Patent ID: 7699765

Claim:
A method of making a bag in a continuous in-line process; the method comprising: (a) continuously advancing a web including a first layer on top of a second layer of polymeric film along a processing line, and while the web is advancing: (i) sealing a portion of the first layer and second layer together to result in a seal region having a seal region edge; (ii) based on a predetermined time from the sealing step, applying a perforation line to the web adjacent to the seal region to result in a perforated line having a perforation edge; (iii) taking an image of the seal region and perforated line; (iv) using the image, counting pixels between the seal region edge and the perforation edge to result in an actual pixel count; (v) calculating a pixel count error by subtracting the actual pixel count from a predetermined pixel count setpoint; and (b) repeating steps (i)-(v) and adjusting the predetermined time of step (ii) based on the pixel count error.