Stand-up plastic storage bag with reinforced bottom gusset

A method for forming stand-up plastic food storage bags comprising:

• coextruding a monolayer plastic panel film and two monolayer plastic gusset floor reinforcement layers, wherein the monolayer plastic gusset floor reinforcement layers comprise two parallel strips spaced apart by at least about 0.25 cm on the panel film, lengthwise in a direction of coextrusion;
• folding the monolayer plastic panel film lengthwise to form a lengthwise fold line between the two monolayer plastic gusset floor reinforcement layers;
• forming a gusset in the area of the lengthwise fold line;
• forming seals in the plastic panel film in a direction perpendicular to the lengthwise fold line to define individual bag segments;
• and
• cutting the plastic panel film at the seals to form individual stand-up plastic food storage bags, each comprising:
• a front panel, a rear panel, and a bag mouth at top edges of the front and rear panels;
• a front bottom gusset wall and a rear bottom gusset wall disposed between the front and rear panels at the bottom of the front and rear panels;
• a folding seam defining abutment of the front bottom gusset wall to the rear bottom gusset wall;
• and
• a front bottom gusset wall reinforcement layer on an external surface of the front bottom gusset wall, and a rear bottom gusset wall reinforcement layer on an external surface of the rear bottom gusset wall;
• wherein the bottom gusset wall reinforcement layers terminate at least about 0.25 cm away from the folding seam defining abutment between the bottom gusset walls, and the bottom gusset wall reinforcement layers do not cover the folding seam defining abutment of the front bottom gusset wall to the rear bottom gusset wall.