JP3054026U - Paper cushion - Google Patents

Abstract

(57) [Summary] A sheet-like base material (a) is bent to be assembled into an inner / outer double-wall structure having a recess for fitting a packing article and a buffer space, thereby improving a buffer function and a strength resistance as compared with the conventional case. A paper cushion is provided which is easy to assemble and uses less paper board material. A left and right double wall portion (c) is formed, front and rear cut and raised plates (18) are cut and raised from a bottom plate (1), and lower end portions of left and right inner plates (15) are inserted into locking grooves (19). The assembled state of the double wall portion c is maintained. The cut-and-raised plate 18 serves as a buffer space f.
Therefore, the cushioning function and strength of the paper buffer A are improved. If the cut-and-raised plate 18 is cut and raised from the bottom plate 1 when assembling the paper buffer A, it functions as described above, and the amount of paper board material used and the labor required for assembling the paper buffer are the same as those in the related art.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a paper cushion for protecting a package used for packing electric appliances, precision equipment, and various other articles, and more specifically, a single sheet made of paper board material such as cardboard, paperboard, and cardboard. The present invention relates to a paper buffer which is formed by folding a base material into a box shape.

[0002]

[Prior art]

 Traditionally, resin cushions made of urethane foam or styrene foam have been used as cushions for protecting articles packed in a cosmetic box or the like from a stacking load during storage or a drop impact during transportation. Although these resin shock absorbers are excellent in the strength against the above-mentioned load and the buffering of a drop impact, their use is considered because there is a concern that they may adversely affect the environment during treatment after use, and it is difficult to recycle. You are in a restricted direction.

On the other hand, in recent years, as an alternative to the above-mentioned resin shock absorber, a key portion of a paper board material such as corrugated cardboard is bent, and the key portion is bonded to form a substantially box-like shape. There has been proposed a paper buffer having an inner and outer double-walled structure having a fitting recess and forming a buffer space around the fitting recess. This seed paper buffer solves the above-mentioned disadvantages of the resin buffer, as well as a so-called pulp mold made by using recycled waste paper as a raw material, or a so-called pulp mold made of corrugated cardboard or waste paper in a multilayer or laminated form. It can solve the problems such as the problem of manufacturing cost of the angle material, corner material, etc., which are formed into a L-shaped or V-shaped cross section, and the paper dust is not suitable for packing precision equipment. It is practically used as a convenient buffer.

[0004]

[Problems to be solved by the invention]

 However, in the conventional paper buffer, since the buffer space has a continuous structure (continuous space) surrounding the periphery of the fitting recess, when the packaged article is lightweight, the buffer space has a predetermined buffer function. However, when the packaged article is heavy, it cannot be said that there is no risk that the buffer space cannot exhibit the predetermined buffer function, and the use of heavy goods is sometimes limited. It is also conceivable to load another member into the buffer space for reinforcement. However, in this case, it is not preferable because it takes additional time and cost to produce and load the reinforcement member.

The present invention has been made in view of such a conventional situation, and an object thereof is to assemble a sheet-like base material made of paper board material at a key position and to assemble it into a box shape. In a paper buffer having an inner / outer double wall structure in which a packing recess is provided and a buffer space is formed around the fitting recess, the buffer function and strength of the buffer space are improved. In addition, a paper shock absorber having such advantages that a reinforcing structure for that purpose can be added during the operation of assembling the shock absorber, and the amount of paper board used can be reduced to the same extent as before. Is to provide.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the paper buffer of the present invention comprises at least a bottom plate, left and right outer plates rising at the left and right ends of the bottom plate, and outer surfaces of the respective plates. The left and right upper edge plates bent inward from the upper end of the plate and the left and right inner plates bent downward from the inner end of each upper edge plate form left and right inner and outer double walls, and the bottom plate The front and rear cut-and-raised plates are formed by providing a cut line and a fold line at two positions in front and rear of the, and the lower end portions of the left and right inner plates are inserted and locked into the respective cut-and-raised plates. The gist is that the cut-and-raised plate is cut and raised, and the lower end portions of the left and right inner plates are inserted into the left and right locking grooves to maintain the assembled state of the left and right inner and outer double wall portions. I do.

[0007] In this configuration, after the left and right inner and outer double wall portions are formed, the front and rear cut-and-raised plates are cut and raised from the bottom plate, and the left and right locking grooves are formed on the left and right locking grooves in each of the cut-and-raised plates. By inserting the lower end portion of the inner plate, the assembled state of the left and right inner / outer double wall portions is maintained. In addition, since the front and rear cut-and-raised plates rise inside the left and right inner and outer double walls (that is, the buffer space) and the inside of the fitting recess, the cushioning function and strength of the paper buffer can be improved. Can be done. Since the cut-and-raised plate is formed by a cut line and a fold line provided on the bottom plate, it functions as described above if it is cut and raised from the bottom plate when assembling the paper buffer. The labor required for assembling is almost the same as before.

[0008] The shape of the bottom plate may be various shapes such as a triangle, a quadrangle, a polygon having a pentagon or more, a circle, an ellipse, and other irregular shapes, and the paper buffer may correspond to the shape of the bottom plate. It can be configured to exhibit such a three-dimensional shape. In addition, the cut-and-raised plate is provided at least at two places before and after the bottom plate, but it goes without saying that it may be provided at three or more places.

[0009] As an example of a more specific structure of the present invention, as set forth in claim 2, in the paper buffer according to claim 1, the bottom plate is rectangular, and the left and right side edges of the bottom plate. The left and right outer plates that stand up through the fold line are connected in series, and the top plate of one of the outer plates is bent inward through the fold line and the top plate facing the bottom plate is connected to the upper end of one of the outer plates. An adhesive plate continuously provided through a folding line is bonded to the other outer plate to form a foldable rectangular cylinder, and a cut line and a folding line are provided on the upper surface plate, and the front, rear, left and right edges of the upper surface plate are provided. A left and right inner plate is formed along the upper edge plate along the inner edge of the left and right upper edge plate, and the left and right inner plates are bent downward from the inner ends of the left and right upper edge plates via a fold line. At the front and rear ends of the bottom plate, front and rear outer plates that fit into the front and rear openings of the rectangular cylinder are connected to each other via a folding line, At the outer end of the rear upper edge plate, the inner bottom surface supported by the cut-and-raised plate is bent along the folding line toward the fitting concave portion and bent stepwise in the fitting concave portion. In addition, there is a configuration in which an extension plate that forms an inner side surface facing the front and rear outer plates is provided.

[0010] In the case of such a configuration, the rectangular cylindrical body formed by bending a required portion and bonding the adhesive plate to the outer plate is folded flat by folding the left and right outer plates in the same direction. Can be. After assembling the rectangular cylinder by raising the left and right outer plates at the assembly site, the left and right inner plates are bent downward, and the front and rear cut-and-raised plates are cut and raised from the bottom plate. By inserting the lower end portions of the left and right inner plates into the left and right locking grooves, the assembled state of the left and right inner / outer double wall portions is maintained, and the above-described operation according to claim 1 is obtained. Further, the front and rear outer plates are folded inward through the folding line to fit into the front and rear openings of the rectangular cylinder, and the extension plate is folded inward through the folding line to be folded stepwise in the fitting recess. By forming the inner bottom surface supported by the cut and raised plate and the inner side surface facing the front and rear outer plates, the front and rear inner and outer double wall portions are formed. The front and rear inner and outer double wall portions and the left and right inner and outer double wall portions form buffer spaces on the front, rear, left and right sides of the fitting recess.

[0011] As another example of the more specific structure of the present invention, as described in claim 3, in the paper buffer according to claim 1, the bottom plate is rectangular, and the left and right sides of the bottom plate. The left and right outer plates that stand up through the fold line are connected at the ends, and the upper left and right upper plates that bend inward through the fold line are connected at the upper end of each outer plate. Left and right inner plates that are bent downward at the ends via fold lines are connected in series, and adhesive plates that are connected at the lower ends of the respective inner plates through fold lines are attached to the bottom plate and are foldable. The bottom wall has front and rear outer plates, front and rear upper edge plates, and an inner bottom surface which is bent stepwise in the fitting recess and is supported by the cut-and-raised plate. And an extension plate with front and rear inner surfaces facing the front and rear outer plates, and are connected via a folding line. Is raised.

In this configuration, the left and right inner and outer double walls formed by bending required portions and bonding the respective adhesive plates to the bottom plate are flattened by folding the left and right inner and outer plates outward. It can be folded into a shape. After assembling the left and right inner and outer plates and assembling the left and right inner and outer double walls at the assembly site, the front and rear cut-and-raised plates are cut and raised from the bottom plate, and the cut-and-raised plates are inserted into the left and right locking grooves. By inserting the lower end portions of the left and right inner plates, the assembled state of the left and right inner / outer double wall portions is maintained, and the above-described operation according to claim 1 is obtained. Further, the front and rear outer plates and the front and rear upper edge plates are folded inward along the folding lines, and the front and rear extension plates are bent stepwise in the fitting recesses, and the inner and lower plates are supported by the cut-and-raised plates. If the bottom surface and the inner surface facing the front and rear outer plates are formed, the front and rear inner and outer double wall portions are formed. The front and rear inner and outer double wall portions and the left and right inner and outer double wall portions form buffer spaces on the front and rear and right and left sides of the fitting recess.

[0013]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, the example shown in FIGS. 1 to 7 will be described. FIG. 5 is a perspective view of a paper buffer A of the present example, FIGS. 6 and 7 are enlarged sectional views of the paper buffer A, respectively. FIG. 2 to FIG. 4 are perspective views showing a procedure for assembling the paper buffer A by folding a key portion of the sheet substrate a constituting the paper buffer A. is there.

The sheet-like base material “a” is formed by cutting a paper board material, for example, a paperboard made of a laminated corrugated ball, into a required shape, which is well known in this kind of technical field, and forming a folded line on the inside and an outside It is formed by providing a fold line. That is, the sheet-like base material a used in the present example includes a bottom plate 1 having a rectangular shape in plan view, and left and right outer plates 3 and 4 connected to left and right side ends of the bottom plate 1 via folding lines 2 and 2, respectively. An upper plate 6 connected to the upper edge of one of the outer plates 4 via a fold line 5 and an adhesive plate 8 connected to a side end of the upper plate 6 via a fold line 7 are provided. , 4 are raised along fold lines 2 and 2, the upper plate 6 is bent inward along fold line 5 to face the bottom surface 1, and the adhesive plate 8 is bent downward along fold line 7 and the outer plate is bent. 3 so as to form a foldable rectangular cylinder b.

The upper plate 6 is provided with front and rear cut lines 9 and 9 and left and right fold lines 10 and 10, and along the front and rear left and right edges of the upper plate 6, the front and rear upper edge plates 11 and 11 and the left and right The edge plates 12, 12 are formed. Further, a portion of the upper surface plate 6 surrounded by front and rear cut lines 9 and 9 and left and right fold lines 10 and 10 is provided with cut lines 13 and 14 at a substantially central portion in the left and right direction. The left and right inner plates 15, 15 are formed to bend downward from the ends via the folding lines 10, 10. Then, after assembling the rectangular cylinder b, the left and right inner plates 15, 15 are bent downward along the fold line 10, thereby forming the left and right outer plates 3, 4 and the left and right upper edge plates 12, 12. , And the left and right inner plates 15, 15 to form left and right inner and outer double wall portions c, c. Between the left and right inner and outer double wall portions c, a fitting recess d into which the packaged article fits is formed.

A cut line 16 and a fold line 17 are provided at two front and rear portions of the bottom plate 1 to form front and rear cut and raised plates 18, 18, and each cut and raised plate 18 is provided at the lower end portion of the left and right inner plates 15. Are provided with left and right locking grooves 19 into which the holes are inserted and locked. Then, the respective cut-and-raised plates 18 are cut and raised from the bottom plate 1, and the lower end portions of the left and right inner plates 15, 15 in the left and right double wall portions c, c are inserted into the left and right locking grooves 19. The left and right inner and outer double walls c, c are maintained in an assembled state.

At the front and rear ends of the bottom plate 1, lower back plates 20 and 20, front and rear outer plates 21 and 21, and upper back plates 22 and 22 are sequentially connected via folding lines 23, 24 and 25, respectively. Install. The front and rear outer plates 21 and 21 are formed so as to be able to fit into the front and rear openings b ′ in the rectangular cylindrical body b, and the lower return plate 20 is folded inward along the fold line 23 to be folded on the front and rear ends of the bottom plate 1. At the same time, the outer plate 21 is raised along the fold line 24, and the upper turn plate 22 is turned outward along the fold line 25 to be folded on the lower surface of the upper edge plate 11, so that the outer plate 21 is opened b ′. To maintain the assembled state of the rectangular cylinder b.

Extending plates 30, 30 are connected to outer ends of the front and rear upper edge plates 11, 11 (front and rear ends of the upper surface plate 6) via folding lines 31, 31. The extension plate 30 includes an overlapping surface 32 overlapping the upper edge plate 11, a contact surface 34 abutting on the back surface of the outer plate 21, an inner bottom surface 36 facing the bottom plate 1, and an inner surface facing the outer plate 21. 38 and a locking surface 40 overlapping the bottom plate 1 are sequentially connected via folding lines 33, 35, 37, and 39. The extension plate 30 is folded back along the fold line 31 toward the fitting concave portion d, and is bent stepwise along the fold lines 33, 35, 37, and 39 in the fitting concave portion d, so that the overlapping surface 32 is formed. The upper surface is overlapped with the upper edge plate 11, the contact surface 34 is brought into contact with the back surface of the outer plate 21, the inner bottom surface 36 is opposed to the bottom plate 1, and the cut-and-raised plate 18 is supported. Further, the locking surface 40 is overlapped with the bottom plate 1 to maintain the bent state of the extension plate 30 so as to form the front and rear double wall portions e and e located before and after the fitting concave portion d. .

Reference numeral 41 denotes a locking piece protruding from the lower ends of the left and right inner plates 15, and reference numeral 42 denotes a locking groove into which the locking piece 41 is inserted to maintain the raised state of the inner plate 15. Reference numeral 43 denotes a locking surface which is connected to the left and right ends of the overlapped surface 32 via folding lines 44 and slidably engages with the left and right inner plates 15, and 45 denotes a locking groove 46 provided at a middle and high portion of the inner plate 15. Locking pieces 47 to be inserted and engaged are locking pieces to be inserted into and engaged with locking grooves 48 provided at the lower end of the inner plate 15. These locking surfaces 43 and the locking pieces 45 and 47 are on the inner plate 15 side. , The assembled state of the front and rear double walls e, e is maintained.

The procedure for assembling the paper buffer body A of the present embodiment using the sheet-like base material a configured as described above will be described with reference to FIGS. The left and right outer plates 3 and 4, the upper plate 6, and the adhesive plate 8 are bent in predetermined directions along 5 and 7, and the adhesive plate 8 is bonded to the outer plate 3 to form a rectangular cylinder b (see FIG. 2). ). The rectangular cylinder b can be folded flat by tilting the left and right outer plates 3 and 4 in the same direction, and by stacking a plurality of sheets in the flat state, space can be saved during storage and transportation. As a result, costs for storage and transportation can be reduced.

In a state where the rectangular cylinder b is assembled (in a standing state), the left and right inner plates 15 are bent inward along the folding line 10 and the locking pieces 41 are inserted into the locking grooves 42. Together, the left and right double walls c, c are formed (see FIG. 3). Next, the front and rear cut-and-raised plates 18 are cut and raised from the bottom plate 1, the lower end portions of the left and right inner plates 15 are inserted into the left and right locking grooves 19, and the front and rear outer plates 21, 21 are folded along the folding lines 24, 24. The outer plate 21 is fitted into the front and rear opening portions b 'of the rectangular cylindrical body b by bending along the 25, and the assembled state of the left and right double walls c, c is maintained (see FIG. 4). Further, the extension plate 31 is bent along the fold lines 31, 33, 35, 37, and 39 as described above, and the locking surface 43 and the locking pieces 45 and 47 are engaged with the inner plate 15 side, so that the front and rear sides are formed. Are assembled and the assembled state is maintained (see FIG. 5).

The paper buffer body A thus assembled is provided with a concave portion d for fitting a packaged article, and inner and outer double wall portions c, c, e, e are formed on the front, rear, left and right of the concave portion d. The internal space of each double wall functions as a buffer space f. The front and rear cut-and-raised plates 18 rise inside the left and right inner / outer double wall portions c (that is, the buffer space f) and the fitting concave portion d 1. Can be improved as compared with the conventional case. Since the cut-and-raised plate 18 may be cut and raised from the bottom plate 1 when assembling the paper buffer A, the amount of paper plate used in the sheet-like base material a and the labor required for assembling the paper buffer A are conventionally reduced. The above-described operation and effect can be obtained while maintaining the same level.

Next, an example shown in FIGS. 8 to 10 will be described. FIG. 10 is a perspective view of a paper buffer A ′ of this example, and FIG. 8 is a sheet-like sheet constituting the paper buffer A ′. FIG. 9 is a perspective view showing a procedure for assembling a paper buffer A 'by folding a key portion of the sheet-like substrate a'.

Hereinafter, the same components as those in the above-described embodiment will be denoted by the same reference numerals in the drawings, without redundant description, and only components different from those in the above-described embodiment will be described. In the sheet-shaped base material a 'of this example, left and right outer plates 3, 4 rising through folding lines 2, 2 are continuously provided on the left and right side ends of the bottom plate 1, and each of the outer plates 3.4 is formed. Left and right upper edge plates 12, 12, which are bent inward via folding lines 5, 5, are connected to the upper end, and the left and right upper edges 12, which are bent downward via folding lines 10, at the inner ends of the respective upper edge plates 12. The inner plates 15 and 15 are connected continuously, adhesive plates 52 and 53 are connected to the lower end of each inner plate 15 via a fold line 51, and the adhesive plates 52 and 53 are bonded to the bottom plate 1 and can be folded. The inner and outer double wall portions c ′ and c ′ can be formed.

At the front and rear ends of the bottom plate 1, front and rear outer plates 21, front and rear upper edge plates 11, 11 are bent stepwise in the fitting recess d, and the contact surface 34 and the inner bottom surface 36 are formed. The extension plate 30 ′ in which the inner side surface 38 and the locking surface 40 are sequentially connected via the folding lines 33, 35, 37, 39 is connected continuously via the folding lines 23, 25, 33.

The procedure of assembling the paper buffer A ′ of this example using the sheet-like base material a ′ configured as described above will be described with reference to FIG. The left and right outer plates 3, 4, the upper edge plates 12, 12, the inner plates 15, 15, and the adhesive plates 52, 53 are bent in predetermined directions along 5, 10, 51, and the adhesive plates 52, 53 are attached to the bottom plate 1. To form foldable left and right inner / outer double wall portions c ′ and c ′. The double wall portions c ′ and c ′ can be folded flat by folding the left and right inner and outer plates 3, 4, 15 and 15 outward, respectively, and by stacking a plurality of sheets in the flat state, The space required for storage and transportation can be reduced, and the cost for storage and transportation can be reduced.

In a state where the left and right inner and outer double wall portions c ′ and c ′ are assembled (in a standing state), the front and rear cut-and-raised plates 18 are cut and raised from the bottom plate 1, Then, the lower end portion of the inner plate 15 is inserted to maintain the assembled state of the left and right double wall portions c ′ and c ′. Further, the front and rear outer plates 21, 21, the upper edge plates 11, 11, and the extension plate 30 'are bent in predetermined directions along the folding lines 23, 25, 33, respectively, and the extension plate 30' is further inserted into the fitting recess d. By folding the stairs along the fold lines 35, 37, and 39 and engaging the locking surface 43 and the locking pieces 45, 47 with the inner plate 15 side, the front and rear double wall portions e ', e ′ is assembled and the assembled state is maintained.

The paper buffer body A ′ assembled in this manner has a concave portion d for fitting a packaged article, and has inner and outer double wall portions c ′, c ′, e ′ on the front, rear, left and right sides of the concave portion d. e ′ is formed, and the internal space of each double wall functions as a buffer space f. Since the front and rear cut-and-raised plates 18 stand up in the buffer space f and the fitting concave portion d, the buffer function and the strength of the paper buffer A 'can be improved as compared with the related art. Since the cut-and-raised plate 18 may be cut and raised from the bottom plate 1 when assembling the paper buffer A ', the amount of the paper plate used in the sheet-like base material a' and the labor required for assembling the paper buffer A '. The same advantages as in the above-described embodiment can be obtained, with the above-described functions and effects being obtained while keeping the same as in the related art.

As described above, the example of the embodiment in which the fitting concave portion d is a quadrangle in a plan view (that is, the bottom plate 1 is a quadrangle in a plan view) corresponding to the shape of the packaged article has been described. It goes without saying that various shapes can be changed in accordance with the shape of the present invention without departing from the spirit of claim 1 which is the gist of the present invention.

[0030]

[Effect of the invention]

 As described above, the paper buffer of the present invention has a buffer space formed by inner and outer double walls around the fitting concave portion of the packaged article, and the bottom plate serving as the bottom surface of the fitting concave portion has a cut line. A cut-and-raised plate is formed by providing a bent line, and the cut-and-raised plate can improve the buffer function and the strength of the buffer space as compared with the conventional case. Therefore, it is possible to solve the problem when the reinforcing member provided separately from the buffer is loaded into the buffer space to improve the buffer function and the like, and the workability and the manufacturing cost at the time of assembling and the amount of paper board used are reduced. While this is the same as the conventional one, it has many effects such as being able to cope with the case where the packaged article is heavy.

Further, in the case of the configuration according to claim 2 or claim 3, in addition to the above-mentioned effects, the inner and outer double wall portions on the left and right can be folded by folding the sheet-like base material and bonding important points. For storage and transportation, the double wall is folded flat to save space and reduce storage and transportation costs. The assembling can be performed by a simple operation of setting up the wall portion and bending a key portion, and the above-described effect according to claim 1 can be made more effective.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a sheet-like base material used for a paper buffer.

FIG. 2 is a perspective view showing a state in which the paper buffer is being assembled.

FIG. 3 is a perspective view showing a state in which the paper buffer is being assembled.

FIG. 4 is a perspective view showing a state in which the paper buffer is being assembled.

FIG. 5 is a perspective view showing an assembled state of a paper buffer.

FIG. 6 is an enlarged sectional view taken along the line (X)-(X) in FIG. 5;

FIG. 7 is an enlarged sectional view taken along line (Y)-(Y) in FIG. 5;

FIG. 8 is a plan view showing another example of a sheet-like base material used for a paper cushion.

FIG. 9 is a perspective view showing a state in which the paper buffer is being assembled.

FIG. 10 is a perspective view showing an assembled state of a paper buffer.

[Explanation of symbols]

 A, A ': paper buffer a, a': sheet-like substrate b: rectangular cylinder c, c ': left and right double wall d: fitting recess e, e': front and rear double wall f: buffer space 1: bottom plate 3, 4: left and right outer plate 6: top plate 8: adhesive plate 11: front and rear upper edge plate 12: left and right upper edge plate 15: left and right inner plate 18: cut-and-raised plate 19 : Locking groove 21: front and rear outer plates 30, 30 ′: extension plate 36: inner bottom surface 38: inner side surface

Claims (3)

[Utility model registration claims] 1. A sheet-like base material made of a paper-made plate material is bent and bonded at important points to provide a recess for fitting a packaged article and to form a buffer space around the recess for fitting. A paper shock absorber assembled in a box shape to form a double-walled structure, comprising at least a bottom plate, left and right outer plates rising at left and right ends of the bottom plate, and folding inward from upper ends of the respective outer plates. The left and right upper edge plates, and the left and right inner plates that are bent downward from the inner end of each upper edge plate, form left and right inner and outer double walls, and cut lines at two front and rear portions of the bottom plate. Forming fold lines to form front and rear cut-and-raised plates, and on each cut and raised plate,
Providing left and right locking grooves into which the lower end portions of the left and right inner plates are inserted and locked, cutting and raising the cut-and-raised plate and inserting the lower end portions of the left and right inner plates into the left and right locking grooves, A paper buffer, wherein the left and right inner and outer double walls are maintained in an assembled state. 2. A bottom plate having a quadrangular shape, left and right outer plates rising from left and right side edges of the bottom plate via folding lines, and being folded inward at the upper end of one of the outer plates via folding lines. A bent upper plate facing the bottom plate is continuously provided, and an adhesive plate continuously provided at a side end of the upper plate via a fold line is bonded to the other outer plate to form a foldable rectangular cylindrical body, A cut line and a fold line are provided on the upper surface plate, an upper edge plate is formed along the front and rear left and right edges of the upper surface plate, and the left and right sides are bent downward from the inner ends of the left and right upper edge plates via the fold line. An inner plate is formed to form left and right inner / outer double wall portions. Further, front and rear outer plates to be fitted into front and rear openings of the rectangular cylinder are connected to the front and rear ends of the bottom plate via a folding line. The outer edges of the front and rear upper edge plates are folded back toward the fitting recess through folding lines and stepwise folded inside the fitting recess. And an inner bottom surface which is supported by the cut-and-raised plate,
2. The paper cushion according to claim 1, further comprising an extension plate forming an inner side surface facing the front and rear outer plates. 3. The bottom plate is a quadrangle, and left and right outer plates rising up through folding lines are connected to left and right side ends of the bottom plate, and each of the outer plates is folded inward through folding lines at upper ends thereof. The left and right upper edge plates that bend are connected in series, the left and right inner plates that bend downward through the fold line at the inner end of each upper edge plate are connected in a row, and the lower end of each inner plate is connected through the fold line The left and right inner and outer double walls that can be folded by bonding the adhesive plate that has been continuously attached to the bottom plate, and the front and rear ends of the bottom plate, front and rear outer plates, front and rear upper edge plates,
An extended plate having an inner bottom surface supported by the cut-and-raised plate and having front and rear inner surfaces opposed to front and rear outer plates is provided in a continuous manner via a folding line. Item 7. A paper buffer according to Item 1.