JPH08133337A - Composite container - Google Patents

Abstract

PURPOSE: To provide a composite container consisting of an external container of which the major component is paper, and an internal container made of a plastic which is placed in the external container. CONSTITUTION: A composite container 4 consists of an external container 1 of which the major component is paper, and an internal container 2 made of a plastic which is placed in the external container 1. As a material for the internal container 2, a layer which contains a recovered material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite container comprising an outer container made of paper having shape retention and a plastic container housed inside the outer container, particularly an inner container made of plastic having a rigid mouth portion. It is about.

[0002]

2. Description of the Related Art At present, a plastic container having a shape-retaining property is widely used as a container for storing various detergents, beverages, etc., and is generally discarded after the content liquid is used. In recent years, the depletion of underground resources has become a problem, and on the other hand, with the increase of garbage, the delay in the disposal system has become a social problem, and protection of the global environment is being called for. Therefore, as a countermeasure against them, there is a reduction in the amount of garbage, and the reuse of resources, that is, the so-called recycling movement has been activated.

In recent years, plastics have also been reused, and used plastics such as polyethylene terephthalate or waste plastics are recycled as recycled materials, and plastic products are molded again using trays or pallets. There is. However, regarding plastic containers, the use of recycled materials has problems such as inclusion of foreign substances such as carbides, spoiling the aesthetics of the container due to stains on the recycled resin, fading or discoloring of the container, etc.
At present, it is not generally used.

In order to deal with today's environmental problems,
In addition to the use of recycled materials, it is also required to reduce the amount of plastic used.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to take the above-mentioned situation into consideration, and it is possible to effectively utilize recycled materials for plastic containers and the amount of plastic used. It is to provide a reduced number of composite containers.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides an outer container made of paper having shape retention and a rigid plastic container having an opening portion housed inside the outer container. A composite container comprising the inner container of 1), which has a layer containing a recycled material as a molding material of the inner container.

A detailed description will be given below with reference to the drawings. In FIG. 1 showing an example of the composite container of the present invention, it is composed of a paper-made cylindrical outer container 1 having a shape-retaining property, and an inner container 2 having a mouth / neck portion 3 accommodated in the outer container 1. In order to facilitate the separation of the outer container 1 and the inner container 2 after use of the contents, for example, a recess is provided in the body of the inner container 2, and the recess is provided at the upper end of the outer container 1, for example. It is advisable to insert the locking flaps or to partially bond the outer container 1 and the inner container 2 in a certain pattern.

As a result, the outer container 1 covers the surface (body) of the inner container 2 except for the mouth / neck portion 3 and the bottom of the inner container 2, so that foreign substances are contaminated when the recycled material is used. It can be eliminated, and the aesthetics of the container will not be spoiled.

The outer container 1 is preferably made of a material such as a paper tube having a relatively large thickness and a high rigidity, but it is also possible to use a rectangular paperboard which is formed by adhering the end portions of each other in a tubular shape. .

The outer container 1 may have a structure in which the shoulder and the bottom of the inner container 2 are covered as shown in FIG. 2, and by doing so, the rigidity is further improved.

As the molding material for the inner container 2, polyethylene, polypropylene, polyacrylonitrile, nylon, polyethylene terephthalate, polyvinyl chloride or the like can be used, but it is considered to have higher strength and better moldability. Then it is desirable to use polyethylene terephthalate.

By using a biaxially stretch blow molding method, polyethylene terephthalate can be made ultra thin and the amount of waste can be reduced. Further, since the calories burned during the burning treatment are lower than those of other materials, the environment is not adversely affected.

Since the outer container 1 also reinforces the composite container 4, the buckling strength of the composite container 4 does not decrease even when the plastic thickness of the inner container 2 is extremely thin, and the impact strength of the composite container 4 can be prevented from falling. Also, it will not be easily damaged. Further, since the outer container 1 and the inner container 2 can be easily separated from each other, the paper container and the plastic container can be separated when the contents liquid is used and then discarded without being bulky.

As a method of molding the inner container 2, a direct blow molding method, a biaxial stretch blow molding method, or the like can be used. As a method for combining the outer container 1 and the inner container 2, there is a method in which the inner container 2 is first molded and then the outer container 1 is fitted, and separately from this, the outer container 1 is molded into the inner container 2. There is also a method in which the inner container 2 is previously inserted into a molding die, the inner container 2 is blow-molded in the inserted state, and the outer container 1 is bonded simultaneously with the blow molding. Further, in the composite container 4 of the present invention, the inner container 2 may have a multi-layered structure.

The use of the recycled material as the innermost layer of the container is inferior in mechanical strength to the use of the virgin material (unused material), and the contents come into contact with foods, pharmaceuticals or human body. In the case of toiletries such as cosmetics, shampoos and conditioners, there is also a problem with hygiene. In order to solve it, virgin material is used for the outer and inner layers,
When a recycled material is used for the intermediate layer, the poor mechanical strength can be overcome, and since the inner layer in contact with the contents is a virgin material, there is no problem in hygiene.

[0016]

In the present invention, when a recycled material is used, foreign matters, carbides and the like mixed in the recycled material can be made inconspicuous, and discoloration of the container can be made inconspicuous, so that the appearance of the container body is spoiled. It is possible to effectively utilize recycled materials without any problems. At the same time, since the thickness of the inner container can be reduced in this container, the amount of plastic used can be reduced.

[0017]

Examples of the present invention will be described below. (Example 1) Using a recycled material of high-density polyethylene resin, a basis weight of 33 g by direct blow molding and an internal volume of 10
The inner container 2 having a recess a of 00 ml above the body was molded. A cardboard is used on the outside of the inner container 2, and a cylindrical outer container 1 having a locking flap b at the upper end is fitted and fixed to the recess a and the locking flap b, as shown in FIG.
A container having the structure shown in was produced. This composite container has no problem in appearance, and the inner container 2 and the outer container 1 can be easily separated after use by holding the outer container 1 and the inner container 2 and pulling them up and down. It was Table 1 shows the drop test results and the buckling test results.

Example 2 A preform was molded by injection molding using a recycled material of polyethylene terephthalate resin, the preform was heated by an infrared heater and biaxially stretch blow molded to give a basis weight of 15 g and an internal volume of 1000 m.
1 inner container was molded. A cylindrical outer container made of cardboard was attached to the outside of this container in the same manner as in Example 1, and
A container having the structure shown in was produced. This composite container also had no problem in appearance, and the inner container and the outer container could be easily separated after use. Table 1 shows the drop test results and the buckling test results.

(Example 3) A preform was formed by injection molding using a recycled material of polyethylene terephthalate resin, the preform was heated by an infrared heater, and bottomed with a cardboard prepared in advance before blow molding. An inner container having a basis weight of 15 g and an internal volume of 1000 ml was molded by biaxial stretching blow molding in a mold in which the cylindrical outer container was installed to produce a container having a structure shown in FIG. This composite container also has no problem in appearance, and the inner container and the outer container are
It could be easily separated after use. Table 1 shows the drop test results and the buckling test results.

(Example 4) By multi-layer blow molding, unused (virgin) high-density polyethylene resin was used for the outer and inner layers, and recycled high-density polyethylene resin was used for the intermediate layer. Product 1
A 000 ml inner container was molded. An outer container made of cardboard was attached to the outside of this container to manufacture the container shown in FIG. This composite container also had no problem in appearance and also had no problem in hygiene. Further, the inner container and the outer container could be easily separated after use. Table 1 shows the drop test results and the buckling test results.

(Embodiment 5) A preform formed by two-layer and three-layer molding using multilayer injection molding and using unused (virgin) polyethylene terephthalate resin for the outer and inner layers and polyethylene terephthalate resin for the recycled material as the intermediate layer is infrared rays. After heating with a heater, an inner container having a basis weight of 15 g and an internal volume of 1000 ml was formed by biaxial stretching blow molding.
A cylindrical outer container made of cardboard was attached to the outside of this container to manufacture the container shown in FIG. This composite container also had no problem in appearance and also had no problem in hygiene. Further, the inner container and the outer container could be easily separated after use. Table 1 shows the drop test results and the buckling test results.

[0022]

[Table 1]

Regarding the drop test results in Table 1, 10 bottles were filled with water in a specified amount (1000 cc), and the temperature was 5 ° C.
Stored for 12 hours at 1, then 1m above the concrete height
The number of cracks in the case of free fall 0 times is shown. Further, the buckling strength indicates the buckling strength at the yield point when compressed at a compression speed of 20 mm / g.

Although the cross-sectional shapes of the outer container and the inner container are not specified in the above description of the embodiment,
Of course, circular, oval, triangular, quadrangular and polygonal shapes can be used.

[0025]

INDUSTRIAL APPLICABILITY The composite container of the present invention can effectively utilize recycled materials, and can significantly reduce the amount of plastic used, so that it has the effect of reducing the amount of waste and uses recycled materials. This has the effect of recycling plastics and is an excellent container when considering environmental issues.

Further, if polyethylene terephthalate resin is used for the inner container, the container can be made ultra-thin, and since the calories burned at the time of incineration after disposal is low, there is an effect that the environment is not adversely affected.

Further, when the inner container has a multi-layered structure, the deterioration of mechanical strength and sanitary problems due to the use of a recycled material for the intermediate layer can be overcome, and the plastic can be recycled. .

[0028]

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a composite container of the present invention.

FIG. 2 is a cross-sectional view of another embodiment of the composite container of the present invention.

[Explanation of symbols]

 1: Outer container 2: Inner container 3: Mouth neck 4: Composite container a: Recessed b: Locking flap

Claims (4)

[Claims] 1. A composite container comprising an outer container mainly made of paper and a plastic inner container housed inside the outer container, having a layer containing a recycled material as a molding material for the inner container. A composite container characterized by. 2. The composite container according to claim 1, wherein the material of the inner container is polyethylene terephthalate. 3. The composite container according to claim 1, wherein the inner container has a multi-layered structure, the outermost layer and the innermost layer are made of a virgin material, and the intermediate layer thereof contains a recycled material. 4. The composite container according to claim 3, wherein the material of the intermediate layer of the inner container is polyethylene terephthalate.