Sealing cover having opening tap for containers and method for manufacturing the same

Abstract

Disclosed herein are a sealing cover having an opening tap for containers and a method for manufacturing the sealing cover. The sealing cover includes a tapforming layer which is provided with the opening tap, and a sealing layer which is formed under the tap-forming layer and has a function of substantially sealing the container.

What is claimed is: 
     
         1 . A sealing cover having an opening tap for a container, comprising:
 a tap-forming layer provided with the opening tap; and   a sealing layer formed under the tap-forming layer, the sealing layer having a function of substantially sealing the container.   
     
     
         2 . The sealing cover as set forth in  claim 1 , further comprising
 an intermediate substrate layer interposed between the tap-forming layer and the sealing layer, the intermediate substrate layer providing a close contact function and a shock absorbing function when a cap is coupled to the container.   
     
     
         3 . The sealing cover as set forth in  claim 2 , wherein the sealing layer comprises:
 an aluminum foil layer isolating an interior of the container from an exterior thereof, the aluminum foil layer generating heat through high-frequency induction heating; and   a heat-sealing resin layer provided under the aluminum foil layer, the heat-sealing resin layer being adhered to the container by heat generated from the aluminum foil layer.   
     
     
         4 . The sealing cover as set forth in  claim 3 , wherein a thickness of the aluminum foil layer ranges from 0.009 mm to 0.05 mm. 
     
     
         5 . The sealing cover as set forth in  claim 4 , wherein the heat-sealing resin layer is made of one among polyolefin, EVA (ethylene vinyl acetate), EMA (ethylene methacrylic acid) and ionomer depending on a material of the container so as to provide an easy peel seal function. 
     
     
         6 . The sealing cover as set forth in  claim 5 , wherein a thickness of the heat-sealing resin layer ranges from 0.03 mm to 0.1 mm. 
     
     
         7 . The sealing cover as set forth in  claim 6 , wherein the heat-sealing resin layer comprises a film produced by a blown film method or is formed by an extrusion coating method. 
     
     
         8 . The sealing cover as set forth in  claim 3 , wherein a lower surface of the intermediate substrate layer and the aluminum foil layer provided in an upper portion of the sealing layer are adhered to each other by a dry lamination method using a solvent-based urethane adhesive or by an extrusion lamination method of melting a raw material containing polyethylene, EVA (ethylene vinyl acetate) or EMAA (ethylene-methacrylic acid-acrylate) and extrusion-laminating. 
     
     
         9 . The sealing cover as set forth in  claim 1 , wherein the tap-forming layer comprises:
 a surface layer formed of a PET (polyethylene terephthalate) or PP (polypropylene) film having no heat adhesive property, the surface layer having a thickness ranging from 0.012 mm to 0.05 mm, an inner or outer surface of the surface layer being printed by a gravure process;   a first heat-adhesive resin layer formed under a lower surface of the surface layer;   a folded film layer provided under a lower surface of the first heat-adhesive resin layer so as to form the opening tap, the folded film layer having a thickness ranging from 0.012 mm to 0.05 mm and being made of a PET (polyethylene terephthalate) or PP (polypropylene) film having no heat adhesive property, the folded film layer having a band shape formed in such a way that the PET or PP film folds double; and   a second heat-adhesive resin layer adhering both to a lower surface of the folded film layer and to the first heat-adhesive resin layer that is exposed to an area other than the folded film layer.   
     
     
         10 . The sealing cover as set forth in  claim 9 , wherein the folded film layer forms the opening tap using a structure in which when the folded film layer is cut into a size capable of being inserted into a cap, inner surfaces of the folded film layer that face each other do not adhere to each other. 
     
     
         11 . The sealing cover as set forth in  claim 9 , wherein the folded film layer is folded double on one side or both sides thereof. 
     
     
         12 . The sealing cover as set forth in  claim 9 , wherein the folded film layer is folded double in such a way that a cylindrical film roll is pressed to be flat. 
     
     
         13 . The sealing cover as set forth in  claim 9 , wherein the first heat-adhesive resin layer and the second heat-adhesive resin layer are formed by an extrusion lamination method and are made of any one among EVA (ethylene vinyl acetate), EMAA (ethylene-methacrylic acid-acrylate) and polyolefin-based adhesive resin containing polyethylene. 
     
     
         14 . The sealing cover as set forth in  claim 13 , wherein the first heat-adhesive resin layer and the second heat-adhesive resin layer are made of ethylene-methacrylic acid-acrylate terpolymer resin which is produced by DuPont Inc. and sold in a brand name “Nucrel” that is able to adhere to the PET or PP film without conducting a separate chemical primer process. 
     
     
         15 . A method for manufacturing a sealing cover for a container, the sealing cover comprising: a tap-forming layer provided with an opening tap; and a sealing layer formed under the tap-forming layer, the sealing layer having a function of substantially sealing the container, the method comprising:
 preparing a folded film layer formed by folding a PET (polyethylene terephthalate) or PP (polypropylene) film double, the PET or PP film having no heat adhesive property and having a thickness ranging from 0.012 mm to 0.05 mm;   preparing a surface layer made of a PET or PP film having no heat adhesive property, the surface layer having a thickness ranging from 0.012 mm to 0.05 mm, an inner or outer surface of the surface layer being printed by a gravure method;   preparing a sealing layer to be adhered to the container to isolate an interior of the container from an exterior thereof;   a first adhesion operation of adhering the surface layer to an upper surface of the folded film layer using a first heat-adhesive resin layer;   a second adhesion operation, using a second heat-adhesive resin layer, of adhering the sealing layer both to a lower surface of the folded film layer and to a portion of the first heat-adhesive resin layer that is other than the lower surface of the folded film layer; and   cutting an output of the second adhesion operation such that a portion of a side of the folded film layer is removed, and forming the opening tap using a portion of the folded film layer.   
     
     
         16 . The method as set forth in  claim 15 , wherein the first heat-adhesive resin layer is formed by an extrusion lamination method of melting adhesive resin and extrusion-adhering the surface layer to the folded film layer. 
     
     
         17 . The method as set forth in  claim 16 , wherein the second heat-adhesive resin layer is formed by an extrusion lamination method of melting adhesive resin equal to the adhesive resin forming the first heat-adhesive resin layer and extrusion-adhering the sealing layer both to the lower surface of the folded film layer and to the portion of the first heat-adhesive resin layer that is other than the lower surface of the folded film layer. 
     
     
         18 . The method as set forth in  claim 15 , wherein the folded film layer forms the opening tap using a structure in which when the folded film layer is cut into a size capable of being inserted into a cap, inner surfaces of the folded film layer that face each other do not adhere to each other. 
     
     
         19 . The method as set forth in  claim 15 , wherein the folded film layer is folded double on one side or both sides thereof 
     
     
         20 . The method as set forth in  claim 15 , wherein the folded film layer is folded double in such a way that a cylindrical film roll is pressed to be flat. 
     
     
         21 . The method as set forth in  claim 15 , wherein the first heat-adhesive resin layer and the second heat-adhesive resin layer are made of any one among EVA (ethylene vinyl acetate), EMAA (ethylene-methacrylic acid-acrylate) and polyolefin-based adhesive resin containing polyethylene. 
     
     
         22 . The sealing cover as set forth in  claim 21 , wherein the first heat-adhesive resin layer and the second heat-adhesive resin layer are made of ethylene-methacrylic acid-acrylate terpolymer resin which is produced by DuPont Inc. and sold in a brand name “Nucrel” that is able to adhere to the PET or PP film without conducting a separate chemical primer process.