AU2019259357A1 - Paper container with stopper - Google Patents

Abstract

The present invention is a paper container with a stopper that allows a liquid substance to be smoothly extracted from a container body while reducing the amount of the liquid substance left in the container body. The paper container comprises: a container body 9 configured with a square columnar body section 6, a bottom section 7, and a flat top section 8; and a stopper 10 disposed on the top section 8. The stopper 10 is disposed at a position close to a first top corner part 11(A) of the top section 8. The body section 6 has, at a first body corner part 12(A), a first recessed part 16 formed by being enclosed by two recess-forming crease parts 14, 15 which extend toward the bottom section 7 while diverging from a start point S and converging at an end point E located at some position before reaching a first bottom corner part 13(A), said start point S being the first top corner part 11(A) or a position slightly separated from the first top corner part 11(A).

Description

Description

Title of Invention: PAPER CONTAINER WITH STOPPER

Technical Field

[0001] The present invention relates to apaper container with

a stopper having a flat top-type top. The paper container is

configured to contain a liquid matter such as a liquid detergent

or a liquid beverage, for example, milk or juice, contain a viscous

matter such as jelly or cream, or to contain a liquid matter such

as a liquid beverage in which solid food, for example, pieces of

a fruit are mixed.

Background Art

[0002] Hitherto, as a container configured to contain a liquid

matter such as a liquid detergent or a liquid beverage, for example,

milk or juice, contain a viscous matter such as jelly or cream,

or to contain a liquid matter such as a liquid beverage in which

solidfood, forexample, piecesofafruitaremixed, apapercontainer

with a stopper has been widely used. The paper container with a

stopper includes: a container main body including a tubular body

having a square tubular shape and upper and lower openings, a flat

top configured to seal the upper opening of the tubular body, and

a bottom configured to seal the lower opening of the tubular body;

and a stopper provided on top thereof.

[0003] In recent years, various improvements have been made to the above-mentioned container with a stopper having a so-called flat top-type top having a flat upper surface. For example, there has been known a paper container for liquid in which a screw-type discharge stopper including a stopper main body and a cap is mounted in a vicinity of a position at which an elevation angle, which is formed by a flat upper surface of a top and an imaginary straight line connecting a distal end of the stopper main body and a nearest short side of the flat upper surface to each other, is larger than a discharge angle of the stopper main body through which the liquid matter is discharged while the paper container for liquid is tilted.

With this configuration, at the time of discharge of the liquid

matter, the liquid matter is prevented from coming into contact

withafrontendportionoftheuppersurface andcausing, forexample,

dripping (see, for example, Patent Literature 1).

[0004] Further, as a container allowing the liquid matter to

be easily discharged through the stopper, as illustrated in FIG.

, there has been known a paper container 70 with a stopper. The

paper container 70 with a stopper includes a body 71 including four

side panels, a bottom 72, and an inclined flat top 73. The top 73

includes a square inclined surface having a pair of parallel sides

74 and 75, which extend horizontally and are different from each

other in level, and a pair of parallel sides 76 and 77, which extend

obliquely. Astopper 78 is provided on the top 73 (see, for example,

Patent Literature 2).

Citation List

Patent Literature

[00051 [PTL 1] JP 2007-076674 A

[PTL 2] JP 2005-35580 A

Summary of Invention

Technical Problem

[00061 According to the paper container with a stopper in which

the flat top-type top is provided on an upper portion of the tubular

body having a square tubular shape, which is exemplified by the

paper container for liquid described in Patent Literature 1, when

the liquid matter contained in the paper container is discharged,

in general, the liquid matter is discharged through the stopper

while the container main body is tilted.

At this time, regarding flow velocity of the liquid matter

flowing in the container main body toward the stopper, the body

of the container main body has a square tubular shape, and hence

large resistance is given to the flow of the liquid matter adjacent

to a body corner portion that is arranged on a lower side of the

tilted container main body and has a substantially right angle.

Accordingly, flow velocity of an upper part of the liquid matter

is high, and flow velocity of a lower part thereof is low.

[0007] Thus, smoothness of discharge of the liquid matter is

insufficient. When the liquidmatterincludes asolidmatterhaving

a large specific gravity, for example, when the liquid matter is corn soup with kernels or orange juice with pulp, the solid matter sinks down and accumulates in the body corner portion. This causes a problem in that it is difficult to discharge the solid matter, with the result that the solid matter is left in the container main body.

Further, when the liquid matter is the viscous matter such

as jelly or cream, the viscous matter sticks to an inner surface

ofthebody. Thiscausesaprobleminthatitisdifficulttodischarge

the viscous matter, with the result that the viscous matter is left

in the container main body.

[00081 Further, according to the paper container 70 with a

stopper illustrated in FIG. 20 and described in Patent Literature

2, the stopper 78 is mounted to the top 73 including the square

inclined surface having the pair of parallel sides 74 and 75, which

extend horizontally and are different from each other in level,

and the pair of parallel sides 76 and 77, which extend obliquely.

With this configuration, under a state in which the paper container

with a stopper is arranged upright, an air pocket 79 formed of

an inclined space is defined in the inclined top 73 (see FIG. 21).

From this state, when the liquid matter is discharged under a state

in which the paper container 70 with a stopper is tilted so that

the lower side 74 of the inclined top 73 is directed downward (see

FIG. 22), the air pocket 79 overlaps an upper portion of the opening

of the stopper 78 in an inner surface of the container main body

, and hence the opening of the stopper 78 is not blocked by the liquid matter. Thus, along with discharge of the liquid matter, the air flows into the container main body 80 through the upper portion of the opening of the stopper 78 without stagnating, thereby directly flowing into the air pocket 79. Therefore, pulsation of the liquid matter flowing through the stopper 78 is reduced, and the liquid matter is discharged easily.

[00091 Such effects are obtained with a configuration in which

there is an opposing distance between a liquid surface F of the

liquid matter and an inner surface of the top 73 in the air pocket

79. Whenalengthofthe opposingdistanceis small, thereisreduced

a tilting angle of the paper container 70 with a stopper enabling

drawing of the liquid matter under a state in which the air pocket

79 overlaps the opening of the stopper 78. Therefore, the liquid

matter canbe dischargedonlygradually, and the liquidmatter cannot

be discharged quickly. Further, there is reduced a range of the

tilting angle of the paper container 70 with a stopper enabling

discharge of the liquid matter under a state in which the air pocket

79 overlaps the opening of the stopper 78, and hence it is difficult

to adjust the tilting angle of the paper container 70 with a stopper.

Further, when the paper container 70 with a stopper is tilted by

a large angle mistakenly, the opening of the stopper 78 is blocked

by the liquidmatter, thereby causingpulsation ofthe liquidmatter.

Thus, it is difficult to discharge the liquid matter easily and

smoothly. Therefore, it is desired that an inclination angle of

the top 73 be an angle enabling defining the air pocket 79 in which there is a satisfactory opposingdistance between the liquid surface

F of the liquid matter and the inner surface of the top 73 in order

to enable the air pocket 79 to overlap the opening of the stopper

78 and enable the liquid matter to be drawn easy and quickly even

when the paper container 70 with a stopper is tilted by a large

angle.

However, conversely, when the top 73 has a large inclination,

a height of the paper container 70 with a stopper is increased in

accordance with the inclination. Consequently, there arise

problems in that a redundant space is required for, for example,

storage and transportation of the paper container 70 with a stopper,

and that a redundant amount of a material is required.

[0010] As a result of tests and studies conducted repeatedly

in order to solve the problems described above, the inventors of

the present invention have conceived the present invention.

[0011] The present invention has an object to provide a paper

container with a stopper, which is capable of smoothly discharging

a liquid matter from a container main body, and reducing a residue

of the liquid matter in the container main body.

Solution to Problem

[0012] In order to achieve the above-mentioned object,

according to the invention described in claim 1, there is provided

a paper container with a stopper, including: a container main body

including a body having a square tubular shape and including a front panel, a right side panel, a back panel, and a left side panel; a bottom configured to seal a lower opening of the body; and a flat top configured to seal an upper opening of the body; and a stopper provided on the top, wherein the stopper is provided at a position adjacent to a first top corner portion among four top corner portions of the top, the first top corner portion being formed by a top side of the front panel and a top side of any one of the left side panel and the right side panel, and wherein the body includes a first recessed portion in a first body corner portion among four body corner portions formed by the front panel, the right side panel, the backpanel, and the left sidepanel, the firstbodycornerportion being formed between the front panel and any one of the left side panel and the right side panel forming the first top corner portion at which the stopper is provided, the first recessed portion being surrounded by two recessed-portion forming folding line portions extending from a starting point, which is located at the first top corner portion or at a position slightly away from the first top corner portion, branching from the starting point to the front panel and any one of the left side panel and the right side panel so as to extend toward the bottom direction, and joining together at an end point, which is located at a position within a range in which the two recessed-portion forming folding line portions extend until after reaching a first bottom corner portion formed by a bottom side of the front panel and a bottom side of any one of the left side panel and the right side panel.

[0013] According to the invention described in claim 1, the

stopper is provided at the position adjacent to the first top corner

portion among the four top corner portions of the top, and the first

top corner portion is formed by the top side of the front panel

and the top side of any one of the left side panel and the right

side panel. Therefore, when the liquid matter contained inside the

container is discharged, the container main body is tilted so that

the first top corner portion adjacent to the stopper is directed

downward. Thus, the first body corner portion, which is formed

between the front panel and any one of the left side panel and the

right side panel forming the first top corner portion, is arranged

in a trough-like manner, thereby being capable of guiding the liquid

matter in the container main body toward the stopper direction.

Further, when contents are the viscous matter, the viscous matter

sticking to an inner surface of the body separates from the inner

surface of the body, and can be collected in the first body corner

portion arranged in a trough-like manner. Thus, the liquid matter

can be smoothly discharged, and a residue of the liquid matter can

be reduced.

[0014] Further, in the first body corner portion between the

front panel and any one of the left side panel and the right side

panelformingthe firsttopcornerportion, the firstrecessedportion

is formed. The first recessed portion is surrounded by the two

recessed-portion forming folding line portions extending from the

starting point, which is located at the first top corner portion or at the position slightly away from the first top corner portion, branching from the starting point to the front panel and any one of the left side panel and the right side panel so as to extend toward the bottom direction, and joining together at the end point, which is located at the position within the range in which the two recessed-portion forming folding line portions extend until after reaching the first bottom corner portion formed by the bottom side of the front panel and the bottom side of any one of the left side panel and the right side panel. Accordingly, when the first body corner portion is seen from an inner surface side of the container, owing to the first recessed portion, a gentle swelling is formed in the first body corner portion.

[0015] Owing to the swelling, an edge portion of the first

recessedportiononthefirsttopcornerportionsideformsaninclined

surfaceinclinedtowardthe stopperdirection. Owingtotheinclined

surface, flow velocity of the liquid matter at the time of discharge

of the liquid matter is increased. As a result, the liquid matter

can be smoothly discharged, and a residue of the liquid matter can

bereduced. Especiallywhentheliquidmatterincludesasolidmatter

or the liquid matter is a viscous matter, the liquid matter can

be smoothly discharged, and a residue of the liquid matter can be

reduced.

[0016] Further, owing to the swelling formed in the first body

corner portion by the first recessed portion, a smooth surface is

formed in the first body corner portion, and angles formed between the smoothsurface and the frontpanelandbetween the smoothsurface and the side panel at the two recessed-portion forming folding line portions are increased. Accordingly, resistance against the flow of the liquid matter in contact with the first body corner portion is reduced as compared to that at a body corner portion of the related-art paper container for liquid, which has a substantially right angle, and the flowvelocity ofthe liquidmatterisincreased.

Even when the liquid matter includes the solid matter, the solid

matter can be effectively prevented from being jammed in the first

body corner portion. Further, even when the liquid matter is the

viscous matter, the viscous matter can be effectively prevented

fromsticking to the inner surface of the body. Even when the liquid

matter includes the solid matter or the liquid matter is the viscous

matter, the liquid matter can be smoothly discharged, and a residue

of the liquid matter can be reduced.

[0017] According to the invention described in claim 2, in the

invention described in claim1, the top includes an inclined surface

so that a front panel side of the top is low and a back panel side

of the top is high.

[0018] According to the invention described in claim 2, the

top includes the inclined surface so that the front panel side of

the topislowandthebackpanelsideofthetopishigh. Accordingly,

at the time of discharge of the liquid matter, when the container

main body is tilted under a state in which the first top corner

portion is directed downward, a corner portion (hereinafter, referred to as a second top corner portion), which is diagonally opposite to the first top corner portion and formed by a top side of the back panel and a top side of the side panel, is directed upward. An apex of an air pocket formed in the top of the tilted container main body matches the second top corner portion.

[0019] Thus, when the container main body is tilted under a

state in which the first top corner portion is directed downward,

an opposing distance between a liquid surface and an inner surface

of the top is increased as compared to that in the related-art paper

containerwithastopper, whichisillustratedinFIG.21andincludes

the top formed so as to have the same inclination angle as that

of the top of the present invention. As a result, at the time of

discharge of the liquid matter, even when the paper container with

a stopper is tilted by a larger angle than the related-art paper

container with a stopper, a communication state between an upper

portion of the opening of the stopper and the air pocket can be

maintained, andtheliquidmattercanbe dischargedwhile suppressing

pulsation of the liquid matter. Accordingly, the liquid matter can

be discharged easily, quickly, and smoothly.

[0020] According to the invention described in claim 3, in the

invention described in claim 1 or 2, a length of the first recessed

portion from the starting point to the end point is equal to or

larger than 50% of a height of the front panel of the body.

[0021] According to the invention described in claim 3, the

length of the first recessed portion from the starting point to the end point is set to be equal to or larger than 50% of the height of the front panel. Thus, separation of the solid matter or the viscousmatterfromawallsurfacecanbemoreeffectivelyaccelerated, and hence the solid matter or the viscous matter can be smoothly discharged. Further, when the length from the starting point to the end point is set to be equal to or larger than 50% of the height, eye-catchability of the container can be enhanced, and a container excellent in design property can be provided.

[0022] According to the invention described in claim 4, in the

invention described in any one of claims 1 to 3, a width of a widest

portion of the first recessed portion in a horizontal direction

is equal to or larger than 10% of a width of the front panel of

the body and smaller than 30% of the width of the front panel of

the body.

[0023] According to the invention described in claim 4, the

width of the widest portion of the first recessed portion in the

horizontal direction is set to be equal to or larger than 10% of

the width of the front panel of the body. Thus, contents such as

the solid matter can be prevented from accumulating in or sticking

to the corner portion, and hence the contents can be smoothly

discharged while preventing a residue of the contents. Further,

the width of the widest portion of the first recessed portion in

the horizontal direction is set to be smaller than 30% of the width

ofthe frontpanelofthebody, andhence the containercanbe reliably

graspedinafillingmachine configuredtomoldthe container, thereby being capable of stably molding the container.

[0024] According to the invention described in claim 5, in the

paper container with a stopper described in the invention described

in any one of claims 1 to 4, the container main body is formed of

a single blank sheet, the blank sheetbeingmade ofapaper container

material obtained by laminating a sealant on at least a back surface

side of a paperboard base material, the blank sheet including: a

front panel, a right side panel, a back panel, and a left side panel,

which are configured to form the body, and contiguous through body

vertical folding lines; a pair of top surface panels, which is

configured to form the top, and contiguous with an upper end of

the front panel and an upper end of the back panel through top

horizontal folding lines so as to be opposed to each other; a pair

of folding surface panels, which is configured to form the top,

and contiguous with an upper end of the left side panel and an upper

end of the right side panel through top horizontal folding lines

soas tobe opposedtoeachother; sealingpanels, whichare contiguous

with upper ends of the top surface panels and upper ends of the

side panels through sealing-portion horizontal folding lines; a

pair of bottom surface panels, which is contiguous with a lower

end of the front panel and a lower end of the back panel through

bottom horizontal folding lines so as to be opposed to each other;

and a pair of inner surface panels, which is contiguous with a lower

end of the left side panel and a lower end of the right side panel

through bottom horizontal folding lines so as to be opposed to each other, wherein, in the top surface panel contiguous with the upper end of the front panel, a stopper mounting opening portion is formed at aposition adjacent to an intersection point of the top horizontal folding line at the upper end of the front panel and a top vertical folding line between the top surface panel and any one of the pair of folding surface panels, the top horizontal folding line and the top vertical folding line forming the first top corner portion, and wherein the body vertical folding line between the front panel and any one of the left side panel and the right side panel forms the first body corner portion, is continuous with the intersection point, and includes two recessed-portion forming folding line portions configured to form the first recessed portion, the two recessed-portion forming folding line portions extending from a starting point, which is located at the intersection point or at a position slightly away from the intersection point, branching from the starting point to the front panel and any one of the left side panel and the right side panel so as to extend toward the bottom horizontal folding line of the front panel and the bottomhorizontal folding line of any one of the left side panel and the right side panel, and joining together at an end point, which is located at a position within a range in which the two recessed-portion forming folding line portions extend until after reaching an intersection point of the bottom horizontal folding line of the front panel and the bottom horizontal folding line of any one of the left side panel and the right side panel.

[0025] According to the invention described in claim 5, the

container main body is formed of the single blank sheet, and hence

can be easily manufactured.

[0026] According to the invention described in claim 6, there

is provided a paper container with a stopper includes: a container

mainbodyincluding:abodyhavingasquare tubularshapeandincluding

a front panel, a right side panel, a back panel, and a left side

panel; a bottom configured to seal a lower opening of the body;

and a flat square top configured to seal an upper opening of the

body; and a stopper provided on the top, wherein the top includes

an inclined surface so that a front panel side of the top is low

and a back panel side of the top is high, and wherein the stopper

is provided at a position adjacent to a first top corner portion

among four top corner portions of the top, the first top corner

portion being formed by a top side of the front panel and a top

side of any one of the left side panel and the right side panel.

[0027] According to the invention described in claim 6, the

top includes the inclined surface so that the front panel side of

the top is low and the back panel side of the top is high, and the

stopper is provided at the position adjacent to the first top corner

portion among the four top corner portions of the top. The first

top corner portion is formed by the top side of the front panel

and the top side of any one of the left side panel and the right

side panel. Accordingly, at the time of discharge of the liquid

matter, when the container main body is tilted under a state in which the first top corner portion is directed downward, a corner portion (hereinafter, referred to as a second top corner portion), which is diagonally opposite to the first top corner portion and formed by a top side of the back panel and a top side of the side panel, is directed upward. An apex of an air pocket formed in the top of the tilted container main body matches the second top corner portion.

[0028] Thus, when the container main body is tilted under a

state in which the first top corner portion is directed downward,

an opposing distance between a liquid surface and an inner surface

of the top is increased as compared to that in the related-art paper

container with a stopper, which is illustrated in FIG. 7 and includes

the top formed so as to have the same inclination angle as that

of the top of the present invention. As a result, at the time of

discharge of the liquid matter, even when the paper container with

a stopper is tilted by a larger angle than the related-art paper

container with a stopper, a communication state between an upper

portion of the opening of the stopper and the air pocket can be

maintained, andtheliquidmattercanbe dischargedwhile suppressing

pulsation of the liquid matter. Accordingly, the liquid matter can

be discharged easily, quickly, and smoothly.

Advantageous Effects of Invention

[0029] As described above, according to the paper container

with a stopper of the present invention, as compared to a container that does not employ the technology of the present invention, the liquid matter can be discharged from the container main body more smoothly, and a residue of the liquid matter in the container main body can be reduced.

Brief Description of Drawings

[00301 FIG. 1is a right-hand side view for illustrating a first

example ofapapercontainerwithastopperaccordingtoanembodiment

of the present invention.

FIG. 2 is a perspective view for illustrating the paper

container with a stopper of FIG. 1 when seen from an upper side

of the paper container with a stopper.

FIG. 3 is a perspective view for illustrating the paper

container with a stopper of FIG. 2 when seen from a side diagonally

opposite to the viewpoint of FIG. 2.

FIG. 4 is anexplanatoryview forillustratinga first recessed

portion.

FIG. 5 is an explanatoryview forillustrating another example

of the first recessed portion.

FIG. 6is an explanatoryview forillustrating another example

of the first recessed portion.

FIG. 7 is an explanatoryview forillustrating another example

of the first recessed portion.

FIG. 8 is an explanatoryview forillustrating another example

of the first recessed portion.

FIG. 9is an explanatoryview forillustrating another example

of the first recessed portion.

FIG.10isanexplanatoryviewforillustratinganotherexample

of the first recessed portion.

FIG. 11 is an explanatory view for illustrating a position

of a stopper when a liquid matter is discharged.

FIG. 12 is a sectional explanatory view for illustrating a

state in which the liquid matter is discharged.

FIG.13is aplanviewforillustratingablank sheet configured

to form a container main body of the container with a stopper of

FIG. 1.

FIG. 14 is a right-hand side view for illustrating a second

example of the paper container with a stopper according to the

embodiment of the present invention.

FIG. 15 is a perspective view for illustrating the paper

container with a stopper of FIG. 14 when seen from the upper side

of the paper container with a stopper.

FIG. 16 is a perspective view for illustrating the paper

containerwithastopperofFIG.14whenseenfromadiagonaldirection

of a body.

FIG. 17 is a schematic vertical sectional explanatory view

of FIG. 16.

FIG. 18 is an explanatory view for illustrating a state in

which the container main body is tilted at the time of discharge

of the liquid matter.

FIG.19is aplanviewforillustratingablank sheetconfigured

to form the container main body of the container with a stopper

of FIG. 14.

FIG. 20 is a perspective view for illustrating a related-art

paper container with a stopper when seen from an upper side of the

related-art paper container with a stopper.

FIG. 21 is a schematic vertical sectional explanatory view

of FIG. 20.

FIG. 22 is an explanatory view for illustrating a state in

which a container main body is tilted at the time of discharge of

the liquid matter.

Description of Embodiments

[0031] Now, an example of a paper container with a stopper

according to an embodiment of the present invention is described

in detail with reference to the drawings.

FIG. 1 to FIG. 13 are illustrations of a first example of the

paper container with a stopper according to the embodiment of the

presentinvention. FIG.1is aright-handsideviewforillustrating

the first example of the paper container with a stopper. FIG. 2

is a perspective view for illustrating the paper container with

astopper ofFIG.1when seen fromanupper side ofthepapercontainer

with a stopper. FIG. 3 is a perspective view for illustrating the

paper container with a stopper of FIG. 2 when seen from a side

diagonally opposite to the viewpoint of FIG. 2. FIG. 4 is an explanatory view for illustrating a first recessed portion. FIG.

to FIG. 10 are explanatory views each for illustrating another

example of the first recessed portion. FIG. 11 is an explanatory

view for illustrating a position of a stopper when a liquid matter

is discharged. FIG. 12 is a sectional explanatory view for

illustrating a state in which the liquid matter is discharged. FIG.

13 is a plan view for illustrating a blank sheet configured to form

a container main body of the container with a stopper of FIG. 1.

[0032] A paper container 1 with a stopper in the first example

includes a container main body 9 and a stopper 10. The container

main body 9 includes a body 6 having a square tubular shape and

including a front panel 2, a right side panel 3, a back panel 4,

and a left side panel5, abottom7 configured to seala lower opening

portion of the body 6, and a flat top 8 configured to seal an upper

opening portion of the body 6. The stopper 10 is provided on the

top 8. In the first example, the container main body 9 is formed

of a single blank sheet described later.

The flat top 8 described herein means that the top 8 does not

have a projecting shape unlike, for example, a gable top type. The

flat top 8 encompasses a top having a configuration in which a front

side and a back side of the top 8 are different in level and the

top 8 includes an inclined surface.

[0033] The stopper 10 provided on the top 8 is provided at a

position adjacent to a first top corner portion 11 (A) among four

top corner portions 11 of the top 8. The first top corner portion

11 (A) is formed by a top side 2a of the front panel 2 and any one

of a top side 3a of the right side panel 3 and a top side 5a of

the left side panel 5. In the first example, the first top corner

portion 11(A) is formed by the top side 2a of the front panel 2

and the top side 3a of the right side panel 3.

Theadjacentpositiondescribedhereinmeansapositionshifted

closer to the first top corner portion 11(A) side from a center

position of the top 8. The adjacent position closer to the first

top corner portion 11(A) is more preferred.

[0034] The body 6 includes a first recessed portion 16 in a

first body corner portion 12(A) among four body corner portions

12 formed by the front panel 2, the right side panel 3, the back

panel 4, and the left side panel 5. The first body corner portion

12 (A) is formed between the front panel 2 and the right side panel

3 forming the first top corner portion 11 (A) at which the stopper

is provided. The first recessed portion 16 is surrounded by two

recessed-portion forming folding line portions 14 and 15 extending

from a starting point S, which is located at the first top corner

portion 11(A) or at a position slightly away from the first top

corner portion 11(A), branching from the starting point S to the

front panel 2 and the right side panel 3 so as to extend toward

the bottom7, and joining together at anendpoint E, whichis located

at apositionwithin arange inwhich the two recessed-portion forming

folding line portions 14 and 15 extend until after reaching a first

bottom corner portion 13 (A) among four bottom corner portions 13 of the bottom 7. The first bottom corner portion 13 (A) is formed by a bottom side 2b of the front panel 2 and a bottom side 3b of the right side panel 3.

[00351 In the first example, the starting point S of the two

recessed-portion forming folding line portions 14 and 15 forming

the first recessed portion 16 is set to the first top corner portion

11 (A) , but the starting point S may be set to a position slightly

away from the first top corner portion 11 (A). When the starting

point S is set to the position slightly away from the first top

corner portion 11(A), it is preferred that the starting point S

be set to a position within a range of 35 mm or less from the first

top corner portion 11(A). When the starting point S is set in this

range, asolidmatterandaviscousmattercanbe smoothlydischarged.

[00361 Further, the end point E of the two recessed-portion

forming folding line portions 14 and 15 is set to the first bottom

corner portion 13 (A), but the end point E may be set to the position

within the range in which the two recessed-portion forming folding

line portions 14 and 15 extend until after reaching the first bottom

corner portion 13 (A) . In this case, when a length L from the starting

point S to the end point E is equal to or larger than 10% of a height

H of the front panel 2 of the body 6, separation of the solid matter

or the viscous matter from a wall surface can be accelerated, which

is preferred. Further, as illustrated in FIG. 4, when the length

L from the starting point S to the end point E is equal to or larger

than 50% of the height H, separation of the solid matter or the viscous matter from the wall surface can be more effectively accelerated, andthe solidmatterortheviscousmattercanbesmoothly discharged, which is more preferred. Further, when the length L from the starting point S to the end point E is set to be equal to or larger than 50% of the height H, eye-catchability of the container can be enhanced, and a container excellent in design property can be provided.

[0037] Further, it is preferred that a width W1 of a widest

portion of the first recessed portion 16 in a horizontal direction

be equal to or larger than 10% of a width W2 of the front panel

2 of the body 6 and smaller than 30% of the width W2 (see FIG. 4).

When the width W1 is set to be equal to or larger than 10% of the

width W2, contents such as the solid matter are prevented from

accumulating in or sticking to the corner portion to thereby remain

in the corner portion. Accordingly, the contents can be smoothly

discharged. Further, when the width W1 is set to be smaller than

% of the width W2, the container can be reliably grasped in a

filling machine configured to mold the container, thereby being

capable of stably molding the container.

[0038] Further, in the first example, the two recessed-portion

forming folding line portions 14 and 15 forming the first recessed

portion16are symmetricwithrespect toanimaginaryline connecting

the first top corner portion 11 (A) and the first bottom corner portion

13 (A) to each other. However, it is not always required that the

two recessed-portion forming folding line portions 14 and 15 be horizontally symmetric to each other.

FIG. 5 to FIG. 10 are illustrations of other examples of the

first recessedportion16 formedby the two recessed-portion forming

folding line portions 14 and 15.

[00391 Further, in the firstexample, asecondrecessedportion

19 is formed at a second body corner portion 12 (B) diagonally opposite

to the first body corner portion 12 (A) . The second recessed portion

19 is surrounded by two recessed-portion forming folding line

portions 17 and18 extending froma startingpoint S, whichis located

at a second top corner portion 11(B) diagonally opposite to the

first top corner portion 11(A) or at a position away from the second

top corner portion 11(B), branching from the starting point S to

the back panel 4 and the left side panel 5 so as to extend toward

the bottom7, and joining together at anendpoint E, whichis located

atapositionwithinarangeinwhichthe tworecessed-portionforming

folding line portions 17 and 18 extend until after reaching a second

bottomcornerportion13(B). The secondbottomcornerportion13(B)

is formed by a bottom side 4b of the back panel 4 and a bottom side

b of the left side panel 5.

[0040] The paper container 1 with a stopper configured as

described above includes, in the first body corner portion 12 (A)

of the body 6 of the containermainbody 9, the first recessedportion

16 surrounded by the two recessed-portion forming folding line

portions 14 and 15 extending from the starting point S, which is

located at the first top corner portion 11 (A) or at the position slightly away from the first top corner portion 11(A), branching from the starting point S to the front panel 2 and the right side panel 3 so as to extend toward the bottom 7 direction, and joining together at the end point E, which is located at the position within the range in which the two recessed-portion forming folding line portions 14 and 15 extend until after reaching the first bottom corner portion 13(A). Accordingly, when the first body corner portion 12 (A) is seen from an inner surface side of the container, owing to the first recessed portion 16, a gentle swelling 20 is formed in the first body corner portion 12 (A), and an edge portion of the first recessed portion 16 on the first top corner portion

11(A) side forms an inclined surface 21 inclined toward the stopper

direction (see FIG. 12).

[0041] When the liquid matter contained inside the container

is discharged, the container main body 9 is tilted so that the first

top corner portion 11 (A) and the first body corner portion 12 (A)

are directed downward (see FIG. 11 and FIG. 12). Thus, the first

body corner portion 12 (A) is arranged in a trough-like manner so

as to guide the liquid matter in the container main body 9 toward

the stopper 10 direction, thereby smoothly discharging the liquid

matter.

[0 042] Further, in the first body corner portion 12 (A) arranged

in a trough-like manner, the edge portion on the first top corner

portion 12(A) side, on which the swelling 20 is formed owing to

the first recessedportion16, forms the inclined surface 21inclined toward the stopper 10 direction. Accordingly, the liquid matter flowing in the container main body 9 toward the stopper 10 direction is increased in flow velocity by the inclined surface 21, and thus the liquid matter is smoothly discharged.

[0043] Further, owing to the swelling 20 formed in the first

body corner portion 12 (A) by the first recessed portion 16, a smooth

surface 22 is formed in the first body corner portion 12(A), and

angles formed between the smooth surface 22 and the front panel

2 and between the smooth surface 22 and the right side panel 5 at

the two recessed-portion forming folding line portions 14 and 15

are increased. Accordingly, resistance against the flow of the

liquid matter in contact with the first body corner portion 12 (A)

is reduced as compared to that at a body corner portion of the

related-art paper container for liquid, which has a substantially

right angle, and the flowvelocity ofthe liquidmatterisincreased.

Even when the liquid matter includes the solid matter, the solid

matter can be effectively prevented from being jammed in the first

body corner portion 12 (A) . Further, even when the liquid matter

is theviscousmatter, theviscousmattercanbeeffectivelyprevented

from sticking to an inner surface of the body 6.

[0044] Further, in the first example, the second recessed

portion 19 is formed at the secondbody corner portion 12 (B) diagonally

opposite to the first body corner portion 12 (A) . The second recessed

portion19is surroundedby the two recessed-portion forming folding

line portions 17 and 18 extending from the starting point S, which is located at the second top corner portion 11 (B) diagonally opposite to the first top corner portion 11(A) or at the position away from the second top corner portion 11 (B) , branching from the starting point S to the back panel 4 and the left side panel 5 so as to extend toward the bottom 7, and joining together at the end point E, which is located at the position within the range in which the two recessed-portion forming folding line portions 17 and 18 extend until after reaching the second bottom corner portion 13 (B) . The second bottom corner portion 13(B) is formed by the bottom side

4b of the back panel 4 and the bottom side 5b of the left side panel

5. Accordingly, when the container main body 9 is held by hand at

thetimeof discharge, the second body corner portion 12 (B) isdirected

to a palm side, and the second recessed portion 19 of the second

body corner portion 12 (B) is held in contact with the palm. Thus,

the container main body 9 can be easily held without causing a pain

by the corner portion, and can be grasped tightly.

[0045] FIG. 13 is an illustration of an example of a blank sheet

A configured to form the paper container 1 with a stopper in the

first example.

The blank sheet 30A is made of a paper container material

obtained by laminating a sealant on at least a back surface side

of a paperboard base material. The blank sheet 30A includes the

front panel 2, the right side panel 3, the back panel 4, and the

left side panel 5, which are configured to form the body 6, and

contiguous through body vertical folding lines 31, 32, and 33.

[0046] A pair of top surface panels 36 and 37 is configured

to form the top 8, and contiguous with an upper end of the front

panel 2 and an upper end of the back panel 4 through top horizontal

folding lines 34 and 35 so as to be opposed to each other. A pair

of folding surface panels 40 and 41 is configured to form the top

8, and contiguous with an upper end of the right side panel 3 and

an upper end of the left side panel 5 through top horizontal folding

lines 38 and39soas tobe opposedtoeachother. Topoblique folding

lines 42 and top oblique folding lines 43 are formed on the folding

surface panels 40 and 41, respectively. Further, sealing panels

48, 49, 50, and 51 are contiguous with the upper ends of the top

surface panels 36 and 37 and the upper ends of the folding surface

panels 40 and 41 through sealing-portion horizontal folding lines

44, 45, 46, and 47, respectively.

[0047] A pair of bottom surface panels 54 and 55 is configured

to form the bottom 7, and contiguous with a lower end of the front

panel 2 and a lower end of the back panel 4 through bottom horizontal

folding lines 52 and 53 so as to be opposed to each other. A pair

of inner surface panels 58 and 59 is configured to form the bottom

7, and contiguous with a lower end of the right side panel 3 and

alowerendofthe left sidepanel5 throughbottomhorizontalfolding

lines 56 and 57 so as to be opposed to each other.

Moreover, a side sealing panel 61 is contiguous with one-side

opening edge of the blank sheet 30A through a side sealing vertical

folding line 60, and is sealed on another-side opening edge of the blank sheet 30A.

[0048] In the top surface panel 36 contiguous with the upper

endofthefrontpanel2 oftheblank sheet30Aconfiguredas described

above, a stopper mounting opening portion 64 is formed at a position

adjacent to an intersection point 63 of the top horizontal folding

line 34 of the front panel 2 and a top vertical folding line 62

between the top surface panel 36 and the folding surface panel 40.

The top horizontal folding line 34 and the top vertical folding

line 62 form the first top corner portion 11(A).

When the blank sheet 30A is formed by laminating an aluminum

sheet between a paperboard material and a sealant, a part of the

paperboard material of the blank sheet 30A may be cut out so that

a part of the aluminum sheet is left.

[0049] Further, the body vertical folding line 31 between the

front panel 2 and the right side panel 3 forms the first body corner

portion 12(A), and is continuous with the intersection point 63.

The body vertical folding line 31includes the two recessed-portion

forming folding line portions 14 and 15 extending from the starting

point S, whichis locatedat the intersectionpoint 63 or at aposition

slightly away from the intersection point 63, branching from the

starting point S to the front panel 2 and the right side panel 3

so as to extend toward the bottom horizontal folding line 52 of

the front panel 2 and the bottom horizontal folding line 56 of the

right side panel 3, and joining together at the end point E, which

is located at a position within a range in which the two recessed-portion forming folding line portions 14 and 15 extend untilafterreachinganintersectionpoint65ofthebottomhorizontal foldingline 52 ofthe frontpanel2 and the bottomhorizontalfolding line 56 of the right side panel3, thereby forming the first recessed portion 16.

[00501 Further, in thisexample, thebodyverticalfoldingline

33 between the back panel 4 and the left side panel 5 forms the

second body corner portion 12 (B) diagonally opposite to the first

body corner portion 12 (A) . The bodyvertical folding line 33 includes

the two recessed-portion forming folding line portions 17 and 18

extending from the starting point S, which is located at an

intersection point 67 of the top horizontal folding line 35 of the

back panel 4 and a top vertical folding line 66 between the top

surface panel 37 and the folding surface panel 41, branching from

the starting point S to the back panel 4 and the left side panel

so as to extend toward the bottom horizontal folding line 53 of

the back panel 4 and the bottom horizontal folding line 57 of the

left side panel 5, and joining together at the end point E, which

is located at a position within a range in which the two

recessed-portion forming folding line portions 17 and 18 extend

untilafterreachinganintersectionpoint68ofthebottomhorizontal

folding line 53 of the backpanel4 and the bottomhorizontalfolding

line 57 of the left side panel5, thereby forming the second recessed

portion 19.

[0051] In this example, the starting point S of the two recessed-portion forming folding line portions 14 and 15 forming the first recessed portion 16 is set to the intersection point 63 of the top horizontal folding line 34 of the front panel 2 and the top vertical folding line 62 between the top surface panel 36 and the folding surface panel 40, but the starting point S may be set to a position slightly away from the intersection point 63.

Further, the end point E of the two recessed-portion forming

folding line portions 14 and 15 is set to the intersection point

of the bottom horizontal folding line 52 of the front panel 2

and the bottom horizontal folding line 56 of the right side panel

3. However, it is only required that the end point E be set to the

position within the range in which the two recessed-portion forming

folding line portions 14 and 15 extend until after reaching the

intersection point 65 of the bottom horizontal folding line 52 of

the front panel 2 and the bottom horizontal folding line 56 of the

right side panel 3.

[0052] Further, the startingpointSofthe tworecessed-portion

forming folding line portions 17 and 18 forming the second recessed

portion 19 is set to the intersection point 67 of the top horizontal

folding line 35 of the back panel 4 and the top vertical folding

line 66 between the top surface panel 37 and the folding surface

panel 41, but the starting point S may be set to a position slightly

away from the intersection point 67.

Further, the end point E of the two recessed-portion forming

folding line portions 17 and 18 is set to the intersection point

68 of the bottom horizontal folding line 53 of the back panel 4

and the bottom horizontal folding line 57 of the left side panel

5. However, it is only required that the end point E be set to the

position within the range in which the two recessed-portion forming

folding line portions 17 and 18 extend until after reaching the

intersection point 68 of the bottom horizontal folding line 53 of

the back panel 4 and the bottom horizontal folding line 57 of the

left side panel 5.

[00531 FIG. 1 to FIG. 12 are illustrations of a second example

of the paper container with a stopper according to the embodiment

of the present invention. FIG. 14 is a right-hand side view for

illustratingthe secondexampleofthepapercontainerwithastopper.

FIG. 15 is a perspective view for illustrating the paper container

with a stopper of FIG. 14 when seen from an upper side of the paper

container with a stopper. FIG. 16 is a perspective view for

illustrating the paper container with a stopper of FIG. 14 when

seen from a diagonal direction of a body. FIG. 17 is a schematic

vertical sectional explanatory view of FIG. 16. FIG. 18 is an

explanatory view for illustrating a state in which the container

main body is tilted at the time of discharge of the liquid matter.

FIG. 19 is a plan view for illustrating a blank sheet configured

to form the container main body of the container with a stopper

of FIG. 14.

In description of the second example, the same components as

those in the first example are denotedby the same reference symbols.

[0054] Similarly to the first example, the paper container 1

with a stopper in the second example includes the container main

body 9 and the stopper 10. The container main body 9 includes the

body 6 having a square tubular shape and including the front panel

2, the right side panel 3, the back panel 4, and the left side panel

, the bottom 7 configured to seal the lower opening portion of

the body 6, and the flat square top 8 configured to seal the upper

opening portion of the body 6. The stopper 10 is provided on the

top 8. In the this example, the container main body 9 is formed

of a single blank sheet described later.

[0055] As illustratedin FIG.14 and FIG.15, the top 8 includes

an inclined surface so that the front panel 2 side of the top 8

is low and the back panel 4 side of the top 8 is high. It is preferred

that an inclination angle of the top 8 be equal to or larger than

100andequaltoorsmallerthan30°. Inacaseinwhichtheinclination

angle e is equal to or larger than 10°, as described later, when

the container main body 9 is tilted at the time of discharge of

the liquid matter, an air pocket allowing the air to pass through

the stopper satisfactorily can be defined. Thus, pulsation of the

liquid matter flowing through the stopper 10 can be effectively

suppressed. In a case in which the inclination angle e is equal

to or smaller than 30° and the liquid matter is a beverage, even

when a person drinks the beverage while putting his/her mouth on

the stopperdirectly, thepersoncaneasilydrink thebeveragewithout

hitting his/her nose against the top surface.

Further, it is preferred that an upper limit value of the

inclination angle of the top 8 be an angle at which an upper end

of an upper surface of the stopper 10 inclined along inclination

of the top 8, and an upper end of the top 8, namely, a top side

4a of the back panel 4 match each other in level. Even when the

inclination angle e of the top 8 is set to a large angle at which

the upper end of the top 8, namely, the top side 4a of the back

panel 4 is higher in level than the upper end of the upper surface

of the stopper 10, no change is seen in the effect of suppressing

pulsation of the liquid matter owing to the air pocket defined by

the configuration with the large inclination angle. When the

inclination angle e is set to such a large angle, a height of the

paper container 1 with a stopper is increased in accordance with

the inclination angle 0, and a larger amount of the material is

required.

[00561 Similarly to the first example, the stopper 10 provided

on the top 8 is provided at a position adjacent to the first top

corner portion 11 (A) among the four top corner portions 11 of the

top 8. The first top corner portion 11(A) is formed by the top side

2a of the front panel 2 and any one of the top side 3a of the right

side panel 3 and the top side 5a of the left side panel 5. In this

example, the first top corner portion 11(A) is formed by the top

side 2a of the front panel 2 and the top side 3a of the right side

panel 3.

Theadjacentpositiondescribedhereinmeansapositionshifted closer to the first top corner portion 11(A) side from a center position of the top 8. The adjacent position closer to the first top corner portion 11(A) is more preferred.

[0057] Further, in the second example, similarly to the first

example, the body 6 includes the first recessed portion 16 in the

first body corner portion 12 (A) among the four body corner portions

12 formed by the front panel 2, the right side panel 3, the back

panel 4, and the left side panel 5. The first body corner portion

12 (A) is formed between the front panel 2 and the right side panel

3 forming the first top corner portion 11(A) at which the stopper

is provided. The first recessed portion 16 is surrounded by the

two recessed-portion forming folding line portions 14 and 15

extending from the starting point S, which is the first top corner

portion 11(A), branching from the starting point S to the front

panel 2 and the right side panel 3 so as to extend toward the bottom

7, and joining together at the end point E, which is located at

a position within a range in which the two recessed-portion forming

folding line portions 14 and 15 extend until after reaching the

first bottom corner portion 13 (A) among the four bottom corner

portions 13 of the bottom 7. The first bottom corner portion 13 (A)

is formed by the bottom side 2b of the front panel 2 and the bottom

side 3b of the right side panel 3.

[0058] In the second example, similarly to the first example,

the starting point S of the two recessed-portion forming folding

line portions 14 and 15 forming the first recessed portion 16 is set to the first top corner portion 11(A), but the starting point

S may be set to a position slightly away from the first top corner

portion 11(A). When the starting point S is set to the position

slightly away fromthe first top cornerportion11(A), itispreferred

that the starting point S be set to a position within a range of

mm or less from the first top corner portion 11(A).

[00591 In the paper container 1 with a stopper configured as

described above, the top 8 includes the inclined surface so that

the front panel 2 side of the top 8 is low and the back panel 4

side of the top 8 is high. Further, the stopper 10 is provided at

a position adjacent to the first top corner portion 11(A) among

the four top corner portions 11 of the top 8. The first top corner

portion 11(A) is formed by the top side 2a of the front panel 2

and the top side 3a of the right side panel 3. Accordingly, at the

time of discharge of the liquid matter, when the container main

body 9 is tilted under a state in which the first top corner portion

11(A) is directed downward, the second top corner portion 11(B),

which is diagonally opposite to the first top corner portion 11(A)

and formed by the top side 4a of the back panel 4 and the top side

a of the left side panel 5, is directed upward. An apex of an air

pocket 23 formed in the top 8 of the tilted container main body

9 matches the second top corner portion 11(B) (see FIG. 18).

[00601 Thus, when the container main body 9 is tilted under

a state in which the first top corner portion 11(A) is directed

downward, an opposing distance between a liquid surface F of the liquid matter and the inner surface of the top 8 is increased as compared to thatin the related-artpaper container 70withastopper, which is illustrated in FIG. 20 and includes the top 73 formed so as to have the same inclination angle as that of the top 8. As a result, at the time of discharge of the liquid matter, even when the paper container 1 with a stopper is tilted by a larger angle than the related-art paper container 70 with a stopper, a communication state between the upper portion of the opening of the stopper 10 and the air pocket 23 can be maintained, and the liquid matter can be discharged while suppressing pulsation of the liquid matter. Accordingly, the liquid matter can be discharged easily, quickly, and smoothly.

[0061] Further, in the second example, similarly to the first

example, in the first body corner portion 12(A) of the body 6 of

the container main body 9, the first recessed portion 16 surrounded

by the two recessed-portion forming folding line portions 14 and

extending from the starting point S, which is located at the

first top corner portion 11(A) or at the position slightly away

from the first top corner portion 11(A), branching from the starting

point S to the front panel 2 and the right side panel 3 so as to

extend toward the bottom 7 direction, and joining together at the

end point E, which is located at the position within the range in

which the two recessed-portion forming folding line portions 14

and 15 extend until after reaching the first bottom corner portion

13(A). Accordingly, when the first body corner portion 12(A) is seen from the inner surface side of the container, owing to the first recessed portion 16, the gentle swelling 20 is formed in the first body corner portion 12 (A), and the edge portion of the first recessedportion 16 on the first top corner portion 11(A) side forms the inclined surface 21 inclined toward the stopper 10 direction

(see FIG. 17).

[0062] With this configuration, when the liquid matter

contained inside the container is discharged, the container main

body 9 is tilted so that the first top corner portion 11(A) and

the first body corner portion 12 (A) are directed downward. Thus,

the first body corner portion 12 (A) is arranged in a trough-like

manner so as to guide the liquid matter in the container main body

9 toward the stopper 10 direction, thereby smoothly discharging

the liquid matter.

[0 0 63] Further, in the first body corner portion 12 (A) arranged

in a trough-like manner, the edge portion on the first top corner

portion 12(A) side, on which the swelling 18 is formed owing to

the first recessedportion16, forms the inclined surface 21inclined

toward the stopper 10 direction. Accordingly, the liquid matter

flowing in the container main body 9 toward the stopper 10 direction

isincreasedinflowvelocitybytheinclinedsurface21, andpulsation

of the liquid matter flowing through the stopper 10 is reduced at

the time of discharge of the liquid matter, thereby being capable

of smoothly discharging the liquid matter.

[0064] Further, owing to the swelling 20 formed in the first body corner portion 12(A) by the first recessed portion 16, the smooth surface 22 is formed in the first body corner portion 12 (A), and the angles formed between the smooth surface 22 and the front panel 2 and the angle formed between the smooth surface 22 and the right side panel 5 at the two recessed-portion forming folding line portions 14 and 15 are increased. Accordingly, resistance against the flow of the liquid matter being in contact with the first body corner portion 12(A) is reduced as compared to that at the body corner portion of the related-art paper container with a stopper, which has a substantially right angle, and the flow velocity of the liquidmatterisincreased. Evenwhen the liquidmatterincludes the solid matter, the solid matter can be effectively prevented from being jammed in the first body corner portion 12 (A) . Further, evenwhen the liquidmatteris the viscousmatter, the viscousmatter can be effectively prevented from sticking to the inner surface of the body 6.

[00651 FIG. 19 is an illustration of an example of a blank sheet

B configured to form the paper container 1 with a stopper in the

second example.

Similarly to the blank sheet 30A in the first example, the

blank sheet 30B in the second example is made of a paper container

material obtained by laminating a sealant on at least a back surface

side of a paperboard base material. The blank sheet 30B includes

the front panel 2, the right side panel 3, the back panel 4, and

the left side panel 5, which are configured to form the body 6, and contiguous through the body vertical folding lines 31, 32, and

33.

[00661 The pair of top surface panels 36 and 37 is configured

to form the top 8, and contiguous with the upper end of the front

panel2 andtheupperendofthebackpanel4 throughthe tophorizontal

folding lines 34 and 35 so as to be opposed to each other. The pair

of folding surface panels 40 and 41 is configured to form the top

8, and contiguous with the upper end of the right side panel 3 and

the upper end of the left side panel 5 through the top horizontal

folding lines 38 and 39 so as to be opposed to each other. The top

oblique folding lines 42 and the top oblique folding lines 43 are

formedonthefoldingsurfacepanels40and4l, respectively. Further,

the sealing panels 48, 49, 50, and 51 are contiguous with the upper

ends of the top surface panels 36 and 37 and the upper ends of the

folding surface panels 40 and 41 through the sealing-portion

horizontal folding lines 44, 45, 46, and 47, respectively.

[0067] Thepair ofbottomsurfacepanels 54 and55is configured

to form the bottom 7, and contiguous with the lower end of the front

panel 2 and the lower end of the back panel 4 through the bottom

horizontal folding lines 52 and 53 so as to be opposed to each other.

The pair of inner surface panels 58 and 59 is configured to form

the bottom 7, and contiguous with the lower end of the right side

panel 3 and the lower end of the left side panel 5 through the bottom

horizontal folding lines 56 and 57 so as to be opposed to each other.

[00681 Moreover, the side sealing panel 61 is contiguous with one-side openingedge ofthe blank sheet 30B through the side sealing vertical folding line 60, and is sealed on another-side opening edge of the blank sheet 30B.

[00691 In the top surface panel 36 contiguous with the upper

endofthe frontpanel2 oftheblank sheet30Bconfiguredas described

above, the stoppermountingopeningportion 64is formedataposition

adjacent to the intersection point 63 of the top horizontal folding

line 34 of the front panel 2 and the top vertical folding line 62

between the top surface panel 36 and the folding surface panel 40.

The top horizontal folding line 34 and the top vertical folding

line 62 form the first top corner portion 11(A). When the blank

sheet 30B is formed by laminating an aluminum sheet between a

paperboardmaterialand a sealant, apart of the paperboardmaterial

of the blank sheet 30B may be cut out so that a part of the aluminum

sheet is left.

[0070] Further, the body vertical folding line 31 between the

front panel 2 and the right side panel 3 forms the first body corner

portion 12(A), and is continuous with the intersection point 63.

The body vertical folding line 31includes the two recessed-portion

forming folding line portions 14 and 15 extending from the starting

point S, whichis locatedat the intersectionpoint 63 or at aposition

slightly away from the intersection point 63, branching from the

starting point S to the front panel 2 and the right side panel 3

so as to extend toward the bottom horizontal folding line 52 of

the front panel 2 and the bottom horizontal folding line 56 of the right side panel 3, and joining together at the end point E, which is located at a position within a range in which the two recessed-portion forming folding line portions 14 and 15 extend until after reaching the intersection point 65 of the bottom horizontal folding line 52 of the front panel 2 and the bottom horizontalfoldingline 56 of the right side panel3, thereby forming the first recessed portion 16.

[0071] In this example, the starting point S of the two

recessed-portion forming folding line portions 14 and 15 forming

the first recessed portion 16 is set to the intersection point 63

of the top horizontal folding line 34 of the front panel 2 and the

top vertical folding line 62 between the top surface panel 36 and

the folding surface panel 40, but the starting point S may be set

to a position slightly away from the intersection point 63.

Further, the end point E of the two recessed-portion forming

folding line portions 14 and 15 is set to the intersection point

of the bottom horizontal folding line 52 of the front panel 2

and the bottom horizontal folding line 56 of the right side panel

3. However, it is only required that the end point E be set to the

position within the range in which the two recessed-portion forming

folding line portions 14 and 15 extend until after reaching the

intersection point 65 of the bottom horizontal folding line 52 of

the front panel 2 and the bottom horizontal folding line 56 of the

right side panel 3.

Reference Signs List

[0072] 1 paper container with stopper

2 front panel

2a top side

2b bottom side

3 right side panel

3a top side

3b bottom side

4 back panel

4a top side

4b bottom side

left side panel

a top side

b bottom side

6 body

7 bottom

8 top

9 container main body

stopper

11 top corner portion

11(A) first top corner portion

11(B) second top corner portion

12 body corner portion

12(A) first body corner portion

12(B) second body corner portion

13(A) first bottom corner portion

13(B) second bottom corner portion

14, 15 recessed-portion forming folding line portion

16 first recessed portion

17, 18 recessed-portion forming folding line portion

19 second recessed portion

swelling

21 inclined surface

22 smooth surface

23 air pocket

A, 30B blank sheet

31, 32, 33 body vertical folding line

34, 35 top horizontal folding line

36, 37 top surface panel

38, 39 top horizontal folding line

, 41 folding surface panel

42, 43 top oblique folding line

44, 45, 46, 47 sealing-portion horizontal folding line

48, 49, 50, 51 sealing panel

52, 53 bottom horizontal folding line

54, 55 bottom surface panel

56, 57 bottom horizontal folding line

58, 59 inner surface panel

side sealing vertical folding line

61 side sealing panel

62 top vertical folding line

63 intersection point

64 stopper mounting opening portion

intersection point

66 top vertical folding line

67, 68 intersection point

S starting point

E end point

F liquid surface

Claims (6)

1. Claims

   [Claim 1] A paper container with a stopper, including:

   a container main body including:

   a body having a square tubular shape and including a

   front panel, a right side panel, a back panel, and a left side panel;

   a bottom configured to seal a lower opening of the body;

   and

   a flat top configured to seal an upper opening of the

   body; and

   a stopper provided on the top,

   wherein the stopper is provided at a position adjacent to a

   first top corner portion among four top corner portions of the top,

   the first top corner portion being formed by a top side of the front

   panel and a top side of any one of the left side panel and the right

   side panel, and

   wherein the body includes a first recessed portion in a first

   body corner portion among four body corner portions formed by the

   front panel, the right side panel, the back panel, and the left

   side panel, the first body corner portion being formed between the

   front panel and any one of the left side panel and the right side

   panel forming the first top corner portion at which the stopper

   is provided, the first recessed portion being surrounded by two

   recessed-portion forming folding line portions extending from a

   starting point, which is located at the first top corner portion

   or at a position slightly away from the first top corner portion, branching from the starting point to the front panel and any one of the left side panel and the right side panel so as to extend toward the bottom direction, and joining together at an end point, which is located at a position within a range in which the two recessed-portion forming folding line portions extend until after reaching a first bottom corner portion formed by a bottom side of the front panel and a bottom side of any one of the left side panel and the right side panel.
2. [Claim 2] The paper container with a stopper according to claim

   1, wherein the top includes an inclined surface so that a front

   panel side of the top is low and a back panel side of the top is

   high.
3. [Claim 3] The paper container with a stopper according to claim

   1 or 2, wherein a length of the first recessed portion from the

   starting point to the end point is equal to or larger than 50% of

   a height of the front panel of the body.
4. [Claim 4] The paper container with a stopper according to any one

   of claims 1 to 3, wherein a width of a widest portion of the first

   recessed portion in a horizontal direction is equal to or larger

   than 10% of a width of the front panel of the body and smaller than

   % of the width of the front panel of the body.
5. [Claim 5] The paper container with a stopper according to any one

   of claims 1 to 4,

   wherein the container main body is formed of a single blank

   sheet, the blank sheet being made of a paper container material

   obtained by laminating a sealant on at least a back surface side

   of a paperboard base material, the blank sheet including:

   a front panel, a right side panel, a back panel, and

   a left side panel, which are configured to form the body, and

   contiguous through body vertical folding lines;

   a pair of top surface panels, which is configured to

   form the top, and contiguous with an upper end of the front panel

   and an upper end of the back panel through top horizontal folding

   lines so as to be opposed to each other;

   a pair of folding surface panels, which is configured

   to form the top, and contiguous with an upper end of the left side

   paneland anupper end of the right side panelthrough tophorizontal

   folding lines so as to be opposed to each other;

   sealing panels, which are contiguous with upper ends

   of the top surface panels and upper ends of the side panels through

   sealing-portion horizontal folding lines;

   a pair of bottom surface panels, which is contiguous

   with a lower end of the front panel and a lower end of the back

   panel through bottom horizontal folding lines so as to be opposed

   to each other; and

   a pair ofinner surface panels, which is contiguous with a lower end of the left side panel and a lower end of the right sidepanelthroughbottomhorizontalfoldinglines so as tobe opposed to each other, wherein, in the top surface panel contiguous with the upper end of the front panel, a stopper mounting opening portion is formed at aposition adjacent to an intersection point of the tophorizontal folding line at the upper end of the front panel and a top vertical folding line between the top surface panel and any one of the pair of folding surface panels, the top horizontal folding line and the top vertical folding line forming the first top corner portion, and wherein the bodyverticalfoldingline between the frontpanel and any one of the left side panel and the right side panel forms the first body corner portion, is continuous with the intersection point, and includes two recessed-portion forming folding line portions configured to form the first recessed portion, the two recessed-portion forming folding line portions extending from a starting point, which is located at the intersection point or at a position slightly away from the intersection point, branching from the starting point to the front panel and any one of the left side panel and the right side panel so as to extend toward the bottom horizontal folding line of the front panel and the bottomhorizontal folding line of any one of the left side panel and the right side panel, and joining together at an end point, which is located at a position within a range in which the two recessed-portion forming folding line portions extend until after reaching an intersection point of the bottom horizontal folding line of the front panel and the bottom horizontal folding line of any one of the left side panel and the right side panel.
6. [Claim 6] A paper container with a stopper, including:

   a container main body including:

   a body having a square tubular shape and including a

   front panel, a right side panel, a back panel, and a left side panel;

   a bottom configured to seal a lower opening of the body;

   and

   a flat square top configured to seal an upper opening

   of the body; and

   a stopper provided on the top,

   wherein the top includes an inclined surface so that a front

   panel side of the top is low and a back panel side of the top is

   high, and

   wherein the stopper is provided at a position adjacent to a

   first top corner portion among four top corner portions of the top,

   the first top corner portion being formed by a top side of the front

   panel and a top side of any one of the left side panel and the right

   side panel.