Tray and blank sheet

Abstract

To provide a tray capable of suppressing outward expansion of a wall part and facilitating stacking of a plurality of trays.SOLUTION: The tray 1 includes an outer wall 20, a side wall 40, an inner wall 30 folded back to the inner surface side of the outer wall 20, and a folding plate 50 sandwiched between the outer wall 20 and the inner wall 30 in a folded state. The folding plate 50 includes a first plate portion 51 connected to the outer panel 20 and a second plate portion 52 connected to the sidewall 40, and the first plate portion 51 and the second plate portion 52 are connected via an intermediate folding line L10. An angle between the side edge L3 of the outer panel 20 and the intermediate folding line L10 and an angle between the side edge L2 of the sidewall 40 and the intermediate folding line L10 are formed at 45 °, and an angle θ 1 between the lower edge L1 of the sidewall 40 and the side edge L2 of the sidewall 40 is formed smaller than 90 °.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a tray and a blank sheet. [Background technology]

[0002] Some cardboard trays have a bottom plate, front and rear outer walls, an inner wall folded back on the inside of the outer wall, left and right side walls, and folding plates connected to the outer and side walls, with the folding plates sandwiched between the outer and inner walls in a folded state (see, for example, Patent Document 1). The folding plate of the conventional tray is formed in a rectangular shape, and a middle fold line is formed on the diagonal of the folding plate from the intersection of the lower end of the side edge of the outer wall and the lower end of the side edge of the side wall. The folding plate is then folded in half at the middle fold line. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-115101 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional tray 100 described above, as shown in Fig. 8, the angle between the bottom edge L1 of the side wall 40 and the side edge L2 of the side wall 40 is 90 degrees. In this configuration, the outer wall 20 may be pushed outward and tilted by the restoring force of the folded folding plate 50. If the outer wall 20 is tilted outward, it becomes difficult to stack multiple trays 100.

[0005] The present invention aims to solve the above-mentioned problems and to provide a tray that can prevent the walls from spreading outward, making it easier to stack multiple trays, and a blank sheet for forming the tray. [Means for solving the problem]

[0006] To solve the above problem, a first invention provides a tray comprising a bottom plate, front and rear outer walls extending from the front and rear edges of the bottom plate, an inner wall connected to the upper edge of the outer wall and folded back toward the inner surface of the outer wall, and left and right side walls extending from the left and right edges of the bottom plate. The tray also includes a folding plate connected to the adjacent outer wall and side wall and sandwiched in a folded state between the outer wall and the inner wall. The folding plate includes a first plate portion connected to the side edge of the outer wall and overlapping the inner surface of the outer wall, and a second plate portion connected to the side edge of the side wall and overlapping the inner surface of the first plate portion, the first plate portion and the second plate portion being connected via a middle fold line. The lower end of the middle fold line extends toward the intersection of the lower end of the side edge of the outer wall and the lower end of the side edge of the side wall. The angle between the side edge of the outer wall and the intermediate fold line and the angle between the side edge of the side wall and the intermediate fold line are formed at 45 degrees, and the angle between the lower edge of the side wall and the side edge of the side wall is formed at less than 90 degrees.

[0007] To solve the above problem, a second invention provides a blank sheet for forming a tray, the blank sheet comprising: a bottom plate; front and rear outer walls extending from the front and rear edges of the bottom plate; inner walls extending from the upper edges of the outer walls and folded back toward the inner surface of the outer walls; left and right side walls extending from the left and right edges of the bottom plate; and a folding plate extending from the adjacent outer wall to the side walls and sandwiched in a folded state between the outer wall and the inner wall. The folding plate comprises a first plate portion extending from the side edge of the outer wall and overlapping the inner surface of the outer wall, and a second plate portion extending from the side edge of the side wall and overlapping the inner surface of the first plate portion. The first plate portion and the second plate portion are connected via a middle fold line, and an end of the middle fold line extends toward an intersection of an end of the side edge of the outer wall and an end of the side edge of the side wall. The angle between the side edge of the outer wall and the intermediate fold line and the angle between the side edge of the side wall and the intermediate fold line are 45 degrees, and the angle between the edge of the side wall on the bottom plate side and the side edge of the side wall is less than 90 degrees.

[0008] In this invention, when the tray is assembled, the folding plates connected to the side edges of the side walls are tilted inward in the front-to-rear direction as they move from bottom to top, which prevents the outer walls from spreading outward even if the restoring force of the folded folding plates acts on the outer walls, allowing multiple trays to be stacked stably.

[0009] The angle between the lower edge of the side wall and the side edge of the side wall is preferably between 89 and 85 degrees, and more preferably between 88 and 87 degrees. Also, by setting the upper end of the side edge of the side wall relative to the lower end so that it extends inward in the front-to-rear direction by a length approximately twice the thickness of the folding plate, it is possible to effectively prevent the outer wall from tilting outward.

[0010] In the tray, the outer wall and the inner wall are connected via an intermediate plate, and a connecting hole is formed in the edge of the bottom plate. Also, it is preferable that a protrusion is formed on the upper edge of the folding plate, and the protrusion is inserted into an insertion hole formed in the intermediate plate so as to protrude from the upper surface of the intermediate plate.

[0011] In this configuration, when multiple trays are stacked, the upper and lower trays can be stacked stably by inserting the protrusions of the lower tray into the connecting holes of the upper tray. In this invention, since the outer wall and folding plates are unlikely to tilt outward, the protrusions of the folding plate of the lower tray can be reliably inserted into the connecting holes of the bottom plate of the upper tray.

[0012] In the tray, if the width of the protrusion in the left-right direction is smaller than the width of the insertion hole in the left-right direction, the protrusion can be easily inserted into the insertion hole.

[0013] In the tray described above, when an opening is formed at the lower end of the intermediate folding line, the folding plate can be folded neatly.

[0014] In the tray described above, it is preferable that the lower edge of the inner wall is smaller than the upper edge. Also, it is preferable that the maximum width of the inner wall in the left-right direction is smaller than the distance between the inner surfaces of the both side walls. In this way, when folding the inner wall back against the outer wall, it becomes easier to fit the inner wall between the both side walls, making it easier to assemble the tray using a box making machine or by hand.

[0015] If the tray is made of cardboard, the corrugations of the cardboard on the outer and inner walls can be configured to extend in the vertical direction, thereby increasing the strength of the outer and inner walls against loads from above.

[0016] When the tray is made of cardboard, the strength of the side walls against a load from above can be increased by configuring the corrugations of the cardboard of the side walls to extend in the vertical direction. [Effects of the Invention]

[0017] The tray of the present invention can prevent the outer walls from expanding outward, making it easier to stack multiple trays. Also, the blank sheet of the present invention can prevent the outer walls from expanding outward, making it easier to form stackable trays. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a perspective view of a packaging box according to an embodiment of the present invention, viewed from the upper front left. FIG. [Figure 2] 1 is a diagram showing a blank sheet for a packaging box according to an embodiment of the present invention; [Figure 3] FIG. 2 is a side view showing the left rear portion of the packaging box according to the embodiment of the present invention. [Figure 4] 4 is a cross-sectional view of the packaging box according to the embodiment of the present invention taken along line IV-IV in FIG. 1. FIG. [Figure 5] 10 is a partial perspective view showing a state in which a side wall is raised up relative to a bottom plate in a method for assembling a packaging box according to an embodiment of the present invention. FIG. [Figure 6]FIG. 10 is a partial perspective view showing a state in which the outer wall is raised relative to the bottom plate and the folding plate is folded in the method for assembling the packaging box according to the embodiment of the present invention. [Figure 7] 10A and 10B are diagrams showing a blank sheet for a packaging box according to another embodiment of the present invention. [Figure 8] FIG. 1 is a side view showing the left rear portion of a conventional packaging box. DETAILED DESCRIPTION OF THE INVENTION

[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the front, rear, left and right directions are set for the convenience of describing the tray of this embodiment, and do not limit the configuration or usage state of the tray.

[0020] 1, the tray 1 of this embodiment includes a bottom plate 10, front and rear outer walls 20, 20 extending from the bottom plate 10, an inner wall 30 folded back toward the inner side of the outer wall 20, and left and right side walls 40, 40 extending from the bottom plate 10. The tray 1 also includes four folding plates 50.

[0021] The tray 1 of this embodiment is formed so that its length in the left-right direction is greater than its length in the front-rear direction. That is, the distance between the left and right side walls 40, 40 is greater than the distance between the front and rear outer walls 20, 20.

[0022] The tray 1 is formed by mountain or valley folding a blank sheet S1 cut out from a cardboard sheet at each fold line, as shown in Fig. 2. The blank sheet S1 shown in Fig. 2 is arranged so that the inner side is visible. The fold lines of the blank sheet S1 are creases (pressed creases) formed by linearly pressing the surface of the blank sheet S1. Note that the creases may also be formed with intermittent notches. This makes it easier to fold the blank sheet S1 at the creases. Alternatively, the folded lines may be formed by forming half-cut slits that cut only the surface of the sheet or by forming intermittent linear slits that penetrate the sheet.

[0023] As shown in Fig. 1, the bottom plate 10 is formed in a rectangular shape. Two connecting holes 11, 11 are formed at the front end of the bottom plate 10 with a gap between them in the left-right direction. Two connecting holes 11, 11 are also formed at the rear end of the bottom plate 10 with a gap between them in the left-right direction. The width of the connecting holes 11 in the front-to-rear direction is formed to be at least twice the plate thickness of the blank sheet S1.

[0024] The left side wall 40 is connected to the left edge of the bottom plate 10 via a fold line. The right side wall 40 is connected to the right edge of the bottom plate 10 via a fold line. The left and right side walls 40, 40 extend upward from the left and right edges of the bottom plate 10. The left and right side walls 40, 40 are formed in the same rectangular shape (see Figure 2).

[0025] As shown in FIG. 3, the angle θ1 between the lower edge L1 of the side wall 40 and the side edge L2 of the side wall 40 is formed to be smaller than 90 degrees. The angle θ1 between the lower edge L1 of the side wall 40 and the side edge L2 of the side wall 40 is preferably between 89 and 85 degrees, and the angle θ1 is more preferably between 88 and 87 degrees.

[0026] As shown in Fig. 1, the front outer wall 20 is connected to the front edge of the bottom plate 10 via a fold line. The rear outer wall 20 is connected to the rear edge of the bottom plate 10 via a fold line (see Fig. 6). The front and rear outer walls 20 extend upward from the front and rear edges of the bottom plate 10. The front and rear outer walls 20 are formed in the same rectangular shape (see Fig. 2).

[0027] The inner wall 30 is connected to the upper edge of the outer wall 20 via two front and rear folding lines. The inner wall 30 is folded back onto the inner surface of the outer wall 20 and is overlapped on the inner surface of the outer wall 20. The front and rear inner walls 30, 30 have the same configuration. In this embodiment, the corrugations of the cardboard of the outer wall 20 and the inner wall 30 are configured to extend in the vertical direction (see FIG. 2).

[0028] The inner wall 30 has a rectangular upper portion and a trapezoidal lower portion, and the width of the lower portion of the inner wall 30 in the left-right direction decreases from top to bottom. The inner wall 30 is formed so that the width of the lower part in the left-right direction is smaller than the width of the upper part in the left-right direction (see FIG. 2), and the lower edge of the inner wall 30 is formed smaller than the upper edge. In this embodiment, the maximum width of the inner wall 30 in the left-right direction is smaller than the distance between the inner surfaces of the side walls 40, 40 (see FIG. 2).

[0029] The lower edge of the inner wall 30 is in contact with the upper surface of the bottom plate 10. As shown in Figure 2, lower connecting portions 32, 32 protrude from the lower edge of the inner wall 30 at a distance in the left-right direction. The lower connecting portions 32 are inserted into the connecting holes 11 of the bottom plate 10 from above (see Figure 3).

[0030] 1, the outer wall 20 and the inner wall 30 are connected via an intermediate plate 60. The intermediate plate 60 is a strip-shaped portion formed between two front and rear folding lines. Two insertion holes 61, 61 are formed in the intermediate plate 60 with a gap between them in the left-right direction. The insertion hole 61 is formed from the upper end of the outer wall 20 to the upper end of the inner wall 30 (see FIG. 2).

[0031] The folding plates 50 are connected to the adjacent outer wall 20 and side wall 40, and are sandwiched between the outer wall 20 and the inner wall 30 in a folded state. The folding plates 50 are formed in a substantially rectangular shape in the state of the blank sheet S1 shown in FIG. 2. A folding plate 50 is formed at each of the four corners of the blank sheet S1. The four folding plates 50 have the same configuration.

[0032] As shown in Figure 5, the folding plate 50 has a first plate portion 51 connected to the side edge portion L3 of the outer wall 20 and a second plate portion 52 connected to the side edge portion L2 of the side wall 40, and the first plate portion 51 and the second plate portion 52 are connected via an intermediate fold line L10 (see Figure 2).

[0033] 2, the lower end of the intermediate folded line L10 extends toward the intersection of the lower end of the side edge L3 of the outer wall 20 and the lower end of the side edge L2 of the side wall 40. That is, as shown in FIG. 5, the intermediate folded line L10 extends obliquely upward from the intersection of the lower end of the side edge L3 of the outer wall 20 and the lower end of the side edge L2 of the side wall 40.

[0034] 2, the angle θ2 between the side edge L3 of the outer wall 20 and the intermediate fold line L10 is 45 degrees. The angle θ2 between the side edge L2 of the side wall 40 and the intermediate fold line L10 is also 45 degrees. In this way, by aligning the angle θ2 between the side edge L3 of the outer wall 20 and the intermediate fold line L10 and the angle θ2 between the side edge L2 of the side wall 40 and the intermediate fold line L10 to 45 degrees, it becomes easier to fold the folding plate 50 at the intermediate fold line L10. A plurality of slits are formed at intervals on the inner side of the intermediate fold line L10, which makes it easier to fold the first plate portion 51 and the second plate portion 52 at the intermediate fold line L10 in a mountain fold when viewed from the inner side of the blank sheet S1 (see FIG. 6).

[0035] 5, when the folding plate 50 is in an open state, an opening 53 is formed at the lower end of the intermediate fold line L10. Also, a recess 54 is formed at the upper end of the intermediate fold line L10. In this way, when the folding plate 50 is opened, an opening 53 is formed at the corner sandwiched between the side edge L2 of the outer wall 20 and the side edge L3 of the side wall 40, and a recess 54 is formed at the diagonal corner of the corner on the opening 53 side.

[0036] A fold line is formed on the side edge portion L3 of the outer wall 20. In this manner, the first plate portion 51 is connected to the side edge portion L3 of the outer wall 20 via the fold line. As shown in FIG. 6 , the first plate portion 51 is folded back inward with respect to the outer wall 20 at the fold line of the side edge portion L3 of the outer wall 20, and is overlapped on the inner surface side of the outer wall 20.

[0037] As shown in Fig. 5, a fold line is formed on the side edge L2 of the side wall 40. In this manner, the second plate portion 52 is connected to the side edge L2 of the side wall 40 via the fold line. As shown in Fig. 6, the second plate portion 52 is bent inward with respect to the side wall 40 at the fold line of the side wall 40, and is overlapped on the inner surface side of the first plate portion 51.

[0038] The upper edge of the first plate portion 51 is formed so as to be disposed along the upper edge of the outer wall 20 when the first plate portion 51 is placed on the inner surface of the outer wall 20 . A protrusion 55 is formed on the upper edge of the first plate portion 51. As shown in Fig. 1 , the protrusion 55 is inserted into an insertion hole 61 formed in the intermediate plate 60 and protrudes from the upper surface of the intermediate plate 60. The width of the protrusion 55 in the left-right direction is smaller than the width of the insertion hole 61 in the left-right direction. When another tray 1 is stacked on the tray 1, the protrusion 55 is inserted from below into the connecting hole 11 formed in the bottom plate 10 of the other tray 1.

[0039] Next, a method for assembling the tray 1 of this embodiment will be described. First, starting from the state of the blank sheet S1 shown in FIG. 2, the left and right side walls 40, 40 are raised up relative to the bottom plate 10 as shown in FIG. Subsequently, as shown in FIG. 6, when the outer wall 20 is raised relative to the bottom plate 10, the folding plate 50 is folded between the outer wall 20 and the side wall 40 at the intermediate folding line L10. At this time, when the folding plate 50 is viewed from inside the tray 1, the first plate portion 51 is folded back in a valley fold relative to the outer wall 20, and the second plate portion 52 is folded in a valley fold relative to the side wall 40. In addition, the first plate portion 51 and the second plate portion 52 are folded in a mountain fold at the intermediate fold line L10.

[0040] Thereafter, as shown in FIG. 1, the inner wall 30 is folded back toward the inner surface of the outer wall 20, and the folding plate 50 is sandwiched between the outer wall 20 and the inner wall 30 (see FIG. 4). Furthermore, the lower connecting portions 32 of the inner wall 30 are inserted into the connecting holes 11 of the bottom plate 10 to fix the inner wall 30 to the bottom plate 10 (see FIG. 4), thereby completing the assembly work of the tray 1.

[0041] In the tray 1 described above, as shown in FIG. 3, the folding plates 50 connected to the side edge portions L2 of the side walls 40 are tilted inward in the front-to-rear direction as they move from bottom to top (see FIG. 4). This prevents the outer walls 20 from spreading outward in the front-to-rear direction even when the restoring force of the folded folding plates 50 acts on the outer walls 20. This makes it easier to stack multiple trays 1. The blank sheet S1 of this embodiment shown in FIG. 2 can be used to form the tray 1 described above.

[0042] 4, the upper end of the side edge L2 of the side wall 40 is set to extend inward in the front-to-rear direction relative to the lower end of the side edge L2 by a length approximately twice the thickness of the folding plate 50. In other words, the upper end of the side edge L2 of the side wall 40 is set to extend inward in the front-to-rear direction relative to the lower end of the side edge L2 by a length equal to the thickness of the folded folding plate 50. This effectively prevents the outer wall 20 from tilting outward.

[0043] 3, in the tray 1 of this embodiment, the outer wall 20 and the folding plate 50 are unlikely to tilt outward, so when stacking multiple trays 1, the protrusion 55 of the folding plate 50 of the lower tray 1 can be reliably inserted into the connecting hole 11 of the bottom plate 10 of the upper tray 1. This allows multiple trays 1 to be stacked stably.

[0044] In the tray 1 of this embodiment, as shown in FIG. 5, an opening 53 is formed at the lower end of the middle fold line L10 of the folding plate 50, so that the folding plate 50 can be folded neatly as shown in FIG. 6. In the tray 1 of this embodiment, as shown in Fig. 5, an opening 53 is formed at the lower end of the middle fold line L10 of the folding plate 50, and a recess 54 is formed at the upper end of the middle fold line L10. In this way, since the middle fold line L10 is short, as shown in Fig. 6, the restoring force when the folding plate 50 is folded is small.

[0045] In the tray 1 of this embodiment, the left-right width of the protrusion 55 of the folding plate 50 is formed smaller than the left-right width of the insertion hole 61 of the intermediate plate 60, making it easier to insert the protrusion 55 into the insertion hole 61 when folding the inner wall 30 back against the outer wall 20. Furthermore, in the tray 1 of this embodiment, the lower edge of the inner wall 30 is formed smaller than the upper edge, and the maximum width of the inner wall 30 in the left-right direction is formed smaller than the distance between the inner surfaces of the both side walls 40, 40. This makes it easier for the inner wall 30 to fit between the both side walls 40, 40 when folded back relative to the outer wall 20. In this way, the tray 1 of this embodiment can be easily assembled using a box making machine or by hand.

[0046] In the tray 1 of this embodiment, the corrugations of the cardboard of the outer wall 20 and the inner wall 30 extend in the vertical direction, so that the strength of the outer wall 20 and the inner wall 30 against a load from above is high.

[0047] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and can be modified as appropriate within the scope of the invention. In the tray 1 of this embodiment, as shown in FIG. 1, the folding plate 50 has a protrusion 55 formed on the upper edge thereof, but the protrusion 55 of the folding plate 50 and the insertion hole 61 of the intermediate plate 60 do not have to be formed.

[0048] In the tray 1 of this embodiment, the corrugations of the cardboard of the outer wall 20 and the inner wall 30 extend in the vertical direction, but the corrugations of the cardboard of both side walls 40, 40 may also extend in the vertical direction. In this way, the strength of both side walls 40, 40 against loads from above can be increased.

[0049] In the tray 1 of this embodiment, the distance between the left and right side walls 40, 40 is larger than the distance between the front and rear outer walls 20, 20, but the size of the tray 1 in the front-rear and left-right directions is not limited. For example, as in the tray assembled from the blank sheet S2 shown in Figure 7, the distance between the front and rear outer walls 20, 20 may be larger than the distance between the left and right side walls 40, 40. Also, the distance between the front and rear outer walls 20, 20 and the distance between the left and right side walls 40, 40 may be formed to be the same size.

[0050] The fold line between the first plate portion 51 and the outer wall 20 shown in Figure 2 may be weakened. The weakening of the fold line is not limited to this, and for example, another fold line may be formed parallel to the fold line, or the fold line may be formed as a half-cut line. In this way, the first plate portion 51 becomes more easily bent relative to the outer wall 20, and therefore, when the folding plate 50 is folded, the first plate portion 51 is more easily tilted toward the inner surface of the outer wall 20.

[0051] Furthermore, if the thickness of the folding plate 50 is formed thinner than the thickness of the outer wall 20 and the side wall 40 by crushing, the restoring force when the folding plate 50 is folded can be reduced.

[0052] The tray 1 (see FIG. 1) and blank sheet S1 (see FIG. 2) of this embodiment are made of corrugated cardboard, but the tray and blank sheet may also be made of various known paperboards. [Explanation of symbols]

[0053] 1 tray 10 Bottom plate 11 Connection hole 20 Exterior Wall 30 Inner wall 32 Lower connection part 40 side wall 50 Folding board 51 First plate part 52 Second plate part 53 Opening 54 Recess 55 Protrusion 60 Intermediate plate 61 Insertion hole L1 Lower edge of side wall L2 Side edge of side wall L3 Side edge of exterior wall L10 Intermediate broken line S1 Blank Sheet S2 Blank sheet (other embodiments)

Claims

1. The bottom plate and Front and rear outer walls raised on the front and rear edges of the bottom plate; an inner wall connected to an upper edge portion of the outer wall and folded back toward the inner surface of the outer wall; Left and right side walls raised at left and right edge portions of the bottom plate; A folding plate is provided between the adjacent outer wall and the adjacent side wall and is sandwiched in a folded state between the outer wall and the inner wall, The folding plate is A first plate portion connected to a side edge portion of the outer wall and overlapped on an inner surface of the outer wall; a second plate portion connected to the side edge portion of the side wall and overlapping the inner surface of the first plate portion, The first plate portion and the second plate portion are connected via an intermediate fold line, a lower end of the intermediate folded line extends toward an intersection of a lower end of a side edge portion of the outer wall and a lower end of a side edge portion of the side wall, The angle between the side edge of the outer wall and the intermediate fold line and the angle between the side edge of the side wall and the intermediate fold line are formed at 45 degrees, A tray according to claim 1, wherein an angle between a lower edge of said side wall and a side edge of said side wall is formed to be smaller than 90 degrees.

2. 10. The tray of claim 1, The outer wall and the inner wall are connected via an intermediate plate, A connecting hole is formed in the edge of the bottom plate, A protrusion is formed on the upper edge of the folding plate, The tray is characterized in that the protrusion is inserted into an insertion hole formed in the intermediate plate and protrudes from the upper surface of the intermediate plate.

3. 3. The tray of claim 2, A tray characterized in that the width of the protrusion in the left-right direction is smaller than the width of the insertion hole in the left-right direction.

4. 10. The tray of claim 1, A tray characterized in that an opening is formed at the lower end of the intermediate fold line.

5. 10. The tray of claim 1, A tray characterized in that the lower edge of the inner wall is formed smaller than the upper edge.

6. 10. The tray of claim 1, A tray characterized in that the maximum width in the left-right direction of the inner wall is formed to be smaller than the distance between the inner surfaces of the both side walls.

7. The tray according to claim 1 is made of cardboard, A tray characterized in that the corrugations of the cardboard on the outer wall and the inner wall extend in the vertical direction.

8. The tray according to claim 1 is made of cardboard, A tray characterized in that the corrugations of the cardboard on the side walls extend in the vertical direction.

9. The bottom plate and Front and rear outer walls raised on the front and rear edges of the bottom plate; an inner wall connected to an upper edge portion of the outer wall and folded back toward the inner surface of the outer wall; Left and right side walls raised at left and right edge portions of the bottom plate; A blank sheet for forming a tray, comprising: a folding plate connected to the adjacent outer wall and side wall and sandwiched in a folded state between the outer wall and the inner wall, The folding plate is A first plate portion connected to a side edge portion of the outer wall and overlapped on an inner surface of the outer wall; a second plate portion connected to the side edge portion of the side wall and overlapping the inner surface of the first plate portion, The first plate portion and the second plate portion are connected via an intermediate fold line, an end of the intermediate folded line extends toward an intersection of an end of a side edge of the outer wall and an end of a side edge of the side wall; The angle between the side edge of the outer wall and the intermediate fold line and the angle between the side edge of the side wall and the intermediate fold line are formed at 45 degrees, A blank sheet, characterized in that an angle between an edge of the side wall on the bottom plate side and a side edge of the side wall is formed to be smaller than 90 degrees.

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