Packaging container, filling method of contents for packaging container, and manufacturing method for packaging container

Abstract

A packaging container includes a first portion and a second portion that are placed on each other. Each of the first portion and the second portion has a projection polygonal surface having a projection polygonal shape, side portion polygonal surfaces extending from respective sides of the projection polygonal surface, a plurality of to-be-folded surfaces provided between the respective adjacent side portion polygonal surfaces, and a peripheral portion extending over an entirety of an outer edge. The first portion and the second portion are connected to each other at the peripheral portions by a side seal portion obtained by sealing the peripheral portions to each other, or by a connection portion obtained by folding the sheet material, and have air-tightness except for an opening.

1 . A packaging container formed from a sheet material and transformable between a box state and a flat state, the packaging container comprising:
 a first portion and a second portion that are placed on each other in the flat state, wherein   an opening is formed in the first portion,   each of the first portion and the second portion has a projection polygonal surface having a projection polygonal shape, side portion polygonal surfaces extending from respective sides of the projection polygonal surface, a plurality of to-be-folded surfaces provided between the respective adjacent side portion polygonal surfaces, and a peripheral portion extending over an entirety of an outer edge,   the first portion and the second portion are connected to each other at the peripheral portions by a side seal portion obtained by sealing the peripheral portions to each other, or by a connection portion obtained by folding the sheet material, and have air-tightness except for the opening,   in the flat state,   by bending the sheet material at the peripheral portions or further unfolding the sheet material at the connection portion, a cavity is formed between the first portion and the second portion, and an upper surface that is the projection polygonal surface of the first portion including the opening, a lower surface that is the projection polygonal surface of the second portion and that opposes the upper surface, a plurality of side surfaces formed by the side portion polygonal surfaces, and folded pieces obtained by folding the to-be-folded surfaces and the peripheral portions are formed, and   the respective folded pieces are overlaid on and along the side surfaces, whereby the packaging container can be transformed into the box state, and   in the box state,   the folded pieces are separated from the side surfaces,   the cavity between the first portion and the second portion is eliminated by unfolding the sheet material at the peripheral portions or further folding the sheet material at the unfolded connection portion, and   the first portion and the second portion are overlaid on each other, whereby the packaging container can be transformed into the flat state.   
     
     
         2 . The packaging container according to  claim 1 , wherein
 each of the first portion and the second portion has a rectangular shape,   each of the projection polygonal surface, the side portion polygonal surfaces, and the to-be-folded surfaces has a rectangular shape, and   the side seal portion is formed at at least two opposing edges.   
     
     
         3 . The packaging container according to  claim 1 , wherein
 each of the side portion polygonal surfaces is an isosceles trapezoidal surface having an isosceles trapezoidal shape,   each of the plurality of to-be-folded surfaces and the peripheral portions includes a folding ruled line that extends from a vertex of the projection polygonal surface toward the peripheral portion so as to bisect an angle formed by a first lateral side and a second lateral side shared by the to-be-folded surface and the isosceles trapezoidal surface adjacent to the to-be-folded surface,   each of lengths of the folding ruled lines is shorter in the flat state than a line that is obtained by axis-symmetrically reversing the folding ruled line about, as an axis side, a lateral side adjacent thereto in a predetermined direction of the first lateral side and the second lateral side and that is extended until intersecting a straight line including an opposite side, opposite to the axis side, of the isosceles trapezoidal surface adjacent thereto in the predetermined direction, and   when the packaging container is transformed into the box state, an end of the folded piece does not protrude from the opposite side.   
     
     
         4 . The packaging container according to  claim 1 , wherein at least a part of a portion of the first portion or the second portion that is the side surface in the box state, and a portion to be overlaid thereon have joining members that are attachable to/detachable from each other. 
     
     
         5 . The packaging container according to  claim 1 , wherein an end surface of the sheet material is not present within a height of 3 mm from the lower surface in the box state. 
     
     
         6 . The packaging container according to  claim 5 , wherein the opening is closed by a pump dispenser. 
     
     
         7 . The packaging container according to  claim 5 , wherein the sheet material includes a barrier layer that prevents permeation of water vapor and oxygen. 
     
     
         8 . The packaging container according to  claim 5 , wherein the end surface of the sheet material has a portion inclined relative to the lower surface. 
     
     
         9 . The packaging container according to  claim 8 , wherein an entirety of the end surface of the sheet material is inclined relative to the lower surface. 
     
     
         10 . The packaging container according to  claim 1 , wherein
 two or more alignment marks are provided at each of the edge of the first portion and the edge of the second portion, and the alignment marks of the first portion and the alignment marks of the second portion are located at positions corresponding to each other, and   each of the alignment marks of the first portion and the alignment marks of the second portion is formed by a recess that is recessed from the edge of the first portion or the second portion, or by a projection that projects from the edge of the first portion or the second portion, and has a depth or a height of 0.5 mm or greater.   
     
     
         11 . The packaging container according to  claim 10 , wherein the depth of the recess or the height of the projection is not less than 1.0 mm. 
     
     
         12 . The packaging container according to  claim 1 , wherein one of an outer shape of the first portion and an outer shape of the second portion is larger than the other thereof. 
     
     
         13 . The packaging container according to  claim 12 , wherein a difference between the outer shape of the first portion and the outer shape of the second portion is not less than 0.6 mm. 
     
     
         14 . The packaging container according to  claim 1 , wherein a peeling strength of the side seal portion is not less than 9 N. 
     
     
         15 . (canceled) 
     
     
         16 . A filling method of contents for the packaging container according to  claim 1 , the method comprising:
 when the packaging container is in the flat state,   a step of pulling the first portion and the second portion apart from each other to form a cavity between the first portion and the second portion;   a step of overlaying the side seal portion on and along the side surface;   a step of filling the contents into the cavity through the opening; and   a step of closing the opening.   
     
     
         17 . The filling method of the contents for the packaging container according to  claim 16 , wherein
 a spout is attached to the opening of the packaging container, and   in the step of closing the opening, the opening is closed by a cap attachable to the spout or a pump dispenser.   
     
     
         18 . A manufacturing method for a packaging container including the packaging container according to  claim 1  and a spout attached to the opening of the packaging container, the method comprising:
 a spout-equipped first portion production step of producing a first portion equipped with the spout in which the spout is mounted on the opening of the first portion; and 
 a fixing step of fixing the edge of the first portion equipped with the spout and the edge of the second portion of the packaging container to each other. 
 
     
     
         19 . The manufacturing method according to  claim 18 , wherein, in the spout-equipped first portion production step, after the first portion is formed using a sheet material, the spout is mounted to the formed first portion to form the first portion equipped with the spout. 
     
     
         20 . The manufacturing method according to  claim 18 , wherein, in the spout-equipped first portion production step, after the spout is mounted to a sheet material provided with the opening, the sheet material is stamped to form the first portion equipped with the spout. 
     
     
         21 . The manufacturing method according to  claim 18 , wherein
 the spout has a tubular trunk portion and a flange portion that projects outward from an end portion of the tubular trunk portion, and   in the spout-equipped first portion production step, the flange portion of the spout is welded to an inner surface side of the packaging container.