Packaging Containers, Method of Producing Innertape, and Innertape for Packaging Containers

A method of producing an innertape used for sealing a container having an opening section provided at a top thereof for a fluid food and also having an opening device provided above the opening section by sealing an under surface of the opening section along the outer circumference thereof from the under side, said method comprising the steps of:

• coextruding linear low density polyethylene having the density in the range from 0.911 to 0.920;
• low density polyethylene having the density in the range from 0.917 to 0.923;
• an adhesive agent including linear low density polyethylene graft-modified by a chemically bonding functional group with ethylene-vinyl alcohol copolymer;
• ethylene vinyl alcohol copolymer with the ethylene content in the range from 35 to 49 moles;
• an adhesive agent including linear low density polyethylene graft-modified by a chemically bonding functional group with ethylene-vinyl alcohol copolymer;
• low density polyethylene having the density in the range from 0.917 to 0.923;
• and linear low density polyethylene having the density in the range from 0.911 to 0.920, in the order described above, and
• obtaining an innertape which is a laminate including a linear low density polyethylene outer layer with the layer thickness in the range from 1 to 9 microns;
• a low density polyethylene intermediate layer with the layer thickness in the range from 5 to 17 microns;
• an adhesive layer with the layer thickness in the range from 1 to 8 microns;
• an ethylene vinyl alcohol copolymer barrier layer with the layer thickness in the range from 2 to 9 microns;
• an adhesive layer with the layer thickness in the range from 1 to 8 microns;
• a low density polyethylene intermediate layer with the layer thickness in the range from 5 to 17 microns;
• and a linear low density polyethylene outer layer with the layer thickness in the range from 1 to 9 micron which are laminated in the order described above.

An innertape used for sealing a container having an opening section provided at a top thereof for a fluid food and also having an opening device provided above the opening section by sealing an under surface of the opening section along the outer circumference thereof from the under side, which is a laminate including a linear low density polyethylene outer layer with the layer thickness in the range from 3 to 7 microns;

• a low density polyethylene intermediate layer with the layer thickness in the range from 7 to 15 microns;
• an adhesive agent layer with the layer thickness in the range from 3 to 6 microns;
• an ethylene vinyl alcohol copolymer barrier layer with the ethylene content in the range from 40 to 44 moles and also with the layer thickness in the range from 4 to 7 microns;
• an adhesive agent layer with the layer thickness in the range from 1 to 8 microns;
• a low density polyethylene intermediate layer with the layer thickness in the range from 5 to 17 microns;
• and a linear low density polyethylene outer layer with the layer thickness in the range from 1 to 9 microns which are laminated in the order as described above.