Laminated packaging box and packaging box sheet

Abstract

To provide a laminated packaging box and a sheet for the packaging box capable of easily carrying the laminated packaging box.SOLUTION: The laminated packaging box 1a is formed by using a plurality of sheet 2A and 2B to form the same number of packaging part 2A and 2B as the sheet 1a and 1a. The sheet 2A and the 2B have a bottom face plate 3, a pair of first erected face plates 4, 4, a pair of second erected face plates 5, 5, and top face plates 6, 6 connected to the second erected face plates 5, 5. In the vertically adjacent sheets 2A and 2B, in a state that the mutual bottom surface plates 3 and 3 are shifted by about 90 °, a surface plate-shaped locking part composed of the second plate part 2A and 6b in the lower stage sheet 6b is locked to a locking object part on the upper end side of the first erected surface plates 4 and 4 and the third erected surface plate 9 in the upper stage sheet 2B.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a laminated packaging box and a sheet for a packaging box, which are formed using a plurality of sheets to form packaging sections in the same number as the sheets. [Background technology]

[0002] BACKGROUND ART Conventionally, there are laminated packaging boxes capable of packaging items such as dishes and foods, such as pizza and cake, which are formed by folding a single paper sheet, for example.

[0003] One example of this type of stackable packaging box is one that is box-shaped and made up of a bottom panel, four vertical panels connected to the bottom panel on all four sides, and a top panel connected to the rear vertical panel of the four, with locking pieces extending upward protruding from each corner of a pair of adjacent vertical panels at two opposing corners, so that when multiple packaging boxes are stacked one on top of the other, the two corners of the upper packaging box fit inside the locking pieces protruding upward from the two corners of the lower packaging box and are locked, thereby preventing lateral displacement when stacked (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2015-101408 A (page 5, figures 1 to 4) Summary of the Invention [Problem to be solved by the invention]

[0005] In the stackable packaging box described in Patent Document 1, when multiple packaging boxes are stacked, the corners of the upper packaging box are locked onto the inside of the locking pieces of the lower packaging box, preventing the upper and lower packaging boxes from shifting sideways. However, in order to carry multiple stacked packaging boxes together, it is necessary to lift and hold the entire box from the bottom, which creates the problem that they are not easy to carry.

[0006] The present invention has been made in light of these problems, and aims to provide a stacked packaging box and a sheet for packaging boxes that allow stacked packaging boxes to be easily carried. [Means for solving the problem]

[0007] In order to solve the above problems, the laminated packaging box of the present invention comprises: A laminated packaging box formed by using a plurality of sheets to form packaging sections of the same number as the sheets, The sheet has a bottom plate, a pair of first upright plates, a pair of second upright plates, and a top plate connected to the second upright plates, The vertically adjacent sheets are characterized in that the top panel of the lower sheet is engaged with the top panel of the upper sheet, with the bottom panels of the two sheets shifted by approximately 90 degrees. According to this feature, the multiple sheets are stacked so that the bottom panels are offset by approximately 90 degrees, and the top panel of the lower sheet is engaged with the upper sheet, connecting the upper and lower sheets in the stack. This makes it easy to carry multiple stacked packaging boxes.

[0008] The top panel of the upper sheet is overlapped from above on the top panel of the lower sheet. According to this feature, the top panel of the lower seat is engaged with the top panel of the upper seat over a wide area, resulting in a strong connection.

[0009] The bottom plate of the upper sheet is disposed on the pair of first vertical plates folded into the vertical shape of the lower sheet. According to this feature, the upper seat is stably positioned relative to the lower seat, resulting in a strong connection.

[0010] The top panel of the lower seat is provided with a latched portion that latches onto a latching portion provided on the upper seat. According to this feature, the locked portion of the top panel of the lower seat is locked to the locking portion of the upper seat, so the connection state is strong.

[0011] A portion of the top panel that is connected to the second elevation panel at the lower level is a shared area with the second elevation panel, and the shared area is the same length as the first elevation panel. According to this feature, the second elevation panel of the lower level and the common part are the same height as the lower packaging box and the upper packaging box, so that when the packaging boxes are stacked and assembled, the height of all the elevations is roughly the same. This results in excellent stability when the packaging boxes are stacked.

[0012] A packaging box sheet having a bottom plate, a pair of first upright plates, a pair of second upright plates, and a top plate connected to the second upright plates, A portion of the top panel that is connected to the second elevation panel is a common portion with the second elevation panel, and the common portion is the same length as the first elevation panel. This feature allows both single-layer packaging boxes and laminated packaging boxes to be assembled using the same sheet.

[0013] The seat has a locking portion, The first vertical panel and the top panel are characterized in that they are provided with locked portions to which the locking portions are locked. According to this feature, the locking portion can be locked to the locked portion of both a single-layer packaging box and a multi-layer packaging box, thereby eliminating the need for an increased number of components.

[0014] Each of the top panels has a handle portion that is connected to the top panel and serves as a handle when stacked. The handle portion is characterized by comprising a cutout piece that is separated from the top panel by a cutout in half the width direction of the top panel, and a connecting piece that is connected to the remaining half of the width direction. According to this feature, by overlapping one cutout piece with the other connecting piece from the opposite side, the handle will not open. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a development view showing a packaging box sheet according to an embodiment of the present invention; [Figure 2] FIG. 2 is a perspective view showing the state before two box-shaped sheets are stacked one above the other. [Figure 3] FIG. 1(a) is a perspective view showing two box-shaped sheets stacked one on top of the other, and FIG. 1(b) is a perspective view showing the top panel of the lower sheet being folded. [Figure 4] (a) is an oblique view showing the state in which the top panel of the lower seat is folded and placed above the bottom panel of the upper seat, and (b) is an oblique view showing the state in which the top panel of the upper seat is folded and placed above the top panel of the lower seat. [Figure 5] 10(a) and 10(b) are schematic plan views for explaining a method of arranging the left and right handle plates in reverse order. [Figure 6] FIG. 10 is a schematic plan view showing a state in which the left and right handle plates are arranged in reverse. [Figure 7] FIG. 1 is a perspective view showing a stacked packaging box formed by connecting two packaging boxes, one above the other. [Figure 8] 10(a) and 10(b) are perspective views showing a method of assembling a single-layer packaging box. [Figure 9] 10 is a perspective view showing a state in which an upper box-shaped sheet is stacked above the stacked lower and middle box-shaped sheets. FIG. [Figure 10] FIG. 1 is a perspective view showing a stacked packaging box formed by connecting three layers of packaging boxes. DETAILED DESCRIPTION OF THE INVENTION

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A laminated packaging box and a packaging box sheet according to the present invention will be described below with reference to examples. [Example]

[0017] A laminated packaging box and a packaging box sheet as an embodiment of the present invention will be described with reference to Figures 1 to 10. In the following description, the lower side of Figure 1 will be referred to as the front of the packaging box sheet, the upper side of Figure 1 as the rear of the packaging box sheet, the left side of Figure 1 as the left side of the packaging box sheet, and the right side of Figure 1 as the right side of the packaging box sheet. In addition, in Figures 1 to 10, for ease of explanation, the inner side in the packaging form is shown in light gray, and the outer side in the packaging form is shown in dark gray.

[0018] [Packing box sheet] As shown in FIG. 1, a packaging box sheet 2 (hereinafter simply referred to as sheet 2) according to an embodiment of the present invention is made of, for example, a single sheet having a predetermined thickness. By folding the sheet along pre-defined fold lines (dotted lines in the figure) to define each surface, a packaging box capable of packaging a food product (in this embodiment, pizza), which is an example of a packaged item, can be formed. While sheet 2 is made of corrugated cardboard in this embodiment, it may be made of any material, such as cardboard, a paper sheet that is resin-laminated on its surface to provide water and oil resistance, or a synthetic resin sheet. Although not specifically shown, each fold line has a concave groove or the like formed on the surface corresponding to the folding direction, allowing the sheet to be easily folded by hand.

[0019] Furthermore, by stacking multiple sheets 2 in a box shape in the vertical direction, a stacked packaging box 1A (see FIG. 7) is formed that has therein the same number of packaging sections 1a (see FIG. 2) as the multiple stacked sheets 2. As shown in FIG. 7, the stacked packaging box 1A can be changed between a packaging form in which pizza (not shown), an example of food, is packaged in each packaging section 1a, and an opening form as shown in FIG. 2, where the top opens to allow the pizza packaged in the packaging section 1a to be taken out.

[0020] In this embodiment, a form capable of packaging pizza, which is a food item, is illustrated as an example of the packaged item, but the present invention is not limited to this, and the packaged item may be food other than pizza, such as sweets such as cakes and tarts, or a dish. It may also be a meal kit that includes ingredients and a recipe. Furthermore, it may also be an item other than food or a dish.

[0021] As shown in Fig. 1, when the sheet 2 is unfolded with the inner surface facing upward, each surface is formed by making valley folds or mountain folds along fold lines indicated by dashed lines. In more detail, the sheet 2 mainly comprises a bottom panel 3 having a generally vertically elongated rectangular shape in plan view, a pair of left and right first elevation panels 4,4 having a generally vertically elongated rectangular shape in plan view and connected to the left and right sides of the bottom panel 3, a pair of front and rear second elevation panels 5,5 having a generally horizontally elongated rectangular shape in plan view and connected to the front and rear sides of the bottom panel 3, and a pair of front and rear top panels 6,6 (areas indicated by diagonal lines and crosshatched lines in Fig. 1) having a generally horizontally elongated rectangular shape in plan view and connected to the front and rear of the second elevation panels 5,5.

[0022] The seat 2 also has first engaging plates 7,7 which are connected to the left and right sides of the first vertical panels 4,4 and have an approximately triangular shape in plan view, handle plates 8,8 which serve as handle portions connected to the front and back sides of the top panels 6,6, third vertical panels 9,9 which are connected to the front and back sides of the first vertical panel 4 and have an approximately vertically elongated rectangular shape in plan view, fourth vertical panels 10,10 which are connected to the left and right sides of the second vertical panel 5, and a folding plate 11 which is approximately triangular in plan view and adjacent to the bottom panel 3, the third vertical panel 9 and the fourth vertical panel 10.

[0023] First slit holes 7a, 7a are formed in the first locked plate 7 as locked portions facing in the left-right direction. Hook-shaped locking portions 8a, 8a are formed on the left and right ends of the handle plate 8, and the handle plate 8 is locked by inserting the locking portions 8a, 8a into the first slit holes 7a, 7a of the first locked plates 7, 7. In addition, a hole 8b is formed in the center of the handle plate 8 in the left-right direction so that a finger can be inserted.

[0024] Second slit holes 18a, 18a serving as latched portions facing the front-to-rear direction are formed in the approximate center of the top panels 6, 6, and are latched by inserting latching portions 8a, 8a of handle plates 8 of sheets 2 constituting the upper packaging box into second slit holes 18a, 18a of sheets 2 constituting the lower packaging box. Also, second slit holes 18a, 18a are surrounded by fold line f2 facing the left-to-right direction and a "L"-shaped perforation m1, and second latched plates 18, 18 are formed in parts of the top panels 6, 6 by making an incision along perforation m1 and folding the top panels 6, 6 along fold line f2.

[0025] The height dimension L1 of the second vertical panel 5,5 and the height dimension L4 of the first vertical panel 4,4 are approximately the same (L1 = L4). Furthermore, the height dimension L2 from the fold line f1 between the second vertical panel 5 and the top panel 6 to the fold line f2 parallel to the fold line f1 is approximately the same as the height dimension L1 (L2 = L1). In other words, the height dimensions L1, L2, and L4 are approximately the same (L1 = L2 = L4). Furthermore, the front-to-back dimension L5 of the bottom panel 3 is slightly longer than the left-to-right dimension L6 (L5 > L6).

[0026] The top panel 6, 6 is composed of a first panel portion 6a, indicated by the crosshatched lines in FIG. 1, and a second panel portion 6b, indicated by the diagonal lines. As described below, when folded along fold line f1, the first panel portion 6a, which is part of the top panel 6, functions as the top panel 6. When folded along fold line f2, the first panel portion 6a functions as the second vertical panel 5. In other words, the first panel portion 6a can be considered a common portion that serves both as the top panel 6 and the second vertical panel 5. Therefore, when the first panel portion 6a functions as a vertical panel together with the second vertical panel 5, the sum of the heights L1 and L2 of the second vertical panel 5 and the first panel portion 6a is the sum of the heights L1 and L2, i.e., twice the length of the height L1 (L3 = L1 + L2, L3 = L1 × 2). The second panel portion 6b always functions as the top panel 6.

[0027] In this way, in this embodiment, the first plate portion 6a is configured as part of the top panel 6, and when configuring stacked packaging boxes 1A, 1C (see Figures 7 and 10), the lower and middle first plate portions 6a are used as the second vertical panels 5, and when configuring a single-layer packaging box 1B (see Figure 8(b)), the first plate portion 6a is used as the top panel 6, as will be exemplified below.

[0028] The handle plates 8,8 are composed of a cutout piece 8c that is separated from the top panel 6,6 by a linear cutout portion 15,15 in approximately half of the left and right width direction of the top panel 6,6, and a connecting piece 8d that is connected to the remaining half of the left and right width direction. In addition, a linear cutout portion 16 is formed between the third vertical panel 9,9 and the fourth vertical panel 10,10, and a linear cutout portion 17 is formed between the fourth vertical panel 10,10 and the top panel 6. The width of these cutout portions 15,16,17 is approximately equal to the plate thickness of the sheet 2.

[0029] [Construction method of two-tiered stacked packaging box] Next, a method for constructing a two-tiered, upper and lower stacked packaging box 1A using two sheets 2 will be described with reference to Figs. 2 to 7. For ease of explanation, the lower sheet 2 will be referred to as sheet 2A and the upper sheet 2 as sheet 2B. In addition, the description will be made with the lower right side of Fig. 2 as the front of the packaging box sheet, the upper left side of Fig. 2 as the rear of the packaging box sheet, the lower left side of Fig. 2 as the left side of the packaging box sheet, and the upper right side of Fig. 2 as the right side of the packaging box sheet.

[0030] First, as shown in FIG. 2, for the lower sheet 2A, the left and right first upright panels 4, 4 and the front and rear second upright panels 5, 5 are folded upward along the fold lines around the bottom panel 3 to form a packaging box with an open top. The third upright panel 9 and the fourth upright panel 10 are folded upward along with the first upright panels 4, 4 and the second upright panels 5, 5, while the third upright panel 9 is pushed inward and the folding panel 11 is pushed downward as shown by the black arrow in FIG. 2. To push the folding panel 11 downward, the user supports the bottom of the bottom panel 3 with the index and middle fingers of each hand, tilts the upwardly-raised left and right folding panels 11 inward, and pushes them downward with their thumbs, allowing the user to easily fold the bottom panel 2A by themselves without using a clip or other holder.

[0031] As a result, the folding plate 11 is folded inward by approximately 180 degrees, and the four third vertical plates 9 are arranged diagonally relative to the first vertical plate 4 and the second vertical plate 5. The bottom plate 3 and the peripheral wall consisting of the first vertical plate 4, the second vertical plate 5, and the third vertical plate 9 form a packaging section 1a having a generally octagonal shape in plan view. In addition, the first locked plates 7, 7 connected to the first vertical plates 4, 4 are bent inward. In this specification, approximately includes ±10 degrees.

[0032] Furthermore, by folding the second plate portion 6b and the handle plate 8 outward along the folding line f2 in the top plate 6, the first plate portion 6a can be used together with the second elevation plate 5 as an elevation plate.

[0033] Meanwhile, for the upper sheet 2B, the front and rear first elevation panels 4, 4 and the left and right second elevation panels 5, 5 are folded upward along the fold lines on the periphery of the bottom panel 3, forming a box-like shape with an open top. The third elevation panel 9 and the fourth elevation panel 10 are folded upward along with the first elevation panels 4, 4 and the second elevation panels 5, 5, while the third elevation panel 9 is pushed inward as shown by the black arrow in FIG. 2. As a result, the folding panel 11 is folded inward by approximately 180 degrees, and the four third elevation panels 9 are positioned diagonally relative to the first elevation panels 4 and second elevation panels 5. The bottom panel 3 and the peripheral walls formed by the first elevation panels 4, second elevation panels 5, and third elevation panels 9 form a packaging section 1a having a generally octagonal shape in plan view. Additionally, the first locked plates 7, 7 connected to the first erection plates 4, 4 are bent inward.

[0034] In addition, by folding the top panel 6, which consists of the first plate portion 6a and the second plate portion 6b, and the handle plate 8 outward along the fold line f1 between the top panel 6 and the second vertical panel 5, the first plate portion 6a can be used as the top panel 6.

[0035] Next, the upper sheet 2B is placed on top of the lower sheet 2A in such a position that the first vertical panels 4,4 face forward and backward and the second vertical panels 5,5 face left and right, so that the bottom panel 3 of the upper sheet 2B and the bottom panel 3 of the lower sheet 2A are offset by approximately 90 degrees from each other in a planar view around a rotation axis (not shown) facing up and down.

[0036] The bottom plates 3, 3 of the sheets 2A, 2B have a front-to-back dimension L5 slightly longer than a left-to-right dimension L6 in FIG. 1, so that when the upper sheet 2B is placed above the lower sheet 2A, as shown in FIG. 3(a), the lower surface of the bottom plate 3 of the upper sheet 2B rests on the upper edges of the left and right first erection plates 4, 4 and each third erection plate 9 of the lower sheet 2A. This allows the upper sheet 2B to be stably supported above the lower sheet 2A without using the upper edges of the front and rear second erection plates 5, 5 of the lower sheet 2A. In addition, the bottom plates 3, 3 of the upper and lower sheets 2A, 2B are held approximately parallel to each other.

[0037] Additionally, the combined height L3 of the second elevation panel 5 and the first panel portion 6a of the lower sheet 2A is twice the length of the height L1 of the first elevation panel 4. In other words, the second elevation panel 5 of the lower sheet 2A has a height L3 spanning the lower and upper sections, so when stacked and assembled, the height of the entire elevation of the first elevation panel 4 is roughly uniform. This provides excellent stability when stacked.

[0038] Furthermore, by rotating the upper seat 2B by approximately 90 degrees around a rotation axis facing up and down relative to the lower seat 2A and placing it thereon, the front and rear first upright panels 4, 4 of the upper seat 2B are arranged to face the inside of the front and rear first panel portions 6a, 6a of the lower seat 2A. As a result, the front and rear movement of the upper seat 2B is restricted by the front and rear first panel portions 6a, 6a of the lower seat 2A.

[0039] Next, as shown in Figure 3(b), the front and rear second plate portions 6b, 6b and the handle plates 8, 8 of the lower sheet 2A are folded upward by approximately 90 degrees along the fold line f2 to raise them up. Also, cuts are made along the perforations m1.

[0040] Next, as shown in Figure 4(a), the front and rear second plate portions 6b, 6b and the handle plates 8, 8 of the lower sheet 2A are folded inward by approximately 90 degrees and placed above the packaging portion 1a of the upper sheet 2B. As a result, the flat-plate-like locking portion consisting of the second plate portions 6b, 6b and the handle plates 8, 8, which are bent inward by approximately 90 degrees relative to the second erection plates 5, 5 consisting of the front and rear second erection plates 5, 5 and the first plate portions 6a, 6a of the lower sheet 2A, is placed on the upper edges of the front and rear first erection plates 4, 4 and the third erection plates 9, 9 of the upper sheet 2B and is locked to the locked portion consisting of these upper edges. In addition, the cutouts 8c, 8c of the left and right handle plates 8, 8 are folded upward along the fold line in the center of the front and rear of the handle plates 8, 8.

[0041] Next, as shown in Figure 4(b), the left and right top panels 6,6 and handle panels 8,8 of the upper sheet 2B are folded inward by approximately 180 degrees along the fold line f1 so as to overlap the second plate portions 6b,6b and handle panels 8,8 of the lower sheet 2A, and the handle panels 8,8 are folded upward by approximately 90 degrees relative to the top panels 6,6 to raise them up.

[0042] Here, when the left and right handle plates 8, 8 of the lower seat 2A approach each other, as shown in Figure 5(a), the cutout piece 8c of the left (lower in the figure) handle plate 8 is placed above the right (upper in the figure) top panel 6, and the cutout piece 8c of the right handle plate 8 is placed above the left top panel 6. Next, as shown in Figure 5(b), the central ends of the connecting pieces 8d, 8d of the left and right handle plates 8, 8 are butted together and arranged in a substantially straight line in the front-to-rear direction.

[0043] 6, the cutout piece 8c of the left handle plate 8 is bent toward the outer surface of the connecting piece 8d of the right handle plate 8, and the cutout piece 8c of the right handle plate 8 is bent toward the outer surface of the connecting piece 8d of the left handle plate 8. As a result, the left and right handle plates 8, 8 are arranged on opposite sides. In other words, the connecting portion between the connecting piece 8d and the top plate 6 of one handle plate 8 is inserted into the cutout portion 15 of the other handle plate 8, and the left and right top plates 6, 6 are locked together and integrated, thereby restricting the opening of the left and right top plates 6, 6.

[0044] 7, the front and rear locking portions 8a, 8a of the handle plates 8, 8 of the upper sheet 2B are inserted into and locked into the second slit holes 18a, 18a of the second locked plates 18, 18 of the lower sheet 2A, whereby the upper and lower sheets 2A, 2B are connected and integrated. This forms a stacked packaging box 1A having upper and lower packaging portions 1a, 1a.

[0045] Specifically, the upper and lower sheets 2A and 2B are connected to each other by the panel-shaped locking portion consisting of the second panel portions 6b and the handle panels 8 of the lower sheet 2A locking with the locked portions on the upper edges of the first vertical panels 4 and the third vertical panel 9 of the upper sheet 2B. Furthermore, by overlapping the top panels 6 of the upper sheet 2B from above with the top panels 6 of the lower sheet 2A, the top panels 6 of the lower sheet 2A are locked to the top panels 6 of the upper sheet 2B over a wide area, thereby providing a strong connection.

[0046] Furthermore, the second slit holes 18a, 18a serving as engaging portions formed in part of the top panel 6, 6 of the lower sheet 2A are engaged with the engaging portions 8a, 8a of the upper sheet 2A, thereby restricting the opening of the top panel 6, 6 of the upper sheet 2B and making the engaging state of the upper and lower sheets 2A, 2B more secure.

[0047] By connecting and integrating the upper and lower sheets 2A, 2B in this way, the upper and lower sheets 2A, 2B can be easily carried by grasping the handle plates 8, 8 of the upper sheet 2B without having to reach under the lower sheet 2A of the stacked packaging box 1A and lift it from the bottom.

[0048] [How to construct a single-layer packaging box] Next, we will explain how to create a single-tier, single-layer packaging box 1B using sheet 2. First, as shown in Figure 8(a), the front and rear first vertical panels 4,4 and the left and right second vertical panels 5,5 are folded upward along the fold line on the peripheral edge of the bottom panel 3 in a valley fold to form a packaging box with an open top. Then, as shown in Figure 8(b), the top panel 6,6 consisting of the first panel portion 6a and the second panel portion 6b and the handle panels 8,8 are folded inward along the fold line f1 between the top panel 6 and the second vertical panel 5, so that the first panel portion 6a is used as the top panel 6.

[0049] 5 and 6, the front and rear handle plates 8,8 are then placed upside down, and the locking portions 8a,8a of the handle plates 8,8 are inserted into and locked with the first slit holes 7a,7a serving as locking portions of the first locked plates 7,7 connected to the first vertical plates 4,4. This locks the front and rear top panels 6,6 together, restricting the opening of the top panels 6,6, and the unit can be carried by grasping the handle plates 8,8.

[0050] [Construction method of three-layer stacked packaging box] Next, we will explain how to create a stacked packaging box 1C with three layers (top, middle, and bottom) using three sheets 2A, 2B, and 2C. First, as shown in Fig. 9, packaging boxes formed from sheets 2A and 2B are stacked in two layers (top and bottom) in the same manner as the method for constructing stacked packaging box 1A, and the second plate portions 6b, 6b of the middle sheet 2B are folded outward along fold line f2. Next, the top sheet 2C is placed above the middle sheet 2B so that the bottom plate 3 of the packaging box formed from sheet 2C is shifted by approximately 90 degrees in plan view relative to the bottom plate 3 of the middle sheet 2B, centered on a rotation axis (not shown) facing up and down.

[0051] Next, as shown by the dotted arrow in Fig. 10, the second plate portions 6b, 6b and the handle plates 8, 8 of the middle sheet 2B are folded inward along the fold line f2 and placed above the upper sheet 2C, and then, as shown by the solid arrow in Fig. 10, the top plate 6, 6 of the upper sheet 2C is folded inward along the fold line f1 and placed above the second plate portions 6b, 6b of the middle sheet 2B. Next, after the handle plates 8, 8 are placed front to back, the locking portions 8a, 8a of the handle plates 8, 8 are locked into the second slit holes 18a, 18a of the middle sheet 2B, thereby connecting and integrating the upper, middle, and lower sheets 2A, 2B, 2C and restricting opening of the top plate 6, 6 of the upper sheet 2C. This forms a stacked packaging box 1C having upper, middle, and lower packaging portions 1a, 1a, 1a.

[0052] Furthermore, although not specifically shown, by placing the upper sheet 2C on top of the middle sheet 2B and folding the top panels 6, 6 of the upper sheet 2C outward along the fold line f2, it is possible to stack and connect a packaging box formed from a fourth sheet 2. By stacking a plurality of sheets 2 upward in this way, it is possible to form a stacked packaging box with four or more layers, but it is preferable to form a stacked packaging box with the number of layers depending on the size, weight, strength, etc. of the sheets 2.

[0053] [Actions and Effects] As described above, the laminated packaging boxes 1A, 1C and packaging box sheet 2 as embodiments of the present invention are formed by using a plurality of sheets 2A, 2B, 2C to form packaging sections 1a, 1a, 1a in the same number as the sheets 2A, 2B, 2C, and the sheets 2A, 2B, 2C each have a bottom panel 3, a pair of first vertical panels 4, 4, a pair of second vertical panels 5, 5, and top panels 6, 6 connected to the second vertical panels 5, 5, and the adjacent sheets 2A, 2B are arranged such that the bottom panels 3, 3 of the upper and lower sheets 2A, 2B are shifted by approximately 90 degrees, and the panel-shaped engaging portions consisting of the second panel portions 6b, 6b of the lower sheet 2A are engaged with the engaging portions on the upper edges of the first vertical panels 4, 4 and the third vertical panel 9 of the upper sheet 2B.

[0054] According to this, the multiple sheets 2A, 2B are stacked so that the bottom panels 3, 3 are offset by approximately 90 degrees in plan view, and the second panel portion 6b of the top panel 6 of the lower sheet 2A is engaged with the upper edges of the first vertical panel 4 and the third vertical panel 9 of the upper sheet 2B, thereby connecting the upper and lower stacked sheets 2A, 2B. This makes it easy to transport the multiple stacked packaging boxes without having to prepare dedicated connecting members or the like separately from the sheets 2A, 2B for connecting the packaging boxes of the stacked sheets 2A, 2B.

[0055] Furthermore, since no outer bag is required when carrying the packaging box, unnecessary resource consumption and costs are reduced, and multiple packaging boxes can be easily carried while maintaining their horizontal position. While a single-layer or multi-layered box can be used as a box-shaped package with a handle, the handle plate 8 can be made flat when the packaging box is closed, so it does not get in the way in situations where the handle plate 8 is not required, such as when packaging boxes are stacked. Furthermore, because sheets 2A, 2B, and 2C use a common sheet 2 that is approximately the same in shape, size, configuration, etc., the number of parts can be reduced.

[0056] Furthermore, since the top panel 6 of the upper sheet 2B overlaps the second plate portion 6b of the top panel 6 of the lower sheet 2A from above, the top panel 6 of the lower sheet 2A is engaged with the top panel 6 of the upper sheet 2B over a wide area, making the connection stronger.

[0057] Furthermore, since the bottom panel 3 of the upper sheet 2B is positioned on the upper edge of a pair of first vertical panels 4, 4 and a third vertical panel 9 that are bent vertically on the lower sheet 2A, the upper sheet 2B is stably positioned relative to the lower sheet 2A, making the connection state strong.

[0058] Furthermore, the second plate portion 6b of the top panel 6 of the lower sheet 2A is provided with a second slit hole 18a as an engaging portion that engages with the engaging portion 8a provided on the handle plate 8 of the upper sheet 2B, and since the second slit hole 18a of the top panel 6 of the lower sheet 2A is engaged with the engaging portion 8a provided on the handle plate 8 of the upper sheet 2B, the connection state is made strong.

[0059] Furthermore, a portion of the top panel 6 connected to the second elevation panel 5 of the lower sheet 2A is a first plate portion 6a that is a shared portion with the second elevation panel 5, and the height dimension L2 of the first plate portion 6a is the same length as the height dimension L4 of the first elevation panel 4 (L2 = L4). In other words, the combined height dimension L3 of the second elevation panel 5 and the first plate portion 6a of the lower sheet 2A is twice the length dimension of the height dimension L4 of the first elevation panel 4 (L3 = L4 × 2). Therefore, the second elevation panel 5 and first plate portion 6a of the lower sheet 2A have a height that spans the lower packaging box and the upper packaging box, so when stacked, the height of the entire elevation is roughly the same. This provides excellent stability when stacked.

[0060] Furthermore, a packaging box sheet 2 according to an embodiment of the present invention has a bottom panel 3, a pair of first vertical panels 4, 4, a pair of second vertical panels 5, 5, and top panels 6, 6 connected to the second vertical panels 5, 5, and a portion of the top panels 6, 6 connected to the second vertical panels 5, 5 is a first panel portion 6a, 6a that is a common portion with the second vertical panels 5, 5, and the height dimension L2 of the first panel portions 6a, 6a is the same as the height dimension L4 of the first vertical panels 4, 4 (L2 = L4). This allows both single-layer packaging boxes and laminated packaging boxes to be assembled using the same sheet 2.

[0061] Furthermore, the second vertical panels 5,5 can be folded at a fold line f1 that has the same height dimension as the height dimension L1 of the first vertical panels 4,4, and by using a common sheet 2 that has the same shape, size, etc., it is possible to form not only stacked packaging boxes 1A,1C but also single-layer packaging box 1B.

[0062] Furthermore, the sheet 2 is provided with a locking portion 8a, and the first vertical panel 4 and the top panel 6 are provided with a first slit hole 7a and a second slit hole 18a as locking portions to which the locking portion 8a is locked, so that the locking portion 8a can be locked into the first slit hole 7a or the second slit hole 18a whether a single-layer packaging box or a multi-layer packaging box is formed, thereby reducing the number of parts.

[0063] The sheet 2 also has handle plates 8 that are connected to each top panel 6 and that function as handles when stacked together. The handle plates 8 are made up of a cut-out piece 8c that is separated from the top panel 6 by a cut in half of the width of the top panel 6, and a connecting piece 8d that is connected to the remaining half of the width. By stacking one cut-out piece 8c on the opposite side of the other connecting piece 8d, the handle plates 8, 8 are prevented from separating and being opened.

[0064] Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention also includes modifications and additions that do not deviate from the gist of the present invention.

[0065] For example, in the above embodiment, a stacked packaging box can be formed by using multiple common sheets 2 that are substantially identical in shape, size, configuration, etc., and whose top panel 6 can be folded along either fold line f1 or f2. However, a stacked packaging box may also be formed using sheets with different shapes, sizes, etc. For example, a stacked packaging box may be formed using a sheet 2A dedicated to the lower tier that has only fold line f2 and a sheet 2B dedicated to the upper tier that has only fold line f1. In other words, the multiple sheets may differ in part in shape, size, etc., as long as they have substantially the same configuration, etc.

[0066] Furthermore, in the above embodiment, a configuration has been illustrated in which a stacked packaging box and a single-layer packaging box can be formed by using a common sheet 2 that is substantially identical in shape, size, configuration, etc. and whose top panel 6 can be folded along either fold line f1 or f2, but the present invention is not limited to this, and the sheets that form the stacked packaging box and the sheets that form the single-layer packaging box may differ in part in shape, size, configuration, etc. For example, a stacked packaging box may be formed using sheets 2A and 2B that have fold lines f1 and f2, while a single-layer packaging box may be formed using a dedicated single-layer sheet that has only fold line f1.

[0067] In addition, in the above-mentioned embodiments, the stacked packaging boxes 1A and 1C are exemplified as having the top panel 6 of the upper sheet 2B overlapping from above on the top panel 6 of the lower sheet 2A, but the present invention is not limited to this, and for example, the top panel 6 of the lower sheet 2A may be overlapped so as to be engaged on the bottom panel 3 rather than on the upper edge of the first vertical panel 4 of the upper sheet 2B.

[0068] Furthermore, in the above embodiment, a configuration is illustrated in which the bottom panel 3 of the upper sheet 2B is positioned on the upper edge of the first vertical panel 4 of the lower sheet 2A, but the present invention is not limited to this, and the bottom panel 3 of the upper sheet 2B may be placed on a support piece (not shown) or the like protruding from the inner surface of the second vertical panel 5 of the lower sheet 2A.

[0069] In addition, in the above embodiment, a form is exemplified in which the top panel 6 of the seat 2 is provided with a second slit hole 18a as an engaging portion that engages with the engaging portion 8a provided on the seat 2, but the present invention is not limited to this, and the engaging portion may be provided in a location other than the top panel 6, such as a part of the second vertical panel 5.

[0070] In addition, in the above embodiment, the height dimension L3 of the second vertical panel 5 of the lower sheet 2A is exemplified as being twice the height dimension L4 of the first vertical panel 4, but the present invention is not limited to this and the height dimension may be more than twice as large, thereby allowing the bottom panel of the lower layer to be engaged with sheets stacked two or more layers above.

[0071] In addition, in the above embodiment, the second vertical panel 5 is exemplified as being able to be folded along the fold line f1 to have the same height dimension L3 as the first vertical panel 4, but the present invention is not limited to this, and the fold line f1 does not necessarily have to be provided.

[0072] In the above embodiment, the seat 2 has a handle plate 8, and the handle plate 8 is configured to have a cutout piece 8c that is separated from the top panel 6 by a cutout in half of the width direction of the top panel 6, and a connecting piece 8d that is connected to the remaining half of the width direction, but the present invention is not limited to this, and the handle plate 8 does not necessarily have to have the cutout piece 8c and the connecting piece 8d. Also, the seat does not necessarily have to have a handle portion. [Industrial Applicability]

[0073] The laminated packaging box and packaging box sheet of the present invention can also be used for packaging foods such as pizza, cakes, sweets such as tarts, ice cream, and pasta, prepared dishes, meal kits, flowers, adhesives, sealants, small toys, stationery, coins, and the like. [Explanation of symbols]

[0074] 1A, 1C stacked packaging box 1B Single-layer packaging box 1a Packaging department 2. Packaging box sheets (sheets) Seats 2A-2C 3 Bottom plate 4 1st elevation plate 5 Second elevation board 6 Top plate 6a 1st plate section (common area) 6b 2nd plate part 7 First locked plate (locked part) 7a First slit hole 8 Handle plate (handle part) 8a Locking part 8b Hole 8c cut piece 8d continuous piece 9 Third elevation plate 10 4th elevation board 11 Folding board 15~17 Cutout 18 Second locked plate 18a Second slit hole (locked portion) f1,f2 fold lines

Claims

1. A laminated packaging box formed by using a plurality of sheets to form packaging sections of the same number as the sheets, The seat has a bottom plate, a pair of first upright plates, a pair of second upright plates, and a top plate connected to the second upright plates, The stacked packaging box is characterized in that the top panel of the lower sheet is engaged with the top panel of the upper sheet, with the bottom panels of the upper and lower adjacent sheets being shifted by approximately 90 degrees.

2. 2. The stacked packaging box according to claim 1, wherein the top plate of the sheet in the upper layer overlaps the top plate of the sheet in the lower layer from above.

3. 2. The laminated packaging box according to claim 1, wherein the bottom plate of the upper sheet is disposed on the pair of first upright plates folded upright of the lower sheet.

4. 2. The stacked packaging box according to claim 1, wherein a top panel of the lower sheet is provided with a latched portion that latches onto a latching portion provided on the upper sheet.

5. 2. The stacked packaging box according to claim 1, wherein a portion of the top panel connected to the second vertical panel in the lower row is a common portion with the second vertical panel, and the common portion has the same length as the first vertical panel.

6. A packaging box sheet having a bottom plate, a pair of first upright plates, a pair of second upright plates, and a top plate connected to the second upright plates, A sheet for packaging boxes, characterized in that a portion of the top panel connected to the second vertical panel is a common portion with the second vertical panel, and the common portion has the same length as the first vertical panel.

7. The seat has a locking portion, 7. The packaging box sheet according to claim 6, wherein the first upright panel and the top panel are provided with latched portions to which the latching portions are latched.

8. Each of the top panels has a handle portion that is connected to the top panel and serves as a handle when stacked. The sheet for packaging boxes according to claim 6, characterized in that the handle portion consists of a cut piece that is separated from the top panel by a cut in half of the width of the top panel, and a connected piece that is connected to the remaining half of the width.

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