JP5783053B2 - Cardboard box with divider - Google Patents

Description

  The present invention comprises a rectangular parallelepiped cardboard box that is formed of a single blank sheet and at least the top surface is closed by a pair of inner flaps and a pair of outer flaps, and a partition plate that divides the cardboard box. It is related with the cardboard box with a partition plate which combines.

  The most common type A cardboard boxes classified as 0201 in JIS Z 1507 are closed at the top and bottom in order to make the raw material cardboard sheets required according to the size of the cardboard boxes the minimum necessary size. The length from the fold line between the side wall of the inner and outer flaps to the flap tip edge is formed to be substantially the same length, and the tip edges of the pair of outer flaps (long side wall side flaps) are in a butted state and the top surface And the bottom is closed, but the tip edge of the inner flap (short side wall flap) is in a separated state. In the case of this type of cardboard box, the point where the front edge of the inner flap is separated and the inner surface of the outer flap is exposed in the box is stronger than the other part where the inner and outer flaps overlap. It is a low part.

  In order to reinforce the concave part of the inner surface of the box where the inner surface of the outer flap is exposed as described above, it has been practiced for a long time to arrange a pad (filling plate). However, even if such a reinforcing structure is adopted, the reinforcing effect against the load applied from the outside to the inside of the box from the outside on the top surface and the bottom part consisting only of the outer flap is not sufficient. Absent.

  In the case of the above-described A-type cardboard box, a partition plate made of a cardboard sheet is also arranged in the box in order to categorize and store the contents in the box. The partition plate arranged for such a purpose has the top and bottom strength against the load applied from the outside of the top and bottom to the inside of the box by bringing the upper and lower edges into contact with the inner surface of the inner flap in the box. It plays a role of reinforcement.

  Patent Document 1 (Japanese Patent Application Laid-Open No. 2003-118724) includes an edge portion that contacts an inner surface of an inner flap in a box as a partition plate made of a corrugated cardboard sheet having a function of reinforcing the top surface and the bottom portion as described above. In addition, a cardboard box with a partition plate is also proposed in which a partition plate having a protruding edge portion that abuts against the inner surface of the outer flap in a recess in which the tips of the inner flaps are separated and the inner surface of the outer flap is exposed, A cardboard box in which this type of partition plate is arranged is excellent in strength against a load applied to the top and bottom from the outside.

  In the case of the cardboard box in which the partition plate of Patent Document 1 is arranged, when a single flat plate-like body is used as the partition plate, the inner surface of the inner and outer flaps with which the edge of the partition plate is in contact is a flat surface. Depending on the direction of the impact applied to the box, the edge of the partition plate slides on the inner surface of the flap and the partition plate itself may be inclined, thereby impairing the function as a support plate. In Patent Document 1, as a partition plate that can eliminate the disadvantages of the single flat plate-shaped partition plate as described above, two partition plates that are bent into a U-shape are combined back to back into an H shape, Arrange the center plate back-to-back in the box so that the top edge of the partition plate part is perpendicular to the butt end edge of the outer flap that closes the top surface. A partition plate is shown in which a partition plate formed in combination with a mold can be arranged and fixed so that each side edge is in contact with four corners in the box.

  In the case of a cardboard box in which a partition plate having a structure in which a plurality of cardboard plates are combined as described above is also provided, the effect of reinforcing the strength of the box body is sufficient, but a partition plate combining a plurality of partition plates is a material used This is disadvantageous in terms of cost. Moreover, since the top and bottom closing structures are bonded to the inner flap with the leading edges of the outer flaps butting each other, the top surface of the cardboard box cannot be easily opened.

JP 2003-118724 A

The present invention is integrated with a top structure of a general A-type corrugated cardboard box and a closed structure portion by inner and outer flaps on the bottom, so that the top and bottom of the box can be sufficiently withstand the load applied to the box from the outside. An object of the present invention is to provide a corrugated cardboard box having a partition plate having a single flat plate structure capable of reinforcing strength.
In addition, the present invention can reduce the amount of corrugated cardboard material used to form the box, and can easily perform the work of opening the top surface by causing the front edge of the outer flap that closes the top surface. It is an object of the present invention to provide a cardboard box having a partition plate that can form a top surface closing structure.

  In the cardboard box with a partition plate according to the present invention capable of solving the above-mentioned problems, the leading edges of the rectangular parallelepiped cardboard box (A type) are basically in a butted state as common to the following inventions. A gap is formed between the top edges of the pair of outer flaps that close the top surface so that a part of the upper end of the corrugated board placed in the box as a partition plate can be inserted and fitted. It has the structure which integrated the closing structure part and partition plate by a flap.

(1) A pair of short side wall plates (2), (4) are connected to the top surface (T) side via fold lines (L2a), (L4a), and the respective fold lines (L2a), ( A pair of inner flaps (2a), (4a) having a length (L2a-2c), (L4a-4c) from L4a) to the leading edge (2c), (4c) being substantially the same length, and a pair of lengths The side wall plates (1) and (3) are connected to the top surface (T) side via fold lines (L1a) and (L3a), and the leading edge (1c) from each fold line (L1a) and (L3a). , (3c), the lengths (L1a-1c), (L3a-3c) are formed by a pair of outer flaps (1a), (3a) having substantially the same length as the pair of inner flaps. In the rectangular parallelepiped corrugated cardboard box body (A1) having the surface closing structure, the inner surface and the bottom of the top surface closing structure ( ) A cardboard box body the upper and lower leading edge to the inner surface in contact with the (single plate-like partition plate (A2) is a partition fitted with a cardboard box which is arranged for 2 minutes in A1) (A),
The tip of the single flat partition plate (A2) is inserted between the opposing tip edges (1c) and (3c) of the pair of outer flaps (1a) and (3a) in the top surface closing structure. The single flat partition plate (A2) is separated by a distance that forms a gap (S) to be fitted, and the projecting central portion (8) and its left and right sides at the tip edge on the top surface closing structure portion side It has side portions (9) and (9), and the front end surface of the projecting central portion (8) of the single flat partition plate (A2) is the pair of outer flaps (1a) and (3a). Are inserted into and fitted into the gap (S) of the top surface closing structure portion at substantially the same height as the top surface of the top surface, and the left and right side portions (9), (9) of the projecting central portion (8) are the top surface closing structure. The top surface closing structure portion is supported from the inner surface side of the cardboard box body (A1) by contacting the inner surface (the surfaces of the inner flaps 2a and 4a) The butterfly, partition fitted with a cardboard box (A).

(2) Each pair of corrugated cardboard box bodies (A1) is connected to the top (T) side and the bottom (B) side of the pair of short side wall plates (2), (4) via a broken line. The inner flaps (2a) and (4a) and (2b) and (4b) are connected to the top (T) side and the bottom (B) side of the pair of long side wall plates (1) and (3) via folding lines. Each pair of provided outer flaps (1a), (3a) and (1b), (3b) is a fold line between the long side wall plate and the short side wall plate (L1a, L1b, L2a, L2b, L3a, L3b, L4a, L4b) to the respective leading edges (1c, 1d, 2c, 2d, 3c, 3d, 4c, 4d) (L1a-1c, L1b-1d, L2a-2c) , L2b-2d, L3a-3c, L3b-3d, L4a-4c, L4b-4d) are substantially equal in length. A pair of inner flaps (2a) and (4a) on the top surface (T) side, a pair of inner flaps (2b) and (4b) on the bottom (B) side, and a pair of outer flaps (1a) on the top surface side (3a) and a rectangular parallelepiped corrugated cardboard box body (A1) formed by joining the outer flaps (1b) and (3b) on the bottom side in a folded state to form a top surface closing structure portion and a bottom portion closing structure portion The cardboard box with a partition plate according to item (1), wherein

(3) A structure in which the bottom end side edge of the partition plate (A2) contacts and supports from the inside supports the top surface closing structure portion from the inside by the tip edge of the partition plate (A2). The cardboard box with a partition plate according to the item (1) or (2), characterized in that it is a bottom-closing structure portion having the same structure as the above.

(4) The front end edges of both outer flaps (1a) and (3a) in contact with the projecting central portion (8) of the partition plate (A2) fitted in the gap (S) of the top surface closing structure portion ( 1c) and (3c), parallel to the inner direction of both outer flaps, starting from two points (m1) and (m2), (m3) and (m4) at the respective leading edges (1c) and (3c). A pair of score lines (x1) and (x2), (x3) and (x4), and a pair of score lines (x1) and (x2), end points in both flaps (x3) and (x4) ( (3c) between the outer flaps (1a) and the leading edge (1c) of (3a) by fold lines (L6) and (L6) connecting m5) and (m6) and between (m7) and (m8), respectively. Open side flaps (6), (6) are formed by pushing down the side) into the cardboard box body (A1). Characterized Rukoto (1) to (3) partition fitted with a cardboard box according to any one of clauses.

The corrugated cardboard box (A) with a partition plate according to the present invention has a leading edge where the leading edge protruding central portion (8) of the partition plate (A2) is separated from both outer flaps (1a) and (3a) in the top surface closing structure portion. It fits into the gap (S) formed between (1c) and (3c), and the tip end surface of the tip edge protruding central portion (8) is the outer flap (1a) and the upper surface of (3a). Since the height is substantially the same, the pressure applied to the entire top surface (T) when the cardboard boxes are stacked is first a flat partition plate that is arranged in a vertical state and is difficult to compress and deform vertically. It is received by the belt-like tip surface of the tip edge protruding central portion (8) of (A2), and the pressure applied to the other flat top surface portion is reduced. Also, the left and right tip edge side portions (9) and (9) belt-like tip surfaces of the tip edge protruding central portion (8) are formed on the inner surfaces of the inner flaps (2a) and (4a) of the top surface closing structure portion. Since the top surface closing structure is supported in contact with the top surface in the vertical direction, deformation of the entire box body (A1) due to the pressure applied to the top surface is further reliably prevented.
In addition, since the inner flap is supported and fixed by the partition plate and the tip of the inner flap is not pushed downward, it accommodates articles (for example, gable-top type paper container drinks) in which a gap is generated at the top of the cardboard box In this case, there is no possibility of damaging the container with the leading edge of the inner flap.

The flat partition plate (A2) has a center portion (8) protruding from the top edge on the top surface (T) side and an outer flap (1a) on the top surface side and a leading edge (1c) (3a) facing each other ( 3c), the support function performed by the partition plate (A2) is not impaired by the impact applied to the cardboard box body (A1). Can be securely held in the stored state.
Further, the outer flaps (1a) and (3a) in contact with both sides of the leading edge protruding central portion (8) of the partition plate (A2) fitted in the gap (S) of the top surface closing structure portion. Since there is no inner flap directly under the front edge region, the top surface opening operation is facilitated by simply pressing the front edge (1c) and (3c) of the opening forming flap (6) into the box. An opening can be formed.

  In addition, a gap (S) is formed between the pair of outer flaps (1a) and (3a) at both end edges (1c) and (3c) in the top surface closing structure portion of the rectangular parallelepiped cardboard box body (A1). Therefore, it is necessary to shorten the length from the folding lines (L1a) and (L3a) on the long side wall plate side of both flaps to the leading edges (1c) and (3c) of both flaps. The length of the inner flap portion of the short side wall can also be shortened. As described above, since the vertical length (paper width) of the blank sheet forming the cardboard box body (A1) can be further narrowed, depending on the size of the cardboard box body (A1), when obtaining a blank sheet The cost can be reduced by making the width of the corrugated cardboard used in the paper smaller than the conventional one.

It is a blank sheet figure which forms the cardboard box main body A1 of the cardboard box A with a partition plate of this invention. It is a figure which shows two examples of partition plates A2 which can be used for the cardboard box A with a partition plate of this invention. It is a completion perspective view of the cardboard box A with a partition plate of this invention. It is a vertical direction sectional view showing the support state of the top surface closing structure portion by the leading edge protruding central portion of the partition plate A2 and the left and right leading edge side portions. It is a top view of the top | upper surface closing structure part of the cardboard box A with a partition plate of this invention. It is the elements on larger scale of the opening formation flap part of a top surface closing structure part. It is a figure which shows the opening operation | work of the top | upper surface closing structure part of the cardboard box A with a partition plate.

Hereinafter, with reference to drawings, the cardboard box A with a partition plate of this invention is demonstrated more concretely.
The rectangular parallelepiped cardboard box body (A1) of the cardboard box with partition plate (A) of the present invention is on the top surface (T) side as shown in the blank sheet of FIG. 1 as one embodiment of the present invention. An outer flap (1a) for closing the top surface is continuously provided via a fold line (L1a), and an outer flap (1b) for closing the bottom portion is continuously provided via a fold line (L1b) on the bottom (B) side. The long side wall plate (1) having a margin (5) continuously provided on one side edge via a folding line (L4), and an inner flap for closing the top surface via a folding line (L2a) on the top side (2a) is provided in a row, and a short side wall plate (2) in which a bottom closing inner flap (2b) is provided in a row on the bottom (B) side via a fold line (L2b), and a fold line (L3a) on the top side. An outer flap (3a) for closing the top surface is continuously provided via the bottom, and an outer flap for closing the bottom is provided via a fold line (L3b) on the bottom side. (3b) is connected to the long side wall plate (3), and the top surface closing inner flap (4a) is connected to the top surface via the fold line (L4a), and the fold line (L4b) is connected to the bottom side. From the corrugated blank sheet in which the short side wall plate (4) to which the inner flap (4b) for closing the bottom is connected via the fold lines (L1), (L2) and (L3) is sequentially provided Assembled.

  First, the long side wall plate (1), the short side wall plate (2), the long side wall plate (3), and the short side wall plate (4) are sequentially perpendicular to one direction by the folding lines (L1), (L2), and (L3). Bending and joining the glue margin (5) connected to the long side wall plate (1) via the folding line (L4) to the side edge of the short side wall plate (4) to form a rectangular parallelepiped cylindrical body. .

  Next, the inner flaps (2b) and (4b) connected to the bottom side of the short side wall plate (2) and the short side wall plate (4) via the fold line (L2b) and the fold line (L4b) are bent and long A pair of outer flaps (1b) and (3b) connected to the bottom side of the side wall plate (1) and the long side wall plate (3) via a fold line (L1b) and a fold line (L4b) are connected to both inner flaps (2b). ), (4b), the cardboard box main body (A1) in the open state with the top surface side closed with the bottom (B) closed.

In the cardboard box body (A1) with the bottom closed as described above, a partition plate (A2) of the type shown in FIGS. 2 (a) and 2 (b) is provided with a pair of long side wall plates (1), Set parallel to (3) and store the items on both sides of the partition plate (A2). In this state, the inner flaps (2a) and (4a) for closing the top surface, which are connected to the short side wall plate (2) and the short side wall plate (4) via the fold line (L2a) and the fold line (L4a), are partitioned. The plate (A2) is bent on the left and right end edge side portions (9), (9), and further connected to the long side wall plate (1) and the long side wall plate (3) via the folding lines (L1a) and (L3a). The outer flaps (1a) and (3a) for closing the top surface are folded to the top surface side so as to cover both inner flap surfaces, and the leading edge (1c) and the outer flap (3a) of the outer flap (1a) The inner flap surface and the outer flap surface are joined in a state where the leading edge protruding central portion (8) of the partition plate (A2) is fitted in the gap (S) formed between the leading edges (3c) of the partition plate (A2). 4 and the cardboard box A with a partition plate shown in the perspective view of FIG. 3 having the top surface closing structure portion shown in FIG. 5 is completed.
Note that the short side wall plate (4) and the short side wall plate (2) facing the short side wall plate (4) of FIG. 3 can be provided with a gripping portion (7) as in a normal cardboard box.

  As shown in FIGS. 1, 3, 5 to 7, the pair of outer flaps (1 a) and (3 a) forming the top surface side closing structure portion of the cardboard box body (A) When pulling out the outer flap joined to the inner flap surface in order to open the top surface closing structure portion in the central region including the tip edges (1c) and (3c), the tip edge of the outer flap is pulled up It is preferable to form an opening forming flap (6) that can easily form a finger-hanging opening that can be easily performed.

  As shown in FIG. 6, the opening forming flap (6) has the front flaps (1c) and (3c) of the outer flaps (1a) and (3a) as the front edge protruding central portion (8) of the partition plate (A2). Starting from two points (m1) and (m2), two points (m3) and (m4) in the part holding the two, the cut lines (x1), (x2) and (x3) parallel to the inner direction of both outer flaps ) And (x4), and between the end points (m5) and (m6) and the end points (m7) and (m8) in the outer flaps of the cut lines (x1) and (x2), (x3) and (x4) Are formed by providing a fold line (L6) and a fold line (L6) in both outer flaps.

  As shown in FIG. 7A, the opening operation of the top surface side closing structure portion using both opening forming flaps (6) and (6) is performed first with the opening forming flap (1a) of one outer flap (1a). 6) The tip edge (1c) side of the box is pushed down into the box body (A1) with a finger and bent at the fold line (L6), and as shown in (b), an opening-forming flap ( 6) With the finger folded until it comes into contact, the front edge (1c) side of the outer flap (1a) is pulled up by the finger hung on the inner surface side of the outer flap (1a), and the inner flaps (2a), (4a) This is done by peeling off the top surface. The peeling operation of the outer flap (1b) using the opening forming flap (6) of the other outer flap (1b) is performed in the same manner.

  The locations of the outer flaps (1a) and (3a) sandwiching the leading edge protruding central portion (8) of the partition plate (A2) on which the opening forming flap (6) is formed are the cardboard box body directly below Since the partition plate (A2) does not exist in (A1), the opening forming flap (6) is pushed down even when the opening forming flap (6) formed at this location is pressed down to form the opening. Can be reliably formed without being disturbed.

  As described above, in the cardboard box with partition plate (A) of the present invention, the partition plate (A2) installed in the cardboard box body (A1) is formed of a cardboard box body ( The shape of the tip edge on the top surface closing structure portion side of A1) must have a tip edge protruding central portion (8) and left and right tip edge side portions (9), (9). As described above, the leading edge of the pair of outer flaps (1a) and (3a) that forms the top surface closing structure portion is the center portion (8) of the leading edge of the partition plate (A2) on the top surface closing structure portion side. By setting it in an arrangement state in which it is fitted in the gap (S), a cardboard box with a partition plate that can sufficiently withstand an impact assumed when handling a normal cardboard box can be obtained. Therefore, as shown in FIG. 2B, the front end edge on the bottom closing structure portion side can be a partition plate having a shape without unevenness.

  However, as shown in FIG. 2 (a), the structure of the top surface side leading edge and the bottom surface side leading edge of the partition plate A2 is substantially symmetrical, and the bottom surface side closing structure portion is also the top surface side closing structure portion. If the gap (S) is formed between the leading edges (1d) and (3d) of the outer flaps (1b) and (3b) as in FIG. 3, the cardboard box with a partition plate (A ) Deformation prevention function can be made more reliable. Moreover, the cost reduction effect by reducing the width | variety of the corrugated cardboard to be used can be expected more.

The state in which the partition plate (A2) shown in FIG. 2 supports the top surface side closing structure portion from the inside of the cardboard box body (A1) by the top surface side leading edge will be further described with reference to FIG.
The partition plate (A2) is in contact with the lower surface (inner surface) of the inner flaps (2a) and (4a) constituting the top surface side closing structure portion of the cardboard box main body (A1) so that the top surface side closing structure portion can be The left and right tip edge regions (9), (9), the outer flap (3a) constituting the top surface side closing structure, and the front side of the partition plate (A2) are illustrated. The leading edge held between the leading edges of the outer flaps (1a) and (3a) in a state of being fitted in the gap (S) formed between the leading edges of the outer flap (1a) It has a protruding central portion (8).

  The leading edge protruding central portion (8) is located on the same plane as the top surface of the top surface side closing structure portion, so that the pressure applied to the entire top surface is the center of the outer flap (flute). Even if a pressure that crushes the surface is applied, the strength against the pressure in the vertical direction is excellent, so that there is no deformation and the function of reducing the pressure on the surrounding outer flap surface is provided.

  Also, in the case of the left and right tip edge regions (9), (9) that support the top surface side closing structure portion from the inner flap surface (inner surface) side in the cardboard box body, the strength against the pressure in the vertical direction is excellent. Since the inner flap is supported in the arrangement state, it is not crushed by the impact force expected to be applied to the cardboard box body during normal handling of the cardboard box, and the impact applied to the cardboard box body from the vertical direction It has a function to give the cardboard box body sufficient strength to withstand the force.

  FIG. 4 shows a state in which the partition plate (A2) in a state where both side portions of the front edge of the partition plate (A2) are notched is arranged, and FIG. 2 also has the same shape. Although the partition plate (A2) is shown, it is not an indispensable shape / structure in the partition plate (A2) to make such a side edge portion a notch, and the entire leading edge is divided into the partition plate (A2). The shape and structure can be arbitrarily adopted, including the same width as the width of.

  A pair of outer flaps (1b) and (3b) in the bottom closed structure portion of the cardboard box with a partition plate (A) is separated from both end edges (1d) and (3d) to form a gap (S). As shown in FIG. 2A, the bottom edge side protruding center portion (10) on the bottom side of the partition plate (A2) is fitted into the gap (S) as in the case of the top surface closing structure portion. The partition plate (A2) can be arranged with the left and right tip edge side portions (11), (11) in contact with the inner surfaces of the inner flaps (2b), (4b) of the bottom closing structure portion. By forming such a bottom closing structure portion, it is possible to provide a cardboard box with a partition plate that is used with the top and bottom reversed depending on the situation. In this case, it is preferable to form the opening forming slap 6 as described above also in the bottom closing structure portion.

  Next, a gap (between a pair of outer flaps (1a) and (3a) at both end edges (1c) and (3c) in the closed structure portion of the top surface (T) of the rectangular parallelepiped cardboard box body (A1) ( S) and a gap (S) between the pair of outer flaps (1b) and (3b) at both end edges (1d) and (3d) in the closed structure portion of the bottom (B). The advantages will be described.

  A gap formed between a pair of outer flaps (1a) and both end edges (1c) and (3c) of the top structure (T) of the rectangular parallelepiped cardboard box body (A1) (3a) ( The distance of S) is set to 10 mm, for example, and a gap (between the pair of outer flaps (1b) and (3b) at both front end edges (1d) and (3d) in the closed structure portion of the bottom (B) ( Taking the case where the interval of S) can also be 10 mm as an example, when purchasing a cardboard base paper with a plan to take two blank sheets, the paper width dimension of the raw corrugated sheet forming the blank sheet Can be made 20 mm narrower than the conventional one. Such reduction in the paper width dimension may lead to a reduction in the base paper width of the used corrugated cardboard by one rank, which may lead to a significant cost reduction for the raw corrugated cardboard.

  As described above, the structure of the cardboard box with partition plate (A) of the present invention is such that the front edge protruding central portion (8) of the partition plate (A2) on the top surface (T) side is connected to the top of the cardboard box book (A1). A simple structure that fits into the gap (S) formed between the front edges of both outer flaps in the face-closed structure, giving it enough strength to withstand the pressure applied to the entire top surface when the cardboard boxes are stacked. In addition, since the raw material corrugated cardboard can greatly reduce the cost, it can be suitably applied as a reinforcing structure for corrugated cardboard of various sizes.

  Further, the top surface closing structure portion of the cardboard box with partition plate (A) of the present invention has a pair of outer flaps that close the top surface apart from each other to form a gap, and the box in the gap The center region of the leading edge of the partition plate arranged in the box is fitted in the place where the inside and the outside communicate with each other, and both the portions in the portion where the leading edge protruding central part of the partition plate is fitted. Since it is possible to provide an opening forming flap that can be pushed down and opened at the front edge portion of the outer flap, which can simplify the work at the time of opening the top surface, the inner and outer flaps forming the top surface closing structure portion can be joined. It can be applied as a top surface closing structure portion of various cardboard boxes that require an opening operation by peeling off the portion.

1: Long side wall plate 2: Short side wall plate 3: Long side wall plate 4: Short side wall plate 5: Adhesive margin 6: Opening flap 7: Holding portion 8: Top surface side leading edge protruding central portion 9: Top surface side leading edge side Side 10: bottom edge protruding central portion 11: bottom edge side edge 1a, 3a: top outer flap 2a, 4a: top inner flap 1b, 3b: bottom outer flap 2b, 4b : Bottom side inner flaps 1c to 4c, 1d to 4d: flap leading edges L1 to L4 and L6: fold lines L1a to L4a, L1b to L4b: fold line A: cardboard box body with partition plate A1: cardboard box body A2: partition plate T: top Surface B: Bottom S: Gap x1 to x4: Cut line m1 to m4: Cut line start point m5 to m8: Cut line end point

Claims (4)

A pair of inner flaps that are connected to each top side of the pair of short side wall plates via a fold line, and the length from each fold line to the leading edge is substantially the same, and a pair of long side wall plates The top surface is formed by a pair of outer flaps that are connected to the top surface side of each of the two through a fold line, and the length from each fold line to the tip edge is substantially the same length as the pair of inner flaps. A single flat partition that divides the inside of the cardboard box body into two parts by placing the top and bottom tip edges in contact with the inner surface of the top surface closing structure part and the inner surface of the bottom part is arranged in the rectangular parallelepiped cardboard box body having the closed structure part. A cardboard box with a partition plate,
The opposing top edges of the pair of outer flaps in the top surface closing structure part are separated by a distance that forms a gap for inserting and fitting the front end part of the single flat plate-like partition plate. The flat plate-like partition plate has a protruding central portion and its left and right side portions at the leading edge on the top surface closing structure portion side, and the leading edge surface of the protruding central portion of the single flat plate-like partition plate is the aforementioned A pair of outer flaps are inserted into and fitted into the gap of the top surface closing structure portion at substantially the same height as the upper surfaces of the pair of outer flaps, and the left and right side portions of the projecting central portion abut against the inner surface of the top surface closing structure portion. A cardboard box with a partition plate, wherein the surface closing structure is supported from the inner surface side of the cardboard box body.   The cardboard box body has a pair of inner flaps connected to each other via a fold line on the top and bottom sides of the pair of short side wall plates, and a fold line on the top and bottom sides of the pair of long side wall plates. Each of the pair of outer flaps that are connected via the length of the fold line between the long side wall plate and the short side wall plate that are connected to each other is substantially equal to the length of each tip edge, A pair of top flaps on the top side and a pair of bottom flaps on the top side are joined in a state in which the pair of top flaps on the top side and outer flaps on the bottom side are folded together, and the top closure structure and bottom closure structure The cardboard box with a partition plate according to claim 1, wherein the cardboard box body is a rectangular parallelepiped cardboard box formed with a portion.   The bottom portion of the partition plate, which is in contact with the bottom end edge of the partition plate, supports the inside from the inner side, and the bottom structure of the same structure as the structure in which the top surface closing structure portion is supported by the front end edge of the partition plate. The cardboard box with a partition plate according to claim 1, wherein the cardboard box is provided.   Both outer flap inward directions starting from two points at each of the leading edges, in the region of the leading edges of both outer flaps in contact with the protruding central part of the partition plate fitted in the gap of the top surface closing structure portion An opening forming flap that opens by pushing down the tip edge side of both outer flaps into the cardboard box body by a pair of cut lines extending in parallel to each other and a fold line connecting the end points in both flaps of each pair of cut lines. It forms, The cardboard box with a partition plate of any one of Claims 1-3 characterized by the above-mentioned.

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