Lid with barrier property

Abstract

The invention relates to a lid with barrier property having highly improved barrier property, sealing ability for cups, and ease of opening in comparison with the conventional products. The innermost layer is a resin layer including a polyethylene sealant layer, and a metal foil layer is attached to the outside of the resin layer of the innermost layer via an adhesive layer. The innermost layer is provided with a plurality of weakened portions extending radially from the center. The weakened portions facilitate tearing the innermost layer and also the metal foil layer, thereby facilitating opening of the lid.

1 . A lid comprising:
 a resin layer that is an innermost layer, the resin layer comprising a polyethylene sealant layer;   a metal foil layer that is attached to an outside of the innermost layer via an adhesive layer; and   the innermost layer is provided with a plurality of weakened portions that extend radially from a center thereof.   
     
     
         2 . The lid according to  claim 1 , wherein the weakened portions allow the innermost layer and the metal foil layer to be torn, facilitating opening the lid. 
     
     
         3 . The lid according to  claim 1 , wherein the weakened portions are either perforations or cutting lines. 
     
     
         4 . The lid according to  claim 1 , wherein there are at least three weakened portions and the weakened portions are circumferentially arranged to produce a same central angle around a central point. 
     
     
         5 . The lid according to  claim 1  wherein the innermost layer comprises two inner layers:
 one polyethylene sealant layer that is a lowermost inner layer; and 
 one extruded polyethylene resin layer positioned on the lowermost inner layer. 
 
     
     
         6 . The lid according to  claim 1 , wherein the metal foil layer comprises two inner layers:
 one of resin layer as a lowermost inner layer; and   one of metal foil provided on said lowermost inner layer.   
     
     
         7 . The lid according to  claim 1 , comprising an intermediate paper layer between the innermost layer and the metal foil layer.