JPH1149138A - Tray made of corrugated board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tray made of corrugated board, which can be built up from one sheet of corrugated board into a box-shape being excellent in strength and cushioning property, and is suitable for the packing of articles with weight such as fruit and vegetables. SOLUTION: For a corrugated board 101, to the four edges of a rectangular bottom surface 1, wall surfaces 2 are respectively connected, and between confronted side ends of the wall surfaces 2, 2 which are orthogonally adjacent, a four-corner connecting piece 3 where a diagonal folding line B for double folding is provided, is provided in a manner to stride with folding lines, and to at least one of the confronted wall surfaces 2, 2, an internal wall surface 4 to form a double wall, is connected, and at the same time, to the side end, a corner part reinforcing piece 9 is connected, and to either one of the confronted wall surfaces 2, 2, a top surface piece 11 for reinforcing and tray stacking as well, is connected, and also, an insertion piece 12 is connected to the side end, and on a top surface (a), an insertion hole for the insertion piece 12 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has excellent structural strength and cushioning properties and is easy to use.
The present invention relates to a foldable corrugated cardboard tray suitable for packing fruits and vegetables such as tomato and "Tomato".

[0002]

2. Description of the Related Art There has been known a technique in which a simple packaging box having a double-walled peripheral wall can be folded up simply by folding one sheet of paperboard having folds or cuts at predetermined locations. The above-mentioned paperboard has a form in which four side walls provided with folds that fold inward toward the inside of the box are provided on four sides of a square bottom piece. At one side end of each of the pair of side wall pieces adjacent to each other at right angles, an insertion piece to be inserted and fitted into the double wall gap at the other side end is continuously provided.

[0003]

The above-mentioned conventional packaging box has a good appearance for packaging relatively light items such as a set of assorted foods for gifts, for example. The box can be quickly folded up, folded flat, and easily stored, making full use of its features.

[0004] However, in this conventional packaging box, the orthogonally adjacent side wall pieces are not completely connected to each other, and the insertion piece at one side end is simply inserted into the double wall gap at the other side end. Since it is only inserted, it may be treated crudely at the flow stage, for example, to use it as a packing box for heavy goods such as fruits and vegetables such as `` Kiyuri '' and `` Tomato '' etc. , Lacks in strength.

Accordingly, an object of the present invention is to fold a single corrugated cardboard into a tray shape having a double wall structure and excellent cushioning properties, and to withstand rough handling in the distribution stage.
For example, it is an object of the present invention to provide a cardboard tray suitable for packing heavy items such as fruits and vegetables.

[0006]

In order to achieve the above object, a corrugated cardboard tray according to the present invention is obtained by folding a substantially square corrugated cardboard into a tray shape.
The corrugated cardboard 101 is provided on four sides of a square bottom surface 1 with wall surfaces 2.
Are connected to each other via folds, and four corner connecting pieces 3 provided with two oblique folds B are laid across the folds between opposing ends of the wall surfaces 2 and 2 which are orthogonally adjacent to each other. An inner wall surface 4 for forming a double wall is connected to one of the opposing wall surfaces 2 and 2 through folds, and a corner reinforcing piece 9 is connected to a side end thereof. , A top piece 11 for reinforcing and stacking trays is connected to each other, and a plug piece 12 is connected to a side end thereof. Is provided with an insertion hole b for inserting the hole. And
At the lower end of the inner wall surface 4 is provided a locking projection 10, and on the bottom surface 1,
It is preferable to provide an insertion hole 7 into which the locking projection 10 is inserted.
Further, a cut-and-raised cut 6 for forming the protruding piece 5 in a cut-and-raised form is provided on the top surface a of the double wall, and an insertion hole 7 for inserting the protruding piece 5 is preferably provided on the bottom surface 1. Or another cardboard 102
As a form of (103), wall surfaces 2 are continuously provided on four sides of a square bottom surface 1 via folds, and a diagonal fold for two folds is provided between opposing ends of the orthogonally adjacent wall surfaces 2 and 2. The four corner connecting pieces 3 provided with B are laid over the folds, and the inner wall surfaces 4 forming the double wall are continuously provided on the four wall surfaces 2 via the folds, respectively. The wall surfaces 4 and 4 are provided with a cut 16 having a shape similar to an arc for forming the corner top surface piece 14, and an insertion piece 17 is continuously provided at the side end thereof.
The top surface a of the double wall may be provided with an insertion hole b into which the insertion piece 17 is inserted. Further, an inner bottom surface 19 to be superimposed on the bottom surface 1 may be continuously provided on the inner wall surface 4 via a fold, and a corner reinforcing piece 20 may be continuously provided at a side end of the inner bottom surface 19. In addition, it is preferable to provide a notch c for a handle which serves as a handle hole or a vent when the trays are stacked on the upper edge of the double wall.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is applied to a shipping tray for fruits and vegetables such as "Kiyuri" will be described below with reference to FIGS. A cardboard tray (hereinafter, simply referred to as a tray) A1 of this embodiment shown in FIG. 7 is obtained from the single cardboard 101 shown in FIGS. 1 and 2 according to the procedure shown in FIGS. Simple·
Folds up quickly.

The corrugated cardboard 101 is provided with many folds and cuts, and its specific form will be described in detail below. The substantially rectangular corrugated cardboard 101 has a rectangular area occupying the center portion as the bottom surface 1 of the tray A1.
On four sides of the bottom surface 1, a wall surface 2 serving as a peripheral wall of the tray is provided.
Each is continuously connected via a fold line A.

A substantially quadrangular four-corner connecting piece 3 provided with a diagonal fold B for two folds is provided between the opposing side ends of each pair of wall surfaces 2 and 2 which are orthogonally adjacent to each other via a fold C. It is straddling. The oblique fold B and the fold C are placed with the outward and inward folds of the tray A1.

[0010] Of the pair of wall surfaces 2, 2 positioned opposite each other, a double wall is formed on the vertical wall surfaces 2, 2 (hereinafter the same in FIG. 1). Inner wall 4
Are continuously provided via a fold line D. The fold D is composed of two folds provided in parallel at some intervals, and the portion between the folds is doubled with the tray A1 folded up as shown in FIG. It becomes the top surface a of the wall.

[0011] Each top surface a is provided at two places near both ends thereof.
A U-shaped cut-and-raised cut 6 for forming the protruding piece 5 into a cut-and-raised shape is provided, and this portion lacks the fold D. On the other hand, in the bottom surface 1, when the trays A 1 are stacked, the insertion holes 7 for inserting the protruding pieces 5 protruding on the top surface a of the lower tray are provided at positions corresponding to the respective protruding pieces 5. Provided. The protruding piece 5 is left behind when the fold D is bent, and is in a state of standing upright on the top surface a.
The insertion hole b is generated as shown in FIG.

Further, a protruding piece 8 is connected to the upper edge of each of the four corner connecting pieces 3. As shown in FIG. 7, when the tray A <b> 1 is folded up, the protruding piece 8 projects through the insertion hole b onto the top surface a, and is in a state of being overlapped with the protruding piece 5.

Corner reinforcing pieces 9 are continuously provided on both side ends of each inner wall surface 4 with folds F therebetween. The corner reinforcing piece 9 may be made larger as shown by a virtual line in the upper left of FIG. 1 to increase its function. In addition, each inner wall surface 4 has a lower edge near both ends in a state of being folded on the wall surface 2.
The locking projections 10 are continuously provided at a total of three locations, that is, a location and a middle portion. Each locking projection 10 can be inserted into the above-described insertion hole 7 provided on the bottom surface 1 and also serves as an insertion hole for the projection pieces 5 and 8.

Further, in FIG.
The top piece 11 of the same width as the height of the wall 2
They are connected via a fold G. At both ends of the top surface piece 11, insertion pieces 12 are continuously provided via fold lines H.
Further, the top piece 11 is provided with a notch 13 for facilitating the taking in and out of the article into the tray A1.

Next, a procedure for folding up the tray A1 from the cardboard 101 will be described. First, as shown in FIG. 3, the left and right wall surfaces 2 are once folded inward along the fold A once.

Then, as shown in FIG. 4, when these two wall surfaces 2 and 2 are raised, each of the four corner connecting pieces 3 is folded in two from the direction of the skew of the oblique fold B and the fold C. Meanwhile, both the upper and lower wall surfaces 2 and 2 in FIG. 1 are erected by themselves so as to be entrained.

Then, as shown in FIGS. 5 and 6, each of the wall surfaces 2 is completely erected, and first, a pair of inner wall surfaces 4,
4 is folded inside the wall surface 2 to form a double wall while bending the corner reinforcing pieces 9 at each side end inward at right angles. At this time, the locking projections 10 at the lower end of the inner wall surface 4 are fitted into the corresponding insertion holes 7 provided on the bottom surface 1 respectively, and the above-mentioned folded state is fixed. Also, as described above, each protruding piece 5
Protrudes from the top surface a by itself, and an insertion hole b is formed.

Finally, as shown in FIG.
When each of the inserts 1 and 11 is bent inward and horizontally while each insert 12 at the side end thereof is bent downward, each insert 12 corresponds to the top surface a of the double wall. The tray A1 is easily and quickly completed by being inserted into the respective insertion holes b, and the folded shape is securely fixed. If necessary, the four corner connecting pieces 3 may be fixed in the folded state by an adhesive or a stopper.

The top piece 11 not only increases the structural strength of the tray A1, but also cooperates with the protruding pieces 5, 8 and the insertion holes 7 thereof to easily stably stack a large number of trays A1. It plays the role of doing. The four corner connection pieces 3 and the corner reinforcing pieces 9 sufficiently increase the pressure resistance of the tray A1 and the connection strength of the four corners.

Next, FIGS. 8 to 14 show a tray A2 according to a second embodiment. This tray A2, which is folded from one piece of corrugated cardboard 102 shown in FIGS. 8 and 9 into the form shown in FIG. 14, is different from the tray A1 of the first embodiment in that all of the four wall surfaces 2 are two. It has a heavy wall. Also, the top piece 11
Is different from the first embodiment in that the corner top surface pieces 14 are formed at both end portions of the left and right inner wall surfaces 4 instead.

That is, instead of the top surface piece 11, the inner wall surface 4 is continuously provided on the left and right wall surfaces 2 and 2, respectively. The corner reinforcing pieces 9 on both sides of the inner wall surface 4 in the vertical direction are connected to the upper edge of the folded-up tray through the fold I on the upper edge of the tray when the tray is folded up. Has been established. Further, arc-shaped cuts 16 having a radius shorter than the height dimension of the inner wall surface 4 are provided at the respective side end portions of the inner wall surfaces 4 and 4 in the left-right direction so as to straddle the side end and the fold D. ing.

As a result, when the inner wall surface 4 is folded on the wall surface 2, the corner top surface piece 14 formed by being surrounded by the cut 16 and the fold D is left unfolded (FIG. 13). reference). At the side end of the corner top surface piece 14,
Are continuously provided via a fold line H. The shape of the cut 16 is not limited to an arc shape, but may be a straight line or the like.

At the center of the fold D, which bends the inner wall surfaces 4, 4 in the left-right direction, a hollow 18 is formed so as to straddle both sides of the fold.
Is provided. As can be understood from FIG. 14, this hollow hole 18 is provided with the notch c
Is formed. When the trays A2 are stacked, the notch c for cuffs serves as a couch for facilitating lifting of the upper tray, and also functions as a vent.

The procedure for folding up the tray A2 from the cardboard 102 is substantially the same as that for the tray A1. This procedure is shown in FIGS. As shown in FIGS. 10 and 11, when folding the inner wall surfaces 4, 4 in the vertical direction in FIG. 8 onto the wall surface 2, the overlapping pieces 15 are superimposed on the corner reinforcing pieces 9 on both side ends thereof. Thereby, the structural strength of the four corners of the tray A2 can be further increased.

Then, as shown in FIGS.
When the left and right inner wall surfaces 4 and 4 are folded on the wall surface 2, each of the four corner top surface pieces 14 left as described above is bent inward and horizontally, and each insertion piece at the side end thereof is bent. 17 is bent downward and inserted into each of the corresponding insertion holes b of the top surface a, and the tray A2 with the strength at the four corners further increased.

FIGS. 15 to 21 show a tray A3 according to a third embodiment. This tray A3, which is folded from one piece of corrugated cardboard 103 shown in FIGS. 15 and 16 into the form shown in FIG. 21, is different from the tray A2 of the second embodiment in that one set in the vertical direction in FIG. Bottom 1 on inner wall surfaces 4 and 4
The inner bottom surface 19 that reinforces is provided at each of the folds J. At both ends of the inner bottom surface 19, corner reinforcing pieces 20 are continuously provided via folds K. Reference numeral 21 denotes a notch for avoiding interference with the insertion hole 7 provided on the bottom surface 1.

The procedure for folding up the tray A3 from the cardboard 103 is as shown in FIGS. 17 to 21 and is the same as that for the tray A2, so that the description is omitted. As shown in FIG. 21, an inner bottom surface 19 is superimposed on the bottom surface 1 of the folded tray A3, and the load of the article applied to the inner bottom surface 19 is received by the corner reinforcing pieces 20 connected to both side ends thereof. The corner reinforcing pieces 20 further reinforce the four corners of the tray.

Accordingly, the structural strength of the entire tray A3 is remarkably increased, and sufficient durability is exhibited even when used as a returnable box. The inner bottom surface 19 may be appropriately increased or decreased in area according to the use of the tray, or may be provided continuously with all of the four inner wall surfaces 4.

[0029]

As is apparent from the above description, the cardboard tray of the present invention has excellent practical effects as listed below. (A) Compared with a conventional paperboard packaging box having a double-walled peripheral wall, the packaging strength is remarkably excellent and the cushioning property is also excellent. (B) Therefore, it is packed with fairly heavy items, such as fruits and vegetables, and can be used with sufficient reliability in uses that may be handled roughly at the distribution stage. (C) A large number of trays can be stably stacked. (D) After use, it can be easily and quickly deployed on a single, non-bulky cardboard box. (E) Design changes can be easily and freely made to obtain reasonable structural strength with no excess or deficiency for the purpose of use.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention, and is a plan view of a cardboard used as a material of a tray.

FIG. 2 is a perspective view of the same cardboard.

FIG. 3 is a perspective view showing a state where the tray has begun to be folded from a cardboard;

FIG. 4 is a perspective view showing a state in which each wall surface is being raised.

FIG. 5 is a perspective view showing a state in which each wall surface has been completely raised.

FIG. 6 is a perspective view showing a state where the double wall is folded up.

FIG. 7 is a perspective view of the folded tray.

FIG. 8 shows a second embodiment of the present invention, and is a plan view of cardboard as a material.

FIG. 9 is a perspective view of the same cardboard.

FIG. 10 is a perspective view showing a state where the respective wall surfaces are erected.

FIG. 11 is a perspective view showing a state in which the polymer piece is bent as in the first embodiment.

FIG. 12 is a perspective view showing a state where one of the opposed double walls is folded up.

FIG. 13 is a perspective view showing a state where the other opposing double wall is also folded up.

FIG. 14 is a perspective view of the tray that has been folded.

FIG. 15 shows the third embodiment of the present invention and is a plan view of cardboard as a material.

FIG. 16 is a perspective view of the same cardboard.

FIG. 17 is a perspective view showing a state where the tray has begun to be folded.

FIG. 18 is a perspective view showing a state where the respective wall surfaces are raised.

FIG. 19 is a perspective view showing a state where one of the opposed double walls is folded up.

FIG. 20 is a perspective view showing a state where the other opposed double wall is also folded up.

FIG. 21 is a perspective view of the tray that has been folded.

[Explanation of symbols]

 A1 to A3 trays 101 to 103 Corrugated cardboard 1 bottom surface 2 wall surfaces 3 corner connection pieces 4 inner wall surfaces 5 projections 6 cut-and-raise cuts 7 insertion holes 8 projections 9 corner reinforcement pieces 10 locking projections 11 top surface pieces 12 insertion Piece 13 cutout part 14 corner top piece 15 overlap piece 16 cut 17 insertion piece 18 hollowing hole 19 inner bottom face 20 corner reinforcing piece 21 cutout part A fold B diagonal fold C-K fold a top surface b insertion hole

Claims (7)

[Claims] 1. A cardboard 101 which is folded up from a substantially square cardboard in the form of a tray, wherein the cardboard 101 has four side walls of a square bottom surface 1 and a wall surface 2 connected to each other via folds. A four-corner connecting piece 3 provided with a two-fold oblique fold B is laid across the fold between opposing ends of the orthogonally adjacent wall surfaces 2, 2. The inner wall surfaces 4 forming the double wall are connected to each other via folds, and the corner reinforcing pieces 9 are continuously provided at the side ends thereof. And the insertion piece 12 is provided on the side end thereof, and an insertion hole b for inserting the insertion piece 12 is provided on the top face a of the double wall. A corrugated cardboard tray characterized by having a configuration. 2. The locking projection 10 is provided at a lower end of the inner wall surface 4, and an insertion hole 7 into which the locking projection 10 is inserted is provided on the bottom surface 1. Cardboard tray. 3. A cut-and-raised cut 6 for forming the protruding piece 5 in a cut-and-raised form on the top surface a of the double wall, and an insertion hole 7 for inserting the protruding piece 5 on the bottom surface 1. The cardboard tray according to claim 1, wherein the tray is provided. 4. A cardboard 102 (103) which is folded up from a substantially square cardboard into a tray form, wherein the cardboard 102 (103) is formed on four sides of a square bottom 1 by folding a wall 2 respectively. A four-corner connecting piece 3 provided with two oblique folds B is provided between the opposite side ends of the wall surfaces 2 and 2 which are adjacent to each other at right angles via a fold. Has a pair of inner wall surfaces 4 that form a double wall, each of which is formed with a fold line. A pair of inner wall surfaces 4 and 4 have a shape similar to an arc for forming a corner top piece 14. A structure in which a cut 16 is provided, an insertion piece 17 is continuously provided at a side end thereof, and an insertion hole b for inserting the insertion piece 17 is provided on a top surface a of the double wall. A cardboard tray characterized by the following: 5. The corrugated cardboard tray according to claim 1, wherein an inner bottom surface 19 to be superimposed on the bottom surface 1 is connected to the inner wall surface 4 via a fold. 6. A corner reinforcing piece 2 is provided on a side end of the inner bottom surface 19.
The corrugated cardboard tray according to claim 5, wherein 0s are continuously provided. 7. A notch c for a handle, which serves as a handle hole or a ventilation hole when stacking trays, is provided at an upper edge portion of the double wall. A cardboard tray according to any of the above.