JP2009119037A - Corrugated fiberboard casket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a box-shaped corrugated fiberboard casket with excellent stability, which is not easily distorted even when receiving loads and is not easily deformed by the change of a temperature or humidity. <P>SOLUTION: For the corrugated fiberboard casket 10, a lower box 12 (box body) is formed by bending the unfolded sheet of a strengthened corrugated fiberboard material. The lower box 12 is provided with a bottom plate 12A, side plates 12B raised roughly vertically on the right and left in the longitudinal direction of the bottom plate 12A, and side planks 12C raised roughly vertically at the front and back in the longitudinal direction of the bottom plate. On the at least center part in the longitudinal direction at the right and left corners of the inner side bottom part of the lower box 12, a diagonal brace plate 16 for supporting the wall surface of the side plate 12B and the wall surface of the bottom plate 12A is provided. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a corrugated cardboard cage, and more particularly to a reinforcing structure for reinforcing the box shape of the corrugated cardboard cage.

  Conventionally, a corrugated cardboard basket is known as an alternative to a wooden basket. Corrugated cardboard boxes are attracting attention as environmentally friendly funerals because they are lighter and more combustible and workable than wooden boxes.

Recently, corrugated cardboard cages using reinforced corrugated cardboard materials have been developed. This type of corrugated board is formed by folding a development sheet of reinforced corrugated board material into a box shape.
For example, as shown in FIG. 11, the unfolded sheet P0 is provided with side plates 2B and 2B on the left and right sides of the rectangular bottom plate 2A, and with end plates 2C and 2C before and after the bottom plate 2A. At the boundary between the bottom plate 2A, the side plate 2B, and the end plate 2C, a vertical V groove y0 and a horizontal V groove x0 for bending are formed with a V-shaped cross section having a substantially 90 ° angle.
From the state shown in FIG. 11, the side plate 2B and the end plate 2C are bent perpendicularly to the bottom plate 2A, and the lower box 2 is assembled by bonding these V-groove surfaces together. Above the lower box 2, an upper lid separately made of reinforced cardboard material is placed so as to be openable and closable.

  Note that Patent Documents 1 and 2 are disclosed as prior art relating to reinforcement of corrugated board cages.

JP, 2004-208860, A Refer to claim 4 and Drawing 4 "reinforcing material 25C". Japanese Utility Model Laid-Open No. 7-17225 Refer to Claims 2 to 4 and FIG. 7 "Thick paper (first reinforcing member 20)".

However, such a conventional corrugated cardboard basket (see FIG. 11) is inferior in load resistance compared to a wooden basket because the strength of the corrugated cardboard material is smaller than that of wood. In particular, since the load acts directly on the lower box, the box shape is greatly distorted when the load is increased.
Further, since the corrugated cardboard material is easily affected by changes in temperature and humidity, there is also a problem that when stored for a long period of time, the box shape is deformed and the product value of the corrugated cardboard bag is impaired.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a corrugated cardboard cage excellent in stability of a box shape that is not easily distorted even when subjected to a load, and that is not easily deformed by changes in temperature and humidity. Yes.

  Under such circumstances, the present inventors conducted a load resistance test assuming the size and position of the load at the time of storage for a lower box size box formed by folding a development sheet made of reinforced corrugated cardboard material. Was repeated to investigate the state of distortion and deformation of the box shape. As a result, the process of shape change when the box is crushed knows that there is a certain law, and by strengthening the specific part of the central part in the longitudinal direction of such a box, It has been found that the strength can be greatly increased.

[First invention]
That is, the cardboard box of the present invention for solving the above problem is
In the corrugated cardboard cage in which the development sheet of the reinforced corrugated cardboard material is folded to form a box,
The box is
The bottom plate,
A side plate that rises almost vertically to the left and right in the longitudinal direction of the bottom plate;
It is provided with a end plate that is raised almost vertically before and after the longitudinal direction of the bottom plate,
A bracing plate that stretches the side plate wall surface and the bottom plate wall surface is provided at the left and right corners of the inner bottom portion of the box and at least in the center portion in the longitudinal direction.

According to the above-described load resistance test by the present inventors, when the load load inside the box increases, first, as shown in FIG. 12 (A), an inward load is applied to the center portion of the left and right side plates 2B. Take it. When the side plate 2B cannot withstand this load, as shown in FIG. 12B, the side plate 2B starts to fall inward and at the same time, the bottom plate 2A begins to bend in the longitudinal direction (front-rear direction).
When the load further increases, as shown in FIG. 12 (C), the side plate 2B further falls inward, causing crushing in the vicinity of the center in the longitudinal direction of the upper part of the box. Bend to fold in the center.

  In the configuration of the first invention, the wall of the bottom plate and the central portion in the longitudinal direction of the side plate is stretched by the bracing plate at the inner bottom portion of the box, thereby preventing the side plate from falling inward in the initial stage. Thereby, the load load to a box is disperse | distributed to the whole box, and box-shaped distortion can be suppressed.

  Further, when the corrugated board is deformed due to changes in temperature and humidity, the side plate usually extends in the longitudinal direction, and this elongation causes the center portion of the side plate to warp inward. According to the structure of 1st invention, a side board is kept straight by stopping the curvature to the inner side of a side board with a bracing board. As a result, deformation of the box shape due to changes in temperature and humidity can be suppressed.

[Second invention]
The corrugated cardboard cage of the second invention has the configuration of the first invention,
The bracing plate is made of a reinforced corrugated board material in which corrugated plates are laminated between a pair of thick plates, and the corrugated strips of the corrugated plate are oriented in the longitudinal direction of the lower box.

According to such a configuration, the bracing plate can be formed of a reinforced corrugated cardboard material together with the box, so that the characteristics of the corrugated cardboard cage that is lightweight and excellent in combustibility are not impaired.
In addition, since the corrugated strips on the corrugated board material of the bracing plate are provided in the longitudinal direction of the box, the bending strength in the longitudinal direction of the bracing board is increased, and the strength of the central part of the corrugated board is effectively increased. It becomes possible to increase.

[Third invention]
According to the tests by the inventors, when bracing plates are provided at the left and right corners of the inner bottom of the box, if a certain range of length is secured with reference to the middle position in the longitudinal direction of the box, the bracing plate is further increased. It was confirmed that the load resistance of the box did not greatly improve even when the length was increased. Specifically, if the bracing plate is provided in the range of about 1/20 to 1/2 from the center position with respect to the full length in the longitudinal direction of the box, the strength of the box is sufficiently durable for general use. Can be increased.

Accordingly, the corrugated cardboard cage of the third invention has the configuration of the first or second invention,
The length of the bracing plate is set in the range of 1/20 to 1/2 of the total length of the box with the longitudinal intermediate position of the bracing plate aligned with the longitudinal intermediate position of the box. The configuration is as follows.

  Thus, by limiting the length of the bracing plate to the above range, it is possible to reinforce the box shape, save the material cost, and reduce the weight of the corrugated board bag.

[Fourth Invention]
The corrugated cardboard cage of the fourth invention has any one of the first to third inventions,
A reinforcing frame is formed at the upper end of the box by folding the ends of the side plate and the end plate inward.

  As described above, when the box is subjected to a load, the vicinity of the center of the upper end of the side plate is locally compressed and crushed immediately before being bent at the center in the longitudinal direction. At the same time, it tilts so that the front and back wives fall inside. In the configuration of the fourth aspect of the invention, the reinforcing frame prevents such collapse of the upper end portion of the side plate and inclination of the end plate. Thereby, the intensity | strength of a cardboard box can be raised.

  In addition to the reinforcing frame, an auxiliary plate for reinforcing the upper center of the side plate may be added to the inner upper portion of the side plate. In this way, the strength of the corrugated board can be further improved by intensively reinforcing the portion where the box is easily crushed.

[First to Fourth Inventions]
The first to fourth inventions can be applied to a corrugated cardboard basket that folds a developed sheet made of a reinforced corrugated cardboard material to assemble a box. Usually, it is assumed that the present invention is applied to the lower box among the lower box and the upper lid of the cardboard box. However, when the upper lid is box-shaped, the present invention is also applied to such an upper lid. can do.
There are no particular limitations on the use (such as for humans and pets) and the type (such as sleeping robes and seats) of cardboard baskets.

  In addition, the 1st-4th invention may be applied independently, and can also apply combining these inventions as needed. Further, the first to fourth inventions may be combined with other inventions described in this specification.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, the present invention is applied to a lower box of a cardboard box.

[First Embodiment]
As shown in FIG. 1, the cardboard box 10 includes a lower box 12 and a lid 13. A lid 13 is placed above the lower box 12. A small window 14 is provided on the upper front side of the lid 13. A kannon door is attached to the small window 14, and by opening these doors, the inside of the bag can be seen.
The dimensions of the corrugated board 10 are, for example, a length of about 170 to 200 cm, a width of about 50 to 70 cm, and a height including the lower box 12 and the upper lid 13 of about 40 to 50 cm.

The lower box 12 and the upper lid 13 are formed of a reinforced corrugated cardboard material. As the reinforced cardboard material, for example, a three-layer reinforced cardboard material having a thickness of about 10 to 20 mm (for example, manufactured by Triwall) is employed. As shown in the partially enlarged view of FIG. 5, this type of corrugated board material has three layers of corrugated plates r1 to r3 interposed between two thick plates (liners) Rf and Rb via partition plates r4 and r5. It is laminated and has excellent pressure resistance and water resistance.
When the V-groove for bending is formed in the reinforced corrugated cardboard material, the other layers are cut using a rotary blade or the like while leaving one of the thick plates Rf and Rb. When the reinforced corrugated board is folded, only the remaining thick plate (liner) is folded and the inclined groove surfaces of the V-groove are brought into close contact with each other. If V-groove processing is performed so that the groove angle of the V-groove is approximately 90 °, adjacent plates bend substantially vertically. As another V-groove forming method, the corrugated board surface can be compressed into a V-shaped cross section with a press or the like.

  A decorative sheet such as a cloth or a film is affixed to the surface of the cardboard box 10 as necessary. By applying such a cosmetic finish, the surface of the corrugated cardboard material is hidden, and the appearance of the bag is finished to a high-class appearance.

As shown in FIG. 2, the development sheet P1 of the lower box 12 is provided with side plates 12B and 12B on the left and right sides of the rectangular bottom plate 12A, and with end plates 12C and 12C before and after the bottom plate 12A. A vertical V groove y1 and a horizontal V groove x1 for bending are formed at the boundary between the bottom plate 12A, the side plate 12B, and the end plate 12C. These vertical V-groove y1 and horizontal V-groove x1 have a V-shaped cross section of approximately 90 °.
A frame plate 12D is provided at the front end portions of the side plate 12B and the end plate 12C with a W groove (a groove formed by arranging V grooves cut at approximately 90 ° in two rows in parallel) interposed therebetween. In the state of FIG. 2, the frame plate 12D is folded back 180 ° by the W groove.

  When the side plate 12B and the end plate 12C are bent perpendicularly to the bottom plate 12A from the state of FIG. 2 and these V-groove surfaces are bonded together with an adhesive, an adhesive tape or the like, the lower box 12 shown in FIG. At the upper end of the lower box 12, four frame plates 12D on the front, rear, left and right are combined to form a reinforcing frame.

  As shown in FIGS. 1 and 3, bracing plates 16 made of reinforced corrugated cardboard material are provided at the left and right corners of the inner bottom of the lower box 12. The bracing plate 16 is a belt-like plate having a certain width and thickness, and is spanned between the side plate 12B and the bottom plate 12A with an inclination of approximately 45 ° (see FIG. 4). The left and right side edges of the bracing plate 16 are cut symmetrically with an inclination of 45 ° with respect to the front and back plate surfaces, and these inclined surfaces are firmly attached to the wall surfaces of the side plate 12B and the bottom plate 12A by an adhesive, adhesive tape or the like. It is fixed to.

The length of the bracing plate 16 is about ½ of the total length of the lower box 12 (about 80 to 100 cm) in a state where the longitudinal middle position of the bracing plate 16 is matched with the longitudinal middle position of the lower box 12. Is set. Further, the width of the bracing plate 16 is set to about 5 to 10 cm.
In addition, since the bracing plate 16 is located in the left and right corners of the inner bottom portion of the lower box 12, it does not interfere with putting the body in the bag. Further, since the bracing plate 16 is hidden by the decorative cloth as the lower box 12 is finished, the bracing plate 16 is not seen inside the lower box 12 when the bag is used.

  As shown in FIG. 5, in the cross section of the bracing plate 16, a laminated structure of corrugated plates r1 to r3 appears between the thick plates Rb and Rf as the internal structure of the reinforced corrugated board material. The corrugated strips of these corrugated plates r 1 to r 3 extend continuously in the longitudinal direction of the lower box 12. Thereby, the bending strength with respect to the longitudinal direction of the bracing plate 16 is secured sufficiently large.

For the lower box 12, the corrugated strips of the corrugated sheet are oriented in a direction orthogonal to the corrugated strips of the bracing plate 16. That is, in the unfolded sheet P1 in FIG. 2, the corrugated strips extend in the vertical direction.
In this way, by making the corrugated strips perpendicular to each other between the lower box 12 and the brace 16, the strength of the lower box 12 in the longitudinal direction and the lateral direction is reinforced in a well-balanced manner. In particular, in the configuration of the present embodiment, the dimensional accuracy of the corner portion between the bottom plate 12A and the side plate 12B is increased, and the high-quality corrugated cardboard cage 10 having high strength at the center portion of the lower box 12 can be obtained. . Of course, it is also possible to reverse the direction of the projections and depressions in the lower box 12 and the bracing plate 16. Even in this case, the strength of the lower box 12 in the longitudinal direction and the lateral direction can be reinforced with a good balance.

Next, the operation and effect of the corrugated cardboard cage 10 will be described.
As shown in FIG. 6, when a downward load is increased inside the lower box 12, a load (see arrow t) is applied to the side plate 12 </ b> B that is pulled by the bottom plate 12 </ b> A and falls inside. However, in the corrugated board 10, since the bracing plate 16 stretches the wall surfaces of the bottom plate 12A and the side plate 12B to prevent the side plate 12B from collapsing, the initial deformation when the lower box 12 is crushed does not occur (FIG. 12). (See (B)). As a result, the load resistance can be greatly improved by suppressing the distortion of the box shape. According to the experiments by the inventors, it was confirmed that the load resistance is increased by 60 to 80 kg in the case with the bracing plate 16 as compared with the case without the bracing plate 16.

  Further, even if the side plate 12B extends in the longitudinal direction and warps inward due to changes in temperature and humidity, the bracing plate 16 supports the wall surface of the central portion of the side plate 12B and stops warping inward. For this reason, the attitude | position of the side plate 12B can be kept straight, and the box-shaped deformation | transformation by the change of temperature and humidity can be suppressed.

  Furthermore, in the corrugated cardboard cage 10, the reinforcing frame (frame plate 12D) is folded back at the upper ends of the side plate 12B and the end plate 12C, so that distortion and deformation of the lower box 12 can also be suppressed by these frame plates 12D. That is, the reinforcing frame (frame plate 12D) can be prevented from falling inside the side plate 12B and the end plate 12C in addition to the tension force of the bracing plate 16, and the strength of the lower box 12 can be increased in combination with the bracing plate 16.

[Second Embodiment]
Next, a second embodiment of the present invention is shown in FIGS. The corrugated cardboard trough 20 of the second embodiment is obtained by adding an auxiliary plate 21 to the inner upper part of the side plate 12B.
The cardboard box 20 includes a lower box 12 and an upper lid 13, and bracing plates 16 similar to those of the first embodiment are provided at the left and right corners of the inner bottom portion of the lower box 12. A reinforcing frame (frame plate D) is formed at the upper end of the lower box 12 by folding the ends of the side plate 12B and the end plate 12C inward.
The auxiliary plate 21 is fixed on the inner upper portion of the side plate 12B and immediately below the reinforcing frame (frame plate 12D) (see FIG. 9). The auxiliary plate 21 is formed by cutting a similar reinforced corrugated cardboard material to a certain width, and has substantially the same length as the brace plate 16 with the corrugated strips facing the longitudinal direction of the lower box 12. .

  According to the second embodiment, the strength of the lower box 12 can be further increased by intensively reinforcing the upper center of the side plate 12B. In addition, since the auxiliary | assistant board 21 is arrange | positioned just under the frame board 12D, it does not become obstructive at the time of use of a bag.

[Third Embodiment]
A third embodiment of the present invention is shown in FIG. In the third embodiment, the present invention is applied to a bag having an octagonal plan shape.
As shown in FIG. 10, the corrugated board 30 is chamfered at the four corners so that the lower box 12 and the upper lid 13 are octagonal when viewed from the plane direction. The upper four corners of the upper lid 13 are chamfered into a triangle to give a polyhedral appearance like jewelry.
Bracing plates 16 similar to those of the first embodiment are provided at the left and right corners of the inner bottom portion of the lower box 12. A reinforcing frame (frame plate 12D) is formed at the upper end portion of the lower box 12 by folding the ends of the side plate 12B and the end plate 12C inward. A chamfered plate 12E is provided at a corner portion connecting the side plate 12B and the end plate 12C.

According to the third embodiment, similarly to the first embodiment, the brace plate 16 and the reinforcing frame (12D) can prevent the lower box 12 from being distorted or deformed.
Moreover, since chamfering like a jewelry is given to the lower box 12 and the upper lid 13, the high-quality feeling of the external appearance can be increased and the design of the bag can be enhanced.

[Other Embodiments]
As mentioned above, although the corrugated board cage | basket of 1st-3rd embodiment was illustrated, embodiment of this invention may be accompanied by various deformation | transformation and a change as follows, without being limited to these.
For example, in the first to third embodiments, the present invention is applied to the lower box 12, but the present invention may be applied to the upper lid 13.
In the first to third embodiments, the frame plate 12D of the lower box 12 is not necessarily provided, and may be omitted as necessary.
Further, the arrangement of the bottom plate 12A, the side plate 12B, and the end plate 12C in the unfolded sheet P1 is not limited to the first to third embodiments. For example, all or part of the end plate 12C can be bent at the front and rear ends in the longitudinal direction of the side plate 12B. It may be provided.
Further, the reinforced corrugated cardboard material is not limited to the three-layer reinforced corrugated cardboard, and other multi-layer corrugated cardboard material, a corrugated cardboard material having a honeycomb structure, or the like may be used.

It is a perspective view which shows the corrugated board bag of 1st Embodiment of this invention. It is the top view which shows the expansion | deployment sheet | seat which assembles the lower box of the cardboard box, and its end view of the broken line direction. It is a top view which shows the lower box of the cardboard box. FIG. 4 is a cross-sectional view taken along line [4]-[4] in FIG. 3. FIG. 5 is an enlarged cross-sectional view of the [5] portion of FIG. 4, showing a bracing plate of the corrugated cardboard basket. It is a fragmentary cross-sectional view for demonstrating the effect | action of the lower box of the corrugated cardboard box. It is a longitudinal cross-sectional view for demonstrating the effect | action of the lower box of the corrugated cardboard box. It is a perspective view which shows the cardboard box of 2nd Embodiment of this invention. It is a cross-sectional view showing a lower box of the cardboard box. It is a perspective view which shows the corrugated board bag of 3rd Embodiment of this invention. It is the top view which shows the expansion | deployment sheet | seat which assembles the lower box of the conventional cardboard box, and its end view of the broken line direction. The process of the shape change accompanying the load increase of a corrugated board bag is shown, (A) is the perspective view before a deformation | transformation, and its arrow direction sectional drawing, (B) is the perspective view after a deformation | transformation start, and its arrow direction sectional view. (C) is the side view at the time of occurrence of crushing, and its arrow direction sectional view.

Explanation of symbols

10 Corrugated cardboard box 12 Lower box (box)
12A Bottom plate 12B, 12B Side plate 12C End plate 12D Frame plate (reinforcement frame)
13 Upper cover 14 Small window 16 Bracing plate 21 Auxiliary plate P1 Deployment sheet x1 Horizontal V groove y1 Vertical V groove Rf, Rb Thick plates r1, r2, r3 Corrugated plates r4, r5 Partition plates

Claims (4)

In the corrugated cardboard cage in which the development sheet of the reinforced corrugated cardboard material is folded to form a box,
The box is
The bottom plate,
A side plate that rises almost vertically to the left and right in the longitudinal direction of the bottom plate;
It is provided with a end plate that is raised almost vertically before and after the longitudinal direction of the bottom plate,
A corrugated board scissors provided with a bracing plate that stretches the side plate wall surface and the bottom plate wall surface at least at the center in the longitudinal direction at the left and right corners of the inner bottom portion of the box.   The corrugated board bag according to claim 1, wherein the bracing plate is made of a reinforced corrugated board material in which corrugated sheets are laminated between a pair of thick plates, and the corrugated strips of the corrugated sheet are in the longitudinal direction of the lower box. Oriented, corrugated cardboard.   The cardboard trough according to claim 1 or 2, wherein the length of the bracing plate is such that the longitudinal intermediate position of the bracing plate coincides with the longitudinal intermediate position of the box. Corrugated cardboard basket set in the range of 1/20 to 1/2 of   4. The cardboard box according to claim 1, wherein a reinforcing frame is formed at the upper end portion of the box body by folding the ends of the side plate and the end plate inward.

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