JP6926994B2 - Self-supporting thin rectangular parallelepiped carton - Google Patents

Description

The present invention relates to a thin rectangular parallelepiped carton that is highly self-supporting, that is, can be stably self-supporting.

The bottom surface of a thin rectangular parallelepiped carton with a rectangular bottom surface tends to warp outward (downward) in an arc when viewed from the side. When the bottom surface bends outward, the thin rectangular parallelepiped carton naturally tends to fall over on the front or back.

In Patent Documents 1 and 2, in order to prevent the thin rectangular parallelepiped carton from tipping over, notches are provided on the lower edge of the front or back surface, and legs are formed on the front surface and the back surface of the bottom surface so as to project downward. Disclose what you want to do. The formation of the legs stabilizes the carton, but the notches that form the legs make holes in the bottom surface. Moreover, since it is difficult to give high strength to the legs, it is preferable to reduce the number of legs as much as possible.

Japanese Unexamined Patent Publication No. 2006-1631 Japanese Unexamined Patent Publication No. 2001-219929

An object of the present invention is to provide a thin rectangular parallelepiped carton in which the self-sustaining stability is not impaired even if the bottom panel of the thin rectangular parallelepiped carton is warped outward.

It is also an object of the present invention to provide a thin rectangular parallelepiped carton having no holes or small holes on the bottom surface.

Another object of the present invention is to provide a thin rectangular parallelepiped carton having high-strength legs.

In the self-supporting thin rectangular carton according to the present invention, the long side of the rectangular outer bottom panel is on the lower edge of the short side of the rectangular front panel, and the left and right sides of the rectangle narrower than the front panel are on both sides of the long side of the front panel. The long side of the side panel is rectangular on either side edge of the left or right side panel. The long side of the back panel is attached to the lower edge of the short side of the back panel. The long sides of the bottom panel are made from a pattern having a panel configuration in which they are connected to each other, and the first front leg portion is formed by a first notch that enters the outer bottom panel at the lower edge of the front panel. Is formed, and by bending the outer bottom panel inward with respect to the front panel, the front surface is formed by the first front leg portion protruding downward from the lower edge of the front panel, and the tip of the outer bottom panel is formed. It is characterized in that the back surface is supported by the rectangle surface portion. The tip edge of the outer bottom panel includes the tip edge of the outer bottom panel (the edge of the edge opposite to the lower edge of the short side of the front panel to which the outer bottom panel is connected), and is backed by the tip edge. It includes a mode in which the back surface is supported by the surface region extending including the tip edge portion and a mode in which the back surface is supported by the surface region.

The carton, which is made three-dimensionally by folding the paper pattern, exerts a force on the panel to return to the state before it was folded due to the elasticity (repulsive force) of the paper. Since the outer bottom panel that touches the ground plane is folded inward, the outer bottom panel tends to warp outward (downward) after being made into a carton. The force that bends the outer bottom panel outward acts on the boundary between the outer bottom panel and the front panel, and the tip of the outer bottom panel is at the edge (the part away from the lower edge of the front panel (the boundary between the outer bottom panel and the front panel)). It is difficult to transmit the force that bends the outer bottom panel outward. According to the present invention, a first front leg portion is formed in which the front surface of the carton, which tends to warp outward, projects downward, and the front surface is supported by the front surface portion of the carton. On the other hand, on the back surface, the tip of the outer bottom panel is supported by the surface portion. Even if the outer bottom panel warps outward in a range close to the boundary between the outer bottom panel and the front panel, the warp enters the gap between the first front leg and the ground plane. A carton with high self-sustaining stability is provided in which the front surface is supported by the first front leg and the back surface is widely supported by the front end of the outer bottom panel with little or no warping.

In one embodiment, the first front legs are formed on the left and right ends of the lower edge of the front panel, and flaps that can be bent inward are continuous on the lower edges of the left and right side panels. The front ridge is supported by a pair of first front legs on the left and right ends. The holes slightly formed in the outer bottom panel by the first front legs at both left and right ends can be closed (closed) by the flaps connected to the lower edges of the left and right side panels. A thin rectangular parallelepiped carton with no holes in the bottom can be provided.

Preferably, by a second notch that enters the flap at the front edge of the lower edge of the left and right side panels, continuous with the first notch formed at the left and right ends of the lower edge of the front panel. A second front leg portion is formed, and by bending the flap inward with respect to the first front leg portion and the left and right side panels, the front surface of the lower edge of the left and right side panels can be seen from the edge. The front is supported by a second front leg that projects downward. Both the first front leg on the left and right ends of the lower edge of the front panel and the second front leg on the front edge of the lower edge of the left and right side panels provide the front of a self-supporting thin rectangular parallelepiped carton. It can be supported more stably.

Preferably, the first front leg portion formed by the first notch and the second front leg portion formed by the second notch have an inverted trapezoidal shape (a trapezoidal shape in which the lower base is shorter than the upper bottom). The strength of the first and second legs can be increased.

Preferably, inclined fold lines that go up diagonally toward the left and right side panels are formed at both left and right ends of the fold line at the boundary between the front panel and the outer bottom panel, and the above-mentioned inclined fold lines are formed at the ends of the inclined fold lines. The ends of the first notch are connected. When the outer bottom panel is folded inward, the first front leg portion is less likely to be folded inward, and the first front leg portion can be satisfactorily raised (protruded downward). In addition, when the outer bottom panel is folded inward with respect to the front panel, the outer bottom panel in the range close to the inclined fold line is slightly curved inward. This can also reduce the outward warp of the outer bottom panel.

In one embodiment, the lower edges of the left and right side panels have an inclination that rises diagonally from the back to the front. When the outer bottom panel is warped outward, the warping direction is more forward, so that the outer bottom panel is warped in the gap between the outer bottom panel and the ground contact surface formed by the first front leg portion. Can be easily stored, and the curved outer bottom panel can be prevented from being grounded.

It is a pattern for a thin rectangular parallelepiped carton. It is a front view of a thin rectangular parallelepiped carton. It is an enlarged cross-sectional view along the line III-III of FIG. It is a perspective view of a thin rectangular parallelepiped carton seen from the bottom. It is a pattern of a thin rectangular parallelepiped carton of a modified example. It is an enlarged cross-sectional view corresponding to FIG. 3 of the thin rectangular parallelepiped carton of the modification. It is a pattern of a thin rectangular parallelepiped carton of another modification. It is an enlarged cross-sectional view corresponding to FIG. 3 of the thin rectangular parallelepiped carton of another modification.

FIG. 1 shows a development view of a thin rectangular parallelepiped carton. FIG. 2 is a front view of a thin rectangular parallelepiped carton. FIG. 3 shows an enlarged cross-sectional view of the lower part of the thin rectangular parallelepiped carton along the line III-III of FIG. In FIG. 3, the paper thickness is emphasized for the sake of clarity. FIG. 4 is a perspective view of a thin rectangular parallelepiped carton as seen from the bottom surface.

The developed view of FIG. 1 shows a cardboard pattern 1A forming the thin rectangular parallelepiped carton 1B (FIGS. 2 to 4), and is a view of the outer surface when assembled into the thin rectangular parallelepiped carton 1B. The alternate long and short dash line indicates a fold line that is folded into a mountain when assembling the thin rectangular parallelepiped carton 1B. In order to facilitate bending, stencil processing is performed along this alternate long and short dash line. The cardboard is not limited to those made of vegetable fibers, but may be made of synthetic fibers as part or all of the material, or synthetic such as those coated with a synthetic resin film on the surface (or both sides). It may be a thick paper sheet containing a resin.

The thin rectangular parallelepiped carton 1B shown in FIGS. 2 to 4 is produced by bending the pattern 1A that has been die-cut as shown in FIG. 1 and adhering (gluing) the necessary parts.

With reference to FIG. 1, on the paper pattern 1A, a right side panel 11, a front panel 12, a left side panel 13, a back panel 14, and a glue margin panel 15 are arranged side by side. The right side panel 11, the front panel 12, the left side panel 13, the back panel 14, and the glue margin panel 15 are all higher in height (length in the vertical direction) than their width (length in the horizontal direction). It has a rectangular shape.

The outer top panel 21 is connected to the upper edge of the front panel 12, and the inner top panel 22 is connected to the upper edge of the back panel 14. The outer bottom panel 31 is connected to the lower edge of the front panel 12, and the inner bottom panel 32 is connected to the lower edge of the back panel 14. Flaps 41 are connected to the upper and lower edges of the left and right side panels 11 and 13.

At the boundary between the front panel 12 and the outer bottom panel 31 connected to the lower edge thereof, a half-cut line M in which half-cuts formed at intervals are lined up is formed. A half-cut line M is also formed at the boundary between the back panel 14 and the inner bottom panel 32 connected to the lower edge thereof. The half-cut line M is formed to reduce the repulsion (force that the panel tries to return to the posture before folding) when the thick paper is folded. A fold line may be provided between the half-cut lines. Perforations may be formed instead of the half cut.

The half-cut line M at the boundary between the front panel 12 and the outer bottom panel 31 connected to the lower edge thereof is formed in a range excluding the left and right ends of the boundary between the front panel 12 and the outer bottom panel 31, and is half-cut. At each of the left and right ends of the line M, an inclined fold line 51 having an inclination that slightly rises toward the left and right side panels 11 and 13 is formed, and further, the incisions K1 and K2 are continuously formed in the inclined fold line 51. Is formed. The inclined fold line 51 may also be formed by a half cut, or a cut line may be formed on the inclined fold line 51.

The notch K1 is connected to the other end of the inclined folding line 51 whose one end is connected to the left end of the half-cut line M, descends diagonally from there toward the left side panel 13, and changes direction in the middle to be horizontal (horizontal). It extends to the boundary between the front panel 12 and the left panel 13. The notch K2 is connected to the other end of the inclined folding line 51 which is connected to the right end of the half-cut line M, descends diagonally from there toward the right side panel 11, and changes direction in the middle to be horizontal (horizontal). It extends to the boundary between the front panel 12 and the right panel 11.

The cuts K1 and K2 are continuously formed on the left and right side panels 11 and 13, and the cuts K1 and K2 formed on the left and right side panels 11 and 13 are formed on the front panel 12 and the left and right side panels 11 and 13. It extends sideways (horizontally) from the boundary with 13, and changes its direction in the middle to form a slight extension diagonally upward. The border fold lines are connected. The cuts K1 and K2 slightly insert the left and right ends of the lower edge of the front panel 12 into the outer bottom panel 31, and slightly insert the front edge of the lower edge of the left and right side panels 11 and 13 into the flap 41. As will be described later, the inverted trapezoidal front leg portion 60 for stably self-supporting the thin rectangular parallelepiped carton 1B is formed.

The thin rectangular parallelepiped carton 1B is assembled as follows. That is, the pattern 1A is folded at the boundary between the left side panel 13 and the back panel 14, and the boundary between the front panel 12 and the right side panel 11 is also folded. The overlapping glue margin panels 15 and the right side panel 11 are glued together to form a tubular shape, and then the boxes are placed so that the angles between the adjacent panels are at right angles. A square tube with open top and bottom surfaces is created.

Fold the flaps 41 connected to the lower edges of the left and right side panels 11 and 13 at right angles inward, and then fold the inner bottom panel 32 connected to the lower edges of the back panel 14 at right angles inward. Finally, the outer bottom panel 31 connected to the lower edge of the front panel 12 is folded at a right angle inward, and the inner surface of the outer bottom panel 31 and the outer surface of the inner bottom panel 32 are adhered (Fig. 3, the outer bottom panel). The adhesive portion N for adhering 31 and the inner bottom panel 32 is indicated by a thick line). The bottom of the square tube is closed. The adhesive portion N is not provided on the entire surfaces of the outer and inner bottom panels 31 and 32, and there is a range in which the tip of the outer bottom panel 31 and the tip of the inner bottom panel 32 do not have the adhesive portion N.

Contents such as pharmaceuticals, cosmetics, and confectionery are put into the square tube from the upper surface to be opened, and then the upper surface opening is also closed. Similar to the process of closing the lower surface, the flaps 41 on the upper edges of the left and right side panels 11 and 13 are folded at right angles inward, and the inner top panel 22 on the upper edge of the back panel 14 is folded at right angles inward. Finally, the outer top panel 21 on the upper edge of the front panel 12 is folded at a right angle inward, and the inner surface of the outer top panel 21 and the outer surface of the inner top panel 22 are adhered to each other. The top surface of the square tube is closed, and the thin rectangular parallelepiped carton 1B is completed.

When the outer bottom panel 31 is folded inward at a right angle to the front panel 12, the front leg 60 formed by the cuts K1 and K2 is not folded together with the outer bottom panel 31, which causes the front leg 60 to move downward. (The front leg 60 stands up). Similarly, when the flaps 41 continuous to the lower edges of the left and right side panels 11 and 13 are folded at right angles inward, the front legs 60 formed by the cuts K1 and K2 are not folded together with the flaps 41. ， Protrudes downward. The front leg portion 60 is formed in an L shape at both corners (both corners) of the lower edge of the front surface of the thin rectangular parallelepiped carton 1B (see FIG. 4). By forming the front leg 60 into an L shape, the durability against pressure of the guide of the filling machine and vibration during transportation is strengthened, and the front leg 60 can be made hard to be deformed and crushed.

As described above, the front leg portion 60 has an inverted trapezoidal shape and has a hypotenuse. Therefore, especially when the outer bottom panel 31 is folded inward, the pattern paper tends to rub against each other on the hypotenuse. When the outer bottom panel 31 is folded inward at a right angle, the front leg 60 may also bend inward (the front leg 60 does not stand up cleanly). Therefore, as described above, inclined fold lines 51 are formed at both ends of the half-cut line M (fold line) formed at the boundary between the front panel 12 and the outer bottom panel 31, and the ends of the half-cut line M are formed. It is connected to the ends of the cuts K1 and K2 via the inclined folding line 51. As a result, when the outer bottom panel 31 is folded inward at a right angle, the front leg portion 60 is less likely to be folded inward together with it. The inverted trapezoidal front leg 60 can be satisfactorily raised (protruded downward).

Further, referring to FIG. 4, if the inclined fold lines 51 are formed at the left and right ends of the half-cut line M, the outer bottom panel 31 is inclined when the outer bottom panel 31 is folded inward at a right angle to the front panel 12. The outer bottom panel 31 in the range close to the fold line 51 is slightly curved inward (the lightly curved portion is indicated by reference numeral 31A in FIG. 4). As a result, the outward warp of the outer bottom panel 31 can be reduced.

With reference to FIGS. 2, 3 and 4, as described above, the inverted trapezoidal front legs 60 were folded into an L shape at each of the two corners of the front edge of the thin rectangular parallelepiped carton 1B. It protrudes downward in the state. The inverted trapezoidal front leg 60 has relatively high strength, and the front surface of the thin rectangular parallelepiped carton 1B is firmly supported by the front leg 60.

The carton, which is made three-dimensionally by folding the paper pattern, exerts a force on the panel to return to the state before it was folded due to the elasticity (repulsive force) of the paper. With reference to FIG. 3, the outer bottom panel 31 connected to the lower edge of the front panel 12 is made into a carton, and then a force acts outward (downward). An outward (downward) force also acts on the inner bottom panel 32 that is connected to the lower edge of the back panel 14, but since the inner bottom panel 32 is located inside the outer bottom panel 31, it can be grounded directly to the ground plane. do not. Further, since the adhesive portion N is not provided in the area where the tip of the outer bottom panel 31 is located, the outward (downward) force acting on the inner bottom panel 32 is prevented from being transmitted to the outer bottom panel 31 or is difficult to be transmitted. be able to. What should be considered is the outward warp of the outer bottom panel 31, especially the front side of the adhesive portion N.

The force that causes the outer bottom panel 31 to return to the state before it was folded is the force that causes the outer bottom panel 31 to warp outward. Since this force acts on the boundary between the outer bottom panel 31 and the front panel 12, the outward warp of the outer bottom panel 31 becomes gentler as it moves away from the boundary between the outer bottom panel 31 and the front panel 12, and the outer bottom panel 31 There is almost no warping at the tip. The back surface of the thin rectangular parallelepiped carton 1B is firmly supported by the edge portion of the outer bottom panel 31 having almost no warp (the entire surface portion having a predetermined width from the tip of the outer bottom panel 31). However, if the entire outer bottom panel 31 has almost no outward warp, the back surface of the thin rectangular parallelepiped carton 1B is supported by the tip edge of the outer bottom panel 31.

Since the above-mentioned front leg portion 60 is formed so as to project downward from the front surface of the thin rectangular parallelepiped carton 1B, as shown in FIG. 3, the outer bottom panel 31 is formed in a range close to the boundary between the outer bottom panel 31 and the front panel 12. A gap is formed between the ground plane and the ground plane. Even if the outer bottom panel 31 warps downward in a range close to the boundary between the outer bottom panel 31 and the front panel 12, the warped outer bottom panel 31 does not touch the ground, and the front of the thin rectangular parallelepiped carton 1B is the front leg 60. Continues to be firmly supported by. Further, as described above, the back surface of the thin rectangular parallelepiped carton 1B is widely supported by the surface portion at the tip of the outer bottom panel 31 in which the back surface is hardly warped. Even if the outer bottom panel 31 warps downward, the thin rectangular parallelepiped carton 1B does not easily lose its balance and can continue to stand on its own in a stable manner.

FIG. 5 shows a pattern 2A of a thin rectangular parallelepiped carton of a modified example. FIG. 6 shows an enlarged cross-sectional view of a thin rectangular parallelepiped carton 2B made from the paper pattern 2A, which corresponds to FIG. The thin rectangular parallelepiped cartons 1A and 1B shown in FIGS. The cuts K3 and K4 are not formed on the left and right side panels 11 and 13, so the front leg 60A is a point extending downward from the left and right ends of the lower edge of the front panel 12 (left and right sides). The point that it does not have a part extending downward from panels 11 and 13) is different. Further, since the shape of the front leg portion 60A is close to a square and does not have a hypotenuse, the inclined folding line 51 formed at the boundary between the front panel 12 and the outer bottom panel 31 of the above-mentioned thin rectangular parallelepiped cartons 1A and 1B is a thin rectangular parallelepiped carton. It is also different in that it is not formed in 2A and 2B.

With reference to FIG. 6, even in the thin rectangular parallelepiped carton 2B, a gap is formed between the outer bottom panel 31 and the ground contact surface in a range close to the front panel 12, so that the boundary between the front panel 12 and the outer bottom panel 31 is formed. Even if the outer bottom panel 31 warps downward in a close range, the warp range does not touch the ground. The front of the thin rectangular parallelepiped carton 2B can be firmly supported by the front legs 60A. Further, similarly to the above-mentioned thin rectangular parallelepiped carton 1B, the back surface of the thin rectangular parallelepiped carton 2B is firmly supported by the surface portion of the outer bottom panel 31 in which the back surface of the thin rectangular parallelepiped carton 2B hardly warps. Even if the outer bottom panel 31 warps downward, the thin rectangular parallelepiped carton 2B does not easily lose its balance and can continue to stand on its own in a stable manner. Further, since the left and right side panels 11 and 13 and the flap 41 connected to the lower edge thereof are not cut, the front leg portion 60A is formed by the cuts K3 and K4 formed at the left and right ends of the boundary between the front panel 12 and the outer bottom panel 31. The flap 41 can also close the entire small hole on the bottom that is formed by making it.

FIG. 7 shows a pattern 3A of a thin rectangular parallelepiped carton of another modified example. FIG. 8 shows an enlarged cross-sectional view corresponding to FIG. 3 of a thin rectangular parallelepiped carton 3B made from the paper pattern 3A.

In the thin rectangular parallelepiped cartons 2A and 2B shown in FIGS. The difference is that it slopes diagonally upward as it goes toward it.

With reference to FIG. 8, in the thin rectangular parallelepiped carton 3B, the warped outer bottom panel 31 is more likely to warp in the front direction, so that the warped outer bottom panel 31 is difficult to touch the ground. The thin rectangular parallelepiped carton 3B can also be firmly supported by the front leg portion 60A on the front side and by the front end portion of the outer bottom panel 31 on the back side.

1A, 2A, 3A paper pattern 1B, 2B, 3B Thin rectangular parallelepiped carton
11 Right side panel
12 Front panel
13 Left side panel
14 back panel
31 Outer bottom panel
32 Inner bottom panel
41 flap
51 Inclined fold line
60, 60A Front legs K1, K2, K3, K4 Notch L1 Inclined lower edge

Claims (4)

The long side of the rectangular outer bottom panel is on the lower edge of the short side of the rectangular front panel, and the long sides of the left and right side panels of the rectangle narrower than the front panel are on both sides of the long side of the front panel. The long side of the rectangular back panel is connected to any side edge of the side panel, and the long side of the rectangular inner bottom panel bonded to the inner surface of the outer bottom panel is connected to the lower edge of the short side of the back panel. made from paper having a panel configuration that is,
A first front leg portion is formed on the lower edge of the front panel by a first notch that enters the outer bottom panel.
By bending the outer bottom panel inward with respect to the front panel, the front surface is opened by the first front leg portion that protrudes downward from the lower edge of the front panel, and the back surface is formed by the front end portion of the outer bottom panel. my, it is supported, respectively,
The first front leg is formed on the left and right ends of the lower edge of the front panel.
A self-supporting thin rectangular parallelepiped carton with continuous inwardly foldable flaps on the lower edges of the left and right side panels.
A second notch is formed at the front edge of the lower edge of the left and right side panels, and is continuous with the first notch formed at the left and right ends of the lower edge of the front panel, and is inserted into the flap. The front legs are formed,
By the first front leg portion and the second front leg portion in which the front surface of the lower edge of the left and right side panels protrudes downward from the edge portion by bending the flaps inward with respect to the left and right side panels. ， The front is supported by me ，
Self-supporting thin rectangular parallelepiped carton. The first front leg portion formed by the first notch and the second front leg portion formed by the second notch have an inverted trapezoidal shape.
The self-supporting thin rectangular parallelepiped carton according to claim 1. Inclined fold lines that rise diagonally toward the left and right side panels are formed at both left and right ends of the fold line at the boundary between the front panel and the outer bottom panel.
The end of the first notch is connected to the end of the inclined fold line,
The self-supporting thin rectangular parallelepiped carton according to claim 2. The lower edges of the left and right side panels have an inclination that goes up diagonally from the back to the front.
The self-supporting thin rectangular parallelepiped carton according to any one of claims 1 to 3.

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