Patent ID: 11926118
Assignee: TOTANI CORPORATION
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A method for making plastic bags, the method comprising:
superposing a first panel web and a second panel web on each other and feeding the first and second panel webs in a longitudinal direction of the first and second panel webs;
before superposing of the first and second panel webs, supplying a side gusset to the first or second panel web to dispose the side gusset in a width direction of the first and second panel webs, wherein the side gusset is interposed between the first and second panel webs when the first and second panel webs are superposed on each other, the side gusset being folded in halves on opposite sides with respect to a longitudinal centerline thereof;
after the superposing of the first and second panel webs, sealing the side gusset to the first and second panel webs to form temporary sealed sections;
after the superposing of the first and second panel webs, forming first perforations in the first panel web with a disk-shaped perforation cutter as the first and second panel webs are fed, the disk-shaped perforation cutter having cutting teeth over a circumference thereof and rotating as the first and second panel webs are fed, the first perforations comprising a line of slits extending in the longitudinal direction of the first and second panel webs;
after the superposing of the first and second panel webs, forming second perforations in the side gusset which has been interposed between the first and second panel webs, with the rotating disk-shaped perforation cutter when the side gusset passes through the rotating disk-shaped perforation cutter, the second perforations comprising a line of slits extending in a width direction of the side gusset;
after forming of the temporary sealed sections and the first and second perforations, guiding the first panel web as the first and second panel webs are fed, to divide the first panel web along the formed first perforations and to fold the first panel web on sides of division edges of the first panel web along fold lines extending in the longitudinal direction of the first and second panel webs;
cutting the side gusset open along the formed second perforations by means of guiding of the first panel web and the temporary sealed sections to form open surfaces;
supplying an end face web to the first panel web as the first and second panel webs are fed, to dispose the end face web in the longitudinal direction of the first and second panel webs so as to superpose the end face web on folded parts of the first panel web and the open surfaces of the side gusset; and
forming panel parts of bags from the first and second panel webs, side gusset parts of the bags from the side gusset, and end face parts of the bags from the end face web.