JP2013136412A - Corrugated cardboard carton - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a corrugated cardboard carton that dispenses with a separate member for reinforcement, and whose sidewall board is neither buckled nor trunk swollen even if bags filled with liquid, etc. are stored and these several bags are piled up.SOLUTION: The corrugated cardboard carton including a cylindrical body 10 where mutually opposed sidewall boards 2 are connected to each other, and flaps that are continuously provided from both sides of the sidewall boards 2 to close openings of its cylindrical body, wherein a functional area G formed by a doubly folded part that is extended in two row at positions that are spaced out upwardly and downwardly from a border of the cylindrical body 10 and flaps is provided at a horizontally folded part Q provided between the cylindrical body 10 and at least the flap that closes the upper opening, is provided.

Description

  The present invention relates to a corrugated cardboard box including a cylindrical main body in which side wall plates opposed to each other are connected, and a flap connected from both ends of the side wall plate to close an opening of the cylindrical main body.

  As prior art document information related to this type of cardboard box, there is Patent Document 1 shown below. The cardboard box described in Patent Document 1 is provided with a low-rigid bag made of resin or the like, filled with liquid inside the bag, and the cardboard boxes filled with liquid in such a manner are moved up and down. It is also assumed to be used in such a manner that it is transported or stored in a stacked state.

  Patent Document 1 discloses that in such a usage pattern, the middle of the side wall plate swells outwardly due to the action of the weight of the filling liquid, and in particular, the lower cardboard box becomes the upper cardboard when stacked in several stages. The problem of collapsing by receiving a load from is considered as a solution.

  In order to solve this problem, Patent Document 1 has a configuration in which a reinforcing quadrangular corrugated cardboard belt member covering the outer peripheral surface in the middle in the vertical direction of the bag is disposed inside the cardboard box.

JP 2000-72177 A (paragraph 00, FIG. 2)

  However, in the corrugated cardboard box described in Patent Document 1, there is a problem that the cost of the corrugated cardboard box is inevitably increased because it is necessary to provide a quadrangular annular corrugated belt member as a separate member for reinforcement.

  Further, in the corrugated cardboard box described in Patent Document 1, even when the middle swelling of the side wall plate due to the weight of the liquid can be prevented by the quadrangular annular corrugated belt member, when the corrugated cardboard boxes are stacked in several stages, In particular, the side wall plate is likely to buckle at a portion that is not supported by the corrugated cardboard band member, and there is a possibility that the stacked cardboard boxes may collapse due to uneven buckling occurring in the four side wall plates.

  Therefore, in view of the problems given by the cardboard box according to the prior art exemplified above, the object of the present invention is not to require a separate member for reinforcement, and further, the cardboard box is stored in several stages by storing a bag filled with liquid. It is another object of the present invention to provide a cardboard box in which the side wall plate is hardly buckled and swollen even when stacked.

The first characteristic configuration of the cardboard box according to the present invention is:
A cylindrical main body connected to opposite side wall plates, and a flap connected from both ends of the side wall plate to close the opening of the cylindrical main body,
Two laterally extending portions provided between the cylindrical main body and the flap that closes at least the upper opening are extended in two rows at positions spaced vertically from the boundary between the cylindrical main body and the flap. It is in the point where the heavy bending part is provided.

  In the corrugated cardboard box according to the above characteristic configuration, the laterally bent portion provided between the cylindrical main body and the flap that closes at least the upper opening is formed in two rows at positions spaced from the boundary line between the cylindrical main body and the flap. Since the double folded portion is provided, when the upper flap is folded inward with respect to the side wall plate to assemble the cardboard box, the region surrounded by the double folded portion becomes the upper flap and the side wall plate. Due to the pulling force from both of them, an inclined region inclined with respect to both the cylindrical main body extending in the vertical direction and the upper flap extending in the horizontal direction is formed.

  Since such an inclined region is formed, the left and right central portions of the double-folded portion corresponding to the inner boundary of the inclined surface are uniformly extruded toward the outside of the cardboard box. A straight vertical ridge line extending downward from the left and right central portion of the double bent portion is formed. Due to the action of the vertical ridges generated in this way, the cardboard box is provided with a side wall plate that has a high buckling resistance especially against pressure from the vertical direction. It is obtained without using a separate member.

  Another characteristic configuration of the present invention is that the lateral bent portion includes two double bent portions arranged side by side along the boundary line.

  If it is this structure, when a flap is bent inside with respect to a side wall board along a horizontal bending part, two inclination area | regions arranged side by side will be formed in a side wall board. As a result, since two vertical ridgelines spaced apart from each other on the left and right sides are formed on the side wall plate, at least the upper horizontal section of the cylindrical body formed by the side wall plate exhibits a dodecagon, A cardboard box having a particularly high buckling resistance against pressure is obtained.

  According to another characteristic configuration of the present invention, the lateral folding portion includes a pair of single-line folding portions that extend in a row from the left and right end portions of the flap, and the double folding portion disposed between the pair of single-wire folding portions. The point is that it has a part.

  In this configuration, compared to a configuration in which one end of the double bent portion is located at both left and right end portions of the flap, at least a sharp ridge line is not generated in the corner portion of the cardboard box. It is maintained and an excellent appearance is easily obtained.

  Another characteristic configuration of the present invention is that a double bent portion facing the upper double bent portion is also formed in a horizontal bent portion provided between the cylindrical main body and the flap closing the lower opening. Is in the point provided.

  In this configuration, when the upper and lower flaps are bent inward with respect to the side wall plate, inclined regions are formed on the upper and lower sides of the side wall plate, so that a vertical ridge line extending vertically is generated symmetrically with respect to the vertical center of the side wall plate. Therefore, a cardboard box having a high buckling resistance against pressure from the vertical direction can be obtained.

  Another feature of the present invention is that the side wall plate is provided with a pair of auxiliary bent portions extending laterally and spaced apart from the upper and lower double bent portions inward in the vertical direction.

  With this configuration, a bulging region having a relatively clear rectangle surrounded by a pair of left and right vertical ridge lines and a pair of upper and lower auxiliary bent portions is formed in the vicinity of the center portion of the side wall plate in the vertical and horizontal directions. In addition, the cross-sectional shape and length of the vertical ridge lines are likely to be uniform among the plurality of side wall plates. As a result, it is possible to obtain a corrugated cardboard box that has an excellent appearance and is not easily collapsed even when stacked in many stages.

  According to another characteristic configuration of the present invention, the flap includes an inner flap disposed inside a box and an outer flap disposed outside, and a lateral bent portion between the inner flap and the side wall plate includes the outer flap. It is in the point which is displaced and arrange | positioned inside the up-down direction compared with the horizontal bending part between the said side wall board.

  With this configuration, the flaps adjacent to each other are prevented from interfering with each other at the corner during assembly. That is, if the two inner flaps are folded inward, and then the two outer flaps are folded inward, then the problem of distortion in the corners and the pair of flaps that were folded earlier folded later. The problem of being flipped up by the pair of flaps so that a part of the interior bag to be stored is sandwiched between the tips of the flaps can be avoided.

It is an external appearance perspective view which shows the use condition of the cardboard box which concerns on this invention. It is an external appearance perspective view which shows another use condition of the cardboard box which concerns on this invention. It is explanatory drawing which shows the state which expand | deployed the cardboard box based on this invention. It is explanatory drawing which shows the external appearance which looked at the cardboard box which concerns on this invention from the upper direction and the front. It is sectional drawing which shows the state which loaded the cardboard box which concerns on this invention. It is explanatory drawing which shows another embodiment of a side bending part.

EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated, referring drawings.
The cardboard box 1 according to the present invention can be used as a bag-in box for storing an interior bag 20 filled with a liquid or the like, as illustrated in FIG. The object is not limited to this.

FIG. 2A shows a state of the corrugated cardboard box 1 in which the interior bag 20 filled with liquid or the like is housed and closed for the purpose of transportation or storage.
FIG. 2B shows a state in which the liquid outlet 20A of the interior bag 20 is exposed from the opening 1H formed by cutting the upper flap cutout 1A of the closed cardboard box 1. FIG.

FIG. 3 shows a development view before the cardboard box 1 is assembled.
As shown in FIG. 3, the corrugated cardboard box 1 includes four side wall plates 2 (2A, 2B, 2C, 2D) connected laterally to each other, and four lower flaps 3 connected from the lower end of each side wall plate 2 ( 3A, 3B, 3C, 3D), four upper flaps 4 (4A, 4B, 4C, 5D) connected from the upper end of the side wall plate 2, and a connection connected sideways from the leftmost side wall plate 2A. And a plate 5.

Between the four side wall plates 2 and between the leftmost first side wall plate 2 </ b> A and the connecting plate 5, a vertically bent portion P extending in the vertical direction in a row is formed.
When the side wall plates 2 adjacent to each other are folded along the respective vertical folding portions P so that the paper surface of FIG. 1 is on the outer side, and the connecting plate 5 is glued inside the rightmost fourth side wall plate 2D, four side walls are obtained. The plate 2 forms a cylindrical main body 10 having upper and lower rectangular cross-sectional openings.

Between the four side wall plates 2 and the four lower flaps 3, and between the four side wall plates 2 and the four upper flaps 4, a laterally bent portion Q extending in a lateral direction is formed.
When each lower flap 3 is bent along the laterally bent portion Q with respect to the side wall plate 2 adjacent above, the lower opening of the cylindrical body 10 is closed, and each upper flap 4 is adjacent to the side wall plate 2 adjacent below. On the other hand, when it is bent along the laterally bent portion Q, the upper opening of the cylindrical main body 10 is closed.

As illustrated in FIG. 3, the horizontal bent portion Q includes three single-line bent portions 6 (6L, 6R) extending in a row in the horizontal direction and two double bent portions extending in two rows in the horizontal direction. (7L, 7R, 8L, 8R).
The single-line bent portion 6 includes a left single-line bent portion 6L extending in a line from the left end of each flap 3, 4 to the inside (right side), and an inner side (left side) from the right end of each flap 3, 4. It has a right single line bent part 6R extending in a line toward the center and a central single line bent part 6C located between the left and right double bent parts 7 and 8.

The double bent portions 7 and 8 are a circular double circle that protrudes outward between the lower double bent portion 7 that extends in an arc shape protruding inward between the left and right single wire bent portions 6 and the left and right single wire bent portions 6. And an upper double bent portion 8 extending in an arc shape.
If a virtual boundary line T (an example of a boundary line) extending linearly along the boundary between the cylindrical main body 2 and the upper and lower flaps 3 and 4 is set, the lower double bent portion 7 and the upper two are shown in the developed view. The heavy bent portion 8 extends at a position that is equally spaced vertically from the virtual boundary line T so as to have a vertically symmetrical shape with respect to the virtual boundary line T.

The lower double bent portion 7 and the upper double bent portion 8 that face each other in the vertical direction cooperate with each other to form a convex lens-shaped functional region G that swells evenly in the vertical direction. Two functional regions G are arranged side by side along the virtual boundary T. The ratio of the width L1 along the virtual boundary T of the functional region G to the vertical width L2, ie, L1 / L2, is set to about 3.0 in the figure, but the ratio is 1.0 to 10.0. It may be within the range.
Further, the ratio of the width L1 along the virtual boundary line T of the region to the length L3 of each of the independent single-line bent portions 6L, 6C, 6R, that is, L1 / L3 is set to about 2.0 in the figure. The ratio should just be in the range of 1.0-3.5.

In addition, a part of each side wall plate 2 is provided with a pair of auxiliary lateral bent portions R (an example of the auxiliary bent portions) that extend laterally and are spaced apart from each other.
As shown in FIG. 3, the auxiliary lateral bent portion R is at a vertical position that is a predetermined distance inward from the upper and lower horizontal bent portions Q, and is located in front of the vertical bent portion P from the lateral center of each side wall plate 2. It extends to the position. An imaginary line (not shown) extending in parallel with the vertical bent portion P from the left and right ends of the auxiliary lateral bent portion R passes near the center of the left and right functional regions G.

In the vicinity of the center of the third upper flap 4C, a circular cutout 1A for forming the opening 1H described above is formed as necessary. The cut-out portion 1A is made of an annular cut-out line K composed of a sewing machine line or the like.
The corrugated cardboard box 1 is composed of one or two layers of corrugated cardboard. The corrugated corrugated core corrugated cross section bonded between the front and back paper liners constituting the layer is a flap 3, 4 is used in the direction seen at both upper and lower ends.

The unassembled corrugated cardboard shown in FIG. 3 is folded only at two appropriate vertical folding portions P, and only the two portions of the connecting plate 5 and the rightmost fourth side wall plate 2D are glued together. It is also possible to store it in a state.
When assembling the corrugated cardboard box 1 in the usage form from the state where only the connecting plate 5 and the rightmost fourth side wall plate 2D are glued to each other, first, a cylindrical shape provided with openings vertically by the four side wall plates 2 The main body 10 is made, and then the lower flap 3 is folded inward along the lateral folding portion Q in order to close the lower opening.

  In addition, as illustrated in the partially enlarged view of FIG. 3, the virtual boundary line T1 and the laterally bent portion Q of the second lower flap 3B and the fourth lower flap 3D are the virtual boundaries of the first lower flap 3A and the third lower flap 3C. It is formed about 2 to 5 mm inside from the boundary line T2 and the lateral bent portion Q. The upper flap 4 has the same configuration. This eliminates that the flaps 3 (4) adjacent to each other interfere with each other at the corner during assembly.

  That is, first, if the second lower flap 3B and the fourth lower flap 3D (an example of the inner flap) are bent inward, then the first lower flap 3A and the third lower flap 3C (an example of the outer flap) are bent, Problems such as distortion at the corners, and problems such as the pair of lower flaps 3 bent earlier are flipped up by the pair of lower flaps 3 bent later are avoided.

  The pair of first lower flap 3A and third lower flap 3C bent afterward are connected by melt bonding, adhesive tape, or the like. The cardboard box 1 shown in FIG. 1 is in a state in which the interconnection of the first lower flap 3A and the third lower flap 3C is completed.

  FIG. 2A shows a cardboard box 1 in which the inner bag 20 filled with liquid or the like is stored in the cardboard box 1 with the lower flap 3 closed, and then the upper opening of the cylindrical body 10 is closed with the upper flap 4. The appearance of is shown. Also for the upper flap 4, first, the second upper flap 4B and the fourth upper flap 4D are bent inward toward the upper surface of the interior bag 20, and then the first upper flap 4A and the third upper flap 4C are bent. The second upper flap 4B and the fourth upper flap 4D are bent inward toward the upper surfaces.

As shown in FIGS. 2A and 4, when the flaps 3, 4 are bent inward so as to be generally perpendicular to the side wall plates 2, the double bent portions 7, The functional region G surrounded by 8 is a curved inclined surface inclined substantially equally with respect to both the longitudinally folded portion P and the laterally folded portion Q by the pulling force from both the flaps 3 and 4 and the side wall plate 2. F (an example of an inclined region) is formed.
Since the curved inclined surface F has a three-dimensional shape formed of a part of a sphere instead of a part of a cylindrical body, more specifically, a partially spherical three-dimensional shape protruding toward the center of the cardboard box 1, High strength against external force from an angle.

Since the curved inclined surface F having such a high strength is formed to be inclined with respect to the vertical direction, the left and right central portions of the double bent portion 7 corresponding to the inner boundary of the curved inclined surface F are the corrugated cardboard box 1. It is extruded evenly toward the outside.
As a result, each side wall plate 2 is formed with a pair of straight vertical ridges VP spaced from each other to the left and right so as to connect the left and right central portions of the double bent portion 7 that are present at two locations in the vertical direction. The

  As can be understood from FIG. 4A, when the corrugated cardboard box 1 with the upper and lower flaps 3 and 4 closed by the longitudinal ridge line VP that divides each side wall plate 2 into approximately three parts, It has a cross-sectional shape. By such an action of the vertical ridge line VP, a corrugated cardboard box 1 having a side wall plate 2 having a high buckling resistance especially against pressure from the vertical direction can be obtained.

In particular, in the present embodiment, each side wall plate 2 is formed with upper and lower auxiliary horizontal bent portions R having bent ridges protruding outward, so that the upper and lower auxiliary horizontal bent portions are formed due to the formation of the vertical ridge line VP. A lateral ridge line VH extending along the portion R is also formed.
As a result, a rectangular region surrounded by the pair of left and right vertical ridge lines VP and the pair of upper and lower horizontal ridge lines VH forms a rectangular bulge region W that protrudes outward at the center of the upper, lower, left, and right sides of each side wall plate 2. To do.
In addition, the upper and lower inner portions of the curved inclined surface F or the region between the laterally bent portion Q and the rectangular bulging region W is inclined and connected at an intermediate angle between the vertical rectangular bulging region W and the curved inclined surface F. Part J is formed.

Since the central portion of each side wall plate 2 becomes a rectangular bulge region W and is forced to be pushed outward as described above, a uniform tension is generated on substantially the entire surface of each side wall plate 2. The buckling resistance against pressure from other directions is also increased.
Moreover, by having the rectangular bulging area | region W which protrudes outside in the center part of the upper and lower sides, and right and left of each side wall board 2, the corrugated box 1 of the inner surface shape which is easy to fit the external shape of the interior bag 20 in which each corner part was rounded. Is obtained.

Note that the shape of the two double bent portions 7 and 8 extending in two rows is not particularly limited to that shown in the drawing as long as the lines to be bent are divided into two. For example, the double bent portions 7L and 8L may have a parallel portion, but may be formed so as to draw an arc without a parallel portion.
Moreover, the curve which comprises a double bending part is not necessarily a circular arc, may be comprised by curves other than a circular arc, and also does not necessarily need to be comprised by a curve, and several straight lines were connected. Form may be sufficient.

FIG. 5A shows a state in which the inner bag 20 filled with a high-temperature liquid shortly after the heat disinfection operation is packed in the cardboard box 1 and loaded in two stages for the purpose of storage or transportation.
The high-temperature liquid in the inner bag 20 is in an expanded state due to the vapor or other gas mixed therein, and the appearance of the liquid and the inner bag 20 is based on a cooling phenomenon (decrease in liquid temperature) that starts immediately after loading. The volume gradually shrinks.

  When the liquid temperature finally drops to near room temperature, the upper surface of the interior bag 20 is lowered together with the liquid surface as shown in FIG. 5B, so that the ceiling surface inside the cardboard box 1 and the interior bag A space S is formed between the upper surface 20 and the lower cardboard box 1 in particular receives the load of the cardboard boxes 1 stacked on the upper stage.

  However, the vicinity of the central portion of each side wall plate 2 is effectively reinforced by the pair of left and right vertical ridge lines VP or the rectangular bulging region W described above, and thus does not buckle. In addition, the upper and lower end portions of each side wall plate 2 are also configured by the curved inclined surface F and the inclined connecting portion J that have already been inclined inward at a uniform angle from the completion of the assembly of the cardboard box 1. The influence received from the load of the stacked cardboard boxes 1 is that the vicinity of the vertical center of the cylindrical body 10 is slightly enlarged in the radial direction, and the degree of inclination of the curved inclined surface F and the inclined connecting portion J from the vertical direction is increased. It only needs to increase somewhat evenly. As a result, even if the cardboard boxes 1 are stacked in three or more stages, there is little possibility that the cardboard boxes 1 will be tilted sideways and collapse.

[Another embodiment]
<1> The shape of the laterally bent portion Q is not limited to the above embodiment, and can be implemented according to various modifications shown in FIG. 6, for example.

  In the lateral bent portion Q illustrated in FIG. 6A, the left and right single-line bent portions 6L and 6R in the above embodiment are omitted, and the left and right double bent portions 7 and 8 are formed on the flap 3 (4). It arrange | positions so that it may have a starting point at both ends.

  In the example of FIG. 6B, the left and right double bent portions 7 and 8 in the above embodiment are connected to each other without the central single wire bent portion 6C.

  In the example of FIG. 6C, the left and right and center single-line bent portions 6L, 6C, 6R in the above embodiment are omitted, and the left and right double-folded portions 7, 8 are both ends of the flap 3 (4). Are connected to each other without the central single-line bent portion 6C.

  In the example of FIG. 6 (d), single double bent portions 7, 8 are formed between the left and right single wire bent portions 6L, 6R. In the example of FIG. 6 (e), left and right single wires are further formed therefrom. The bent portions 6L and 6R are omitted, and the left and right ends of the single double bent portions 7 and 8 are positioned at both ends of the flap 3 (4).

<2> You may implement in the form by which the horizontal bending part Q containing a double bending part was provided only in the horizontal bending part Q between an upper flap and a side wall board.

  The present invention is an invention that can be used as a technique for solving the problems conventionally found in cardboard boxes (bag-in-boxes) that contain interior bags containing various liquids.

1 Cardboard box 2 Side wall plate (2A, 2B, 2C, 2D)
3 Lower flap (3A, 3B, 3C, 3D)
3A outer flap 3B inner flap 3C outer flap 3D inner flap 4 upper flap (4A, 4B, 4C, 5D)
4A Outer flap 4B Inner flap 4C Outer flap 4D Inner flap 6 Single wire bent part (6C, 6L, 6R)
7 Double bent part (7L, 7R)
8 Double bent part (8L, 8R)
10 Tubular body F Curved inclined surface (double-folded part)
G Functional area (double bent part)
P Vertical folding part Q Horizontal folding part R Auxiliary lateral folding part (auxiliary folding part)
T Virtual border (border)
VP Vertical ridge line VH Horizontal ridge line W Rectangular bulge area

Claims (6)

A cylindrical main body connected to opposite side wall plates, and a flap connected from both ends of the side wall plate to close the opening of the cylindrical main body,
Two laterally extending portions provided between the cylindrical main body and the flap that closes at least the upper opening are extended in two rows at positions spaced vertically from the boundary between the cylindrical main body and the flap. A cardboard box with a heavy folded part.   The cardboard box according to claim 1, wherein the laterally bent portion includes two double bent portions arranged side by side along the boundary line.   The horizontal bending portion includes a pair of single-line bending portions extending in a line from left and right end portions of the flap, and the double-folding portion disposed between the pair of single-wire bending portions. The cardboard box described.   The double-folded portion facing the upper double-folded portion is also provided in a laterally-folded portion provided between the cylindrical main body and the flap that closes the lower opening. 4. The cardboard box according to any one of 3 above.   The cardboard box according to claim 4, wherein a pair of auxiliary bent portions that extend in the lateral direction and are spaced apart from the upper and lower double bent portions inward in the vertical direction are provided on the side wall plate.   The flap includes an inner flap disposed on the inner side of the box and an outer flap disposed on the outer side, and a laterally bent portion between the inner flap and the side wall plate is a laterally bent portion between the outer flap and the side wall plate. The cardboard box according to any one of claims 1 to 5, wherein the cardboard box is displaced inward in the vertical direction.

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