Paper container

Abstract

In this paper container of a garble roof type, a body panel 7 that has contiguously provided thereto one gable wall formation panel 22, which is to serve as a spout 27 and is to be opened, among four body panels 6, 7, 8, 9, is defined as a body front panel 45. Two first folding creases 47, 48 are formed in a body back panel 46, which is a body panel 9 having contiguously provided thereto the other gable wall formation panel 23, so as to be connected to two base points P1, P2 that are set in the vertical direction along each of right and left body vertical folding creases 5, 10 of the body back panel 46 on or near the right and left body vertical folding creases 5, 10, and so as to expand inward in the lateral width direction of the body back panel 46. Slip prevention ruled lines 51, 52 that extend in the vertical direction are formed widthwise in the body left side panel 49 and the body right side panel 50.

Description

Paper containers

[0001] The present invention relates to a paper container for containing liquid contents.

[0002] Conventionally, as a paper container for storing liquid contents such as milk, juice, alcohol, etc., a gable roof-type paper container has been widely used, which is made of a paperboard material with a thermoplastic resin laminated on the front and back surfaces, has four body panels connected together via vertical fold lines in the body, and the edges are joined by vertical seal panels to form a rectangular body, and at the upper ends of the body panels are connected a pair of gable roof-forming panels facing each other and having an outer top seal panel at their upper parts, and a pair of gable wall-forming panels facing each other and having an inner top seal panel at their upper parts, one of which serves as a spout that can be opened, 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 top seal panel are heated and sealed at predetermined positions to form a hermetic top (see, for example, Patent Document 1).

[0003] When pouring liquid contents from such a gable roof type paper container, the body is generally grasped with fingers from the back panel side by grasping the right and left side panels, with the body panel located on the side of the pouring outlet formed at the top of the four body panels being the front panel.

[0004] In addition, the spout of such a gable roof-shaped paper container is opened by peeling away the heat-sealed opposing surfaces of the outer top seal panel and the inner top seal panel on the side of the gable wall forming panel that forms the spout, pulling out the gable wall forming panel that is folded between the pair of gable roof forming panels, and folding it back outward from the top horizontal fold line at the boundary with the body panel that is connected via the top horizontal fold line to open the spout.

[0005] Japanese Patent Application Laid-Open No. 2002-234524

[0006] However, in the case of the above-mentioned paper container, when the body is gripped to pour out the liquid contents, the body is gripped by pinching the right and left side panels with the fingers from the rear panel side as described above, and therefore the amount of finger pressure on the right and left side panels when gripping them with the fingers is affected by the width of the rear panel of the body. For example, when the rear panel of the body is particularly wide, i.e., in the case of a paper container with a large capacity and a thick body, the amount of finger pressure on the right and left side panels is small, requiring strong force from the fingertips, and there is a problem that the gripping force when gripping is insufficient and it may be difficult to grip, especially for people with relatively short fingers or weak strength, such as women and children.

[0007] Furthermore, in the above-mentioned paper container, the spout formed by pulling out the gable wall forming panel that is folded between a pair of gable roof forming panels has a diamond shape that is long in the horizontal direction, and the opening area of ​​the spout is small. In addition, when poured, the liquid contents flow out in a spread-out state, making it difficult to pour.

[0008] The object of the present invention is to provide a paper container that allows a liquid content to be securely gripped and poured even when the paper container has a large capacity and a thick body, and that has a spout that opens wide vertically when pouring the liquid content, making it easy to pour the liquid content.

[0009] In order to achieve the above object, the invention described in claim 1 provides a container made of a paperboard material having a thermoplastic resin laminated on both sides thereof, the container comprising four body panels connected together via body longitudinal fold lines, the edges of which are joined together by longitudinal seal panels to form a rectangular body, and a pair of gable roof forming panels facing each other and having an outer top seal panel at the top, and a pair of gable wall forming panels facing each other and having an inner top seal panel at the top, one of which serves as a pouring outlet and can be opened, connected together via a top horizontal fold line, the pair of gable roof forming panels being folded between the pair of gable roof forming panels, and the outer top seal panel and the inner top seal panel being heated at predetermined positions to seal the container. In a gable roof-shaped paper container in which the top is formed by sealing the container after being sealed, when one of the four body panels, which serves as the pouring outlet and is connected to the gable wall-forming panel, is designated as the body front panel, the body back panel, which is the body panel to which the other gable wall-forming panel is connected, has two first fold lines formed on or near the left and right body vertical fold lines of the body back panel, which connect to two base points set in the vertical direction along the left and right body vertical fold lines, and which bulge inward in the width direction of the body back panel, and further the left body side panel and the right body side panel have anti-slip lines formed in the horizontal direction.

[0010] According to the invention of claim 1, when the body panel to which one of the gable wall-forming panels, which serves as a pouring outlet and is opened, is connected is the body front panel, two first fold lines are formed on the body back panel, which is the body panel to which the other gable wall-forming panel is connected, on or near the left and right body vertical fold lines of the body back panel, connecting to two base points set in the up and down direction along the left and right body vertical fold lines, and bulging toward the inside in the width direction of the body back panel. Therefore, when pouring out liquid contents, the body can be pressed by grasping with fingers from the left and right at the intersections of the left and right body vertical fold lines of the body back panel and imaginary lines extending horizontally from the vertices of the first fold lines. As a result, the torso back panel is mountain-folded along the two first fold lines, and the torso back panel side of the torso is easily crushed and recessed at the virtual intersections of the left and right torso vertical fold lines of the torso back panel and virtual lines extending laterally from the vertices of the first fold lines. As a result, the left and right torso side panels also recess. In the torso, the torso back panel has a minimum width between the vertices of the two first fold lines and a concave portion that gradually widens in width toward the left and right torso vertical fold lines of the torso front panel. Therefore, by grasping the concave portion, a wide area can be placed on the left and right torso side panels, making it easy to grip the torso.

[0011] Furthermore, the concave surfaces of the left and right side panels of the body are inclined in a narrower width direction toward the back panel of the body, but the left and right side panels of the body have anti-slip lines extending vertically and laterally, so that fingers gripping the concave surfaces of the left and right side panels of the body will catch on the anti-slip lines, preventing the paper container from slipping off the fingers.

[0012] The invention described in claim 2 is characterized in that the first fold line according to claim 1 is formed in a substantially elliptical arc shape with the maximum bulging position as its apex.

[0013] According to the invention described in claim 2, the first fold line is formed in a substantially elliptical arc shape with the maximum bulge position as its apex, so that when the torso is pinched and pressed at the virtual intersection points between the left and right torso vertical fold lines of the torso back panel and virtual lines extending horizontally from the respective apexes of the first fold line, the back front panel can be easily mountain-folded from the two first fold lines.

[0014] The invention described in claim 3 is characterized in that the vertices of the first fold lines according to claim 1 or 2 are located at approximately the middle positions in the longitudinal direction of the body back panel.

[0015] According to the invention described in claim 3, the vertices of the first fold lines are located at approximately the middle position in the vertical direction of the back panel of the body, so that the concave portion is formed at approximately the middle position in the vertical direction of the body, allowing the paper container to be gripped in a stable state when pouring.

[0016] The invention described in claim 4 is a container made of a paperboard material with a thermoplastic resin laminated on both sides, and comprising four body panels connected together via vertical fold lines, the edges of which are joined by vertical seal panels to form a rectangular body, and a pair of gable roof forming panels facing each other and having an outer top seal panel at the top, and a pair of gable wall forming panels facing each other and having an inner top seal panel at the top, one of which serves as a pouring outlet and can be opened, connected together via a top horizontal fold line, the pair of gable roof forming panels being folded between the pair of gable roof forming panels, and the outer top seal panel and the inner top seal panel being heated and sealed at predetermined positions. In a gable roof-type paper container in which the top is formed by folding the gable wall forming panel, when the body panel to which one of the four body panels, which serves as the spout and is opened and is connected to the gable wall forming panel, is the body front panel, two fifth fold lines are formed on the body front panel, which are connected to two base points set at or near the upper and lower ends of the left and right body vertical fold lines of the body front panel and bulge toward the inside in the width direction of the body front panel, and further, sixth fold lines are formed which extend laterally from or near the vertices of the two fifth fold lines toward the left and right body vertical fold lines and straddle the left and right body vertical fold lines to reach parts of the left side panel and right side panel of the body.

[0017] According to the invention of claim 4, by peeling away the heat-sealed opposing surfaces of the outer top seal panel and the inner top seal panel on the gable wall forming panel side that forms the spout, and pulling out the gable wall forming panel folded between a pair of gable roof forming panels to open the spout, and then gripping and pressing the body portion with fingers from the left and right at the intersections of the left and right vertical fold lines of the body front panel and the second fold line, the body front panel side of the body portion is easily crushed at the intersections of the left and right vertical fold lines and the second fold line, thereby mountain-folding the body front panel from the two first fold lines, and the portion of the body front panel surrounded by the two first fold lines protrudes forward, thereby widening the spout vertically and opening widely, thereby facilitating the pouring of liquid contents.

[0018] The invention described in claim 5 is characterized in that the fifth fold line according to claim 4 is formed in a substantially elliptical arc shape with the maximum bulging position as its apex.

[0019] According to the invention described in claim 5, the fifth fold line is formed in a substantially elliptical arc shape with the maximum bulge position as its apex. Therefore, when the body is pressed so as to be pinched at the intersection of the left and right body vertical fold lines of the body front panel with the second fold line, the body front panel can be easily mountain-folded from the two fifth fold lines.

[0020] The invention described in claim 6 is characterized in that the torso back panel of the torso described in claim 4 or 5 has two seventh fold lines formed on or near the left and right torso vertical fold lines of the torso back panel, which connect to two base points set in the vertical direction along the left and right torso vertical fold lines, and bulge toward the inside in the width direction of the torso back panel, and the vertices of the seventh fold lines are located at approximately the same horizontal position as the vertices of the fifth fold lines.

[0021] According to the invention of claim 6, during pouring, the body is crushed by pinching the intersections of the left and right body vertical fold lines of the body front panel with the sixth fold line from the left and right sides with fingers, and then the intersections of the left and right body vertical fold lines of the body back panel with imaginary lines extending laterally from the vertices of the seventh fold line from the vertices of the seventh fold line are grasped with fingers from the left and right sides and pressed as if pinching. This causes the body back panel to be mountain-folded from the two seventh fold lines, and the body back panel side of the body is easily crushed from the imaginary intersections of the left and right body vertical fold lines of the body back panel with imaginary lines extending laterally from the vertices of the seventh fold line. As a result, the body has a continuously concave shape in the center from the body front panel through the body left side panel and right side panel to the body back panel, making it easy to grip the body by grasping the concave portion.

[0022] A seventh aspect of the present invention is the sixth aspect of the present invention, wherein the seventh fold line is formed in a substantially elliptical arc shape with the maximum bulging position as its apex.

[0023] According to the invention described in claim 7, the seventh fold line is formed in a substantially elliptical arc shape with the maximum bulge position as its apex. Therefore, when the torso is pinched and pressed at the virtual intersection points between the left and right torso vertical fold lines of the torso back panel and virtual lines extending horizontally from the respective apexes of the seventh fold line, the back front panel can be easily mountain-folded from the two seventh fold lines.

[0024] The invention described in claim 8 is characterized in that the left side panel and the right side panel of the torso section according to any one of claims 4 to 7 have a plurality of anti-slip creases formed on the tip side of the second fold line, extending in the vertical direction, toward the back panel of the torso section.

[0025] According to the invention described in claim 8, when pouring, the concave portions of the left and right side panels of the body are grasped, but the anti-slip lines formed on the left and right side panels of the body allow the grasping fingers to catch, effectively preventing the paper container from slipping off the fingers, making it easy to pour the liquid contents.

[0026] As described above, the paper container according to the present invention can provide a paper container that can be securely gripped and poured when pouring liquid contents, even if the paper container has a large capacity and a thick body. Also, a paper container can be provided that can ensure a spout that opens wide vertically when pouring liquid contents, making it easy to pour the liquid contents.

[0027] 1. is a perspective view from the rear side showing a first example of an embodiment of a paper container according to the present invention.

[0023] FIG. 1 is a front view of the paper container shown in FIG. 1.

[0024] FIG. 1 is a left side view of the paper container shown in FIG. 1.

[0025] FIG. 1 is a right side view of the paper container shown in FIG. 1.

[0026] FIG. 1 is a back view of the paper container shown in FIG. 1.

[0027] FIG. 1 is a plan view showing carton blanks for the paper container shown in FIG. 1.

[0028] FIG. 1 is a right side view of the paper container shown in FIG. 1 with the spout open.

[0029] FIG. 7 is an explanatory view showing the operation of crushing the rear panel side of the body part of the paper container shown in FIG. 7 from both sides.

[0030] FIG. 8 is a back view of the paper container after the rear panel side of the body part has been crushed from both sides by the operation shown in FIG. 8.

[0031] FIG. 9 is a right side view of the paper container shown in FIG. 9.

[0032] FIG. 10 is an explanatory view showing the state in which the body part of the paper container shown in FIG. 10 is gripped and held.

[0033] FIG. 11 is a perspective view showing a second example of an embodiment of a paper container according to the present invention.

[0034] FIG. 12 is a front view of the paper container shown in FIG. 12.

[0035] FIG. 13 is a left side view of the paper container shown in FIG. 12.

[0036] FIG. 14 is a back view of the paper container shown in FIG. 12.

[0037] FIG. 15 is a right side view of the paper container shown in FIG. 12.

[0038] FIG. 16 is a plan view showing carton blanks for the paper container shown in FIG. 22 is an explanatory diagram showing the operation of crushing the body front panel side of the body of the paper container shown in FIG. 12 with the spout open from both sides. FIG. 13 is a front view of a paper container where the body front panel side of the body has been crushed from both sides by the operation shown in FIG. 18. FIG. 14 is a side view of the paper container shown in FIG. 19. FIG. 25 is an explanatory diagram showing the operation of crushing the body back panel side of the body of the paper container shown in FIG. 19 from both sides. FIG. 26 is a rear view of a paper container where the body back panel side of the body has been crushed from both sides by the operation shown in FIG. 21. FIG. 27 is a side view of the paper container shown in FIG. 22. FIG. 28 is an explanatory diagram showing the state where the body of the paper container shown in FIG. 23 is gripped and held.

[0028]

[0014] Hereinafter, an embodiment of a paper container according to the present invention will be described in detail with reference to the drawings. Figures 1 to 11 show a first embodiment of the paper container according to the present invention. Figure 1 is a perspective view of the paper container of the first embodiment from the back side, Figure 2 is a front view of the paper container shown in Figure 1, Figure 3 is a left side view of the paper container shown in Figure 1, Figure 4 is a right side view of the paper container shown in Figure 1, Figure 5 is a back view of the paper container shown in Figure 1, Figure 6 is a plan view of a carton blank of the paper container shown in Figure 1, Figure 7 is a right side view of the paper container shown in Figure 1 with the spout opened, Figure 8 is an explanatory view showing the operation of crushing the back panel side of the body of the paper container shown in Figure 7 from both sides, Figure 9 is a back view of the paper container after the back panel side of the body of the body has been crushed from both sides by the operation shown in Figure 8, Figure 10 is a right side view of the paper container shown in Figure 9, and Figure 11 is an explanatory view showing the body of the paper container shown in Figure 10 being gripped.

[0029] The paper container 1 of the first example is formed from a carton blank 2, which is a paperboard material with a thermoplastic resin laminated on the front and back surfaces, as shown in Figure 6. The carton blank has four body panels 6, 7, 8, and 9 connected via body longitudinal fold lines 3, 4, and 5. When the paper container 1 is formed, the four body panels 6, 7, 8, and 9 are joined at the edge 12 of the body panel 6 to a vertical seal panel 11 connected to the body panel 9 via a body longitudinal fold line 10, thereby forming a square tubular body 13 of the paper container 1.

[0030] A pair of opposing gable roof forming panels 16, 17, each having outer top seal panels 14, 15 at their upper portions, are connected to the upper ends of the body panels 6, 8 via top horizontal fold lines 18, 19. A pair of opposing gable wall forming panels 22, 23, each having inner top seal panels 20, 21 at their upper portions, are connected to the upper ends of the body panels 7, 9 via top horizontal fold lines 24, 25. The gable wall forming panels 22, 23 are folded between the gable roof forming panels 16, 17, and the outer top seal panels 14, 15 and the inner top seal panels 20, 21 are heated and sealed at predetermined positions to form a top 26. One of the gable wall forming panels 22, 23 folded between the gable roof forming panels 16, 17 is then pulled out and opened to form a spout 27. In this example, the gable wall forming panel 22 is the gable wall forming panel on the opening side.

[0031] The gable roof forming panels 16, 17 are formed with guide creases 28, 29 on the opening side of the gable wall forming panel 22 to guide the folding of the gable roof forming panels 16, 17 when opened.

[0032] The gable wall forming panels 22, 23 are formed with folding lines 30, 31, 32, 33 for folding the gable wall forming panels 22, 23, and approximately triangular surface portions 34, 35 are formed surrounded by the folding lines 30, 31, 32, 33 and the top horizontal folding lines 24, 25.

[0033] In addition, bottom panels 38, 39 are connected to the lower ends of the body panels 7, 9 via bottom horizontal fold lines 36, 37, and inner panels 42, 43 are connected to the lower ends of the body panels 6, 8 via bottom horizontal fold lines 40, 41, and the inner panels 42, 43 are folded inside the bottom panels 38, 39 and sealed to form a bottom 44.

[0034] Furthermore, when the body panel 7 of the four body panels 6, 7, 8, 9 to which one of the gable wall forming panels 22 that becomes the pouring outlet 27 and is opened is connected, i.e., the body panel 7 located on the pouring outlet 27 side, is defined as the body front panel 45, two first fold lines 47, 48 are formed on the body back panel 46 (body panel 9) that are connected to two base points P1, P2 set in the vertical direction along the left and right body vertical fold lines 5, 10 on or near the left and right body vertical fold lines 5, 10 of the body back panel 46, and bulge toward the inside in the width direction of the body back panel 46.

[0035] The length between base point P1, which is the upper end of the first fold lines 47, 48 set in the vertical direction along the body vertical fold lines 5, 10, and base point P2, which is the lower end, is not particularly limited, but is preferably at least 1 / 5 to 1 / 3 of the length of the body vertical fold lines 5, 10. If the distance between base point P1 and base point P2, which is the lower end, is 1 / 5 or more of the length of the body vertical fold lines 5, 10, mountain folding from the first fold lines 47, 48 of the body back panel 46, as described below, can be easily performed. Furthermore, if the length exceeds 1 / 3, deformation of the body 13 becomes too great, which may make it difficult to grip the paper container 1.

[0036] In the first example, the first fold lines 47, 48 are formed in a generally elliptical arc shape with the vertex T1 at the maximum bulge position. The vertex T1 of each of the first fold lines 47, 48 is located approximately in the middle of the body back panel 47 in the vertical direction.

[0037] In the first example, the first fold lines 47, 48 are formed in a substantially elliptical arc shape, but are not limited to this as long as the shape has a vertex T1 at the maximum bulge position. For example, they may be V-shaped arcs or polygonal arcs, and may be divided discontinuous lines rather than continuous lines.

[0038] The horizontal dimension L1 from the trunk vertical fold lines 5, 10 to the apex T1 of the first fold lines 47, 48 is not particularly limited, and as will be described later, is appropriately set depending on the thickness of the trunk 13, i.e., the horizontal dimension L2 of the trunk back panel 46, so that during pouring, the virtual intersections Y1, Y2 between the virtual lines X1, X2 extending laterally from the apex T1 of each of the first fold lines 47, 48 on the left and right trunk vertical fold lines 5, 10 of the trunk back panel 46 are grasped with the fingers from the left and right and pinched and crushed, thereby depressing the trunk left side panel 49 (trunk panel 6) and the trunk right side panel 50 (trunk panel 8), making it easier to grip the trunk 13.

[0039] Furthermore, anti-slip creases 51, 52 extending vertically and laterally are formed on the left and right torso side panels 49, 50 of the torso 13. The anti-slip creases 51, 52 are arranged so as to be located in recessed portions of the left and right torso side panels 49, 50 when the left and right torso vertical fold creases 5, 10 of the torso back panel 46 are pinched with fingers from the left and right at imaginary intersections Y1, Y2 of the imaginary intersections Y1, Y2 with imaginary lines X1, X2 extending horizontally from vertices T1 of the first fold lines 47, 48, respectively. There are no particular limitations on the number, shape, or length of the anti-slip creases 51, 52.

[0040] In addition, in the first example, a downward arc-shaped second fold line 53 is formed on the front panel 45 of the body 13, with its end located at or near the upper end of the left and right vertical fold lines 3, 4 of the front panel 45 of the body 13.

[0041] A pair of spout-forming auxiliary fold lines 54, 55 are formed on the gable wall forming panel 22 and the body front panel 45, extending vertically at a distance from the imaginary line X3 on either side of the imaginary line X3 that hangs down from the apex of the approximately triangular surface portion 34 formed on the gable wall forming panel 22. The spacing between the spout-forming auxiliary fold lines 54, 55 increases as they extend from top to bottom. The upper ends of the spout-forming auxiliary fold lines 54, 55 reach the fold lines 30, 31 formed on the gable wall forming panel 22, and the lower ends cross the body second fold line 53 and reach the left and right body vertical fold lines 3, 4 of the front panel 45.

[0042] In addition, an upwardly curved third fold line 56 is formed on the front panel 45 of the body, which is lower than the lower ends of the auxiliary fold lines 54, 55 for forming the spout, and has left and right ends located at or near the center or higher than the center of the vertical fold lines 3, 4 of the body.

[0043] In addition, a fourth fold line 57 is formed on the approximately triangular surface portion 34 of the gable wall forming panel 22 and the front panel 45 of the body, extending from the vertex of the approximately triangular surface portion 34 across the apex horizontal fold line 24 and the second fold line 53, hanging down on the imaginary line X3, and reaching the third fold line 56.

[0044] To pour liquid contents from the first example paper container 1 configured as described above, first insert your fingers into the space formed between the gable roof forming panels 16, 17, the body front panel 45 and the gable wall forming panel 22, peel away the heat-sealed opposing surfaces of the outer top seal panels 14, 15 and the inner top seal panels 20, 21 on the gable wall forming panel 22 side, which forms the pouring outlet 27, and pull out the gable wall forming panel 22, which is folded between the pair of gable roof forming panels 16, 17, to open the pouring outlet 27 (see Figure 7).

[0045] When opening the spout 27, in this example, the top corner 58 of the body 13, formed by folding the top horizontal fold line 24, is pressed toward the inside of the paper container 1, causing the body front panel 45 to fold from the second fold line 53, and the top corner 58 to bend toward the inside of the paper container 1. This widens the space formed between the gable roof forming panels 16, 17, the body front panel 45, and the gable wall forming panel 22, making it easier to insert fingers.

[0046] When the gable wall forming panel 22 folded between the gable roof forming panels 16, 17 is pulled out, the gable wall forming panel 22 and the body front panel 45 make a mountain fold from the fourth fold line 57, and the body front panel 45 makes a valley fold from the third fold line 56, causing the spout 27 to protrude outward from the paper container 1, and the gable wall forming panel 22 and the body front panel 45 make a mountain fold from the spout formation auxiliary fold lines 54, 55, causing the tip side of the opened spout 27 to expand laterally, making it easier to drink from the spout 27 when used as a drinking spout.

[0047] Once the spout 27 has been opened in this manner, as shown in Figure 8, the body 13 is pressed by grasping with fingers from the left and right at the imaginary intersection points Y1, Y2 with imaginary lines X1, X2 extending laterally from the vertices T of the first fold lines 47, 48 in the left and right body vertical fold lines 5, 10 of the body back panel 46.

[0048] As a result, the torso back panel 46 is mountain-folded along the two first fold lines 47, 48, and the torso back panel 46 side of the torso 13 is easily crushed and depressed at imaginary intersections Y1, Y2 of the left and right torso vertical fold lines 5, 10 of the torso back panel 46 and imaginary lines X1, X2 extending laterally from the vertices T1 of the first fold lines 47, 48, respectively. As a result, the torso left side panel 49 and the torso right side panel 50 are also depressed. In the torso 13, the torso back panel 46 has a minimum width between the vertices T1 of the first fold lines 47, 48, and has concave portions 59 that gradually widen toward the left and right torso vertical fold lines 3, 4 of the torso front panel 45 (see FIGS. 9 and 10). Therefore, by grasping the concave portions 59, a wide area can be placed on the left torso side panel 49 and the right torso side panel 50, making it easy to grip the torso 13 (see FIG. 11).

[0049] Furthermore, in the case of the body 13 in which the body vertical fold lines 5, 10 and the first fold lines 47, 48 are crushed and concave from the imaginary intersection points Y1, Y2, the body back panel 46 has a shape in which the width between the vertices T of the first fold lines 47, 48 is the minimum, and a concave portion 59 is formed that gradually widens toward the left and right body vertical fold lines 3, 4 of the body front panel 45, and the concave portion 59 is inclined in the narrowing direction toward the body back panel 46 side, but since the anti-slip lines 51, 52 extending vertically are formed horizontally on the body left side panel 49 and the body right side panel 50, fingers gripping the concave portions 59 of the body left side panel 49 and the body right side panel 50 will catch on the anti-slip lines 51, 52, preventing the paper container 1 from slipping off the fingers.

[0050] In this example, three (multiple) anti-slip lines 51 and 52 are formed, respectively. Forming a plurality of anti-slip lines 51 and 52 can further improve the anti-slip effect.

[0051] Furthermore, in the first example, the first fold lines 47, 48 are formed in a generally elliptical arc shape with the maximum bulge position as the vertex T1. Therefore, when the torso 13 is pinched and pressed at the imaginary intersection points Y1, Y2 between the imaginary lines X1, X2 extending laterally from the vertices T1 of the first fold lines 47, 48 at the left and right torso vertical fold lines 5, 10 of the torso back panel 46, the back front panel 46 is easily mountain-folded from the first fold lines 47, 48.

[0052] Furthermore, the vertices T1 of the first fold lines 47, 48 are located at approximately the midpoint in the vertical direction of the back panel 46 of the body portion, and therefore the concave portion 59 is formed at approximately the midpoint in the vertical direction of the body portion 13, allowing the paper container 1 to be gripped in a stable state when pouring.

[0053] 12 to 24 show a second embodiment of the paper container according to the present invention, in which FIG. 12 is a perspective view showing the paper container of the second embodiment, FIG. 13 is a front view of the paper container shown in FIG. 12, FIG. 14 is a left side view of the paper container shown in FIG. 12, FIG. 15 is a rear view of the paper container shown in FIG. 12, FIG. 16 is a right side view of the paper container shown in FIG. 12, FIG. 17 is a plan view showing a carton blank of the paper container shown in FIG. 12, and FIG. 18 is an explanatory view showing the operation of crushing the front panel side of the body part of the paper container shown in FIG. 12 from both sides with the spout opened. 19 is a front view of a paper container in which the front panel side of the body part has been crushed from both sides by the action shown in FIG. 18, FIG. 20 is a side view of the paper container shown in FIG. 19, FIG. 21 is an explanatory diagram showing the action of crushing the back panel side of the body part of the paper container shown in FIG. 19 from both sides, FIG. 22 is a back view of a paper container in which the back panel side of the body part has been crushed from both sides by the action shown in FIG. 21, FIG. 23 is a side view of the paper container shown in FIG. 22, and FIG. 24 is an explanatory diagram showing the state in which the body part of the paper container shown in FIG. 23 has been grasped and held.

[0054] The paper container 1 of the second example will be described with the same reference numerals used for the same components as those of the first example. The paper container 1 of the second example is formed from a carton blank 2, which is a paperboard material having a thermoplastic resin laminated on both sides, as shown in Figure 17. As with the first example, the carton blank has four body panels 6, 7, 8, and 9 connected via body longitudinal fold lines 3, 4, and 5. When the paper container 1 is formed, the four body panels 6, 7, 8, and 9 are joined at the edge 12 of the body panel 6 to a vertical seal panel 11 connected to the body panel 9 via a body longitudinal fold line 10, thereby forming a square tubular body 13 of the paper container 1.

[0055] A pair of opposing gable roof forming panels 16, 17, each having outer top seal panels 14, 15 at their upper portions, are connected to the upper ends of the body panels 6, 8 via top horizontal fold lines 18, 19. A pair of opposing gable wall forming panels 22, 23, each having inner top seal panels 20, 21 at their upper portions, are connected to the upper ends of the body panels 7, 9 via top horizontal fold lines 24, 25. The gable wall forming panels 22, 23 are folded between the gable roof forming panels 16, 17, and the outer top seal panels 14, 15 and the inner top seal panels 20, 21 are heated and sealed at predetermined positions to form a top 26. One of the gable wall forming panels 22, 23 folded between the gable roof forming panels 16, 17 is then pulled out and opened to form a spout 27. In the first example, the gable wall forming panel 22 is the gable wall forming panel on the opening side.

[0056] The gable roof forming panels 16, 17 are formed with guide creases 28, 29 on the opening side of the gable wall forming panel 22 to guide the folding of the gable roof forming panels 16, 17 when opened.

[0057] The gable wall forming panels 22, 23 are formed with folding lines 30, 31, 32, 33 for folding the gable wall forming panels 22, 23, and approximately triangular surface portions 34, 35 are formed surrounded by the folding lines 30, 31, 32, 33 and the top horizontal folding lines 24, 25.

[0058] In addition, bottom panels 38, 39 are connected to the lower ends of the body panels 7, 9 via bottom horizontal fold lines 36, 37, and inner panels 42, 43 are connected to the lower ends of the body panels 6, 8 via bottom horizontal fold lines 40, 41, and the inner panels 42, 43 are folded inside the bottom panels 38, 39 and sealed to form a bottom 44.

[0059] Furthermore, when the body panel 7 of the four body panels 6, 7, 8, 9 to which one of the gable wall forming panels 22 that forms the pouring outlet 27 and is opened is connected, i.e., the body panel 7 located on the pouring outlet 27 side, is defined as the body front panel 45, two fifth fold lines 60, 61 are formed on the body front panel 45, which are connected to two base points P3, P4 set at or near the upper and lower ends of the left and right body vertical fold lines 3, 4 of the body front panel 45 and bulge inward in the width direction of the body front panel 45.

[0060] The horizontal width dimension L3 from the body vertical fold lines 3, 4 to the apex T2 of the fifth fold lines 60, 61 is preferably 20% to 30% of the horizontal width dimension L2 of the body front panel 45. If the horizontal width dimension L3 from the body vertical fold lines 3, 4 to the apex T2 of the fifth fold lines 60, 61 is 20% to 30% of the horizontal width dimension L4 of the body front panel 45, as described below, when pouring, the body 13 is crushed so as to pinch the body vertical fold lines 3, 4 of the body front panel 45 from the left and right, and the amount by which the portion of the body front panel 45 surrounded by the fifth fold lines 60, 61 protrudes forward causes the spout 27 of the paper container 1 to open wide vertically, resulting in an amount of protrusion that makes the spout 27 an opening shape that makes pouring easier.

[0061] The vertex T2 of the fifth fold lines 60, 61 is located at the center between two base points P3, P4 set at or near the upper and lower ends of the trunk vertical fold lines 3, 4. In the second example, the fifth fold lines 60, 61 are formed in a substantially elliptical arc shape with the vertex T2 at the maximum bulge position.

[0062] In the second example, the fifth fold lines 60, 61 are formed in a substantially elliptical arc shape, but are not limited to this as long as the shape has the maximum bulge position as the vertex T2. For example, they may be V-shaped, arc-shaped, or polygonal arc-shaped, and may be interrupted discontinuous lines rather than continuous lines.

[0063] In the second example, sixth fold lines 62 and 63 are formed, which extend horizontally from or near the vertices T2 of the fifth fold lines 60 and 61 of the torso front panel 45 toward the left and right torso vertical fold lines 3 and 4, straddling the left and right torso vertical fold lines 3 and 4, and reaching parts of the torso left side panel 49 (torso panel 6) and the torso right side panel 50 (torso panel 8).

[0064] Furthermore, in the second example, two seventh fold lines 64, 65 are formed on the torso back panel 46 (torso panel 9) of the torso 13, which are connected to two base points P5, P6 set in the vertical direction along the left and right torso vertical fold lines 5, 10 on or near the left and right torso vertical fold lines 5, 10 on the torso back panel 46, and which bulge toward the inside in the width direction of the torso back panel 46.

[0065] The vertex T3 of each of the seventh fold lines 64, 65 is located at approximately the same horizontal position as the vertex T2 of each of the fifth fold lines 60, 61. In the second example, the seventh fold lines 64, 65 are formed in a substantially elliptical arc shape with the vertex T3 at the maximum bulge position.

[0066] In the second example, the seventh fold lines 64 and 65 are formed in a substantially elliptical arc shape, but like the fifth fold lines 60 and 61, the shape is not limited to this as long as the maximum bulge position is at the vertex T3, and may be, for example, a V-shape, a rectangular arc shape, or a polygonal rectangular arc shape, and may not be a continuous line but may be a segmented discontinuous line.

[0067] The horizontal dimension L5 from the body vertical fold lines 5, 10 to the apex T3 of the seventh fold lines 64, 64 is preferably 15% to 30% of the horizontal dimension L6 of the body back panel 46. If the horizontal dimension L5 from the vertical torso fold lines 5, 9 to the apex T3 of the seventh fold lines 64, 65 is 15% to 30% of the horizontal dimension L6 of the torso back panel 46, as will be described later, when the virtual intersection sites Y3, Y4 of the left and right torso vertical fold lines 5, 10 of the torso back panel 46 with the virtual lines X4, X5 extending laterally from the apex T3 of each of the seventh fold lines 64, 65 are grasped with fingers from the left and right and pressed down, the amount of depression will be approximately the same as the amount of depression when the vertical torso fold lines 3, 4 of the torso front panel 45 are grasped and pressed down from the left and right. Therefore, the torso 13 has a concave shape with approximately the same amount of depression in the center from the torso front panel 45 via the torso left side panel 49 and right side panel 50 to the torso back panel 46 (see Figures 22 and 23), and the concave portion can be easily grasped.

[0068] In the second example, a plurality of anti-slip creases 66, 67 extending in the vertical direction toward the torso back panel 46 are formed on the left torso side panel 49 and the right torso side panel 50 of the torso 13 at the tip ends of the sixth fold lines 62, 63. The anti-slip creases 66, 67 are formed in a generally elliptical arc shape.

[0069] In the second example, the anti-slip ruled lines 66, 67 are formed in a substantially elliptical arc shape, but they may also be straight, V-shaped, arc-shaped, or polygonal arc-shaped, and may not be continuous lines but may be divided, unconnected lines. Furthermore, although it is preferable to form a plurality of anti-slip ruled lines 66, 67, only one may be formed.

[0070] In the second example, a downward arc-shaped eighth fold line 68 is formed in the body front panel 45 of the body 13, with its end located at or near the upper ends of the left and right body vertical fold lines 3, 4 of the body front panel 45 of the body 13. In addition, a ninth fold line 69 consisting of a straight line extending from the lowest point of the center of the eighth fold line 68, across the apex horizontal fold line 24, and toward the vertex of the approximately triangular surface portion 34 is formed in the body front panel 45 and the gable wall forming panel 22 connected to the body front panel 45.

[0071] To pour liquid contents from the second example paper container 1 configured as described above, first insert your fingers into the space between the gable roof forming panels 16, 17, the body front panel 45 and the gable wall forming panel 22, peel away the heat-sealed opposing surfaces of the outer top seal panels 14, 15 and the inner top seal panel 20 on the gable wall forming panel 22 side, which forms the pouring outlet 27, and pull out the gable wall forming panel 22, which is folded between the pair of gable roof forming panels 16, 17, to open the pouring outlet 27.

[0072] When opening the spout 27, in the second example, the top corner 58 of the body 13 formed by folding the top horizontal fold line 24 is pressed toward the inside of the paper container 1, causing the approximately triangular surface portions 34 of the body front panel 45 and the gable wall forming panel 22 connected to the body front panel 45 to fold in a valley direction from the ninth fold line 69, and the body front panel 45 to fold in a mountain direction from the eighth fold line 68, causing the top corner 58 to recess toward the inside of the paper container 1. This widens the space between the gable roof forming panels 16, 17, the body front panel 45, and the gable wall forming panel 22, making it easier to insert fingers.

[0073] Once the spout 27 has been opened in this manner, as shown in Figure 18, the body 13 is pressed by grasping the intersections 70, 71 of the left and right body vertical fold lines 3, 4 of the body front panel 45 with the sixth fold lines 62, 63 with the fingers from the left and right.

[0074] The sixth fold lines 62, 63 extend horizontally from or near the vertices T2 of the fifth fold lines 60, 61 of the torso front panel 45 toward the left and right torso vertical fold lines 3, 4, straddling the left and right torso vertical fold lines 3, 4, and extending to parts of the torso left side panel 49 and the torso right side panel 50. Therefore, when the torso vertical fold lines 3, 4 are pressed, the torso front panel 45 side of the torso 13 is easily crushed from the intersections 70, 71 of the torso vertical fold lines 3, 4 and the sixth fold lines 62, 63 (see FIG. 19 ).

[0075] As a result, the front body panel 45 is mountain-folded along the two fifth fold lines 60, 61. In the second example, the fifth fold lines 60, 61 are formed in a generally elliptical arc shape with the maximum bulge position as the apex T2, so that the front body panel 45 can be easily mountain-folded along the fifth fold lines 60, 61.

[0076] By folding the body front panel 45 from the fifth fold lines 60, 61 in this manner, the portion of the body front panel 45 surrounded by the two fifth fold lines 60, 61 protrudes forward (see Figure 20), and as a result, the opening of the spout 27 widens vertically, making it easier to pour out the liquid contents.

[0077] In the second example, two seventh fold lines 64, 65 are formed on the body rear panel 46 of the body 13, which are connected to two base points P5, P6 set in the up-down direction along the left and right body vertical fold lines 5, 10 on or near the left and right body vertical fold lines 5, 10 of the body rear panel 46, and which bulge inward in the width direction of the body rear panel 46. The vertices T3 of the seventh fold lines 64, 64 are roughly in the same position in the horizontal direction as the vertices T2 of the fifth fold lines 60, 61, respectively. When pouring out the liquid contents, the intersections 70, 71 of the body vertical fold lines 3, 4 of the body front panel 45 with the sixth fold lines 62, 63 are pinched and crushed with fingers from the left and right, and then the imaginary intersections Y3, Y4 of the seventh fold lines 64, 65 of the left and right body vertical fold lines 5, 10 of the body back panel 46 with imaginary lines X4, X5 extending laterally from their respective vertices T3 are grasped and pinched with fingers from the left and right (see FIG. 21 ) and crushed (see FIG. 22 ).

[0078] As a result, the torso back panel 46 is mountain-folded along the seventh fold lines 64, 65, and the torso back panel 46 side of the torso 13 is crushed at imaginary intersections Y3, Y4 of the torso vertical fold lines 5, 10 of the torso back panel 46 and imaginary lines X4, X5 extending horizontally from the vertices T3 of the seventh fold lines 64, 65, respectively. As a result, the torso 13 has a continuously concave shape in the center from the torso front panel 45, via the torso left side panel 49 and right side panel 50, to the torso back panel 46 (see FIGS. 22 and 23), making it easy to grip the torso 13 by grasping the concave portion (see FIG. 24).

[0079] In the second example, the seventh fold lines 64, 65 are formed in a generally elliptical arc shape with the maximum bulge position as the vertex T3, so that the back body panel 46 can be easily mountain-folded from the seventh fold lines 64, 65.

[0080] In addition, in the second example, multiple anti-slip lines 66, 67 extending vertically toward the back panel 46 of the body are formed on the left side panel 49 and the right side panel 50 of the body 13 at the tip side of the sixth fold lines 62, 63. Therefore, when pouring liquid contents, the concave portions of the left side panel 49 and the right side panel 50 of the body 13 are grasped, but the fingers will catch on the anti-slip lines 66, 67 formed on the left side panel 49 and the right side panel 50 of the body, which effectively prevents the paper container 1 from slipping off the fingers, making it easy to pour the liquid contents.

[0081] 1 Paper container 2 Carton blank 3, 4, 5 Body longitudinal fold line 6, 7, 8, 9 Body panel 10 Body longitudinal fold line 11 Longitudinal seal panel 12 Edge 13 Body 14, 15 Outer top seal panel 16, 17 Gable roof forming panel 18, 19 Top horizontal fold line 20, 21 Inner top seal panel 22, 23 Gable wall forming panel 24, 25 Top horizontal fold line 26 Top 27 Spout 28, 29 Guide fold line 30, 31, 32, 33 Folding crease 34, 35 Approximately triangular surface 36, 37 Bottom horizontal fold line 38, 39 Bottom panel 40, 41 Bottom horizontal fold line 42, 43 Inner panel 44 Bottom 45 Body front panel 46 Body back panel 47, 48 First fold line 49 Body left side panel 50 Body right side panel 51, 52 Anti-slip crease 53 Second fold line 54, 55 Auxiliary fold line for forming spout 56 Third fold line 57 Fourth fold line 58 Top corner 59 Concave portion 60, 61 Fifth fold line 62, 63 Sixth fold line 64, 65 Seventh fold line 66, 67 Anti-slip crease 68 Eighth fold line 69 Ninth fold line 70, 71 Intersection area T1, T2, T3 Vertex L1, L2, L3, L4, L5, L6 Width dimension X1, X2, X3, X4, X5 Imaginary lines Y1, Y2, Y3, Y4 Imaginary intersection area P1, P2, P3, P4, P5, P6 base point

Claims

1. A gable roof-shaped paper container made of paperboard material laminated with thermoplastic resin on both sides, with four body panels connected together via vertical fold lines, with the edges joined by vertical seal panels to form a rectangular body, with a pair of gable roof forming panels facing each other and having an outer top seal panel at their upper ends, and a pair of gable wall forming panels facing each other and having an inner top seal panel at their upper ends, one of which serves as a pouring outlet and can be opened, connected together via a top horizontal fold line, with the pair of gable roof forming panels folded between the pair of gable roof forming panels, and the outer top seal panel and the inner top seal panel being heated and sealed at predetermined positions to form a hermetic top, When the body panel to which one of the four body panels, which serves as the pouring outlet and is opened, is connected is defined as the body front panel, the body panel to which the other gable wall forming panel is connected is defined as the body back panel, and two first fold lines are formed in the body back panel, which is the body panel to which the other gable wall forming panel is connected, that are connected to two base points set in the vertical direction along the left and right body vertical fold lines on or near the left and right body vertical fold lines of the body back panel and that bulge toward the inside in the width direction of the body back panel, and further the left body side panel and the right body side panel are formed with anti-slip lines extending in the vertical direction in the horizontal direction.

2. The paper container according to claim 1, wherein the first fold line is formed in a generally elliptical arc shape with the maximum bulging position as its apex.

3. The paper container according to claim 1 or 2, characterized in that each apex of the first fold lines is located at approximately the middle position in the vertical direction of the body rear panel.

4. A gable roof-shaped paper container made of paperboard material laminated with thermoplastic resin on both sides, having four body panels connected together via vertical fold lines, the edges of which are joined by vertical seal panels to form a rectangular body, and connected to the upper ends of the body panels via horizontal fold lines are a pair of gable roof forming panels facing each other and having an outer top seal panel at their upper parts, and a pair of gable wall forming panels facing each other and having an inner top seal panel at their upper parts, one of which serves as a pouring outlet and can be opened, the pair of gable roof forming panels being folded between the pair of gable roof forming panels, and the outer top seal panel and the inner top seal panel being heated and sealed at predetermined positions to form a hermetic top, When the body panel to which one of the gable wall forming panels that serves as a pouring outlet and is opened is connected is defined as the body front panel, two fifth fold lines are formed on the body front panel, which are connected to two base points set at or near the upper and lower ends of the left and right body vertical fold lines of the body front panel and bulge toward the inside in the width direction of the body front panel, and further, sixth fold lines are formed which extend laterally from the apexes of the two fifth fold lines or near the apexes of the two fifth fold lines toward the left and right body vertical fold lines and straddle the left and right body vertical fold lines to reach parts of the left body side panel and the right body side panel.

5. The paper container according to claim 4, wherein the fifth fold line is formed in a generally elliptical arc shape with the maximum bulging position as its apex.

6. A paper container as described in claim 4 or 5, characterized in that two seventh fold lines are formed on the back panel of the body, the seventh fold lines being connected to two base points set in the vertical direction along the left and right vertical fold lines on or near the left and right vertical fold lines of the back panel of the body, and bulging toward the inside in the width direction of the back panel of the body, and each apex of the seventh fold lines is approximately in the same position horizontally as each apex of the fifth fold line.

7. The paper container according to claim 6, wherein the seventh fold line is formed in a generally elliptical arc shape with the maximum bulging position as its apex.

8. A paper container as described in any one of claims 4 to 7, characterized in that the left side panel of the body and the right side panel of the body have a plurality of anti-slip creases extending in the vertical direction, located at the tip side of the second fold line, toward the rear panel of the body.

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