Single-dose sealed pack with break opening

Abstract

A single-dose sealed pack with break opening having a first sheet of semi-rigid plastic material, and a second sheet of flexible plastic material, to define a sealed chamber for containing a dose of a product, the first sheet including a bearing layer and a barrier layer, wherein the barrier layer is arranged towards the outside of the chamber with respect to the bearing layer. The single-dose pack also having a first cut on the inner face of the first sheet to guide the breakage of the first sheet form an opening to allow product to exit, the first cut having a section defining the bending axis of the pack, the barrier layer being of the isotropic and not perforated type and having a lower elongation at break than the maximum elongation applicable to it by the only thickness of the bearing layer following the bending of the pack itself.

1 . Single-dose sealed pack ( 1 ) with break opening comprising:
 a first sheet ( 2 ) of semi-rigid plastic material;   a second sheet ( 3 ) of flexible plastic material associated with said first sheet ( 2 ), to define a sealed containment chamber ( 4 ) for containing at least a dose of a product;   said first sheet ( 2 ) comprising at least a bearing layer ( 6 ) and at least a barrier layer ( 7 ), each of them having its own thickness, wherein said barrier layer ( 7 ) is arranged towards the outside of said chamber ( 4 ) with respect to said bearing layer ( 6 ),   wherein it comprises at least a first cut ( 5   a ) defined at least on the inner face of said first sheet ( 2 ) to guide the breakage of the first sheet itself so as to determine the formation of an opening to allow the product to come out, said first cut ( 5   a ) comprising an individual rectilinear section defining the bending axis of the pack, and wherein said barrier layer ( 7 ) is of the isotropic and not perforated type and has a lower elongation at break than the maximum elongation applicable to it by the only thickness of said bearing layer ( 6 ) following the bending of the pack itself.   
     
     
         2 . A pack ( 1 ) according to  claim 1 , wherein the elongation at break of said barrier layer ( 7 ) is less than double the thickness of said bearing layer ( 6 ). 
     
     
         3 . A pack ( 1 ) according to  claim 1 , wherein said bearing layer ( 6 ) is of the fragile type. 
     
     
         4 . A pack ( 1 ) according to  claim 1 , wherein said bearing layer ( 6 ) has a thickness between 150 μm and 500 μm. 
     
     
         5 . A pack ( 1 ) according to  claim 1 , wherein said barrier layer ( 7 ) has a thickness between 5 μm and 15 μm. 
     
     
         6 . A pack ( 1 ) according to  claim 1 , wherein the tensile strength (σ R ) of said barrier layer ( 7 ) is below the maximum tension applicable to it by the thickness of said bearing layer ( 6 ). 
     
     
         7 . A pack ( 1 ) according to  claim 1 , wherein said first sheet ( 2 ) comprises at least a sealing layer ( 8 ) associated with said bearing layer ( 6 ) and turned towards the inside of said chamber ( 4 ) with respect to the bearing layer itself. 
     
     
         8 . A pack ( 1 ) according to  claim 7 , wherein said sealing layer ( 8 ) is made of a material having greater elongation at break than said bearing layer ( 6 ). 
     
     
         9 . A pack ( 1 ) according to  claim 7 , wherein said sealing layer ( 8 ) has a thickness between 10 μm and 70 μm. 
     
     
         10 . A pack ( 1 ) according to  claim 1 , wherein said first cut ( 5   a ) involves said bearing layer ( 6 ) and does not intercepts said barrier layer ( 7 ). 
     
     
         11 . A pack ( 1 ) according to  claim 10 , wherein said first cut ( 5   a ) also involves said sealing layer ( 8 ). 
     
     
         12 . A pack ( 1 ) according to  claim 1 , wherein said first sheet ( 2 ) comprises at least a protective layer ( 9 ) associated with said barrier layer ( 7 ) and turned outwards. 
     
     
         13 . A pack ( 1 ) according to  claim 12 , wherein said protective layer ( 9 ) has a lower elongation at break than the maximum elongation applicable to it at least by the thickness of said bearing layer ( 6 ) and of said barrier layer ( 7 ). 
     
     
         14 . A pack ( 1 ) according to  claim 12 , wherein said first sheet ( 2 ) comprises said protective layer ( 9 ) and said sealing layer ( 8 ) which define the outer face and the inner face respectively, of the first sheet itself. 
     
     
         15 . A pack ( 1 ) according to  claim 12 , wherein it comprises at least a second cut ( 10   a ) defined on said protective layer ( 9 ). 
     
     
         16 . A pack ( 1 ) according to  claim 15 , wherein at least one between said first and said second cuts ( 5   a ,  10   a ) extends transversally to the longitudinal axis of said first sheet ( 2 ). 
     
     
         17 . A pack ( 1 ) according to  claim 16 , wherein it comprises at least a pair of further cuts ( 5   b,    10   b ) defined in correspondence to the extremities of at least one between said first and said second cuts ( 5   a,    10   a ), said further cuts being arranged transversal to the extension of the first and/or second cut itself. 
     
     
         18 . A pack ( 1 ) according to  claim 15 , wherein said second cut ( 10   a ) is substantially superimposed on said first cut ( 5   a ). 
     
     
         19 . A pack ( 1 ) according to  claim 12 , wherein said first sheet ( 2 ) comprises at least a pair of punches ( 11 ) defined on said protective layer ( 9 ) on opposite sides of its longitudinal median plane.