JPH0966929A - Window hole structure for corrugated fiberboard, and corrugated fiberboard box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a window hole as large as possible, and make the taking out of a commodity easier by a method wherein a molding member which is fitted on a window hole of a corrugated fiberboard, is rigidly bonded with a joint plate to greatly increase the strength of the window hole part. SOLUTION: To each edge of a through hole for a rectangular window hole 3 of a corrugated fiberboard 1, a molding member 5 made of a synthetic resin, of which the cross section is a U-shape, is respectively fitted to reinforce the window structure. For such a window structure, at a position which corresponds with a butted part of the molding members 5 to each other at the corner part of the through hole 4, a notch-form joint space 6 is formed. Then, a joint plate 7 made of a synthetic resin is fitted in the joint space 6, and in addition, the joint plate 7 and the molding member 5 are heat-welded in an area Y, and the all molding members 5 are rigidly bonded into a frame form by respective joint plates 7. By integrating all the molding members 5, an extremely high strength is provided in every direction, and the reduction in strength of the corrugated fiberboard 1 due to the providing of the window hole 3 can be sufficiently compensated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a window hole structure suitable for corrugated board and a corrugated cardboard box formed with window holes in side plates.

[0002]

2. Description of the Related Art In order to take out a product from the side, a square window hole is sometimes formed in a side plate of a cardboard box. Conventionally, this window hole is formed by cutting out a quadrangular through hole in a corrugated board, and mounting a molding member having a U-shaped cross-section and diagonally cutting both ends on four sides of the through hole. It is configured so that the parts are butted.

[0003]

In the conventional window hole structure described above, since the molding members are disjointed and not fixed, there is a risk that they will come off when a load is applied. Further, since the molding members are disjointed and the load applied to the side plate is concentrated on both sides of the window hole, the strength of the side plate is reliably reduced by the provision of the window hole. In order to eliminate such a problem, it is sufficient to rigidly join the abutting portions of all the molding members to form a complete frame, but there is no rational means for easily and surely rigidly joining the molding members. .

The present invention has been made in view of the above, and a first object thereof is to provide a window hole structure capable of easily and reliably rigidly joining molding members mounted on each side of the through hole. To do. A second object is to provide a cardboard box to which such window structure is applied.

[0005]

In order to achieve the above-mentioned first object, the present invention is to form a polygonal through hole in a corrugated board and to make a synthetic resin with a U-shaped cross section on each side of the through hole. In the window hole structure of the corrugated board in which the molding members are respectively attached and the ends of the molding members adjacent to each other are butted against each other, in the corner portion of the through hole or in the vicinity thereof, at the butted portion between the molding members. Form a notched or hole-shaped joint space at the corresponding positions, fit a joint plate made of synthetic resin into this joint space, heat weld the joint plate and the molding member, and attach all molding members through each joint plate. Provided is a corrugated window hole structure rigidly joined in a frame shape.

In order to achieve the second object, the present invention also provides a corrugated cardboard box having side windows formed with the following window holes. A polygonal through-hole is formed, and a molding member made of synthetic resin having a U-shaped cross section is attached to each side of the through-hole, and the ends of adjacent molding members are abutted to each other. A notched or hole-shaped joint space is formed at the corner of the through hole or in the vicinity thereof so as to correspond to the abutting portion of the molding members. A joint plate made of synthetic resin is fitted into the joint space, the joint plate and the molding member are heat-welded, and all the molding members are rigidly joined in a frame shape through the joint plates.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 is a front view of a corrugated board in a half section, FIG. 2 is an exploded perspective view showing a window hole structure,
FIG. 3 is an enlarged sectional view taken along the line AA of FIG.

The corrugated board 1 is made of plastic (polypropylene) and has a core member 2 between two substrates 2a and 2b.
This is a well-known structure in which c is innumerably molded. A rectangular window hole 3 is formed in this corrugated board 1. As shown in FIG. 1, the window hole 3 is formed by forming a rectangular through hole 4 in the corrugated board 1 and mounting four molding members 5 on each side of the through hole 4. The molding member 5 is made of synthetic resin and has a groove 5a having a width corresponding to the plate thickness of the corrugated board 1, and the edge of the corrugated board 1 is fitted into the groove 5a. Both ends of each molding member 5 are cut at about 45 degrees, and the molding members 5 and 5 adjacent to each other are separated by 9 degrees.
Butt at an angle of 0 degrees. In addition, each molding member 5, 5
, Are sequentially fitted to the respective sides of the through hole 4, but only the last molding member 5 has a bifurcated portion (see reference numeral Z in FIG. 2) of one end portion expanded to open the other molding member 5. It is necessary to push it down as shown by the chain double-dashed line in Fig. 1 while sandwiching it.

Thus, the four corners of the through hole 4 have L
The mold joint space 6 is cut out, and an L-shaped joint plate 7 made of a synthetic resin is fitted into the joint space 6. Therefore, when the molding member 5 is fitted to the edge of the through hole 4 in the above manner, the joint plate 7 corresponds to the abutting portion of the molding members 5. And in FIG.
When the circular regions Y around the abutting portions of the molding members 5 and 5 are heat-welded, the two molding members 5 and 5 and the joint plate 7 are integrated, and the molding member 5 and the molding member 5 are interposed therebetween. 5 are rigidly joined together. When all the corners are heat-welded in this manner, all the molding members 5, 5 ... Are rigidly joined together to form a square frame. Since the molding members 5, 5, ..., Which have become one frame, have extremely high strength against a force in any direction, the strength of the corrugated board 1 is sufficiently reduced due to the provision of the window holes 3. You can make up for it.

Needless to say, the shapes of the joint space 6 and the joint plate 7 are not limited to the L-shape. For example, as shown in FIG. 4, the joint space 6 has a circular shape and is provided in the vicinity of the corner portion, and the joint plate 7 also has a circular shape and is fitted into the joint space 6.
As described above, the joint space 6 may be formed in a triangular shape and provided in the vicinity of the corner portion, and the joint plate 7 may be formed in a triangular shape so that the joint space 6 can be fitted into the joint space 6. Further, the portion to be heat-welded is the two molding members 5 as shown by the region Y in FIG.
When the position is such that the abutting portions of the two are centered, there is an advantage that the two molding members 5 and 5 and the joint plate 7 can be joined at the same time in one step, but it is not necessary to do so. The cardboard 1 is made of plastic,
It may be made of paper.

[0011]

EXAMPLE FIGS. 6 to 10 show a foldable box using cardboard. FIG. 6 is a perspective view of the box, FIG. 7 is a perspective view of the box in a folded state, and FIG. 8 is a perspective view of a bottom plate. FIG. 9 is an exploded perspective view of a side plate on the rotating side, and FIG. 10 is an exploded perspective view of a side plate having a folding screen folding structure.

The box 8 has a rectangular bottom plate 9 in plan view, two rotatable side plates 10 and 10 located on two opposite sides of the bottom plate 9, and the remaining two sides of the bottom plate 9. It is composed of two side plates 11 and 11 having a folding screen structure, a molding member 12 that covers the ends of the side plates 10 and 11, and a corner member 13 that connects the side plates 10 and 11 to each other.

The corrugated board forming the bottom plate 9 and the side plates 10 and 11 is made of the same plastic as described above. The bottom plate 9 is
As shown in FIG. 8, fixed vertical plates 14 are formed at both ends in a direction orthogonal to the corrugated fiber core member 2c. The vertical plate 14 is obtained by thermally deforming the both ends of the bottom plate 9 at a right angle, and has an elongated hole-shaped engaging portion 15.

The side plate 10 has a core member 2 as shown in FIG.
c is used in a vertical direction, a bending piece 13 is folded and stacked on the upper end with one substrate 2a as a hinge portion, and a molding member made of a synthetic resin and having a U-shaped cross section is formed on the upper end edge. 12 is fitted. A notch recess 17 is formed in the center of the portion where the two bent pieces 13 are stacked, and the handle member 18 is fitted into the notch recess 17. In addition, an inner folding curve 19a is formed by cutting the substrate 2b, leaving one substrate, at the upper end of the side plate 10 along the lower edge of the molding member 12, and the remaining substrate 2b serves as a hinge portion. 10 rotates toward the inside of the box 8. On the other hand, at the lower edge of the side plate 10, the reinforcing band 2 is provided in a direction orthogonal to the core member 2c.
0 is provided. The reinforcing band 20 of this embodiment has its lower end bent substantially at a right angle by the same method as the vertical plate 14 of the bottom plate 9. Further, the reinforcing band 20 has a projecting piece-like inward claw piece 21 that engages with the engaging portion 15 of the vertical plate 14 of the bottom plate 9.
Are formed.

As shown in FIG. 9, the side plate 10 has the window hole 3 having the above-described structure. Normally, if a large through hole 4 as shown in FIG. 9 is formed in the side plate 10, the strength is remarkably reduced. Especially, the box 8 having the folding structure as in this embodiment is used.
Has a structure in which the load is supported by the side plate 10 on the rotating side, and thus the reduction in the strength of the side plate 10 is fatal. However, if the window hole structure of the present invention is adopted, the four molding members 5 are tightly connected to each other by heat welding and surround the through hole 4, so that the strength of the side plate 10 is hardly reduced. The window hole 3 is used as a take-out port for the product placed inside, and may be provided only on one side plate 10.
Of course, it is free to provide the window holes 3 in both side plates 10, 10.

Next, the side plate 11 of the folding screen structure is shown in FIG.
As shown in FIG. 3, the corrugated board is used with the core member 2c oriented in the vertical direction, and the two side plates 11 and 11 are integrally connected via the reinforcing plate 22 that overlaps the bottom plate 9. A molding member 12 is fitted on the upper edge of the side plate 11, and an inward folding curve 19b is formed along the outer lower edge of the molding member 12. The inward folding curve 19b is cut by leaving a single board 2b inside the corrugated board, and the remaining board 2b inside serves as a hinge portion. An inner folding curve 19c having the same configuration as the inner folding curve 19b is formed at the boundary between the side plate 11 and the reinforcing plate 22. Further, the side plate 11 is further formed with a horizontal outer folding curve 19d cut at the center of both inner folding curves 19b and 19c while leaving one outer substrate 2a. The side plate 11 configured as described above is connected to the bottom plate 9 by bonding the reinforcing plate 22 to the lower surface of the bottom plate 9. The side plates 10 are arranged on the two sides of the bottom plate 9 on which the vertical plates 14 are provided, and the corner members 13 are fitted into the abutting portions of the side plates 11 to secure the rivets, so that the uppermost inward folding curve is formed. It is integrally connected to the side plate 11 at a portion above 19a and 19b.

Next, a method of folding and assembling the box 8 will be described. First, in the state where the box 8 is flatly folded as shown in FIG. 7, the side plate 11 is folded in two, and the side plate 10 is folded on the side plate 11. Further, the claw piece 18 a of the handle member 18 is engaged with the engaging portion 15 of the bottom plate 9. In order to assemble the box 8 from this state to the state shown in FIG. 6, first, the handle member 18 of the box 8 is opened to the outside and lifted up. Then, the claw piece 1 of the handle member 18
8a disengages from the engaging portion 15 of the bottom plate 9, the bottom plate 9 lowers, and the side plate 11 extends. When the side plate 10 is erected in this state, the side edge of the side plate 10 is bent to the outer folding curve 19d of the side plate 11.
Then, the side plate 11 is locked in a straight state. Then, by inserting the inward claw piece 21 of the side plate 10 into the engaging portion 15 of the vertical plate 14 of the bottom plate 9, the box 8 is assembled as shown in FIG.

In this assembled state, since the inward claw piece 21 of the side plate 10 is engaged with the engaging portion 15 of the vertical plate 14, the side plate 10 suspends and supports a part of the load applied to the bottom plate 9. , It doesn't break even if you put heavy luggage in the box 8 and lift it.
Further, as is well known, the corrugated cardboard exhibits excellent strength in the force acting in the direction parallel to the core member 2c, so that the boxes 8 containing heavy loads can be stacked in multiple stages. Furthermore, if the bottom plate 9 and the core members 2c of the reinforcing plate 22 are stacked so as to be orthogonal to each other as in this embodiment, the strength of the box bottom is also satisfactory.

Next, when folding from the assembled state to the flat state, first, the side plate 10 is rotated inside the box 8. Then, the side plate 11 having the folding screen folding structure is released from the lock and naturally bends from each of the inner folding (outer folding) folding curves 19b to 19d, so if it is pressed as it is, it can be folded into a flat state as shown in FIG. Then, when the molding member 12 of the side plate 11 is pushed further in from above, the claw piece 18a of the handle member 18 fits into the engaging portion 15 of the vertical plate 14 of the bottom plate 9 and becomes stable.

The window structure of the corrugated board of the present invention can be applied to a simple box which is not a folding structure, and when a corrugated board is used as a room partition, other than the corrugated board box having the folding structure described above.

[0021]

As described above, in the corrugated cardboard window hole structure of the present invention, the molding member mounted in the window hole is rigidly joined through the joint plate, so that the strength of the window hole portion is dramatically increased. You can In particular, if the window hole structure of the present invention is adopted for a corrugated cardboard box, it is possible to compensate for the decrease in strength of the side plate due to the provision of the window hole, so that the window hole can be maximized to facilitate the taking out of the product. It has the unique effect of being able to.

[Brief description of drawings]

FIG. 1 is a front view showing a corrugated board in a half section.

FIG. 2 is an exploded perspective view showing a window hole structure.

FIG. 3 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional front view showing a main part.

FIG. 5 is a sectional front view showing a main part.

FIG. 6 is a perspective view of a box.

FIG. 7 is a perspective view of the box showing a folded state.

FIG. 8 is a perspective view of a bottom plate.

FIG. 9 is an exploded perspective view of a side plate on a rotating side.

FIG. 10 is an exploded perspective view of a side plate having a folding screen structure.

[Explanation of symbols]

 1 ... Corrugated board 3 ... Window hole 4 ... Through hole 5 ... Mold member 6 ... Joint space 7 ... Joint plate 8 ... Corrugated board box 10 ... Side plate

Claims (2)

[Claims] 1. A corrugated cardboard is provided with polygonal through holes, and synthetic resin molding members each having a U-shaped cross section are attached to respective sides of the through holes, and end portions of the molding members adjacent to each other. In a corrugated cardboard window hole structure, a notched or hole-shaped joint space is formed at a corner portion of the through hole or in the vicinity thereof to correspond to a butted portion of the molding members, and this joint is formed. A corrugated cardboard window characterized in that a joint plate made of synthetic resin is fitted into the space, the joint plate and the molding member are heat-welded, and all the molding members are rigidly joined in a frame shape through the joint plates. Construction. 2. A corrugated cardboard box having at least one side plate formed with a window hole as follows. A polygonal through-hole is formed, and a molding member made of synthetic resin having a U-shaped cross section is attached to each side of the through-hole, and the ends of adjacent molding members are abutted to each other. A notched or hole-shaped joint space is formed at the corner of the through hole or in the vicinity thereof so as to correspond to the abutting portion of the molding members. A joint plate made of synthetic resin is fitted into the joint space, the joint plate and the molding member are heat-welded, and all the molding members are rigidly joined in a frame shape through the joint plates.