Light-blocking plastic bag

Abstract

A plastic bag for produce such as potatoes comprises first and second plastic walls peripherally bonded together. A central plastic wall is positioned between the first and second walls, being peripherally bonded to them. The central plastic wall is opaque to substantially block the passage of light therethrough. Thus, potato greening can be avoided while they are stored in the bag even under bright, fluorescent light.

1 . A plastic bag for produce such as potatoes, which comprises:
 first and second plastic walls, peripherally bonded together,   a central, plastic wall between said first and second walls, and peripherally bonded to said first and second walls, said central, plastic wall being opaque to substantially block the passage of light therethrough.   
     
     
         2 . The plastic bag of  claim 1  which defines an open end to receive produce such as potatoes. 
     
     
         3 . The plastic bag of  claim 1  which carries produce in a compartment defined between said second wall and the central, plastic wall, said first wall being translucent. 
     
     
         4 . The plastic bag of  claim 3  in which the central, plastic wall defines a light-colored layer facing the first wall, and a dark-colored layer to substantially block the passage of said light. 
     
     
         5 . The plastic bag of  claim 4  in which the light-colored layer and the dark-colored layer comprise a co-extrusion. 
     
     
         6 . The plastic bag of  claim 4  in which the light-colored layer and the dark-colored layer comprise separate sheets, peripherally joined together. 
     
     
         7 . The plastic bag of  claim 3  which is sealed on all sides. 
     
     
         8 . The plastic bag of  claim 7  which comprises ventilation apertures in the first and second sidewalls. 
     
     
         9 . The plastic bag of  claim 4  in which at least a portion of the second plastic wall is transparent, to permit viewing of the produce in the bag. 
     
     
         10 . The plastic bag of  claim 4  which contains potatoes. 
     
     
         11 . A plastic bag for produce, which comprises:
 first and second plastic walls, peripherally bonded together,   a central, plastic wall between said first and second walls and peripherally bonded to said first and second walls, said central plastic wall being colored to substantially block the passage of light therethrough, said plastic bag defining an open end to receive said produce, the central plastic wall defining a light-colored layer facing the first wall, and a dark-colored layer to substantially block the passage of light, facing the second wall.   
     
     
         12 . The plastic bag of  claim 11  in which the light-colored layer and the dark-colored layer comprise a co-extrusion. 
     
     
         13 . The plastic bag of  claim 11  in which the light-colored layer and the dark-colored layer comprise separate sheets, peripherally joined together. 
     
     
         14 . The plastic bag of  claim 11  which is sealed on all sides. 
     
     
         15 . The plastic bag of  claim 11  which comprises ventilation apertures in the first and second sidewalls. 
     
     
         16 . The plastic bag of  claim 11  which at least a portion of the second sidewall is transparent, to permit viewing of produce in the bag. 
     
     
         17 . The plastic bag of  claim 1  in which said opaque, central plastic wall comprises a dark-colored layer. 
     
     
         18 . The plastic bag of  claim 1  in which the opaque, central plastic wall comprises a dark-colored plastic sheet. 
     
     
         19 . The method for storing potatoes which comprises:
 inserting said potatoes into a plastic bag, which bag comprises: first and second plastic walls, and a central plastic wall between said first and second walls, said plastic walls being peripherally bonded together, said central plastic wall being opaque to substantially block the passage of light therethrough; enclosing said potatoes in said plastic bag between said second plastic wall and the central plastic wall; and storing said potatoes with the first plastic wall facing upwardly.   
     
     
         20 . The method of  claim 19  in which said first plastic wall is translucent, and the central plastic wall defines a light-colored layer facing the first wall and a dark-colored layer facing the second wall, to substantially block the passage of said light. 
     
     
         21 . The method of  claim 19  in which at least a portion of the second plastic wall is transparent, to permit viewing of the produce in said bag.