JP2579704B2 - Double container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double container comprising an outer container and an inner container, and can be used particularly for transporting and storing liquids, slurries, powders, granular solids and the like.

[0002]

2. Description of the Related Art Conventionally, as a container for transporting a liquid, a metal 18 liter can was generally used. However, in the case of a metal can, there is a problem that rust is generated in the can and the liquid is contaminated, or the liquid leaks due to a hole depending on the type of liquid to be carried. In addition, this metal can cannot be recycled and used because it is easily rusted, and can only be used as a one-way container.In other words, the container cannot be collected and reused. There is a problem that resource saving cannot be achieved because of disposal, and that the cost is high because a new can must be used for each use.

[0003] For this reason, in recent years, the use of plastic 20-liter industrial cans and flat cans, which can prevent rust and perforation from occurring and are lightweight after use, are easy to collect and can be recycled. became. However, when this plastic can is recycled and used, there is a problem that the inside of the can has to be cleaned, the operation is complicated, and the recycling cost is increased.

For this purpose, a back-in-box type container is used in which a bag-shaped inner container made of a plastic sheet is inserted into a plastic outer container, a liquid to be conveyed is put into the inner container, and a load is applied by the outer container. It has been proposed that the inner container can be taken out and discarded after transportation, and the outer container can be reused to recycle part of the container without performing cleaning work. See JP-A-2-191171).

[0005]

However, this conventional back-in-box type container has a problem that the bag-shaped inner container must be attached to and detached from the opening of the outer container, and the attaching and detaching work is difficult. .

Further, a double container comprising a synthetic resin inner container and a sheet-like outer casing, wherein the outer casing can be easily attached by a slide fastener (Japanese Utility Model Laid-Open No. 1-179523). However, only a thin sheet-shaped member can be used as the outer cover, and it cannot be applied when the outer container is robust. For this reason, in order to be able to carry and store it in a stacked manner, it is necessary to use a thick hollow solid container capable of withstanding a load as the inner container. Therefore, if the container is reused without washing, the outer casing can be reused, but the thick hollow inner container that requires a long molding time, high manufacturing cost, and a large amount of material must be discarded. However, there is a problem that resource saving cannot be achieved and recycling cost is high.

An object of the present invention is to provide a double container in which the inner container and the outer container can be easily attached and detached, and which can save resources and reduce recycling costs.

[0008]

A double container according to the present invention comprises an outer container and an inner container made of synthetic resin, wherein the outer container is formed to be openable and closable, and the inner container is attached to and detached from the outer container. Flange formed freely on the inner container when placed in the outer container
It is moved to the protruding portion formed in the opening of the outer container
To fit the outer container joint
And a lock mechanism for locking the outer container so that the outer container cannot be deployed by locking the outer container .

[0009]

According to the present invention, the outer container is unfolded, the inner container is disposed inside the outer container, and the outer container is closed to close the inner container .
The flange formed on the side container is formed at the opening of the outer container.
To the projected side of the outer container,
A double container is formed by locking the outer container non-deployable by a locking mechanism of the inner container that locks the seam with a flange . For this reason, it is not necessary to attach / detach the inner container from the opening of the outer container as in the related art, and the inner container is easily attached / detached by expanding the outer container.

Further, the outer container only needs to be configured to be openable and closable, and can have a robust structure having a thickness capable of supporting a load. Therefore, the inner container can be configured by an inexpensive thin container. For this reason, even if the inner container is discarded for recycling, the outer container, which has a high production cost and uses a large amount of material, can be reused without washing, so that recycling can be easily performed and resource saving can be achieved.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show a cross-sectional view and a perspective view of a double container 1 of the present embodiment. The double container 1 has a double structure including an outer container 2 and an inner container 3.

As shown in FIG. 3, the outer container 2 is configured to be openable and closable by two container constituent members 4 and a hinge 5 connecting the container constituent members 4. In this embodiment, the container component 4 has a melt index of 3 g / 10 min.
Block PP (polypropylene) by injection molding
40mm x 340mm x 10mm size and thickness 1.5 ~
It is used in the shape of a flat hexagon with a size of about 2.5 mm.

The hinge 5 is formed of PP, has a thin bent portion 5A at the center and penetrates a hole 4A formed in the container constituting member 4 as shown in FIGS. It has a pin portion 5B. As shown in FIG. 5, the hinge 5 is disposed across the two container constituent members 4, and the pin portion 5B is inserted into the hole 4A, and the distal end portion is heated to make a hemispherical shape. It is fixed to the container component 4. This hinge 5 allows the two container components 4
That is, the outer container 2 is configured to be openable and closable, and the hemispherical pin portion 5B of the hinge 5 forms the leg 6 of the double container 1.

As shown in FIGS. 2 and 3, the outer container 2 has windows 7A and 7B for viewing the inside, and a grip 8 for grasping by hand during transportation or the like.
Are formed. Also, windows 7 on both sides of the outer container 2
As shown in FIGS. 6 and 7, a fitting projection 9 is formed in one of the windows 7A of FIGS. 6A and 6B so as to fit into the other window 7B of the other container 2 when the containers 2 are stacked horizontally. The fitting projection 9 and the window 7B constitute a stacking structure that prevents the container 2 from shifting or dropping even when the outer container 2 is horizontally stacked.

On the other hand, the inner container 3 is formed by hollow molding LLDPE (ethylene-α-olefin copolymer) having a melt index of 2 g / 10 min and a density of 0.920.
It is of a size, shape and translucent that can be stored inside. The size of the inner container 3 is set depending on the amount of the liquid or the like to be stored, but is generally set at 4 to 40 liters, preferably 10 to 20 liters. The inner container 3 is formed to a thickness of about 0.5 to 1.5 mm,
As shown in FIG. 8, a bellows-like pleating process is applied to the side surface.

An outer diameter of 50 mm is provided on the side of the inner container 3.
The spout 10 is provided with a lock mechanism 11 for locking the outer container 2 so that it cannot be deployed. As shown in FIGS. 9 and 10, the lock mechanism 11 has a cylindrical flange 1 having an L-shaped cross section that can be fitted to a cylindrical projection 12 formed at the opening of the outer container 2.
3 is provided. The flange 13 is manufactured by injection molding using the same material as the inner container 3, and then is inserted and integrally formed when the inner container 3 is hollow-formed. After closing the outer container 2 with the flange 13 of the inner container 3 moved in the direction of the arrow as shown in FIG. 9, the flange 13 is moved in the direction of the arrow as shown in FIG. By joining, the joint of the outer container 2 is locked by the flange 13 and the outer container 2 cannot be deployed.

A cap 14 is screwed into the spout 10 to prevent the contents of the inner container 3 from leaking.

The operation of the embodiment having such a configuration will be described. First, the container constituent member 4 and the hinge 5 are respectively injection-molded and fixed, and the outer container 2 is manufactured.
After manufacturing the flange 13 by injection molding, the inner container 3
Insert and integrally mold when hollow molding the inner container 3
To manufacture.

Next, after deploying the outer container 2 and disposing the inner container 3 therein, the outer container 2 is closed and the lock mechanism 1 is closed.
1 to lock undeployable to form the double container 1. The liquid may be injected into the inner container 3 before the inner container 3 is placed in the outer container 2 or after the inner container 3 is placed and locked.

As shown in FIG. 11, the double container 1 can be gripped with a hand grip 8 as shown in FIG. 11, placed on a carrier such as a truck as shown in FIGS. It is transported by loading. At this time, when two or more containers 1 are stacked and transported, the fitting projection 9 is placed in the window 7B.
The lateral displacement is prevented by fitting into, so that the container 1 can be prevented from dropping.

When the double container 1 is transported and stored, it may be stored in a horizontal pile as shown in FIGS. 6 and 7, or may be stored in the legs 6 of the hinge 5 as shown in FIGS. You may keep it down. In particular, if the leg 6 is lowered, the spout 10 is arranged at the uppermost part, so that the contents of the inner container 3 are less likely to leak.

When the container 1 is tilted by grasping the grip 6 by hand as shown in FIG. 11, contents such as liquid are discharged from the container 1 through the spout 10.

Next, in order to recover the outer container 1 after discharging the liquid in the inner container 1 or to transport a large number of empty containers such as transporting the container 1 before assembling the double container 1, First, the outer container 2 is separated from the inner container 3 by removing the lock mechanism 10, unfolding the outer container 2, and taking out the inner container 3, for example.

Next, the outer containers 2 are stacked and transported in a developed state as shown in FIG. This outer container 2
Can be reused without washing because it does not touch the transported liquid. If only the inner container 3 is newly formed, the double container 1 can be recycled. On the other hand, the inner container 3 may be discarded on the spot, or the pleated portion may be folded and compressed for transportation as shown in FIG.

According to this embodiment having such a configuration, the following effects can be obtained. That is, since the outer container 2 is configured to be openable and closable, the inner container 3 can be easily attached to and detached from the outer container 2. Further, since the outer container 2 is locked so as not to be unfolded by the lock mechanism 11 provided at the spout 10 of the inner container 3, there is no need to prepare a member for locking the outer container 2 separately. Can also be easily performed. For this reason, the inner container 3 can be easily attached and detached, and the production and disassembly of the double container 1 can be performed with higher workability as compared with the conventional case where the inner container is attached and detached from the opening of the outer container. Can be improved.

Also, since the contents are stored in the inner container 3, the outer container 2 can be reused without touching the contents and without washing, so that resources can be saved and the inner container can be saved. Since only the container 3 needs to be newly manufactured, the manufacturing cost of the double container 1 can be reduced. Furthermore, since the outer container 2 and the inner container 3 can be easily attached and detached, the collection operation of the outer container 2 and the assembling operation of the double container 1 can be easily performed, and the recycling cost can be reduced.

Further, since the outer container 2 is configured to be openable and closable, the outer container 2 can be formed of a thick container having strength. Therefore, the inner container 3 has sufficient strength to support a load as long as the contents do not leak. No need to prepare. For this reason, a hollow container having a small wall thickness can be used as the inner container 3 and can be produced at low cost. The used inner container 3 is discarded, and a new inner container 3 is attached to the collected outer container 2. Since the double container 1 can be recycled, the recycling cost can be reduced as compared with the conventional case where the thick inner container is discarded and only the sheet-like outer casing is reused.

Further, the double container 1 is formed in a flat hexagonal shape, is easy to be horizontally stacked, and has a stacking structure for preventing the containers 1 from shifting or dropping during the horizontal stacking. It can be easily transported without falling down even if it is loaded on a loading platform. In addition, when the containers 1 are stored horizontally in a warehouse or a site, many containers 1 can be stored in a small space, and the inventory space can be reduced. Furthermore, since the double container 1 is provided with the grip 8 and has a flat shape, even when being lifted up by hand, it can be easily transported without hitting the body, thereby improving workability during transportation. it can.

When the empty double container 1 containing no liquid is transported, the double container 1 can be divided into the outer container 2 and the inner container 3, so that the outer container 2 is opened. , And the inner container 3 can be compressed and stacked and transported, and a large number of containers 2 and 3 can be transported in a small space, thereby reducing distribution costs.

Further, windows 7A, 7 are provided on the side of the outer container 2.
B is formed, and the inner container 3 is formed of a translucent material, so that the remaining amount of the contents can be easily confirmed from the windows 7A and 7B, and management during storage can be facilitated.

The present invention is not limited to the above-described embodiments, but includes modifications and improvements as long as the object of the present invention can be achieved.

For example, the material of the outer container 2 is not limited to that of the above embodiment, and various synthetic resins can be used. However, in order to ensure the attachment to the inner container 3, a hard resin is desirable, and particularly, a thermoplastic resin which is easy to mold is desirable. Further, the shape and size of the outer container 2 are not limited to those of the above-described embodiment, and may be appropriately set in implementation, and may be set particularly in accordance with the inner container 3.

Further, in the above embodiment, the outer container 2 is
Although it has been constituted by one container constituent member 4 and the hinge 5, it may be constituted by one bendable part, or two or more members may be connected by a hinge or the like. 2 should just be comprised so that opening and closing is possible. Further, in the above-described embodiment, the leg 6, the stacking structure, the windows 7A and 7B, the grip 8, and the like are provided. However, these are not necessarily provided, and each may be appropriately provided for implementation.

Further, the shape and size of the inner container 3 are not limited to those of the above-described embodiment, but may be set as appropriate for the implementation. However, the capacity of the inner container is 4 to 40 liters, especially 10 to 2 liters, depending on the material and the ease of loading and unloading and transportability.
About 0 liter is preferable. The material is not particularly limited as long as it is a material having chemical resistance. However, a thermoplastic resin is preferable in terms of ease of molding. In particular, as in the above-described embodiment, LLDPE is used, or LDPE (high-pressure Density polyethylene) or LLDPE and L
It is preferable to use a blend with DPE. Further, in the above-described embodiment, the inner container 3 is molded by inserting the flange 13 at the time of hollow molding of the inner container 3 after the injection molding, but the flange 13 is integrally molded with the inner container 3 without separate injection molding. You may. However, when the flange 13 is separately injection-molded and insert-molded as in the above-described embodiment, the inner container 3 having the flange 13 having an L-shaped cross section is preferable.
Can be easily formed and the productivity is good.

In the above embodiment, the inner container 3 is made of a translucent material so that the content can be checked. However, a transparent material or a partially transparent or translucent material may be used. Further, an opaque material may be used if it is not particularly necessary to check the content. Furthermore, in the above-described embodiment, the side surface of the inner container 3 is configured to be pleated so as to be compressible. However, it is not always necessary to provide the pleating process. For example, the configuration may be such that space can be saved, and these may be appropriately set in implementation.

[0036]

According to the double container of the present invention,
There is an effect that the inner container and the outer container can be easily attached and detached, resources can be saved, and the recycling cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a double container according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the double container of the embodiment.

FIG. 3 is a perspective view showing a deployed state of an outer container of the double container.

FIG. 4 is a sectional view showing a state before the hinge of the outer container is fixed.

FIG. 5 is a sectional view showing a fixed state of the hinge.

FIG. 6 is a perspective view showing a double container in a horizontally stacked state.

FIG. 7 is a cross-sectional view showing the double container in the horizontally stacked state.

FIG. 8 is a perspective view showing an inner container of the double container.

FIG. 9 is a sectional view showing a state before the outer container is locked.

FIG. 10 is a sectional view showing a locked state of the outer container.

FIG. 11 is a side view showing a state in which the double container is carried by hand.

FIG. 12 is a side view showing a state where the double container is carried by a carrier.

FIG. 13 is a cross-sectional view illustrating a stacked state of the outer container.

FIG. 14 is a side view showing a stacked state of the inner container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Double container 2 Outer container 3 Inner container 5 Hinge 10 Spout 11 Lock mechanism 12 Projection part 13 Flange 14 Cap

Claims (1)

(57) [Claims] 1. A double container comprising an outer container and an inner container made of a synthetic resin, wherein the outer container is formed so as to be openable and closable, and the inner container is formed detachably in the outer container. Along with the flange formed on the inner container when placed in the outer container ,
Move to the formed protrusion and fit it to the protrusion to
A double container comprising a lock mechanism that locks a joint of a side container with a flange to lock an outer container in an undeployable state.