JPH06278136A - Treatment of container made of synthetic resin - Google Patents

Abstract

PURPOSE:To reduce a transportation cost of a synthetic resin made container which has been needless after use by a method wherein the synthetic resin made container after use is shrinked to an extent that it is not restored to an original state, transported under a shrinked state as it is, and scraped or processed for reclamation. CONSTITUTION:A barrel part 3 having flexibility of a synthetic resin made container 1 is bound wholly over from a mouth stopper part 2 to a bottom part 4, and its volume is reduced. At that time, the barrel part 3 widens left and right by the bound content, and is deformed in a flat board state. A volume of the synthetic resin made container 1 which has been vacant after use is lessened than a volume under a state wherein it is filled with contents thus. It is transported under that state to a reclaimed site, an incineration site, or a plant for recycling, etc. Thereby, a more number of the synthetic resin made containers can be transported at once, and their transportation costs can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for disposing of a flexible synthetic resin container when it becomes dust after use.

[0002]

2. Description of the Related Art Synthetic resin containers are relatively easy to manufacture, have excellent mechanical strength such as impact resistance, and can be designed in various ways to give a good impression to the product. It is widely used because of its effect.

[0003] After use, a synthetic resin container that is no longer needed is generally subjected to disposal such as incineration or landfill, but it does not decompose in the soil and only emits high heat when burned. Not only because there is a concern that toxic gas may be emitted,
It is being promoted to separately collect and reuse (recycle) as resin or oil.

[0004] Conventionally, the synthetic resin container that has been used as waste after being used is loaded on a truck or the like in the usual form, that is, in the same form as the one in which the contents are filled, and the landfill or incinerator. Or it is transported to a recycling plant, etc., where
It was compressed or finely crushed and then subjected to treatment such as disposal and recycling.

[0005]

However, although the synthetic resin container is light in weight, it is very bulky in a normal form, and therefore, even if it becomes dust after use like the above-mentioned conventional example, it is in a normal form. If it is transported as it is, for example, there is a limit to the amount of transportation per truck, and the transportation cost is high, which is one of the major problems in reusing synthetic resin containers.

[0006] In particular, some synthetic resin containers have a considerably large internal volume of 20 liters and 30 liters, and in such a large case, such an adverse effect was remarkable.

In view of the above, the present invention reduces the transportation cost for a synthetic resin container that is no longer needed after use,
Thus, it is an object of the present invention to provide a convenient container for treating a synthetic resin container after use.

[0008]

In order to achieve the above object, the method for treating a synthetic resin container according to the present invention is such that the synthetic resin container after use is shrunk to such an extent that it does not return to its original state. It is characterized in that it is transported as it is and discarded or recycled.

Here, the air inside the used synthetic resin container is vacuum-sucked to shrink it, or a plurality of used synthetic resin containers are selected from polyethylene, polypropylene and polyester. It is also possible to put the synthetic resin container in a flexible bag made of at least one kind of resin and reduce the pressure inside the bag to shrink the synthetic resin container.

[0010]

According to the present invention constructed as described above, the occupied volume occupying the space is reduced by shrinking the used synthetic resin container to such an extent that the container is not restored to its original state. By carrying out the transportation in the state, for example, the transportation amount per truck is increased as compared with the conventional one to reduce the transportation cost, and the compressed state is utilized to further compress the transportation cost. It can be crushed into small pieces for disposal such as landfill or incineration, or for recycling.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows a conventional form, that is, a synthetic resin container 1 which is in the same state as when the contents are filled and is a waste after use. The synthetic resin container 1 is made of a flexible synthetic resin. It is configured.

Examples of this type of synthetic resin include polyethylene, polypropylene, poly-1-butene, and poly-4.
-Polyolefin such as methyl-1-pentene, 6-nylon, 6,6-nylon, 6,10-nylon, 10-
Polyamide resins such as nylon, 11-nylon and 12-nylon, thermoplastic polyesters such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate, polycarbonate, ethylene / vinyl alcohol copolymers, polyarylate resins and other heat A plastic resin can be mentioned. These resins may be mixed and used, or may have a multilayer structure.

Among these synthetic resins, the most effective synthetic resin having a good balance of rigidity and flexibility is widely used as a raw material for containers of soft drinks, carbonated drinks and liquid seasonings. Polyethylene terephthalate resin can be mentioned.

This synthetic resin container 1 has a non-flexible spigot portion 2 which can be fitted with a cap.
And a body portion 3 having a diameter larger than that of the spout portion 2 and having low rigidity and flexibility, and a bottom portion 4 having higher rigidity and larger wall thickness than the body portion 3.

The synthetic resin container 1 is merely an example, and it is needless to say that the container 1 is not limited to this shape, and the cross-sectional shape is circular, elliptical, triangular, It may be a quadrangle or any other shape.

The synthetic resin container 1 is formed by, for example, a method of melting a synthetic resin and directly molding the container by injection molding or extrusion molding, extruding a sheet, reheating the sheet, and then thermoforming the molded container. Alternatively, the preform obtained by the injection molding or extrusion molding may be reheated and then biaxially stretched to form a biaxially stretched hollow container.

Then, when the synthetic resin container 1 becomes dust, that is, when the inner filling is completely emptied and is no longer needed, the container is contracted by decompression to the extent that it cannot be restored to its original state. The occupied volume occupying the space of the synthetic resin container 1 is reduced, and the state at this time is shown in FIG.

As shown in the figure, in the case of this embodiment, mainly the flexible body portion 3 of the synthetic resin container 1 is connected to the plug portion 2.
The volume is reduced by straddling the bottom part 4 to the whole part. At this time, as shown in FIG.
Expands to the left and right by the amount of the bundle, and transforms into a flat plate.

As described above, the volume of the empty synthetic resin container 1 after use is reduced from the volume filled with the contents (hereinafter referred to as volume reduction), and in this state, the landfill or incinerator, Alternatively, it is transported to a reprocessing plant or the like, whereby more synthetic resin containers 1 can be transported at one time and the transportation cost can be reduced.

Here, the degree of reduction in volume of the synthetic resin container 1 with respect to the filled state (volume reduction rate = (volume of container after volume reduction treatment / volume of container filled with contents)) × 100 (%) is preferably 90% or more. This is because the higher the volume reduction rate is, the higher the effect is. Therefore, it is preferable to thoroughly compress the volume as much as possible.

There are various methods for reducing the volume of the synthetic resin container 1, that is, a volume reducing treatment method. A first example is shown in FIG. According to this method, the plug portion 2 of the synthetic resin container 1 is fitted into a cylindrical fitting jig 5 connected to a vacuum device, and the vacuum device is operated to cause the synthetic resin to pass through the fitting jig 5. The volume of the synthetic resin container 1 is reduced by reducing the pressure inside the container 1.

At this time, the volume reduction rate of the synthetic resin container 1 can be adjusted by adjusting the degree of pressure reduction by the vacuum device. FIG. 4 shows a second example of the volume reduction treatment method, and this method comprises a plurality of synthetic resin containers 1
The synthetic resin container 1 is placed in a flexible plastic bag 6 and the mouth portion 7 of the bag 6 is connected to a vacuum device and the vacuum device is operated to maintain a reduced pressure. The volume is reduced to such an extent that it does not return to its original state, and then the bag body 6 enclosing the synthetic resin container 1 is bound with a binding material 8 such as a string.

At this time, if each synthetic resin container 1 is placed inside the bag body 6 in a direction in which the plug 2 of the container 1 faces the mouth portion 7 of the bag body 6, the volume of the inside is reduced. It is preferable above. According to this method, it is possible to reduce the volume of a large number of synthetic resin containers 1 at a time, and moreover, the synthetic resin containers 1 can be handled by handling the bags 6 without handling the synthetic resin containers 1 individually. It is possible to facilitate the transportation of the product and the following disposal or recycling process.

As the flexible plastic bag body 6 used in this method, for example, polyethylene,
Polypropylene, poly-1-butene, poly-4-methyl-
Homopolymers or copolymers of α-olefins such as 1-pentene, 6-nylon, 6,6-nylon, 6,10
A film of a thermoplastic resin such as polyamide resin such as nylon, polyester resin such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate and the like is formed into a bag, and the mouth portion 7 is provided therein.

In addition to the cord, the binding member 8 may be, for example, an adhesive tape, a synthetic resin band, a synthetic resin net, or a shrink film. The bag body 6 having flexibility for reducing the volume has a structure capable of maintaining the internal airtightness because it facilitates the volume reduction process by depressurization, but when the capacity of the vacuum device is large, etc. In the above, the structure is not necessarily required to maintain the internal airtightness.

FIG. 5 shows a third example of the volume reduction treatment method, in which the synthetic resin container 1 is depressurized while the spout portion 2 is brought close to the mouth portion 10. Put in the reduction container 9 whose internal volume is reduced,
The mouth portion 10 provided in is connected to a vacuum device, and the vacuum device is operated to reduce the internal volume of the reduced container 9 due to the pressure reduction, thereby reducing the volume of the synthetic resin container 1.

That is, in the reducing container 9, the lid 12 that hermetically covers the opening of the box 11 is lowered as the pressure is reduced,
As a result, the volume of the synthetic resin container 1 housed inside is reduced.

Then, as described above, the waste synthetic resin container 1 is shrunk to such an extent that it does not return to its original state, and in this shrunken state, a landfill or an incinerator,
Alternatively, it is transported to a reprocessing plant where it is disposed of or reclaimed such as landfill or incineration.

That is, since the synthetic resin container 1 that has become waste after use is transported in a contracted state, it can be further compressed as necessary when it is subjected to landfill or incineration. , Crush it into small pieces, or cut it into small pieces with a cutter, bury it in the soil, or incinerate it. To recycle, for example, it is finely crushed or cut with a cutter or the like, or it is melted with an extruder and reused without cutting. At this time, as described above, the plastic bag body 6 is used. When the synthetic resin container 1 is wrapped and conveyed, the bags 6 can be disposed of.

[0030]

Since the present invention has the above-mentioned structure,
If the volume reduction rate is set to 90% without occupying the space for transporting the synthetic resin container that becomes waste after use, the volume occupied by the synthetic resin container is set to a normal 1
/ 10 or less, which can greatly reduce the transportation cost.

Moreover, the state of being transported can be used as it is for subsequent processing, which simplifies the processing and, for example, even in general retail stores and supermarkets, it is made of synthetic resin. The container can be contracted relatively easily.

[Brief description of drawings]

FIG. 1 is a front view showing an example of a state in which a synthetic resin container after use is contracted.

FIG. 2 is a front view showing a state before shrinkage of the synthetic resin container shown in FIG.

FIG. 3 is a schematic view showing an example of a volume reduction processing method for obtaining the empty synthetic resin container shown in FIG.

FIG. 4 is a schematic view showing another example of the volume reduction processing method.

FIG. 5 is a schematic diagram showing still another example of the volume reduction processing method.

[Explanation of symbols]

 1 Synthetic resin container 2 Plug part 3 Body part 4 Bottom part 5 Fitting jig 6 Bag body 8 Bundling member 9 Reduced container

Claims (7)

[Claims] 1. A synthetic resin container characterized by shrinking a used synthetic resin container to such an extent that it does not return to its original state, and then transporting it in this contracted state for disposal or recycling. Processing method. 2. The air inside the synthetic resin container after use is vacuum-sucked to shrink the air.
A method for treating a synthetic resin container described in the above. 3. The used synthetic resin container is placed inside a flexible bag, and the inside of the bag is decompressed to shrink the synthetic resin container. Method for processing synthetic resin containers. 4. The flexible bag is selected from polyethylene, polypropylene and polyester.
The method for treating a synthetic resin container according to claim 3, wherein the container is made of at least one kind of resin. 5. The method for treating a synthetic resin container according to claim 1, wherein the handling is storage or transportation. 6. The method for treating a synthetic resin container according to claim 1, wherein the synthetic resin is polyethylene terephthalate. 7. The method for treating a synthetic resin container according to claim 6, wherein the synthetic resin container is a polyethylene terephthalate biaxially stretched hollow bottle.