JP3334017B2 - Cushioning material for packaging - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cushioning material for packing interposed between an upper wall and a lower wall of a container and an upper surface and a lower surface of a packaged object in a packaging container, and a corner of the container in the packaging container. The present invention relates to a cushioning material for packaging interposed between a portion and a ridgeline portion of an article to be packaged.

[0002]

2. Description of the Related Art For example, as a packaging cushioning material interposed between a corner of a container and a ridgeline of an article to be packaged in a packaging container, the applicant of the present invention has a structure as shown in FIG. (See Japanese Patent Application Laid-Open No. 4-294763). The cushioning material for packaging is composed of a tubular body (50) having a substantially L-shaped cross section formed entirely of paper or a composite material mainly composed of paper, and the tubular body (50) is formed of a container (C). A first component part (51) having a substantially L-shaped cross section extending across two walls sandwiching the entering corner, and the first component part (51) is disposed at a distance from the packaged object (S ), A second component portion (52) having a substantially L-shaped cross section extending across two surfaces sandwiching the ridge line portion, and two transverse portions connecting side edges of both component portions (51) and (52). The arcuate connecting portions (53) and (54) are formed in the vertical wall portion (51A) and the horizontal wall portion (51B) of the first component portion (51). As a result, the ribs (55) and (56) are formed over the entire length.

When such a packaging cushioning material is used, a vertical downward force as shown by an arrow in FIG. 7 acts on the packaged object (S) and an impact force is applied to the cylindrical body (50). , Tubular body (50)
Are deformed, and the impact force is reduced by the deformation resistance. At this time, the horizontal wall portion (52B) of the second component (52) is
It abuts against the rib (56) of the horizontal wall portion (51B) of the component portion (51) and is held in this state. As a result, the connection part (53) (54)
Of the cushioning material is prevented, and the function of the cushioning material is maintained for a long time.

[0004]

However, it has been found that the conventional cushioning material shown in FIG. 7 has the following problems. That is, when a large impact force is applied to the cushioning material as in the case where the weight of the packaged object (S) is large or a large vertical load is applied to the packaged object (S), first, the second component (52) ) Is the first component part.
The horizontal wall portion (51B) of the first component (51) is deformed so that the rib (56) of the horizontal wall portion (51B) of the first component portion (51) abuts on the rib (56) in the horizontal direction. As shown by a two-dot chain line in FIG. 7, the horizontal portion of the tubular body (50) is flattened and loses its function as a cushioning material.

An object of the present invention is to provide a cushioning material for packaging which has solved the above-mentioned problems.

[0006]

According to a first aspect of the present invention, there is provided a packaging cushioning material interposed between an upper wall and a lower wall of a container and an upper surface and a lower surface of an object to be packaged in a packaging container. Wherein the whole is formed of a tubular body having a substantially horizontal rectangular cross section formed of paper or a composite material mainly composed of paper, wherein the tubular body is spaced apart from a first component part along the container, and the first component part. A second component disposed along and along the item to be packaged;
A connecting portion for connecting the side edges of the two component portions to each other, and by inwardly recessing a middle portion of the width of the first component portion, an inwardly projecting rib is formed on the first component member over the entire length. In addition, an inwardly concave recess is formed on the outer surface of the first component member over the entire length, and a band-shaped reinforcing sheet is arranged along the outer surface of the first component portion and straddling the recess. It is bonded to the outer surface of the first component on both sides of the place.

A packaging cushioning material according to a second aspect of the present invention is a packaging cushioning material interposed between a corner of a container and a ridgeline of an article to be packaged in a packaging container, and is entirely paper or paper. And a cylindrical body having a substantially L-shaped cross section formed of a composite material mainly composed of: a cylindrical body having a substantially L-shaped cross section extending across two walls sandwiching a corner into which the container enters. A second component having a substantially L-shaped cross-section, which is arranged at an interval from the first component and extends across two surfaces sandwiching the ridge of the packaged object;
A component part and a connecting part for connecting the side edges of the two component parts to each other, and by inwardly indenting the middle part of the width of the lateral wall part of the first component part, the lateral wall part protrudes inward. Ribs are formed over the entire length, and inwardly concave recesses are formed on the outer surface of the lateral wall portion over the entire length, and the belt-like reinforcement is formed along the outer surface of the lateral wall portion of the first component and across the recess. A sheet is disposed, and a reinforcing sheet is adhered to the outer surface of the side wall portion on both sides of the recess.

A packaging cushioning material according to a third aspect of the present invention is a packaging cushioning material interposed between a corner of a container and a ridgeline of an article to be packaged in a packaging container, and is entirely paper or paper. And a cylindrical body having a substantially L-shaped cross section formed of a composite material mainly composed of: a cylindrical body having a substantially L-shaped cross section extending across two walls sandwiching a corner into which the container enters. A second component having a substantially L-shaped cross-section, which is arranged at an interval from the first component and extends across two surfaces sandwiching the ridge of the packaged object;
The first part comprises a connecting part for connecting the side edges of the two parts, and by indenting an intermediate part of the width of the side wall part of the first part inward, an inner surface of the side wall part is formed. A rib protruding to the entire length is formed over the entire length, and an inwardly concave recess is formed on the outer surface of the lateral wall portion over the entire length. A reinforcing sheet is arranged along the facing wall portion so as to be along the facing wall portion, and the reinforcing sheet is
The component is bonded to a portion on the tip side of the recess on the outer surface of the horizontal wall portion and to the outer surface of the vertical wall portion, respectively.

In the above three cushioning materials for packaging,
As the reinforcing sheet, for example, a sheet made of paper having a thickness of about 0.8 to 1 mm is preferably used.

[0010]

According to the cushioning material for packaging of the first invention, when a large vertical load is applied to the cushioning material due to a heavy weight of the packaged object or a large vertical load applied to the packaged object. First, the second component abuts against the rib of the first component, but a strip-shaped reinforcing sheet is arranged along the outer surface of the first component and straddling the recess, and the reinforcing sheet is provided on both sides of the recess. Since the first component is bonded to the outer surface of the first component, the deformation of the first component that prevents the ribs from opening in the horizontal direction is prevented by the function of the reinforcing sheet.

According to the packaging cushioning material of the second invention, when a large vertical load is applied to the cushioning material due to a large weight of the packaged material or a large vertical load applied to the packaged material. First, the horizontal wall portion of the second component abuts against the rib of the horizontal wall portion of the first component, but the strip-shaped reinforcing sheet is arranged along the outer surface of the horizontal wall portion of the first component and straddling the recess. Since the reinforcing sheet is bonded to the outer surface of the horizontal wall portion on both sides of the recess, the deformation of the horizontal wall portion of the first component member such that the rib is opened in the horizontal direction by the function of the reinforcing sheet is prevented.

According to the packaging cushioning material of the third invention, when a large vertical load is applied to the cushioning material due to a large weight of the packaged material or a large vertical load applied to the packaged material. First, the lateral wall portion of the second component abuts on the rib, but the reinforcing sheet is disposed along the vertical wall portion from the tip side of the recess of the horizontal wall portion on the outer surface of the first component portion. Since the reinforcing sheet is bonded to the portion on the tip side of the recess on the outer surface of the horizontal wall portion of the first component and to the outer surface of the vertical wall portion, the rib is opened in the horizontal direction by the action of the reinforcing sheet. The deformation of the lateral wall portion of the first component is prevented.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. In the following description, the upper and lower sides and left and right sides of each drawing are referred to as upper and lower sides and left and right sides. It is to be noted that the same components and the same portions are denoted by the same reference symbols throughout the drawings, and description thereof will be omitted.

Embodiment 1 This embodiment is shown in FIG. 1 and includes a packaging container (C).
A packing cushioning material interposed between the upper and lower walls of the container (C) and the upper and lower surfaces of the packaged object (S). FIG. 1 shows a state in which the cushioning material for packaging is interposed between the lower wall of the container (C) and the lower surface of the article to be packaged (S).

In FIG. 1, the cushioning material for packaging is formed of a tubular body (1) having a substantially horizontal rectangular cross section and formed entirely of paper or a composite material mainly composed of paper. As the paper, for example, recycled paper is used. As the composite material, for example, a material obtained by laminating a plastic film, a nonwoven fabric, a foam sheet, or the like on recycled paper, or a material obtained by applying a resin coating to the surface of recycled paper is used.

[0016] The cylindrical body (1) is provided along the first wall along the lower wall of the container (C).
A component part (2), a second component part (3) in the form of a horizontal plate arranged at a distance from the first component part (2) and along the lower surface of the article to be packaged (S); ) And (3) are formed of two arc-shaped cross-section connecting portions (4) and (5) for connecting the left and right side edges of each other.

An inwardly projecting rib (6) is formed over the entire length of the first component (2) of the tubular body (1) by indenting an intermediate portion of the width inward. Also ribs
Due to the formation of (6), a recess (7) which is recessed inward is formed on the outer surface of the first component (2) over the entire length. A strip-shaped reinforcing sheet (8) is disposed across the recess (7) along the outer surface of the first component (2). Reinforcement sheet
(8) is bonded to the outer surface of the first component (2) on both sides of the recess (7).

When a vertical downward force as shown by an arrow in FIG. 1 acts on the packaged object (S) to apply an impact force to the cylindrical body (1), the cylindrical body (1) As shown by a two-dot chain line, the impact force is reduced by the deformation resistance. That is, the connecting portions (4) and (5) are deformed so as to close, and the second component (3) comes into contact with the rib (6) of the first component (2). And since the cross-sectional shape of both connecting parts (4) (5) is an arc shape, even if such deformation is repeated, cracks and cracks are less likely to occur on the outer surfaces of both connecting parts (4) (5). , Restorability is not easily impaired. In addition, the action of the rib prevents the two connecting portions (4) and (5) from being crushed.

Even if the vertical impact force exerted on the cylindrical body (1) is further increased, the first component (2) in which the rib (6) is opened in the horizontal direction by the action of the reinforcing sheet (8). As a result, the connecting portions (4) and (5) are prevented from crushing and the tubular body (1) is prevented from crushing flat. Therefore,
The cushioning function of the packaging cushioning material is maintained for a long time.

Although not shown, the packaging cushioning material of the first embodiment is interposed between the upper wall of the container (C) and the upper surface of the article to be packaged (S) in the packaging container (C). Even when a vertical impact force acts on the cushioning material for packaging, the impact force is reduced in the same manner as described above, and the cushioning function is maintained for a long time.

Example 2 This example is the one shown in FIG.
This is a cushioning material for packaging that is interposed between the corner of the container (C) and the ridge of the article to be packaged (S). FIG. 2 shows a state in which the cushioning material for packing is interposed between the lower left entry corner of the container (C) and the lower left ridge line of the article to be packaged (S).

In FIG. 2, the cushioning material for packaging is entirely
Cross section substantially L formed of paper or a composite material mainly composed of paper
It consists of a cylindrical body (10). As the paper and the composite material, those similar to those in the first embodiment are used.

The cylindrical body (10) includes a first component (12) having a substantially L-shaped cross section extending along two horizontal and vertical walls sandwiching a corner of the container (C). A second component part (13) having a substantially L-shaped cross section, which is arranged at a distance from the component part (12) and extends across two horizontal and vertical surfaces sandwiching the ridge of the package (S); And two arc-shaped cross-section connecting portions (14) (15) connecting the upper edges and the right edges of both components (12) (13).

The vertical wall portion (12A) and the horizontal wall portion (12B) of the first component portion (12) of the tubular body (10) are formed by indenting the middle portions of the respective widths inwardly, thereby forming the inner portion. Ribs (16) and (17) projecting toward the entire length are formed. The ribs (16) and (17) are formed so that the vertical wall portion (12A) and the horizontal wall portion (12B) of the first component (12) are formed.
The recesses (18) and (19), which are respectively recessed inward, are formed over the entire length of the outer surface. The strip-shaped reinforcing sheets (21, 22) straddle the recesses (18, 19) along the outer surfaces of the vertical wall portion (12A) and the horizontal wall portion (12B) of the first component portion (12), respectively. It is arranged in. Both reinforcement sheets (21) and (22)
(18) On both sides of (19), each vertical wall part (12A)
And the outer surface of the side wall portion (12B).

When a vertical downward force as shown by an arrow in FIG. 2 acts on the packaged object (S) to apply a vertical impact force to the cylindrical body (10), the cylindrical body (10) is It is deformed as shown by a two-dot chain line in the figure, and the impact force is reduced by this deformation resistance.
That is, the arc-shaped connecting portions (14) (15) of both cross sections act like hinges, the upper connecting portion (14) is deformed to open, and the right connecting portion (15) is deformed to close. I do. Moreover, the horizontal wall portion (13B) of the second component (13) abuts against the rib (17) of the horizontal wall portion (12B) of the first component (12).
And since the cross-sectional shape of both connecting parts (14) (15) is an arc shape, even if the degree of the above deformation is large or such deformation is repeated, the outer surface of the connecting parts (14) (15) Cracks and cracks are less likely to occur, and the resilience is less likely to be impaired. Moreover, the ribs (1) of the side wall portion (12B) of the first component portion (12)
7) prevents the right connecting portion (15) from being collapsed.

Even if the vertical impact force applied to the cylindrical body (10) is further increased, the first component (12) in which the rib (17) is opened horizontally by the action of the reinforcing sheet (22). The horizontal wall portion (12B) is prevented from being deformed, and as a result, the connecting portion (15) is prevented from collapsing and the horizontal portion of the tubular body (10) is prevented from collapsing flat. Therefore, the cushioning function of the cushioning material for packaging is maintained for a long time.

On the other hand, when a horizontal leftward force acts on the packaged object (S) and a horizontal impact force is applied to the cylindrical body (10), the same applies to the case where the vertical downward force acts. In addition, the impact force is reduced. In addition, the cushioning function of the cushioning material for packaging is maintained for a long time.

Although not shown, the cushioning material for packaging of the second embodiment is interposed between the other entry corner of the packaging container (C) and the other ridge line of the article to be packaged (S). When a vertical and horizontal impact force acts on the packaging cushioning material, the impact force is reduced in the same manner as described above, and the cushioning function is maintained for a long time.

Example 3 This example is shown in FIG. 3 and shows a packaging container (C).
This is a cushioning material for packaging that is interposed between the corner of the container (C) and the ridge of the article to be packaged (S). FIG. 3 shows a state in which the cushioning material for packaging is interposed between the lower left corner of the container (C) and the lower left ridge of the article to be packaged (S).

In FIG. 3, the second component of the tubular body (10)
(13) Vertical wall part (13A) and horizontal wall part (13B)
In addition, each projecting inward, and the tip is the first component (1
The cross-section arc-shaped ribs (2) contacting the cross-section trapezoidal ribs (16) and (17) of the vertical wall portion (12A) and the horizontal wall portion (12B) of (2)
3) (24) is formed over the entire length.

According to the cushioning member made of the cylindrical body (10),
In the operation of the second embodiment, the effect of preventing the connection portions (14) and (15) from being crushed is further improved. Therefore, it can withstand a larger impact force.

Although not shown, the cushioning material for packaging of the third embodiment is also interposed between the other entry corner of the packaging container (C) and the other ridge of the article to be packaged (S). Even when impacts in the vertical and horizontal directions act on the cushioning material for packaging, the impacts are reduced in the same manner as described above, and the cushioning function is maintained for a long time.

Example 4 This example is the one shown in FIG.
This is a cushioning material for packaging that is interposed between the corner of the container (C) and the ridge of the article to be packaged (S). FIG. 4 shows a state in which the cushioning material for packaging is interposed between the lower left corner of the container (C) and the lower left ridge of the article to be packaged (S).

In FIG. 4, the horizontal wall portions of the first and second components (26) and (27) of the cylindrical body (25) formed of paper or a composite material mainly composed of paper as in the first embodiment. (26B) and (27B) are each wider than the vertical wall portions (26A) and (27A). A plurality of inwardly projecting cross-section trapezoidal ribs (17) are formed in the transverse wall portion (26B) of the first component portion (26) by indenting the middle portion of the width inward at a plurality of locations. It is formed over the entire length. Further, by forming the ribs (17), a plurality of indents (19) which are inwardly recessed are formed on the outer surface of the horizontal wall portion (26B) of the first component portion (26) over the entire length. . Side wall portion (26B) of the first component (26)
The strip-shaped reinforcing sheet (28) is arranged across all the recesses (19) so as to extend along the outer surface of the flat sheet. The reinforcing sheet (28) is bonded to the outer surfaces of the left and right side edges of the horizontal wall portion (26B).

The vertical wall portion (2) of the first component portion (26)
6A), by indenting the middle part of the width inward,
An inwardly projecting cross-sectionally arcuate rib (29) is formed over the entire length. The tip of the rib (29) is in contact with the vertical wall portion (27A) of the second component (27).

The function and effect when a vertical impact force is applied to the cushioning member made of the cylindrical body (25) are almost the same as those of the second embodiment.

Although not shown, the packaging cushioning material of the fourth embodiment is also interposed between the other entry corner of the packaging container (C) and the other ridge of the article to be packaged (S).

Example 5 This example is the one shown in FIG.
This is a cushioning material for packaging that is interposed between the corner of the container (C) and the ridge of the article to be packaged (S). FIG. 5 shows a state in which the cushioning material for packing is interposed between the lower left entry corner of the container (C) and the lower left ridgeline of the article to be packaged (S).

In FIG. 5, the right side edge of the horizontal wall portion (13B) of the second component portion (13) of the cylindrical body (30) formed of paper or a composite material mainly composed of paper as in the first embodiment. The first component (1) is attached to the upper edge of the vertical wall portion (13A).
The inclined portions (31) and (32) are formed on the side of the horizontal wall portion (12B) and the vertical wall portion (12A) of 2). Inclined part (31)
The tip of (32) is continuous with the arc-shaped cross-section connecting portions (15) (14).

The vertical wall portion (1) is located on the outer surface of the first component portion (12) from the tip side of the recess (19) of the horizontal wall portion (12B).
A reinforcing sheet (33) is arranged along the front side of the recess (18) of 2A). The reinforcing sheet (33) is provided at a portion on the tip side of the recess (19) on the outer surface of the horizontal wall portion (12B) and a portion on the tip side of the recess (18) on the outer surface of the vertical wall portion (12A). Glued.

The operation and effect when a vertical impact force is applied to the cushioning member made of the cylindrical body (30) are almost the same as those of the second embodiment.

Although not shown, the cushioning material for packaging of the fifth embodiment is also interposed between the other entry corner of the packaging container (C) and the other ridge line of the article to be packaged (S).

In the fifth embodiment, the reinforcing sheet (33)
May be bonded to the outer surface of the base end of the horizontal wall portion (12B) and the outer surface of the lower end of the vertical wall portion (12A).

Example 6 This example is the one shown in FIG.
This is a cushioning material for packaging that is interposed between the corner of the container (C) and the ridge of the article to be packaged (S). FIG. 6 shows a state in which the cushioning material for packing is interposed between the lower left corner of the container (C) and the lower left ridge of the article to be packaged (S).

In FIG. 6, a lateral wall portion (41B) of a first component portion (41) of a tubular body (40) formed of paper or a composite material mainly composed of paper similar to the first embodiment, 2 components (42)
The distance between the horizontal wall (42B) and the vertical wall (41A)
(42A) It is larger than the interval between each other. Also, the connecting portion (43) connecting the right edge portions of the horizontal wall portions (41B) and (42B) of the two component portions (41) and (42) has a linear cross section,
The connecting portion between the upper and lower edges of the connecting portion (43) and the horizontal wall portions (41B) (42B) of the component portions (41) and (42) is formed in a round shape.

The vertical wall portion (42A) of the second component (42)
Furthermore, by indenting the lower end portion inward, an inwardly protruding arc-shaped cross-section rib (44) is formed over the entire length. The distal end of the rib (44) is in contact with the trapezoidal rib (16) in cross section of the vertical wall portion (41B) of the first component (41).

The vertical wall portion (4) is located on the outer surface of the first component portion (41) from the tip side of the recess (19) of the horizontal wall portion (41B).
The reinforcing sheet (33) is arranged along the front side of the recess (18) of 1A). The reinforcing sheet (33) is provided at a portion on the tip side of the recess (19) on the outer surface of the horizontal wall portion (41B) and a portion on the tip side of the recess (18) on the outer surface of the vertical wall portion (41A). Glued.

The function and effect when a vertical impact force is applied to the cushioning member made of the cylindrical body (40) are almost the same as those of the second embodiment.

Although not shown, the cushioning material for packaging of the sixth embodiment is also interposed between the other entry corner of the packaging container (C) and the other ridge line of the article to be packaged (S).

In the sixth embodiment, the reinforcing sheet (33)
May be bonded to the outer surface of the base end portion of the horizontal wall portion (41B) and the outer surface of the lower end portion of the vertical wall portion (41A).

[0051]

According to the cushioning material for packaging of the present invention, as described above, the first component is prevented from being deformed so that the ribs are opened in the horizontal direction by the action of the reinforcing sheet.
Even when the impact force applied to the cushioning material is large, the cushioning function is maintained for a long time.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing Embodiment 1 of the present invention.

FIG. 2 is a cross-sectional view showing Embodiment 2 of the present invention.

FIG. 3 is a transverse sectional view showing a third embodiment of the present invention.

FIG. 4 is a transverse sectional view showing a fourth embodiment of the present invention.

FIG. 5 is a transverse sectional view showing Embodiment 5 of the present invention.

FIG. 6 is a transverse sectional view showing a sixth embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 (1) Cylindrical body (2) First component (3) Second component (6) Rib (7) Depression (8) Reinforcement sheet (10) Cylindrical body (12) First component (12A) Vertical wall part (12B) Horizontal wall part (13) Second component part (17) Rib (19) Depression (22) Reinforcement sheet (25) Cylindrical body (26) First component part (26B) Horizontal wall part (27) Second component part (28) Reinforcement sheet (30) Tubular body (33) Reinforcement sheet (40) Tubular body (41) First component part (41A) Vertical wall part (41B) Horizontal wall part ( 42) Second component

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B65D 81/113 B65D 59/00

Claims (3)

(57) [Claims] 1. A packaging cushioning material interposed between an upper wall and a lower wall of a container and an upper surface and a lower surface of an object to be packaged in a packaging container, wherein the whole is paper or a composite material mainly composed of paper. , A first component part along the container, and a second component part arranged at a distance from the first component part and along the article to be packaged. And a connecting portion for connecting the side edges of both components, and by indenting the middle portion of the width of the first component inward, the rib protruding inward in the first component over the entire length. While being formed, an inwardly concave recess is formed on the outer surface of the first component over the entire length, and a belt-like reinforcing sheet is arranged along the outer surface of the first component and straddling the recess. Glued to the outer surface of the first component on both sides of the recess Cushioning material that. 2. A packaging cushioning material interposed between a corner of a container and a ridge of a packaged object in a packaging container, the whole being formed of paper or a composite material mainly composed of paper. A first component part having a substantially L-shaped cross section extending across two walls sandwiching the corner of the container. A second component having a substantially L-shaped cross-section, which is disposed at an interval from the portion and extends across two surfaces sandwiching the ridge portion of the packaged object, and a connection connecting side edges of both components; The first wall portion is formed by indenting an intermediate portion of the width of the horizontal wall portion of the first component portion inward, whereby an inwardly projecting rib is formed in the horizontal wall portion over the entire length, and the outer surface of the horizontal wall portion An inwardly recessed portion is formed over the entire length and extends along the outer surface of the lateral wall portion of the first component. And the strip-shaped reinforcing sheet so as to straddle the recess is disposed, the reinforcing sheet, the cushioning material is bonded to the lateral wall portion outer surface on both sides of the recess. 3. A packaging cushioning material interposed between a corner of a container and a ridgeline of an object to be packaged in a packaging container, the whole being formed of paper or a composite material mainly composed of paper. A first component part having a substantially L-shaped cross section extending across two walls sandwiching the corner of the container. A second component having a substantially L-shaped cross-section, which is disposed at an interval from the portion and extends across two surfaces sandwiching the ridge portion of the packaged object, and a connection connecting side edges of both components; The first wall portion is formed by indenting an intermediate portion of the width of the horizontal wall portion of the first component portion inward, whereby an inwardly projecting rib is formed in the horizontal wall portion over the entire length, and the outer surface of the horizontal wall portion An inwardly recessed portion is formed over the entire length, and a lateral wall portion on an outer surface of the first component portion. A reinforcing sheet is disposed along the vertical wall portion from the distal end side of the concave portion, and the reinforcing sheet includes a portion on the distal end side relative to the concave portion on the outer surface of the horizontal wall portion of the first component portion and the vertical wall. A cushioning material for packaging adhered to the outer surface of each part.