Simple corrugated cardboard products using corrugated cardboard processed parts

Abstract

We provide simple corrugated cardboard products that can be easily joined and assembled, and also easily disassembled. [Solution] A simple corrugated cardboard product is manufactured by combining a corrugated cardboard processed part 2 with a joinable function, a flat panel, a paper rectangular pipe 3, and a resin corner fitting 4, and is equipped with a joining assembly kit part. The paper rectangular pipe is a rectangular pipe made of cardboard or corrugated cardboard with a thickness of 2 to 4 mm, and by inserting the rectangular pipe into a resin corner fitting with 2 to 6 convex shapes that can be joined in various directions, a skeletal member consisting of a box-shaped container and a frame for display items is formed. A corrugated cardboard flat plate with a joining assembly kit part, to which a flat panel that decorates the surface of the simple corrugated cardboard product is attached to the front, back, sides, top, top, and bottom of the skeletal body can be selectively attached, is fitted and fixed to the skeletal member without adhesive, and can be easily disassembled.

Description

Technical Field

[0001] The present invention relates to a cardboard product composed of a cardboard flat processed part having a joinable part, a paper-made square tube-shaped pipe, a resin corner tool, and a flat panel, and using cardboard that can be easily joined and assembled and can also be easily disassembled, a simple cardboard product.

Background Art

[0002] Recently, cardboard has been used instead of resin and utilized in industrial products, but there is a slight decrease in water resistance or strength. In terms of cost and light weight, it is very advantageous, and cardboard products are utilized in products that do not significantly affect strength. There are problems such as the assembly structure becoming complicated due to cardboard parts or not being able to achieve sufficient joining without an adhesive, resulting in complicated work and high costs. Also, due to the complexity of the joining parts or structure, the workability of assembling large joined bodies deteriorates, or it is difficult to reuse the assembled products by disassembling and disassembling.

[0003] In order to provide an inexpensive assembled transport box suitable for cardboard assembled products and transport lines, the assembled transport box includes a blank sheet in which each box element including a bottom plate and four side plates is blanked in a sheet shape so as to form a box body of a predetermined size and shape, and a first pair of assembly frames 15 and a second pair of assembly frames 17 that are fitted and held on two pairs of opposing upper edge portions when the four side plates connected to the bottom plate are raised by a first folding line, and a corner joint that connects the first assembly frame and the second assembly frame located at the corner portion of the box body and enables stacking of the transport box 1. It has been proposed that a locking flat plate portion that horizontally projects outward from the box body is provided on either one or both of the first pair of assembly frames 15 and the second pair of assembly frames 17 (see Patent Document 1).

[0004] As a prefabricated cabin and assembly method thereof that can simplify the structure, prevent wall tilting, and improve workability during assembly, the prefabricated cabin is formed in a hollow, approximately rectangular prism shape, comprising at least a pair of opposing first walls and a second wall formed to straddle the pair of first walls. The second wall is formed to be detachably engaged with two sides flanking a predetermined corner at the same position on the pair of first walls. The second wall is formed in a shape that can be folded into an L-shape at the predetermined corner of the pair of first walls. Multiple types of walls constituting the prefabricated cabin have a two-layer structure in which the outer layer of each wall is made of corrugated cardboard and the inner layer of the wall is made of foamed cushioning material. A design has been proposed in which the hollow portion is formed by being surrounded only by the foamed cushioning material of the inner wall layer (see Patent Document 2).

[0005] To enhance the usability of the packaging box, the packaging box, which forms a hexahedron in its basic state, comprises side plates, a top plate, and a bottom plate that form a rectangular tube in its basic state, and an inner flap, a first outer flap, and a second outer flap connected to these, respectively. The packaging box also comprises a bottom crease line extending linearly on the bottom plate and the second outer flap, a top crease line extending diagonally on the inner flap, and a holding means. In the deformed state, which is a transformation from the basic state, the top plate is positioned above the side plates, and the bottom plate is positioned below the top plate. In addition, the bottom crease line is bent convexly toward the top plate, and the top crease line is bent and positioned along the boundary line between the top plate and the first outer flap. The holding means has been proposed to maintain the bending angle of the bottom crease line and the position of the top crease line relative to the boundary line between the top plate and the first outer flap in the deformed state (see Patent Document 3).

[0006] As a collapsible storage box and storage method using the same, suitable for storing large quantities of workpieces that are easily oxidized by moisture in the air in a factory, the collapsible storage box comprises: at least one foldable cylindrical member defining a polygonal cavity in cross-section; a lid member having a first flat plate portion positioned at the upper end of the cavity defined by the at least one cylindrical member and a first side plate portion formed integrally with the first flat plate portion and substantially perpendicular to the first flat plate portion; and a bottom member having a second flat plate portion positioned at the lower end of the cavity defined by the at least one cylindrical member and a second side plate portion formed integrally with the second flat plate portion and substantially perpendicular to the second flat plate portion. At least one through hole is formed in the first flat plate portion or at least one cylindrical member (see Patent Document 4).

[0007] A novel portable toilet assembly kit has been proposed that allows for the construction of a portable toilet with high rigidity despite having a relatively small number of parts, and a novel portable toilet constructed using the said portable toilet assembly kit, comprising a portable toilet assembly kit for constructing a portable toilet 1 made of parts made of corrugated cardboard sheets, comprising four rectangular toilet body parts that are assembled in a grid pattern to form the toilet body, a box-shaped toilet seat part that is placed at the upper end of the toilet body with its open end facing downward to form the toilet seat, and two reinforcing parts that are arranged diagonally inside the toilet body to support the inner corners of the toilet body (see Patent Document 5).

[0008] Furthermore, the opposing side panels of the cardboard assembly box are equipped with a connecting assembly kit section for a group of cardboard pieces for constructing a box-shaped container and display items, which is made up of a cardboard sheet processed part with a connectable section, a paper rectangular pipe, and a resin corner fitting. However, simple cardboard products for the parts to which these cardboard pieces, paper rectangular pipes, and resin corner fittings are attached have not yet been formed. Furthermore, an auxiliary frame is becoming necessary that provides a handle around the entire perimeter of the top edge of the assembled box, rather than on the cardboard box panel side, to serve as a grip when moving the assembled box container by hand. As a result, the containers are being constructed in various shapes. Equipment and facilities for this type of exhibition require characteristics such as low cost, ease of storage during normal times, and excellent disposability after use. Therefore, currently, simple containers or exhibition supplies constructed by combining cardboard, which are easy to transport, assemble, and install, are common. [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] Japanese Patent Publication No. 2021-31074 [Patent Document 2] Japanese Patent Publication No. 2020-105757 [Patent Document 3] Japanese Patent Publication No. 2019-172293 [Patent Document 4] Japanese Patent Publication No. 2017-149483 [Patent Document 5] Japanese Patent Publication No. 2024-158175 [Overview of the project] [Problems that the invention aims to solve]

[0010] In the assembly of a simple corrugated cardboard product, which combines corrugated flat sheet parts with connectable sections, paper rectangular pipes, resin corner fittings, and flat panels, it is expected that the columnar portion of the paper rectangular pipe will be formed from a combination of strength-retaining and support-maintaining resin corner fittings in order to ensure strength. However, this corrugated cardboard part complicates the structure, and there are problems in that sufficient bonding cannot be achieved without adhesive. Furthermore, the complexity of the connecting parts or structure makes it difficult to assemble large assembled products, and also makes storage difficult after disassembly.

[0011] This invention was made in view of the above circumstances, and there is a need to provide an assembly-type corrugated cardboard cabin and a method for assembling an assembly-type corrugated cardboard cabin product that can simplify the construction of a box-shaped container structure made primarily of corrugated cardboard for storing articles, while also enabling disassembly and storage, and improving the workability related to assembly. However, when constructing cardboard containers and large display containers by combining corrugated cardboard sheets without using adhesives or fasteners, a large number of reinforcing parts are required to provide sufficient rigidity to withstand multiple uses. A large number of parts makes the assembly process complicated, making quick installation difficult.

[0012] This invention was completed in view of the aforementioned technical problems, and aims to provide a novel, easily assembled corrugated cardboard product using corrugated cardboard processed parts, specifically a joining and assembly kit, which allows for the construction of corrugated cardboard containers and large containers for display items without using adhesives or fasteners, while maintaining a relatively small number of parts, thereby increasing decorative appeal and high rigidity. [Means for solving the problem]

[0013] In constructing a simple corrugated cardboard product by combining corrugated cardboard processed parts with joinable functions, flat panels, paper rectangular pipes, and resin corner fittings, the corrugated cardboard processed parts include a joining assembly kit section, The paper rectangular pipe is a rectangular pipe made of cardboard or corrugated cardboard with a thickness of 2 to 4 mm. By inserting the rectangular pipe into resin corner fittings with 2 to 6 convex directions that can be joined in various directions, a skeletal member consisting of a box-shaped container and a frame for display items is formed. A corrugated cardboard sheet with a joining assembly kit, to which flat panels that decorate the surface of the simple corrugated cardboard product are attached to the front, back, sides, top, top, and bottom of the skeletal member, is fitted and fixed to the skeletal member without adhesive, and the product is also easy to disassemble. This is a simple corrugated cardboard product using corrugated cardboard processed parts.

[0014] The corrugated cardboard flat sheet with the joining assembly kit part is a rectangular shape with a thickness of 3 to 5 mm, and has one raised projection at intervals of 300 to 500 mm in the length direction of the rectangle. The raised projection has a horizontal length of 200 to 300 mm and a vertical width of 60 to 80 mm, and has partially cut lines, half-cut lines, and crease lines on its inner surface, and is joined and fixed to a paper rectangular pipe by a folded shape with a 40 mm vertical width at the projection and a 20 to 30 mm vertical width at the tip of the raised projection. Furthermore, in the structure of the corrugated cardboard, it was clearly demonstrated that the fixing force to the skeletal member by the locking function of the joining assembly kit part is increased by the half-cut line made by cutting one side of the paper surface of the 3 to 5 mm thick corrugated cardboard with paper sheets attached to both sides with a bellows-fold paper member at the center, due to the thickness and the repulsive force on the opposite side due to the cut on one side, thereby increasing the joining force.

[0015] The protruding part of the corrugated cardboard flat sheet with the joint assembly kit is the part that is joined and secured to the rectangular tubular pipe made of paper. The tip of the protruding part has a half-cut section with a width of 20-30 mm, a boundary line between the corrugated cardboard flat sheet and the protruding part, and a crease line that allows the protruding part to be folded along the width line of the part where it is raised three-dimensionally. Cut lines are provided in the rectangular corrugated cardboard flat sheet with a cut line that is the width of the rectangular tubular pipe and the protruding part with a cut line that is the width of the rectangular tubular pipe, so that the protruding part is raised three-dimensionally, thus forming a three-dimensional joint locking function when joined to the rectangular tubular pipe. A rectangular cutout is provided in the center of the corrugated cardboard sheet, and a new decorative flat panel is attached to the entire surface to increase both decorative appeal and strength. In addition, one to five three-dimensional joint locking functions are provided on one side of the corrugated cardboard sheet to strengthen the bond.

[0016] The paper rectangular pipes that constitute the skeletal frame members that maintain the strength of the simple corrugated cardboard products are rectangular pipes made of cardboard or corrugated cardboard with a thickness of 2 to 4 mm and a length of 100 to 2000 mm. They are selectively cut according to the length of the simple corrugated cardboard product group and used according to the dimensions of the desired product group. The resin corner fittings are connectors that can join the selectively cut rectangular rectangular pipes in various directions and form a skeletal member that can be inserted in 2 to 6 directions. The front, back, side, top, top, and bottom surfaces of the skeletal member are selectively fitted according to the shape of the product, and a three-dimensional joining locking function part, which is a corrugated cardboard plate with a connecting assembly kit section to which a flat plate panel is attached, is attached without adhesive, and the decorative flat plate panel is attached to the entire surface of the skeletal member to enhance its decorative appeal.

[0017] This simple corrugated cardboard product, which consists of a flat panel decorated on its entire surface, is attached to a skeletal structure by fitting and joining corrugated cardboard sheets with a three-dimensional joining locking mechanism without the use of adhesive. It can be used as a simple partition, screen, storage container for goods, exhibition hall storage box, explanatory table, document stand, explanatory document display board, or sample stand. After use, it can be disassembled and stored as corrugated cardboard processed parts, or corrugated cardboard sheets with the joining assembly kit attached to the flat panel, paper rectangular pipes, and resin corner fittings. [Effects of the Invention]

[0018] This invention constructs a box-shaped container and display supplies by combining a three-dimensional joining lock function part of a cardboard flat plate with a joining assembly kit, a cardboard flat plate processed part having a joinable part, a paper square tube-shaped pipe, and a resin corner fitting, thereby constituting a skeletal member composed of a box-shaped container and a frame for display items. Optionally, among the front, back, side, etc. of the skeletal member, the cardboard flat plate with a connection assembly kit can be fitted and fixed without an adhesive and can be easily disassembled, so that a simple container that is not used long-term as a simple cardboard product and a temporary display tool can be easily assembled and configured, and can also be disassembled and stored. Also, by variously changing each part of the cardboard processed part, the paper square tube-shaped pipe, the resin corner fitting, and the flat plate panel, it has become possible to easily manufacture box-shaped containers, display items, and screen products with different shapes, dimensions, and surface patterns. Also, since the product was also able to withstand strength, it was also able to store various articles and instruments.

Brief Description of the Drawings

[0019] [[ID=�]] [Figure 1] It is a perspective view showing an example of a part using a cardboard processed part and a simple cardboard product. A: Cardboard processed part having a joining assembly kit part B: Finished product (simple cardboard product) [Figure 2] It is a view showing the planar state before processing of a cardboard processed part having a joinable part. [Figure 3] It is a perspective view showing the three-dimensional state of a cardboard plate processed part having a joinable part. A: Three-dimensional cardboard processed part (with a three-dimensional lock part) B: Decorative flat plate panel C: Joining member of a cardboard flat plate with a joining assembly kit part [Figure 4] It is a perspective view showing the state before assembly of parts from a cardboard processed part, a three-dimensional cardboard jig, a paper square tube-shaped pipe, a resin corner fitting, and the state of the lock jig. A: Cardboard processed part (joining assembly kit part) B: Assembly state of a paper square tube-shaped pipe, a resin corner fitting, and parts in a skeletal member [Figure 5]This is a perspective view showing the different types of paper rectangular pipes and resin corner fittings. A: Paper rectangular pipe B: Types of resin corner fittings (resin corner fittings with 2-6 direction convex shapes) [Figure 6] This is a perspective view of the types of easily assembled corrugated cardboard parts, consisting of paper rectangular pipes, resin corner fittings, and skeletal components. A: Unit B: Cube C: Assembled multilayer [Figure 7] This is a perspective view of a product using a box-shaped container (storage container) frame and three-dimensional corrugated cardboard parts. A: Frame B: Finished product with decorative corrugated cardboard parts fitted into the frame [Figure 8] Figure 7 shows the types of panels required for the three-dimensional corrugated cardboard parts needed for the finished product. A: Front B: Side C: Back, D: Top E: Bottom [Figure 9] This is a perspective view of a product using a box-shaped container (storage container) frame and three-dimensional corrugated cardboard parts. A: Frame B: Finished product with decorative corrugated cardboard parts attached. [Modes for carrying out the invention]

[0020] The following describes embodiments for implementing the present invention based on the drawings, but the present invention is not limited to these embodiments. [Examples]

[0021] As shown in Figure 1A, in constructing a box-shaped container and display items by combining corrugated cardboard processed parts having connectable parts, paper rectangular pipes, resin corner fittings, and flat panels, the corrugated cardboard processed parts are equipped with a connecting assembly kit part, The paper rectangular pipe is a rectangular pipe made of cardboard with a thickness of 3 mm. By inserting the rectangular pipe into resin corner fittings with convex shapes in 2, 3, or 4 directions that can be joined in various directions, a skeletal member consisting of a box-shaped container and a frame for display items is formed. A corrugated cardboard sheet with a connecting assembly kit, to which decorative flat panels are attached to the front, back, sides, and top of the skeletal body, is joined and fixed to the skeletal member without adhesive, and can be easily disassembled, resulting in a simple corrugated cardboard product using the corrugated cardboard processed parts shown in Figure 1B.

[0022] As shown in Figure 2, the corrugated cardboard flat sheet with a connecting assembly kit (with locking function), which is a corrugated cardboard processed part, is a 3mm thick corrugated cardboard flat sheet in two types of rectangular shapes: square and rectangular. The rectangular shape has a raised projection with a locking function at a rate of one every 500mm in the length direction of the vertical and horizontal directions. The raised projection is 250mm long and 70mm wide, and as shown in Figure 2, it is processed to have partially cut lines, half-cut lines and crease lines on the inner surface, with a 40mm projection and a 20mm wide half-cut section at the tip, to finish the corrugated cardboard processed part shown in Figure 3A. A 2mm thick decorative flat panel is then attached and joined to a paper rectangular pipe, which is the skeletal member, and fixed in place to produce the product shown in Figure 1B.

[0023] As shown in Figure 4A, the three-dimensional ridged projection of the corrugated cardboard sheet with the connecting assembly kit is the part that is joined and connected to the rectangular tubular pipe made of paper. As shown in Figure 2, a 20 mm wide half-cut section is made at the tip of the ridged projection, and a scribed line is made which is the boundary line between the corrugated cardboard sheet and the ridged projection, as well as a line that allows the ridged projection to be folded to the width line of the part where it is raised three-dimensionally. The width of the rectangular tubular pipe on the corrugated cardboard sheet where the ridged projection is raised three-dimensionally is cut out along the width of the rectangular tubular pipe on the surface of the ridged projection. As shown in Figure 4B, the three-dimensional joining lock part of the corrugated cardboard processed part is joined to the rectangular tubular pipe, and a rectangular cutout is made in the center of the corrugated cardboard processed part, and a decorative panel with a floral pattern in a black colored pattern is attached thereto. The three-dimensional joining lock part was attached to one side of the corrugated cardboard sheet used for the corrugated cardboard processed part.

[0024] As shown in Figure 5, the paper rectangular pipes that make up the skeletal members of the frame for the exhibits are 3mm thick cardboard rectangular pipes with lengths of 200mm (4 pieces), 250mm (6 pieces), 400mm (4 pieces), and 500mm (6 pieces). They are cut according to the length of the product group, and the resin corner fittings are inserted into resin corner fittings with convex shapes in 3 directions (8 pieces) and 4 directions (4 pieces) that can join the rectangular pipes in various directions to form the skeletal members. A rectangular cutout is selectively made in the center of the corrugated cardboard processed material on the front, back, sides, top, and bottom of the skeletal members, and a decorative panel is attached to the entire surface of that surface. In addition, corrugated cardboard processed parts with connecting assembly kits are joined and attached without adhesive.

[0025] As shown in Figure 6B, corrugated cardboard parts with connecting assembly kits are joined and attached to the skeletal members without adhesive, and the corrugated cardboard flat sheets with connecting assembly kits and decorative panels A, B, C, and D, as shown in Figure 8, are attached to the entire surface. The box-shaped exhibit was used together with the exhibition hall storage box and explanatory table, but after use, the three-dimensional protruding parts made of corrugated cardboard parts with connecting assembly kits could be separated from the paper rectangular pipes, and the corrugated cardboard parts with connecting assembly kits, paper rectangular pipes, and resin corner fittings could be disassembled and stored. [Examples]

[0026] As shown in Figure 1A, the kit comprises a connecting assembly part of a group of corrugated cardboard components for constructing a box-shaped container and display items, which are made up of corrugated cardboard processed parts with connectable parts, paper rectangular pipes, resin corner fittings, and flat panels. The paper rectangular pipe is a square cylindrical pipe made of cardboard with a thickness of 3 mm. By inserting the rectangular cylindrical pipe into resin corner fittings with convex shapes in 3 or 4 directions that can be joined in various directions, a skeletal member consisting of the frame of a box-shaped container is formed. The corrugated cardboard product is a simple corrugated cardboard product using corrugated cardboard parts with joinable parts as shown in Figure 9, which are selected to be joined and fixed to the front, back, sides, and top of the skeletal member without adhesive.

[0027] As shown in Figure 2, the corrugated cardboard sheet with the connecting assembly kit is a 3mm thick corrugated cardboard sheet in two types of rectangular shapes: square and rectangular. The rectangular sheet has a raised projection at a rate of one every 300mm along its length and width. The raised projection is 250mm long and 70mm wide, and as shown in Figure 2, it has partially cut lines, half-cut lines, and crease lines on its inner surface. The 40mm projection of the raised part and the 20mm wide half-cut part at the tip are joined and fixed to a paper rectangular pipe to create the product shown in Figure 9.

[0028] As shown in Figure 4A, the ridged protrusion of the corrugated cardboard processed part with the connection assembly kit is the part that is joined and connected to the cardboard rectangular tubular pipe. As shown in Figure 2, a 20 mm wide half-cut section is made at the tip of the ridged protrusion, and a scribed line is made which is the boundary line between the corrugated cardboard sheet and the ridged protrusion, as well as a line which is the width line of the part where the ridged protrusion can be folded to create a three-dimensional raised section. The width of the rectangular tubular pipe of the corrugated cardboard sheet where the ridged protrusion is in a three-dimensional raised state and the width of the rectangular tubular pipe of the ridged protrusion are cut out as lines. As shown in Figure 4B, a rectangular cutout is made in the center of the corrugated cardboard sheet, corresponding to the three-dimensional joining lock section in the corrugated cardboard processed part in Figure 4A, for joining to the rectangular tubular pipe. One of the three-dimensional joining lock sections is attached to one side of the corrugated cardboard sheet as shown in Figure 4A.

[0029] The rectangular cardboard pipes that make up the skeletal members of the assembled box-shaped container frame shown in Figure 5B are 3mm thick cardboard rectangular pipes with lengths of 200mm, 300mm, 500mm, 800mm, and 1800mm. They are cut according to the length of the corrugated cardboard product group, and the skeletal members are constructed by inserting the rectangular cardboard pipes into resin corner fittings with convex shapes in 2, 3, 4, and 5 directions that can be joined in various directions, according to the dimensions of the desired product group. A corrugated cardboard processed part with a joining assembly kit, which has a rectangular cutout in the center of the corrugated cardboard processed part, is selectively joined and attached to the front, back, side, top, and bottom of the skeletal member without adhesive, and a flat panel with decoration covering the entire surface of the rectangular cutout is attached to the center of the corrugated cardboard processed part.

[0030] As shown in Figure 9A, the box-shaped container and exhibit, which consisted of a skeletal frame to which corrugated cardboard sheets with connecting assembly kits were joined and attached without adhesive, and decorated corrugated cardboard sheets for the protruding parts of the connecting assembly kits were attached to the entire surface, were used as exhibition hall storage boxes and explanatory tables, and after use they were disassembled into connecting parts consisting of the protruding parts of the corrugated cardboard sheets with connecting assembly kits, paper rectangular pipes and resin corner fittings and stored. [Explanation of Symbols]

[0031] 1. Simple corrugated cardboard products using processed corrugated cardboard parts. 2. Cardboard processed parts (joining assembly kit parts) 3. Paper rectangular tubular pipe (square tubular pipe) 4. Resin corner tool 5. Structural members 6 Panel bonding surface to skeletal member 7 Convex protrusion 8 cut lines, 9 Half-cut line 10 grid lines 11. Corrugated cardboard parts with decorative panels 12 Simple partitions, screens, 13 Box-shaped containers (goods storage containers) 14. Exhibits (storage boxes in the exhibition hall) 15 Decorative corrugated cardboard sheets 16. Three-dimensional state of the locking mechanism (cardboard processed part) 17. Cut-out blank area 18 Cardboard surface 19. Presentation table, document stand 20 Display stand for explanatory materials and sample stand 21 Decorative Panels 22 Joining components for corrugated cardboard flat sheets with assembly kit parts

Claims

1. In constructing a simple corrugated cardboard product by combining corrugated cardboard processed parts with joinable functions, flat panels, paper rectangular pipes, and resin corner fittings, the corrugated cardboard processed parts include a joining assembly kit section, The paper rectangular tubular pipe is a rectangular tubular pipe made of cardboard or corrugated cardboard with a thickness of 2 to 4 mm. By inserting the rectangular tubular pipe into resin corner fittings with 2 to 6 convex directions that can be joined in various directions, a skeletal member consisting of a box-shaped container and a frame for display items is formed. A joining member of a corrugated cardboard flat sheet with a joining assembly kit, to which a flat panel for decorating the surface of the simple corrugated product is attached selectively to the front, back, sides, top, top, and bottom of the skeletal member, is fitted and fixed to the skeletal member without adhesive, and is also characterized by being easily disassembled.

2. The corrugated cardboard flat sheet with a joining assembly kit part is a rectangular body with a thickness of 3 to 5 mm, and has one raised projection at intervals of 300 to 500 mm in the length direction of the rectangle, and the raised projection has a horizontal length of 200 to 300 mm and a vertical width of 60 to 80 mm, and has partially cut lines, half-cut lines and crease lines on its inner surface, and is joined and fixed to a paper rectangular pipe in a folded manner with a 40 mm vertical width raised projection and a 20 to 30 mm vertical width half-cut line portion at the tip, as described in claim 1.

3. The protruding part of the corrugated cardboard flat sheet with the joint assembly kit is the part that is joined and secured to the rectangular tubular pipe made of paper. The tip of the protruding part has a half-cut section with a width of 20 to 30 mm, a boundary line between the corrugated cardboard flat sheet and the protruding part, and a crease line that allows the protruding part to be folded along the width line of the part where it is raised three-dimensionally. Cut lines are provided in the rectangular corrugated cardboard flat sheet with a cutout line that matches the width of the rectangular tubular pipe, and the protruding part with a cutout line that matches the width of the rectangular tubular pipe, so that the protruding part is raised three-dimensionally, thus forming a three-dimensional joint locking function when joined to the rectangular tubular pipe. A simple corrugated cardboard product using a corrugated cardboard processed part according to claim 1 or 2, characterized in that a rectangular cutout is provided in the center of the corrugated cardboard sheet, a new decorative flat panel is attached to the entire surface to increase decorative appeal and strength, and one to five three-dimensional joining locking functions are provided on one side of the corrugated cardboard sheet to strengthen the fixation.

4. The paper rectangular tubular pipes that constitute the skeletal frame members that maintain the strength of the simple corrugated cardboard product are rectangular tubular pipes made of cardboard or corrugated cardboard with a thickness of 2 to 4 mm and a length of 100 to 2000 mm, and are selectively cut according to the length of the simple corrugated cardboard product group and used according to the dimensions of the desired product group, and the resin corner fittings are connectors that can join the selectively cut rectangular tubular pipes in various directions and are skeletal members that can be inserted in 2 to 6 directions, and the front, back, side, top, top, and bottom surfaces of the skeletal member are selectively attached according to the shape of the product by a three-dimensional joining lock function part which is a corrugated cardboard flat plate with a connecting assembly kit part to which a flat plate panel is attached, without adhesive, and the decorative appearance is enhanced by attaching a flat plate panel that is decorated on the entire surface to the skeletal member, characterized in that the simple corrugated cardboard product using the corrugated cardboard processed parts according to claim 1 or 2.

5. A simple corrugated cardboard product is a flat panel made by fitting and joining a corrugated cardboard flat sheet with a connecting assembly kit to a skeletal member without adhesive using a three-dimensional joining locking mechanism, and decorating the entire surface. This product is used as a simple partition, screen, storage container for goods, exhibition hall storage box, explanation table, document stand, explanatory document display board, and sample stand. Furthermore, after use, it can be disassembled and stored as a corrugated cardboard processed part, or a corrugated cardboard flat sheet with a joining assembly kit to which the flat panel is attached, a paper rectangular pipe, and a resin corner fitting. This is a simple corrugated cardboard product using a corrugated cardboard processed part as described in claim 1 or 2.

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