Bag for vacuum packaging

Abstract

A bag for vacuum packaging, comprising an inner layer, made of sealable material, and an outer layer that is substantially impermeable to gases, and at least one sheet element, which is positioned at least partially proximate to the opening of the bag so as to keep at least one portion of the inner layer spaced from at least one portion of at least one face of the at least one sheet element, in order to form air suction channels.

What is claimed is:  
     
         1 . A bag for vacuum packaging, comprising: an opening; an inner layer made of sealable material; an outer layer that is substantially impermeable to gases; air suction channels; and at least one sheet element, which is positioned at least partially proximate to the opening of said bag so as to keep at least one portion of said inner layer spaced from at least one portion of at least one face of said at least one sheet element in order to form said air suction channels.  
     
     
         2 . The bag for vacuum packaging of  claim 1 , wherein said sheet element is arranged at the opening of the bag so as to keep at least one portion of both faces of the sheet element spaced from a respective portion of said inner layer.  
     
     
         3 . The bag for vacuum packaging of  claim 2 , wherein said at least one sheet element comprises any of a plurality of protrusions and convexities on said at least one portion of said at least one face thereof.  
     
     
         4 . The bag for vacuum packaging of  claim 2 , wherein said at least one sheet element has a substantially undulated structure.  
     
     
         5 . The bag of  claim 1 , comprising a first wall and a second wall, including each at least one inner layer made of sealable material, and at least one outer layer which is arranged outside said at least one inner layer, said outer layer being connected to said inner layer and being made of a material that is substantially impermeable to gases, said first and second walls being connected at a substantially perimetric portion thereof, said at least one sheet element being interposed between said first and second walls.  
     
     
         6 . The bag according of  claim 1 , wherein said at least one sheet element comprises a film made of sealable material.  
     
     
         7 . The bag of  claim 6 , wherein said at least one sheet element is fixed to said inner layer at least at a region that is proximate to the opening of said bag.  
     
     
         8 . The bag of  claim 7 , wherein said at least one sheet element is fixed to said inner layer by means of a food-safe adhesive.  
     
     
         9 . The bag of  claim 7 , wherein said at least one sheet element has a plurality of micro-openings.  
     
     
         10 . The bag of  claim 9 , wherein each one of said plurality of micro-openings is conical.  
     
     
         11 . The bag of  claim 6 , wherein said sealable material is selected from a group comprising polypropylene, polythene and polyethylene.  
     
     
         12 . The bag of  claim 11 , wherein said substantially gas-impermeable material is selected from a group comprising polyester and polyamide.  
     
     
         13 . A tubular element for obtaining a vacuum packing bag, having the features set forth in  claim 1 .  
     
     
         14 . The tubular element of  claim 13 , wherein the outer and inner layers form respective first and second bag walls, said bag walls being constituted, respectively, by a first and a second flat element, said flat elements being substantially rectangular and joined at opposite long sides thereof, said sheet element being interposed between said two flat elements.  
     
     
         15 . The tubular element of  claim 14 , being constituted by at least one segment of preset length cut from a tubular length of material, said segment being sealed at one end thereof in order to provide said bag with said opening.