provided with a gripping structure;
• the gripping structure is located downstream of the punching structure and is provided with a gripping end and a gripping end drive structure;
• and the gripping end is driven by the gripping end drive structure to grip the square punch-and-cut region punched and cut by the punching head.