JP5234932B2 - Paper container - Google Patents

Description

  The present invention relates to a paper container having a gable roof-type top that contains beverage liquids such as milk and juice.

  Conventionally, as a paper container for beverages represented by a milk carton, it is made of a paperboard material in which thermoplastic resins are laminated on the front and back surfaces, and is provided with four torso panels, and the edges are joined by a vertical seal panel. A cylindrical body is formed, and at the upper end of the body panel, a pair of gable roof forming panels having an outer top seal panel at the top and facing each other, and an inner top seal panel at the top and facing each other. A pair of end wall forming panels that are opened as either spouts are continuously provided, and the pair of end wall forming panels are folded between the pair of gable roof forming panels, and each top seal panel is in a predetermined state. A gable roof type paper container (gable top type) is widely used in which the top is formed by being heated and sealed in place and sealed.

  The opening of the spout of such a gable roof type paper container is performed by peeling off the heat-sealed opposing surfaces of the outer top seal panel and the inner top seal panel on the side of the end wall forming panel serving as the spout. Pull out the end wall forming panel folded between the roof forming panels and fold outward from the top horizontal fold line at the boundary with the trunk panel connected via the top horizontal fold line to open the spout It is done. The spout opened and formed in this way has a long rhombus shape in the lateral direction, the opening area of the spout is small, and the liquid flows out in a laterally spread state, making it difficult to pour.

  Therefore, in order to obtain a spout that is easy to pour, a fold line for the spout in the vertical direction from the center of the gable wall forming panel that is folded between a pair of gable roof forming panels to the trunk panel side that is continuous A paper container is proposed in which a gable wall forming panel is pulled out between a pair of gable roof forming panels, and the gable wall forming panel and the body panel are folded from the pour-out folding line to form a spout. (For example, refer to Patent Document 1).

According to this paper container, the spout that is opened and formed has a long rhombus shape in the vertical direction, and at the time of pouring, the liquid is formed into a V-section formed by mountain folding on the end wall forming panel and the body panel. It is guided in the direction of the spout, and converges at the deep V portion below the spout and flows out smoothly.
Japanese Utility Model Publication No. 7-33820

  In the paper container, a fold line for the spout is provided in the vertical direction from the center of the gable wall forming panel that is folded between a pair of gable roof forming panels, to the trunk panel side that is continuously provided, Pull out the end wall forming panel from between the gable roof forming panels, and fold the end wall forming panel and the body panel from the outlet fold line to form a spout, so that the spout formed by opening is formed in the vertical direction. Furthermore, there is a problem in that the angle of the folds of the end wall forming panel and the body panel is likely to be deep (acute angle) due to the spout folding line, and the opening area of the spout is reduced. In particular, when the body of the container is strongly grasped at the time of pouring, the end wall forming panel and the body panel are easily folded in a mountain, and the angle of the mountain fold is deeper (acute), and the formed spout is in the vertical direction. Therefore, there is a problem that a longer rhombus shape is formed, the opening area of the spout becomes smaller, the liquid flow rate becomes smaller, and the pouring becomes difficult.

  An object of the present invention is to provide a paper container that allows a spout to be opened greatly and that allows liquid to be easily poured from the spout.

  In order to achieve the above object, the invention described in claim 1 is made of a paperboard material in which a thermoplastic resin is laminated on the front and back surfaces, and includes four body panels, the edges of which are joined by vertical seal panels. A rectangular tubular body is formed, and a pair of gable roof forming panels having an outer top seal panel at the top and facing each other at the upper end of the body panel, and an inner top seal panel at the top and facing each other. A pair of gable wall forming panels that are opened as a spout, and the pair of gable wall forming panels are folded between the pair of gable roof forming panels, and the outer top seal panel and the inner side In a gable roof type paper container in which a top is formed by heating and sealing and sealing a top seal panel at a predetermined position, a top horizontal fold line is formed on the opening side wall forming panel. The trunk panel that is continuously provided is provided with a first auxiliary folding line having a downward curved shape that crosses the trunk panel and is connected to or near the trunk vertical folding line on both sides of the trunk panel. The top part extends from both ends of the auxiliary folding line or the vicinity thereof toward the seal side apex of the substantially triangular surface of the unsealed side wall forming panel formed by being folded between the pair of gable roof forming panels. A second auxiliary folding line connected to the horizontal folding line or the vicinity thereof is provided.

  The invention described in claim 2 is characterized in that the second auxiliary folding lines described in claim 1 are curved inwardly of each other.

  According to a third aspect of the present invention, a third auxiliary fold line is provided on an extended line of the second auxiliary fold line on the substantially triangular surface of the opening-side end wall forming panel according to the first or second aspect. It is characterized by being.

  According to a fourth aspect of the present invention, the top horizontal folding line at the boundary between the pair of gable roof forming panels and the trunk panel connected to the pair of gable roof forming panels according to the first, second, or third aspect is as follows: It is characterized by an upward curve.

  According to a fifth aspect of the present invention, the outer top according to the fourth aspect defines a seal width of a top seal portion formed by heating and sealing the outer top seal panel and the inner top seal panel at a predetermined position. The seal horizontal fold line at the boundary between the seal panel and the pair of gable roof forming panels has an upward curved shape inclined downward from the opening side toward the non-opening side, and the pair of gable roof forming panels and The top horizontal fold line at the boundary of the body panel is inclined substantially parallel to the seal horizontal fold line.

According to a sixth aspect of the present invention, in the first aspect of the present invention, the trunk panel that crosses the trunk panel is provided on the trunk panel that is connected to the panel for forming the end wall according to the first, second, third, fourth, or fifth aspect. An upward curved fourth auxiliary fold line connected to or adjacent to the body vertical fold line on both sides of the first is the lower side of the first auxiliary fold line, and the end of the curved protrusion is the end of the first auxiliary fold line or the vicinity thereof It is provided so that it may touch.

  According to the paper container of claim 1, the trunk panel that crosses the trunk panel that is connected to the opening-side end wall forming panel via the top horizontal folding line is arranged on both sides of the trunk panel. A first auxiliary folding line having a downward curved line connected to or near the vertical folding line is provided, and is formed by being folded between the pair of gable roof forming panels from both ends or the vicinity thereof. A pair of gable roofs are provided when opening the spout because a second auxiliary fold line is provided which extends toward the seal side apex of the substantially triangular surface of the opening side wife wall forming panel and is connected to the top horizontal fold line or the vicinity thereof. Pull out the opening-side wife wall forming panel that is folded between the forming panels, and apply force by sandwiching the top horizontal folding line from both sides at the corners on both sides of the boundary between the opening-side wife wall forming panel and the trunk panel, Torso panel facing down Guided by the linear first auxiliary fold line, it folds down from the first auxiliary fold line, folds down from the second auxiliary fold line, and the trunk panel on the upper side of the first auxiliary fold line projects into a bottom shape with a substantially flat bottom. Then, due to the mountain fold from the second auxiliary fold line, the substantially triangular surface of the opening-side end wall forming panel also folds toward the seal-side apex on the extension line of the second auxiliary fold line, and continues to the trunk panel. Projecting and opening the spout. The spout thus opened has a rhombus shape that is slightly longer in the vertical direction, and the spout can be greatly opened to increase the liquid flow rate.

  Even if the container body is firmly grasped at the time of the pouring, the upper triangular panel of the upper auxiliary folding line and the substantially triangular surface of the end wall forming panel protrude into the bottom of the ship with a substantially flat bottom. The substantially flat surface is not easily bent, and the opening shape of the spout is hardly changed or slightly changed, so that the liquid can be poured easily.

  According to the paper container of the second aspect, since the second auxiliary folding line according to the first aspect is curved inwardly of each other, the wife wall forming panel and the body panel on the opening side When the force is applied so that the top horizontal folding line is sandwiched from both sides at the corners on both sides of the boundary, the body panel is guided to the second auxiliary folding line having an inward curved shape and folds from the second auxiliary folding line. The trunk panel on the upper side of the auxiliary folding line can be easily projected into a ship bottom shape having a substantially flat bottom.

  According to the paper container of the third aspect, the third auxiliary fold line is formed on the extension line of the second auxiliary fold line on the substantially triangular surface of the opening-side end wall forming panel according to the first or second aspect. As it is provided, when force is applied so that the top horizontal fold line is sandwiched from both sides at the corners of the boundary between the opening wall and the body panel, the mountain folds from the second auxiliary fold line of the body panel Accordingly, the substantially triangular surface of the opening-side wife wall forming panel also folds from the third auxiliary folding line on the extension line of the second auxiliary folding line, so that the substantially triangular surface of the opening-side wife wall forming panel becomes the trunk panel. It can be easily projected in the shape of a continuous ship bottom.

  According to the paper container of claim 4, the top of the boundary between the pair of gable roof forming panels and the trunk panel connected to the pair of gable roof forming panels according to claim 1, 2, or 3 Since the horizontal folding line is an upward curve, the trunk panel connected to the gable roof forming panel of the paper container opened by pulling out the gable wall forming panel folded between the pair of gable roof forming panels When holding the torso with your finger, the torso panel will be curved on the inside by the top horizontal fold line that forms an upward curve at the boundary between the torso panel and the pair of gable roof forming panels As a result, the corner portion of the trunk portion on the non-opening side is protruded by that amount, and the corner portion is easily caught by the finger holding the trunk portion.

  According to the paper container of the fifth aspect, the seal width of the top seal portion formed by the outer top seal panel and the inner top seal panel being heated and sealed at a predetermined position according to the fourth aspect is defined. Since the seal horizontal fold line at the boundary between the outer top seal panel and the pair of gable roof forming panels is an upward curve inclined downward from the opening side toward the non-opening side, the seal width of the top seal portion However, on the non-opening side, the seal width is wide and can be easily picked. For example, when one of the paper containers arranged on the refrigerator or the shelf is to be taken out, the top seal portion can be picked up and taken out easily. . Further, since the seal width is wide on the non-opening side of the top seal portion, the strength is increased, and drilling can be performed as necessary.

  In addition, since the top horizontal fold line at the boundary between the pair of gable roof forming panels and the trunk panel is inclined substantially in parallel with the seal horizontal fold line, the area of the gable roof forming panel can be increased, so the printing area is also large. In addition, the visibility of the printed display portion in the gable roof forming panel can be effectively improved regardless of whether the display is in the vertical (stand-up) position or the horizontal position.

According to the paper container of the sixth aspect, the trunk panel is traversed by the trunk panel connected to the end wall forming panel according to the first, second, third , fourth, or fifth aspect, and the trunk panel. An upward curved fourth auxiliary fold line connected to or adjacent to the body vertical fold line on both sides of the first is the lower side of the first auxiliary fold line, and the end of the curved protrusion is the end of the first auxiliary fold line or the vicinity thereof When the force is applied so that the top horizontal fold line is sandwiched from both sides at the corners on both sides of the boundary between the opening wall and the body panel, the body panel has a downward curved shape. The valley is easily and reliably bent from the first auxiliary folding line.

  Hereinafter, the best mode for carrying out the paper container according to the present invention will be described in detail with reference to the embodiments shown in the drawings.

  1 to 9 show an embodiment of a paper container according to the present invention. FIG. 1 is a perspective view showing the paper container of this embodiment. FIG. 2 is a front view of the paper container shown in FIG. 3 is a rear view of the paper container shown in FIG. 1, FIG. 4 is a side view of the paper container shown in FIG. 1, FIG. 5 is a development view showing the carton blank before assembly processing of the paper container shown in FIG. FIG. 7 is a side view showing a state where the paper container of the present embodiment is opened, FIG. 8 is a plan view showing a state where the paper container of the present embodiment is opened, FIG. 9 is an explanatory view showing a state where the opened paper container is gripped.

  The paper container of this example is made of a paperboard material in which thermoplastic resins are laminated on the front and back surfaces, and includes four body panels 4, 5, 6, and 7 via body vertical folding lines 1, 2, 3, An edge portion is joined to a panel 7 by a vertical seal panel 9 provided continuously through a seal vertical folding line 8 to form a square cylindrical body portion 10.

  A pair of gable roof forming panels 13, 14 facing each other via the top horizontal folding lines 11, 12 are connected to the upper ends of the opposing body panel 4, 6 of the cylindrical body 10. Outer top seal panels 17 and 18 are connected to upper portions of the pair of gable roof forming panels 13 and 14 via seal horizontal folding lines 15 and 16. In addition, a pair of end wall forming panels which are opened at the upper ends of the other opposite body panel 5 and 7 of the tubular body 10 and facing each other via the top horizontal folding lines 19 and 20 are opened as spouts. 21 and 22 are connected. Inner top seal panels 25, 26 are connected to upper portions of the pair of end wall forming panels 21, 22 via seal horizontal folding lines 23, 24.

  The pair of end wall forming panels 21 and 22 includes seal lateral fold lines 23 and 24 at the boundaries between the top horizontal fold lines 19 and 20 at the boundary with the body panels 5 and 7 and the inner top seal panels 25 and 26. Folding lines 27 and 28 connected to the center of the cable are provided, and a pair of gable wall forming panels 21 and 22 are folded at the folding lines 27 and 28 and are folded between the pair of gable roof forming panels 13 and 14. The top seal panels 17, 18 and the inner top seal panels 25, 26 are heated and sealed at predetermined positions to form a gable roof type top 29. In this example, the fold lines 27 and 28 provided on the pair of end wall forming panels 21 and 22 are curved downward toward the top horizontal fold lines 19 and 20.

  The trunk panel 5 that is connected to the union side A end wall forming panel 21 via the top horizontal folding line 19 crosses the trunk panel 5, and the trunk vertical folding lines 1 on both sides of the trunk panel 5. A downwardly curved first auxiliary folding line 30 connected to 2 or in the vicinity thereof is provided. The position at which the first auxiliary folding line 30 is provided on the body panel 5 is not particularly limited, but a position that is lowered from the top horizontal folding line 19 by a length corresponding to the vertical width of the end wall forming panel 21 is preferable. When it is provided at this position, it will be described in detail later. When opening the spout, the spout when the end wall forming panel 21 folded between the pair of gable roof forming panels 13 and 14 is opened and opened is opened. Open as much as possible.

  Further, the trunk panel 5 has a substantially triangular surface 21a of a wife wall forming panel 21 formed by being folded between a pair of gable roof forming panels 13 and 14 from both ends of the first auxiliary folding line 30 or in the vicinity thereof. The second auxiliary folding lines 31 and 32 are provided respectively extending toward the seal-side apex and connected to the top horizontal folding line 19 or the vicinity thereof. The second auxiliary folding lines 31 and 32 are curved inward in this example.

  In this example, the third auxiliary folding lines 33 and 34 are provided on the substantially triangular surface 21 a of the end wall forming panel 21 on the extended lines of the second auxiliary folding lines 31 and 32. The third auxiliary folding lines 33 and 34 are also curved inward from each other in the same manner as the second auxiliary folding lines 31 and 32.

  In this example, the body panel 5 connected to the end wall forming panel 21 crosses the body panel 5 and is connected to or near the body vertical folding lines 1 and 2 on both sides of the body panel 5. An upward curved fourth auxiliary folding line 35 connected to the lower side of the first auxiliary folding line 30 is provided on the lower side of the first auxiliary folding line 30 so that the tip of the curved projection or the vicinity thereof is in contact with the tip of the curved projection of the first auxiliary folding line 30.

  In this example, the pair of gable roof forming panels 13 and 14 and the top horizontal folding lines 11 and 12 at the boundary between the trunk panels 4 and 6 connected to the pair of gable roof forming panels 13 and 14 are curved upwards. It has become a shape.

  Also, the outer top seal panels 17 and 18 and the inner top seal panels 25 and 26 are heated and sealed at predetermined positions, and the outer top seal panels 17 and 18 and a pair of gables that define the seal width of the top seal portion 36 formed. The seal horizontal folding lines 15 and 16 at the boundary with the roof forming panels 13 and 14 have an upward curved shape inclined downward from the unsealing side A toward the non-opening side B. And the top horizontal fold line 11, which is the upward curved shape of the boundary between the pair of gable roof forming panels 13 and 14 and the body panels 4 and 6 connected to the pair of gable roof forming panels 13 and 14, 12 is also inclined substantially parallel to the seal transverse fold lines 15 and 16.

  A pair of outer panels 39, 40 facing each other via bottom lateral folding lines 37, 38 are connected to the lower ends of the opposing body panels 4, 6 of the cylindrical body 10 so as to be in contact with each other. A pair of inner panels 43, 44 are connected to the lower ends of the other opposing body panel 5, 7 via bottom lateral folding lines 41, 42, and a pair of inner panels 39, 40 are paired between the pair of outer panels 39, 40. Panels 43 and 44 are folded, heated, sealed and sealed to form bottom 45.

  According to the paper container of the present embodiment configured as described above, when opening the spout, the end wall forming panel 21 folded between the pair of gable roof forming panels 13 and 14 is pulled out to form the end wall. When force is applied to the corners on both sides of the boundary between the panel 21 and the body panel 5 so as to be sandwiched from both sides of the top horizontal folding line 19, the body panel 5 is guided to a first auxiliary folding line 30 having a downwardly curved shape. The valley breaks from the broken line 30. At this time, in this example, the upwardly curved fourth auxiliary folding line 35 is located below the first auxiliary folding line 30 on the body panel 5, and the tip of the curved projection is the tip of the curved projection of the first auxiliary folding line 30 or the vicinity thereof. Therefore, the trunk panel 5 is easily and reliably bent from the downwardly curved first auxiliary folding line 30. At the same time, the trunk panel 5 is broken from the second auxiliary folding lines 31 and 32, and the trunk panel 5 on the upper side of the first auxiliary folding line 30 protrudes in a ship bottom shape having a substantially flat bottom. Then, due to the mountain folds from the second auxiliary folding lines 31, 32 of the trunk panel 5, the substantially triangular surface 21 a of the wife wall forming panel 21 is also hilled toward the seal-side apex on the extension line of the second auxiliary folding lines 31, 32. It bends and protrudes in the shape of a ship bottom connected to the trunk panel 5 and opens the spout 46. The spout 46 thus opened has a diamond shape slightly longer in the vertical direction, and the spout 46 opens greatly.

  At this time, if the first auxiliary folding line 30 is provided on the trunk panel 5 at a position lower than the top horizontal folding line 19 by a length corresponding to the vertical width of the wife wall forming panel 21, a pair of gable roof forming panels 13 is provided. , 14, the spout 46 is opened to a maximum extent when the end wall forming panel 21 folded between the two is pulled out and opened.

  Even when the container body is strongly grasped at the time of pouring, the upper triangular panel 21a of the upper body panel 5 and the end wall forming panel 21 of the first auxiliary folding line 30 protrudes into a substantially flat bottom. The substantially flat surface of the bottom of the ship is not easily bent, and the opening shape of the spout 46 is hardly changed or slightly changed.

  Further, in this example, the second auxiliary folding lines 31 and 32 are curved inwardly of each other, so that both sides of the top horizontal folding line 19 are formed at both corners of the boundary between the end wall forming panel 21 and the body panel 5. Since the body panel 5 is guided by the inwardly curved second auxiliary folding lines 31 and 32 and folds from the second auxiliary folding lines 31 and 32 when a force is applied so as to sandwich the first auxiliary folding line 30, the first auxiliary folding line 30 The upper body panel 5 can be easily projected in a ship bottom shape having a substantially flat bottom.

  In this example, since the third auxiliary folding lines 33 and 34 are provided on the substantially triangular surface 21a of the end wall forming panel 21 on the extended line of the second auxiliary folding lines 31 and 32, the end wall forming panel 21 and the trunk When a force is applied to the corners on both sides of the boundary of the front panel 5 from both sides of the top horizontal fold line 19, due to mountain folds from the second auxiliary fold lines 31 and 32 of the body panel 5, the wife wall forming panel 21 Since the substantially triangular surface 21a is also mountain-folded from the third auxiliary folding lines 33 and 34 on the extended line of the second auxiliary folding lines 31 and 32, the substantially triangular surface 21a of the end wall forming panel 21 is connected to the trunk panel 5 in a ship bottom shape. Can be easily projected.

  Moreover, in this example, since the folding lines 27 and 28 provided in the pair of end wall forming panels 21 and 22 are downwardly curved toward the top horizontal folding lines 19 and 20, the pair of gable roof forming panels 13 , 14, both inner sides of the folded portions of the end wall forming panels 21 and 22 are convex curved surfaces, so that they can be easily hooked with fingers when opened.

  Further, in this example, the pair of gable roof forming panels 13 and 14 and the top horizontal folding lines 11 and 12 at the boundary between the trunk panels 4 and 6 connected to the pair of gable roof forming panels 13 and 14 are upward curves. Since it has a shape, a trunk panel connected to the gable roof forming panels 13 and 14 of the paper container opened by pulling out the gable wall forming panel 21 folded between the pair of gable roof forming panels 13 and 14. 4 and 6, when the body is gripped and held, the body panels 4 and 6 are deformed so as to be curved inward by the top horizontal folding lines 11 and 12 that are curved upward. As a result, the corner portion of the body portion on the non-opening side B is in a protruding state, and the corner portion is easily caught by the finger that has gripped the body portion.

  Further, in this example, the outer top seal panels 17 and 18 and the inner top seal panels 25 and 26 are heated and sealed at predetermined positions to define the seal width of the top seal portion 36 formed. And the pair of gable roof forming panels 13 and 14, the seal horizontal fold lines 15 and 16 are in an upward curve inclined downward from the opening side A toward the non-opening side B. The non-open side B has a wide seal width and can be easily picked. For example, when one of the paper containers arranged on the refrigerator or the shelf is to be taken out, the top seal portion 36 is easily picked. Can be taken out. Further, since the seal width is wide on the non-opening side B of the top seal portion 36, the strength is increased, and drilling can be performed as necessary.

  Moreover, since the top horizontal fold lines 11 and 12 at the boundary between the pair of gable roof forming panels 13 and 14 and the trunk panels 4 and 6 are inclined substantially parallel to the seal horizontal fold lines 15 and 16, the gable roof forming panel 13 , 14 can be obtained in a large area, and the printing area is large, and the visibility of the printed display area on the gable roof forming panels 13, 14 is good regardless of whether they are in an inverted display or an inverted display.

It is a perspective view which shows one Example of the paper container which concerns on this invention. It is a front view of the paper container shown in FIG. It is a rear view of the paper container shown in FIG. It is a side view of the paper container shown in FIG. It is an expanded view which shows the carton blank before the assembly process of the paper container shown in FIG. It is a front view which shows the state which opened the paper container of a present Example. It is a side view which shows the state which opened the paper container of a present Example. It is a top view which shows the state which opened the paper container of a present Example. It is explanatory drawing which shows the state which grasped the opened paper container.

Explanation of symbols

1, 2, 3 Body vertical fold line 4, 5, 6, 7 Body panel 8 Seal vertical fold line 9 Vertical seal panel 10 Cylindrical body 11, 12 Top horizontal fold line 13, 14 Gable roof forming panel 15, 16 Seal Horizontal fold line 17, 18 Outside top seal panel 19, 20 Top horizontal fold line 21 End wall forming panel 21a Approximate triangular surface of end wall forming panel 22 End wall forming panel 23, 34 Seal side fold line 25, 26 Inner top seal panel 27, 28 Folding line 29 Top 30 First auxiliary folding line 31, 32 Second auxiliary folding line 33, 34 Third auxiliary folding line 35 Fourth auxiliary folding line 36 Top seal part 37, 38 Bottom lateral folding line 39, 40 Outer panel 41, 42 Bottom lateral folding line 43 44 inner panel 45 bottom 46 spout

Claims (6)

It is made of a paperboard material with thermoplastic resin laminated on the front and back surfaces, and it has four barrel panels, the edges of which are joined by vertical seal panels to form a square cylindrical barrel, and the upper end of the barrel panel A pair of gable roof forming panels having an outer top seal panel on the top and facing each other, and a pair of gable wall forming panels having an inner top seal panel on the top and facing each other and opened as a spout The pair of gable wall forming panels are folded between the pair of gable roof forming panels, and the outer top seal panel and the inner top seal panel are heated and sealed at predetermined positions to be sealed. In the gable roof type paper container whose top is formed by
Downwardly connected to or near the trunk vertical fold line on both sides of the trunk panel, across the trunk panel, to the trunk panel connected to the opening-side end wall forming panel via the top horizontal fold line A curved first auxiliary fold line is provided, and a substantially triangular shape of the opening-side wife wall forming panel formed by being folded between the pair of gable roof forming panels from or near both ends of the first auxiliary fold line. A paper container comprising a second auxiliary fold line extending toward the seal-side apex of the surface and connected to the top horizontal fold line or the vicinity thereof.   The paper container according to claim 1, wherein the second auxiliary folding lines are curved inwardly of each other.   3. The paper container according to claim 1, wherein a third auxiliary folding line is provided on a substantially triangular surface of the opening-side end wall forming panel on an extension line of the second auxiliary folding line. 4.   The top horizontal folding line at the boundary between the pair of gable roof forming panels and the body panel connected to the pair of gable roof forming panels is an upward curved line. A paper container as described in 1.   The seal horizontal fold line at the boundary between the outer top seal panel and the pair of gable roof forming panels, which defines the seal width of the top seal portion formed by heating the outer top seal panel and the inner top seal panel at a predetermined position, The upper side fold line at the boundary between the pair of gable roof forming panels and the body panel is substantially parallel to the seal fold line. The paper container according to claim 4, wherein the paper container is inclined. A fourth auxiliary folding line having an upward curved shape that crosses the trunk panel and is connected to the trunk vertical folding line on both sides of the trunk panel or in the vicinity thereof is connected to the trunk panel that is connected to the end wall forming panel. The lower end of one auxiliary folding line is provided so that the tip of the curved projection touches the tip of the curved projection of the first auxiliary folding line or the vicinity thereof. A paper container as described in 1.

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