US20200062440A1 - Packaging container, filling method of contents for packaging container, and manufacturing method for packaging container - Google Patents

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

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Publication number
US20200062440A1
US20200062440A1 US16/413,096 US201916413096A US2020062440A1 US 20200062440 A1 US20200062440 A1 US 20200062440A1 US 201916413096 A US201916413096 A US 201916413096A US 2020062440 A1 US2020062440 A1 US 2020062440A1
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US
United States
Prior art keywords
packaging container
sheet
side sheet
spout
folded
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US16/413,096
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English (en)
Inventor
Noriyuki Sasaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toppan Inc
Original Assignee
Toppan Printing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2018096290A external-priority patent/JP7139685B2/ja
Priority claimed from JP2018119838A external-priority patent/JP7139714B2/ja
Priority claimed from JP2018119836A external-priority patent/JP7139713B2/ja
Priority claimed from JP2018153129A external-priority patent/JP7135572B2/ja
Application filed by Toppan Printing Co Ltd filed Critical Toppan Printing Co Ltd
Assigned to TOPPAN PRINTING CO., LTD. reassignment TOPPAN PRINTING CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SASAKI, NORIYUKI
Publication of US20200062440A1 publication Critical patent/US20200062440A1/en
Priority to US18/073,499 priority Critical patent/US20230107089A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
    • B65D5/20—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper by folding-up portions connected to a central panel from all sides to form a container body, e.g. of tray-like form
    • B65D5/24—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper by folding-up portions connected to a central panel from all sides to form a container body, e.g. of tray-like form with adjacent sides interconnected by gusset folds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
    • B65D5/32—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper having bodies formed by folding and interconnecting two or more blanks each blank forming a body part, whereby each body part comprises at least one outside face of the box, carton or tray
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
    • B65D5/36—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper specially constructed to allow collapsing and re-erecting without disengagement of side or bottom connections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
    • B65D5/42—Details of containers or of foldable or erectable container blanks
    • B65D5/72—Contents-dispensing means
    • B65D5/74—Spouts
    • B65D5/746—Spouts formed separately from the container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2105/00—Rigid or semi-rigid containers made by assembling separate sheets, blanks or webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
    • B65D5/42—Details of containers or of foldable or erectable container blanks
    • B65D5/44—Integral, inserted or attached portions forming internal or external fittings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
    • B65D5/42—Details of containers or of foldable or erectable container blanks
    • B65D5/72—Contents-dispensing means
    • B65D5/74—Spouts

Definitions

  • the present invention relates to a packaging container, a filling method of contents for a packaging container, and a manufacturing method for a packaging container.
  • a packaging container formed by bending a sheet material into a box shape and overlaying and sealing end portions of the sheet material has been known.
  • Patent Literature 1 Japanese Laid-Open Patent Publication No. H9-290822 discloses a packaging container (liquid packaging paper container) in which a peelable pull tab is provided at a side seal portion of a container body that is formed by using a sheet material having paper as a base material, and the pull tab is peelably provided via a peeling layer composed of an easy-to-peel tape-like film.
  • the packaging container can be broken down by, as a trigger, pulling the pull tab to peel the side seal portion or pulling a pull tab, which is provided to a side plate, to tear the side plate.
  • Patent Literature 1 The packaging container of Patent Literature 1 is easily broken down upon disposal, and thus is useful for reduction in volume of garbage. However, the packaging container that has been broken down cannot be assembled and used again.
  • the present invention has been made in view of such a problem, and an object of the present invention is to provide a packaging container that can be transformed between a box state and a flat state and that can be reused by returning the packaging container to the box state even after being once flattened into the flat state.
  • An aspect of the present invention for solving the above problem is 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
  • a packaging container that can be transformed between a box state and a flat state and that can be reused by returning the packaging container to the box state even after being once flattened into the flat state.
  • FIG. 1 is a perspective view of a packaging container in a box state according to a first embodiment of the present invention
  • FIG. 2 shows perspective views of the packaging container in a flat state according to the first embodiment of the present invention
  • FIG. 3 is a plan view of a blank for the packaging container according to the first embodiment of the present invention.
  • FIG. 4 illustrates a state of transformation of the packaging container according to the first embodiment of the present invention
  • FIG. 5 shows cross-sectional views of ruled lines of the packaging container according to the first embodiment of the present invention
  • FIG. 6 illustrates a state of transformation according to a modification of the packaging container
  • FIG. 7 shows plan views of packaging containers according to modifications of the present invention.
  • FIG. 8 illustrates a method for filling contents into the packaging container according to the embodiment of the present invention
  • FIG. 9 shows a perspective view and a side view showing a box state of a packaging container according to a second embodiment of the present invention.
  • FIG. 10 shows perspective views showing a flat state of the packaging container according to the second embodiment of the present invention.
  • FIG. 11 shows plan views of a blank for the packaging container according to the second embodiment of the present invention.
  • FIG. 12 is a perspective view showing a box state of a packaging container according to a comparative embodiment
  • FIG. 13 is a plan view for explaining the length of a folding ruled line
  • FIG. 14 illustrates a transformation procedure for the packaging container according to the second embodiment of the present invention
  • FIG. 15 is a plan view showing a modification of the blank
  • FIG. 16 is an explanatory perspective view showing a packaging container according to a third embodiment of the present invention.
  • FIG. 17 is an explanatory perspective view showing another embodiment of the packaging container according to the third embodiment of the present invention.
  • FIG. 18 is a schematic plan view showing a blank for the packaging container shown in FIG. 16 ;
  • FIG. 19 is a schematic plan view showing a blank for the packaging container shown in FIG. 17 ;
  • FIG. 20 is a schematic cross-sectional view showing an example of the layer configuration of a laminate used in the packaging container according to the third embodiment of the present invention.
  • FIG. 21 is an explanatory perspective view showing still another embodiment of the packaging container according to the third embodiment of the present invention.
  • FIG. 22 is an explanatory perspective view showing still another embodiment of the packaging container according to the third embodiment of the present invention.
  • FIG. 23 is an explanatory perspective view showing a packaging container according to a fourth embodiment of the present invention.
  • FIG. 24 is an explanatory perspective view showing another embodiment of the packaging container according to the fourth embodiment of the present invention.
  • FIG. 25 is a schematic plan view showing a blank for the packaging container shown in FIG. 23 ;
  • FIG. 26 is a schematic plan view showing a blank for the packaging container shown in FIG. 24 ;
  • FIG. 27 is a schematic cross-sectional view showing an example of the layer configuration of a laminate used in the packaging container according to the fourth embodiment of the present invention.
  • FIG. 28 is an explanatory perspective view showing another embodiment of the packaging container according to the fourth embodiment of the present invention.
  • FIG. 29 is a plan view of a top-side sheet of a packaging container according to a fifth embodiment of the present invention
  • FIG. 30 is a plan view of a bottom-side sheet of the packaging container according to the fifth embodiment of the present invention.
  • FIG. 31 is a plan view of the packaging container in a flat state according to the fifth embodiment of the present invention.
  • FIG. 32 is a perspective view of the packaging container in a box state according to the fifth embodiment of the present invention.
  • FIG. 33 is a plan view according to a first modification of the packaging container according to the fifth embodiment of the present invention in the case where both the top-side sheet and the bottom-side sheet are formed by one sheet;
  • FIG. 34 is a plan view of a top-side sheet of a second modification of the packaging container according to the fifth embodiment of the present invention.
  • FIG. 35 is a plan view of a bottom-side sheet of the second modification of the packaging container according to the fifth embodiment of the present invention.
  • FIG. 36 is a perspective view of the second modification of the packaging container in a box state according to the fifth embodiment of the present invention.
  • FIG. 37 is a plan view of a top-side sheet of a third modification of the packaging container according to the fifth embodiment of the present invention.
  • FIG. 38 is a plan view of a bottom-side sheet of the third modification of the packaging container according to the fifth embodiment of the present invention.
  • FIG. 39 is a perspective view of the third modification of the packaging container in a box state according to the fifth embodiment of the present invention.
  • FIG. 40 is a plan view of a top-side sheet of a packaging container according to a sixth embodiment of the present invention.
  • FIG. 41 is a plan view of a bottom-side sheet of the packaging container according to the sixth embodiment of the present invention.
  • FIG. 42 is a plan view of the packaging container in a flat state according to the sixth embodiment of the present invention.
  • FIG. 43 is a perspective view of the packaging container in a box state according to the sixth embodiment of the present invention.
  • FIG. 44 is a plan view according to a first modification of the packaging container according to the sixth embodiment of the present invention in the case where both the top-side sheet and the bottom-side sheet are formed by one sheet;
  • FIG. 45 is a plan view of a top-side sheet of a second modification of the packaging container according to the sixth embodiment of the present invention.
  • FIG. 46 is a plan view of a bottom-side sheet of the second modification of the packaging container according to the sixth embodiment of the present invention.
  • FIG. 47 is a perspective view of the second modification of the packaging container in a box state according to the sixth embodiment of the present invention.
  • FIG. 48 is a plan view of a top-side sheet of a third modification of the packaging container according to the sixth embodiment of the present invention.
  • FIG. 49 is a plan view of a bottom-side sheet of the third modification of the packaging container according to the sixth embodiment of the present invention.
  • FIG. 50 is a perspective view of the third modification of the packaging container in a box state according to the sixth embodiment of the present invention.
  • FIG. 51 is a perspective view of a spout that can be used in a production method of the present invention.
  • FIG. 52 is an explanatory perspective view for a spout-equipped first portion production step of the production method of the present invention.
  • FIG. 53 is an explanatory perspective view for a fixing step of the production method of the present invention.
  • Packaging containers, filling methods of contents for the packaging containers, and manufacturing methods for the packaging containers, according to embodiments of the present invention, will be described with reference to the drawings.
  • the up-down direction in a state where a packaging container is erected in a box state is referred to as an up-down direction.
  • a packaging container 1100 is a container that is formed by overlaying and sealing end portions of a blank obtained by cutting a sheet material into a predetermined shape and that is transformable between a box state and a flat state.
  • Part (a) of FIG. 1 shows a perspective view of the packaging container 1100 that is erected in the box state.
  • part (b) of FIG. 1 shows a perspective view of the packaging container 1100 before later-described side seal portions 1140 are bent along a side surface 1120 composed of a pair of opposing first side surfaces 1121 and a pair of opposing second side surfaces 1122 .
  • the packaging container 1100 that is in the box state forms a cavity (storage space) by an upper surface 1110 having an opening 1111 formed therein, a lower surface 1130 , the pair of opposing first side surfaces 1121 , and the pair of opposing second side surfaces 1122 .
  • the packaging container 1100 may be provided with a spout 1112 attached to the opening 1111 .
  • each first side surface 1121 is formed by two surfaces, that is, an upper first side surface 1121 a connected to the upper surface 1110 , and a lower first side surface 1121 b connected to the lower surface 1130 .
  • the heights of the upper first side surface 1121 a and the lower first side surface 1121 b , which form the first side surfaces 1121 are not particularly limited, but are each suitably not less than 10 mm and not greater than 800 mm.
  • the heights of the second side surfaces 1122 are not particularly limited, but are each suitably not less than 20 mm and not greater than 800 mm.
  • Bend pieces 1150 are connected to both side ends of the first side surfaces 1121 and the second side surfaces 1122 , respectively, in a state of being bent in a triangular shape such that the bend pieces 1150 can be bent at the boundaries between the bend pieces 1150 and the first side surfaces 1121 and the second side surfaces 1122 .
  • the surfaces at the first side surface 1121 side of the bend pieces 1150 are formed so as to be divided into surfaces connected to both side ends of the upper first side surfaces 1121 a and surfaces connected to both side ends of the lower first side surfaces 1121 b.
  • the side seal portions 1140 having a predetermined width and formed by sealing the end portions of the sheet material are connected to the centers in the up-down direction of the first side surfaces 1121 and the bend pieces 1150 , which are connected to both side ends of the first side surfaces 1121 , such that the side seal portions 1140 can be bent at the boundaries between the side seal portions 1140 and the first side surfaces 1121 and the bend pieces 1150 .
  • the side seal portions 1140 are formed by sealing, to each other, first seal margins 1191 that have a predetermined width and that extend from the lower ends of the upper first side surfaces 1121 a and the bend pieces 1150 connected to both side ends of the upper first side surfaces 1121 a and from the upper ends of the lower first side surfaces 1121 b and the bend pieces 1150 connected to both side ends of the lower first side surface 1121 b , respectively.
  • a linear first ruled line 1171 is formed on the sheet material between each side seal portion 1140 and each first side surface 1121 and the bend pieces 1150 at both side ends of the first side surface 1121 .
  • a linear second ruled line 1172 is formed on the sheet material at the centers in the up-down direction of each second side surface 1122 and the bend pieces 1150 at both side ends of the second side surface 1122 . If it is possible to bend the sheet material at appropriate portions, the first ruled line 1171 and the second ruled line 1172 do not have to be provided.
  • the side seal portions 1140 are bent along the first side surfaces 1121 and the second side surfaces 1122 by bending the side seal portions 1140 along the first ruled lines 1171 toward the first side surfaces 1121 and then bending the bend pieces 1150 along the second side surfaces 1122 .
  • FIG. 2 shows perspective views of the packaging container 1100 that is in the flat state.
  • Part (a) of FIG. 2 is a perspective view showing a state where the upper surface 1110 of the packaging container 1100 that is in the flat state is located at the upper side.
  • Part (b) of FIG. 2 is a perspective view showing a state where the lower surface 1130 of the packaging container 1100 that is in the flat state is located at the upper side.
  • the packaging container 1100 that in the flat state is composed of a rectangular first portion 1201 and a rectangular second portion 1202 that are placed on each other.
  • the first portion 1201 includes the upper surface 1110 (projection polygonal surface), a pair of the upper first side surfaces 1121 a (side portion polygonal surfaces), portions (side portion polygonal surfaces) of the pair of second side surfaces 1122 above the second ruled line 1172 , portions of the bend pieces 1150 above the first ruled lines 1171 and the second ruled lines 1172 , and the upper surfaces of the first seal margins 1191 , which form the side seal portions 1140 . These portions each have a rectangular shape as shown in FIG. 2 .
  • the second portion 1202 includes the lower surface 1130 (projection polygonal surface), a pair of the lower first side surfaces 1121 b (side portion polygonal surfaces), portions (side portion polygonal surfaces) of the pair of second side surfaces 1122 below the second ruled lines 1172 , portions of the bend pieces 1150 below the first ruled lines 1171 and the second ruled lines 1172 , and the lower surfaces of the first seal margins 1191 , which form the side seal portions 1140 .
  • These portions each have a rectangular shape as shown in FIG. 2 .
  • the side seal portions 1140 each obtained by sealing sheet materials to each other are located at opposing edges of the four edges.
  • the first ruled lines 1171 are located on the inner sheet materials of the side seal portions 1140 .
  • folded portions 1180 are formed along the linear second ruled lines 1172 at the other two edges of each of the first portion 1201 and the second portion 1202 by folding the sheet material.
  • the packaging container 1100 formed as described above has air-tightness except for the opening 1111 .
  • FIG. 3 shows a plan view (development view) of a blank 1101 that is an example of a blank for the packaging container 1100 .
  • the blank 1101 is formed by cutting one sheet material into a predetermined shape and partitioning regions for forming each surface and the like in the box state, with ruled lines shown by dotted lines.
  • the sheet material used for the blank 1101 is not particularly limited, but, for example, a laminated film having a thermoplastic resin layer or a sealant layer layered on a base material layer made of paper can be suitably used. In addition to this, a barrier layer, a functional film, or the like may be added as appropriate according to a required function.
  • the pair of second side surfaces 1122 are connected to opposing two edges of the lower surface 1130 , and a pair of the lower first side surfaces 1121 b are connected to the other two edges of the lower surface 1130 .
  • the four bend pieces 1150 are connected between the adjacent second side surfaces 1122 and lower first side surface 1121 b.
  • the upper surface 1110 is connected to the edge, of one of the second side surfaces 1122 , which opposes the lower surface 1130 .
  • a pair of the upper first side surfaces 1121 a are connected to the edges, of the upper surface 1110 , which are orthogonal to the edge, of the upper surface 1110 , to which the second side surface 1122 is connected.
  • a second seal margin 1192 for a top seal portion for sealing and connecting the other second side surface 1122 and the bend pieces 1150 connected to the other second side surface 1122 to the upper surface 1110 and the upper first side surfaces 1121 a connected to the upper surface 1110 , is connected over a predetermined width to the edges, of the other second side surface 1122 and the bend pieces 1150 connected to the other second side surface 1122 , which oppose the lower surface 1130 and the lower first side surfaces 1121 b.
  • a pair of the first seal margins 1191 for forming the side seal portions 1140 are connected over a predetermined width to the edges, of the bend pieces 1150 , the upper first side surfaces 1121 a , and the lower first side surfaces 1121 b , which oppose the upper surface 1110 , the lower surface 1130 , and the second side surfaces 1122 , and the edges, of the second seal margin 1192 for a top seal portion, which are orthogonal to the edge, of the second seal margin 1192 , to which the bend pieces 1150 are connected.
  • the first seal margins 1191 and the second seal margin 1192 are shown by hatching.
  • the end portion of the second seal margin 1192 may be subjected to edge protection treatment by skiving and hemming, edge protection tape, or the like.
  • the above-described linear first ruled lines 1171 are formed between the first seal margins 1191 and the bend pieces 1150 , the upper first side surfaces 1121 a , the lower first side surfaces 1121 b , and the second seal margin 1192 .
  • the above-described linear second ruled lines 1172 passing through the centers of the second side surfaces 1122 and the bend pieces 1150 are each formed on the second side surface 1122 , a pair of the bend pieces 1150 connected to the second side surface 1122 , and the first seal margins 1191 .
  • ruled lines are formed so as to extend diagonally from the points of contact between the edges at the first seal margin 1191 side of the bend pieces 1150 and the second ruled lines 1172 to corners of the upper surface 1110 and the lower surface 1130 .
  • Parts (a) to (d) of FIG. 4 illustrate respective procedural steps according to the method for transforming the container body 1100 .
  • the sheet material of the packaging container 1100 that is in the flat state is bent along the first ruled lines 1171 , or the folded portions 1180 of the sheet material are unfolded along the second ruled lines 1172 , thereby pulling the first portion 1201 and the second portion 1202 apart from each other to form a cavity between the first portion 1201 and the second portion 1202 and forming the upper surface 1110 , the lower surface 1130 , the first side surfaces 1121 , and the second side surfaces 1122 .
  • bending of the sheet material along the first ruled lines 1171 and unfolding of the folded portions 1180 along the second ruled lines 1172 may be simultaneously performed.
  • FIG. 5 shows cross-sectional views of areas around the first ruled lines 1171 and the second ruled line 1172 at this time.
  • Part (a) of FIG. 5 shows a cross-section of the area around the first ruled lines 1171 , taken along a line A-A′.
  • Part (b) of FIG. 5 shows a cross-section of the area around the second ruled line 1172 , taken along a line B-B′.
  • the sheet material is bent along the first ruled lines 1171 by transforming the packaging container 1100 from the flat state into the box state.
  • each folded portion 1180 of the sheet material is unfolded along the second ruled line 1172 by transforming the packaging container 1100 from the flat state into the box state.
  • the first ruled lines 1171 and the second ruled lines 1172 each have a shape recessed from the front surface toward the back surface of the sheet material.
  • the shapes of the first ruled lines 1171 and the second ruled lines 1172 are not limited thereto, and may be, for example, a linear shape projecting toward the back surface.
  • the side seal portions 1140 are bent upward or downward along the first ruled lines 1171 .
  • the bend pieces 1150 are bent toward the second side surfaces 1122 . Accordingly, the side seal portions 1140 can be overlaid on and along the first side surfaces 1121 and the second side surfaces 1122 .
  • the bend pieces 1150 may be adhered to the second side surfaces 1122 .
  • the method for adhering the bend pieces 1150 to the second side surfaces 1122 include methods using heat-sealing, a hot-melt adhesive, and the like.
  • attachable/detachable joining members such as hook and loop fasteners and snap buttons, the packaging container 1100 that has been transformed from the box state into the flat state is allowed to be used again in the box state, so that it is possible to reuse the packaging container 1100 that is in the flat state.
  • the packaging container 1100 that is in the flat state can be transformed into the box state as shown in part (d) of FIG. 4 .
  • the packaging container 1100 in the box state can be transformed into the flat state through a procedure opposite to the above procedure.
  • the bend pieces 1150 of the packaging container 1100 in the box state are separated from the second side surfaces 1122 .
  • the sheet material is unfolded along the first ruled lines 1171 , or the sheet material is folded back along the second ruled lines 1172 (that is, brought from the state in the right drawing to the state of the left drawing in FIG. 5 ).
  • unfolding of the sheet material along the first ruled lines 1171 and folding-back of the sheet material along the second ruled lines 1172 may be simultaneously performed.
  • the cavity between the first portion 1201 and the second portion 1202 is eliminated, and the first portion 1201 and the second portion 1202 are overlaid on each other, whereby the packaging container 1100 can be transformed into the flat state.
  • FIG. 6 shows a transformation method according to a modification.
  • the difference between the transformation method in FIG. 6 and the transformation method in FIG. 4 is the directions in which the side seal portions 1140 are bent and the directions in which the bend pieces 1150 are folded.
  • the side seal portions 1140 are bent upward along the first ruled lines 1171 as shown by black arrows. Then, as shown in part (c) of FIG. 6 , the bend pieces 1150 are folded toward the first side surfaces 1121 .
  • the packaging container 1100 that is in the flat state can be transformed into a state where the side seal portions 1140 are overlaid on and along the first side surfaces 1121 and the second side surfaces 1122 at the upper side of the side surface 1120 as shown in part (d) of FIG. 6 .
  • the packaging container 1100 transformed as described above can also be transformed into the flat state through a procedure opposite to the above procedure.
  • the side seal portions 1140 are provided at the opposing two edges of the rectangular first portion 1201 and the rectangular second portion 1202 , but the number of side seal portions 1140 is not limited to two.
  • FIG. 7 shows plan views in flat states of a packaging container 1300 and a packaging container 1400 according to modifications.
  • the differences between the packaging container 1100 and the packaging container 1300 and the packaging container 1400 are the positions at which the side seal portions 1140 , the first ruled lines 1171 , and the second ruled lines 1172 are formed.
  • a side seal portion 1141 shown by hatching is formed over three edges.
  • Linear first ruled lines 1171 are formed at the inner side of the side seal portion 1141
  • a second ruled line 1172 is formed at the remaining one edge.
  • a pair of first seal margins and a pair of second seal margins are provided at opposing edges of one substantially rectangular blank, and the packaging container 1300 can be formed by bending the blank at the center and then sealing the respective seal margins.
  • a side seal portion 1142 is formed over all of four edges.
  • Linear first ruled lines 1171 are formed at the inner side of the side seal portion 1142 .
  • no second ruled line 1172 is formed.
  • a first portion and a second portion are each formed by a square blank, and the packaging container 1400 can be formed by sealing the entire edges of the first portion and the second portion.
  • a packaging container that can be transformed between a box state and a flat state and that can be reused by returning the packaging container to the box state even after being once flattened into the flat state.
  • FIG. 8 sequentially illustrates each step of the filling method from the upper side toward the lower side of the sheet surface thereof.
  • the filling method includes: a step of forming a cavity between the first portion 1201 and the second portion 1202 ; a step of bending the side seal portions 1140 such that the side seal portions 1140 extend along the side surface 1120 ; a step of adhering the bend pieces 1150 to the second side surfaces 1122 ; a step of filling contents into the cavity of the packaging container 1100 through the opening 1111 ; and a step of closing the opening 1111 .
  • each step will be described.
  • the first portion 1201 and the second portion 1202 of the packaging container 1100 that is in the flat state are pulled apart from each other to form a cavity between the first portion 1201 and the second portion 1202 .
  • the sheet material of the packaging container 1100 is bent along the first ruled lines 1171 , or the folded portions 1180 of the sheet material are unfolded along the second ruled lines 1172 .
  • bending of the sheet material along the first ruled lines 1171 and unfolding of the folded portions 1180 along the second ruled lines 1172 may be simultaneously performed.
  • the side seal portions 1140 are bent so as to extend along the side surface 1120 . Specifically, the side seal portions 1140 are bent upward or downward along the first ruled lines 1171 , and the bend pieces 1150 are bent toward the second side surfaces 1122 .
  • the side seal portions 1140 may be bent by the transformation method according to the modification shown in parts (b) and (c) of FIG. 6 . Specifically, the side seal portions 1140 may be bent upward along the first ruled lines 1171 , and then the bend pieces 1150 may be bent toward the first side surfaces 1121 .
  • the bend pieces 1150 are adhered to the second side surfaces 1122 .
  • the adhering method for example, a known method such as heat-sealing, a hot-melt adhesive, a hook and loop fastener, and a snap button can be used. Accordingly, the packaging container 1100 is brought into the box state.
  • the contents are filled into the cavity of the packaging container 1100 through the opening 1111 .
  • a filling means such as a filling nozzle is inserted into the spout 1112 , and then the contents are filled into the cavity of the packaging container 1100 by the filling means.
  • the opening 1111 is closed.
  • the spout 1112 is hermetically sealed by screwing a cap 1300 to the spout 1112 .
  • the packaging container 1100 filled with the contents can be obtained.
  • the method for closing the opening 1111 is not limited to the method with the cap 1300 , and, for example, a pump dispenser or the like may be mounted on the spout 1112 , or the opening 1111 may be closed by a film or the like.
  • the filling method includes the step of forming a cavity between the first portion 1201 and the second portion 1202 , the step of bending the side seal portions 1140 such that the side seal portions 1140 extend along the side surface 1120 , the step of adhering the bend pieces 1150 to the second side surfaces 1122 , the step of filling the contents into the cavity of the packaging container 1100 through the opening 1111 , and the step of closing the opening 1111 , the order of these steps may be partially changed.
  • a step of filling the contents into the cavity of the packaging container 1100 while forming a cavity between the first portion 1201 and the second portion 1202 , or forming a cavity between the first portion 1201 and the second portion 1202 while filling the contents into the cavity of the packaging container 1100 , and then bending the side seal portions 1140 such that the side seal portions 1140 extend along the side surface 1120 , the step of adhering the bend pieces 1150 to the second side surfaces 1122 , and the step of closing the opening 1111 may be performed in this order.
  • the packaging container in which the end portions are sealed and folded into a flat state in advance can be transformed into the box shape, the contents are filled into the packaging container, and then the packaging container is hermetically sealed by a cap or the like. Therefore, a sealing step for ensuring air-tightness in a contents filling line is eliminated, and it is unnecessary to guarantee sealability in the filling line. As a result, a decrease in production efficiency can be inhibited.
  • the packaging container can be kept in the flat state immediately before the filling line.
  • the loading efficiency of the packaging container is high, and the transportation and storage costs of the packaging container can be reduced.
  • the packaging container used in the filling method can be transformed into a rigid box state by bending parts of the sheet material or further unfolding the sheet material.
  • an apparatus for assembling the packaging container can have a simple structure and lower cost.
  • attachable/detachable joining members such as hook and loop fasteners and snap buttons are used for the method for adhering the bend pieces to the side surfaces
  • the adhered bend pieces can be separated from the side surfaces, and the packaging container can be transformed into the flat state.
  • a packaging container 2100 according to a second embodiment of the present invention is a container that is formed by overlaying and sealing end portions of a blank obtained by cutting a sheet material into a predetermined shape and that is transformable between a box state and a flat state.
  • FIG. 9 shows a perspective view (part (a) of FIG. 9 ) and a side view (part (b) of FIG. 9 ) of the packaging container 2100 that is in the box state
  • FIG. 10 shows perspective views of the packaging container 2100 that is in the flat state
  • FIG. 11 shows plan views of an example of a blank for the packaging container 2100
  • Part (a) of FIG. 10 is a perspective view showing a state where an upper surface 2110 of the packaging container 2100 that is in the flat state is located at the upper side
  • part (b) of FIG. 10 is a perspective view showing a state where a lower surface 2130 of the packaging container 2100 that is in the flat state is located at the upper side.
  • a side seal portion 2140 and folded pieces 2150 shown in part (a) of FIG. 9 are omitted.
  • the packaging container 2100 that is in the box state forms a cavity (storage space) by the upper surface 2110 , the lower surface 2130 , and a side surface 2120 .
  • the side seal portion 2140 and the folded pieces 2150 are provided along an outer peripheral of the side surface 2120 .
  • the side seal portion 2140 extends along the side surface 2120 in a state where the edge of the side seal portion 2140 faces the upper surface 2110 side is shown, but the side seal portion 2140 may extend along the side surface 2120 in a state where the edge of the side seal portion 2140 faces the lower surface 2130 side.
  • the packaging container 2100 that is in the flat state is composed of a first portion 2170 a and a second portion 2170 b that are placed on each other.
  • a blank for forming the packaging container 2100 is composed of a blank 2101 a corresponding to the first portion 2170 a and a blank 2101 b corresponding to the second portion 2170 b.
  • the first portion 2170 a includes: the upper surface 2110 (projection polygonal surface); a plurality of upper isosceles trapezoidal surfaces 2120 a extending from the respective sides of the upper surface 2110 ; a plurality of upper to-be-folded surfaces 2150 a formed between the adjacent respective upper isosceles trapezoidal surfaces 2120 a ; and an upper seal margin 2140 a that forms a peripheral portion over the entirety of the outer edge of the first portion 2170 a along the edges of the upper isosceles trapezoidal surfaces 2120 a and the upper to-be-folded surfaces 2150 a at the side opposite to the upper surface 2110 .
  • the second portion 2170 b includes: the lower surface 2130 (projection polygonal surface); a plurality of lower isosceles trapezoidal surfaces 2120 b extending from the respective sides of the lower surface 2130 ; a plurality of lower to-be-folded surfaces 2150 b formed between the adjacent respective lower isosceles trapezoidal surfaces 2120 b ; and a lower seal margin 2140 b that forms a peripheral portion over the entirety of the outer edge of the second portion 2170 b along the edges of the lower isosceles trapezoidal surfaces 2120 b and the lower to-be-folded surfaces 2150 b at the side opposite to the lower surface 2130 .
  • the upper surface 2110 and the lower surface 2130 are projection polygonal surfaces.
  • the upper surface 2110 and the lower surface 2130 are formed so as to be congruent to each other.
  • the upper surface 2110 and the lower surface 2130 may have similar shapes with different areas as an example.
  • the shapes of the upper surface 2110 and the lower surface 2130 are not limited as long as the shapes are projection polygonal shapes.
  • a tetragon is also useful in terms of loading efficiency in the box state, subdivision into components, etc.
  • An opening 2111 is formed in the upper surface 2110 .
  • the plurality of upper isosceles trapezoidal surfaces 2120 a and the plurality of lower isosceles trapezoidal surfaces 2120 b are surfaces for forming the side surface 2120 of the packaging container 2100 that is in the box state.
  • the upper isosceles trapezoidal surfaces 2120 a and the lower isosceles trapezoidal surfaces 2120 b are rectangular.
  • At least either the upper isosceles trapezoidal surfaces 2120 a or the lower isosceles trapezoidal surfaces 2120 b may have an isosceles trapezoidal shape that is not rectangular.
  • the upper isosceles trapezoidal surfaces 2120 a extend from the respective sides of the upper surface 2110 (projection polygonal surface) and each have two parallel sides, one of which is the corresponding side of the upper surface 2110 .
  • the lower isosceles trapezoidal surfaces 2120 b extend from the respective sides of the lower surface 2130 (projection polygonal surface) and each have two parallel sides, one of which is the corresponding side of the lower surface 2130 .
  • the sides at the upper seal margin 2140 a side of the upper isosceles trapezoidal surfaces 2120 a and the sides at the lower seal margin 2140 b side of the lower isosceles trapezoidal surfaces 2120 b are formed to have the same length.
  • the upper to-be-folded surfaces 2150 a and the lower to-be-folded surfaces 2150 b are surfaces for forming the folded pieces 2150 of the packaging container 2100 that is in the box state, and are surfaces to be folded in a later-described transformation process.
  • the upper to-be-folded surfaces 2150 a and the lower to-be-folded surfaces 2150 b include folding ruled lines 2151 that extend from the respective vertexes of the upper surface 2110 and the lower surface 2130 toward the peripheral portions of the first portion 2170 a and the second portion 2170 b , as shown by dotted lines in FIG. 11 .
  • each of the folding ruled lines 2151 formed on the upper to-be-folded surfaces 2150 a extends so as to bisect the angle formed by a first lateral side 2121 a and a second lateral side 2122 a shared by the upper to-be-folded surface 2150 a and the upper isosceles trapezoidal surfaces 2120 a adjacent to the upper to-be-folded surface 2150 a .
  • each of the folding ruled lines 2151 formed on the lower to-be-folded surfaces 2150 b extends so as to bisect the angle formed by a first lateral side 2121 b and a second lateral side 2122 b shared by the lower to-be-folded surface 2150 b and the lower isosceles trapezoidal surfaces 2120 b adjacent to the lower to-be-folded surface 2150 b.
  • the upper seal margin 2140 a and the lower seal margin 2140 b are band-like surfaces provided for connecting the first portion 2170 a and the second portion 2170 b at the peripheral portions thereof.
  • the first portion 2170 a and the second portion 2170 b are overlaid on each other, and surfaces thereof at which the upper seal margin 2140 a and the lower seal margin 2140 b oppose each other are sealed or bonded to each other, for example, whereby the side seal portion 2140 is formed.
  • the shapes of the upper seal margin 2140 a and the lower seal margin 2140 b only need to allow the seal margins to be placed on each other in order to overlay the seal margins on each other and form the side seal portion 2140 , and can be optionally set.
  • the width of the side seal portion 2140 may be uniform or may not be uniform, as long as the first portion 2170 a and the second portion 2170 b can be connected to each other, or the edges thereof may not be linear.
  • the widths of the upper seal margin 2140 a and the lower seal margin 2140 b may be set such that the upper seal margin 2140 a and the lower seal margin 2140 b spread outward at predetermined angles toward the folding ruled lines 2151 at the outer sides of the upper to-be-folded surfaces 2150 a and the lower to-be-folded surfaces 2150 b .
  • the peripheral portion can be formed on and along straight lines parallel to the respective sides of the upper surface 2110 and the lower surface 2130 , so that the design quality can be improved.
  • the regions to be sealed can be, for example, band-like regions having a predetermined width as shown by hatching in FIG. 11 .
  • the packaging container 2100 formed as described above has air-tightness except for the opening 2111 .
  • Each of the blanks 2101 a and 2101 b can be formed, for example, by cutting a sheet material into a predetermined shape and providing ruled lines as shown by thin lines and dotted lines in FIG. 11 to partition regions for forming each surface.
  • the sheet material used for the blanks 2101 a and 2101 b is not particularly limited, but, for example, a laminated film having a thermoplastic resin layer or a sealant layer layered on a base material layer made of paper can be suitably used.
  • a barrier layer, a functional film, or the like may be added as appropriate according to a required function.
  • FIG. 12 shows a perspective view of a packaging container 2500 according to a comparative embodiment in which ends of folded pieces 2150 protrude from sides from which the folded pieces 2150 adjacent thereto extend.
  • the appearance of the packaging container 2100 is deteriorated.
  • the thickness of the packaging container 2100 increases and thus the appearance of the packaging container 2100 is not good.
  • the sheet material is thick, it may also be difficult to overlay a plurality of the folded pieces 2150 on each other.
  • each of the folding ruled lines 2151 is set such that, when the packaging container 2100 is in the flat state, the folding ruled line 2151 is shorter than a line that is obtained by axis-symmetrically reversing the folding ruled line 2151 about, as an axis side, a lateral side adjacent thereto in a predetermined direction of the first lateral sides 2121 a or 2121 b and the second lateral sides 2122 a or 2122 b and that is extended until intersecting a straight line including the side, opposite to the axis side, of the upper isosceles trapezoidal surface 2120 a or the lower isosceles trapezoidal surface 2120 b adjacent thereto in the predetermined direction.
  • FIG. 13 shows a partially enlarged view of the blank 2101 a for the packaging container 2100 .
  • folding ruled line 2151 having a length L 1 shown by a thick line in FIG. 13 .
  • a line segment is assumed which is obtained by axis-symmetrically reversing the folding ruled line 2151 about, as an axis side, a lateral side (first lateral side 2121 a ) adjacent thereto in a predetermined direction (as an example, in FIG. 13 , the direction to the first lateral side 2121 a ), as shown by a white arrow.
  • a line segment 2151 ′ having a length L 2 is obtained by extending the line segment obtained by the reversion until the line segment intersects a straight line including the side (second lateral side 2122 a ), opposite to the axis side, of the upper isosceles trapezoidal surface 2120 a adjacent thereto in the above predetermined direction.
  • the dimensions of each portion of the packaging container 2100 are determined such that the relationship of the length L 2 of the line segment 2151 ′ obtained as a result of this and the length L 1 of the folding ruled line 2151 satisfies L 1 ⁇ L 2 .
  • the “predetermined direction” is set to be the direction to the first lateral side 2121 a (the left side in the surface of the sheet of FIG. 13 ) as seen from the folding ruled line 151 , but the direction to the second lateral side 2122 a (the right side in the surface of the sheet of FIG. 13 ), which is opposite to the above direction, may be set as the “predetermined direction”.
  • the lengths of the respective sides of the upper surface 2110 and the lower surface 2130 are set to be longer, and the heights of the upper isosceles trapezoidal surfaces 2120 a and the lower isosceles trapezoidal surfaces 2120 b (the length in the up-down direction of the packaging container 2100 ) are set to be lower. Accordingly, while the capacity of the packaging container 2100 is kept constant, the ends of the folded pieces 2150 can be prevented from protruding from the sides from which the folded pieces 2150 adjacent thereto extends.
  • the amount of the blanks 2101 a and 2101 b that is required for producing the packaging container 2100 can be reduced while the capacity of the packaging container 2100 is kept constant.
  • Parts (a) to (d) of FIG. 14 illustrate an example of the method for transforming the container body 2100 .
  • the first portion 2170 a and the second portion 2170 b of the packaging container 2100 that is in the flat state are bent at the peripheral portions thereof (specifically, along the ruled lines between the side seal portion 2140 and the upper isosceles trapezoidal surfaces 2120 a and the lower isosceles trapezoidal surfaces 2120 b ) to pull the first portion 2170 a and the second portion 2170 b apart from each other. Accordingly, a cavity is formed between the first portion 2170 a and the second portion 2170 b , and the upper surface 2110 , the lower surface 2130 , and the side surface 2120 are formed.
  • the sides shared by the upper to-be-folded surfaces 2150 a and the lower to-be-folded surfaces 2150 b and the upper isosceles trapezoidal surfaces 2120 a and the lower isosceles trapezoidal surfaces 2120 b adjacent thereto come closer to each other. Accordingly, the upper to-be-folded surfaces 2150 a and the lower to-be-folded surfaces 2150 b are folded such that the folding ruled lines 2151 extend outward of the cavity, thereby forming the folded pieces 2150 .
  • the side seal portion 2140 is caused to extend along the side surface 2120 so as to be directed toward the upper surface 2110 .
  • the side seal portion 2140 may be caused to extend along the side surface 2120 so as to be directed toward the lower surface 2130 .
  • the folded pieces 2150 are caused to extend along the outer peripheral of the side surface 2120 .
  • the direction along which the folded pieces 2150 are caused to extend is tot limited, and the plurality of folded pieces 2150 may be caused to extend toward the same direction along the circumferential direction of the side surface 2120 as shown in part (c) of FIG. 14 , or the folded pieces 2150 may be caused to extend toward different directions.
  • the folded pieces 2150 may be adhered to the side surface 2120 .
  • the method for adhering the folded pieces 2150 to the side surface 2120 include methods using heat-sealing, a hot-melt adhesive, and the like.
  • the packaging container 2100 that has been transformed from the box state into the flat state is allowed to be used again in the box state, so that it is possible to reuse the packaging container 2100 that is in the flat state.
  • the packaging container 2100 that is in the flat state can be transformed into the box state as shown in part (d) of FIG. 14 .
  • the packaging container 2100 in the box state can be transformed into the flat state through a procedure opposite to the above procedure.
  • the folded pieces 2150 of the packaging container 2100 are separated from the side surface 2120 .
  • first portion 2170 a and the second portion 2170 b are unfolded at the peripheral portions thereof (specifically, along the ruled line between the side seal portion 2140 and the side surface 2120 ).
  • the cavity between the first portion 2170 a and the second portion 2170 b is eliminated, and the first portion 2170 a and the second portion 2170 b are overlaid on each other, whereby the packaging container 2100 can be transformed into the flat state.
  • FIG. 15 shows a blank 2102 according to a modification.
  • parts of peripheral portions of blanks corresponding to the first portion 2170 a and the second portion 2170 b are connected to each other by a connection portion 2180 .
  • the first portion 2170 a and the second portion 2170 b having peripheral portions formed in a circular shape are overlaid on each other by folding the blank 2102 at the connection portion 2180 , and then the upper seal margin 2140 a and the lower seal margin 2140 b are sealed to each other.
  • integrally forming the blank as described above for example, many blanks are allowed to be stamped from one sheet material when forming blanks by stamping the sheet material.
  • the packaging container can be produced at lower cost.
  • connection portion 2180 When transforming the packaging container 2100 , which is formed using the blank 2102 , into the box state by pulling the first portion 2170 a and the second portion 2170 b of the packaging container 2100 apart from each other, the connection portion 2180 is unfolded. In addition, when transforming the packaging container 2100 into the flat state, the connection portion 2180 is folded.
  • the upper isosceles trapezoidal surfaces 2120 a or the lower isosceles trapezoidal surfaces 2120 b may be formed as isosceles trapezoidal surfaces that are not rectangular.
  • the upper isosceles trapezoidal surfaces 2120 a and the lower isosceles trapezoidal surfaces 2120 b as described above, at least any of side surfaces, above and below the side seal portion 2140 , of the side surface 2120 of the packaging container that is in the box state can have a forward tapered or reverse tapered shape. Accordingly, it is possible to provide a packaging container having a shape with high design quality.
  • a spout may be attached to the opening 2111 of the packaging container of the present invention.
  • a spout on which a cap can be mounted is attached to the opening 2111 , it is easy to hermetically seal the opening 2111 .
  • the opening 2111 can be hermetically sealed using a cap or the like after the packaging container folded into the flat state is transformed into the box shape and contents such as a liquid are filled thereinto.
  • a sealing step for ensuring air-tightness in a contents filling line is eliminated, and it is unnecessary to guarantee sealability in the filling line. Therefore, when the packaging container of the present invention is used, it is possible to efficiently fill the contents into the packaging container.
  • the packaging container can be transported in the flat state.
  • the loading efficiency of the packaging container is high, and the transportation and storage costs of the packaging container can be reduced.
  • FIG. 16 is an explanatory perspective view showing the packaging container 31 according to the third embodiment of the present invention.
  • FIG. 20 is a schematic cross-sectional view showing an example of the layer configuration of a laminate 310 used in the packaging container according to the present invention.
  • FIG. 18 is a schematic plan view showing a blank 320 for the packaging container shown in FIG. 16 .
  • the packaging container 31 is a packaging container obtained by shaping the laminate (sheet material) 310 having water-resistant synthetic resin films 311 and 316 attached to a front surface and a back surface of a paper layer 312 , and is characterized by having a spout 36 on a top surface 32 and in that an end surface 38 of the laminate 310 is not present within a height of 3 mm from a bottom surface 33 .
  • the end surface 38 of the laminate 310 is represented by a double line.
  • the actual height from the bottom surface 33 to the top surface 32 is 85 mm
  • the height from the bottom surface 33 to the end surface 38 of the laminate 310 at a side surface is 25 mm. According to an experiment, it is found that, if the end surface of the laminate 310 is not present within a height of 3 mm from the bottom surface 33 , even when the packaging container 31 is left at a wet place, permeation of water from the end surface of the laminate 310 is avoided.
  • the shape of the packaging container 31 is not limited to a rectangular parallelepiped shape as in this example, and may be an optional shape such as a cube shape, a square column shape, and the shapes described above in the first and second embodiments and the modifications thereof.
  • the spout 36 provided on the top surface 32 is a constant-discharge pump, and is capable of discharging a constant amount of contents by pushing an upper portion thereof once.
  • the spout 36 is not limited to such a pump, and a general internal spout, external spout, spray spout, or the like is optionally selectable as the spout 36 .
  • a threaded flange is attached to the packaging container 31 side and the pump is attached thereto such that the pump is detachable therefrom, thereby allowing only the pump to be repeatedly used.
  • the laminate 310 used in the packaging container 31 preferably includes at least the front-surface synthetic resin film 311 on the front surface of the paper layer 312 , and the back-surface synthetic resin film 316 .
  • the laminate 310 further includes a barrier layer 314 , and includes a polyolefin resin layer 313 for bonding the paper layer 312 and the barrier layer 314 , and an adhesive layer 315 for bonding the barrier layer 314 and the back-surface synthetic resin film 316 .
  • printing with ink 317 is performed on the front-surface synthetic resin film 311 .
  • the paper layer 312 thick paper such as milk carton base paper, card base paper, and various cardboards can be used.
  • the paper appropriately has a basis weight of about 200 g/m 2 to 500 g/m 2 and a density of about 0.6 g/cm 3 to 1.1 g/cm 3 .
  • a low-density polyethylene resin (LDPE) and a linear low-density polyethylene resin (LLDPE) are preferable.
  • LDPE low-density polyethylene resin
  • LLDPE linear low-density polyethylene resin
  • Corona treatment is preferably performed on the extruded surface in order to improve the adhesion of the ink when the printing is performed.
  • the barrier layer 314 In the case of using the barrier layer 314 , volatilization of contents is prevented, and the storage stability and the durability as a paper container are improved.
  • a polyethylene terephthalate (PET) film having alumina, silica, aluminum, or the like vapor-deposited thereon is suitably used in addition to aluminum foil.
  • the deposited layer preferably has a thickness of 5 nm to 100 nm, and the PET film preferably has a thickness of about 6 to 25 In the case of using aluminum foil, the aluminum foil preferably has a thickness of about 5 to 15 ⁇ m.
  • the adhesive resin layer 313 is used in this example.
  • a high-density polyethylene resin HDPE
  • LDPE low-density polyethylene resin
  • MDPE medium-density polyethylene resin
  • LLDPE linear low-density polyethylene resin
  • EAA ethylene methacrylic acid copolymer resin
  • EAA ethylene acrylic acid copolymer resin
  • PP polypropylene resin
  • the adhesive resin layer 313 preferably has a thickness of 10 ⁇ m to 60 ⁇ m. If the thickness is less than 10 sufficient strength is generally not obtained. In order to enhance the adhesive strength, corona treatment, ozone treatment, or anchor coating treatment may be performed on the paper surface or the film surface to be bonded.
  • the back-surface synthetic resin film 316 is generally a layer called sealant layer, and a HDPE, a LDPE, a MDPE, and a LLDPE can be used therefor, but a LLDPE is most preferable. In particular, those having a density of 0.925 or less and a melt index of 4 or greater are preferable. There may be a layer partially containing polybutene.
  • the back-surface synthetic resin film 316 appropriately has a thickness of 30 ⁇ m to 100 ⁇ m and is formed by a T-die method or an inflation method.
  • the barrier layer 314 and the back-surface synthetic resin film 316 may be attached together in advance to form an interior film.
  • a dry laminate adhesive or a non-solvent laminate adhesive is used as the attaching method in this case.
  • An application amount of the adhesive is 0.5 to 7.0 g/m 2 .
  • the barrier layer 314 and the back-surface synthetic resin film 316 may be attached together by extrusion using the adhesive resin layer described above.
  • Each of the front-surface and back-surface synthetic plastic resin films 311 and 316 is not limited to a single layer, and may be composed of a plurality of layers, and the material of the frontmost surface and the material of the backmost surface thereof are desirably the same or similar to each other such that, when shaping the packaging container 31 , these surfaces are heated and welded.
  • FIG. 18 shows a state of the blank for the packaging container 31 shown in FIG. 16 , as seen from the front surface side (outer surface side).
  • dotted lines represent mountain fold ruled lines
  • alternate long and short dash lines represent valley fold ruled lines.
  • a top surface plate 321 having a spout attachment hole 37 , a side surface plate 322 , a bottom surface plate 324 , a side surface plate 323 , and a gluing margin 341 are continuously provided with mountain fold ruled lines interposed therebetween.
  • Side surface rectangular plates 337 and 338 are continuously provided on the left and right of the top surface plate 321 with mountain fold ruled lines interposed therebetween, and side surface rectangular plates 339 and 340 are continuously provided on the left and right of the bottom surface plate 324 .
  • Side surface triangular plates 325 and 326 and side surface triangular plates 327 and 328 are continuously provided on the left and right of the side surface plates 322 and 323 , respectively, with valley fold ruled lines interposed therebetween.
  • Side surface to-be-folded plates 329 to 336 are continuously provided on respective sides, of the side surface triangular plates 325 to 328 , which are not in contact with the side surface plates, with mountain fold ruled lines interposed therebetween.
  • a side surface gluing margin 342 is continuously provided to the side surface to-be-folded plates 331 and 333 and the side surface rectangular plate 339 with a valley fold ruled line interposed therebetween, and a side surface gluing margin 343 is continuously provided to the side surface to-be-folded plates 332 and 334 and the side surface rectangular plate 340 with a valley fold ruled line interposed therebetween.
  • the gluing margin 341 is heat-sealed to the back surfaces of the top surface plate 321 and the side surface rectangular plates 337 and 338 to form a square column shape.
  • the side surface gluing margin 342 is brought into contact with and heat-sealed to the side surface rectangular plate 337 and the side surface to-be-folded plates 329 and 335 opposing the side surface gluing margin 342 .
  • Folding is performed such that a mountain fold is made at all the ruled lines on the outer peripheries of the side surface triangular plates 325 and 327 , and heat-sealing is performed to form a folded side surface 35 .
  • shaping is performed for the side surface gluing margin 343 at the opposite side, shaping is performed and a folded side surface 35 is formed in the same manner.
  • FIG. 17 is an explanatory perspective view showing another embodiment of the packaging container 31 according to the present invention.
  • the packaging container 31 shown in FIG. 17 is a packaging container shaped from a blank 320 shown in FIG. 19 .
  • the end surface of the laminate 310 is represented by a double line.
  • the difference from the packaging container 31 shown in FIG. 16 is that, whereas the gluing margin 341 is folded under the top surface plate 321 in the example in FIG. 16 , the gluing margin 341 is folded under the side surface plate 323 in the example in FIG. 17 .
  • FIG. 21 is an explanatory perspective view showing still another embodiment of the packaging container 31 according to the present invention.
  • the side surface to-be-folded plates 329 to 336 which are folded to the folded side surfaces 35 of the packaging container 31 shown in FIG. 16 , are folded to side surfaces 34 .
  • FIG. 22 is an explanatory perspective view showing still another embodiment of the packaging container 31 according to the present invention.
  • the arrangement of the top surface plate 321 , the side surface plates 322 and 323 , and the bottom surface plate 324 is not changed, but a valley fold is made at the two sides, of each of the side surface triangular plates 325 to 328 , which are not in contact with the side surface plate 322 or 323 , and the side surface triangular plates 325 to 328 are folded under the side surface rectangular plates 337 to 340 .
  • the container shape of the packaging container according to the present invention is not particularly limited, and the purpose thereof can be achieved as long as the end surface of the laminate 310 after shaping is located at a height greater than 3 mm from the bottom surface 33 .
  • the packaging container 31 includes the water-resistant layers on the front and back surfaces of the paper, and the end surface of the paper is not present within a height of 3 mm from the bottom surface. Thus, even when the packaging container 31 is put at a location at which the packaging container 31 gets wet, water does not soak into the packaging container 31 through the front and back surfaces and the end surface of the paper. Thus, the packaging container 31 can be used in applications such as use in a bathroom.
  • the packaging container 31 has all the advantages of a paper container such as being able to be discarded or recycled as a paper container when the use of the packaging container 31 ceases.
  • the shape of the packaging container 31 is a rectangular parallelepiped shape, it is also easy to shape the container itself, and there are effects such as saving a space for placing the packaging container 31 in use.
  • the packaging container 31 when the packaging container 31 includes a pump as the spout, the packaging container 31 can be used in many applications such as shampoos, conditioners, and body soaps used in a bathroom.
  • the laminate 310 used in the packaging container 31 includes a barrier layer that prevents permeation of water vapor and oxygen, the long-term storage stability and the durability are improved in the stage of a product or the stage of use.
  • FIG. 23 is an explanatory perspective view showing the packaging container 41 according to the fourth embodiment of the present invention.
  • FIG. 27 is a schematic cross-sectional view showing an example of the layer configuration of a laminate 410 used in the packaging container according to the present invention.
  • FIG. 25 is a schematic plan view showing a blank 420 for the packaging container shown in FIG. 23 .
  • the packaging container 41 according to the fourth embodiment of the present invention is a packaging container obtained by shaping the laminate (sheet material) 410 having water-resistant synthetic resin films 411 and 416 attached to a front surface and a back surface of a paper layer 412 , and is characterized by having a spout 46 on a top surface 42 and in that an end surface 48 of the laminate 410 is not present within a height of 3 mm from a bottom surface 43 and the end surface of the laminate 410 has a portion inclined relative to the bottom surface 43 .
  • the inclined end surface 48 of the laminate 410 is represented by a double line.
  • the actual height from the bottom surface 43 to the top surface 42 is 85 mm
  • the height from the bottom surface 43 to the end surface 48 of the laminate 410 at a side surface is 25 mm. According to an experiment, it is found that, if the end surface of the laminate 410 is not present within a height of 3 mm from the bottom surface 43 , even when the packaging container 41 is left at a wet place, permeation of water from the end surface of the laminate 410 is avoided.
  • the entire end surface of the laminate 410 is inclined relative to the bottom surface 43 , and the angle (a) thereof relative to the bottom surface 43 is about 3°.
  • the shape of the packaging container 41 is not limited to a rectangular parallelepiped shape as in this example, and may be an optional shape such as a cube shape, a square column shape, and the shapes described above in the first and second embodiments and the modifications thereof.
  • the spout 46 provided on the top surface 42 is a constant-discharge pump, and is capable of discharging a constant amount of contents by pushing an upper portion thereof once.
  • the spout 46 is not limited to such a pump, and a general internal spout, external spout, spray spout, or the like is optionally selectable as the spout 46 .
  • a threaded flange is attached to the packaging container 41 side and the pump is attached thereto such that the pump is detachable therefrom, thereby allowing only the pump to be repeatedly used.
  • the laminate 410 used in the packaging container 41 preferably includes at least the front-surface synthetic resin film 411 on the front surface of the paper layer 412 , and the back-surface synthetic resin film 416 .
  • the laminate 410 further includes a barrier layer 414 , and includes a polyolefin resin layer 413 for bonding the paper layer 412 and the barrier layer 414 , and an adhesive layer 415 for bonding the barrier layer 414 and the back-surface synthetic resin film 416 .
  • printing with ink 417 is performed on the front-surface synthetic resin film 411 .
  • the paper layer 412 thick paper such as milk carton base paper, card base paper, and various cardboards can be used.
  • the paper appropriately has a basis weight of about 200 g/m 2 to 500 g/m 2 and a density of about 0.6 g/cm 3 to 1.1 g/cm 3 .
  • a low-density polyethylene resin (LDPE) and a linear low-density polyethylene resin (LLDPE) are preferable.
  • LDPE low-density polyethylene resin
  • LLDPE linear low-density polyethylene resin
  • Corona treatment is preferably performed on the extruded surface in order to improve the adhesion of the ink when the printing is performed.
  • the barrier layer 414 In the case of using the barrier layer 414 , volatilization of contents is prevented, and the storage stability and the durability as a paper container are improved.
  • a polyethylene terephthalate (PET) film having alumina, silica, aluminum, or the like vapor-deposited thereon is suitably used in addition to aluminum foil.
  • the deposited layer preferably has a thickness of 5 nm to 100 nm, and the PET film preferably has a thickness of about 6 to 25 ⁇ m.
  • the aluminum foil In the case of using aluminum foil, the aluminum foil preferably has a thickness of about 5 to 15 ⁇ m.
  • the adhesive resin layer 413 is used in this example.
  • a high-density polyethylene resin HDPE
  • LDPE low-density polyethylene resin
  • MDPE medium-density polyethylene resin
  • LLDPE linear low-density polyethylene resin
  • EAA ethylene methacrylic acid copolymer resin
  • EAA ethylene acrylic acid copolymer resin
  • PP polypropylene resin
  • the adhesive resin layer 413 preferably has a thickness of 10 ⁇ m to 60 ⁇ m. If the thickness is less than 10 sufficient strength is generally not obtained. In order to enhance the adhesive strength, corona treatment, ozone treatment, or anchor coating treatment may be performed on the paper surface or the film surface to be bonded.
  • the back-surface synthetic resin film 416 is generally a layer called sealant layer, and a HDPE, a LDPE, a MDPE, and a LLDPE can be used therefor, but a LLDPE is most preferable. In particular, those having a density of 0.925 or less and a melt index of 4 or greater are preferable. There may be a layer partially containing polybutene.
  • the back-surface synthetic resin film 416 appropriately has a thickness of 30 ⁇ m to 100 ⁇ m and is formed by a T-die method or an inflation method.
  • the barrier layer 414 and the back-surface synthetic resin film 416 may be attached together in advance to form an interior film.
  • a dry laminate adhesive or a non-solvent laminate adhesive is used as the attaching method in this case.
  • An application amount of the adhesive is 0.5 to 7.0 g/m 2 .
  • the barrier layer 414 and the back-surface synthetic resin film 416 may be attached together by extrusion using the adhesive resin layer described above.
  • Each of the front-surface and back-surface synthetic plastic resin films 411 and 416 is not limited to a single layer, and may be composed of a plurality of layers, and the material of the frontmost surface and the material of the backmost surface thereof are desirably the same or similar to each other such that, when shaping the packaging container 41 , these surfaces are heated and welded.
  • FIG. 25 shows a state of the blank for the packaging container shown in FIG. 23 , as seen from the front surface side (outer surface side).
  • dotted lines represent mountain fold ruled lines
  • alternate long and short dash lines represent valley fold ruled lines.
  • a top surface plate 421 having a spout attachment hole 47 , a side surface plate 422 , a bottom surface plate 424 , a side surface plate 423 , and a gluing margin 441 are continuously provided with mountain fold ruled lines interposed therebetween.
  • Side surface rectangular plates 437 and 438 are continuously provided on the left and right of the frontal plate 421 with mountain fold ruled lines interposed therebetween, and side surface rectangular plates 439 and 440 are continuously provided on the left and right of the bottom surface plate 424 .
  • Side surface triangular plates 425 and 426 and side surface triangular plates 427 and 428 are continuously provided on the left and right of the side surface plates 422 and 423 , respectively, with valley fold ruled lines interposed therebetween.
  • Side surface to-be-folded plates 429 to 436 are continuously provided on respective sides, of the side surface triangular plates 425 to 428 , which are not in contact with the side surface plates, with mountain fold ruled lines interposed therebetween.
  • a side surface gluing margin 442 is continuously provided to the side surface to-be-folded plates 431 and 433 and the side surface rectangular plate 439 with a valley fold ruled line interposed therebetween, and a side surface gluing margin 443 is continuously provided to the side surface to-be-folded plates 432 and 434 and the side surface rectangular plate 440 with a valley fold ruled line interposed therebetween.
  • the gluing margin 441 is heat-sealed to the back surfaces of the top surface plate 421 and the side surface rectangular plates 437 and 438 to form a square column shape.
  • the side surface gluing margin 442 is brought into contact with and heat-sealed to the side surface rectangular plate 437 and the side surface to-be-folded plates 429 and 435 opposing the side surface gluing margin 442 .
  • Folding is performed such that a mountain fold is made at all the ruled lines on the outer peripheries of the side surface triangular plates 425 and 427 , and heat-sealing is performed to form a folded side surface 45 .
  • shaping is performed for the side surface gluing margin 443 at the opposite side, shaping is performed and a folded side surface 45 is formed in the same manner.
  • FIG. 24 is an explanatory perspective view showing another embodiment of the packaging container 41 according to the present invention.
  • the packaging container 41 shown in FIG. 24 is a packaging container shaped from a blank 420 shown in FIG. 26 .
  • the end surface of the laminate 410 is represented by a double line.
  • most of the end surface of the laminate 410 is inclined relative to the bottom surface 43 , and the end surface of the laminate 410 includes a horizontal portion 49 .
  • the direction in which the end surface of the laminate 410 is inclined is opposite to that in the example shown in FIG. 23 .
  • the angle (a) of inclination is 5°.
  • the horizontal portion When the horizontal portion is left in the end surface of the laminate 410 as described above, the horizontal portion desirably has a length of 15 mm or less.
  • the folding structure of the laminate 410 of the packaging container 41 according to the fourth embodiment of the present invention is not particularly limited.
  • the side surface to-be-folded plates 429 and 430 which are folded toward the folded side surfaces 45 in the packaging container 41 shown in FIG. 23 , are folded to the side surface 44 side.
  • a side surface plate 422 on which no end surface is exposed and no fold is made is obtained.
  • the packaging container 41 includes the water-resistant layers on the front and back surfaces of the laminate 410 , and the end surface of the paper is not present within a height of 3 mm from the bottom surface. Thus, even when the packaging container 41 is put at a location at which the packaging container 41 gets wet, water does not soak into the packaging container 41 through the front and back surfaces and the end surface of the paper. Thus, the packaging container 41 can be used in applications such as use in a bathroom.
  • the end surface of the laminate 410 has portions inclined relative to the bottom surface, even if water is splashed onto the container from above, the water that has reached the end surface of the paper flows along the inclined end surface and does not accumulate at the end surface. Thus, there is no concern that the end surface of the paper is exposed to water for a long period of time.
  • the packaging container 41 has all the advantages of a paper container such as being able to be discarded or recycled as a paper container when the use of the packaging container 41 ceases.
  • the shape of the container 41 is a rectangular parallelepiped shape, it is also easy to shape the container itself, and there are effects such as saving a space for placing the container 41 in use.
  • the packaging container 41 When the packaging container 41 includes a pump at the spout, the packaging container 41 can be used in many applications such as shampoos, conditioners, and body soaps used in a bathroom.
  • FIGS. 29 to 32 are diagrams showing the packaging container 51 according to the fifth embodiment of the present invention and sheet materials for forming the packaging container 51
  • FIG. 29 and FIG. 30 show a top-side sheet 51 A and a bottom-side sheet 51 B, respectively.
  • the top-side sheet 51 A has a polygonal top surface 51 A 10 at the center thereof.
  • the top surface 51 A 10 is rectangular.
  • An opening 51 A 11 is provided in the top surface 51 A 10 .
  • a plug can be mounted on the opening 51 A 11 in advance.
  • the top-side sheet 51 A has tetragonal top-side side surfaces 51 A 21 to 51 A 24 each having one side that is one of the sides of the top surface 51 A 10 , with each side of the polygonal top surface 51 A 10 as a bending ruled line.
  • the number of the top-side side surfaces 51 A 21 to 51 A 24 is equal to the number of the sides of the polygonal top surface 51 A 10 .
  • the number of the sides of the tetragonal top surface 51 A 10 is four, and the number of the sides of each of the top-side side surfaces 51 A 21 to 51 A 24 is also four.
  • the top-side sheet 51 A has, between the respective top-side side surfaces adjacent to each other, top-side connection pieces 51 A 31 to 51 A 34 that connect the top-side side surfaces 51 A 21 to 51 A 24 to each other. That is, the top-side side surface 51 A 21 and the top-side side surface 51 A 22 are connected to each other by the top-side connection piece 51 A 31 . In addition, the top-side side surface 51 A 22 and the top-side side surface 51 A 23 are connected to each other by the top-side connection piece 51 A 32 . The same applies to the other top-side side surfaces. Bending ruled lines are provided between the respective top-side side surfaces 51 A 21 to 51 A 24 and the respective top-side connection pieces 51 A 31 to 51 A 34 .
  • the gaps between the top-side side surfaces 51 A 21 to 51 A 24 are closed by the top-side connection pieces 51 A 31 to 51 A 34 .
  • the outer shape of a portion obtained by combining the top-side side surfaces 51 A 21 to 51 A 24 with the top-side connection pieces 51 A 31 to 51 A 34 is a rectangle, and the respective top-side connection pieces 51 A 31 to 51 A 34 are located at the corners of the rectangle and close the gaps between the top-side side surfaces 51 A 21 to 51 A 24 .
  • the gap between the top-side side surface 51 A 21 and the top-side side surface 51 A 22 is closed by the top-side connection piece 51 A 31 .
  • the top-side connection pieces 51 A 31 to 51 A 34 have top-side double-folding ruled lines that extend from the respective vertexes of the top surface 51 A 10 so as to bisect the top-side connection pieces 51 A 31 to 51 A 34 . That is, as shown in FIG. 29 in an enlarged manner, for example, the top-side side surface 51 A 23 and the top-side side surface 51 A 24 share a vertex 51 A 10 b of the top surface 51 A 10 . Of the sides that form the top-side side surface 51 A 23 , the side that shares the vertex 51 A 10 b of the top surface 51 A 10 is designated by reference character 51 A 23 b .
  • the side that shares the vertex 51 A 10 b of the top surface 51 A 10 is designated by reference character 51 A 24 b .
  • a top-side double-folding ruled line 51 A 33 c that bisects the angle formed by the side 51 A 23 b and the side 51 A 24 b is provided. That is, in the drawing, the angle ⁇ 1 formed by the side 51 A 23 b and the double-folding ruled line 51 A 33 c is equal to the angle ⁇ 2 formed by the side 51 A 24 b and the top-side double-folding ruled line 51 A 33 c .
  • top-side double-folding ruled line 51 A 33 c has been described above with the top-side connection piece 51 A 33 as an example, top-side double-folding ruled lines 51 A 31 c , 51 A 32 c , and 51 A 34 c are also similarly provided on the other top-side connection pieces 51 A 31 , 51 A 32 , and 51 A 34 .
  • the top-side sheet 51 A has, at the outer side of the rectangular portion obtained by combining the top-side side surfaces 51 A 21 to 51 A 24 with the top-side connection pieces 51 A 31 to 51 A 34 , a top-side fixing portion 51 A 40 at which the top-side sheet 51 A is to be fixed to the bottom-side sheet 51 B.
  • the top-side fixing portion 51 A 40 is formed as a heat-seal region over the entire periphery.
  • a part of the top-side fixing portion 51 A 40 can be formed as a bending ruled line 51 AB that partitions the top-side sheet 51 A and the bottom-side sheet 51 B.
  • an edge 51 Ay of the top-side fixing portion 51 A 40 forms the contour line of the top-side fixing portion 51 A 40 and also forms the edge (contour line) of the top-side sheet 51 A.
  • the shape of the edge 51 Ay of the top-side sheet 51 A is substantially a rectangle, and the corners thereof are chamfered to remove sharp portions.
  • alignment marks 51 Ay 1 and 51 Ay 2 are provided at two locations on the edge 51 Ay of the top-side fixing portion 51 A 40 .
  • Each of the alignment marks 51 Ay 1 and 51 Ay 2 is formed by a recess that is recessed inward from the edge 51 Ay, and the depth 51 DA thereof needs to be not less than 0.5 mm.
  • the depth 51 DA of any one of the alignment marks 51 Ay 1 and 51 Ay 2 is less than 0.5 mm, alignment cannot be ensured, and thus distortion easily occurs in the packaging container 51 that is brought into the box state, as seen from later-described examples.
  • Each of the depths 51 DA of the alignment marks 51 Ay 1 and 51 Ay 2 is desirably not less than 1.0 mm.
  • Each of the alignment marks 51 Ay 1 and 51 Ay 2 can be formed by a projection that projects outward from the edge 51 Ay.
  • the height of the projection needs to be not less than 0.5 mm.
  • the height of the projection is desirably not less than 1.0 mm.
  • One of at least the two alignment marks 51 Ay 1 and 51 Ay 2 can be formed by a recess, and the other mark can be formed by a projection.
  • three or more alignment marks may be provided.
  • the top-side fixing portion 51 A 40 is shown by hatching, and the boundaries between the top-side fixing portion 51 A 40 and the top-side side surfaces 51 A 21 to 51 A 24 and the boundaries between the top-side fixing portion 51 A 40 and the top-side connection pieces 51 A 31 to 51 A 34 are shown by a broken line 51 Ax.
  • a boundary 51 Bx between a bottom-side fixing portion 51 B 40 and bottom-side side surfaces 51 B 21 to 51 B 24 of the bottom-side sheet 51 B described later no bending ruled line is present at the boundaries between the top-side fixing portion 51 A 40 and the top-side side surfaces 51 A 21 to 51 A 24 .
  • no bending ruled line is present at the boundaries between the top-side fixing portion 51 A 40 and the top-side connection pieces 51 A 31 to 51 A 34 .
  • the bottom-side sheet 51 B has the same structure as the top-side sheet 51 A. Specifically, the bottom-side sheet 51 B has a polygonal bottom surface 51 B 10 at the center thereof. The polygonal bottom surface 51 B 10 has the same shape and the same size as (is congruent to) the top surface 51 A 10 .
  • the bottom-side sheet 51 B has the tetragonal bottom-side side surfaces 51 B 21 to 51 B 24 each having one side that is one of the sides of the polygonal bottom surface 51 B 10 , with each side of the bottom surface 51 B 10 as a bending ruled line, and the number of the bottom-side side surfaces 51 B 21 to 51 B 24 is equal to the number of the sides of the polygonal bottom surface 51 B 10 .
  • These bottom-side side surfaces 51 B 21 to 51 B 24 also have the same shape and the same size as the top-side side surfaces 51 A 21 to 51 A 24 , respectively.
  • the bottom-side sheet 51 B has, between the respective bottom-side side surfaces 51 B 21 to 51 B 24 adjacent to each other, bottom-side connection pieces 51 B 31 to 51 B 34 that connect the bottom-side side surfaces 51 B 21 to 51 B 24 to each other and also close the gaps therebetween.
  • These bottom-side connection pieces 51 B 31 to 51 B 34 have the same shape and the same size as the top-side connection pieces 51 A 31 to 51 A 34 .
  • bending ruled lines are provided between the respective bottom-side side surfaces 51 B 21 to 51 B 24 and the respective bottom-side connection pieces 51 B 31 to 51 B 34 .
  • bottom-side double-folding ruled lines 51 B 31 c to 51 B 34 c that extend from the respective vertexes of the bottom surface 51 B 10 so as to bisect the bottom-side connection pieces 51 B 31 to 51 B 34 are provided on the respective bottom-side connection pieces 51 B 31 to 51 B 34 .
  • the bottom-side sheet 51 B has, at the outer side of a rectangular portion obtained by combining the bottom-side side surfaces 51 B 21 to 51 B 24 with the bottom-side connection pieces 51 B 31 to 51 B 34 , the bottom-side fixing portion 51 B 40 at which the bottom-side sheet 51 B is to be fixed to the top-side sheet 51 A.
  • the bottom-side fixing portion 51 B 40 is a heat-seal region over the entire periphery.
  • a contour line 51 By of the bottom-side fixing portion 51 B 40 forms the contour line of the bottom-side fixing portion 51 B 40 and also forms the edge (contour line) of the bottom-side sheet 51 B.
  • the outer shape of the bottom-side fixing portion 51 B 40 is substantially a rectangle.
  • the outer shape of the bottom-side sheet 51 B is formed so as to be smaller than the outer shape of the top-side sheet 51 A, as an example.
  • reference character 51 LA denotes the length in the horizontal direction of the top-side sheet 51 A
  • reference character 51 LB denotes the length in the horizontal direction of the bottom-side sheet 51 B.
  • the difference therebetween that is, the difference between the length 51 LA in the horizontal direction of the top-side sheet 51 A and the length 51 LB in the horizontal direction of the bottom-side sheet 51 B, is desirably not less than 0.6 mm.
  • both sheets 51 A and 51 B are arranged such that the edges thereof are displaced relative to each other by 0.3 mm or greater. Accordingly, the edge 51 By of the bottom-side sheet 51 B is covered with the top-side sheet 51 A, and thus is not exposed. Even when a slight positional displacement occurs between the top-side sheet 51 A and the bottom-side sheet 51 B, the edge 51 By of the bottom-side sheet 51 B does not become exposed.
  • the difference between the length 51 LA in the horizontal direction of the top-side sheet 51 A and the length 51 LB in the horizontal direction of the bottom-side sheet 51 B is desirably not less than 1.0 mm.
  • reference character 51 HA denotes the length in the vertical direction of the top-side sheet 51 A
  • reference character 51 HB denotes the length in the vertical direction of the bottom-side sheet 51 B.
  • the difference therebetween that is, the difference between the length 51 HA in the vertical direction of the top-side sheet 51 A and the length 51 HB in the vertical direction of the bottom-side sheet 51 B, is also desirably not less than 0.6 mm. This difference is also desirably not less than 1.0 mm.
  • the length of the top-side sheet 51 A is longer than the length of the bottom-side sheet 51 B in both the vertical direction and the horizontal direction, the length of the top-side sheet 51 A is longer than the length of the bottom-side sheet 51 B in any direction.
  • the edge 51 BY of the bottom-side sheet 51 B does not become exposed.
  • a bending ruled line 51 Bx is provided at the boundaries between the bottom-side fixing portion 51 B 40 and the bottom-side side surfaces 51 B 21 to 51 B 24 of the bottom-side sheet 51 B and the boundaries between the bottom-side fixing portion 51 B 40 and the bottom-side connection pieces 51 B 31 to 51 B 34 . Since no bending ruled line is present at the boundary of the top-side fixing portion 51 A 40 of the top-side sheet 51 A, when both sheets 51 A and 51 B are overlaid on and fixed to each other and brought into a box state, both fixing portions 51 A 40 and 51 B 40 fixed to each other are bent toward the bottom-side sheet 51 B side due to the bending ruled line 51 Bx, and the outer side thereof is covered with the top-side sheet 51 A. Thus, also, in the box state, the edge 51 By of the bottom-side sheet 51 B is not exposed on the outer surface of the packaging container 51 .
  • alignment marks 51 By 1 and 51 By 2 are provided at two locations on the edge 51 By of the bottom-side fixing portion 51 B 40 .
  • the two alignment marks 51 By 1 and 51 By 2 need to be located at positions corresponding to the alignment marks 51 Ay 1 and 51 Ay 2 of the top-side sheet 51 A. That is, both alignment marks 51 Ay 1 and 51 Ay 2 and both alignment marks 51 By 1 and 51 By 2 are located at the same positions when the top-side sheet 51 A and the bottom-side sheet 51 B are accurately aligned with and overlaid on each other.
  • the outer shape of the bottom-side sheet 51 B is formed so as to be smaller than the outer shape of the top-side sheet 51 A
  • the two alignment marks 51 Ay 1 and 51 Ay 2 of the top-side sheet 51 A are seen at the outer side of the edge 51 By of the bottom-side sheet 51 B as shown in FIG. 31 .
  • the two alignment marks 51 By 1 and 51 By 2 of the bottom-side sheet 51 B are seen, and thus it is easy to align both alignment marks 51 Ay 1 and 51 Ay 2 and both alignment marks 51 By 1 and 51 By 2 with each other.
  • the top-side sheet 51 A and the bottom-side sheet 51 B can be accurately aligned with each other.
  • each of the alignment marks 51 By 1 and 51 By 2 can be formed by a recess that is recessed inward from the edge 51 By, or by a projection that projects outward from the edge 51 Ay.
  • each of the depths 51 DB of the alignment marks 51 By 1 and 51 By 2 needs to be not less than 0.5 mm, and is desirably not less than 1 mm, similar to the alignment marks 51 Ay 1 and 51 Ay 2 .
  • each of the alignment marks 51 By 1 and 51 By 2 is formed by a projection
  • the height of the projection needs to be not less than 0.5 mm and is desirably not less than 1 mm.
  • One of the alignment marks 51 By 1 and 51 By 2 may be formed by a recess, and the other alignment mark may be formed by a projection, or three or more alignment marks may be provided.
  • the packaging container 51 can be produced as described below.
  • the packaging container 51 in the flat state can be produced by aligning and overlaying the top-side sheet 51 A and the bottom-side sheet 51 B on each other and heat-sealing both fixing portions 51 A 40 and 51 B 40 to each other (see FIG. 31 ). Since the width of the bottom-side fixing portion 51 B 40 is smaller than that of the top-side fixing portion 51 A 40 , the fixing portions 51 A 40 and 51 B 40 does not need to be heat-sealed over the entire width, but are desirably heat-sealed such that the fixing portions 51 A 40 and 51 B 40 are fixed to each other over the entire periphery.
  • a portion formed by heat-sealing both fixing portions 51 A 40 and 51 B 40 to each other is referred to as a container fixed portion 5140 .
  • the bottom-side sheet 51 B having a smaller outer shape is desirably overlaid on the top-side sheet 51 A having a larger outer shape.
  • the alignment marks 51 Ay 1 and 51 Ay 2 of the top-side sheet 51 A are seen to protrude outside the edge 51 By of the bottom-side sheet 51 B.
  • top surface 51 A 10 and the bottom surface 51 B 10 have the same shape and the same size, and the top-side side surfaces 51 A 21 to 51 A 24 also have the same shape and the same size as the bottom-side side surfaces 51 B 21 to 51 B 24 , when the top-side sheet 51 A and the bottom-side sheet 51 B are accurately aligned with and overlaid on each other, these surfaces are exactly overlaid on each other.
  • top-side connection pieces 51 A 31 to 51 A 34 and the bottom-side connection pieces 51 B 31 to 51 B 34 have the same shape and the same size, these pieces are exactly placed on each other.
  • the top-side double-folding ruled lines 51 A 31 c to 51 A 34 c which are provided on the top-side connection pieces 51 A 31 to 51 A 34 , are exactly placed on the bottom-side double-folding ruled lines 51 B 31 c to 51 B 34 c , which are provided on the bottom-side connection pieces 51 B 31 to 51 B 34 , and the boundary 51 Ax of the top-side fixing portion 51 A 40 in the top-side sheet 51 A and the boundary 51 Bx of the bottom-side fixing portion 51 B 40 in the bottom-side sheet 51 B are also exactly placed on each other.
  • top surface 51 A 10 and the bottom surface 51 B 10 are exactly placed on each other, the top-side side surfaces 51 A 21 to 51 A 24 and the bottom-side side surfaces 51 B 21 to 51 B 24 are exactly placed on each other, the top-side connection pieces 51 A 31 to 51 A 34 and the bottom-side connection pieces 51 B 31 to 51 B 34 are exactly placed on each other, and the boundary 51 Ax of the top-side fixing portion 51 A 40 in the top-side sheet 51 A and the boundary 51 Bx of the bottom-side fixing portion 51 B 40 in the bottom-side sheet 51 B are exactly placed on each other as described above, also when the packaging container 51 is brought into the box state, distortion does not occurs in the packaging container 51 , and the packaging container 51 can be obtained as designed.
  • edge (contour line) 51 Ay of the top-side sheet 51 A is formed so as to be larger than the edge (contour line) 51 By of the bottom-side sheet 51 B, the positions of both edges 51 Ay and 51 By do not coincide with each other, and the edge 51 Ay of the top-side sheet 51 A is located outside the edge 51 By of the bottom-side sheet 51 B.
  • the distance 5 d L in the horizontal direction between the edge 51 Ay of the top-side sheet 51 A and the edge 51 By of the bottom-side sheet 51 B is not less than 0.3 mm.
  • the distance 5 d H in the vertical direction between the edge 51 Ay of the top-side sheet 51 A and the edge 51 By of the bottom-side sheet 51 B is also not less than 0.3 mm, and the edge 51 Ay of the top-side sheet 51 A and the edge 51 By of the bottom-side sheet 51 B are formed so as to be displaced relative to each other by 0.3 mm or greater over the entire periphery excluding the alignment mark portions.
  • FIG. 32 shows the packaging container 51 in a state where the packaging container 51 is transformed into the box state and the respective connection pieces 51 A 31 to 51 A 34 and 51 B 31 to 51 B 34 are bent onto the outer surface.
  • the top-side connection pieces 51 A 31 to 51 A 34 and the bottom-side connection pieces 51 B 31 to 51 B 34 may be folded double such that a mountain fold is made with respect to the container outer surface at each of the top-side double-folding ruled lines 51 A 31 c to 51 A 34 c and the bottom-side double-folding ruled lines 51 B 31 c to 51 B 34 c , which are located at the centers of the top-side connection pieces 51 A 31 to 51 A 34 and the bottom-side connection pieces 51 B 31 to 51 B 34 .
  • Describing the top-side connection piece 51 A 33 with reference to the enlarged view of FIG. 29 by folding double the top-side connection piece 51 A 33 at the top-side double-folding ruled line 51 A 33 c , the side 51 A 23 b of the top-side side surface 51 A 23 and the side 51 A 24 b of the top-side side surface 51 A 24 , which are located at both sides of the top-side connection piece 51 A 33 , are placed on each other.
  • the top-side connection piece 51 A 33 of the top-side sheet 51 A and the bottom-side connection piece 51 B 33 of the bottom-side sheet 51 B are exactly placed on each other, and the top-side double-folding ruled line 51 A 33 c and the bottom-side double-folding ruled line 51 B 33 c thereof are also exactly placed on each other.
  • the top-side connection piece 51 A 33 of the top-side sheet 51 A is folded double at the top-side double-folding ruled line 51 A 33 c
  • the bottom-side connection piece 51 B 33 of the bottom-side sheet 51 B is also folded double at the bottom-side double-folding ruled line 51 B 33 c .
  • the side 51 B 23 b of the bottom-side side surface 51 B 23 and the side 51 B 24 b of the bottom-side side surface 51 B 24 which are located at both sides of the bottom-side connection piece 51 B 33 , are also exactly placed on each other.
  • a side surface 5123 of the packaging container 51 in the box state is formed by both side surfaces 51 A 23 and 51 B 23 .
  • top-side connection piece 51 A 33 of the top-side sheet 51 A and the bottom-side connection piece 51 B 33 of the bottom-side sheet 51 B are also contiguous to each other via the container fixed portion 5140 , when a portion composed of both connection pieces 51 A 33 and 51 B 33 is referred to as a container connection piece 5133 , the above side surfaces are connected to each other and also closed by the container connection piece 5133 . That is, the side surface 5123 composed of the top-side side surface 51 A 23 and the bottom-side side surface 51 B 23 and a side surface 5124 composed of the top-side side surface 51 A 24 and the bottom-side side surface 51 B 24 are connected to each other and further closed by the container connection piece 5133 without any gap being formed therebetween.
  • a side surface 5121 composed of the top-side side surface 51 A 21 and the bottom-side side surface 51 B 21 and a side surface 5122 composed of the top-side side surface 51 A 22 and the bottom-side side surface 51 B 22 are formed by folding double a container connection piece 5131 , composed of the top-side connection piece 51 A 31 and the bottom-side connection piece 51 B 31 , such that a mountain fold is made with respect to the container outer surface at each of the top-side double-folding ruled line 51 A 31 c and the bottom-side double-folding ruled line 51 B 31 c , which are located at the centers of the top-side connection piece 51 A 31 and the bottom-side connection piece 51 B 31 , and the side surface 5121 and the side surface 5122 are connected to each other and closed by the container connection piece 5131 .
  • the side surface 5122 composed of the top-side side surface 51 A 22 and the bottom-side side surface 51 B 22 and the side surface 5123 composed of the top-side side surface 51 A 23 and the bottom-side side surface 51 B 23 are formed by folding double a container connection piece 5132 , composed of the top-side connection piece 51 A 32 and the bottom-side connection piece 51 B 32 , such that a mountain fold is made with respect to the container outer surface at each of the top-side double-folding ruled line 51 A 32 c and the bottom-side double-folding ruled line 51 B 32 c , which are located at the centers of the top-side connection piece 51 A 32 and the bottom-side connection piece 51 B 32 , and the side surface 5122 and the side surface 5123 are connected to each other and closed by the container connection piece 5132 .
  • a side surface 5124 composed of the top-side side surface 51 A 24 and the bottom-side side surface 51 B 24 and the side surface 5121 composed of the top-side side surface 51 A 21 and the bottom-side side surface 51 B 21 are formed by folding double a connection piece 5134 , composed of the top-side connection piece 51 A 34 and the bottom-side connection piece 51 B 34 , such that a mountain fold is made with respect to the container outer surface at each of the top-side double-folding ruled line 51 A 34 c and the bottom-side double-folding ruled line 51 B 34 c , which are located at the centers of the top-side connection piece 51 A 34 and the bottom-side connection piece 51 B 34 , and the side surface 5124 and the side surface 5121 are connected to each other and closed by the container connection piece 5134 .
  • the packaging container 51 in the box state has the top surface 51 A 10 and the bottom surface 51 B 10 , the side surfaces 5121 to 5124 are provided at the peripheries thereof, and the gaps between the side surfaces 5121 to 5124 are closed by the container connection pieces 5131 to 5134 .
  • the packaging container 51 is in a hermetically sealed state except for the opening 51 A 11 .
  • the bending ruled line is provided at the boundary 51 Bx of the bottom-side fixing portion 51 B 40 of the bottom-side sheet 51 B, and no bending ruled line is provided at the boundary 51 Ax of the top-side fixing portion 51 A 40 of the top-side sheet 51 A.
  • the container fixed portion 5140 which is formed by heat-sealing both fixing portions 51 A 40 and 51 B 40 , is bent toward the bottom-side sheet 51 B.
  • the bottom-side fixing portion 51 B 40 is bent toward the bottom-side sheet 51 B at the bending ruled line provided at the boundary 51 Bx, and the top-side fixing portion 51 A 40 of the top-side sheet 51 A is overlaid on the outer surface side of the bottom-side fixing portion 51 B 40 of the bottom-side sheet 51 B without being bent at the boundary 51 Ax. Therefore, the edge 51 By of the bottom-side sheet 51 B is covered with the top-side fixing portion 51 A 40 of the top-side sheet 51 A and is not exposed on the outer surface.
  • connection pieces 5131 to 5134 are desirably folded double while air or the like is blown in through the opening 511 .
  • FIG. 32 shows the packaging container 51 in a state where the connection pieces 5131 to 5134 are bent and overlaid on the respective side surfaces 5121 to 5124 of the packaging container 1 as described above.
  • connection pieces 5131 to 5134 can be detachably fixed to the respective side surfaces 5121 to 5124 by means of an adhesive, an adhesive tape, or a joining member such as a hook and loop fastener and a snap button.
  • the connection pieces 5131 to 5134 can be detachably fixed to the respective side surfaces 5121 to 5124 by the heat of hot air or the like and application of pressure.
  • the container fixed portion 5140 may be held and pulled outward of the packaging container 51 .
  • the double-folded connection pieces 5131 to 5134 are unfolded, and the packaging container 51 is transformed into the flat state.
  • the packaging container 51 can be used as described below.
  • the packaging container 51 is produced in the flat state, stored in this state, and transferred to a contents filling step. Then, in the contents filling step, the packaging container 51 is transformed into the box state, then contents are filled thereinto through the opening 51 A 11 , and the opening 51 A 11 is closed, whereby a package containing the contents can be prepared.
  • the package in the box state containing the contents as described above can be returned to the flat state again after the contents are discharged. It is possible to repeatedly transform the package between the box state and the flat state as described above.
  • top-side sheet 51 A or the bottom-side sheet 51 B for example, a laminated film having a thermoplastic resin layer or a sealant layer layered on a base material layer made of paper can be suitably used.
  • a barrier layer, a functional film, or the like may be added as appropriate according to a required function.
  • the end surface of the end portion of the top-side sheet 51 A or the bottom-side sheet 51 B may be protected by a known method.
  • both the top-side sheet 51 A and the bottom-side sheet 51 B are formed by one sheet, and the top-side sheet 51 A and the bottom-side sheet 51 B are partitioned by the bending ruled line 51 AB, and the others are the same as the first example.
  • the top-side fixing portion of the top-side sheet 51 A is composed of the bending ruled line 51 AB and a heat-seal region and configured to surround the entire periphery of the top-side sheet 51 A with a combination of the bending ruled line 51 AB and the heat-seal region.
  • the bottom-side fixing portion of the bottom-side sheet 51 B is composed of the bending ruled line 51 AB and a heat-seal region and configured to surround the entire periphery of the bottom-side sheet 51 B with a combination of the bending ruled line 51 AB and the heat-seal region.
  • a top surface 52 A 10 of a top-side sheet 52 A is formed in a regular hexagon shape
  • a bottom surface 52 B 10 of a bottom-side sheet 52 B is formed in a regular hexagon shape that is the same in shape and size as that of the top surface 52 A 10 .
  • Two or more alignment marks formed by recesses 52 Ay 1 and 52 Ay 2 or 52 By 1 and 52 By 2 having a depth of 0.5 mm or greater are provided at each of an edge 52 Ay of the top-side sheet 52 A and an edge 52 By of the bottom-side sheet 52 B.
  • a length 52 LA in the horizontal direction of the top-side sheet 52 A is longer than a length 52 LB in the horizontal direction of the bottom-side sheet 52 B, and the difference therebetween is not less than 0.3 mm.
  • a length 52 HA in the vertical direction of the top-side sheet 52 A is also longer than a length 52 HB in the vertical direction of the bottom-side sheet 52 B, and the difference therebetween is also not less than 0.3 mm.
  • the length of the top-side sheet 52 A is longer than the length of the bottom-side sheet 52 B in any direction by 0.3 mm or greater.
  • the packaging container 52 when the packaging container 52 is in any of the box state and the flat state, the edge 52 By of the bottom-side sheet 52 B is covered with the top-side sheet 52 A and is not exposed.
  • the packaging container 52 can also be repeatedly transformed between the box state and the flat state by the same method as in the first modification.
  • a top surface 53 A 10 of a top-side sheet 53 A is formed in a regular triangle shape
  • a bottom surface 53 B 10 of a bottom-side sheet 53 B is formed in a regular triangle shape that is the same in shape and size as that of the top surface 53 A 10 .
  • Two or more alignment marks formed by recesses 53 Ay 1 and 53 Ay 2 or 53 By 1 and 53 By 2 having a depth of 0.5 mm or greater are provided at each of an edge 53 Ay of the top-side sheet 53 A and an edge 53 By of the bottom-side sheet 53 B.
  • Each of the contour line 53 Ay of the top-side sheet 53 A and the edge 53 By of the bottom-side sheet 53 B is formed by connecting three circular arcs, a length 53 LA in the horizontal direction of the top-side sheet 53 A is longer than a length 53 LB in the horizontal direction of the bottom-side sheet 53 B, and the difference therebetween is not less than 0.3 mm. Therefore, the length of the top-side sheet 53 A is longer than the length of the bottom-side sheet 53 B in any direction by 0.3 mm or greater, and, when the packaging container 53 is in any of the box state and the flat state, the edge 53 By of the bottom-side sheet 53 B is covered with the top-side sheet 53 A and is not exposed.
  • the packaging container 53 can also be repeatedly transformed between the box state and the flat state by the same method as in the first modification and the second modification.
  • the top-side sheet 51 A and the bottom-side sheet 51 B which are substantially rectangular as shown in FIG. 29 and FIG. 30 , were used.
  • the top-side sheet 51 A has, at two locations on the edge 51 Ay thereof, alignment marks 51 Ay 1 and 51 Ay 2 formed by recesses that are recessed inward, and each of the depths 51 DA of the alignment marks 51 Ay 1 and 51 Ay 2 is 5.0 mm.
  • the bottom-side sheet 51 B has, at the positions, on the edge 51 By, corresponding to the alignment marks 51 Ay 1 and 51 Ay 2 , two alignment marks 51 By 1 and 51 By 2 formed by recesses that are recessed inward.
  • Each of the depths 51 DB of the alignment marks 51 By 1 and 51 By 2 is 3.5 mm.
  • the length 51 LA in the horizontal direction of the top-side sheet 51 A is 180.0 mm, and the length 51 HA in the vertical direction of the top-side sheet 51 A is 200.0 mm.
  • the length 51 LB in the horizontal direction of the bottom-side sheet 51 B is 177.0 mm, and the length 51 HB in the vertical direction of the bottom-side sheet 51 B is 197.0 mm.
  • the top-side sheet 51 A is longer than the bottom-side sheet 51 B by 3.0 mm in any of the vertical direction and the horizontal direction.
  • the top-side sheet 51 A and the bottom-side sheet 51 B described above were overlaid and aligned with each other using the alignment marks 51 Ay 1 , 51 Ay 2 , 51 By 1 , and 51 By 2 , and then the fixing portions 51 A 40 and 51 B 40 at the peripheries were heat-sealed to each other, thereby producing a packaging container 51 in a flat state.
  • connection pieces 5131 to 5134 are bent and overlaid onto the respective side surfaces 5121 to 5124 of the packaging container 51 .
  • a total of ten packaging containers 51 in a box state were produced, and presence/absence of a positional displacement between the top-side sheet 51 A and the bottom-side sheet 51 B and presence/absence of distortion of each packaging container 51 in the box state were checked.
  • presence/absence of a positional displacement when a positional displacement of 0.5 mm or greater was present between the top-side sheet 51 A and the bottom-side sheet 51 B, “presence of a positional displacement” was determined. The number of packaging containers 51 having “presence of a positional displacement” was counted. In addition, regarding presence/absence of distortion, the number of packaging containers 51 in which distortion had occurred was counted. The results are shown in Table 1.
  • Packaging containers 51 in a box state were produced in the same manner as Example 5-1, except that, of the two alignment marks 51 Ay 1 and 51 Ay 2 of the top-side sheet 51 A, the alignment mark 51 A 1 was formed by a recess that is recessed inward, and the alignment mark 51 Ay 2 was formed by a projection that projects outward, and, of the two alignment marks 51 By 1 and 51 By 2 of the bottom-side sheet 51 B, the alignment mark 51 By 1 was formed as a projection that projects outward, and the alignment mark 51 By 2 was formed by a recess that is recessed inward. Finally, the connection pieces 5131 to 5134 were bent and overlaid onto the respective side surfaces 5121 to 5124 of the packaging container 51 .
  • the alignment mark 51 By 1 corresponds to the alignment mark 51 Ay 1
  • the alignment mark 51 By 2 corresponds to the alignment mark 51 Ay 2
  • each of the depths of the alignment marks 51 Ay 1 and 51 By 2 formed by the recesses is 3.5 mm
  • each of the heights of the alignment marks 51 Ay 2 and 51 By 1 formed by the projections is 5.0 mm.
  • This example is an example in which the two alignment marks 51 Ay 1 and 51 Ay 2 of the top-side sheet 51 A and the two alignment marks 51 By 1 and 51 By 2 of the bottom-side sheet 51 B were formed by recesses that are recessed inward, but each of the depths of some of the alignment marks was less than 0.5 mm.
  • each of the depths of the alignment marks 51 Ay 1 and 51 By 2 was 0.6 mm, but each of the depths of the alignment marks 51 Ay 2 and 51 By 1 was 0.3 mm.
  • the others are the same as in Example 5-1.
  • the results of presence/absence of a positional displacement and presence/absence of distortion of each packaging container 51 are shown in Table 1.
  • This example is an example in which only one alignment mark was provided on each of the top-side sheet 51 A and the bottom-side sheet 51 B.
  • the alignment mark of the top-side sheet 51 A was formed by a recess having a depth of 5.0 mm.
  • the alignment mark of the bottom-side sheet 51 B was formed by a recess having a depth of 3.5 mm.
  • the others are the same as in Example 5-1.
  • the results of presence/absence of a positional displacement and presence/absence of distortion of each packaging container 51 are shown in Table 1.
  • each container When no alignment mark is provided (Example 5-3), each container exhibits a positional displacement of 0.5 mm or greater between the top-side sheet 51 A and the bottom-side sheet 51 B. Accordingly, when the packaging container 51 is brought into the box state, the functions as a packaging container are not deteriorated, but distortion in the shape thereof occurs.
  • the cause of occurrence of distortion in the shape of the packaging container when the packaging container is brought into the box state is that a positional displacement of 0.5 mm or greater is present between the top-side sheet and the bottom-side sheet. Unless a positional displacement of 0.5 mm or greater is present between the top-side sheet and the bottom-side sheet, distortion does not occur in the packaging container in the box state.
  • each alignment mark is formed by a recess that is recessed from the edge or by a projection that projects from the edge, and the depth or height of each alignment mark is not less than 0.5 mm, each alignment mark is seen at the end portion. Therefore, it is possible to easily and accurately align these sheet materials with each other. As a result, when the packaging container 51 is brought into the box state, distortion does not occur in the packaging container 51 .
  • the outer shape of the top-side sheet 51 A and the outer shape of the bottom-side sheet 51 B may be the same as long as the alignment marks 51 Ay 1 , 51 Ay 2 , 51 By 1 , and 51 By 2 are provided.
  • FIGS. 40 to 43 are diagrams showing the packaging container 61 according to the sixth embodiment of the present invention and sheet materials for forming the packaging container 61
  • FIG. 40 and FIG. 41 show a top-side sheet 61 A and a bottom-side sheet 61 B, respectively.
  • the top-side sheet 61 A has a polygonal top surface 61 A 10 at the center thereof.
  • the top surface 61 A 10 is rectangular.
  • An opening 61 A 11 is provided in the top surface 61 A 10 .
  • a plug can be mounted on the opening 61 A 11 in advance.
  • the top-side sheet 61 A has tetragonal top-side side surfaces 61 A 21 to 61 A 24 each having one side that is one of the sides of the top surface 61 A 10 , with each side of the polygonal top surface 61 A 10 as a bending ruled line.
  • the number of the top-side side surfaces 61 A 21 to 61 A 24 is equal to the number of the sides of the polygonal top surface 61 A 10 .
  • the number of the sides of the tetragonal top surface 61 A 10 is four, and the number of the sides of each of the top-side side surfaces 61 A 21 to 61 A 24 is also four.
  • the top-side sheet 61 A has, between the respective top-side side surfaces adjacent to each other, top-side connection pieces 61 A 31 to 61 A 34 that connect the top-side side surfaces 61 A 21 to 61 A 24 to each other. That is, the top-side side surface 61 A 21 and the top-side side surface 61 A 22 are connected to each other by the top-side connection piece 61 A 31 . In addition, the top-side side surface 61 A 22 and the top-side side surface 61 A 23 are connected to each other by the top-side connection piece 61 A 32 . The same applies to the other top-side side surfaces. Bending ruled lines are provided between the respective top-side side surfaces 61 A 21 to 61 A 24 and the respective top-side connection pieces 61 A 31 to 61 A 34 .
  • the gaps between the top-side side surfaces 61 A 21 to 61 A 24 are closed by the top-side connection pieces 61 A 31 to 61 A 34 .
  • the outer shape of a portion obtained by combining the top-side side surfaces 61 A 21 to 61 A 24 with the top-side connection pieces 61 A 31 to 61 A 34 is a rectangle, and the respective top-side connection pieces 61 A 31 to 61 A 34 are located at the corners of the rectangle and close the gaps between the top-side side surfaces 61 A 21 to 61 A 24 .
  • the gap between the top-side side surface 61 A 21 and the top-side side surface 61 A 22 is closed by the top-side connection piece 61 A 31 .
  • the top-side connection pieces 61 A 31 to 61 A 34 have top-side double-folding ruled lines that extend from the respective vertexes of the top surface 61 A 10 so as to bisect the top-side connection pieces 61 A 31 to 61 A 34 . That is, as shown in FIG. 40 in an enlarged manner, for example, the top-side side surface 61 A 23 and the top-side side surface 61 A 24 share a vertex 61 A 10 b of the top surface 61 A 10 . Of the sides that form the top-side side surface 61 A 23 , the side that shares the vertex 61 A 10 b of the top surface 61 A 10 is designated by reference character 61 A 23 b .
  • the sides that form the top-side side surface 61 A 24 the side that shares the vertex 61 A 10 b of the top surface 61 A 10 is designated by reference character 61 A 24 b .
  • Atop-side double-folding ruled line 61 A 33 c that bisects the angle formed by the side 61 A 23 b and the side 61 A 24 b is provided. That is, in the drawing, the angle ⁇ 1 formed by the side 61 A 23 b and the double-folding ruled line 61 A 33 c is equal to the angle ⁇ 2 formed by the side 61 A 24 b and the top-side double-folding ruled line 61 A 33 c .
  • top-side double-folding ruled line 61 A 33 c has been described above with the top-side connection piece 61 A 33 as an example, top-side double-folding ruled lines 61 A 31 c , 61 A 32 c , and 61 A 34 c are also similarly provided on the other top-side connection pieces 61 A 31 , 61 A 32 , and 61 A 34 .
  • the top-side sheet 61 A has, at the outer side of the rectangular portion obtained by combining the top-side side surfaces 61 A 21 to 61 A 24 with the top-side connection pieces 61 A 31 to 61 A 34 , a top-side fixing portion 61 A 40 at which the top-side sheet 61 A is to be fixed to the bottom-side sheet 61 B.
  • the top-side fixing portion 61 A 40 is formed as a heat-seal region over the entire periphery.
  • a part of the top-side fixing portion 61 A 40 can be formed as a bending ruled line 61 AB that partitions the top-side sheet 61 A and the bottom-side sheet 61 B.
  • an edge 61 Ay of the top-side fixing portion 61 A 40 forms the contour line of the top-side fixing portion 61 A 40 and also forms the edge (contour line) of the top-side sheet 61 A.
  • the shape of the edge 61 Ay of the top-side sheet 61 A is substantially a rectangle, and the corners thereof are chamfered to remove sharp portions.
  • the top-side fixing portion 61 A 40 is shown by hatching, and the boundaries between the top-side fixing portion 61 A 40 and the top-side side surfaces 61 A 21 to 61 A 24 and the boundaries between the top-side fixing portion 61 A 40 and the top-side connection pieces 61 A 31 to 61 A 34 are shown by a broken line 61 Ax.
  • a boundary 61 Bx between a bottom-side fixing portion 61 B 40 and bottom-side side surfaces 61 B 21 to 61 B 24 of the bottom-side sheet 61 B described later no bending ruled line is present at the boundaries between the top-side fixing portion 61 A 40 and the top-side side surfaces 61 A 21 to 61 A 24 .
  • no bending ruled line is present at the boundaries between the top-side fixing portion 61 A 40 and the top-side connection pieces 61 A 31 to 61 A 34 .
  • the bottom side sheet 61 B has the same structure as the top-side sheet 61 A. Specifically, the bottom side sheet 61 B has a polygonal bottom surface 61 B 10 at the center thereof. The polygonal bottom surface 61 B 10 has the same shape and the same size as the top surface 61 A 10 .
  • the bottom side sheet 61 B has the tetragonal bottom-side side surfaces 61 B 21 to 61 B 24 each having one side that is one of the sides of the polygonal bottom surface 61 B 10 , with each side of the bottom surface 61 B 10 as a bending ruled line, and the number of the bottom-side side surfaces 61 B 21 to 61 B 24 is equal to the number of the sides of the polygonal bottom surface 61 B 10 .
  • These bottom-side side surfaces 61 B 21 to 61 B 24 also have the same shape and the same size as the top-side side surfaces 61 A 21 to 61 A 24 , respectively.
  • the bottom side sheet 61 B has, between the respective bottom-side side surfaces 61 B 21 to 61 B 24 adjacent to each other, bottom-side connection pieces 61 B 31 to 61 B 34 that connect the bottom-side side surfaces 61 B 21 to 61 B 24 to each other and also close the gaps therebetween.
  • These bottom-side connection pieces 61 B 31 to 61 B 34 have the same shape and the same size as the top-side connection pieces 61 A 31 to 61 A 34 .
  • bending ruled lines are provided between the respective bottom-side side surfaces 61 B 21 to 61 B 24 and the respective bottom-side connection pieces 61 B 31 to 61 B 34 .
  • bottom-side double-folding ruled lines 61 B 31 c to 61 B 34 c that extend from the respective vertexes of the bottom surface 61 B 10 so as to bisect the bottom-side connection pieces 61 B 31 to 61 B 34 are provided on the respective bottom-side connection pieces 61 B 31 c to 61 B 34 c.
  • the bottom-side sheet 61 B has, at the outer side of a rectangular portion obtained by combining the bottom-side side surfaces 61 B 21 to 61 B 24 with the bottom-side connection pieces 61 B 31 to 61 B 34 , the bottom-side fixing portion 61 B 40 at which the bottom-side sheet 61 B is to be fixed to the top-side sheet 61 A.
  • the bottom-side fixing portion 61 B 40 is a heat-seal region over the entire periphery.
  • a contour line 61 By of the bottom-side fixing portion 61 B 40 forms the contour line of the bottom-side fixing portion 61 B 40 and also forms the edge (contour line) of the bottom-side sheet 61 B.
  • the outer shape of the bottom-side fixing portion 61 B 40 is substantially a rectangle.
  • the outer shape of the bottom-side sheet 61 B is formed so as to be smaller than the outer shape of the top-side sheet 61 A.
  • reference character 61 LA denotes the length in the horizontal direction of the top-side sheet 61 A
  • reference character 61 LB denotes the length in the horizontal direction of the bottom-side sheet 61 B.
  • the difference therebetween that is, the difference between the length 61 LA in the horizontal direction of the top-side sheet 61 A and the length 61 LB in the horizontal direction of the bottom-side sheet 61 B, is desirably not less than 0.6 mm.
  • both sheets 61 A and 61 B are arranged such that the edges thereof are displaced relative to each other by 0.3 mm or greater. Accordingly, even when a slight positional displacement occurs between both sheets 61 A and 61 B, the edge 61 By of the bottom-side sheet 61 B is covered with the top-side sheet 61 A and thus does not become exposed.
  • the difference between the length 61 LA in the horizontal direction of the top-side sheet 61 A and the length 61 LB in the horizontal direction of the bottom-side sheet 61 B is desirably not less than 1.0 mm.
  • reference character 61 HA denotes the length in the vertical direction of the top-side sheet 61 A
  • reference character 61 HB denotes the length in the vertical direction of the bottom-side sheet 61 B.
  • the difference therebetween that is, the difference between the length 61 HA in the vertical direction of the top-side sheet 61 A and the length 61 HB in the vertical direction of the bottom-side sheet 61 B, is also desirably not less than 0.6 mm. This difference is also desirably not less than 1.0 mm.
  • the length of the top-side sheet 61 A is longer than the length of the bottom-side sheet 61 B in both the vertical direction and the horizontal direction, the length of the top-side sheet 61 A is longer than the length of the bottom-side sheet 61 B in any direction.
  • the edge 61 BY of the bottom-side sheet 61 B does not become exposed at any position on the entire periphery.
  • a bending ruled line 61 Bx is provided at the boundaries between the bottom-side fixing portion 61 B 40 and the bottom-side side surfaces 61 B 21 to 61 B 24 of the bottom-side sheet 61 B and the boundaries between the bottom-side fixing portion 61 B 40 and the bottom-side connection pieces 61 B 31 to 61 B 34 .
  • both fixing portions 61 A 40 and 61 B 40 fixed to each other are bent toward the bottom-side sheet 61 B side due to the bending ruled line 61 Bx, and the outer side thereof is covered with the top-side sheet 61 A.
  • the edge 61 By of the bottom-side sheet 61 B is not exposed on the outer surface of the packaging container 61 .
  • the packaging container 61 can be produced as described below.
  • the packaging container 61 in the flat state can be produced by aligning and overlaying the top-side sheet 61 A and the bottom-side sheet 61 B on each other and heat-sealing both fixing portions 61 A 40 and 61 B 40 to each other (see FIG. 42 ). Since the width of the bottom-side fixing portion 61 B 40 is smaller than that of the top-side fixing portion 61 A 40 , the fixing portions 61 A 40 and 61 B 40 does not need to be heat-sealed over the entire width, but are desirably heat-sealed such that the fixing portions 61 A 40 and 61 B 40 are fixed to each other over the entire periphery.
  • a portion formed by heat-sealing both fixing portions 61 A 40 and 61 B 40 to each other is referred to as a container fixed portion 6140 .
  • top-side side surfaces 61 A 21 to 61 A 24 also have the same shape and the same size as the bottom-side side surfaces 61 B 21 to 61 B 24 , when the top-side sheet 61 A and the bottom-side sheet 61 B are aligned with and overlaid on each other, these surfaces are exactly overlaid on each other.
  • top-side connection pieces 61 A 31 to 61 A 34 and the bottom-side connection pieces 61 B 31 to 61 B 34 have the same shape and the same size, these pieces are exactly placed on each other.
  • the top-side double-folding ruled lines 61 A 31 c to 61 A 34 c which are provided on the top-side connection pieces 61 A 31 to 61 A 34 , are exactly laid on the bottom-side double-folding ruled lines 61 B 31 c to 61 B 34 c , which are provided on the bottom-side connection pieces 61 B 31 to 61 B 34 , and the boundary 61 Ax of the top-side fixing portion 61 A 40 in the top-side sheet 61 A and the boundary 61 Bx of the bottom-side fixing portion 61 B 40 in the bottom-side sheet 61 B are also exactly placed on each other.
  • edge (contour line) 61 Ay of the top-side sheet 61 A is formed so as to be larger than the edge (contour line) 61 By of the bottom-side sheet 61 B, the positions of both edges 61 Ay and 61 By do not coincide with each other, and the edge 61 Ay of the top-side sheet 61 A is located outside the edge 61 By of the bottom-side sheet 61 B.
  • the distance 6 d L in the horizontal direction between the edge 61 Ay of the top-side sheet 61 A and the edge 61 By of the bottom-side sheet 61 B is not less than 0.3 mm.
  • the distance 6 d H in the vertical direction between the edge 61 Ay of the top-side sheet 61 A and the edge 61 By of the bottom-side sheet 61 B is also not less than 0.3 mm, and the edge 61 Ay of the top-side sheet 61 A and the edge 61 By of the bottom-side sheet 61 B are formed so as to be displaced relative to each other by 0.3 mm or greater over the entire periphery.
  • top-side sheet 61 A and the bottom-side sheet 61 B cannot be accurately aligned with each other and a displacement occurs therebetween, a displacement also occurs between the positions of the top surface 61 A 10 and the bottom surface 61 B 10 with this displacement, and displacements also occur between the top-side side surfaces 61 A 21 to 61 A 24 and the bottom-side side surfaces 61 B 21 to 61 B 24 , between the top-side connection pieces 61 A 31 to 61 A 34 and the bottom-side connection pieces 61 B 31 to 61 B 34 , between the top-side double-folding ruled lines 61 A 31 c to 61 A 34 c and the bottom-side double-folding ruled lines 61 B 31 c to 61 B 34 c , and between the boundary 61 Ax of the top-side fixing portion 61 A 40 and the boundary 61 Bx of the bottom-side fixing portion 61 B 40 , respectively.
  • the distance between the edge 61 Ay of the top-side sheet 61 A and the edge 61 By of the bottom-side sheet 61 B becomes larger or smaller than a design value in accordance with the direction of the displacement.
  • the displacement between the top-side sheet 61 A and the bottom-side sheet 61 B is a slight displacement and the magnitude of the displacement is within 0.3 mm, the edge 61 By of the bottom-side sheet 61 B does not protrude outside the edge 61 Ay of the top-side sheet 61 A.
  • a positional displacement between the top surface 61 A 10 and the bottom surface 61 B 10 or a positional displacement between the top-side side surfaces 61 A 21 to 61 A 24 and the bottom-side side surfaces 61 B 21 to 61 B 24 is also within 0.3 mm, such a positional displacement does not become an obstacle to transformation of the packaging container 61 into the box state.
  • the above distance is desirably not less than 0.5 mm.
  • FIG. 43 shows the packaging container 61 in a state where the packaging container 61 is transformed into the box state and the respective connection pieces 61 A 31 to 61 A 34 and 61 B 31 to 61 B 34 are bent onto the outer surface.
  • the top-side connection pieces 61 A 31 to 61 A 34 and the bottom-side connection pieces 61 B 31 to 61 B 34 may be folded double such that a mountain fold is made with respect to the container outer surface at each of the top-side double-folding ruled lines 61 A 31 c to 61 A 34 c and the bottom-side double-folding ruled lines 61 B 31 c to 61 B 34 c , which are located at the centers of the top-side connection pieces 61 A 31 to 61 A 34 and the bottom-side connection pieces 61 B 31 to 61 B 34 .
  • the sides forming the side surfaces adjacent to each other, among the top-side side surfaces 61 A 21 to 61 A 24 of the top-side sheet 61 A, are placed on each other.
  • Describing the top-side connection piece 61 A 33 with reference to the enlarged view of FIG. 40 by folding double the top-side connection piece 61 A 33 at the top-side double-folding ruled line 61 A 33 c , the side 61 A 23 b of the top-side side surface 61 A 23 and the side 61 A 24 b of the top-side side surface 61 A 24 , which are located at both sides of the top-side connection piece 61 A 33 , are placed on each other.
  • the top-side connection piece 61 A 33 of the top-side sheet 61 A and the bottom-side connection piece 61 B 33 of the bottom-side sheet 61 B are exactly placed on each other, and the top-side double-folding ruled line 61 A 33 c and the bottom-side double-folding ruled line 61 B 33 c thereof are also exactly placed on each other, and, even if a positional displacement is present, the positional displacement is a slight positional displacement.
  • the bottom-side connection piece 61 B 33 of the bottom-side sheet 61 B is also folded double at the bottom-side double-folding ruled line 61 B 33 c . Therefore, the side 61 B 23 b of the bottom-side side surface 61 B 23 and the side 61 B 24 b of the bottom-side side surface 61 B 24 , which are located at both sides of the bottom-side connection piece 61 B 33 , are also placed on each other.
  • a side surface 6123 of the packaging container 61 in the box state is formed by both side surfaces 61 A 23 and 61 B 23 .
  • top-side connection piece 61 A 33 of the top-side sheet 61 A and the bottom-side connection piece 61 B 33 of the bottom-side sheet 61 B are also contiguous to each other via the container fixed portion 6140 , when a portion composed of both connection pieces 61 A 33 and 61 B 33 is referred to as a container connection piece 6133 , the above side surfaces are connected to each other and also closed by the container connection piece 6133 .
  • the side surface 6123 composed of the top-side side surface 61 A 23 and the bottom-side side surface 61 B 23 and a side surface 6124 composed of the top-side side surface 61 A 24 and the bottom-side side surface 61 B 24 are connected to each other and further closed by the container connection piece 6133 without any gap being formed therebetween.
  • a side surface 6121 composed of the top-side side surface 61 A 21 and the bottom-side side surface 61 B 21 and a side surface 6122 composed of the top-side side surface 61 A 22 and the bottom-side side surface 61 B 22 are formed by folding double a container connection piece 6131 , composed of the top-side connection piece 61 A 31 and the bottom-side connection piece 61 B 31 , such that a mountain fold is made with respect to the container outer surface at each of the top-side double-folding ruled line 61 A 31 c and the bottom-side double-folding ruled line 61 B 31 c , which are located at the centers of the top-side connection piece 61 A 31 and the bottom-side connection piece 61 B 31 , and the side surface 6121 and the side surface 6122 are connected to each other
  • the side surface 6123 composed of the top-side side surface 61 A 22 and the bottom-side side surface 61 B 22 and a side surface 6123 composed of the top-side side surface 61 A 23 and the bottom-side side surface 61 B 23 are formed by folding double a container connection piece 6132 , composed of the top-side connection piece 61 A 32 and the bottom-side connection piece 61 B 32 , such that a mountain fold is made with respect to the container outer surface at each of the top-side double-folding ruled line 61 A 32 c and the bottom-side double-folding ruled line 61 B 32 c , which are located at the centers of the top-side connection piece 61 A 32 and the bottom-side connection piece 61 B 32 , and the side surface 6122 and the side surface 6122 are connected to each other and closed by the container connection piece 6132 .
  • a side surface 6124 composed of the top-side side surface 61 A 24 and the bottom-side side surface 61 B 24 and the side surface 6121 composed of the top-side side surface 61 A 21 and the bottom-side side surface 61 B 21 are formed by folding double a connection piece 6134 , composed of the top-side connection piece 61 A 34 and the bottom-side connection piece 61 B 34 , such that a mountain fold is made with respect to the container outer surface at each of the top-side double-folding ruled line 61 A 34 c and the bottom-side double-folding ruled line 61 B 34 c , which are located at the centers of the e top-side connection piece 61 A 34 and the bottom-side connection piece 61 B 34 , and the side surface 6124 and the side surface 6121 are connected to each other and closed by the container connection piece 6134 .
  • the packaging container 61 in the box state has the top surface 61 A 10 and the bottom surface 61 B 10 , the side surfaces 6121 to 6124 are provided at the peripheries thereof, and the gaps between the side surfaces 6121 to 6124 are closed by the container connection pieces 6131 to 6134 .
  • the packaging container 61 is in a hermetically sealed state except for the opening 61 A 11 .
  • the bending ruled line is provided at the boundary 61 Bx of the bottom-side fixing portion 61 B 40 of the bottom-side sheet 61 B, and no bending ruled line is provided at the boundary 61 Ax of the top-side fixing portion 61 A 40 of the top-side sheet 61 A.
  • the container fixed portion 6140 which is formed by heat-sealing both fixing portions 61 A 40 and 61 B 40 , is bent toward the bottom-side sheet 61 B.
  • the bottom-side fixing portion 61 B 40 is bent toward the bottom-side sheet 61 B at the bending ruled line provided at the boundary 61 Bx, and the top-side fixing portion 61 A 40 of the top-side sheet 61 A is overlaid on the outer surface side of the bottom-side fixing portion 61 B 40 of the bottom-side sheet 61 B without being bent at the boundary 61 Ax. Therefore, the edge 61 By of the bottom-side sheet 61 B is covered with the top-side fixing portion 61 A 40 of the top-side sheet 61 A and is not exposed on the outer surface.
  • connection pieces 6131 to 6134 are desirably folded double while air or the like is blown in through the opening 61 A 11 .
  • connection pieces 6131 to 6134 protrude on the outer surface of the packaging container 1 . Therefore, the appearance of the packaging container 61 is desirably made neat by bending and overlaying the connection pieces 6131 to 6134 onto the respective side surfaces 6121 to 6124 of the packaging container 61 .
  • FIG. 43 shows the packaging container 61 in a state where the connection pieces 6131 to 6134 are bent and overlaid on the respective side surfaces 6121 to 6124 of the packaging container 1 as described above.
  • the connection pieces 6131 to 6134 can be detachably fixed to the respective side surfaces 6121 to 6124 by means of an adhesive, an adhesive tape, or a joining member such as a hook and loop fastener and a snap button.
  • the container fixed portion 6140 may be held and pulled outward of the packaging container 61 .
  • the double-folded connection pieces 6131 to 6134 are unfolded, and the packaging container 61 is transformed into the flat state.
  • the packaging container 61 can be used as described below.
  • the packaging container 61 is produced in the flat state, stored in this state, and transferred to a contents filling step. Then, in the contents filling step, the packaging container 61 is transformed into the box state, then contents are filled thereinto through the opening 61 A 11 , and the opening 61 A 11 is closed, whereby a package containing the contents can be prepared.
  • the package in the box state containing the contents as described above can be returned to the flat state again after the contents are discharged. It is possible to repeatedly transform the package between the box state and the flat state as described above.
  • top-side sheet 61 A or the bottom-side sheet 61 B for example, a laminated film having a thermoplastic resin layer or a sealant layer layered on a base material layer made of paper can be suitably used.
  • a barrier layer, a functional film, or the like may be added as appropriate according to a required function.
  • the end surface of the end portion of the top-side sheet 61 A or the bottom-side sheet 61 B may be protected by a known method.
  • both the top-side sheet 61 A and the bottom-side sheet 61 B are formed by one sheet, and the top-side sheet 61 A and the bottom-side sheet 61 B are partitioned by the bending ruled line 61 AB, and the others are the same as the first example.
  • the top-side fixing portion of the top-side sheet 61 A is composed of the bending ruled line 61 AB and a heat-seal region and configured to surround the entire periphery of the top-side sheet 61 A with a combination of the bending ruled line 61 AB and the heat-seal region.
  • the bottom-side fixing portion of the bottom-side sheet 61 B is composed of the bending ruled line 61 AB and a heat-seal region and configured to surround the entire periphery of the bottom-side sheet 61 B with a combination of the bending ruled line 61 AB and the heat-seal region.
  • a top surface 62 A 10 of a top-side sheet 62 A is formed in a regular hexagon shape
  • a bottom surface 62 B 10 of a bottom-side sheet 62 B is formed in a regular hexagon shape that is the same in shape and size as that of the top surface 62 A 10 .
  • each of the edge 62 Ay of the top-side sheet 62 A and the edge 62 By of the bottom-side sheet 62 B is circular, a length 62 LA in the horizontal direction of the top-side sheet 62 A is longer than a length 62 LB in the horizontal direction of the bottom-side sheet 62 B, and the difference therebetween is not less than 0.3 mm. Moreover, a length 62 HA in the vertical direction of the top-side sheet 62 A is also longer than a length 62 HB in the vertical direction of the bottom-side sheet 62 B, and the difference therebetween is also not less than 0.3 mm.
  • the length of the top-side sheet 62 A is longer than the length of the bottom-side sheet 62 B in any direction by 0.3 mm or greater. Therefore, when the packaging container 62 is in any of the box state and the flat state, the edge 62 By of the bottom-side sheet 62 B is covered with the top-side sheet 62 A and is not exposed.
  • the packaging container 62 can also be repeatedly transformed between the box state and the flat state by the same method as in the first modification.
  • a top surface 63 A 10 of a top-side sheet 63 A is formed in a regular triangle shape
  • a bottom surface 63 B 10 of a bottom-side sheet 63 B is formed in a regular triangle shape that is the same in shape and size as that of the top surface 63 A 10 .
  • each of the contour line 63 Ay of the top-side sheet 63 A and the edge 63 By of the bottom-side sheet 63 B is formed by connecting three circular arcs, a length 63 LA in the horizontal direction of the top-side sheet 63 A is longer than a length 63 LB in the horizontal direction of the bottom-side sheet 63 B, and the difference therebetween is not less than 0.3 mm. Therefore, the length of the top-side sheet 63 A is longer than the length of the bottom-side sheet 63 B in any direction by 0.3 mm or greater, and, when the packaging container 63 is in any of the box state and the flat state, the edge 63 By of the bottom-side sheet 63 B is covered with the top-side sheet 63 A and is not exposed.
  • the packaging container 63 can also be repeatedly transformed between the box state and the flat state by the same method as in the first modification and the second modification.
  • the top-side sheet 61 A and the bottom-side sheet 61 B which are substantially rectangular as shown in FIG. 40 and FIG. 41 , were used.
  • the length 61 LA in the horizontal direction of the top-side sheet 61 A is 180.0 mm
  • the length 61 HA in the vertical direction of the top-side sheet 61 A is 200.0 mm
  • the length 61 LB in the horizontal direction of the bottom-side sheet 61 B is 179.4 mm
  • the length 61 HB in the vertical direction of the bottom-side sheet 61 B is 199.4 mm.
  • the top-side sheet 61 A is longer than the bottom-side sheet 61 B by 0.6 mm in any of the vertical direction and the horizontal direction.
  • the distance between the edge 61 Ay of the top-side sheet 61 A and the edge 61 By of the bottom-side sheet 61 B is 0.3 mm.
  • top-side sheet 61 A and the bottom-side sheet 61 B described above were overlaid on each other, and the fixing portions 61 A 40 and 61 B 40 at the peripheries were heat-sealed to each other, thereby producing a packaging container 61 in a flat state.
  • a packaging container 61 in a box state is produced by folding double all the connection pieces 6131 to 6134 .
  • the connection pieces 6131 to 6134 are bent and overlaid onto the respective side surfaces 6121 to 6124 of the packaging container 61 .
  • a total of ten packaging containers 61 in a box state were produced in this manner.
  • the edge 61 By of the bottom-side sheet 61 B protruded from the edge 61 Ay of the top-side sheet 61 A and was exposed on the outer surface was counted, the edge 61 By of the bottom-side sheet 61 B protruded from the edge 61 Ay of the top-side sheet 61 A and was exposed on the outer surface in two packaging containers 61 out of these ten packaging containers 61 .
  • the edge 61 By was covered with the top-side sheet 61 A and was not exposed on the outer surface.
  • Packaging containers 61 in a box state were produced in the same manner as Example 6-1, except that the length 61 LB in the horizontal direction of the bottom-side sheet 61 B was 178.0 mm and the length 61 HB in the vertical direction of the bottom-side sheet 61 B was 198.0 mm.
  • the edge 61 By of the bottom-side sheet 61 B protruded from the edge 61 Ay of the top-side sheet 61 A and was exposed on the outer surface was counted, the edge 61 By was covered with the top-side sheet 61 A and was not exposed on the outer surface in all (ten) of these ten packaging containers 61 .
  • the distance between the edge 61 Ay of the top-side sheet 61 A and the edge 61 By of the bottom-side sheet 61 B is 0.5 mm.
  • Packaging containers 61 in a box state were produced in the same manner as Example 6-1, except that the length 61 LB in the horizontal direction of the bottom-side sheet 61 B was 174.0 mm and the length 61 HB in the vertical direction of the bottom-side sheet 61 B was 194.0 mm.
  • the edge 61 By of the bottom-side sheet 61 B protruded from the edge 61 Ay of the top-side sheet 61 A and was exposed on the outer surface was counted, the edge 61 By was covered with the top-side sheet 61 A and was not exposed on the outer surface in all (ten) of these ten packaging containers 61 .
  • the distance between the edge 61 Ay of the top-side sheet 61 A and the edge 61 By of the bottom-side sheet 61 B is 3.0 mm.
  • Packaging containers 61 in a box state were produced in the same manner as Example 6-1, except that the length 61 LB in the horizontal direction of the bottom-side sheet 61 B was 180.0 mm and the length 61 HB in the vertical direction of the bottom-side sheet 61 B was 200.0 mm.
  • the edge 61 By of the bottom-side sheet 61 B protruded from the edge 61 Ay of the top-side sheet 61 A and was exposed on the outer surface was counted, the edge 61 By of the bottom-side sheet 61 B protruded from the edge 61 Ay of the top-side sheet 61 A and was exposed on the outer surface in all (ten) of these ten packaging containers 61 .
  • the bottom-side sheet 61 B has the same shape and the same size as the top-side sheet 61 A.
  • the distance between the edge 61 Ay of the top-side sheet 61 A and the edge 61 By of the bottom-side sheet 61 B is 0.0 mm.
  • the distance between the edge 61 Ay of the top-side sheet 61 A and the edge 61 By of the bottom-side sheet 61 B is desirably not less than 0.5 mm. In this case (Examples 6-2 and 6-3), without exception, the edge 61 By of the bottom-side sheet 61 B does not become exposed on the outer surface.
  • one of the outer shape of the top-side sheet 61 A and the outer shape of the bottom-side sheet 61 B is larger than the other.
  • the edge of the sheet having a smaller outer shape can be covered with the sheet having a larger outer shape. Since the edge of the sheet having a smaller outer shape does not become exposed on the outer surface of the packaging container 61 as described above, the packaging container 61 can have a neat appearance.
  • the packaging container 61 can be transformed between the box state and the flat state, and when the packaging container 61 is in any of these states, the edge of the sheet having a smaller outer shape is not exposed on the packaging container outer surface.
  • a packaging container 71 according to a seventh embodiment of the present invention in which the peeling strength of a container fixed portion is specified within a predetermined range will be described with the packaging container 61 as an example.
  • a heat-seal region formed by heat-sealing the fixing portion 61 A 40 of the top-side sheet 61 A and the fixing portion 61 B 40 of the bottom-side sheet 61 B (corresponding to the side seal portions of the packaging containers 1100 and 2100 ), that is, the container fixed portion 6140 has a peeling strength not less than 9 N.
  • the peeling strength is not less than 9 N, even if the packaging container 71 is transformed from a flat state into a box state while a fluid such as air is blown thereinto as described later, no pinhole occurs in the container fixed portion 6140 .
  • the peeling strength is less than 9 N, if the packaging container 71 is transformed from the flat state into the box state while the fluid such as air is blown thereinto, a pinhole may occur in the packaging container 71 .
  • the peeling strength of the heat-seal region is desirably not less than 20 N.
  • the peeling strength is not less than 20 N, no pinhole occurs in the packaging container 71 even if the packaging container 71 is returned to the flat state and then transformed into the box state again while the fluid such as air is blown thereinto after the packaging container 71 is transformed from the flat state into the box state while the fluid such as air is blown thereinto.
  • the packaging container 71 when transforming the packaging container 71 from the flat state into the box state by folding double the connection pieces 6131 to 6134 , the internal volume of the packaging container 71 rapidly increases, and thus the double folding is desirably carried out while a fluid such as air is pressurized and blown in through the opening 61 A 11 .
  • a fluid such as air
  • an optional gas may be used.
  • the packaging container 71 can be transformed into the box state by folding double the connection pieces 6131 to 6134 while expanding the packaging container 71 by pressurizing the liquid contents and filling the liquid contents through the opening 11 into the packaging container 71 . Even if a gas or a liquid is pressurized and blown in as described above, when the peeling strength of the container fixed portion 6140 is not less than 9 N, no pinhole occurs in the packaging container 71 .
  • the peeling strength of the container fixed portion 6140 is desirably not less than 20 N.
  • the peeling strength is not less than 20 N, no pinhole occurs in the packaging container 71 even if the packaging container 71 is returned to the flat state and then transformed into the box state again while the fluid such as air is blown thereinto after the packaging container 71 is transformed from the flat state into the box state while the fluid such as air is blown thereinto.
  • the container fixed portion 6140 is composed of the bending ruled line 61 AB and the heat-seal region formed by heat-sealing the top-side sheet 61 A and the bottom-side sheet 61 B. Since no pinhole occurs at the position of the bending ruled line 61 AB, when the peeling strength of the heat-seal region of the container fixed portion 6140 excluding the bending ruled line 61 AB is not less than 9 N, no pinhole occurs in the packaging container 71 even if the packaging container 71 is transformed from the flat state into the box state while the fluid such as air is blown thereinto. In this case as well, the peeling strength is desirably not less than 20 N.
  • the top-side sheet 61 A and the bottom-side sheet 61 B which are substantially rectangular as shown in FIG. 40 and FIG. 41 , were used.
  • Each of the top-side sheet 61 A and the bottom-side sheet 61 B has a layer configuration including, from the packaging container outer surface side, a polyethylene resin layer (thickness 25 ⁇ m), paper (basis weight 250 g/mm 2 ), a polyethylene resin layer (thickness 25 ⁇ m), aluminum foil (thickness 6 ⁇ m), a polyester film (thickness 12 ⁇ m), and a polyethylene resin layer (thickness 40 ⁇ m).
  • a polyethylene resin layer thickness 25 ⁇ m
  • paper basis weight 250 g/mm 2
  • a polyethylene resin layer thickness 25 ⁇ m
  • aluminum foil thickness 6 ⁇ m
  • a polyester film thickness 12 ⁇ m
  • a polyethylene resin layer thickness 40 ⁇ m
  • the top-side sheet 61 A has, at two locations on the edge 61 Ay thereof, alignment marks 61 Ay 1 and 61 Ay 2 formed by recesses that are recessed inward
  • the bottom-side sheet 61 B also has, at the positions, on the edge 61 By, corresponding to the alignment marks 61 Ay 1 and 61 Ay 2 , two alignment marks 61 By 1 and 61 By 2 formed by recesses that are recessed inward.
  • the length 61 LA in the horizontal direction of the top-side sheet 61 A is 180.0 mm, and the length 61 HA in the vertical direction of the top-side sheet 61 A is 200.0 mm.
  • the length 61 LB in the horizontal direction of the bottom-side sheet 61 B is 177.0 mm, and the length 61 HB in the vertical direction of the bottom-side sheet 61 B is 197.0 mm.
  • the top-side sheet 61 A is longer than the bottom-side sheet 61 B by 3.0 mm in any of the vertical direction and the horizontal direction.
  • the distance between the edge 61 Ay of the top-side sheet 61 A and the edge 61 By of the bottom-side sheet 61 B is 1.5 mm.
  • the top-side sheet 61 A and the bottom-side sheet 61 B described above were overlaid and aligned with each other using the alignment marks 61 Ay 1 , 61 Ay 2 , 61 By 1 , and 61 By 2 , and then the fixing portions 61 A 40 and 61 B 40 at the peripheries were heat-sealed to each other, thereby producing a packaging container 71 in a flat state.
  • the peeling strength of the container fixed portion 6140 formed by heat-sealing was measured at five points on each side of the packaging container 71 (20 points on the packaging container 71 ), the average was 30 N.
  • the peeling strength was measured according to “Heat seal strength test for bags” in JIS Z0238 “Testing methods for heat sealed flexible packages”.
  • a packaging container 71 in a box state is produced by folding double all the connection pieces 6131 to 6134 while pressurizing air and blowing the air thereinto. Finally, the connection pieces 6131 to 6134 are bent and overlaid onto the respective side surfaces 6121 to 6124 of the packaging container 71 .
  • a total of ten packaging containers 71 in a box state were produced in this manner, and the number of packaging containers 71 in which any pinhole had occurred in the container fixed portion 6140 formed by heat-sealing was counted.
  • the results are shown in Table 2 as the number of packaging containers 71 in which any pinhole had occurred in the box state for the first time.
  • Packaging containers 71 in a box state were produced in the same manner as Example 7-1, except that the peeling strength of the container fixed portion 6140 formed by heat-sealing was 20 N as an average, and the number (for the first time) of packaging containers 71 in which any pinhole had occurred in the container fixed portion 6140 was counted. In addition, after returning each packaging container 71 to the flat state, the packaging container 71 was brought into the box state again, and the number (for the second time) of packaging containers 71 in which any pinhole had occurred in the container fixed portion 6140 was counted. The results are shown in Table 2.
  • Packaging containers 71 in a box state were produced in the same manner as Example 7-1, except that the peeling strength of the container fixed portion 6140 formed by heat-sealing was 15 N as an average, and the number (for the first time) of packaging containers 71 in which any pinhole had occurred in the container fixed portion 6140 was counted. In addition, after returning each packaging container 71 to the flat state, the packaging container 71 was brought into the box state again, and the number (for the second time) of packaging containers 71 in which any pinhole had occurred in the container fixed portion 6140 was counted. The results are shown in Table 2.
  • Packaging containers 71 in a box state were produced in the same manner as Example 7-1, except that the peeling strength of the container fixed portion 6140 formed by heat-sealing was 10 N as an average, and the number (for the first time) of packaging containers 71 in which any pinhole had occurred in the container fixed portion 6140 was counted. In addition, after returning each packaging container 71 to the flat state, the packaging container 71 was brought into the box state again, and the number (for the second time) of packaging containers 71 in which any pinhole had occurred in the container fixed portion 6140 was counted. The results are shown in Table 2.
  • Packaging containers 71 in a box state were produced in the same manner as Example 7-1, except that the peeling strength of the container fixed portion 6140 formed by heat-sealing was 9 N as an average, and the number (for the first time) of packaging containers 71 in which any pinhole had occurred in the container fixed portion 6140 was counted. In addition, after returning each packaging container 71 to the flat state, the packaging container 71 was brought into the box state again, and the number (for the second time) of packaging containers 71 in which any pinhole had occurred in the container fixed portion 6140 was counted. The results are shown in Table 2.
  • Packaging containers 61 in a box state were produced in the same manner as Example 7-1, except that the peeling strength of the container fixed portion 6140 formed by heat-sealing was 8 N as an average, and the number (for the first time) of packaging containers 61 in which any pinhole had occurred in the container fixed portion 6140 was counted.
  • the packaging container 71 was brought into the box state again, and the number (for the second time) of packaging containers 71 in which any pinhole had occurred in the container fixed portion 6140 was counted. The results are shown in Table 2.
  • a laminated sheet having a layer configuration including, from the packaging container outer surface side, a polyethylene resin layer (thickness 25 ⁇ m), paper (basis weight 250 g/mm 2 ), and a polyethylene resin layer (thickness 40 ⁇ m) was used as each of the top-side sheet 61 A and the bottom-side sheet 61 B. Then, packaging containers 71 in a box state were produced in the same manner as Example 7-1, except that the peeling strength of the container fixed portion 6140 formed by heat-sealing was 8 N as an average, and the number (for the first time) of packaging containers 71 in which any pinhole had occurred in the container fixed portion 6140 was counted.
  • Example 7-1 0/10 0/10
  • Example 7-2 0/10 0/10
  • Example 7-3 0/10 1/10
  • Example 7-4 0/10 3/10
  • Example 7-5 0/10 4/10
  • Example 7-6 3/10 8/10
  • Example 7-6 and Example 7-7 are compared to each other, it can be understood that the results do not depend on the materials of the top-side sheet 61 A and the bottom-side sheet 61 B.
  • the method for transforming the packaging container of the present invention is not limited, but the packaging container can be transformed by blowing the fluid such as air into the packaging container to expand the packaging container.
  • the peeling strength of the heat-seal region formed by heat-sealing the top-side sheet 61 A and the bottom-side sheet 61 B is not less than 9 N (Examples 7-1 to 7-5)
  • no pinhole occurs in the packaging container even if the packaging container is transformed from the flat state into the box state while the fluid such as air is blown thereinto.
  • FIG. 51 is a perspective view of the spout 61 C.
  • the top-side sheet 61 A can be formed from an optional material
  • the top-side sheet 61 A desirably has a heat-sealable resin layer at a surface (interior surface) thereof that is to be at the inner surface side of the packaging container 61 .
  • the heat-sealable resin layer at the interior surface performs two functions. Specifically, first, the heat-sealable resin layer serves to be welded with a later-described flange portion 61 C 2 of the spout 61 C to fix the flange portion 61 C 2 .
  • the heat-sealable resin layer serves to heat-seal the top-side fixing portion 61 A 40 of the top-side sheet 61 A and the bottom-side fixing portion 61 B 40 of the bottom-side sheet 61 B to each other to form the fixed portion 6140 of the packaging container 61 .
  • the heat-sealable resin polyolefin resins such as a polyethylene resin and a polypropylene resin can be adopted.
  • the top-side sheet 61 A a laminated film having a thermoplastic resin layer or a heat-sealable resin layer layered on a base material layer made of paper can be suitably used.
  • a barrier layer, a functional film, or the like may be added as appropriate according to a required function.
  • the top-side sheet 61 A is, for example, a sheet in which a polyethylene resin layer is layered on the outer surface side of paper, a polyethylene resin layer, aluminum foil, a polyester resin film, and a polyethylene resin layer are sequentially layered on the inner surface side of the paper, and the interior surface is formed by the polyethylene resin layer.
  • the end surface of the end portion of the top-side sheet 61 A may be protected by a known method.
  • the bottom-side sheet 61 B can also be formed from an optional material
  • the bottom-side sheet 61 B desirably has a heat-sealable resin layer at a surface (interior surface) thereof that is to be at the inner surface side of the packaging container 61 .
  • the heat-sealable resin layer at the interior surface has a roll in heat-sealing the top-side fixing portion 61 A 40 of the top-side sheet 61 A and the bottom-side fixing portion 61 B 40 of the bottom-side sheet 61 B to each other to form the fixed portion 6140 of the packaging container 61 .
  • the bottom-side sheet 61 B similar to the top-side sheet 61 A, a laminated film having a thermoplastic resin layer or a heat-sealable resin layer layered on a base material layer made of paper can be suitably used.
  • a barrier layer, a functional film, or the like may be added as appropriate according to a required function.
  • the end surface of the end portion of the bottom-side sheet 61 B may also be protected by a known method.
  • the spout 61 C is configured to include a tubular trunk portion 61 C 1 and the flange portion 61 C 2 .
  • the tubular trunk portion 61 C 1 is inserted into the opening 61 A 11 of the top-side sheet 61 A, and a flow passage is provided at the center thereof so as to penetrate in the up-down direction. Contents can be filled through the flow passage into the packaging container 61 , or contents within the packaging container 61 can be discharged through the flow passage.
  • the flange portion 61 C 2 projects outward from an end portion of the tubular trunk portion 61 C 1 , and the spout 61 C can be fixed to the top-side sheet 61 A by welding the flange portion 61 C 2 to the periphery of the opening 61 A 11 of the top-side sheet 61 A.
  • This production method includes a spout-equipped top-side sheet production step, and a fixing step.
  • the spout-equipped top-side sheet production step is a step of producing a spout-equipped top-side sheet by mounting the spout 61 C to the opening 61 A 11 of the top-side sheet 61 A.
  • the spout 61 C may be mounted thereto.
  • a spout-equipped top-side sheet can also be produced by the following method.
  • a spout-equipped top-side sheet can be produced by providing the opening 61 A 11 at a predetermined position in a sheet paper-like or rolled sheet for forming the top-side sheet 61 A, mounting the spout 61 C to the opening 61 A 11 , and then stamping the sheet.
  • each bending ruled line can be formed in an optional step.
  • each bending ruled line can be formed simultaneously when the opening 61 A 11 is provided in the sheet paper-like or rolled sheet, or each bending ruled line can be formed after the spout 61 C is mounted, and then the sheet can be stamped to produce the top-side sheet 61 A equipped with the spout 61 C.
  • each bending ruled line may be formed simultaneously when the sheet is stamped to produce the top-side sheet 61 A equipped with the spout 61 C. Still alternatively, each bending ruled line may be formed between the step of mounting the spout 61 C and the step of stamping the sheet, or each bending ruled line may be formed after the sheet is stamped.
  • this step can be carried out by inserting the tubular trunk portion 61 C 1 of the spout 61 C from the surface (interior surface) side that is to be the inner surface side of the packaging container 61 , of both surfaces of the top-side sheet 61 A, as shown in FIG. 52 , and welding the flange portion 61 C 2 to the opening 61 A 11 .
  • the top-side sheet 61 A and the tubular trunk portion 61 C 1 can be welded to each other by hot-pressing either one of or both the top-side sheet 61 A and the tubular trunk portion 61 C 1 , or can be ultrasonically welded to each other.
  • the fixing step is a step of fixing the top-side fixing portion 61 A 40 of the top-side sheet 61 A and the bottom-side fixing portion 61 B 40 of the bottom-side sheet 61 B to each other.
  • This step needs to be carried out after the spout-equipped top-side sheet production step. That is, the top-side sheet 61 A to be used in this step is equipped with the spout 61 C.
  • the fixing step can be carried out by aligning and overlaying the top-side sheet 61 A and the bottom-side sheet 61 B on each other as shown in FIG. 53 and heat-sealing both fixing portions 61 A 40 and 61 B 40 to each other.
  • the top-side sheet 61 A and the bottom-side sheet 61 B can be welded to each other by hot-pressing either one of or both the top-side sheet 61 A and the bottom-side sheet 61 B, or can be heat-sealed by ultrasonic irradiation.
  • Both fixing portions 61 A 40 and 61 B 40 do not need to be heat-sealed over the entire width thereof, but need to be heat-sealed such that both sheets 61 A and 61 B can be fixed to each other over the entire periphery.
  • the peeling strength of the fixing portions 61 A 40 and 61 B 40 is desirably not less than 9N.
  • a plan view of the packaging container 61 is the same as a plan view ( FIG. 40 ) of the top-side sheet 61 A.
  • the spout 61 C is mounted to the opening 61 A 11 of the top-side sheet 61 A, the top-side sheet 61 A and the bottom-side sheet 61 B are fixed to each other.
  • the formed packaging container 61 can be transformed between the box state and the flat state, and it is possible to produce the packaging container 61 equipped with the spout 61 C.
  • the present invention can be suitably used for a packaging container to be filled with a liquid.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cartons (AREA)
US16/413,096 2018-05-18 2019-08-02 Packaging container, filling method of contents for packaging container, and manufacturing method for packaging container Abandoned US20200062440A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US18/073,499 US20230107089A1 (en) 2018-05-18 2022-12-01 Packaging container, filling method of contents for packaging container, and manufacturing method for packaging container

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JPJP2018-096290 2018-05-18
JP2018096290A JP7139685B2 (ja) 2018-05-18 2018-05-18 包装容器
JP2018119838A JP7139714B2 (ja) 2018-06-25 2018-06-25 包装容器
JPJP2018-119838 2018-06-25
JP2018119836A JP7139713B2 (ja) 2018-06-25 2018-06-25 包装容器
JPJP2018-119836 2018-06-25
JPJP2018-153129 2018-08-16
JP2018153129A JP7135572B2 (ja) 2018-08-16 2018-08-16 包装容器の製造方法

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US20200062440A1 true US20200062440A1 (en) 2020-02-27

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US16/413,096 Abandoned US20200062440A1 (en) 2018-05-18 2019-08-02 Packaging container, filling method of contents for packaging container, and manufacturing method for packaging container
US18/073,499 Pending US20230107089A1 (en) 2018-05-18 2022-12-01 Packaging container, filling method of contents for packaging container, and manufacturing method for packaging container

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US (2) US20200062440A1 (fr)
EP (1) EP3795486A4 (fr)
CN (1) CN112105564B (fr)
WO (1) WO2019221289A1 (fr)

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KR20220160744A (ko) * 2021-05-28 2022-12-06 이요셉 재활용 골판지

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CN112105564A (zh) 2020-12-18
CN112105564B (zh) 2023-07-28
EP3795486A4 (fr) 2022-01-19
EP3795486A1 (fr) 2021-03-24
WO2019221289A1 (fr) 2019-11-21
US20230107089A1 (en) 2023-04-06

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