Stand-up bag of a weldable foil for holding pourable contents

Abstract

A bag capable of moving between a flattened generally planar condition to an open generally parallelepipedal shape has in the flattened condition closely juxtaposed flat rectangular front and back face panels. A rectangular top panel has front and back edges joined to the top edges of the respective front and back face panels and side edges bridging ends of the respective front and back edges. The top panel has a crease between the respective front and back edges and is folded inward therefrom to lie between the face panels. A similar rectangular floor panel is secured to the lower edges of the face panels. A pair of rectangular side gusset panels each have vertical front and back edges respectively joined to the side edges of the front and back panels and upper and lower edges joined to the side edges of the top and bottom panels.

I claim: 
     
         1 . A bag capable of moving between a flattened generally planar condition to an open generally parallelepipedal shape, the bag comprising in the flattened condition:
 closely juxtaposed flat rectangular front and back face panels each having a horizontal top edge, a horizontal bottom edge therebelow, and a pair of horizontally spaced vertical side edges bridging ends of the top and bottom edges;   a rectangular top panel having front and back edges joined to the top edges of the respective front and back face panels and side edges bridging ends of the respective front and back edges, the top panel having a crease between the respective front and back edges and being folded inward therefrom to lie between the face panels;   a rectangular floor panel having front and back edges respectively joined to the bottom edges of the front and back panels and side edges bridging ends of the respective front and back edges, the floor panel having a crease between the respective front and back edges and being folded inward therefrom to lie between the face panels;   a pair of rectangular side gusset panels each having vertical front and back edges respectively joined to the side edges of the front and back panels and upper and lower edges joined to the side edges of the top and bottom panels, each side panel being subdivided by a central vertical crease into a pair of subpanels each formed at a respective corner of the side panel with a respective corner crease extending diagonally inward from the respective corner to the center crease and each defining at the respective corner a triangular gore, the side panel being folded inward at the respective center creases between the face panels and the gores being folded inward at the diagonal creases between the subpanels, the top, bottom, and side panels being wholly between the face panels in the flattened condition and extending generally perpendicular to the face panels in a filled condition of the bag.   
     
     
         2 . The bag defined in  claim 1 , wherein all the subpanels are of weldable sheet material and are secured together at the edges by weld seams. 
     
     
         3 . The bag defined in  claim 2 , wherein the end edges of the top and bottom panels are joined to the gores of the side panels. 
     
     
         4 . The bag defined in  claim 2 , further comprising
 a handle on one of the panels.   
     
     
         5 . The bag defined in  claim 2 , wherein at least one of the panels forms an opening, the bag further comprising:
 a reclosable closure on the opening.   
     
     
         6 . The bag defined in  claim 5 , wherein the opening and the closure are at a seam between the one of the face panels and the top panel. 
     
     
         7 . The bag defined in  claim 5 , wherein the opening is formed by a spout and the closure is a cap fittable on the spout. 
     
     
         8 . The bag defined in  claim 5 , wherein the closure is a slide fastener. 
     
     
         9 . The bag defined in  claim 5 , wherein the one panel has a flap that can cover the opening and the closure can hold the flap in a position covering the opening. 
     
     
         10 . The bag defined in  claim 5 , wherein the bag is formed outside the closure with a removable seam, whereby when the removal seam is removed the closure can close the opening. 
     
     
         11 . The bag defined in  claim 5 , further comprising
 a handle on a panel opposite the opening.   
     
     
         12 . The bag defined in  claim 11  wherein the handle is reinforced.