Easy-open packaging body

Abstract

The disclosure relates to a packaging body including a container including a flange portion including a surface seal layer formed on a top surface, and a lid member that is joinable to the flange portion. In the flange portion, a side wall portion extending in a container axial direction is formed on an outer side of an outer peripheral edge of a joining position with the lid member. A resin accumulation composed of the surface seal layer and protruding outward from the outer peripheral edge of the joining position, and the surface seal layer having a small thickness serving as an opening start portion provided on the lower or inner side of the resin accumulation are provided. Thus, an easy-open packaging body that can be easily opened with a small opening force is achieved.

1 . An easy-open packaging body comprising:
 a container including a flange portion at a periphery of an opening, and a surface seal layer formed at least on a top surface of the flange portion, the surface seal layer being joinable to the lid member and easy to peel off from a base material of the container; and   a lid member configured to seal the container by joining to the surface seal layer of the flange portion, wherein   in the flange portion, a side wall portion extending in a container axial direction is formed on an outer side of an outer peripheral edge of a joining position with the lid member, and   the surface seal layer includes a resin accumulation protruding outward from the outer peripheral edge of the joining position, and a surface seal layer having a small thickness serving as an opening start portion on a lower or inner side of the resin accumulation.   
     
     
         2 . The easy-open packaging body according to  claim 1 , wherein the side wall portion is a perpendicular surface extending in the container axial direction or an inclined surface with an outer diameter increasing toward a lower side in the container axial direction. 
     
     
         3 . The easy-open packaging body according to  claim 1 , wherein on the side wall portion, a surface seal layer decreasing in thickness toward a lower side in the container axial direction is formed. 
     
     
         4 . The easy-open packaging body according to  claim 1 , wherein the opening start portion is located near an interface between the surface seal layer and the base material of the container at the outer peripheral edge of the joining position. 
     
     
         5 . The easy-open packaging body according to  claim 1 , wherein in an open operation, cohesive failure of the surface seal layer having a small thickness occurs from the opening start portion, and then interlayer peeling of the base material of the container and the surface seal layer proceeds, whereby the easy-open packaging body is opened. 
     
     
         6 . The easy-open packaging body according to  claim 1 , wherein in the flange portion, an outer step portion located on the outer side of the outer peripheral edge of the joining position with the lid member and on a lower side of a position of the joining position in the container axial direction is formed, and the side wall portion is formed between the outer peripheral edge of the joining position and an inner peripheral edge of the outer step portion. 
     
     
         7 . The easy-open packaging body according to  claim 1 , wherein the side wall portion is formed as an annular skirt portion extending downward in the container axial direction from the outer peripheral edge of the flange portion. 
     
     
         8 . The easy-open packaging body according to  claim 7 , wherein an outer inclined surface with an outer diameter increasing toward a lower side in the container axial direction is formed at an upper portion of the annular skirt portion. 
     
     
         9 . The easy-open packaging body according to  claim 1 , wherein
 in the flange portion, an inner step portion is formed on an inner side of an inner peripheral edge of the joining position and on a lower side of a position of the joining position in the container axial direction, and   on the inner step portion, a surface seal layer having a thickness smaller than a thickness of the surface seal layer of the flange portion before joined to the lid member is formed, or no surface seal layer is formed.   
     
     
         10 . The easy-open packaging body according to  claim 1 , wherein between the resin accumulation and the lid member, a resin accumulation resulting from a seal layer of the lid member is formed. 
     
     
         11 . The easy-open packaging body according to  claim 1 , wherein
 a first joining portion and a second joining portion that are joinable to the lid member, and a coupling portion are provided in the joining position of the flange portion,   the first joining portion has a protruding shape protruding upward from the flange portion,   the coupling portion is coupled with the first joining portion and/or the second joining portion, and   a top surface of the first joining portion is located on an upper side relative to a top surface of the second joining portion in the container axial direction.   
     
     
         12 . The easy-open packaging body according to  claim 11 , wherein a height difference between the top surface of the first joining portion and the top surface of the second joining portion is 0.01 mm to 0.20 mm. 
     
     
         13 . The easy-open packaging body according to  claim 11 , wherein the top surface of the flange portion has a step shape including the first joining portion, the coupling portion and the second joining portion. 
     
     
         14 . The easy-open packaging body according to  claim 11 , wherein the coupling portion has a recess shape or an uneven shape. 
     
     
         15 . The easy-open packaging body according to  claim 14 , wherein a width of a protrusion of the uneven shape in a container radial direction is smaller than a width of the first joining portion in the container radial direction. 
     
     
         16 . The easy-open packaging body according to  claim 1 , wherein the container includes a layered body in which the surface seal layer is formed on the base material layer.