Foldable carton

In a foldable tray-like carton for storing, microwave cooking and serving of a food product, said carton being formed from a one-piece paperboard sheet having a polygonal bottom panel;

• a pair of opposed side panels and a pair of opposed end panels foldably joined to each edge of said bottom panel to extend completely around the periphery of said bottom panel;
• side web means foldably joining said side panels to said end panels in a continuous band and including fold lines positioned for folding of said side panels and end panels to an elevated position relative to said bottom panel to provide a liquid impervious tray;
• and a pair of opposed side extension panels foldably joined to an outer periphery of each of said side panels and a pair of opposed end extension panels foldably joined to an outer periphery of each of said end panels for folding to an inward position relative to said side panels and said end panels when said side panels and said end panels are elevated with respect to said bottom panel;
• the improvement in said carton comprising:
• extension web means foldable connecting each of the side extension panels to said end extension panels and forming with said side extension panels and said end extension panels a continuous band completely encircling said outer periphery of said side panels and said end panels;
• said side web means and said extension web means being substantially aligned and extending outwardly from each of the corners of said polygonal bottom panel;
• and
• said side web means and said extension web means defining an opening therebetween, said opening extending over substantially the entire length of the outer peripheral edge of said side web means.

In a carton formed from a one-piece paperboard blank, said carton having a rectangular bottom panel, two side panels and two end panels foldably joined to the four edges of said bottom panel and upwardly elevated from said bottom panel, four side web assemblies foldably joining adjacent ends of said side panels to said end panels to form a continuous water impervious tray-like structure with said bottom panel, said four side web assemblies being folded to an interior of said carton and secured against said side panels;

• two side extension panels and two end extension panels foldably joined to said side panels and said end panels respectively, and folded inwardly from said side panels and end panels to a folded position substantially parallel to said bottom panel;
• the improvement in said carton comprising:
• four extension web assemblies foldably joining adjacent ends of said side extension panels to said end extension panels form a continuous band around said carton, said extension web assemblies being folded to the interior of said carton and having one portion thereof secured to said side extension panels and another portion free to move to enable said side extension panels and said end extension panels to pop-up from said folded position to an elevated position over said side panels and said end panels;
• and
• relief openings at each corner of said carton positioned between said side web assemblies and said extension web assemblies and having an area sufficient to enable folding of said side extension panels and said end extension panels to said folded position.