paper container

Abstract

In a gable-top paper container 1, a body panel 8 on the opening side is provided with a downwardly curved first auxiliary folding line 42 in which left and right ends 40, 41 are positioned at or near intersections 38, 39 between ends of left and right body vertical folding lines 4, 5 of the body panel 8 and left and right ends of a top horizontal folding line 26, and a lowest point U is positioned on a first virtual line L1, which is orthogonal to the top horizontal folding line 26 at the central position of the top horizontal folding line 26. A gable-wall forming panel 24 and the body panel 8 are provided with a pair of vertically extending spout-forming auxiliary folding lines 43, 44 at positions spaced apart from the first virtual line L1, on the left and right sides of the first virtual line L1. The body panel 8 is also provided with an upwardly curved second auxiliary folding line 54 in which left and right ends 52, 53 are positioned on or near the body vertical folding lines 4, 5 on both sides of the body panel 8, at the center or at a position higher than the center of the body panel 8 in the vertical direction. A highest point T of the second auxiliary folding line 54 is positioned on the first virtual line L1.

Description

[[Technical Field]]

[0001] The present invention relates to a paper container for accommodating liquid contents. [[Background Art]]

[0002] Conventionally, as a paper container for accommodating liquid contents such as milk and juice, it is made of a paperboard material with thermoplastic resin laminated on the front and back surfaces, is provided with four body panels, and its edges are joined by a longitudinal seal panel to form a square cylindrical body. A pair of gable roof forming panels which have an outer top seal panel on the upper part and face each other, and a pair of gable wall forming panels which have an inner top seal panel on the upper part, face each other, one of which serves as a spout and is opened, are connected in series to the upper end of the body panel. A gable roof type paper container, in which the top is formed by folding the pair of gable wall forming panels between the pair of gable roof forming panels, heating and sealing the outer top seal panel and the inner top seal panel at predetermined positions to seal the container, is widely used.

[0003] To open such a gable roof type paper container, a user inserts a finger into the space opened between the pair of gable roof forming panels, the body panels and the gable wall forming panels, hooks the finger on the gable wall forming panel and then spreads the container left and right to peel off the heat-sealed opposing surfaces of the outer top seal panel and the inner top seal panel on the opening side, and presses the connection parts between the pair of gable roof forming panels and the opened gable wall forming panel from the left and right sides to pull out the gable wall forming panel folded between the pair of gable roof forming panels, and folds the gable wall forming panel outward from the top horizontal folding line at the boundary between the gable wall forming panel and the body panel connected in series via the top horizontal folding line, so as to open the spout.

[0004] The spout of this gable-roof-shaped paper container is formed by reversing the fold of the gable wall-forming panel that was folded between a pair of gable roof-forming panels. Since the fold in the center of the gable wall-forming panel becomes the tip, the tip becomes pointed, which can make it difficult to drink from. Furthermore, if the tip of the spout is pointed, there is a problem that if the liquid contents contain solids such as soup with ingredients, or if they are viscous substances such as yogurt or jelly, the tip of the spout can get clogged, preventing smooth dispensing.

[0005] One proposed solution to this problem is a gable-roof-shaped paper container in which a fold line is made on the spout during the manufacturing stage of the carton blanks that form the gable-roof-shaped paper container. After opening, the pointed tip of the spout is pulled out and folded along the fold line while pressing it with a finger, thereby flattening the pointed spout and widening it, making it easier to drink from (see, for example, Patent Document 1).

[0006] Furthermore, the spout formed by opening the container as described above has a horizontally elongated rhomboid shape, resulting in a small opening area and making it difficult to pour because the liquid flows out in a wide, horizontal manner.

[0007] Therefore, in order to obtain an easy-to-pour spout, a paper container has been proposed in which a spout fold line is provided vertically from the center of the gable wall forming panel, which is folded between a pair of gable roof forming panels, toward the body panel connected to the gable wall forming panel, the gable wall forming panel is pulled out from between the pair of gable roof forming panels, and the gable wall forming panel and the body panel are folded into a V shape from the spout fold line to form a spout (see, for example, Patent Document 2).

[0008] According to this paper container, the opening spout is formed with a continuous, smooth curve, allowing the contents to flow out smoothly. [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] Patent No. 6078757 [Patent Document 2] Japanese Utility Model Publication No. 7-33820 [Overview of the project] [Problems that the invention aims to solve]

[0010] However, the paper container described in Patent Document 1 requires a cumbersome process when opening it: pulling out the end wall forming panel to open the spout, then pressing the pointed tip of the opened spout with a finger to fold along the fold line and flatten the pointed spout. Furthermore, when folding along the fold line to flatten the pointed spout, a large surface area of ​​the spout that comes into contact with the mouth is touched by the fingers, which is unhygienic considering the risk of bacteria and viruses adhering to the hands.

[0011] Furthermore, in the paper container described in Patent Document 2, the spout, which is formed by folding the end wall panel and the body panel into a V-shape and making them protrude, maintains its shape, i.e., protruding state, when the shoulder of the paper container is pressed with fingers from both sides. When the pressure on the shoulder of the paper container is released, the end wall panel and the body panel, which were folded into a V-shape, become flat due to the restoring force of the cardboard material, causing the opening of the spout to narrow or close.

[0012] Therefore, each time you want to dispense, you have to pull out the end wall forming panel, pinch the shoulder of the paper container from both sides with your fingers and pressurize it to fold the end wall forming panel and the body panel into a V shape and make them pop out, which is troublesome. Also, each time you pull out the end wall forming panel, your fingers touch the opening of the dispensing spout, so there is a risk of bacteria and viruses adhering to your hands, which is unhygienic.

[0013] The first object of the present invention is to provide a paper container in which, simply by pulling out the gable wall forming panel that serves as the spout, which is folded between a pair of gable roof forming panels, the tip of the opened spout expands into a straight, flat surface. A second object of the present invention is to provide a paper container that can maintain a spout, formed by pulling out and protruding the gable wall forming panel that is folded between the gable roof forming panels, in a protruding state. [Means for solving the problem]

[0014] To achieve the above objective, the invention described in claim 1 is a gable roof type paper container comprising 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 seal panels to form a square body, a pair of gable roof forming panels facing each other and having an outer top seal panel on top, and a pair of gable wall forming panels facing each other and having an inner top seal panel on top, with one of them serving as a spout for opening, connected to the upper end of the body panels, a folding line is formed on the pair of gable wall forming panels, the pair of gable wall forming panels are folded in between the pair of gable roof forming panels by valley folding along the folding line, and the top is formed when the outer top seal panel and the inner top seal panel are heated and sealed at a predetermined position, The body panel on the opening side, which is connected to the end wall forming panel on the opening side via a top horizontal fold line, has downward-curving first auxiliary fold lines formed on it. These fold lines are located at or near the intersection of the ends of the left and right body vertical fold lines and the left and right ends of the top horizontal fold line, with the lowest point being at the center of the top horizontal fold line and on a first imaginary line perpendicular to the top horizontal fold line. The end wall forming panel and the body panel on the opening side have these fold lines on either side of the first imaginary line. Before Note: Leave a gap from the first virtual line. , intersecting with the aforementioned transverse fold line at the top A pair of auxiliary fold lines for forming a spout are formed, extending in the vertical direction. is the 1. With a gap between the virtual lines ,So upper end It is located on the folding line of the end wall forming panel on the opening side, The lower end where the first auxiliary polyline is located It is characterized by the following:

[0015] According to the invention described in claim 1, when opening the container, the top corner of the body formed at the upper end of the body panel on the opening side is pushed inward into the paper container, causing the upper end of the body panel to fold inward from the first auxiliary fold line, the top corner to curve inward into the paper container, the upper end of the body panel enclosed by the substantially triangular surface of the end wall forming panel and the first auxiliary fold line of the body panel to become recessed, and a wide space is formed between the body panel and the end wall forming panel.

[0016] Then, in accordance with the recess at the upper end of the end wall forming panel, which is enclosed by the substantially triangular surface portion of the end wall forming panel and the first auxiliary fold line of the body panel, the substantially triangular surface portion of the end wall forming panel on the opening side and the body panel are valley-folded from the pair of auxiliary fold lines of the spout forming.

[0017] Then, by placing a finger on the gable wall forming panel and spreading it to the left and right to separate the heat-sealed opposing surfaces of the outer top seal panel and the inner top seal panel, the connecting side edges of the spread gable roof forming panel and the gable wall forming panel are pushed inward from the left and right, causing the gable wall forming panel to be pushed apart from the gable roof forming panel, opening the spout and opening the paper container.

[0018] When the gable wall forming panel is pushed out from the gable roof forming panel, when force is applied to push the connecting side edges of the gable roof forming panel and the gable wall forming panel inward from the left and right, the outlet forming auxiliary fold lines guide the gable wall forming panel and the body panel to fold inwards, allowing the gable wall forming panel to be easily pushed out in the direction away from the gable roof forming panel.

[0019] As said end wall forming panels are pushed and expanded, the said end wall forming panels and body panels that have been mountain-folded along the auxiliary spout forming folding lines have a substantially flat surface between the pair of auxiliary spout forming folding lines, the tip of the opened spout becomes linear and the spout expands, so it is easier to drink when the spout is used as a drinking opening. In addition, in order to expand the spout, there is no need for the operation of pushing in the sharp tip of the spout with a finger and folding the bending line to flatten the sharp spout like the paper container described in Patent Document 1. Moreover, it is hygienic because there is no need to touch the spout with a finger to flatten the spout. Furthermore, the pair of spout-forming auxiliary fold lines intersect with the top horizontal fold line, and the upper end of Since the lower end of the gable wall forming panel on the opening side is located on the folding line for folding, and its lower end is located on the first auxiliary fold line, when the connecting side edges of the gable roof forming panel and the gable wall forming panel are pushed inward from the left and right sides, the mountain folds of the gable wall forming panel and the body panel from the auxiliary fold line for pouring outlets are made easier, and the gable wall forming panel can be pushed outwards from the gable roof forming panel more easily.

[0020] The invention according to claim 2 is In a gable-roof type paper container, the container is made of a cardboard material with thermoplastic resin laminated on its front and back surfaces, and comprises four body panels, the edges of which are joined by vertical sealing panels to form a square body, and at the upper end of the body panels, 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, and the pair of gable wall forming panels have folding lines for folding, and the pair of gable wall forming panels are folded between the pair of gable roof forming panels by valley folding along the folding lines, 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. The body panel on the opening side, which is connected to the end wall forming panel on the opening side via a top horizontal fold line, has a downward-curving first auxiliary fold line formed on it, with its left and right ends positioned at or near the intersection of the ends of the left and right body vertical fold lines on the opening side body panel and the left and right ends of the top horizontal fold line, and its lowest point being at the center position of the top horizontal fold line and on a first imaginary line perpendicular to the top horizontal fold line. The end wall forming panel and the body panel on the opening side have a pair of spout forming auxiliary fold lines formed on either side of the first imaginary line, spaced apart from the first imaginary line, intersecting the top horizontal fold line and extending vertically. The pair of spout forming auxiliary fold lines are spaced apart from the first imaginary line, with their upper ends located at the upper end of the end wall forming panel on the opening side and their lower ends located on the first auxiliary fold line. .

[0021] According to the invention described in claim 2, Since the upper ends of the pair of spout-forming auxiliary fold lines are located at the upper ends of the gable wall forming panel on the opening side, when force is applied to push the connecting side edges of the gable roof forming panel and the gable wall forming panel inward from both sides, the spout-forming auxiliary fold lines effectively guide the mountain folds of the gable wall forming panel and the body panel, allowing the gable wall forming panel to be easily pushed apart from the gable roof forming panel. Furthermore, because the upper ends of the pair of spout-forming auxiliary fold lines are located at the upper ends of the end wall forming panel on the opening side, the inner top seal panel on the upper part of the end wall forming panel also folds at a clear angle on the virtual extension of the pair of spout-forming auxiliary fold lines, causing the tip of the opened spout to widen and become more straight, making it easier to drink from when the spout is used as a drinking spout, and also allowing for smoother dispensing of liquids containing solids or viscous substances. Furthermore, since the lower ends of the pair of spout-forming auxiliary fold lines are located at the first auxiliary fold line, when the connecting side edges of the gable roof forming panel and the gable wall forming panel are pushed inward from the left and right, the mountain folds of the gable wall forming panel and the body panel from the spout-forming auxiliary fold lines become even easier, and the gable wall forming panel can be pushed outwards from the gable roof forming panel even more easily.

[0022] The invention described in claim 3 is a gable roof type paper container comprising 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 square 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, having folding lines formed on the pair of gable wall forming panels, the pair of gable wall forming panels being folded in between the pair of gable roof forming panels by valley folding along the folding lines, and the top is formed when the outer top sealing panel and the inner top sealing panel are heated and sealed at predetermined positions. , The body panel on the opening side, which is connected to the end wall forming panel on the opening side via a top horizontal fold line, has a downward-curving first auxiliary fold line formed on it, with its left and right ends positioned at or near the intersection of the ends of the left and right body vertical fold lines of the body panel on the opening side and the left and right ends of the top horizontal fold line, and its lowest point located on a first imaginary line perpendicular to the top horizontal fold line at the center position of the top horizontal fold line. The end wall forming panel and the body panel on the opening side have a pair of spout forming auxiliary fold lines formed on either side of the first imaginary line, spaced apart from the first imaginary line, intersecting the top horizontal fold line and extending vertically. The pair of spout forming auxiliary fold lines are spaced apart from the first imaginary line, with their upper ends located at the upper end of the top seal panel on the upper part of the end wall forming panel on the opening side, and their lower ends located on the first auxiliary fold line. .

[0023] According to the invention described in claim 3, since the pair of spout-forming auxiliary fold lines have their upper ends located at the upper end of the inner top seal panel which is on the upper part of the gable wall forming panel on the opening side, when force is applied to push the connecting side edges of the gable roof forming panel and the gable wall forming panel inward from the left and right, the spout-forming auxiliary fold lines more effectively guide the mountain folds of the inner top seal panel, the gable wall forming panel and the body panel, and the gable wall forming panel can be easily pushed apart in the direction away from the gable roof forming panel. Furthermore, since the upper ends of the pair of spout-forming auxiliary fold lines are located at the upper end of the inner top seal panel which is located on the upper part of the end wall forming panel on the opening side, the inner top seal panel also folds in a mountain shape from the pair of spout-forming auxiliary fold lines. As a result, the tip of the opened spout becomes straighter and wider, making the spout opening larger. This makes it easier to drink from the spout when it is used as a drinking spout, and also allows for smoother dispensing of liquids containing solids or viscous substances. Furthermore, since the lower ends of the pair of spout-forming auxiliary fold lines are located at the first auxiliary fold line, when the connecting side edges of the gable roof forming panel and the gable wall forming panel are pushed inward from the left and right, the mountain folds of the gable wall forming panel and the body panel from the spout-forming auxiliary fold lines become even easier, and the gable wall forming panel can be pushed outwards from the gable roof forming panel even more easily.

[0025] Claim 4 The invention described in, according to claim 1 Any one of the three items from described above, the pair of auxiliary spout forming folding lines are The distance between them increases as you move from top to bottom. characterized by

[0026] Claim 4 According to the invention described in, the pair of auxiliary spout forming folding lines are As the distance between them widens from top to bottom, when the connecting edges of the gable roof forming panel and the gable wall forming panel are pushed inward from the left and right, the gable wall forming panel and the body panel can be easily folded from the outlet forming auxiliary fold line, and the gable wall forming panel can be pushed outwards from the gable roof forming panel even more easily.

[0030] Claim 5 The invention described in, according to claim 4The pair of spout-forming auxiliary fold lines described above are characterized in that their lower ends extend beyond the first auxiliary fold line and are located on or near the vertical fold lines of the body on both sides of the body panel.

[0031] Claim 5 According to the invention described above, the lower ends of the pair of spout-forming auxiliary fold lines extend beyond the first auxiliary fold line to the vertical fold lines on both sides of the body panel or to their vicinity. Therefore, when the connecting side edges of the gable roof forming panel and the gable wall forming panel are pushed inward from the left and right, the mountain fold of the body panel from the spout-forming auxiliary fold lines becomes even easier, and the gable wall forming panel can be pushed out more easily in the direction away from the gable roof forming panel.

[0032] Claim 6 The invention described in the claim 5 The lower end of the pair of spout-forming auxiliary fold lines described above is lower than the lowest point of the first auxiliary fold line and is located at or above the vertical center of the vertical fold line of the body.

[0033] Claim 6 According to the invention described above, the lower ends of the pair of spout-forming auxiliary fold lines are lower than the lowest point of the first auxiliary fold line and higher than the vertical center of the body vertical fold line, so that when the connecting side edges of the gable roof forming panel and the gable wall forming panel are pushed inward from the left and right, the mountain fold of the body panel from the spout-forming auxiliary fold line becomes even easier. [Effects of the Invention]

[0051] As described above, with the paper container according to the present invention, when opening, after placing your fingers on the gable wall forming panel and spreading it to the left and right to separate the heat-sealed opposing surfaces of the outer top seal panel and the inner top seal panel, you can push the connecting side edges of the spread gable roof forming panel and the gable wall forming panel inward from both sides, thereby pushing the gable wall forming panel away from the gable roof forming panel to open the spout and open the paper container. This is hygienically preferable as it eliminates the need to directly touch the spout with your fingers.

[0052] Furthermore, because the tip of the spout has a gentle, almost straight shape, when the spout is used as a drinking spout, it has a pleasant mouthfeel and is easy to drink from, and it also allows for smooth dispensing of liquids containing solids and viscous substances.

[0053] Furthermore, the spout, formed by pulling out and protruding the gable wall forming panel that is folded between the gable roof forming panels, can be kept in a protruding state even when the pressure on the shoulder of the paper container is released. This eliminates the hassle of having to pull out the gable wall forming panel and fold the gable wall forming panel and the body panel into a V shape to make them protrude each time you want to dispense, and it is also hygienically preferable because you do not have to touch the opening of the spout with your fingers each time you pull out the gable wall forming panel. [Brief explanation of the drawing]

[0054] [Figure 1] This is a side view of the opening side, illustrating a first example of an embodiment of the paper container according to the present invention. [Figure 2] Figure 1 is a plan view showing the carton blanks of the paper container. [Figure 3] Figure 1 is a side view of the opened side of the paper container, showing the end wall forming panel spread open to the left and right, separating the heat-sealed opposing surfaces of the outer top seal panel and the inner top seal panel. [Figure 4] Figure 3 is a side view of the opening side, showing the state after the connecting side edges of the widened gable roof forming panel and the gable wall forming panel are pushed inward from both sides, allowing the gable wall forming panel to be easily pushed outward from the gable roof forming panel, and the spout opening. [Figure 5] This is a plan view of Figure 4. [Figure 6] Figure 4 is a front view. [Figure 7] This is a partially omitted plan view showing a carton blank of a second example of an embodiment of the paper container according to the present invention. [Figure 8] Figure 7 is a plan view showing the spout of a second example of a paper container formed from carton blanks, with the spout open. [Figure 9] This is a partially omitted plan view showing a carton blank of a third embodiment of the paper container according to the present invention. [Figure 10] This is a side view of the opening side, illustrating a fourth embodiment of the paper container according to the present invention. [Figure 11] Figure 10 is a partially abbreviated plan view showing the carton blanks of the paper containers shown. [Figure 12] Figure 10 is a side view of the opened side of the paper container, showing the end wall forming panel of the paper container spread open to the left and right, separating the heat-sealed opposing surfaces of the outer top seal panel and the inner top seal panel. [Figure 13] Figure 12 is a side view of the opening side, showing the state after the connecting side edges of the widened gable roof forming panel and the gable wall forming panel are pushed inward from both sides, allowing the gable wall forming panel to be easily pushed outward from the gable roof forming panel, and the spout opening. [Figure 14] This is a plan view of Figure 13. [Figure 15] Figure 13 is a front view. [Figure 16] This is a side view of the opening side showing a fifth example of an embodiment of the paper container according to the present invention. [Figure 17] Figure 16 is a plan view showing the carton blanks of the paper containers. [Figure 18] Figure 16 is an explanatory diagram showing another example of the second auxiliary fold line of the paper container. [Figure 19] Figure 16 is an explanatory diagram showing another example of the second auxiliary fold line of the paper container. [Figure 20] Figure 16 is an explanatory diagram showing another example of the second auxiliary fold line of the paper container. [Figure 21] Figure 16 is a side view of the opened side of the paper container, showing the end wall forming panel of the paper container spread open to the left and right, separating the heat-sealed opposing surfaces of the outer top seal panel and the inner top seal panel. [Figure 22] Figure 21 is a side view of the opened side, showing the state where the connecting side edges of the widened gable roof forming panel and the gable wall forming panel are pushed inward from both sides, and the gable wall forming panel is pushed outward from the gable roof forming panel, opening the spout. [Figure 23] This is a plan view of Figure 22. [Figure 24] This is a front view of Figure 22. [Figure 25] This is a side view of the opening side showing a sixth example of an embodiment of the paper container according to the present invention. [Figure 26] Figure 25 is a partially abbreviated plan view showing the carton blanks of the paper containers shown. [Figure 27] Figure 25 is a side view of the opened side of the paper container, showing the end wall forming panel of the paper container spread open to the left and right, separating the heat-sealed opposing surfaces of the outer top seal panel and the inner top seal panel. [Figure 28] Figure 27 is a side view of the opened side, showing the state where the connecting side edges of the widened gable roof forming panel and the gable wall forming panel are pushed inward from both sides, and the gable wall forming panel is pushed outward from the gable roof forming panel, opening the spout. [Figure 29] This is a plan view of Figure 28. [Figure 30] This is a front view of Figure 28. [Figure 31] This is a side view of the opening side showing a seventh embodiment of the paper container according to the present invention. [Figure 32] Figure 31 is a partially abbreviated plan view showing the carton blanks of the paper containers shown. [Figure 33] Figure 31 is a side view of the opened side of the paper container, showing the end wall forming panel of the paper container spread open to the left and right, separating the heat-sealed opposing surfaces of the outer top seal panel and the inner top seal panel. [Figure 34] Figure 33 is a side view of the opened side, showing the gable wall forming panel easily pushed open in the direction away from the gable roof forming panel by pushing the connecting side edges of the expanded gable roof forming panel and the gable wall forming panel inward from both sides, thereby opening the spout. [Figure 35] This is a plan view of Figure 34. [Figure 36] This is a front view of Figure 34. [Modes for carrying out the invention]

[0055] Hereinafter, embodiments for implementing the paper container according to the present invention will be described in detail with reference to the drawings. Figures 1 to 6 show a first example of an embodiment of the paper container according to the present invention. Figure 1 is a side view of the opening side of the first example of the paper container, Figure 2 is a plan view showing the carton blanks of the paper container shown in Figure 1, Figure 3 is a side view of the opening side showing the state in which the gable wall forming panel of the paper container shown in Figure 1 has been spread open to the left and right, separating the heat-sealed opposing surfaces of the outer top seal panel and the inner top seal panel, Figure 4 is a side view of the opening side showing the state in which the connecting side edges of the spread gable roof forming panel and the gable wall forming panel shown in Figure 3 have been pushed inward from the left and right, and the gable wall forming panel has been easily pushed open in the direction away from the gable roof forming panel, opening the spout, Figure 5 is a plan view of Figure 4, and Figure 6 is a front view of Figure 4.

[0056] The first example of paper container 1 is formed from carton blanks 2, which are cardboard material with thermoplastic resin laminated on the front and back surfaces as shown in Figure 2. The carton blanks have four body panels 6, 7, 8, and 9 connected via body vertical fold lines 3, 4, and 5. When forming the gable roof type paper container 1, the four body panels 6, 7, 8, and 9 are joined to the body panel 9 via a body vertical fold line 10 by a vertical sealing panel 11 and the edge 12 of the body panel 6, forming the rectangular cylindrical body 13 of the paper container.

[0057] At the upper ends of the body panels 7 and 9, a pair of gable roof forming panels 16 and 17, each having an outer top seal panel 14 and 15 at the top and facing each other, are connected via top horizontal fold lines 18 and 19. Also, at the upper ends of the body panels 6 and 8, a pair of gable wall forming panels 23 and 24, each having an inner top seal panel 20 and 21 at the top and facing each other, with one of them serving as a spout 22 for opening, are connected via top horizontal fold lines 25 and 26. In the first example, gable wall forming panel 24 is the gable wall forming panel on the opening side.

[0058] Then, the gable wall forming panels 23 and 24 are folded between the gable roof forming panels 16 and 17, and the top portion 55 is locked in place by heating and sealing the outer top seal panels 14 and 15 and the inner top seal panels 20 and 21 in their respective positions.

[0059] The gable roof forming panels 16 and 17 have guide fold lines 27 and 28 formed on the side of the gable wall forming panel 24 on the opening side, which guides the folding of the gable roof forming panels 16 and 17 when opening. The gable roof forming panel 16 is also provided with a straw spout 31, which is formed by a first half-cut 29 that serves as a straw insertion opening formed on the back side and a second half-cut 30 that is formed on the front side to surround the first half-cut 29.

[0060] The gable wall forming panels 23 and 24 have folding lines 32, 33, 34, and 35 formed on them for folding. In addition, roughly triangular surfaces 36 and 37 are formed, enclosed by the folding lines 32, 33, 34, and 35 and the top horizontal folding lines 25 and 26.

[0061] Furthermore, on the body panel 8 on the opening side, which is connected to the end wall forming panel 24 via a top horizontal fold line 26, the left and right ends 40 and 41 are positioned at or near the intersection points 38 and 39 of the ends of the body vertical fold lines 4 and 5 on both sides and the ends of the top horizontal fold line 26, and a downward curved first auxiliary fold line 42 is formed, with the lowest point U being at the center position of the top horizontal fold line 26 and lying on a first imaginary line L1 perpendicular to the top horizontal fold line 26.

[0062] In the first example, the ends 40 and 41 of the auxiliary fold line 42 are located slightly away from the intersections 38 and 39 of the ends of the body vertical fold lines 4 and 5 and the end of the top horizontal fold line 26, and are in the vicinity of the intersections 38 and 39. However, the ends 40 and 41 of the auxiliary fold line 42 may be connected to the intersections 38 and 39.

[0063] Furthermore, the end wall forming panel 24 and the body panel 8 have a pair of outlet forming auxiliary fold lines 43 and 44 formed on either side of the first virtual line L1, extending vertically at a distance from the first virtual line L1.

[0064] In the first example, the pair of spout-forming auxiliary fold lines 43 and 44 are spaced further apart from each other as they extend from top to bottom. The upper ends 45 and 46 of the spout-forming auxiliary fold lines 43 and 44 are connected to the folding fold lines 34 and 35 formed on the gable wall forming panel 24. Located The lower ends 47 and 48 are aligned with the first auxiliary fold line 42. Located It is.

[0065] The paper container 1 formed from the carton blanks 2 constructed in this manner is opened as follows.

[0066] First, the top corner 49 of the body portion 13, formed at the upper end of the opening side body panel 8, is pushed inward into the paper container 1. As a result, the upper end of the body panel 8 is folded inward from the first auxiliary fold line 42, the top corner 49 curves inward into the paper container 1, and the upper end of the body panel 8, surrounded by the roughly triangular surface portion 37 of the end wall forming panel 24 and the first auxiliary fold line 42, is recessed, creating a wide space between the body panel 8 and the end wall forming panel 24.

[0067] Then, in accordance with the recess at the upper end enclosed by the roughly triangular surface portion 37 of the end wall forming panel 24 and the first auxiliary fold line 42 of the body panel 8, the roughly triangular surface portion 37 of the end wall forming panel 24 and the body panel 8 are valley-folded from the pair of auxiliary fold lines 43 and 44 that form the spout.

[0068] Next, place your fingers on the end wall forming panel 24 and spread it to the left and right to separate and spread apart the heat-sealed opposing surfaces of the outer top seal panels 14, 15 and the inner top seal panel 21 (see Figure 3).

[0069] After spreading out the gable wall forming panel 24, push the connecting side edges 50 and 51 between the gable roof forming panels 16 and 17 and the gable wall forming panel 24 inward from the left and right (in the direction of the arrows in Figure 3), and pull out the gable wall forming panel 24 by pushing it away from the gable roof forming panels 14 and 15, causing it to protrude outward from the paper container 1, thereby opening the spout 22 and opening the paper container 1. (See Figure 4).

[0070] At this time, the gable wall forming panel 24 and the body panel 8 have a pair of spout-forming auxiliary fold lines 43 and 44 that extend vertically at a distance from the first imaginary line L1, on either side of the first imaginary line L1. When force is applied to push the connecting side edges 50 and 51 of the gable roof forming panels 16 and 17 and the gable wall forming panel 24 inward from the left and right, the spout-forming auxiliary fold lines 43 and 44 guide the gable wall forming panel 24 and the body panel 8 to make mountain folds, easily pushing the gable wall forming panel 24 away from the gable roof forming panels 16 and 17 and causing it to protrude outward from the paper container 1.

[0071] In the first example, the pair of spout-forming auxiliary fold lines 43 and 44 are spaced further apart from each other as they extend from top to bottom. When the connecting side edges 50 and 51 of the gable roof forming panels 16 and 17 and the gable wall forming panel 24 are pushed inward from the left and right, the gable wall forming panel 24 and the body panel 8 can be easily folded from the spout-forming auxiliary fold lines 43 and 44. This allows the gable wall forming panel 24 to be easily pushed outward from the gable roof forming panels 16 and 17, causing it to protrude outward from the paper container 1.

[0072] Then, the expanded end wall forming panel 24 and body panel 8 are folded in a mountain shape along the auxiliary fold lines 43 and 44 for forming the spout, and the surface between the auxiliary fold lines 43 and 44 for forming the spout becomes almost flat, so the tip 22a of the opened spout 22 becomes roughly straight and the spout 22 widens (see Figure 5).

[0073] As described above, in the first example of the paper container 1, a pair of spout-forming auxiliary fold lines 43 and 44 extending in the vertical direction are formed on the gable wall forming panel 24 and the body panel 8. As the connecting side edges 50 and 51 between the gable roof forming panels 16 and 17 and the gable wall forming panel 24 are pushed inward from the left and right, the spout-forming auxiliary fold lines 43 and 44 guide the gable wall forming panel 24 and the body panel 8 to make mountain folds. The gable wall forming panel 24 can be easily pushed outward from the gable roof forming panels 16 and 17, and the paper container 1 can be easily opened.

[0074] Then, the expanded end wall forming panel 24 and body panel 8 are folded along the spout forming auxiliary fold lines 43 and 44, and the surface between the spout forming auxiliary fold lines 43 and 44 becomes almost flat, and the tip 22a of the opened spout 22 spreads out in a generally straight shape. Therefore, it is not necessary to press the pointed tip of the spout with a finger to fold the bend line and flatten the pointed spout, as is done with paper containers described in Patent Document 1, and there is no need to touch the spout with a finger to flatten it.

[0075] Figures 7 and 8 show a second example of an embodiment of the paper container according to the present invention. Figure 7 is a partially abbreviated plan view showing the carton blanks of the second example paper container, and Figure 8 is a plan view showing the second example paper container formed from the carton blanks shown in Figure 7 with the spout open.

[0076] The paper container 1 in the second example is identical in basic configuration to that of the first example, and the same components as in the first example are denoted by the same reference numerals.

[0077] The difference between the second example of paper container 1 and the first example is that in the second example, the upper ends 45, 56 of the spout-forming auxiliary fold lines 43, 44 are at the upper end of the end wall forming panel 24. Located It is located in that place. The other components are the same as in the first example, so we will refer to the explanation and drawings of the first example.

[0078] In the second example of paper container 1, the upper ends 45 and 56 of the spout-forming auxiliary fold lines 43 and 44 are at the upper end of the end wall forming panel 24. Located Therefore, when force is applied to push the connecting side edges 50, 51 between the gable roof forming panels 16, 17 and the gable wall forming panel 24 inward from the left and right, the outlet forming auxiliary fold lines 43, 44 more effectively guide the mountain folds of the gable wall forming panel 24 and the body panel 8, allowing the gable wall forming panel 24 to be easily pushed outward from the gable roof forming panels 16, 17.

[0079] Furthermore, the spout-forming auxiliary fold lines 43 and 44 have their upper ends 45 and 46 at the upper end of the gable wall forming panel 24. Located As a result, the inner top seal panel 21 located on the upper part of the gable wall forming panel 24 also folds at a clear angle on the virtual extension lines of the spout forming auxiliary fold lines 43 and 44, causing the tip 22a of the opened spout 22 to become straighter and spread wider. The other effects are the same as in the first example, so we will refer to the first example.

[0080] Figure 9 shows a third example of an embodiment of the paper container according to the present invention, and Figure 9 is a partially abbreviated plan view showing the carton blanks of the third example of the paper container.

[0081] The paper container 1 in the third example is identical in basic configuration to that of the first example, and the same components as in the first example are denoted by the same reference numerals.

[0082] The difference between the third example of paper container 1 and the first example is that in the third example, the upper ends 45, 56 of the spout-forming auxiliary fold lines 43, 44 are located at the upper end of the inner top seal panel, which is located at the top of the end wall forming panel. Located It is located where it is. The other components are the same as in the first example, so we will refer to the explanation and drawings of the first example.

[0083] In the third example of the paper container 1, the upper ends 45 and 56 of the spout-forming auxiliary fold lines 43 and 44 are located at the upper end of the inner top seal panel 21 which is located at the top of the end wall forming panel 24. LocatedTherefore, when force is applied to push the connecting side edges 50, 51 between the gable roof forming panels 16, 17 and the gable wall forming panel 24 inward from the left and right, the outlet forming auxiliary fold lines 43, 44 more effectively guide the mountain folds of the inner top seal panel 21, the gable wall forming panel 24 and the body panel 8, allowing the gable wall forming panel 24 to be easily pushed outward from the gable roof forming panels 16, 17. The other effects are the same as in the first example, so we will refer to the first example.

[0084] Figures 10 to 15 show a fourth example of an embodiment of the paper container according to the present invention. Figure 10 is a side view of the paper container of the fourth example, showing the opening side. Figure 11 is a partially omitted plan view showing the carton blanks of the paper container shown in Figure 10. Figure 12 is a side view of the paper container shown in Figure 10, showing the gable wall forming panel spread to the left and right, separating the heat-sealed opposing surfaces of the outer top seal panel and the inner top seal panel. Figure 13 is a side view of the paper container shown in Figure 12, showing the connecting side edges of the spread gable roof forming panel and the gable wall forming panel pushed inward from the left and right, easily pushing the gable wall forming panel away from the gable roof forming panel, and opening the spout. Figure 14 is a plan view of Figure 13, and Figure 15 is a front view of Figure 13.

[0085] The paper container 1 in the fourth example is no different in its basic configuration from the first, second, and third examples, and the same components as in the first, second, and third examples will be denoted by the same reference numerals in the description.

[0086] The difference between paper container 1 in Example 4 and Examples 1, 2, and 3 lies in the configuration of the spout-forming auxiliary fold lines 43 and 44. In the explanation of Example 4, Example 3 will be used as the basic configuration.

[0087] In the fourth example, the spout-forming auxiliary fold lines 43, 44 have their lower ends 47, 48 extending beyond the first auxiliary fold line 42 to the body vertical fold lines 4, 5 or their vicinity on both sides of the body panel 8. Location In the fourth example, the lower ends 47 and 48 of the spout-forming auxiliary fold lines 43 and 44 reach the vertical fold lines 4 and 5 on both sides of the body panel 8, but they may be in the vicinity of the vertical fold lines 4 and 5.

[0088] Furthermore, the lower ends 47 and 48 of the spout-forming auxiliary fold lines 43 and 44 are lower than the lowest point U of the first auxiliary fold line 42, and are located at or above the vertical center of the vertical fold lines 4 and 5 of the body. The rest of the configuration is the same as in the third example, so we will refer to the explanation in the third example.

[0089] According to the fourth example of the paper container 1, the spout-forming auxiliary fold lines 43, 44 have their lower ends 47, 48 extending beyond the first auxiliary fold line 42 to the body vertical fold lines 4, 5 or their vicinity on both sides of the body panel 8. Located Therefore, when the connecting side edges 50, 51 of the gable roof forming panels 16, 17 and the gable wall forming panel 24 are pushed inward from the left and right, the mountain fold of the body panel 8 from the outlet forming auxiliary fold lines 43, 44 becomes even easier, and the gable wall forming panel 24 can be pushed outwards from the gable roof forming panels 16, 17 even more easily.

[0090] Furthermore, the lower ends 47 and 48 of the spout-forming auxiliary fold lines 43 and 44 are lower than the lowest point U of the first auxiliary fold line 42 and are located at or above the vertical center of the body vertical fold lines 4 and 5, making it even easier to fold the body panel 8 from the spout-forming auxiliary fold lines 43 and 44. The other effects are the same as in the third example, so we will refer to the third example and omit its explanation.

[0091] Figures 16 to 24 show a fifth example of an embodiment of the paper container according to the present invention. Figure 16 is a side view of the paper container of the fifth example, showing the opening side. Figure 17 is a plan view showing the carton blanks of the paper container shown in Figure 16. Figures 18, 19, and 20 are explanatory diagrams showing other examples of the second auxiliary fold line of the paper container shown in Figure 16. Figure 21 is a side view of the paper container shown in Figure 16, showing the gable wall forming panel spread to the left and right, separating the heat-sealed opposing surfaces of the outer top seal panel and the inner top seal panel. Figure 22 is a side view of the paper container shown in Figure 21, showing the connecting side edges of the spread gable roof forming panel and the gable wall forming panel pushed inward from the left and right, pushing the gable wall forming panel away from the gable roof forming panel, opening the spout. Figure 23 is a plan view of Figure 22. Figure 24 is a front view of Figure 22.

[0092] The paper container 1 in the fifth example is identical in basic structure to that of the first example, and the same components as in the first example are denoted by the same reference numerals.

[0093] The difference between the fifth example of paper container 1 and the first example is that the fifth example does not have the downward-curving first auxiliary fold line 42 of the first example, but instead has an upward-curving second auxiliary fold line 54. In the fifth example, the body panel 8 on the opening side, which is connected to the gable wall forming panel 24 via a top horizontal fold line 26, has upward-curving second auxiliary fold lines 54 formed at the left and right ends 52, 53, which are located on or near the body vertical fold lines 4, 5 on both sides of the body panel 8, at or above the vertical center of the body panel 8. The uppermost point T of the second auxiliary fold line 54 is located on a first imaginary line L1 that is perpendicular to the top horizontal fold line 26 at the center of the top horizontal fold line 26.

[0094] The positions of the left and right ends 52 and 53 of the second auxiliary fold line 54 are not particularly limited, as long as they are at or above the vertical center of the body panel 8. In the fifth example, the left and right ends 52 and 53 of the second auxiliary fold line 54 are located at the vertical center of the body panel 8, and the ends 52 and 53 are connected to the body vertical fold lines 4 and 5. However, as shown in Figure 18, the left and right ends 52 and 53 of the second auxiliary fold line 54 may be positioned closer to the vertical top horizontal fold line 26 of the body panel 8.

[0095] Furthermore, the upward curve of the upward curved second auxiliary fold line 54 may be a circular arc or an angular arc. In the fifth example, it is formed in a circular arc, but for example, as shown in Figure 19, it may be an angular arc bent in an inverted V shape, or as shown in Figure 20, it may be an angular arc made up of polygons.

[0096] In the fifth example of the paper container 1 formed from the carton blanks 2 configured in this way, the body panel 8 on the opening side, which is connected to the end wall forming panel 24 on the opening side via a top horizontal fold line 26, has upward-curving second auxiliary fold lines 54 formed on or near the body vertical fold lines 4, 5 on both sides of the body panel 8 at or above the vertical center of the body panel 8. Therefore, the sealed opposing surfaces of the outer top seal panels 14, 15 and the inner top seal panel 21 on the end wall forming panel 24 side which becomes the spout 22 are separated, and the pair of gable roof forming panels When the gable wall forming panel 24, which is folded between the flannel 16 and 17, is pulled out, and the body panel 8 is folded in a valley fold from the second auxiliary fold line 54, pressure is applied to both the gable wall forming panel 24 and the body panel 8 from both sides, causing the gable wall forming panel 24 and the body panel 8 to protrude outward and form the spout 22, the body panel 8, which has been folded in a valley fold from the second auxiliary fold line 54, is prevented from returning in the mountain fold direction by the action of the curved portion of the second auxiliary fold line 54, and even when the pressure from both sides of the gable wall forming panel 24 and the body panel 8 is released, the spout 22 formed by the outward protrusion of the gable wall forming panel 24 and the body panel 8 is maintained in a protruding state.

[0097] Furthermore, when the body panel 8 is folded along the second auxiliary fold line 54, the uppermost point T of the second auxiliary fold line 54 is significantly recessed, and the inclination of the protruding side edge of the outwardly protruding spout 22 increases. As a result, the amount of protrusion of the spout 22 increases, making it easier to pour.

[0098] Furthermore, the second auxiliary fold line 54 has its left and right ends 52 and 53 positioned in the vertical center of the body panel 8, and its uppermost point T is located at the center of the top horizontal fold line 26 and on the first imaginary line L1 that is perpendicular to the top horizontal fold line 26. Therefore, the body panel 8 can be easily folded from the second auxiliary fold line 54 without being affected by the bottom of the fixed paper container 1.

[0099] Figures 25 to 30 show a sixth example of an embodiment of the paper container according to the present invention. Figure 25 is a side view of the paper container of the sixth example, showing the opening side. Figure 26 is a partially omitted plan view showing the carton blanks of the paper container shown in Figure 25. Figure 27 is a side view of the paper container shown in Figure 25, showing the gable wall forming panel spread to the left and right, separating the heat-sealed opposing surfaces of the outer top seal panel and the inner top seal panel. Figure 28 is a side view of the paper container shown in Figure 27, showing the connecting side edges of the spread gable roof forming panel and the gable wall forming panel pushed inward from the left and right, pushing the gable wall forming panel away from the gable roof forming panel, opening the spout. Figure 29 is a plan view of Figure 28, and Figure 30 is a front view of Figure 28.

[0100] The paper container 1 in Example 6 is no different in basic configuration from Examples 1 to 5, and the same components as in Examples 1 to 5 will be denoted by the same reference numerals.

[0101] The paper container 1 of the 6th example, like the paper container 1 of the 5th example, has a pair of spout-forming auxiliary fold lines 43 and 44 formed on the opening side end wall forming panel 24 and the opening side body panel 8, on either side of the first imaginary line L1, with a gap between them and extending vertically from the first imaginary line L1.

[0102] In the sixth example, the spout-forming auxiliary fold lines 43 and 44 are spaced further apart from each other as they extend from top to bottom. Also, the upper ends 45 and 46 of the spout-forming auxiliary fold lines 43 and 44 are located at the upper end of the inner top seal panel 21, which is located at the top of the gable wall forming panel 24, similar to the third example. Located The lower ends 47 and 48 are located at the vertical fold lines 4 and 5 on both sides of the body panel 8.

[0103] Although not shown in the diagram, the upper ends 45 and 46 of the spout-forming auxiliary fold lines 43 and 44 may be located at positions that reach the folding fold lines 34 and 35 formed on the gable wall forming panel 24, as in the first example, or at positions that reach the upper end of the gable wall forming panel 24, as in the second example.

[0104] Furthermore, the lower ends 47 and 48 of the spout-forming auxiliary fold lines 43 and 44 are positioned such that the second imaginary line L2 connecting the lower ends 47 and 48 of the spout-forming auxiliary fold lines 43 and 44 is located above the uppermost point T of the second auxiliary fold line 54.

[0105] In the sixth example of the paper container 1 formed from the carton blanks 2 configured in this way, similar to the first to fourth examples, a pair of spout-forming auxiliary fold lines 43 and 44 are formed on the opening side of the gable wall forming panel 24 and the opening side of the body panel 8, on either side of the first imaginary line L1, extending vertically at a distance from the first imaginary line L1. Therefore, similar to the first to fourth examples, when the gable wall forming panel 24, which is folded between the gable roof forming panels 16 and 17, is pulled out, the gable wall forming panel 24 and the body panel 8 are folded in a mountain fold from the spout-forming auxiliary fold lines 43 and 44, making it easy to pull out the gable wall forming panel 24.

[0106] Furthermore, since the spacing between the spout-forming auxiliary fold lines 43 and 44 widens from top to bottom, when the connecting side edges 50 and 51 between the gable roof forming panels 16 and 17 and the gable wall forming panel 24 are pushed inward from the left and right, the gable wall forming panel 24 and the body panel 8 can be easily folded from the spout-forming auxiliary fold lines 43 and 44, making it even easier to push the gable wall forming panel 24 away from the gable roof forming panels 16 and 17.

[0107] Furthermore, the upper ends 45 and 46 of the spout-forming auxiliary fold lines 43 and 44 reach the upper end of the inner top seal panel 21 located on the upper part of the gable wall forming panel 24, similar to the third example, and the lower ends 47 and 48 reach the body vertical fold lines 4 and 5 on both sides of the body panel 8. Therefore, when pulling out the gable wall forming panel 24 which is folded between the gable roof forming panels 16 and 17, the gable wall forming panel 24 and the body panel 8 can be easily folded from the spout-forming auxiliary fold lines 43 and 44 by applying pressure to both sides, thereby facilitating the pulling out of the gable wall forming panel 24 and the body panel 8. The other effects are the same as those in Examples 1 through 5, so we will use the effects from Examples 1 through 5.

[0108] Figures 31 to 36 show a seventh embodiment of the paper container according to the present invention. Figure 31 is a side view of the paper container of the seventh embodiment on the opening side. Figure 32 is a partially omitted plan view showing the carton blanks of the paper container shown in Figure 31. Figure 33 is a side view of the paper container shown in Figure 31 on the opening side, showing the gable wall forming panel spread to the left and right, separating the heat-sealed opposing surfaces of the outer top seal panel and the inner top seal panel. Figure 34 is a side view of the paper container shown in Figure 33 on the opening side, showing the connecting side edges of the spread gable roof forming panel and the gable wall forming panel pushed inward from the left and right, easily pushing the gable wall forming panel away from the gable roof forming panel, and opening the spout. Figure 35 is a plan view of Figure 34. Figure 36 is a front view of Figure 34.

[0109] The paper container 1 in Example 7 is a combination of Example 4 and Example 5, and components identical to those in Example 4 and Example 5 are denoted by the same reference numerals and described accordingly.

[0110] In the seventh example of the paper container 1, the left and right ends 52 and 53 are positioned on or near the vertical fold lines 4 and 5 of the body, which are lower than the lower ends 47 and 48 of the spout-forming auxiliary fold lines 43 and 44 and are located at the vertical center of the vertical fold lines 4 and 5 of the body, or higher than the vertical center of the vertical fold lines 4 and 5, forming an upward-curving second auxiliary fold line 54 whose uppermost point T is on the first imaginary line L1. The uppermost point T of the second auxiliary fold line 54 is positioned so as not to cross the second imaginary line L2 which connects the lower ends 47 and 48 of the spout-forming auxiliary fold lines 43 and 44. The rest of the structure is the same as in the 4th and 5th examples, so we will refer to the explanations in the 4th and 5th examples.

[0111] In the seventh example of the paper container 1, the left and right ends 52, 53 are positioned on or near the body vertical fold lines 4, 5, which are lower than the lower ends 47, 48 of the spout-forming auxiliary fold lines 43, 44 and are located at or above the vertical center of the body vertical fold lines 4, 5, with the uppermost point T on the first imaginary line L1, forming an upward-curving second auxiliary fold line 54. By pushing the connecting side edges 50 and 51 inward from the left and right, and pushing the gable wall forming panel 24 away from the gable roof forming panels 16 and 17, the top corner 49 of the body 13 formed by the top horizontal fold line 26 curves outward from the paper container 1, the body panel 8 makes a mountain fold from the first auxiliary fold line 42 and then a valley fold from the second auxiliary fold line 54, pushing the gable wall forming panel 24 farther away from the gable roof forming panels 16 and 17, and opening the spout 22. As a result of the valley fold of the body panel 8 from the second auxiliary fold line 54, the protrusion of the spout 22 outward from the paper container 1 becomes larger, making it easier to drink.

[0112] Furthermore, the gable wall forming panel 24 and the body panel 8, which are greatly extended away from the gable roof forming panels 16 and 17, increase the outward protrusion of the open spout 22 from the paper container 1, making it easier to drink.

[0113] Furthermore, the expanded gable wall forming panel 24 and the body panel 8 are prevented from returning in the direction of the mountain fold by the portion of the second auxiliary fold line 54 that is valley-folded in the body panel 8, thereby maintaining the shape of the open spout 22.

[0114] Furthermore, since the second auxiliary fold line 54 formed on the body panel 8 is positioned so that its uppermost point T does not exceed the second imaginary line L2 connecting the lower ends 47, 48 of the spout-forming auxiliary fold lines 43, 44, when the connecting side edges 50, 51 of the expanded gable roof forming panels 16, 17 and the gable wall forming panel 24 are pushed inward from the left and right, and the gable wall forming panel 24 is pushed outward from the gable roof forming panels 16, 17, the valley fold from the second auxiliary fold line 54 of the body panel 8 can be easily made. [Explanation of Symbols]

[0115] 1 paper container 2 carton blanks 3,4,5 Vertical fold lines on the torso 6,7,8,9 Body panels 10. Vertical fold lines on the torso 11 Vertical sealing panel 12 Edge 13 Torso 14,15 Outer top seal panel 16,17 Gable roof forming panels 18,19 Top horizontal fold line 20,21 Inner top seal panel 22 Spout 23,24 End wall forming panel 25,26 Top horizontal fold line 27,28 Guide lines 29 First half cut 30 Second Half Cut 31. Spout for straw 32, 33, 34, 35 Folding lines 36,37 Almost triangular surface part 38,39 intersection 40,41 End 42 First auxiliary folding line 43, 44 Spout forming auxiliary folding line 45, 46 Upper end 47, 48 Lower end 49 Top corner 50, 51 Connecting edge portion 52, 53 End portion 54 Second auxiliary folding line 55 Top portion L1 First virtual line L2 Second virtual line U Lowest point T Highest point

Claims

1. A gable-roof type 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 square 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, a folding line is formed on the pair of gable wall forming panels, and the pair of gable wall forming panels are folded in between the pair of gable roof forming panels along the folding line, 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. The opening-side body panel, which is connected to the opening-side end wall forming panel via a top horizontal fold line, has a downward-curving first auxiliary fold line formed on it, with its left and right ends positioned at or near the intersection of the ends of the left and right body vertical fold lines and the left and right ends of the top horizontal fold line, and its lowest point being at the center position of the top horizontal fold line and on a first imaginary line perpendicular to the top horizontal fold line; the opening-side end wall forming panel and the opening-side body panel have a pair of spout-forming auxiliary fold lines formed on either side of the first imaginary line, spaced apart from the first imaginary line, intersecting the top horizontal fold line and extending vertically; the pair of spout-forming auxiliary fold lines are spaced apart from the first imaginary line, with their upper ends positioned on the folding fold line of the opening-side end wall forming panel and their lower ends positioned on the first auxiliary fold line.

2. A gable roof type paper container comprising 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 square 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 being an opening that serves as a spout, a folding line formed on the pair of gable wall forming panels, the pair of gable wall forming panels being folded in between the pair of gable roof forming panels by valley folding along the folding line, and the top being formed by heating and sealing the outer top sealing panel and the inner top sealing panel at a predetermined position, The opening-side body panel, which is connected to the opening-side end wall forming panel via a top horizontal fold line, has a downward-curving first auxiliary fold line formed on it, with its left and right ends positioned at or near the intersection of the ends of the left and right body vertical fold lines of the opening-side body panel and the left and right ends of the top horizontal fold line, and its lowest point being at the center position of the top horizontal fold line and on a first imaginary line perpendicular to the top horizontal fold line; the opening-side end wall forming panel and the opening-side body panel have a pair of spout-forming auxiliary fold lines formed on either side of the first imaginary line, spaced apart from the first imaginary line, intersecting the top horizontal fold line and extending vertically; the pair of spout-forming auxiliary fold lines are spaced apart from the first imaginary line, with their upper ends located at the upper end of the opening-side end wall forming panel and their lower ends located on the first auxiliary fold line.

3. A gable roof type paper container comprising 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 square 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 being an opening that serves as a spout, a folding line formed on the pair of gable wall forming panels, the pair of gable wall forming panels being folded in between the pair of gable roof forming panels by valley folding along the folding line, and the top being formed by heating and sealing the outer top sealing panel and the inner top sealing panel at a predetermined position, The opening-side body panel, which is connected to the opening-side end wall forming panel via a top horizontal fold line, has a downward-curving first auxiliary fold line formed on it, with its left and right ends positioned at or near the intersection of the left and right ends of the top horizontal fold line and the lowest point of which is on a first imaginary line perpendicular to the top horizontal fold line at the center of the top horizontal fold line. The opening-side end wall forming panel and the opening-side body panel have a pair of spout-forming auxiliary fold lines formed on either side of the first imaginary line, spaced apart from the first imaginary line, that intersect the top horizontal fold line and extend vertically. The pair of spout-forming auxiliary fold lines are spaced apart from the first imaginary line, with their upper ends positioned at the upper end of the top seal panel on the upper part of the opening-side end wall forming panel and their lower ends positioned on the first auxiliary fold line.

4. The paper container according to any one of claims 1 to 3, characterized in that the pair of spout-forming auxiliary fold lines are spaced further apart from each other as they extend from top to bottom.

5. The paper container according to claim 4, characterized in that the lower ends of the pair of spout-forming auxiliary fold lines extend beyond the first auxiliary fold line and are located on or near the vertical fold lines of the body panel on both sides of the body panel.

6. The paper container according to claim 5, characterized in that the lower ends of the pair of spout-forming auxiliary fold lines are lower than the lowest point of the first auxiliary fold line and are located at or above the vertical center of the vertical fold line of the body.

Images