Packaging box

Abstract

To provide a packaging box capable of easily sealing an article while protecting it.SOLUTION: A packaging box 1 according to the present invention comprises: a box body 5 formed by alternately arranging a pair of first side walls 11 and a pair of second side walls 12 around the periphery of a bottom wall (foundation part) so as to open one side; a protective portion 14 connected to the tip of the front (one side) first side wall 11 and placed in an interior space S1 of the box body 5; and a lid portion 15 connected to the tip of the rear (the other) first side wall 11 and closing one side of the box body 5, wherein the protective portion 14 includes a pair of partition plates 31 positioned between the articles 90 contained in the interior space S1 and the pair of second side walls 12, wherein the pair of partition plates 31 face each other with a pair of insertion grooves 33 sandwiched between the pair of partition plates and the inner surfaces of the pair of second side walls 12, and wherein the lid portion 15 includes a pair of insertion plates 41 inserted into a pair of insertion grooves 33 when closing one side of the box body 5.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a packaging box. [Background technology]

[0002] A knockdown packaging box is known in which the top opening of a main body, which has side panels erected on the outer periphery of a bottom panel, is closed by a top cover plate connected to the rear side panel (Patent Document 1). A pair of top cover insertion pieces that are inserted into the main body along the inner surfaces of the left and right side panels are connected to the left and right ends of the top cover plate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-76113 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned packaging box, after storing the article in the main body, when closing the top cover plate, a pair of top cover insertion pieces must be inserted between the left and right side plates and the article. Therefore, the top cover insertion pieces are likely to come into contact with the article, and there is a risk of damaging the article. In addition, the top cover insertion pieces must be carefully inserted between the side plates and the article to avoid damaging the article, which causes a problem that the work of closing the top cover plate (sealing the packaging box) takes time and effort.

[0005] In consideration of the above circumstances, the present invention provides a packaging box that can be easily sealed while protecting an article. [Means for solving the problem]

[0006] The packaging box comprises a box body formed with a pair of first side walls and a pair of second side walls alternately arranged around the peripheral portion of a base portion to open one side, a protective portion connected to an end of one of the pair of first side walls and arranged in an internal space of the box body, and a lid portion connected to an end of the other of the pair of first side walls to close the one side of the box body, wherein the protective portion includes a pair of partition plates arranged between an item to be stored in the internal space and the pair of second side walls, the pair of partition plates facing each other with a pair of insertion grooves between them and the inner surfaces of the pair of second side walls, and the lid portion includes a pair of insertion plates to be inserted into the pair of insertion grooves when closing the one side of the box body.

[0007] In this case, it is preferable that one of the second side wall and the partition plate be provided with a groove retaining piece that protrudes toward the other of the second side wall and the partition plate and contacts the other of the second side wall and the partition plate.

[0008] In this case, the second side wall has a second outer wall connected to an edge portion of the base portion, and a second inner wall connected to the tip of the second outer wall and folded inwardly to face the second outer wall, and the groove retaining piece is connected to at least one of both side edges of the second inner wall and is folded so as to protrude toward the internal space while interfering with the first side wall in the process of folding the second inner wall inward.

[0009] In this case, the protective portion may include an inner cover plate extending from an end of one of the pair of first side walls toward the other first side wall and spanning between the pair of partition plates to cover a portion of the one surface of the box body. Effect of the Invention

[0010] According to the present invention, the packaging box can be easily sealed while protecting the article. [Brief description of the drawings]

[0011] [Figure 1]1 is a perspective view showing a packaging box according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a plan view showing a blank for a packaging box according to one embodiment of the present invention. [Diagram 3] 1 is a perspective view showing a state in which one second side wall of the packaging box according to one embodiment of the present invention has been formed. FIG. [Figure 4] 11 is a perspective view showing a process of forming the other second side wall of the packaging box according to one embodiment of the present invention. FIG. [Diagram 5] 10 is a perspective view showing a process of accommodating a protective part in a box body of a packaging box according to an embodiment of the present invention; FIG. [Figure 6] 1 is a plan view showing a state in which a protective section is housed in a box body of a packaging box according to an embodiment of the present invention. FIG. [Figure 7] 1 is a perspective view showing a process of closing the lid of the packaging box according to one embodiment of the present invention. FIG. [Figure 8] FIG. 2 is a plan view showing a blank for a packaging box according to a first modified example of an embodiment of the present invention. [Figure 9] FIG. 11 is a plan view showing a blank for a packaging box according to a second modified example of one embodiment of the present invention. [Figure 10] FIG. 11 is a plan view showing a blank for a packaging box according to a third modified example of one embodiment of the present invention. [Figure 11] FIG. 11 is a plan view showing a blank for a packaging box according to a fourth modified example of an embodiment of the present invention. [Figure 12] FIG. 13 is a plan view showing a blank for a packaging box according to a fifth modified example of one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the attached drawings. Note that Fr, Rr, L, R, U, and D shown in the drawings indicate front, rear, left, right, top, and bottom. The front-rear direction, left-right direction, and up-down direction are mutually perpendicular. Terms indicating directions and positions are used in this specification, but these terms are used for convenience of explanation and do not limit the technical scope of the present invention. In addition, the terms indicating directions and positions are based on the directions and positions in the state in which the packaging box is assembled and used.

[0013] A packaging box 1 according to this embodiment will be described with reference to Figures 1 and 2. Figure 1 is a perspective view showing the packaging box 1. Figure 2 is a plan view showing a blank 1A of the packaging box 1.

[0014] As shown in Fig. 1, the packaging box 1 is formed into a substantially rectangular parallelepiped shape as a whole. The packaging box 1 is sealed by closing the top surface (one surface) of the box body 5 that contains the item 90 with a lid 15. Note that the item 90 is, for example, a soft item that is easily damaged, such as vegetables or fruits, but is not limited thereto, and may be any item that can be contained inside the packaging box 1 (box body 5).

[0015] The packaging box 1 is assembled from a blank 1A shown in Fig. 2. The blank 1A is punched out of a single piece of cardboard paper using a die or the like, and the cardboard sheet is a double-sided cardboard sheet with a corrugated core 9A and liners bonded to both the front and back sides. Note that Fig. 2 shows the front (outer) side. In this specification, the direction parallel to the core 9A of the cardboard sheet is referred to as the "corrugation direction," and the direction perpendicular to the corrugation direction is referred to as the "flow direction." In the drawings, "X" indicates the "corrugation direction," and "Y" indicates the "flow direction."

[0016] [blank] 2, the blank 1A includes a bottom wall 10, a pair of first side walls 11, a pair of second side walls 12, two pairs (four) of fold-in pieces 13, a protective portion 14, and a lid portion 15. In FIG. 2, the pair of first side walls 11 are formed generally symmetrically in the up-down direction, and the pair of second side walls 12 are formed generally symmetrically in the left-right direction, so that in this specification, one first side wall 11 and one second side wall 12 will be mainly described.

[0017] <Bottom wall, first side wall, second side wall> The bottom wall 10, which is an example of a foundation, is formed in a substantially rectangular shape that is long in the step direction. The pair of first side walls 11 are connected to both ends of the bottom wall 10 in the step direction (front-rear direction) via a first folding line L1. The pair of second side walls 12 are arranged on both sides of the bottom wall 10 in the flow direction (left-right direction). The second side wall 12 has a second outer wall 20 connected to an end (edge) of the bottom wall 10 in the flow direction via a second folding line L2, and a second inner wall 21 connected to a tip end of the second outer wall 20 in the flow direction via a pair of third folding lines L3. The first side wall 11, the second outer wall 20, and the second inner wall 21 are formed in a substantially rectangular shape. The height (dimension in the step direction) of the first side wall 11 is slightly lower than the height (dimension in the flow direction) of the second outer wall 20 and the second inner wall 21.

[0018] <Details of the second side wall> The pair of third fold lines L3 are formed substantially parallel to the step direction, and a frame portion 22 is formed between the pair of third fold lines L3. The second inner side wall 21 is connected to the second outer side wall 20 via the frame portion 22. The frame portion 22 is formed to have a width (dimension in the flow direction) equal to or greater than the thickness of one cardboard sheet. A substantially semicircular finger hook recess 23 is recessed at the end of the second inner side wall 21 in the flow direction and at the substantially center in the step direction. In addition, a pair of engagement protrusions 24 are protrudingly provided on both sides in the step direction, sandwiching the finger hook recess 23, at the end of the second inner side wall 21 in the flow direction. Four engagement holes 25 are drilled in the bottom wall 10 along the boundary (second fold line L2) with the pair of second outer side walls 20. Details will be described later, but the four engagement holes 25 correspond to two pairs of engagement protrusions 24, and each engagement protrusion 24 fits (engages) with the engagement hole 25 when the second side wall 12 is formed.

[0019] (Groove holding piece) A groove retaining piece 26 is connected to the side end (rear end (upper side in FIG. 2)) of the second inner wall 21 in the step direction via a groove retaining fold line L10. The groove retaining piece 26 is formed in a substantially rectangular shape with a chamfered tip corner, and is provided in the vicinity (upper side) of the frame portion 22 of the rear end of the second inner wall 21. The groove retaining piece 26 is provided so as to slightly bite into the second inner wall 21, and is separated from the second inner wall 21 by a cut. The groove retaining fold line L10 is formed at a position shifted forward from the rear end of the second inner wall 21, and the groove retaining piece 26 is formed so as to protrude rearward from the rear end of the second inner wall 21. Note that the groove retaining fold line L10 is formed at a position shifted forward from the rear end of the second inner wall 21, but is not limited thereto, and may be formed on the same straight line as the rear end of the second inner wall 21 (not shown).

[0020] <Fold-in piece> The two pairs of folding pieces 13 are connected to both ends of the pair of first side walls 11 in the flow direction (left-right direction) via the fourth folding line L4. Each folding piece 13 is formed in a substantially rectangular shape and extends outward in the flow direction while contacting both ends (side ends) of the pair of second outer walls 20 in the step direction. Each folding piece 13 at the front (lower side in FIG. 2) is formed longer in the flow direction than each folding piece 13 at the rear (upper side in FIG. 2). Each folding piece 13 at the front is formed slightly longer than the combined dimension of the second outer wall 20 and the frame portion 22 in the flow direction, and each folding piece 13 at the rear is formed slightly shorter than the dimension of the second outer wall 20 in the flow direction.

[0021] <Protection Department> The protective part 14 is connected to the tip of the front first side wall 11. Although details will be described later, the protective part 14 is disposed in the internal space S1 of the box body 5 and covers a part (front part) of the upper surface (upper surface opening) of the box body 5. The protective part 14 includes an inner cover plate 30 and a pair of partition plates 31.

[0022] (Inner cover plate) The inner cover plate 30 is connected to the leading end of the first side wall 11 in the step direction via the fifth fold line L5. The inner cover plate 30 is formed to be approximately half the size of the bottom wall 10 in the step direction, and an arc-shaped recess is formed on the leading end side (free end side) of the inner cover plate 30. In addition, the dimension (left and right width) of the inner cover plate 30 in the flow direction is shorter than the dimension (left and right width) of the bottom wall 10 in the flow direction. The inner cover plate 30 has a locking hole 32 formed along the boundary (fifth fold line L5) with the first side wall 11. The locking hole 32 is a substantially U-shaped (C-shaped) cut that protrudes from the fifth fold line L5 toward the inner cover plate 30, and divides the middle part of the fifth fold line L5 in the flow direction.

[0023] (Partition) The pair of partition plates 31 are connected to both ends of the inner cover plate 30 in the flow direction via the sixth folding line L6. The pair of partition plates 31 are symmetrical about the inner cover plate 30, and each is formed in a substantially rectangular shape having approximately the same size as the second inner side wall 21. The dimension of each partition plate 31 in the step direction is approximately twice the dimension of the inner cover plate 30 in the step direction, and only the base end side (first side wall 11 side) of each partition plate 31 in the step direction is connected to the inner cover plate 30. An approximately U-shaped opening is formed on the tip side of the step direction from the inner cover plate 30 and between the pair of partition plates 31. The tip side of the pair of partition plates 31 in the step direction is inclined from the center side in the flow direction toward the base end side in the step direction toward the outside. The boundary (sixth fold line L6) between the inner cover plate 30 and the pair of partition plates 31 is shifted toward the center in the flow direction (left-right direction) from the boundary (fourth fold line L4) between the first side wall 11 and the pair of folding pieces 13. The front pair of folding pieces 13 are formed longer than the dimension (height) of the pair of partition plates 31 in the flow direction.

[0024] <Lid> The lid portion 15 is connected to the tip of the rear first side wall 11. Although details will be described later, the lid portion 15 closes the upper surface (upper surface opening) of the box body 5. The lid portion 15 includes an outer lid plate 40, a pair of insertion plates 41, and a locking piece 42.

[0025] (outer cover plate) The outer cover plate 40 is connected to the leading end of the rear first side wall 11 in the step direction via the seventh fold line L7. The outer cover plate 40 is formed in a substantially rectangular shape having roughly the same size as the bottom wall 10. In detail, the flow direction dimension (left-right width) of the outer cover plate 40 is slightly wider than the left-right width of the inner cover plate 30 and slightly narrower than the left-right width of the bottom wall 10.

[0026] (Insertion board) The pair of insert plates 41 are connected to both ends of the outer cover plate 40 in the flow direction via the eighth folding line L8. The pair of insert plates 41 are symmetrical with respect to the outer cover plate 40, and each is formed in a substantially trapezoidal shape that is slightly smaller than the partition plate 31. In detail, each insert plate 41 has a hypotenuse that is inclined outward in the flow direction from the tip corner of the outer cover plate 40 in the step direction toward the base end (rear folding piece 13), and is formed in a substantially trapezoidal shape that narrows in the step direction as it moves away from the eighth folding line L8 to the outside in the flow direction. More specifically, the base end side in the step direction of each insert plate 41 is formed in a substantially rectangular shape with approximately the same width in the flow direction, and the other parts are formed in a substantially right-angled triangular shape that gradually narrows toward the tip in the step direction. The maximum dimension (height) of each insert plate 41 in the flow direction is shorter (lower) than the dimension (height) of the partition plate 31 in the flow direction. The pair of rear folding pieces 13 are formed longer than the dimension (height) in the flow direction of the pair of insertion plates 41. A substantially trapezoidal relief recess 43 is recessed in the base end of each insertion plate 41. The relief recess 43 is provided in the vicinity (upper side) of the eighth fold line L8 of the base end of each insertion plate 41.

[0027] (Lock piece) The locking piece 42 is connected to the leading end of the outer cover plate 40 in the step direction and approximately in the center in the flow direction via the ninth fold line L9. The locking piece 42 is formed in a generally trapezoidal shape that narrows in the flow direction toward the leading end in the step direction. The base end of the locking piece 42 (near the ninth fold line L9) is narrowed in the flow direction.

[0028] The first to ninth fold lines L1 to L9 are general-purpose creases formed by indenting the cardboard sheet from the back (inner surface), and the groove retaining fold line L10 is a lead crease formed by perforating the general-purpose crease. However, the first to ninth fold lines L1 to L9 and the groove retaining fold line L10 may be of any structure that folds the cardboard sheet in the desired direction.

[0029] [Sealing packaging boxes] Next, an example of the work (sealing work) of assembling the packaging box 1, storing an article 90 therein, and sealing the box will be described with reference to Fig. 1 and Fig. 3 to Fig. 7. Fig. 3 is a perspective view showing a state in which one of the second side walls 12 has been formed. Fig. 4 is a perspective view showing a process of forming the other of the second side walls 12. Fig. 5 is a perspective view showing a process of storing the protective part 14 in the box main body 5. Fig. 6 is a plan view showing a state in which the protective part 14 has been stored in the box main body 5. Fig. 7 is a perspective view showing a process of closing the lid part 15.

[0030] The packaging box 1 is assembled by appropriately folding the blank 1A with the back surface (inner surface) facing upward. Here, the process by which a worker manually assembles the packaging box 1 from the blank 1A is described. In this specification, folding the cardboard sheet so that the back surface (inner surface) faces inward is called "normal folding," and folding the cardboard sheet so that the front surface (outer surface) faces inward is called "reverse folding."

[0031] The worker folds the first side wall 11 forward along the first fold line L1, and folds the folding piece 13 forward along the fourth fold line L4 (see FIG. 3). The pair of first side walls 11 are erected at both front and rear ends of the bottom wall 10 (see FIG. 3). The two pairs of front and rear folding pieces 13 extend from both left and right ends of the pair of first side walls 11 so as to approach each other, and are erected along both left and right ends of the bottom wall 10 (second fold line L2) (see FIG. 3). Since each folding piece 13 extends outward in the left-right direction beyond the protective portion 14 and the lid portion 15 in the blank 1A state (see FIG. 2), the worker can easily fold the folding piece 13 by hooking his / her fingers on the tip of each folding piece 13.

[0032] Next, the worker folds the second outer wall 20 forward along the second folding line L2, and folds the frame portion 22 and the second inner wall 21 forward along a pair of third folding lines L3 (see FIG. 3). The pair of second outer walls 20 are erected on both the left and right ends of the bottom wall 10, and cover the outer surfaces of the two pairs of front and rear folding pieces 13. The frame portion 22 extends from the upper end of the second outer wall 20 toward the center in the left-right direction, and covers the upper ends of the pair of front and rear folding pieces 13. The second inner wall 21 extends downward from the tip of the frame portion 22, and covers the inner surfaces of the pair of front and rear folding pieces 13. The second inner wall 21 is folded back inward with respect to the second outer wall 20, and faces the second outer wall 20 with the pair of front and rear folding pieces 13 in between. In other words, the second outer wall 20 and the second inner wall 21 constitute the second side wall 12 having a double-wall structure (see FIG. 3). The engagement projection 24 fits into an engagement hole 25 in the bottom wall 10 to hold the second inner wall 21 in a folded-back state.

[0033] As a result of the above, a pair of first side walls 11 and a pair of second side walls 12 are alternately arranged around the periphery of the bottom wall 10, forming a box body 5 with an open top surface (one surface).

[0034] Incidentally, since groove retaining piece 26 (its tip portion (rear end portion)) protrudes rearward from the rear end of second inner wall 21, when second inner wall 21 is folded inward, it interferes with (comes into contact with) the inner surface of rear first side wall 11 (or outer cover plate 40 or insertion plate 41) as shown in FIG. 4. At this time, groove retaining piece 26 is subjected to a frictional force (a force in the opposite direction to the folding direction of second inner wall 21) from first side wall 11 etc., and is folded backward along groove retaining fold line L10. In other words, groove retaining piece 26 is folded so as to protrude toward internal space S1 of box body 5 while interfering with first side wall 11 in the process of folding second inner wall 21 inward. When the second outer wall 20 and the second inner wall 21 form a double wall, the groove retaining piece 26 has its tip (rear end) in contact with the inner surface of the rear first side wall 11, and is inclined toward the center in the left-right direction from the groove retaining fold line L10 toward the rear (first side wall 11) when viewed from a plane (see Figure 6).

[0035] Next, as shown in FIG. 5, the worker folds the pair of partition plates 31 along the sixth fold line L6, folds the inner cover plate 30 along the fifth fold line L5, and places the protective part 14 in the internal space S1 of the box body 5. As shown in FIG. 6, the pair of partition plates 31 are placed between the article 90 to be stored in the internal space S1 and the pair of second side walls 12. The inner cover plate 30 extends from the tip (upper end) of the front first side wall 11 toward the rear first side wall 11 and is bridged between the pair of partition plates 31 to close the front part (part of one surface) of the upper surface of the box body 5 (internal space S1). The rear part of the upper surface of the box body 5 (internal space S1) is open.

[0036] In the process of folding (rotating) the inner cover plate 30 at the fifth folding line L5, the pair of partition plates 31 enter the internal space S1 while contacting the pair of groove retaining pieces 26 protruding from the pair of second inner side walls 21 toward the internal space S1 (the center in the left-right direction). As shown in FIG. 6, the groove retaining pieces 26 contact the partition plates 31 and prevent the partition plates 31 from approaching (contacting) the second side walls 12 (the second inner side walls 21). Therefore, the pair of partition plates 31 are separated inward (toward the center in the left-right direction) from the pair of second side walls 12 and face each other with a pair of insertion grooves 33 between them and the inner surfaces of the pair of second side walls 12 (the second inner side walls 21). The pair of partition plates 31 also divide the internal space S1 of the box body 5 into a storage space S2 for the article 90 and the pair of insertion grooves 33. The groove retaining piece 26 crosses the insertion groove 33, contacts the partition plate 31 that forms the insertion groove 33, and maintains the width (dimension in the left-right direction) of the insertion groove 33. The width (dimension in the left-right direction) of the insertion groove 33 is set to be equal to or greater than the thickness of the cardboard sheet (insertion plate 41), and more specifically, for the purpose of facilitating the insertion of the insertion plate 41 and ensuring a wide storage space S2, it is preferable to set the width to about two to three times the thickness of the cardboard sheet. In addition, in FIG. 6, the tip of the partition plate 31 contacts the surface of the groove retaining piece 26, but this is not limiting, and the tip of the groove retaining piece 26 may contact the surface of the partition plate 31.

[0037] Next, the worker stores the article 90 inside (the storage space S2) of the box body 5. Specifically, the worker inserts the article 90 into the storage space S2 partitioned between the pair of partition plates 31 from the rear of the top opening that is not covered by the inner cover plate 30 (see FIG. 6).

[0038] Next, as shown in FIG. 7, the worker folds the pair of insertion plates 41 along the eighth fold line L8 and folds the locking piece 42 along the ninth fold line L9. The worker also folds the outer cover plate 40 along the seventh fold line L7 while inserting the pair of insertion plates 41 into the pair of insertion grooves 33. The worker also folds the outer cover plate 40 along the seventh fold line L7 while inserting the locking piece 42 into the locking hole 32 of the inner cover plate 30. The outer cover plate 40 extends from the tip (upper end) of the rear first side wall 11 to the front first side wall 11, overlaps the upper surface of the inner cover plate 30, and closes the entire upper surface (one surface) of the box body 5 (see FIG. 1). The pair of insertion plates 41 are inserted into the pair of insertion grooves 33 when closing the upper opening of the box body 5 (see FIG. 7). Since the storage space S2 and the insertion groove 33 are separated by the partition plate 31, the insertion plate 41 does not come into contact with the article 90 while being inserted into the insertion groove 33. Note that the illustration of the article 90 is omitted in FIG. 7. Furthermore, when the insertion plate 41 is inserted into the insertion groove 33, the groove retaining piece 26 enters the escape recess 43 of the insertion plate 41 (not shown). The locking piece 42 is inserted into the locking hole 32 to fix the outer cover plate 40 (see FIG. 1). This maintains the outer cover plate 40 closing the top opening of the box body 5.

[0039] In the packaging box 1 according to the present embodiment described above, the partition plate 31 of the protective portion 14 is disposed between the article 90 and the second side wall 12, and the insertion groove 33 is formed between the second side wall 12 (see FIG. 6). According to this configuration, when the lid portion 15 is closed, the insertion plate 41 can be inserted into the insertion groove 33 formed between the second side wall 12 and the partition plate 31, so that the insertion plate 41 is prevented from contacting (interfering with) the article 90. This can prevent defects such as scratches on the article 90. As a result, even soft and easily scratched articles 90 such as vegetables can be properly packed. In addition, since there is no risk of the insertion plate 41 contacting the article 90, the worker does not need to be overly careful when inserting the insertion plate 41 into the insertion groove 33, and the operation of closing the lid portion 15 (sealing operation) can be easily performed in a short time. As described above, the packaging box 1 can be easily sealed while protecting the article 90. Furthermore, since the left and right sides of the box body 5 form a triple wall with the second side wall 12, the insert plate 41 and the partition plate 31, the stored items 90 can be effectively protected.

[0040] Furthermore, in the packaging box 1 according to this embodiment, the groove retaining piece 26 protrudes from the second inner side wall 21 toward the partition plate 31 (the internal space S1 (the center in the left-right direction)) and contacts the partition plate 31 that forms the insertion groove 33 (see FIG. 6). With this configuration, the groove retaining piece 26 acts as an obstacle to prevent the partition plate 31 from contacting the second inner side wall 21, and the distance between the second side wall 12 and the partition plate 31 (the groove width of the insertion groove 33) can be kept roughly constant. This makes it easier for the worker to insert the insertion plate 41 into the insertion groove 33, and allows the worker to close the lid portion 15 more efficiently.

[0041] In addition, in the packaging box 1 according to this embodiment, the groove retaining piece 26 connected to the rear side edge of the second inner wall 21 is bent so as to protrude toward the internal space S1 by contacting the rear first side wall 11 as the second inner wall 21 is folded back (see FIG. 4). With this configuration, the groove retaining piece 26 can be automatically provided to protrude into the internal space S1 simply by forming the second side wall 12. This allows the packaging box 1 (box body 5) to be quickly assembled.

[0042] In addition, according to the packaging box 1 of this embodiment, the inner cover plate 30 and the pair of partition plates 31 are integrated to form the protective portion 14, so that the pair of insertion grooves 33 can be quickly formed by simply arranging the protective portion 14 in the internal space S1 of the box body 5. In addition, a part of the top opening of the box body 5 is doubly covered by the inner cover plate 30 and the outer cover plate 40, so that the contained article 90 can be effectively protected.

[0043] In the packaging box 1 according to the present embodiment, the groove retaining piece 26 is provided at the rear end of the second inner wall 21, but the present invention is not limited thereto. For example, the groove retaining piece 26 may be provided at the front end of the second inner wall 21, or a pair of groove retaining pieces 26 may be provided at both front and rear ends of the second inner wall 21 (not shown). Even in these configurations, the groove retaining piece 26 can be automatically protruded into the internal space S1 by simply forming the second side wall 12. Also, for example, the groove retaining piece 26 may be formed by making a substantially U-shaped cut at any position of the second inner wall 21 except for both front and rear ends (not shown). In this case, the worker may fold the groove retaining piece 26 from the second inner wall 21 along the U-shaped cut (not shown). Also, in this case, in order to prevent the insertion plate 41 from interfering with the groove retaining piece 26, the formation position of the relief recess 43 may be changed to match the position of the groove retaining piece 26 (not shown).

[0044] In addition, in the packaging box 1 according to the present embodiment, the groove retaining piece 26 is provided on the second inner side wall 21 (second side wall 12), but the present invention is not limited thereto. For example, as shown in FIG. 8, the groove retaining piece 26 may be provided on the leading end (rear end) of the partition plate 31 of the protective part 14 (first modified example). Also, for example, the groove retaining piece 26 may be provided on the front end of the partition plate 31, or may be formed by making a substantially U-shaped cut at any position of the partition plate 31 except for the front and rear ends (neither is shown). In these cases, the groove retaining piece 26 is manually bent by an operator to protrude from the partition plate 31 toward the second side wall 12 and contact the second side wall 12 (not shown).

[0045] In addition, in the packaging box 1 according to the present embodiment, the inner lid plate 30 of the protective portion 14 is bridged between a pair of partition plates 31, but the present invention is not limited to this. For example, as shown in Fig. 9, the inner lid plate 30 may be divided into two, and each partition plate 31 may be connected to the inner lid plate 30 (third modified example). Also, for example, as shown in Fig. 10, each partition plate 31 may be connected to the first side wall 11 via a connecting portion 34 instead of the inner lid plate 30 (third modified example).

[0046] In addition, in the packaging box 1 according to the present embodiment, the groove retaining piece 26 is provided so as to protrude from the second side wall 12 and the partition plate 31, but this is not limited thereto, and the tip of the groove retaining piece 26 may be formed in the same straight line as the end of the second side wall 12, etc. (not shown). Also, as long as the upper side of the partition plate 31 can be separated from the second inner side wall 21, the groove retaining piece 26 may be omitted (not shown).

[0047] In addition, in the packaging box 1 according to the present embodiment, the inner lid plate 30 is installed on the base end side (front side) of the pair of partition plates 31, but this is not limited thereto, and for example, as shown in Fig. 11, the inner lid plate 30 may be installed on the tip side (rear side) in addition to the base end side of the pair of partition plates 31 (fourth modified example). Also, the inner lid plate 30 may be installed only on the tip side (rear side) instead of the base end side of the pair of partition plates 31 (see the two-dot chain lines (phantom lines) in Figs. 9 and 10).

[0048] In addition, in the packaging box 1 according to the present embodiment, the second outer wall 20 and the second inner wall 21 are connected via a pair of third fold lines L3 (frame portion 22), but the present invention is not limited thereto. For example, the frame portion 22 may be omitted, and the second outer wall 20 and the second inner wall 21 may be connected via one third fold line L3 (not shown). In addition, the second side wall 12 is a double wall in which the second outer wall 20 and the second inner wall 21 face each other, but the present invention is not limited thereto. For example, as shown in FIG. 12, the second inner wall 21 may be omitted, and the second side wall 12 may be composed of one wall (for example, only the second outer wall 20) (fifth modified example). In this case, the folding piece 13 may be bonded to the inner surface of the second outer wall 20. In addition, the groove holding piece 26 may be provided on the tip side (free end side) of the folding piece 13, and the position of the relief recess 43 may be changed to match the position of the groove holding piece 26 (not shown). Additionally, the groove retaining piece 26 may be provided on the second outer wall 20 or on the partition plate 31 (neither is shown). The features of the first to fifth modified examples may be mutually applied.

[0049] In addition, in the packaging box 1 according to the present embodiment, the outer cover plate 40 is fixed (the packaging box 1 is sealed) by inserting the locking piece 42 into the locking hole 32, but the present invention is not limited to this. For example, the locking piece 42 may be omitted, and the outer cover plate 40 may be fixed to the inner cover plate 30 using an adhesive tape or adhesive (not shown).

[0050] In addition, in the packaging box 1 according to the present embodiment, the bottom wall 10 is an example of the base portion, but the present invention is not limited thereto. Although not shown, for example, a pair of first side walls and a pair of second side walls are alternately arranged in a row, and another example of the base portion may be composed of an inner flap connected to the lower end of each first side wall and an outer flap connected to the lower end of each second side wall. In this case, the pair of first side walls and the pair of second side walls are formed into a square tube, and the pair of inner flaps and the pair of outer flaps are folded in this order to close the bottom of the square tube. In addition, as another example of the base portion, the bottom of the square tube may be a so-called one-touch bottom or a bottom (not shown).

[0051] In addition, in the packaging box 1 according to the present embodiment, the protective part 14 is placed in the internal space S1 of the box body 5, and then the article 90 is stored therein, but the present invention is not limited thereto. For example, the protective part 14 may be placed in the internal space S1 after the article 90 is stored in the internal space S1 of the box body 5. However, in this case, the protective part 14 is placed in the internal space S1 while being careful not to contact the partition plate 31 with the article 90, so it is preferable to place the protective part 14 in the internal space S1 before storing the article 90, as described above. In addition, in the packaging box 1 according to the present embodiment, the bottom wall 10 is the bottom surface, and the inner cover plate 30 and the outer cover plate 40 are the top surfaces, but this is not limited thereto, and for example, one of the pair of first side walls 11 may be the bottom surface, and the inner cover plate 30 and the outer cover plate 40 may be the front surface (not shown). In other words, the front surface (one surface) of the box body 5 may be opened.

[0052] Furthermore, although the packaging box 1 according to the present embodiment is formed from a double-sided corrugated cardboard sheet made of paper, the present invention is not limited thereto, and may be formed from a single-sided corrugated cardboard sheet, a double-sided corrugated cardboard sheet, thick paper, a resin plate (sheet), etc. Furthermore, the dimensions (width, depth, height) and shape of each part of the packaging box 1, the thickness of the corrugated cardboard sheet, the extension direction of the core 9A, etc. may be freely changed.

[0053] The above embodiment is merely an example of the packaging box of the present invention, and the technical scope of the present invention is not limited to the above embodiment. The present invention may be modified, substituted, or altered in various ways without departing from the spirit of the technical idea, and the claims include all embodiments that may be included within the scope of the technical idea. [Explanation of symbols]

[0054] 1 packaging box 5 Box body 10 Bottom wall (foundation) 11 First side wall 12 Second side wall 14 Protection Department 15 Lid 20 Second outer wall 21 Second inner wall 26 Groove retaining piece 30 Inner cover plate 31 Partition 33 Insertion groove 41 Insertion plate 90 Goods S1 interior space

Claims

1. A box body (5) having one side open by alternately arranging a pair of first side walls (11) and a pair of second side walls (12) on the periphery of a base part (10); A protective portion (14) connected to one of the ends of the pair of first side walls and disposed in the internal space (S1) of the box body; a lid portion (15) connected to the other end of the pair of first side walls and closing the one surface of the box body, The protective portion includes a pair of partition plates (31) disposed between an article (90) accommodated in the internal space and the pair of second side walls, The pair of partition plates face each other with a pair of insertion grooves (33) sandwiched between the pair of partition plates and the inner surfaces of the pair of second side walls, The packaging box is characterized in that the lid portion includes a pair of insertion plates (41) that are inserted into a pair of the insertion grooves when closing the one side of the box body.

2. The packaging box according to claim 1, characterized in that one of the second side wall and the partition plate is provided with a groove retaining piece (26) that protrudes toward the other of the second side wall and the partition plate and contacts the other of the second side wall and the partition plate.

3. The second side wall is A second outer wall (20) connected to the edge of the base portion; A second inner wall (21) is connected to the tip of the second outer wall and is folded inward to face the second outer wall, The packaging box according to claim 2, characterized in that the groove retaining piece is connected to at least one of both side edges of the second inner wall, and is folded so as to protrude toward the internal space while interfering with the first side wall in the process of folding the second inner wall inward.

4. 4. The packaging box according to claim 1, wherein the protective portion includes an inner cover plate (30) extending from an end of one of the pair of first side walls toward the other of the pair of first side walls and spanning between the pair of partition plates to close a portion of the one surface of the box body.

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