KR200383168Y1 - Cushion for a packaging box - Google Patents

Abstract

The packaging cushioning material includes a bottom plate, a first side plate connected to one end of the bottom plate, a first top plate connected to the first side plate, and a first cut through a boundary between the first middle side plate connected to the first top plate, the first top plate, and the first middle side plate. The second accommodating body comprising a first indentation part connected to the first top plate and bent inwardly at the boundary of the first incision, and a second side plate connected to the other end of the bottom plate, a second top plate connected to the second side plate, and a second top plate. A second incision connected to the second intermediate side plate, the second upper plate and the second intermediate side plate, and a second indentation portion which is bent inwardly in connection with the second upper plate at the boundary with the second incision; It has a receiving body. The first and second intermediate side plates include a marginal groove and a fixing protrusion, and the bottom plate includes a fixing piece and a fixing groove, and the first and second intermediate side plates are stably fastened onto the bottom plate. Therefore, the packaging cushioning material of the present invention has a stable structure, so that the packaged article can be stably received.

Description

Buffer material for packaging {CUSHION FOR A PACKAGING BOX}

The present invention relates to a shock absorber for packaging, and more particularly, to a shock absorber for packaging that can be compactly accommodated in a packaging box and can be safely protected from external shocks, and that can easily store items attached to the product. will be.

The packaging box may have a void space formed between the product and other products or between the product and the packaging box after loading the product. Such empty space may be generated by the shape of the package, and may be formed by the arrangement or size difference of the packages when storing two or more packages. As such, the products contained in the packaging box including the empty space may move freely in the box and may be damaged by external collision. In addition, when an external shock is transmitted, the shock is transmitted to the product without buffering, and damage and failure of the product may occur in the transportation process. In addition, since the packaging box may be recessed or crushed by an external force such as a load, the storage and loading of the box may be difficult.

As a conventional packaging cushioning material, styrofoam which is a foamable material is used. However, when a product is relatively small, such as a camcorder, a small audio device, a digital camera, etc., and contains many accessories other than a product, the conventional packaging buffer material takes up a lot of space unnecessarily. In addition, styrofoam has recently been reduced in use due to environmental pollution and difficult treatment after use.

Of course, in this regard, there is disclosed a packaging cushioning material using corrugated cardboard or the like, but such a packaging cushioning material has a weak supporting structure and strength and thus does not completely absorb external shocks. In addition, after removing the items from the box, it is difficult to store and handle them, and the space for accommodating all other accessories is limited, so the size of the box is inevitably increased to expand the storage space. . In addition, the packaging cushioning material using a conventional corrugated cardboard is often composed of a finished product assembled by assembly. In this case, when the assembly structure is complicated, the assembly process is difficult with the completed cushioning material, and the manufacturing cost increases because the manufacturing time is long because it has to go through cumbersome work such as attaching using an adhesive.

Accordingly, one object of the present invention for solving the above-described problems of the present invention is to provide a packing buffer material that is easy to assemble the developed buffer material, the structure of the packing buffer material is stable.

In addition, another object of the present invention is to provide a packaging cushioning material that can be manufactured by bending one corrugated raw material (raw material), which can effectively absorb external impact.

In addition, another object of the present invention is to provide a packaging cushioning material which can be easily and conveniently stored by the user for the product and accessories.

According to a preferred embodiment of the present invention for achieving the above object of the present invention, the packaging cushioning material has a bottom plate, a first receiving body and a second receiving body.

The first receiving body and the second receiving body are connected to both ends of the bottom plate via a bend line. The first receiving body includes a first side plate connected to one end of the bottom plate, a first top plate connected to the first side plate, a first incision through a boundary between the first middle plate connected to the first top plate, the first top plate, and the first middle side plate. The first cutout includes a first indent that is bent inwardly and connected to the first top plate at a boundary thereof. The second receiving body may include a second side plate connected to the other end of the bottom plate, a second top plate connected to the second side plate, a second intermediate side plate connected to the second top plate, a second upper plate and a second intermediate plate passing through a boundary. The second cutout includes a second indent that is bent inward and connected to the second top plate at a boundary thereof. The first and second intermediate side plates include clearance grooves provided at respective bottom ends, and fixing protrusions formed inwardly of the clearance grooves from the side bottom ends of the clearance grooves. In addition, the bottom plate includes a fixing piece formed therein and bent inward via a bending line adjacent to the fixing protrusion and a fixing groove formed in the fixing piece to accommodate the fixing protrusion. Accordingly, the fixing protrusions of the first and second intermediate side plates and the fixing grooves of the bottom plate are coupled to each other to stably maintain the structure of the packaging cushioning material, and the assembly process is convenient.

Since the cushioning material for packaging using a plate such as corrugated cardboard forms a three-dimensional structure by bending a plate such as corrugated cardboard, an effective shape can be produced using a minimum of materials. In addition, since the corrugated sheet allows deformation between the plate structures in a limited range, it can effectively cushion the impact from the outside. In addition, since corrugated paper is composed of a single plate, it is easy to store and manage before and after use, and can be stored in a bent form, so that the volume occupied in storage is small, there is no burden on use, and economic income through recycling, etc. You can get

However, the conventional packing cushions using corrugated cardboard have the above advantages, but it is difficult to store and handle the packing cushions due to the difficulty in assembling and disassembling the packing cushions, and there is not enough space to accommodate all the other accessories. In addition, when the assembly structure is a complicated structure, it is difficult to assemble with the completed cushioning material, and must be subjected to cumbersome work such as pasting using an adhesive.

On the contrary, the packaging cushioning material according to the present invention is formed such that the fixing protrusions of the first and second intermediate side plates and the fixing grooves of the bottom plate are engaged with each other. Accordingly, the receiving spaces are formed on the bottom plate by the first receiving body and the second receiving body, and the first intermediate side plate of the first receiving body and the second intermediate side plate of the second receiving body are bound on the bottom plate to form a structure of the packing cushion. Keep it stable. Therefore, even if the packaged object contained in the packaging cushioning material receives an external impact, the structure of the packaging cushioning material does not collapse and thus absorbs most of the impact, thereby being safely protected.

In addition, the bottom plate includes a fixing piece and a fixing groove which are bent inwardly through a bend line, and are automatically bound to the fixing protrusion and the fixing groove, respectively, when bent inward. Therefore, the assembled packaging cushioning material can be directly assembled without the need for an adhesive means such as an adhesive, so that the assembly is convenient. In addition, since the assembly of the cushioning material is completed by bending the fixing piece and the fixing groove into the bottom plate, the assembly is easy.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited or limited by the embodiments.

Example 1

1 is a perspective view for explaining a packaging buffer according to a first embodiment of the present invention, Figure 2 is an exploded view of the packaging buffer of Figure 1, Figure 3 is for explaining the process of assembling the packaging buffer of Figure 1 Partial perspective view.

1 to 3, the packaging cushioning material 100 includes a bottom plate 110, a first accommodating body 120, and a second accommodating body 130. The packing cushion according to the present invention may be designed to be suitable for accommodating a camcorder.

The bottom plate 110 forms a bottom surface of the cushioning material for packaging in a rectangular shape. The material of the bottom plate 110 is made of corrugated cardboard, has sufficient strength to maintain the structure of the packaging cushioning material, and can sufficiently cushion external shocks due to the characteristics of the corrugated cardboard, and is easy to bend according to the intention of the designer. In addition, since corrugated paper is a paper material, it is easy to purchase a material, and it is relatively light weight, and there is no burden to carry. In addition, it is easy to recycle due to the nature of the material of the paper is environmentally friendly, it can be easily cut and molded according to the intention of the designer. In addition, since it can be structurally molded through the bending of the corrugated cardboard has a number of advantages, such as to be able to carry it flat. Therefore, in the embodiment of the present invention, the bottom plate 110, the first receiving body 120 and the second receiving body 130 may be integrally formed of cardboard. Of course, according to another embodiment of the present invention can be manufactured in a thin plate shape, and if possible bending can be configured with a cushioning material for packaging according to the designer's intention in various materials other than corrugated cardboard.

The bottom plate 110 is provided with a fixing piece 112 and a fixing groove 114. The fixing piece 112 is positioned on the inner surface of the bottom plate 110, is formed in a shape corresponding to the clearance groove 142, and is bent toward the top of the bottom plate 110. Thus, the fixing piece 112 is engaged with the clearance groove 142 to fix the first intermediate side plate 126 and the second intermediate side plate 136. In addition, the bottom plate 110 is provided with a fixing groove 114 adjacent to the fixing piece 112 to accommodate the fixing protrusion 144. At this time, to provide the fixing piece 112 and the fixing groove 114 may be cut along the outer shape of the H-shape. Therefore, the fixing groove 114 and the fixing piece 112 may be formed adjacent to each other. However, in another embodiment of the present invention, the fixing piece and the fixing groove may be formed by cutting in various shapes according to the intention of the designer. In addition, an L-shaped outline cutting line is formed in the bottom plate 110, and is cut by the L-shaped outline cutting line to form structures of the first indentation 128 and the second indentation 138. Support 116 for supporting. In this case, the fixing groove 114 and the fixing piece 112 may be integrally formed with the support part 116. Thus, the support 116 supports the lower and side portions of the first indentation 128 and the second indentation 138. In this case, the fixing piece 112 and the fixing groove 114 may be formed at the same time on the support 116. However, in another embodiment of the present invention, the support may be formed with various incision lines according to the designer's intention.

The first accommodating body 120 has an inner space formed on the bottom plate 110 and is in close contact with the side of the camcorder to serve to cushion external shocks. Thus, it protects the camcorder from external shocks. However, in another embodiment of the present invention, it can be designed to buffer various devices according to the designer's intention.

The first receiving body 120 includes a first side plate 122, a first top plate 124, a first intermediate side plate 126, and a first indentation 128. The first side plate 122 is connected to one edge of the bottom plate 110 and is formed in an area corresponding to one side of the packaged object. Therefore, in the present invention, the width of the first receiving body 120 is formed to correspond to the side of the camcorder, but in another embodiment of the present invention may be formed to correspond to various devices according to the intention of the designer. The first top plate 124 is connected to one edge of the first side plate 122 via a bend line, and is bent in a direction covering the top of the bottom plate 110 along the bend line. The first middle side plate 126 is connected to one edge of the first top plate 124 via a bend line, and is bent to be perpendicular to the bottom plate 110. Therefore, the inner space is provided by the bottom plate 110, the first side plate 122, the first top plate 124, and the first intermediate side plate 126, which serves to cushion external shocks. The lower end of the first intermediate side plate 126 includes a clearance groove 142 and the fixing protrusion 144. The clearance groove 142 and the fixing protrusion 144 are formed by one cutting line. Therefore, the fixing protrusion 144 is formed inward of the clearance groove 142 from the side bottom end of the clearance groove 142. When the fixing piece 112 is bent vertically toward the top of the bottom plate 110, the clearance groove 142 includes the fixing piece 112 and the fixing groove 114 in the clearance groove 142 and the fixing protrusion 144. A cutting line of circular arcs is formed to guide the coupling.

In addition, the first indentation 128 may design the first cutout 128a passing through a boundary between the first upper plate 124 and the first intermediate side plate 126. In addition, the first indentation part 128 is connected to the first indentation side plate 128b and the first indentation side plate 128b which are connected to the first top plate 124 and are bent inward with the first incision part 128a as a boundary. And a first indented bottom plate 128c formed on the bottom plate 110 in parallel with the bottom plate 110. Accordingly, the first indentation 128 is bent toward the inner space of the first receiving body 120 to provide an accommodation space on the bottom plate 110. In addition, a circular incision line is formed in the first indentation bottom plate 128c to facilitate taking out the package from the accommodation space.

The second receiving body 130 includes a second side plate 132, a second top plate 134, a second intermediate side plate 136, a second indentation 138, and a third indentation 139. The second side plate 132 is connected to the other edge of the bottom plate 110 facing the first side plate 122, the width of which is formed to a width corresponding to one side of the package. The second top plate 134 is connected to one edge of the second side plate 132 via a bend line, and is bent in a direction covering the top of the bottom plate 110 along the bend line. The second intermediate side plate 136 is connected to one edge of the second upper plate 134 via a bend line and is bent to be perpendicular to the bottom plate 110. Accordingly, the second receiving body 120 is provided with an inner space provided by the bottom plate 110, the second side plate 132, the second top plate 134, and the second intermediate side plate 136. However, in another embodiment of the present invention, the size of the internal space may be variously set according to the intention of the designer. In addition, similar to the first intermediate side plate 126, the second intermediate side plate 136 includes a clearance groove 142 and a fixing protrusion 144 at the bottom of the second intermediate side plate 136.

In addition, the second indentation part 138 may have a second top plate bordering the second cutout 138a and the second cutout 138a via the boundary between the second top plate 134 and the second intermediate side plate 136. The second indentation side plate 138b connected to the 134 and bent inwardly and the second indentation bottom plate 138c connected to the second indentation side plate 138b and formed in parallel with the bottom plate 110 on the bottom plate 110 are formed. Include.

In addition, the third indentation 139 is a second cutout 139a and a third cutout 139a vertically passing through the boundary between the second side plate 132 and the second top plate 134. Third indentation bottom plate 139b connected to the top plate 134 and bent inwardly and a third indentation bottom plate 139c connected to the third indentation side plate 139b and formed on the bottom plate 110 in parallel with the bottom plate 110. It includes. Accordingly, the second indentation 138 has an accommodating space corresponding to the first indentation 128 of the first accommodating body 120, and accommodates the camcorder in the accommodating space.

Moreover, the 3rd indentation side plate 139b of the 3rd indentation part 139 is a position which contact | connects the 2nd indentation side plate 138b of the 2nd indentation part 138, The accommodation space is in the 2nd indentation part 138. It is formed in close contact with the receiving space formed by. The accommodation space defined by the third indentation 139 can accommodate the secondary substrate of the camcorder. However, in another embodiment of the present invention may further provide a plurality of indents according to the intention of the designer, it can accommodate a variety of additional substrates.

The third cutout 139a is designed such that the width of the cutout line of the second side plate 132 is narrower than the width of the cutout line corresponding to the inlet of the second top plate 134. Therefore, the secondary substrate accommodated in the third indentation portion 139 is fixed to the side of the packaged object by the narrowed portion of the incision line and is not separated out. Therefore, the package is stably received.

In addition, the second indentation bottom plate 138c is provided with a protrusion 136a protruding from the boundary with the second indentation side plate 138b toward the inner space to support the side of the L-shaped support part 116. Therefore, the support part 116 presses on the side of the second receiving body 130 such that the first receiving body 120 and the second receiving body 130 are in close contact with each other, and the position thereof is fixed by the protrusion 136a. Can be. Therefore, the packaging cushioning material can be easily assembled in the unfolded state. As shown in FIG. 3, the first receiving body 120 is bent toward the top of the bottom plate 110 at one corner of the bottom plate 110. At this time, when the support part 116 is bent toward the top of the bottom plate 110 (ⓑ), the fixing protrusion 144 of the first intermediate side plate 126 is inserted into the fixing groove 114 of the bottom plate 110, the bottom plate The fixing piece 112 of 110 passes toward the clearance groove 142 of the first intermediate side plate 126 and binds to each other. Therefore, the first receiving body 120 is fixed to the upper portion of the bottom plate 110 to maintain the structure stably. In addition, like the first receiving body 120, the second receiving body 130 also has the fixing protrusion 144 of the second intermediate side plate 136 inserted into the fixing groove 114 of the bottom plate 110, and the bottom plate 110. The fixing piece 112 of) is inserted into the clearance groove 142 of the second intermediate side plate 136 and is stably bound to each other.

4 is a plan view for explaining the bottom of the packaging cushioning material according to the first embodiment of the present invention, Figure 5 is a plan view for explaining the bottom of the packaging buffer material of FIG.

4 and 5, the packaging cushioning material is bent such that the first receiving body 120 and the second receiving body 130 are formed on the bottom plate 110. In this case, the first intermediate bottom plate 126 and the second intermediate bottom plate 136 are positioned to be in contact with each other. When the support part 116 formed on the bottom plate 110 is bent perpendicularly to the bottom plate 110 (ⓒ), as shown in FIG. 3, the fixing protrusion 144 is automatically inserted into the fixing groove 114. The fixing piece 112 is inserted into the clearance groove 142. In addition, the support part 116 supports the lower and side portions of the first receiving body 120 and the second receiving body 130. The protrusion 136a of the second receiving body 130 is positioned at the side of the support 116 to prevent the support 116 from being unfolded over the bottom plate 110 again. Therefore, since the assembly of the packaging cushioning material is completed by one operation of bending the support part 116 to the upper portion of the bottom plate 110, it is easy to assemble the packaging cushioning material in the developed state.

Therefore, the assembling of the packaging cushioning material is completed through the bending of the support part 116, and thus the assembled cushioning material can be easily assembled. The fixing protrusion 144 is inserted into the fixing groove 114, and the fixing piece 112 is Passing toward the free groove 142, and double binding, the structure of the packaging cushioning material is stable. In addition, one of the corrugated raw material (raw material) is manufactured by bending, but the structure of the packaging cushioning material is stable, so that the external shock can be effectively absorbed. In addition, by forming an accommodating space suitable for the size of the camcorder, the user can easily and conveniently store the product and accessories, it can be easily put in and out of the packaging box. The plurality of accommodating spaces can stably accommodate the accessory substrate of the camcorder.

Example 2

FIG. 6 is a perspective view illustrating a packaging shock absorber according to a second embodiment of the present invention, and FIG. 7 is an exploded view of the packaging shock absorber of FIG. 6.

6 and 7, the packaging buffer 200 includes a bottom plate 210, a first accommodating body 220, a second accommodating body 230, and a side reinforcement part 240. The packing cushion according to the present invention may be designed to be suitable for accommodating a camcorder.

The side reinforcement part 240 reinforces both sides of the inner space provided by the first receiving body 220 and the second receiving body 230. Therefore, both sides of the first receiving body 220 and the second receiving body 230 may be connected to each other via a bend line.

The side reinforcement part 240 includes a first support piece 242, a folding piece 244, a reinforcement plate 246, and a second support piece 248. The first support piece 242 is connected to both sides of the first side plate 222 and the second side plate 232 through a bend line. In addition, the folding piece 244 is connected to both sides of the first upper plate 224 and the second upper plate 234 by a bent line, and is connected by the corners of the first support piece 242 and the bent line. To be bent to the bottom of the first top plate 224. The reinforcement plate 246 is connected to one corner of the folding piece 244 via a bend line to cover the side of the internal space. The reinforcement plate 246 is formed corresponding to the internal space provided by the first receiving body 220 and the second receiving body 230, and is provided perpendicular to the bottom plate 210. In addition, the second support piece 248 is connected to both sides of the first intermediate side plate 226 and the second intermediate side plate 236 by a bent line, and mediates the corners of the folded piece 244 and the bent line. Leads to. A first inclined fold line 242a is formed in a direction inclined to the first support piece 242 from the boundary between the first support piece 242 and the folded piece 244. Then, a second inclined fold line 248a is formed in a direction inclined to the second support piece 248 from the boundary between the second support piece 248 and the folded piece 244, and the first inclined fold line 242a. And a trim part T cut adjacent to the second oblique folding line 248a. Accordingly, the folding piece 244 is folded along the first inclined fold line 242a and the second inclined fold line 248a to the lower portion of the first upper plate 224 and the second upper plate 234. In addition, the first support piece 242, the folding piece 244, and the second support piece 248 are formed perpendicular to the bottom plate 210 to support the vertical load acting on the cushioning material for packaging.

Therefore, the packaging cushioning material of the present invention supports vertical loads by the side reinforcement parts 240 formed on both sides, and buffers external shocks so that the structure is stably maintained, thereby allowing the package to be packaged stably.

8 is a cross-sectional view for explaining a receiving space of the packaging cushioning material according to the second embodiment of the present invention.

Referring to Figure 8, the packaging cushioning material is accommodated in a packaging box. Therefore, an accommodation space such as an electric wire and an adapter may be formed between the packaging box and the packaging buffer (C). In the first indentation 228 and the second indentation 238 formed in the packaging cushioning material, an accommodating space for accommodating the camcorder is formed (A). In addition, an accommodation space for accommodating a battery may be formed in the third indentation 239 (Ｂ). Therefore, the plurality of accommodation spaces can stably accommodate the incidental substrate of the packaged object, and the packaging buffer material can buffer the packaged object from external impact.

Therefore, the packaging cushioning material according to the present invention is formed so that the fixing projections of the first and second intermediate side plate and the fixing groove of the bottom plate are bound to each other, thereby maintaining the structure of the packaging buffer material stably. Thus, the packaging cushioning material can safely protect the packaged packaged article from external impact.

In addition, when the bottom plate is bent inward through the bend line, the fixing piece and the fixing groove are automatically bound to the fixing protrusion and the fixing groove, respectively. Therefore, the developed packaging cushioning material can be directly fixed without the need for an adhesive means such as an adhesive, and the assembly process is convenient since the assembly is completed in one operation.

In addition, the packaging cushioning material forms a plurality of accommodation spaces so that the incidental substrate of the packaged object can be stably received.

As described above, the present invention has been described with reference to a preferred embodiment of the present invention, but those skilled in the art various modifications and changes of the present invention without departing from the spirit and scope of the present invention described in the claims below I can understand that you can.

1 is a perspective view for explaining a packaging cushioning material according to a first embodiment of the present invention.

FIG. 2 is a development view of the packaging cushioning material of FIG. 1.

3 is a partial perspective view for explaining a process of assembling the cushioning material for packaging of FIG.

Figure 4 is a plan view for explaining the bottom of the packaging cushioning material according to a first embodiment of the present invention.

FIG. 5 is a plan view illustrating the bottom of the packaging buffer of FIG. 4. FIG.

6 is a perspective view for explaining a packaging cushioning material according to a second embodiment of the present invention.

7 is an exploded view of the packaging cushioning material of FIG. 6.

8 is a cross-sectional view for explaining a receiving space of the packaging cushioning material according to the second embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

110,210: base plate 120,220: first receiving body

130, 230: second receiving body 240: side reinforcement

Claims (10)

Bottom plate; A first incision connected to one end of the bottom plate, a first top plate connected to the first side plate, a first middle side plate connected to the first top plate, a first cut through a boundary between the first top plate and the first middle side plate A first receiving body including a first indentation portion bent inwardly and connected to the first upper plate at a boundary of the first incision portion; And A second cut through the boundary between a second side plate connected to the other end of the bottom plate, a second top plate connected to the second side plate, a second intermediate side plate connected to the second top plate, the second top plate and the second middle side plate A second receiving body including a second indentation portion bent inwardly and connected to the second upper plate at a boundary of the second incision portion; Equipped with The first and second intermediate side plates include a clearance groove provided at each bottom end and a fixing protrusion formed inwardly of the clearance groove from a side bottom end of the clearance groove, wherein the bottom plate is formed therein to the fixing projection. And a fixing piece formed in the fixing piece to receive the fixing piece and a fixing piece which is bent inwardly through an adjacent bend line. The method of claim 1, The second receiving body may further include a third cutout that vertically passes through the boundary between the second side plate and the second top plate, and a third indent that is bent inwardly in connection with the second top plate at the boundary of the third cutout. Packaging cushioning material comprising a. The method of claim 2, An L-shaped outline cutting line is formed on the bottom plate, and is cut by the L-shaped outline cutting line and includes a support for supporting the structures of the first and second indents. Cushioning material. The method of claim 3, The fixing piece and the support is integrally formed, the packaging cushioning material, characterized in that bent together. The method of claim 3, The second indentation portion is a second incision that vertically passes through the boundary between the second upper plate and the second intermediate side plate, a second indentation side plate which is bent inwardly connected to the second upper plate with the second incision; And And a second indentation bottom plate connected to the second intermediate side plate at the boundary of the second incision and bent inward together with the first indentation side plate. The second indentation side plate protrudes into the inner space of the packaging cushioning material at the boundary with the second indentation bottom plate to form a protrusion for supporting the side of the support. The method of claim 2, The third cut portion packaging cushioning material, characterized in that the width of the cut line of the second side plate is narrower than the width of the cut line corresponding to the inlet of the second top plate. The method of claim 1, The first and second intermediate side plate is cushioned for packaging, characterized in that it is cut in the shape of an arc along the movement path of the fixing piece to guide the fixing groove to the free groove. The method of claim 1, And a side reinforcing part for reinforcing both sides of the inner space provided by the first receiving body and the second receiving body. The method of claim 8, The side reinforcement portion may include a first support piece connected to both side portions of the first and second side plates; A folding piece that is connected to both sides of the first and second top plates through a bend line, and is bent to a lower portion of the first top plate connected through a corner and a bend line of the first support piece; A reinforcing plate connected to one edge of the folding piece via a bend line to cover a side portion of the internal space; And And a second support piece connected to side portions of the first and second intermediate side plates and connected to one corner of the folding piece and a bend line. The method of claim 8, A first inclined fold line is formed in a direction inclined to the first support piece from the boundary of the first support piece and the folded piece, and is inclined to the second support piece from the boundary between the second support piece and the folded piece. And a second inclined fold line, and having a trim section cut adjacent to the first and second inclined fold lines.