JP7155555B2 - Self-supporting thin rectangular parallelepiped carton and manufacturing method thereof - Google Patents

Description

TECHNICAL FIELD The present invention relates to a thin rectangular parallelepiped carton that is highly self-supporting and can be stably self-supported, and a method for manufacturing the same.

The bottom surface of a thin rectangular parallelepiped carton having a rectangular bottom surface tends to arc outward (downward) when viewed from the side. When the bottom surface warps outward, the thin rectangular parallelepiped carton tends to fall over on the front side or the back side.

In Patent Document 1, in order to prevent the thin rectangular parallelepiped carton from falling over, a notch is provided at the lower edge of the front or back surface, and legs protruding downward are formed on the front and back sides of the bottom surface. Disclose. By forming the legs, the carton can stand stably on its own, but the cutouts forming the legs create holes in the bottom. Japanese Patent Laid-Open No. 2002-200003 discloses a rectangular bottom plate surface with ruled lines parallel to the short sides to improve the rigidity of the bottom plate surface in order to suppress warpage. However, it is difficult to improve the rigidity enough to overcome the warpage, and it is necessary to use the legs together.

JP-A-2006-1631 Japanese Patent Application Laid-Open No. 2001-219929

SUMMARY OF THE INVENTION An object of the present invention is to reduce or prevent outward warping (warping) of the bottom panel of a thin rectangular parallelepiped carton, thereby improving the self-standing stability of the carton.

The self-supporting thin rectangular parallelepiped carton according to the present invention has a rectangular front panel with a rectangular outer bottom panel on the lower edge of the short side, and a rectangular outer bottom panel on the long side of the front panel. The long sides of the side panels are made from a pattern paper having a panel configuration in which the long sides of the rectangular rear panel are connected to either side edge of the left and right side panels, and the outer bottom surface The panel is characterized in that it is bent or curved inward when viewed from the side.

The invention also provides a method of manufacturing a self-supporting thin rectangular parallelepiped carton. The method for manufacturing a self-supporting thin rectangular parallelepiped carton according to the present invention is such that the long sides of a rectangular outer bottom panel are formed on the lower edges of the short sides of a rectangular front panel, and the long sides of the rectangular outer bottom panel are formed on both sides of the long sides of the front panel. A self-supporting thin rectangular parallelepiped carton made from a paper pattern having a panel configuration in which the long sides of the left and right side panels are connected to either side edge of the left and right side panels and the long side of the rectangular back panel is connected to the long side of the rectangular back panel. In the method of manufacturing the outer bottom panel, by folding the outer bottom panel or pressing a stamping die having a convex surface against the outer surface of the outer bottom panel, the habit of bending or curving inward when viewed from the side is made. It is characterized by attaching to Creasing by folding the outer bottom panel is typically done prior to assembling the carton. Crimping by pressing a die against the outer bottom panel is typically done after the carton is assembled.

The carton, which is made three-dimensionally by folding the paper pattern, exerts a force on the panel to return to the state before folding due to the elasticity (repulsive force) of the paper. Since the outer bottom panel connected to the front panel is folded inward, the outer bottom panel tends to warp due to an outward force. According to this invention, since the outer bottom panel has a habit of bending or curving inward when viewed from the side, even if the outer bottom panel warps outward to some extent, the grounding point (under the front panel) edge and bottom edge of the rear panel). It is possible to reduce or prevent outward warping (warping) of the bottom panel of the thin rectangular parallelepiped carton, and to stabilize the thin rectangular parallelepiped carton on its own.

The preformed kink in the outer bottom panel may be an inwardly bent surface (valley fold) or an inwardly curved surface. When the outer bottom panel is formed with an inwardly curved curved surface, the outer bottom panel is preferably formed with a first fold line extending in the longitudinal direction. The outer bottom panel is inwardly bent (valley fold) along the first fold line.

In one embodiment, the outer bottom panel is further formed with second fold lines that obliquely connect the four corners of the outer bottom panel and the first fold lines on the left and right sides of the outer bottom panel. The outer bottom panel is bent inwardly along the first fold line and the second fold line. A central portion of the outer bottom panel is inwardly recessed along the first fold line and the second fold line.

Preferably, the lower edges of the left and right side panels are bent or curved toward the upper edges of the side panels. The left and right edges of the outer bottom panel, which are bent or curved inward (dented), are less likely to interfere with the left and right side panels (especially their lower edges), so the entire outer bottom panel has a solid interior. Orientation can be added.

In one embodiment, the long side of the rectangular inner bottom panel is connected to the lower edge of the short side of the rear panel, and the inner bottom panel is also bent or curved inward. It is also possible to reduce outward warping of the inner bottom panel.

The inner bottom panel does not necessarily have to bend or curve inward, but if it does not have a habit, the inner bottom panel is bent or curved inward. It is preferable to form a notch to avoid interference with the bottom panel. The outer bottom panel can be fully flexed or curved inwardly.

FIG. 2 is an exploded view of the thin rectangular parallelepiped carton of the first embodiment; It is a perspective view which shows the mode of assembly of the thin rectangular parallelepiped carton of 1st Example. It is a perspective view of the thin rectangular parallelepiped carton of 1st Example. FIG. 10 is an exploded view of the thin rectangular parallelepiped carton of the second embodiment; It is a perspective view which shows the thin rectangular parallelepiped carton of 2nd Example, and a part of box-making apparatus. FIG. 11 is an exploded view of a thin rectangular parallelepiped carton of the third embodiment; FIG. 11 is a perspective view of a thin rectangular parallelepiped carton of the third embodiment; FIG. 11 is an exploded view of a thin rectangular parallelepiped carton of the fourth embodiment; It is a perspective view of the thin rectangular parallelepiped carton of 4th Example. FIG. 11 is a developed view of a thin rectangular parallelepiped carton of a modified example of the fourth embodiment;

Hereinafter, the thin rectangular parallelepiped carton according to the present invention will be described in detail.

FIG. 1 shows a developed view of a thin rectangular parallelepiped carton of the first embodiment. FIG. 2 is a perspective view of the state of assembly of the thin rectangular parallelepiped carton of the first embodiment, seen from the bottom. FIG. 3 is a perspective view of the thin rectangular parallelepiped carton of the first embodiment seen from the bottom.

FIG. 1 shows a cardboard template (exploded view) for forming the thin rectangular parallelepiped carton 1, and is a view of the outer surface when the thin rectangular parallelepiped carton 1 is assembled. A dashed line indicates a folding line for assembling the thin rectangular parallelepiped carton 1 . In order to facilitate folding, crease processing, half-cutting, formation of perforations, etc. are performed along the dashed-dotted lines.

Referring to FIG. 1, a right side panel 11, a front panel 12, a left side panel 13, a rear panel 14 and an adhesive margin panel 15 are arranged sideways. The right side panel 11, the front panel 12, the left side panel 13, the back panel 14, and the margin panel 15 are all taller than their width (horizontal length). It has an oriented rectangular shape.

An outer top panel 21 is connected to the upper edge of the front panel 12 , and an inner top panel 22 is connected to the upper edge of the rear panel 14 . An outer bottom panel 31 is connected to the lower edge of the front panel 12, and an inner bottom panel 32 is connected to the lower edge of the rear panel . The outer top panel 21, the inner top panel 22, the outer bottom panel 31, and the inner top panel 32 have a horizontal rectangular shape. Further, flaps 41 are connected to the upper and lower edges of the left and right side panels 11 and 13, respectively.

Each of the outer bottom panel 31 and the inner bottom panel 32 is formed with a longitudinally extending fold line 51 that approximately bisects the panels 31,32.

The thin rectangular parallelepiped carton 1 is assembled as follows. That is, the paper pattern is folded at the boundary between the left side panel 13 and the rear panel 14, and the boundary between the front panel 12 and the right side panel is also folded. The overlapped margin panel 15 and the right side panel 11 are adhered to form a cylindrical shape, and then the adjacent panels are erected so that the angle between them is a right angle. A square cylinder with open top and bottom surfaces is made.

2 and 3, the flaps 41 connected to the upper edges of the left and right side panels 11 and 13 are folded inward at right angles. The inner top panel 22 on the upper edge of the rear panel 14 is folded inward at a right angle. Finally, the outer top panel 21 on the upper edge of the front panel 12 is folded inward at a right angle, and the inner surface of the outer top panel 21 and the outer surface of the inner top panel 22 are adhered. The top surface (upper surface) of the rectangular tube is closed.

Contents such as medicines, cosmetics, sweets, etc. are put into the rectangular tube through the bottom surface (lower surface) of the opening, and then the bottom opening is closed. The flaps 41 on the lower edges of the left and right side panels 11, 13 are folded inward at right angles. Next, the inner bottom panel 31 connected to the lower edge of the front panel 12 and the outer bottom panel 32 connected to the lower edge of the rear panel 14 are folded outward along the folding lines 51 (reverse folding). ), make a habit. Finally, the inner bottom panel 32 connected to the lower edge of the rear panel 14 is folded inward at a right angle, the outer bottom panel 31 connected to the lower edge of the front panel 12 is folded inward at a right angle, and the outer bottom panel The inner surface of the panel 31 and the outer surface of the inner bottom panel 32 are glued together. The bottom surface of the square tube is closed to complete the thin rectangular parallelepiped carton 1 (Fig. 3).

Referring to FIG. 3, the outer and inner bottom panels 31 and 32 are pre-folded by folding the outer and inner bottom panels 31 and 32 outward along the fold lines 51 as described above. Therefore, the outer and inner bottom panels 31 and 32 of the completed thin rectangular parallelepiped carton 1 have a concave shape bent inward at an obtuse angle when viewed from the side, forming an oblique side with the fold line 51 as the top.

The carton, which is made three-dimensionally by folding the paper pattern, exerts a force on the panel that tries to return to the state before it was folded due to the elasticity (repulsive force) of the paper. Since the outer bottom panel 31 connected to the lower edge of the front panel 12 is folded inward, an outward force is generated. Since the inner bottom panel 32 connected to the lower edge of the rear panel 14 is also folded inward, an outward force is generated. The outward force acts on the boundary between the front panel 12 and the outer bottom panel 31 and between the rear panel 14 and the inner bottom panel 32 . Since the outer and inner bottom panels 31, 32 are glued together, they tend to bend outward (downward) when viewed from the side.

Here, since the outer and inner bottom panels 31 and 32 are previously folded along the folding lines 51 as described above, the inner and outer bottom panels 31 and 32 are pre-formed with creases that dent inward. Even if 32 warps outward to some extent, it is difficult to protrude outward beyond the grounding points (the lower edge of the front panel 12 and the lower edge of the rear panel 14). There is no

In addition, since the thin rectangular parallelepiped carton 1 does not use cuts to form the legs, there are no gaps (holes) due to the cuts, and dust can be prevented from entering the carton 1 .

4 and 5 show the second embodiment. FIG. 4 shows the cardboard pattern for forming the thin rectangular parallelepiped carton of the second embodiment, and FIG. 1A and 1B respectively show perspective views schematically showing a part of the box-making apparatus. The thin rectangular parallelepiped carton 1 of the first embodiment shown in FIGS. It is different in that it is bent toward the upper edge of 13. In addition, in the first embodiment, the outer and inner bottom panels 31 and 32 are preliminarily folded in reverse along the folding line 51 before being glued together. After forming the carton into a rectangular parallelepiped (before the adhesive hardens after bonding the outer and inner bottom panels 31 and 32), fold the outer and inner bottom panels 31 and 32 toward the inside of the carton. It is different in that it is bent along 51, thereby giving the outer and inner bottom panels 31, 32 an inwardly directed kink. This also applies to other embodiments described below.

In the box making device for making the thin rectangular parallelepiped carton 2 from the paper pattern, the thin rectangular parallelepiped carton 2 moves laterally on the rail 61 . When the outer and inner bottom panels 31 and 32 are bent inward, a pressing plate (push die) 63 is pressed against the outer surface of the outer bottom panel 31 . In order to prevent the carton 2 from moving when the pressing plate 63 is pressed, the box making device is provided with a stopper 62 which is driven to move up and down.

The pressing plate 63 has a bent surface with a mountain-shaped cross section, and the bent surface (convex surface) is pressed against the outer surface of the outer bottom panel 31, so that the outer and inner bottom panels 31 and 32 are bent inward along the folding line 51. It has a habit of being taken. In the thin rectangular parallelepiped carton 2 of the second embodiment, the lower edges of the side panels 11 and 13 (folding line 53 at the boundary between the side panels 11 and 13 and the flap 41 connected to these lower edges) , 13 so that the outer and inner bottom panels 31, 32 bent inward along the fold lines 51 are not obstructed by the side panels 11, 13. The entire outer and inner bottom panels 31 , 32 can be rigidly bent inward along fold lines 51 .

The shape of the pressing die and the pressing method are not limited to this, and for example, the edge of a disk-shaped pressing die may be pressed against the bottom panel and rotated in synchronization with the movement of the carton. Alternatively, the carton may be moved intermittently so that the abutment member is pushed into the bottom panel when stopped. The key is to apply internal stress to the bottom panel before the glue hardens to suppress the repulsion that expands outward.

6 and 7 show the third embodiment, FIG. 6 shows a cardboard template for forming the thin rectangular parallelepiped carton of the third embodiment, and FIG. 4A and 4B each show a perspective view from the bottom up. The fold line 51 is not formed on the outer and inner bottom panels 31 and 32, and the outer and inner bottom panels 31 and 32 are curved and bent inward. It is different from the thin rectangular parallelepiped carton 2 of the second embodiment which is bent inward at an obtuse angle along the . In addition, the lower edges of the side panels 11, 13 (folding line 55 at the boundary between the side panels 11, 13 and the flap 41 connected to the lower edges of the side panels 11, 13) are curved toward the upper edges of the side panels 11, 13. It is also different from the fold line 53 of the second embodiment, which is formed by bending.

In the third embodiment as well, the outer and inner bottom panels 31 and 32 are bent inward by pressing a pressing plate (not shown) against the outer and inner bottom panels 31 and 32 . The outer and inner bottom panels 31 and 32 can be made to curve inward by pressing a pressing plate having an outwardly projecting curved surface against the outer bottom panel 31 . Since the lower edges of the side panels 11, 13 (folding line 55 at the boundary between the side panels 11, 13 and the flap 41 connected to the lower edges of the side panels 11, 13) are curved toward the side panels 11, 13, The outer and inner bottom panels 31 and 32 that are curved and bent inward are not obstructed by the side panels 11 and 13, and the entirety of the outer and inner bottom panels 31 and 32 are firmly curved inward. can be done.

8 and 9 show the fourth embodiment. FIG. 8 shows a cardboard template for forming the thin rectangular parallelepiped carton of the fourth embodiment, and FIG. 9 shows the completed thin rectangular parallelepiped carton of the fourth embodiment. 4A and 4B each show a perspective view from the bottom up.

In addition to the fold lines 51 extending in the longitudinal direction, fold lines 57 obliquely connecting the four corners of the panels 31 and 32 to the fold lines 51 are formed on the left and right sides of the outer and inner bottom panels 31 and 32, respectively. It differs from the thin rectangular parallelepiped carton 1 (FIG. 1) of the first embodiment in that

Since diagonal folding lines 57 are formed to connect the four corners of the outer and inner bottom panels 31 and 32 with the folding lines 51, the central portions of the outer and inner bottom panels 31 and 32 are recessed so that the thin rectangular parallelepiped carton 4 can be formed. can be given to

When forming the diagonal fold line 57, the fold line 51 formed in the longitudinal direction of the outer and inner bottom panels 31 and 32 extends to the left and right side edges of the outer and inner bottom panels 31 and 32 (from end to end). It may be formed only up to the vicinity of both side edges without forming up to). Not only the lower edge of the front panel 12 and the lower edge of the rear panel 14, but also the lower edges of the left and right side panels 11 and 13 can be used for grounding.

The oblique folding lines 57 may be formed at least on the outer bottom panel 31 and are not necessarily formed on the inner bottom panel 32 . Also, the inner bottom panel 32 may be cut out so as not to interfere with the outer bottom panel 31 which is bent inward. FIG. 10 shows a developed view of a modified thin rectangular parallelepiped carton 5 in which a notch 71 is formed in the inner bottom panel 32. As shown in FIG. The size of the notch 71 is formed so as to leave a range necessary for bonding the outer bottom panel 31 and the inner bottom panel 32 together. The outer bottom panel 31 can be fully flexed or curved inward.

1,2,3,4,5 thin cuboid carton
11 Right side panel
12 Front panel
13 Left side panel
14 Rear panel
31 Outer bottom panel
32 Inner bottom panel
51, 53, 55, 57 folding lines
71 Notch

Claims (5)

The long sides of the rectangular outer bottom panel are placed on the lower edges of the short sides of the rectangular front panel, and the long sides of the left and right rectangular side panels narrower than the front panel are placed on both sides of the long sides of the front panel. A self-supporting thin rectangular parallelepiped carton made from a paper pattern having a panel configuration in which the long sides of a rectangular rear panel are connected to either side edge of the side panels, respectively, comprising:
a first longitudinally extending fold line is formed in the outer bottom panel;
second folding lines obliquely connecting the four corners of the outer bottom panel and the first folding lines are further formed on the left and right side portions of the outer bottom panel, respectively;
The outer bottom panel is bent inward when viewed from the side along the first fold line and the second fold line, and when the pattern paper is assembled, the outer bottom panel is bent inward. A slope with the fold line 1 as the top is formed ,
Self-standing thin rectangular parallelepiped carton. the lower edges of the left and right side panels are bent toward the upper edges of the side panels;
The self-supporting thin rectangular parallelepiped carton according to claim 1. The long side of the rectangular inner bottom panel is connected to the lower edge of the short side of the back panel, and the inner bottom panel is also bent inward.
The self-supporting thin rectangular parallelepiped carton according to claim 1. The long side of the rectangular inner bottom panel is connected to the lower edge of the short side of the rear panel,
The inner bottom panel is formed with a notch that avoids interference with the outer bottom panel that is bent inward,
The self-supporting thin rectangular parallelepiped carton according to claim 1. The long sides of the rectangular outer bottom panel are placed on the lower edges of the short sides of the rectangular front panel, and the long sides of the left and right rectangular side panels narrower than the front panel are placed on both sides of the long sides of the front panel. 1. A method for manufacturing a self-supporting thin rectangular parallelepiped carton made from a paper pattern having a panel configuration in which the long sides of a rectangular rear panel are connected to either side edge of a side panel, respectively, comprising the steps of:
a first longitudinally extending fold line is formed in the outer bottom panel;
second folding lines obliquely connecting the four corners of the outer bottom panel and the first folding lines are further formed on the left and right side portions of the outer bottom panel, respectively;
By folding the outer bottom panel along the first fold line and the second fold line, the outer bottom panel is bent inward when viewed from the side, and the first fold is attached to the outer bottom panel. form a slope whose top is the fold line of
A method for manufacturing a self-supporting thin rectangular parallelepiped carton.

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