Bag for the containing of gas-producing liquid products, in particular yeast

Abstract

Bag for containing liquid products which produce gas, in particular yeast, of the double wall type, includes two opposite faces ( 2 ) joined one to the other along a perimeter heat-sealing line ( 3 ) and a spout ( 7 ) for delivering the liquid product placed on one of these faces ( 2 ), the double wall of the bag including a high permeability inner film ( 5 ) and a reinforcing outer film ( 6 ), wherein at least in the upper part of each of the two opposite faces ( 2 ) of the bag ( 1 ), between the inner film ( 5 ) and the outer film ( 6 ) at least one spacer element ( 10 ) is provided, attached to the outer film ( 6 ) at one at least opening ( 19 ) formed therein and provided with holes ( 17 ) for the release of the gases which permeate through the inner film ( 5 ).

1 . Bag for containing liquid products which produce gas, in particular yeast, of the double wall type, comprising two opposite faces ( 2 ) joined one to the other along a perimeter heat-sealing line ( 3 ) and a spout ( 7 ) for filling/delivering the liquid product placed on one of these faces ( 2 ), the double wall of the bag comprising a high permeability inner film ( 5 ) and a reinforcing outer film ( 6 ), characterised in that at least in the upper part of each of said two opposite faces ( 2 ) of the bag ( 1 ), between said inner film ( 5 ) and said outer film ( 6 ), at least one spacer element ( 10 ) is provided, attached to the outer film ( 6 ) at one at least opening ( 19 ) formed therein and provided with holes ( 17 ) for the release of the gases which permeate through said inner film ( 5 ). 
     
     
         2 . Bag according to  claim 1 , characterised in that said spacer element ( 10 ) comprises a base body ( 11 ) provided with said holes ( 17 ), having a perimeter edge ( 14 ) sealed to the outer film ( 6 ) so as to enclose said at least one opening ( 19 ) in the film ( 6 ). 
     
     
         3 . Bag according to  claim 2 , characterised in that said holes ( 17 ) are formed both in the base ( 15 ) and in the side wall of said base body ( 11 ). 
     
     
         4 . Bag according to  claim 2 , characterised in that it further comprises a cap ( 13 ) provided with holes ( 18 ,  28 ), housed in a seat ( 12 ) of said base body ( 11 ). 
     
     
         5 . Bag according to  claim 1 , characterised in that said inner film ( 5 ) is based on polyethylene and said outer film ( 6 ) contains at least one layer of OPA (nylon). 
     
     
         6 . Bag according to  claim 5 , characterised in that said outer film ( 6 ) is a laminate comprising at least one intermediate layer of OPA sandwiched between polyethylene-based outer layers. 
     
     
         7 . Bag according to  claim 6 , characterised in that said laminate of the outer film ( 6 ) comprises: a first layer of coextruded LLDPE-EVA, a second layer of OPA and a third layer of coextruded LLDPE-EVA. 
     
     
         8 . Bag according to  claim 7 , wherein the layers of the laminate of the outer film have the following thicknesses and weights:
 coextruded LLDPE-EVA, 38 μm; 35 g/m 2 ;   OPA (nylon), 15 μm; 17 g/m 2 ;   coextruded LLDPE-EVA, 38 μm; 35 g/m 2 .   
     
     
         9 . Bag according to  claim 5 , characterised in that said inner film ( 5 ) is a LLDPE coextruded of 30 μm and 28 g/m 2 . 
     
     
         10 . Bag according to  claim 1 , characterised in that said outer film ( 6 ) is perforated. 
     
     
         11 . Bag according to  claim 3 , characterised in that it further comprises a cap ( 13 ) provided with holes ( 18 ,  28 ), housed in a seat ( 12 ) of said base body ( 11 ).