Patent ID: 8317670
Filing Date: 2012-11-27
Classification: B31B,B65D

Abstract:
1. A method of making tri-fold side-seamed plastic produce bags, comprising the steps of: extruding a continuous tube of plastic film; flattening said tube, said tube having an upper surface, a lower surface, first and second side edges; winding said flattened tube onto a core; moving said core to a cutting machine, said cutting machine including a slitter; feeding said tube from said core into said cutting machine; slitting said upper surface to remove a strip of plastic material to form a cut, said cut having a first side and a second side, said first and second sides being parallel to said first and second side edges of said tube; removing said strip; forming a perforation perpendicular to said first and second side edges across an entire width of said tube; sealing said tube at a first side seam spaced from and parallel to said perforation; sealing said tube at a second side seam, said second side seam being spaced from and parallel to said first side seam; cutting said lower surface at a point below and between said first and second sides of said cut in said upper surface to form two facing bag streams, each of said bag streams having a first predetermined width; and folding each of said bag streams to approximately one third of said first predetermined width.