paper container

Abstract

To provide a paper container capable of increasing a volume immediately below an opening of a spout and storing a large amount of a liquid content directly below the opening of the spout.SOLUTION: In a gable roof type paper container A, a trunk part panel 5 is connected to a gable wall forming panel 21 on an opening side via a top transverse fold line 19, and is provided with a horizontal line across the trunk part panel 5. When assuming a straight virtual line 30A that connects to or near trunk part vertical folding lines 1 and 2 on both sides of the trunk part panel 5, a pair of second auxiliary fold lines 31 and 32 are provided extending from both ends of the virtual line 30A or the vicinity thereof. A top of a substantially isosceles triangle is located in contact with the top transverse fold line 19 or near the top transverse fold line 19.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a paper container.

Background Art

[0002] Conventionally, as a paper container for containing liquid contents such as milk and juice, a gable-top paper container has been widely used. This paper container is made of a paperboard material laminated with a thermoplastic resin on the front and back surfaces, has four body panels, and a square cylindrical body is formed by joining the edges with a vertical seal panel. At the upper end of the body panel, a pair of gable-top forming panels having an outer top seal panel on the upper part and facing each other, and a pair of gable wall forming panels having an inner top seal panel on the upper part and facing each other, with one of them serving as a pouring spout and being opened, are continuously provided. A pair of gable wall forming panels are folded between the pair of gable-top forming panels, and the outer top seal panel and the inner top seal panel are heated and sealed at a predetermined position to be sealed, thereby forming the top.

[0003] Opening of the pouring spout in such a conventional paper container is performed by peeling off the opposing surfaces of the outer top seal panel and the inner top seal panel that are heat-sealed on the side of the gable wall forming panel serving as the pouring spout, pulling out the gable wall forming panel folded between the pair of gable-top forming panels, and folding it outward from the top horizontal fold line at the boundary with the body panel continuously provided via the top horizontal fold line to open the pouring spout. In addition to this type of paper container, various paper containers have been proposed.

[0004] For example, in Patent Document 1, a pouring spout folding line is provided vertically from the center of the gable wall forming panel folded between the pair of gable-top forming panels to the side of the body panel continuously provided, the gable wall forming panel is pulled out from between the pair of gable-top forming panels, and the gable wall forming panel and the body panel are mountain-folded from the pouring spout folding line to form a pouring spout. A paper container has been proposed.

[0005] Furthermore, Patent Document 2 proposes a paper container in which a body panel is provided that extends from the center of a gable wall forming panel folded between a pair of gable roof forming panels, and a downward curved first auxiliary fold line is provided that crosses the body panel, and a pair of second auxiliary fold lines are provided that extend from both ends of the first auxiliary fold line toward the sealing side vertex of the substantially triangular face of the gable wall forming panel.In this paper container, the gable wall forming panel is pulled out from between the pair of gable roof forming panels, and the first By folding the auxiliary fold line in a valley fold and the second auxiliary fold line in a mountain fold, the roughly triangular surface of the body panel and end wall forming panel above the first auxiliary fold line is made to protrude in a boat-bottom shape, forming a spout. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Utility Model Publication No. 7-33820 [Patent Document 2] Patent No. 5234932 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] However, conventional technology has the following problems. First, in conventional paper containers that are widely used, the spout has a shape in which the roughly triangular surface of the end wall forming panel is tilted forward and protrudes. In this conventional paper container, the roughly triangular surface of the end wall forming panel located directly below the spout opening is tilted sharply from the top horizontal fold line to the center tip of the spout, creating a tray-like shape, which reduces the volume directly below the spout opening. Therefore, when pouring liquid contents or drinking directly from this conventional paper container, the tilt must be taken into account to prevent the liquid contents from spilling out easily.

[0008] Furthermore, in the paper container of Patent Document 1, the spout has a long, rhomboid shape in the vertical direction, and the fold lines for the spout tend to make the mountain fold angles of the end wall forming panel and the body panel deep (acute). In particular, if the body of the container is gripped tightly when dispensing, the end wall forming panel and the body panel will easily fold, and the mountain fold angles will become even deeper (acute). For this reason, it is difficult to increase the volume directly below the spout opening in the paper container of Patent Document 1, and it is difficult to store liquid contents directly below the spout opening.

[0009] Furthermore, the paper container described in Patent Document 2 was designed with the aim of increasing the area of ​​the spout opening, and as a result, the roughly triangular surface directly below the spout opening is inclined from the first auxiliary fold line provided in the middle of the body panel to the central tip of the spout. Therefore, the paper container of Patent Document 2 has a somewhat larger volume directly below the spout opening compared to conventional paper containers, and can store liquid contents to that extent. However, since the paper container of Patent Document 2 was not originally intended to increase the volume directly below the spout opening, the improvement in making the inclination of the roughly triangular surface directly below the spout opening closer to vertical is not sufficient (see Figure 7 of Patent Document 2, etc.). Therefore, the increase in volume directly below the spout opening of the paper container of Patent Document 2 is insufficient, and it is difficult to store a large amount of liquid contents in this area.

[0010] This invention has been made in view of the above problems, and aims to provide a paper container that can increase the volume directly below the opening of the spout, and can store a large amount of liquid contents directly below the opening of the spout. [Means for solving the problem]

[0011] One aspect of the present invention is a gable-roof type paper container made of a cardboard material with thermoplastic resin laminated on its front and back surfaces, comprising four body panels, the edges of which are joined by vertical sealing panels to form a rectangular cylindrical body, a pair of gable roof forming panels facing each other and having an outer top sealing panel on top, and a pair of gable wall forming panels facing each other and having an inner top sealing panel on top, with one of them serving as a spout for opening, connected to the upper end of the body panels, the pair of gable wall forming panels are folded between the pair of gable roof forming panels, and the top is formed when the outer top sealing panel and the inner top sealing panel are heated and sealed at a predetermined position, Assuming a straight, imaginary line that horizontally crosses the body panel, which is connected to the end wall forming panel on the opening side via a top horizontal fold line, and connects to or is near the vertical fold lines on both sides of the body panel, A pair of second auxiliary polylines are provided, each extending from either end of the aforementioned imaginary line or its vicinity toward the vertex of a roughly isosceles triangle with the imaginary line as its base. The pair of aforementioned second auxiliary fold lines extend to the vertices of the substantially isosceles triangle, The vertices of the aforementioned approximately isosceles triangle are tangent to or located near the transverse line of the vertex. And A third auxiliary fold line is provided in a V-shape on each extension of the pair of second auxiliary fold lines that extend beyond the vertex of the aforementioned approximately isosceles triangle. , It's in a paper container. [Effects of the Invention]

[0012] The above-described paper container has the above-described configuration. Therefore, when opening the spout of the paper container, the gable wall forming panel on the opening side, which is folded between a pair of gable roof forming panels, is pulled out, and force is applied so as to sandwich the body panels on both sides of the body panel connected to the gable wall forming panel on the opening side, causing a pair of second auxiliary fold lines to fold into mountain folds, and a roughly isosceles triangular region with the imaginary line as the base and the pair of second auxiliary fold lines as the remaining two sides to protrude forward, completing the spout. As a result, the inclination of the roughly triangular surface of the gable wall forming panel located directly below the opening of the spout is positioned on the line connecting the vertex of the roughly isosceles triangular region that protrudes forward and the central tip of the spout in a side view, thus effectively rising vertically. At this time, since the vertex of the roughly isosceles triangle is tangent to or near the transverse fold line of the vertex, the roughly isosceles triangular region that protrudes forward when the spout opening is formed is mainly formed within the body panel on the opening side. Therefore, the above-mentioned paper container can effectively raise the inclination of the approximately triangular surface of the end wall forming panel located directly below the spout opening in a vertical direction. Thus, the above-mentioned paper container can increase the volume directly below the spout opening and store a large amount of liquid contents directly below the spout opening. In addition, the above-mentioned paper container can be easily used to drink liquid contents, for example, by putting the mouth directly to the spout opening, just like a cup.

[0013] Preferably, the paper container described above can be configured such that the vertex of the approximately isosceles triangle is tangent to the transverse fold line at the top or is located within the body panel and near the transverse fold line at the top. With this configuration, the approximately isosceles triangular region that protrudes forward when the spout opening is formed is reliably formed within the body panel on the opening side, so that the inclination of the approximately triangular surface of the end wall forming panel located directly below the spout opening can be raised more effectively in the vertical direction. Furthermore, with this configuration, the approximately isosceles triangular region formed within the body panel does not cross other fold lines, so a stable approximately isosceles triangular shape can be maintained. Therefore, with this configuration, even if the body panels on both sides of the body panel where the approximately isosceles triangular region is formed are strongly squeezed when dispensing or drinking the liquid contents, the approximately isosceles triangular region does not easily bend, and the liquid contents can be dispensed or drunk while the shape of the spout is stable.

[0014] above In a paper container, if a pair of second auxiliary fold lines extend to the vertices of an approximately isosceles triangle, then an intersection point formed by the intersecting pair of second auxiliary fold lines actually exists, and this point forms the vertices of an approximately isosceles triangle. In this case, the above-mentioned effect can be made more certain.

[0015] The above-mentioned paper container can be configured such that a body panel is connected to the end wall forming panel on the opening side via a top horizontal fold line, and a straight first auxiliary fold line is provided that horizontally crosses this body panel and connects to or near the vertical fold lines on both sides of this body panel. With this configuration, when the aforementioned force is applied when forming the opening of the spout, the first auxiliary fold line, which is positioned to coincide with the imaginary line, folds into a valley when the pair of second auxiliary fold lines make a mountain fold. As a result, a roughly isosceles triangular region with the first auxiliary fold line as the base and the pair of second auxiliary fold lines as the remaining two sides is clearly formed and protrudes forward, completing the spout. Therefore, with this configuration, in addition to the effects described above, the external shape of the spout is superior.

[0016] The above paper container , theIt is preferable to provide a third auxiliary fold line. Specifically, the third auxiliary fold line can be provided in a V-shape on each extension of the pair of second auxiliary fold lines that extend beyond the vertex of the approximately isosceles triangle. With this configuration, when the aforementioned force is applied when forming the opening of the spout, the third auxiliary fold line bends in a V-shape, distributing the load concentrated at the vertex of the approximately isosceles triangle region in a fan shape. Therefore, when a third auxiliary fold line is present, it is possible to prevent a mountain bend on the line connecting the vertex of the approximately isosceles triangle region that protrudes forward and the central tip of the spout, and to maintain a wide opening for the spout.

[0017] The third auxiliary fold line described above is preferably provided within the approximately triangular plane of the gable wall forming panel. In this case, the vertex fold line does not cross the third auxiliary fold line, making it easier to distribute the load concentrated at the vertex of the approximately isosceles triangular region. Furthermore, if the vertex of the approximately isosceles triangular region that protrudes forward is tangent to or near the vertex fold line, it is preferable that the base end (the end on the vertex fold line side) of the V-shaped third auxiliary fold line is tangent to or near the vertex fold line. In this case, there is an excellent balance between the load distribution effect due to the vertex fold line not crossing the V-shaped third auxiliary fold line and the volume increase effect directly below the opening of the spout. In addition, the third auxiliary fold line described above can be configured, for example, to be tangent to the diagonal fold line of the gable wall forming panel, or to have a length of 30% or more of the distance to the diagonal fold line of the gable wall forming panel.

[0018] The above-mentioned paper container can be configured such that the upper edge of the inner top seal panel, formed on the upper part of the end wall forming panel on the opening side, gradually slopes downward from both ends of the inner top seal panel towards the center. With this configuration, the upper edge of the inner top seal panel becomes inverted "V" shape, so when the outer top seal panel and the inner top seal panel are bonded together, the bonding area at the center of the inner top seal panel (the point that becomes the center tip of the spout) where it is sandwiched and bonded at the deepest point is the smallest. Therefore, with this configuration, the spout can be effectively peeled off.

[0019] The above paper container can have, for example, the lateral width of the body panel be 70 mm or less. The lateral width of the body panel can preferably be 60 mm or less, more preferably 58 mm or less, and even more preferably 57 mm or less. In this case, while obtaining the above-described effects, a relatively small paper container can be obtained. Note that the lateral width of the body panel can be, for example, 40 mm or more.

Brief Description of the Drawings

[0020] [Figure 1] FIG. 1 is a perspective view showing the paper container according to Embodiment 1 in an opened state. [Figure 2] FIG. 2 is a side view of the paper container shown in FIG. 1. [Figure 3] FIG. 3 is a developed view showing the carton blank before the assembly process of the paper container shown in FIG. 1. [Figure 4] FIG. 4 is a front view of the paper container shown in FIG. 1 in a state before opening, as seen from the opening side. [Figure 5] FIG. 5 is a developed view showing the carton blank before the assembly process of the paper container according to Embodiment 2. [Figure 6] FIG. 6 is a side view of the paper container shown in FIG. 5. [Figure 7] FIG. 7 is an explanatory view showing a part of the carton blank before the assembly process of the paper container according to Embodiment 3. [Figure 8] FIG. 8 is an explanatory view showing a part of the carton blank before the assembly process of the paper container according to Embodiment 4. [Figure 9] FIG. 9 is an explanatory view showing a part of the carton blank before the assembly process of the paper container according to Embodiment 5. [Figure 10] FIG. 10 is an explanatory view showing a part of the carton blank before the assembly process of the paper container according to Embodiment 6. [Figure 11] FIG. 11 is an explanatory view showing a part of the carton blank before the assembly process of the paper container according to Embodiment 7.

Modes for Carrying Out the Invention

[0021] The paper container described herein will be explained in detail with reference to the drawings. Book The disclosed paper containers are not limited to the paper containers of the embodiments illustrated below. Note that the paper containers in Embodiments 3, 4, and 7 shown below are reference forms of paper containers.

[0022] (Embodiment 1) The paper container of Embodiment 1 will be described with reference to Figures 1 to 4.

[0023] As illustrated in Figures 1 to 4, the paper container A of this embodiment is made of a cardboard material with thermoplastic resin laminated on its front and back surfaces, and comprises four body panels 4, 5, 6, and 7 via vertical body fold lines 1, 2, and 3, and the edges are joined by a vertical sealing panel 9 connected to the body panel 4 via a sealing vertical fold line 8 to form a rectangular cylindrical body 10.

[0024] A pair of gable roof forming panels 13 and 14 are connected to the upper ends of opposing body panels 4 and 6 of the cylindrical body 10 via top horizontal fold lines 11 and 12, facing each other. Outer top seal panels 17 and 18 are connected to the upper parts of this pair of gable roof forming panels 13 and 14 via seal horizontal fold lines 15 and 16. In addition, a pair of gable wall forming panels 21 and 22 are connected to the upper ends of other opposing body panels 5 and 7 of the cylindrical body 10 via top horizontal fold lines 19 and 20, facing each other, with one end forming a spout 46 that can be opened. Inner top seal panels 25 and 26 are connected to the upper parts of this pair of gable wall forming panels 21 and 22 via seal horizontal fold lines 23 and 24.

[0025] Furthermore, the pair of gable wall forming panels 21 and 22 are provided with fold lines 27 and 28 that connect from both ends of the top horizontal fold lines 19 and 20 at the boundary with the body panels 5 and 7 to the center of the sealing horizontal fold lines 23 and 24 at the boundary with the inner top seal panels 25 and 26. The pair of gable wall forming panels 21 and 22 are folded along the fold lines 27 and 28 and folded between the pair of gable roof forming panels 13 and 14, and the outer top seal panels 17 and 18 and the inner top seal panels 25 and 26 are heated and sealed in place, thereby forming the top 29 of the gable roof.

[0026] The body panel 5, which is connected to the end wall forming panel 21 on the opening side via a top horizontal fold line 19, is provided with a straight first auxiliary fold line 30 that horizontally traverses the body panel 5 and connects to or is near the body vertical fold lines 1 and 2 on both sides of the body panel 5. In this paper container A, a straight imaginary line 30A is assumed to be a linear imaginary line 30A that horizontally traverses the body panel 5, which is connected to the end wall forming panel 21 on the opening side via a top horizontal fold line 19, and connects to or is near the body vertical fold lines 1 and 2 on both sides of the body panel 5. In this embodiment, the first auxiliary fold line 30 actually provided on the body panel 5 coincides with the imaginary line 30A, and the first auxiliary fold line 30 can play the role of the imaginary line 30A. The position in which the first auxiliary fold line 30 is provided on the body panel 5 is not particularly limited. Figures 1 to 4 show an example in which the first auxiliary fold line 30 is provided at a position corresponding to the vertical width of the gable wall forming panel 21, down from the top horizontal fold line 19.

[0027] The body panel 5, which is connected to the gable wall forming panel 21 on the opening side via a top horizontal fold line 19, is provided with a pair of second auxiliary fold lines 31 and 32 that extend from both ends of the first auxiliary fold line 30 (virtual line 30A) or its vicinity toward the vertex of a roughly isosceles triangle with the first auxiliary fold line 30 (virtual line 30A) as the base. Note that an isosceles triangle generally includes an equilateral triangle. This embodiment illustrates a case where the length of the base and the lengths of the other two sides of a roughly isosceles triangle are not the same, as can be seen from Figure 3 and the like. The vertex of the roughly isosceles triangle with the first auxiliary fold line 30 (virtual line 30A) as the base is tangent to or near the top horizontal fold line 19. Therefore, the vertex of the roughly isosceles triangle is the point of the roughly triangular face 21a of the gable wall forming panel 21 on the opening side, excluding the vertex on the sealing side. Figures 1 to 4 specifically show an example where the vertex of the approximately isosceles triangle described above is tangent to the vertex transverse fold line 19. In Figures 1 to 4, the second auxiliary fold lines 31 and 32 are straight lines that converge to a single point in the widthwise center of the vertex transverse fold line 19, rather than extending toward the sealing-side vertex of the approximately triangular face 21a of the end wall forming panel 21. Furthermore, the second auxiliary fold lines 31 and 32 extend to the vertex of the approximately isosceles triangle. In this embodiment, the approximately isosceles triangular region 5a formed by the first auxiliary fold line 30 (virtual line 30A) and the second auxiliary fold lines 31 and 32 provided as described above within the opening-side body panel 5 is the part that protrudes forward when the opening of the spout 46 is formed.

[0028] In the paper container A of this embodiment, in addition to the pair of second auxiliary fold lines 31 and 32 described above, a third auxiliary fold line 33 is provided in a V-shape on each extension of the pair of second auxiliary fold lines 31 and 32 that extend beyond the vertex of a roughly isosceles triangle with the first auxiliary fold line 30 (imaginary line 30A) as the base. Figures 1 to 4 show an example in which the entire third auxiliary fold line 33 is provided within the gable wall forming panel 21. Note that even when the base end of the V-shaped third auxiliary fold line 33 touches the top transverse fold line 19, this is also included in the configuration provided within the gable wall forming panel 21. Furthermore, Figures 1 to 4 show an example in which the third auxiliary fold line 33 has a length of 30% or more of the distance from the base end of the V-shaped third auxiliary fold line 33 to the diagonal fold line of the gable wall forming panel 21. In this case, the length of the third auxiliary fold line 33 can be preferably 35% or more, more preferably 40% or more, and preferably 80% or less, more preferably 70% or less, and more preferably 60% or less, of the distance to the diagonal fold line of the gable wall forming panel 21. Although not shown in the figures, the third auxiliary fold line 33 may be configured to be in contact with the diagonal fold line of the gable wall forming panel 21.

[0029] In paper container A, the upper edge of the inner top seal panel 25, which is formed on the upper part of the end wall forming panel 21 on the opening side, gradually slopes downward from both ends of the inner top seal panel 25 towards the center. Therefore, the upper edge of the inner top seal panel 25 is shaped like an inverted "V".

[0030] Furthermore, a pair of inner panels 37 and 38 are connected to the lower ends of opposing body panels 4 and 6 of the cylindrical body 10 via bottom horizontal fold lines 35 and 36, and a pair of outer panels 41 and 42 are connected to the lower ends of other opposing body panels 5 and 7 of the cylindrical body 10 via bottom horizontal fold lines 39 and 40. The bottom 43 is formed by folding the pair of inner panels 37 and 38 between the pair of outer panels 41 and 42, heating and sealing them.

[0031] In the paper container A of this embodiment, configured as described above, when opening the spout 46, the opening-side gable wall forming panel 21, which is folded between the pair of gable roof forming panels 13 and 14, is pulled out, and force is applied to sandwich the body panels 4 and 6 on both sides of the body panel 5 connected to the opening-side gable wall forming panel 21. As a result, the pair of second auxiliary fold lines 31 and 32 make a mountain fold, and the first auxiliary fold line 30, which is positioned to coincide with the imaginary line 30A, makes a valley fold. This causes a roughly isosceles triangular region 5a, with the first auxiliary fold line 30 (imaginary line 30A) as the base and the pair of second auxiliary fold lines 31 and 32 as the remaining two sides, to protrude forward, completing the spout 46. Consequently, the inclination 44 of the roughly triangular surface 21a of the gable wall forming panel 21 located directly below the opening of the spout 46 is positioned on the line connecting the vertex of the roughly isosceles triangular region 5a that protrudes forward and the central tip 25a of the spout in a side view, thus effectively rising vertically. In this case, since the vertices of the approximately isosceles triangle are tangent to or near the transverse fold line 19 at the top, the approximately isosceles triangular region 5a that protrudes forward when the opening of the spout 46 is formed is mainly formed within the body panel 5 on the opening side. As a result, the paper container A can effectively raise the inclination of the approximately triangular surface 21a of the end wall forming panel 21 located directly below the opening of the spout 46 in a vertical direction. Thus, the paper container A can increase the volume directly below the opening of the spout 46 and can store a large amount of liquid contents directly below the opening of the spout 46. Furthermore, the paper container A can be easily used like a cup, for example, when drinking liquid contents by directly putting one's mouth to the opening of the spout 46.

[0032] Furthermore, in paper container A, the vertices of the approximately isosceles triangle are in contact with the transverse fold line 19 at the top. Therefore, with paper container A, the approximately isosceles triangular region 5a that protrudes forward when the opening of the spout 46 is formed is reliably formed within the body panel 5 on the opening side, so that the inclination of the approximately triangular surface 21a of the end wall forming panel 21 located directly below the opening of the spout 46 can be made to rise more effectively in the vertical direction. In addition, with paper container A, the approximately isosceles triangular region 5a formed within the body panel 5 does not cross other fold lines, so a stable approximately isosceles triangular shape can be maintained. For this reason, with paper container A, even if the body panels 4 and 6 on both sides of the body panel 5 where the approximately isosceles triangular region 5a is formed are strongly squeezed when dispensing or drinking the liquid contents, the approximately isosceles triangular region 5a does not easily bend, and the liquid contents can be dispensed or drunk while the shape of the spout 46 is stable.

[0033] Furthermore, since paper container A has a first auxiliary fold line 30 positioned to coincide with the imaginary line 30A, when the aforementioned force is applied when forming the opening of the spout 46, the first auxiliary fold line 30 folds into a valley fold when the pair of second auxiliary fold lines 31 and 32 fold into mountain folds. As a result, a roughly isosceles triangular region 5a is clearly formed with the first auxiliary fold line 30 as the base and the pair of second auxiliary fold lines 31 and 32 as the remaining two sides, and the spout 46 protrudes forward in this state, completing the spout 46. Therefore, in addition to the effects described above, paper container A has superior external shape for the spout 46.

[0034] Furthermore, in paper container A, a third auxiliary fold line 33 is provided in a V-shape on the extensions of a pair of second auxiliary fold lines 31 and 32 that extend beyond the vertex of a roughly isosceles triangle with the first auxiliary fold line 30 (imaginary line 30A) as the base. According to paper container A, when the aforementioned force is applied when forming the opening of the spout 46, the third auxiliary fold line 33 folds in a V-shape, distributing the load concentrated at the vertex of the roughly isosceles triangle region 5a in a fan shape. Therefore, according to paper container A, it is possible to prevent a mountain fold on the line connecting the vertex of the roughly isosceles triangle region 5a that protrudes forward and the central tip 25a of the spout, and to maintain a wide opening for the spout 46.

[0035] Furthermore, since the third auxiliary fold line 33 is provided within the roughly triangular surface 21a of the end wall forming panel 21 of the paper container A, the top horizontal fold line 19 does not cross the third auxiliary fold line 33, making it easier to distribute the load that would otherwise be concentrated at the vertex of the roughly isosceles triangular region 5a.

[0036] Furthermore, in paper container A, the upper edge of the inner top seal panel 25, which is formed on the upper part of the end wall forming panel 21 on the opening side, gradually slopes downward from both ends of the inner top seal panel 25 towards the center. With paper container A, the upper edge of the inner top seal panel 25 is in the shape of an inverted "V", so when the outer top seal panels 17, 18 and the inner top seal panels 25, 26 are bonded together, the bonding area at the central part of the inner top seal panel 25 (the part that becomes the central tip 25a of the spout), which is sandwiched and bonded at the deepest point, is the smallest. Therefore, with paper container A, the spout 46 can be effectively peeled off.

[0037] Furthermore, the width of the body panels 4, 5, 6, and 7 of paper container A is specified to be 70 mm or less, and more specifically, 58 mm or less. Therefore, although paper container A is relatively small, it can achieve the effects described above.

[0038] (Embodiment 2) The paper container of Embodiment 2 will be described with reference to Figures 5 and 6. Note that, among the reference numerals used in Embodiment 2 and later, those that are the same as those used in the previously described embodiments represent the same components as those in the previously described embodiments, unless otherwise specified.

[0039] As illustrated in Figures 5 and 6, in the paper container A of this embodiment, the lengths of the first auxiliary fold line 30 and the second auxiliary fold lines 31 and 32 are equal. Therefore, in the paper container B of this embodiment, the approximately isosceles triangle formed by the first auxiliary fold line 30 (virtual line 30A) as the base and the pair of second auxiliary fold lines 31 and 32 as the remaining two sides is approximately an equilateral triangle.

[0040] In this embodiment, the first auxiliary fold line 30 provided on the body panel 5 is located lower than that of the paper container A in Embodiment 1, specifically below the center of the vertical length of the body panel 5.

[0041] Other configurations and effects are the same as in Embodiment 1.

[0042] (Embodiment 3) The paper container of Embodiment 3 will be described with reference to Figure 7. As illustrated in Figure 7, the paper container A of this embodiment is similar to the paper container A of Embodiments 1 and 2 in that the vertices of a roughly isosceles triangle with the first auxiliary fold line 30 (virtual line 30A) as the base are located on the vertex horizontal fold line 19. However, in the paper container A of this embodiment, the second auxiliary fold lines 31 and 32 do not extend to the vertex of the roughly isosceles triangle. In other words, in the paper container A of this embodiment, the second auxiliary fold lines 31 and 32 do not intersect, and there is no actual intersection point of the second auxiliary fold lines 31 and 32. Specifically, the second auxiliary fold lines 31 and 32 are not connected to the vertex horizontal fold line 19, and their upper ends are located in the vicinity of the vertex horizontal fold line 19.

[0043] The paper container A of this embodiment can also increase the volume directly below the opening of the spout 46, allowing it to store a larger amount of liquid contents directly below the opening of the spout 46. However, since the paper container A of this embodiment does not have a third auxiliary fold line 33, the effect of preventing mountain folds on the line connecting the vertex of the roughly isosceles triangular region 5a that protrudes forward and the central tip of the spout is smaller compared to embodiments 1 and 2. The other configurations and effects are the same as those of embodiments 1 and 2.

[0044] (Embodiment 4) The paper container of Embodiment 4 will be described with reference to Figure 8. As illustrated in Figure 8, in this embodiment, the paper container A does not have the second auxiliary fold lines 31, 32 and the third auxiliary fold line 33 extending to the vertex of the approximately isosceles triangle described above, and the second auxiliary fold lines 31, 32 and the third auxiliary fold line 33 are not connected. Specifically, the paper container A is the same as the paper container A of Embodiments 1 and 2 in that the vertex of the approximately isosceles triangle with the first auxiliary fold line 30 (imaginary line 30A) as the base is located on the vertex horizontal fold line 19. However, in this embodiment, the second auxiliary fold lines 31 and 32 do not extend to the vertex of the approximately isosceles triangle. Also, the third auxiliary fold line 33 is composed of two diagonal lines spaced apart from each other so as not to intersect at the V-shaped base. Furthermore, one of the diagonal lines of the third auxiliary fold line 33, which lies on the extension of the second auxiliary fold line 31, does not extend to the vertex of the approximately isosceles triangle and is not connected to the second auxiliary fold line 31. Similarly, the other diagonal line of the third auxiliary fold line 33, which lies on the extension of the second auxiliary fold line 32, also does not extend to the vertex of the approximately isosceles triangle and is not connected to the second auxiliary fold line 32. In other words, in the paper container A of this embodiment, the second auxiliary fold lines 31, 32 and the third auxiliary fold line 33 do not intersect, and the intersection point of the second auxiliary fold lines 31, 32 and the intersection point of the two diagonal lines of the third auxiliary fold line 33 do not actually exist. Specifically, the second auxiliary fold lines 31 and 32 do not connect to the top horizontal fold line 19, and their upper ends are located in the vicinity of the top horizontal fold line 19. Furthermore, the two diagonal lines of the third auxiliary fold line 33 are not connected to the top horizontal fold line 19, and their lower ends are located near the top horizontal fold line 19.

[0045] The paper container A of this embodiment can also increase the volume directly below the opening of the spout 46, allowing it to store a larger amount of liquid contents directly below the opening of the spout 46. However, since the paper container A of this embodiment does not have the intersection of the second auxiliary fold lines 31, 32 and the third auxiliary fold line 33, the effect of distributing the load concentrated at the vertex of the roughly isosceles triangular region 5a that protrudes forward in a fan shape is smaller compared to embodiments 1 and 2. The other configurations and effects are the same as those of embodiments 1 and 2.

[0046] (Embodiment 5) The paper container of Embodiment 5 will be described with reference to Figure 9. As illustrated in Figure 9, in the paper container A of this embodiment, the vertex of the approximately isosceles triangle with the first auxiliary fold line 30 (imaginary line 30A) as the base does not touch the vertex horizontal fold line 19. Specifically, in the paper container A of this embodiment, the vertex of the approximately isosceles triangle is located within the body panel 5 and in the vicinity of the vertex horizontal fold line 19.

[0047] The paper container A of this embodiment also allows for an increase in the volume directly below the opening of the spout 46, enabling the storage of a larger amount of liquid contents directly below the opening of the spout 46. However, in the paper container A of this embodiment, the top horizontal fold line 19 crosses the third auxiliary fold line 33, so the effect of distributing the load concentrated at the vertex of the approximately isosceles triangle region 5a in a fan shape is smaller compared to embodiments 1 and 2. The other configurations and effects are the same as in embodiments 1 and 2.

[0048] (Embodiment 6) The paper container of Embodiment 6 will be described with reference to Figure 10. As illustrated in Figure 10, in the paper container A of this embodiment, the vertices of the substantially isosceles triangle with the first auxiliary fold line 30 (imaginary line 30A) as the base are not touching the vertex transverse fold line 19. Specifically, in the paper container A of this embodiment, the vertices of the substantially isosceles triangle are located within the substantially triangular plane 21a and in the vicinity of the vertex transverse fold line 19.

[0049] The paper container A of this embodiment also allows for an increase in the volume directly below the opening of the spout 46, enabling it to store a larger amount of liquid contents directly below the opening of the spout 46. However, in the paper container A of this embodiment, the vertex of the approximately isosceles triangle is closer to the seal side vertex compared to embodiments 1 and 2, resulting in a smaller volume directly below the opening of the spout 46. The other configurations and effects are the same as those of embodiments 1 and 2.

[0050] (Embodiment 7) The paper container of Embodiment 7 will be described with reference to Figure 11. As illustrated in Figure 11, in the paper container A of this embodiment, the vertices of the approximately isosceles triangle with the first auxiliary fold line 30 (virtual line 30A) as the base do not touch the vertex horizontal fold line 19. Specifically, in the paper container A of this embodiment, the vertices of the approximately isosceles triangle are located within the approximately triangular plane 21a and in the vicinity of the vertex horizontal fold line 19. In the paper container A of this embodiment, the upper ends of the pair of second auxiliary fold lines 31 and 32 are connected to the vertex horizontal fold line 19, but since the pair of second auxiliary fold lines 31 and 32 do not intersect, there is no actual intersection point formed by the intersection of the pair of second auxiliary fold lines.

[0051] Furthermore, the third auxiliary fold line 33 is composed of two diagonal lines spaced apart from each other so as not to intersect at the V-shaped base. Figure 11 shows an example where one diagonal line constituting the third auxiliary fold line 33 is connected to one of the second auxiliary fold lines 31 on the same side via the vertex horizontal fold line 19, and the other diagonal line constituting the third auxiliary fold line 33 is connected to the other second auxiliary fold line 32 on the same side via the vertex horizontal fold line 19. Thus, in this embodiment, the third auxiliary fold line 33 is provided in a position offset from the extensions of the pair of second auxiliary fold lines 31 and 32 that extend beyond the vertex of a roughly isosceles triangle with the first auxiliary fold line 30 (virtual line 30A) as the base.

[0052] The paper container A of this embodiment can also increase the volume directly below the opening of the spout 46, allowing it to store a larger amount of liquid contents directly below the opening of the spout 46. However, in the paper container A of this embodiment, a third auxiliary fold line 33 is not provided in a V-shape on the extensions of the pair of second auxiliary fold lines 31 and 32 that extend beyond the vertex of the approximately isosceles triangle. Therefore, compared to embodiments 1 and 2, the effect of preventing mountain folds on the line connecting the vertex of the approximately isosceles triangle region 5a that protrudes forward and the central tip of the spout is smaller. Other configurations and effects are the same as in embodiments 1 and 2.

[0053] The present invention is not limited to the embodiments described above, and various modifications are possible without departing from the spirit of the invention.

[0054] For example, in embodiments 1 to 7, an example was shown in which a straight first auxiliary fold line 30 is provided on a body panel 5 connected to the gable wall forming panel 21 on the opening side via a top horizontal fold line 19, and which horizontally crosses the body panel 5 and connects to or is near the body vertical fold lines 1 and 2 on both sides of the body panel 5. Instead of this configuration, for example, a downward curved first auxiliary fold line 30 may be provided on a body panel 5 connected to the gable wall forming panel 21 on the opening side via a top horizontal fold line 19, and which horizontally crosses the body panel 5 and connects to or is near the body vertical fold lines 1 and 2 on both sides of the body panel 5. In this case, the downward curved first auxiliary fold line 30 does not coincide with the virtual line 30A described above.

[0055] Alternatively, the body panel 5, which is connected to the end wall forming panel 21 on the opening side via a top horizontal fold line 19, can be configured without the first auxiliary fold line 30. With this configuration, when the aforementioned force is applied when forming the opening of the spout 46, the lower ends of the pair of second auxiliary fold lines 31 and 32 will bend slightly, or the body panel 5 located in the lower part of the approximately isosceles triangular region 5a will bulge out smoothly, connecting to the approximately isosceles triangular region 5a that protrudes forward. Therefore, even with this configuration, there is no change in the fact that the volume directly below the opening of the spout 46 can be increased, and a large amount of liquid content can be stored directly below the opening of the spout 46. [Explanation of symbols]

[0056] A paper container 4, 5, 6, 7 Torso panels 9. Vertical sealing panel 10. Cylindrical body 17, 18 Outer top seal panel 13, 14 Gable roof forming panels 25, 26 Inner top seal panel 46 spout 21, 22 End wall forming panel 29 Top 19, 20 Top horizontal fold line 1, 2 Vertical fold lines on the torso 30A virtual line 31, 32 Second Subsidy Line

Claims

1. A gable roof-shaped paper container is made of a cardboard material with thermoplastic resin laminated on its front and back surfaces, comprising four body panels, the edges of which are joined by vertical sealing panels to form a rectangular cylindrical body, a pair of gable roof forming panels facing each other and having an outer top sealing panel on top, and a pair of gable wall forming panels facing each other and having an inner top sealing panel on top, with one of them serving as a spout for opening, are connected to the upper end of the body panels, the pair of gable wall forming panels are folded between the pair of gable roof forming panels, and the top is formed when the outer top sealing panel and the inner top sealing panel are heated and sealed at a predetermined position, Assuming a straight, imaginary line that horizontally crosses the body panel, which is connected to the end wall forming panel on the opening side via a top horizontal fold line, and connects to or is near the vertical fold lines on both sides of the body panel, A pair of second auxiliary polylines are provided, each extending from either end of the aforementioned imaginary line or its vicinity toward the vertices of a roughly isosceles triangle with the imaginary line as its base. The pair of the aforementioned second auxiliary fold lines extend to the vertices of the substantially isosceles triangle, The vertices of the aforementioned approximately isosceles triangle are tangent to or near the transverse line of the vertex, A third auxiliary fold line is provided in a V-shape on each extension of the pair of second auxiliary fold lines that extend beyond the vertex of the aforementioned approximately isosceles triangle. Paper container.

2. The body panel, which is connected to the end wall forming panel on the opening side via the top horizontal fold line, is provided with a straight first auxiliary fold line that horizontally crosses the body panel and connects to or is near the body vertical fold lines on both sides of the body panel. The paper container according to claim 1.

3. The third auxiliary fold line is provided within the gable wall forming panel. A paper container according to claim 1 or claim 2.

4. The upper edge of the inner top seal panel, which is formed on the upper part of the end wall forming panel on the opening side, gradually slopes downward from both ends of the inner top seal panel towards the center. A paper container according to any one of claims 1 to 3.

5. The width of the aforementioned body panel is 70 mm or less. A paper container according to any one of claims 1 to 4.

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