JPH08276957A - Bag-in-box - Google Patents

Abstract

PURPOSE: To make putting a bag into a box easy with air inside the box exhausted certainly, and to prevent bulging from occurring to the box body when the boxes are stacked in tiers. CONSTITUTION: In a bag-in-box made up of a paper box made of corrugated board or the like with reinforcing parts extending in the direction of height of the box provided at the inside of four corners thereof and a flexible bag filled with fluid matters such as liquid inserted therein, air vents 13 are provided at the lower parts of the laterals of the box, or at the lower parts of the reinforcing parts.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention is used for transporting, storing, or selling liquids, powders, or fluid articles such as viscous materials such as bean paste, lard, and margarine. Bag-in-box.

[0002]

2. Description of the Related Art As one of large-sized liquid transport containers mainly used for business, an outer box made of corrugated cardboard and a thin soft plastic bag for filling contents are used. A composite packaging container having the following structure is known (FIG. 1). This container is generally a "bag-in-box"
It is called.

When packaging a liquid product or the like in such a bag-in-box for shipping, the cardboard outer box 20 is automatically made by a box making machine separately from the bag 21, and the plastic bag 21 is After the bag is filled and sealed, it is generally inserted from the top of the cardboard outer box 20 to fit the box and the bag and shipped.

As the bag 21, a flexible bag made of a soft plastic material such as polyethylene, polypropylene or PET film is used. Since the shape of this bag conforms to the inner surface of the box and is freely deformed after being filled with liquid, a bag equal to the inner diameter of the box or larger than the inner diameter of the box is often used.

[0005]

However, in the above-mentioned conventional one, when inserting the bag 21 filled with the contents into the outer box 20, the following problems occur. That is, when the bag is inserted, the air inside the box cannot be removed, and the air remaining inside the box interferes and the bag stops at the entrance or the middle of the box, and the bag cannot be inserted to the bottom. The reason why the air cannot be removed is that when the bag is inserted into the cardboard box, the bag blocks the opening surface of the box like a plug, so that the air cannot escape from the opening surface. Therefore, it was necessary to deal with it by increasing the size of the outer box. However, if the size of the outer box is increased, a wasteful space volume other than the product is generated in the lower part or the upper part of the bag, which is not preferable for transportation, storage, or sales.

Further, the conventional bag-in-box has the following problems at the distribution stage, and the solution thereof is currently awaited. That is, the side of the outer box buckles during stacking storage, which causes the product to collapse and the product value to fall, or the internal pressure generated by the liquid filled in the bag (the pressure caused by the vibration and swing during transportation). It is known that fluctuation) acts on the wall surface of the outer box and the wall surface bulges outward (bulging). Therefore, it was necessary to increase the strength of the box material to strengthen the wall surface, or to reduce the number of loading stages of the box during storage and transportation to prevent the collapse of the load.

An object of the present invention is to solve the problems peculiar to the bag-in-box as described above. When the bag is inserted, the air inside the box is surely removed to facilitate the insertion of the bag. It is an object of the present invention to provide a bag-in-box that can prevent the body from bulging when stacked.

[0008]

In order to solve the above-mentioned problems, the present invention provides a columnar reinforcing portion extending in the height direction of the box on the inner surface of the four corners of a paper or corrugated box, and the inside of the box. A bag-in-box in which a flexible bag body filled with a fluid article such as a liquid is inserted, and one or more air vent holes are provided in a lower portion of a box side wall or a lower portion of the reinforcing portion. .

The outer box used in the present invention is made of one cardboard. That is, a box body is formed by extending two sets of side walls corresponding to each other in a cross shape with a rectangular bottom plate as a center, and a lid piece is provided on each upper edge of the two sets of side walls, and the corresponding sides are provided. Reinforcing pieces are extended on both sides of the side wall of any one of the two side plates, and the columnar reinforcing portion is formed inside the box body by these reinforcing pieces, and the columnar reinforcing portion is formed on the inner surface of the box body. It is constructed by bonding together. Then, an air vent hole is provided in the lower part of the side wall of the box thus constructed or in the lower part of the reinforcing part.

As the reinforcing portion, for example, an octagonal inner cylinder is formed inside the outer box, or the cross section of the four corners is formed into a triangle shape (triangle) or a right angle shape (right angle double fold). The existing one is used.

It is difficult for dust and the like to enter the air vent hole from the outside,
In addition, one or more will be opened at the bottom of the side wall of the box or at the bottom of the reinforcement to prevent deterioration of the strength of the box. For example, the air vent hole is preferably formed near the lower side of the hypotenuse surface of the columnar reinforcing portion having a substantially triangular cross section. Incidentally, the shape and size of the holes are arbitrary, and can be circular, semicircular, elliptical, triangular, quadrangular, etc., but may be simple slits. In the case of a box using corrugated board, the effect of the present invention can be obtained even if the air vent holes are formed only in one side liner layer of the corrugated board or only in one side liner layer and the core.

[0012]

In the bag-in-box having the above structure, an octagonal inner cylinder is formed inside the outer box, or the four corners have a triangular (trigonal) or right-angled (right-angled double fold) cross section. Since the columnar reinforcing portion is formed, it is possible to prevent the body from bulging on the wall surface, and since the air vent hole is provided in the lower side wall or the lower portion of the columnar reinforcing portion, insert the bag into the outer box. At this time, even if the bag closes the top surface of the box like a stopper, the air in the box easily escapes from the air vent holes. Therefore, the bag inserted in the outer box does not stop at the entrance of the box and easily sinks until it reaches the bottom. Immediately after the bag is inserted, the top surface of the outer box can be sealed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 3 is a perspective view showing an example of a box body used as an outer box of the bag inbox of the present invention,
The top is open and the bottom is shown. FIG. 4 is a perspective view showing a state where the inner bag is inserted into the outer box, and FIG. 5 is a developed view of the box body.

In the developed view, reference numeral 1 is a rectangular bottom plate formed by using one corrugated cardboard, 2 and 2 are a pair of left and right side walls, which are connected to the left and right around the bottom plate 1 through folding lines, Reference numeral 3 denotes a pair of front and rear side walls, which are continuously provided around the bottom plate 1 via folding lines. Front and back side walls 3, 3
Is wider than the left and right side walls 2, 2. Further, on the extension of the two sets of side walls 2, 2, 3 and 3, inner flaps 4 and 4 and outer flaps 5, which are lid pieces when assembled and used, are provided.
5 are arranged in a row. Hand holes 6 used for disassembling are formed in the inner flaps 4, 4 on both sides. Further, a take-out port 7 for the bag pouring port is formed on one of the outer flaps.

As shown in FIG. 5, reinforcing side flaps 12, 12 having a total length S of the side wall 2 and the inner flap 4 are formed on both left and right extensions of the front and rear side walls 3, 3. Four reinforcing pieces 8 to 11 are partitioned and formed on the side flap 12 through parallel folding lines. An air vent hole 13 having a triangular shape, for example, is provided on the lower side of the reinforcing piece 10. By the way, the reinforcing pieces 8 to 11 are used by bending the four corners of the box body (outer box) to be assembled into a square shape into a substantially triangular shape (triangle shape) with the side wall of the box body as one side. The reinforcing pieces 8 are formed to have a half width of the side wall width L so as to be butt-joined to each other inside the side wall 2.

The outer box of the present invention having the above structure is assembled and used by hand or machine as follows.
First, the right and left side-by-side front and rear side walls 2, 2 and 3, 3 are erected at right angles to the bottom plate 1, and the reinforcing piece 8 adjacent to the side wall 3
Are superposed on the inner surface of the side wall 2 and fixed integrally. The reinforcing piece 11 is superposed on the inner surface of the wide side wall 3 and fixed integrally. In this case, inside the side wall 2, the end surfaces of the adjacent reinforcing pieces 8 and 8 are butt-joined to each other, and inside the side wall 3 the end surfaces of the adjacent reinforcing pieces 11 and 11 are butt-joined to each other. .

FIG. 3 is a completed drawing of the outer box, in which a substantially octagonal inner cylindrical portion is formed inside the outer box, and the side wall is formed inside the corner formed by the side walls 2 and 3. The columnar reinforcing portion is formed by bending into a substantially triangular shape (triangle shape). The triangular air vent hole 13 having a side length of 3 mm is provided below the hypotenuse surface 10 of the reinforcing portion.

A flexible bag 21 formed of a PET film, a soft plastic film such as polyethylene, or a laminated film mainly containing these is inserted into the outer box as an example in which the contents are filled. When inserting this bag, conventionally, there was a problem that the air inside the box could not be extracted and the air remaining inside the box interferes with the insertion and the bag stops at the box entrance and does not easily fall to the bottom. there were.

In this embodiment, since the triangular air vent hole 13 is provided in the lower portion of the hypotenuse surface of the columnar reinforcing portion, when the bag 21 is inserted inside the octagonal inner cylinder portion, The air in the box easily escapes from the lower part of the hypotenuse surface of the columnar reinforcing part to the inside of the reinforcing part. Therefore, even if the bag is equal to the inner diameter of the inner cylinder or is larger than the inner diameter of the inner cylinder, it will fit on the inner surface of the box and smoothly deform while falling to the bottom of the box. Easily inserted into. FIG. 4 shows a state in which a bag 21 filled with contents is accommodated in the bottom of the outer box 20 of the bag-in-box according to the present invention.

In the above embodiment, the air vent hole 1
3 are provided at the positions in contact with the lower side of the hypotenuse surface 10 of the columnar reinforcing portion located at the four corners of the box, respectively, but it is not necessary to provide them at all four locations, and one location may be provided.

Although the air vent hole 13 can be provided so as to penetrate the side walls 2, 2, 3, and 3, it may be provided near the lower side of the hypotenuse surface 10 of the columnar reinforcing portion as in the above embodiment. It is preferable in that the strength does not decrease easily, holes are easily opened, and dust does not enter the box from the outside.

In the case of a cardboard box, the air vent hole 13 does not need to be provided so as to penetrate the corrugated cardboard sheet. For example, only the inner liner layer 31 or the inner liner layer 31 and the core 32 may be provided with an air vent hole. 13 may be provided. In this case, as is clear from FIGS. 5 and 6, since the flutes of the corrugated board are positioned vertically (vertical eyelets), the air inside the box can be easily passed through the flutes of the corrugated board through the holes formed in the liner layer or the core. Can be removed.

The shape and size of the air vent hole 13 are arbitrary as described above, and may be circular, semicircular, elliptical, triangular, quadrangular, or the like, or may be a simple slit (break).

The corrugated cardboard outer box is not limited to the one in which a substantially octagonal inner cylinder portion is formed on the inner surface of the outer box as in the above embodiment. For example, as shown in (A1) and (A2) of FIG. 7, a columnar reinforcing portion 23 is formed by bending the side walls 2 and 3 into a substantially triangular shape (triangle shape) having one side as a side, Alternatively, as shown in (B1) and (B2) of FIG. 7, it may be an outer box having a right-angled shape (right-angled double fold) and provided with a columnar reinforcing portion 24. However, in FIG.
As in 1) and (A2), the three-sided cylinders at the four corners of the box are used as air vents, but the strength is less reduced and dust does not enter from the outside.

[0025]

Since the present invention has the above-mentioned structure, the air in the box can be surely removed when the bag is inserted, and the bag can be smoothly inserted to the bottom of the box. Therefore, the top surface of the outer box can be sealed immediately after the bag is inserted. In addition, the space volume other than the bag does not become larger than necessary for product packaging, and the box design size can be reduced,
It has a remarkable effect as a bag-in-box because it can prevent the body from bulging when stacked.

[Brief description of drawings]

FIG. 1 is an exploded view showing an example of a bag in box.

FIG. 2 is a vertical sectional side view of the assembly of FIG.

FIG. 3 is a perspective view showing an example of a box main body used as an outer box of the bag-in-box according to the present invention, showing the bottom with the top surface open.

FIG. 4 is a perspective view showing a state in which an inner bag is inserted into an outer box.

FIG. 5 is a development view of the box body.

FIG. 6 is an explanatory diagram showing positions of air vent holes formed in a corrugated board.

FIG. 7 shows another example of the box body used as the outer box of the bag-in-box according to the present invention, and includes (A) 1 and (A) in FIG.
2) is a triangle shape on the inner surface of the four corners of the box.
7A and 7B are a plan view and a perspective view in which the columnar reinforcing portion having the shape of FIG.
(B) 1 and (B 2) are a plan view and a perspective view in which a right-angled (right-angled double-folded) columnar reinforcing portion is provided, and the positions of the air vent holes are also shown.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bottom plate 2, 3 Side wall 4 Inner flap 5 Outer flap 8-11 Reinforcing piece 13 Air vent hole 20 Outer box 21 Inner bag 23, 24 Reinforcing portion 31 Corrugated cardboard inner liner 32 Center core

Claims (6)

[Claims] 1. A flexible bag body filled with a fluid article such as a liquid is inserted into the inside of the four corners of a box made of paper such as a corrugated cardboard, the reinforcing section extending in the box height direction. In the bag-in-box as described above, an air vent hole is provided in the lower part of the side wall of the box or the lower part of the reinforcing part. 2. The box is made of a piece of corrugated cardboard, and has a rectangular bottom plate defined in the center as a center, and two sets of side walls corresponding to the four sides thereof are extended. A box body is formed, and a lid piece is provided on each upper edge of the two sets of side walls, and one of the two sets of corresponding side walls is provided.
Four reinforcing pieces are extended on both sides of the side wall of the set, and a columnar reinforcing portion is formed inside the box body through a ruled line provided between the reinforcing pieces, and the columnar reinforcing portion is connected to the box. The bag-in-box according to claim 1, which is adhered to the inner surface of the main body. 3. The bag-in-box according to claim 1, wherein the reinforcing portion has a triangular shape (triangular shape) or a right angle shape (double-folded right angle) in cross section. 4. The bag-in-box according to claim 1, wherein an air vent hole is formed in a hypotenuse portion of the columnar reinforcing portion having a substantially triangular cross section. 5. The bag-in-box according to claim 1, wherein a box made of corrugated board is provided with an air vent hole in the liner layer of the corrugated board or in the liner layer and the core. 6. The bag-in-box according to claim 1, wherein the air vent hole is a slit portion penetrating the paper layer.