JP7139750B2 - Composite container - Google Patents

Description

TECHNICAL FIELD The present invention relates to a composite container made of a combination of an outer container mainly made of paper and an inner container made of plastic, in consideration of saving petroleum resources and environmental conservation related to waste.

Conventionally, tray-like containers made of plastic such as polypropylene and polyethylene terephthalate are known as containers that store food, medical care, pharmaceuticals, etc. and that require a tight seal. Containers are widely used.

However, in recent years, in order to deal with environmental problems caused by an increase in waste and soaring oil prices, even in the above plastic tray-like container, an inner container with an ultra-thin plastic part and a paper to reinforce it are used. By combining an outer container made of steel into a composite container, it is possible to reduce the amount of petroleum-derived components, and to easily separate and separate paper and plastic at the time of disposal after use, so that each can be recycled. Various environmentally friendly containers have been proposed.

As a method for forming an environmentally friendly container made of a combination of paper and plastic, conventionally, as shown in FIG. There is a method of firmly adhering and fixing, and a method of pasting with a double-sided tape 44 as shown in FIG. 7(b). The method of fixing with adhesive is easy and reliable, but it is difficult to separate the outer container made of paper and the inner container made of plastic. There is a problem of inefficiency because it is difficult to automate the work of peeling off the separator.

As a method of fixing the double container, Patent Document 1 discloses a method of fixing by inserting the flange portion of the metal inner container into an insertion hole provided in the paper outer container. Separation is easy, but the work of inserting it into the insertion hole is complicated, and there is also the problem of low efficiency.

Further, Patent Document 2 exemplifies a double container in which a plastic container is inserted into a paper container. A method of heat-welding to seal the double container is disclosed.

However, in the double container to which the sealing method disclosed in Patent Document 2 is applied, the ends of the paper container and the plastic container are firmly heat-sealed at the flange, so when discarding after use, the paper There is a problem that it is difficult to cleanly separate the plastic container and the plastic container, and it is not easy to dispose of them separately.

Further, Patent Document 3 discloses a double container in which a flexible plastic bag container is inserted inside a paper container. is inserted into the paper container, and the mouth frame of the plastic bag container is separably fitted or adhered to the opening of the paper container. there is

However, the double container disclosed in Patent Document 3 requires a separate plastic molded mouth frame in order to integrate the paper container and the plastic bag body, and requires an extra plastic product. There is a problem that it is not preferable from the point of view of environmental friendliness and the cost is high.

JP-A-64-37368 JP-A-7-112707 JP-A-7-41046

The present invention has been made in order to solve the problems of the prior art as described above. To provide a highly environmentally friendly composite container which can be used as a composite container and which can be disposed of by easily removing the inner container from the outer container and disposing of the container separately.

In order to solve the above problems, the invention according to claim 1 of the present invention is
an outer container mainly made of paper, having a bottom surface and sidewalls erected from the periphery of the bottom surface;
A composite container comprising: an inner container mainly made of plastic and having a bottom and side surfaces, which is housed in the outer container,
Holes having a total area of 200 mm ² or more are provided through the bottom surface,
The distance between the peripheral edge of the hole and the peripheral edge of the bottom surface is 5 mm or more,
An adhesive label covering the hole is attached from the outside of the outer container,
The bottom of the inner container is attached to the adhesive label at the hole, so that the outer container and the inner container are separably integrated ,
The composite container is characterized in that the hole is divided into a plurality of parts, and bridges are formed between the divided holes .

Further, the invention according to claim 2 of the present invention is
2. The composite container according to claim 1, wherein the adhesive label is provided at one corner thereof with a separation starting portion that is not adhered to the bottom surface.

According to the present invention, the hole is provided in the bottom surface of the paper outer container, the adhesive label is attached from the outside of the outer container while covering the hole, and the adhesive surface of the adhesive label is attached to the outer container at the hole. The bottom part of the inner container which is exposed to the inside of the container and housed in the outer container is adhered to the adhesive surface of the adhesive label exposed at the hole portion to obtain the composite container in which the outer container and the inner container are integrated. In the composite container of the present invention, the inner container and the outer container can be easily integrated and fixed in a stable shape by simply housing the inner container in the outer container and sticking the bottom of the inner container to the adhesive label. The contents can be stored as a container of

At this time, if the total area of the holes is 200 mm ² or more, the inner container and the outer container can be integrated with sufficient adhesive force, and if the distance between the rim of the hole and the rim of the bottom is 5 mm or more, the outer container can be integrated. The container and the adhesive label can be adhered with sufficient adhesive strength, and the shape can be stabilized.

When disposing of the composite container after the contents have been consumed, the inner container can be easily removed from the outer container by peeling off the bottom of the inner container from the adhesive label. It is possible to obtain a highly environmentally friendly composite container that can be easily separated for recycling or disposal. Furthermore, the adhesive label can be peeled off from the outer container and separated for disposal.

FIG. 2 is an external schematic view of one form of the outer container and the inner container of the composite container of the present invention. FIG. 3 is a schematic cross-sectional view showing how the inner container is inserted into the outer container of the composite container of the present invention. FIG. 4 is a schematic cross-sectional view of the inner container of the composite container of the present invention attached to an adhesive label. FIG. 4 is a schematic cross-sectional view of a mode of removing the inner container from the composite container of the present invention. FIG. 4 is a schematic diagram illustrating another form of the hole and adhesive label of the composite container of the present invention. FIG. 4 is a diagram illustrating a configuration in which the adhesive label of the composite container of the present invention is provided with a separation starting portion; It is a cross-sectional schematic diagram of the conventional composite container.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments described below. Equivalent members and the like are denoted by the same reference numerals, and description thereof may be omitted.

FIG. 1 is a schematic external view of one form of the outer container and the inner container of the composite container of the present invention. It shows a state in which an outer container 1 made of paper and an inner container 2 made of plastic are separated. The outer container 1 has a rectangular bottom surface 11 and a side wall 12 erected along the periphery thereof. The sidewalls 12 are joined together with adjacent sidewalls to form a tray. A hole 13 is provided through the bottom surface 11, and an adhesive label 14 is attached to cover the hole 13 from the outer surface side of the outer container 1.例文帳に追加Therefore, the adhesive surface of the adhesive label 14 is exposed to the inside of the outer container 1 at the portion of the hole 13 .

If the hole 13 is provided substantially in the center of the bottom surface 11 and has a total area of 200 mm ² or more, the adhesion between the adhesive label 14 and the inner container 2 can be performed satisfactorily and stably. If the thickness is less than 200 mm ² , the adhesive strength is not sufficient, and the adhesive label 14 is easily peeled off due to vibration or the like when the contents are stored, and the integrity of the inner container 2 and the outer container 1 is likely to be impaired.

Also, the intervals a, b, c, and d between the peripheral edge of the hole 13 and the peripheral edge of the bottom surface 11 are set to 5 mm or more. If the interval is less than 5 mm, the folding angle of the crease line that is the periphery of the bottom surface 11 and the boundary with the side wall 12 tends to be wide due to the natural stiffness of the paper, and the flatness of the bottom surface 11 is impaired. As a result, the adhesion to the inner container 2 may become unstable. In addition, the area of the paper on the bottom surface 1 is narrowed, the rigidity of the bottom surface 11 is lowered, and the composite container is easily distorted. Furthermore, the area to which the adhesive label 14 is adhered is reduced, and various problems may arise such as the adhesive label 14 being easily peeled off.

The inner container 2 is a container formed by molding a plastic resin by a known molding technique such as injection molding or stretch blow molding. The inner container 2 is integrated with the outer container 1 by attaching an adhesive label 14 at a portion 23 overlapping the hole 13 of the outer container 1 when the inner container 2 is inserted into the outer container 1 . Further, a flange 24 is provided on the upper end of the side surface 22, and another lid member or the like can be adhered to seal the inner container 2. As shown in FIG.

The bottom surface 11 of the outer container 1 may be any polygonal, circular, or elliptical shape other than the rectangular shape illustrated in FIG.

FIG. 2 is a schematic cross-sectional view showing how the inner container is inserted into the outer container of the composite container of the present invention. An adhesive label 14 is attached from the outside to the portion of the hole 13 of the outer container 1 so as to cover the hole 13 . The adhesive label 14 can have, for example, a structure in which the adhesive layer 14 is laminated on the base material 142 . By sticking the bottom part 21 of the inner container 2 inserted at the portion 23 overlapping the hole 13 to the adhesive label 14, the outer container 1 and the inner container 2 are integrated as shown in FIG. is formed.

FIG. 4 is a schematic cross-sectional view of a mode of removing the inner container from the composite container of the present invention. When discarding the composite container 3 that has been used after consuming the contents, the flange 24 of the empty inner container 2 is held and pulled up, so that the adhesive label 14 that is not firmly adhered is removed. The adhesive on the inner container 2 can be peeled off. By pulling out the inner container 2, the inner container 2 made of plastic can be separated from the outer container 1 made of paper, and paper and plastic can be separately discarded without trouble.

In order to separate the inner container 2 from the outer container 1, in addition to the method described above, the adhesive label 14 is peeled off from the outer container 1 to remove the adhesive from the inner container 2 at the same time, and then the inner container 2 is taken out. You can do it.

The outer container 1 constituting the composite container 3 of the present invention is mainly formed of paper, and the material thereof is, for example, paperboard having a basis weight in the range of 150 to 500 g/m ² , such as coated board, uncoated board, and ivory. Paperboard such as special manila, chipboard, etc., and corrugated board may be used, but coatboard, ivory, etc. are preferably used in consideration of printability on the surface, and a composite container 3 with excellent cosmeticity can be obtained. can.

Further, the outer container 1 may be printed with characters, images, or the like, and may be coated with a water-resistant coating to increase water resistance.

As the material for the inner container 2 constituting the composite container 3 of the present invention, thermoplastic resins can be preferably used, such as polyethylene terephthalate resin, polypropylene resin, polystyrene resin, modified polyolefin resin, polyethylene resin and mixtures thereof. , polyacrylonitrile resins, polyvinyl chloride resins, ethylene-vinyl acetate copolymer resins, polycarbonate resins, nylon resins, polyvinyl alcohol resins, and the like, and are appropriately selected according to the type of contents, storage stability, molding method, etc. . For example, in the case of stretch blow molding, a polypropylene resin is preferably used because of its good stretch blow moldability, excellent water vapor barrier properties, and good sanitary properties.

In the composite container 3 of the present invention, for example, the inner container 2 made of plastic is made thinner than the conventional container made of plastic, and the thickness is reinforced with the outer container 1 made of paper to reduce the amount of plastic resin used. After use, the paper and plastic can be easily separated and separated, and the composite container 3 can be made easier to recycle.

FIG. 5 is a schematic diagram illustrating another form of the hole and adhesive label of the composite container of the present invention. In the example shown in FIG. 5(a), the shape of the hole 13 is elliptical. Since the corners of the bottom surface 11 are made of wide paper, the rigidity of the bottom surface 11 is increased, so that the composite container 3 is difficult to deform, and since the holes have no corners, cuts are made from the corners. Therefore, there is no possibility that the paper on the bottom surface 11 is torn.

In the example shown in FIG. 5(b), the hole 13 is a square with rounded corners, and the adhesive label 14 is attached so as to cover almost the entire bottom surface 11. In the example shown in FIG. Since the adhesive area between the bottom surface 11 and the adhesive label 14 is widened, they are surely adhered to each other, and when the contents are stored, they are not easily peeled off even when vibrations are applied, so that they can be integrated more reliably. Further, since the bottom surface 11 is uniform and flat, the composite container 3 is stable when placed on a desk or the like.

In the example shown in FIG. 5(c), the holes 13 are divided. By being divided like the holes 13a, 13b, a bridge 15 of paper forming the bottom surface 11 is formed between them,
The rigidity of the bottom surface 11 is increased, and deformation becomes difficult. At this time, if the total area of the holes 13a and 13b is set to 200 mm ² or more, the adhesive force required for adhesion to the inner container can be obtained.

FIG. 6 is a diagram illustrating a configuration in which the adhesive label of the composite container of the present invention is provided with a separation starting portion. For example, as shown in the upper figure, the separation start part 16 is provided at one corner of the adhesive label 14 with no adhesive layer, or as shown in the lower figure, a tab-shaped part without the adhesive layer is provided from one corner of the adhesive label 14 . can be formed by, for example, protruding and provided, but is not limited to these forms. The separation start part 16 can be a position where the adhesive label 14 starts to be peeled off from the outer container 1 when the composite container 3 is discarded. can be pulled up and the adhesive label 14 can begin to be peeled off.

As described above, according to the composite container of the present invention, the outer container made of paper and the inner container made of plastic can be easily integrated in a stable shape by pasting them together with an adhesive label. It is possible to provide a composite container that can be easily separated into a paper outer container and a plastic inner container, and that can be easily separated for disposal.

EXAMPLES The present invention will be described in more detail with reference to examples below.
<Common conditions and evaluation>
- The outer container was prepared by bending and pasting coated balls (basis weight: 310 g/m ² ).
・The inner container was made by sheet molding of polypropylene resin.
- The bottom surface of the outer container was made into a rectangular shape of 62 mm x 88 mm.
・Evaluation samples were prepared by changing the shape of the hole as shown below.
- When the peripheral edge of the bottom surface of the outer container was bent at a predetermined angle and a stable shape was obtained, it was evaluated as ◯, and when the angle was unstable and the shape was distorted, it was evaluated as x.
- 100 g of the content was put in, the lid was properly placed, and the container was shaken 10 times by hand.
・The evaluation results are summarized in Table 1.

<Example 1>
・A rectangular hole of 32 mm x 58 mm was provided in the center of the bottom surface.
• The area of the hole is ^1856mm2 .
・The distance between each side of the hole and the peripheral edge of the bottom is 15 mm.

<Example 2>
- An elliptical hole with a short diameter of 32 mm and a long diameter of 58 mm was provided in the center of the bottom surface.
• The area of the hole is ^1458mm2 .
・The distance between the end of the hole in the major and minor diameter directions and the peripheral edge of the bottom surface is 15 mm.

<Example 3>
・A rectangular hole of 10 mm x 20 mm was provided in the center of the bottom surface.
• The area of the hole is ^200mm2 .
・The distance between each side of the hole and the periphery of the bottom is 26 mm in the short side direction and 34 mm in the long side direction.

<Example 4>
- A 32 mm x 78 mm rectangular hole was provided in the center of the bottom surface.
• The area of the hole is ^2512mm2 .
・The distance between each side of the hole and the periphery of the bottom is 15 mm in the short side direction and 5 mm in the long side direction.

<Comparative Example 1>
・A rectangular hole of 10 mm x 10 mm was provided in the center of the bottom surface.
• The area of the hole is ^100mm2 .
・The distance between each side of the hole and the periphery of the bottom is 26 mm in the short side direction and 39 mm in the long side direction.

<Comparative Example 2>
・A rectangular hole of 32 mm x 82 mm was provided in the center of the bottom surface.
• The area of the hole is ^2624mm2 .
・The distance between each side of the hole and the periphery of the bottom is 15 mm in the short side direction and 4 mm in the long side direction.

<Comparative Example 3>
・A rectangular hole of 10 mm x 10 mm was provided on the bottom surface.
• The area of the hole is ^100mm2 .
・The distance between each side of the hole and the periphery of the bottom is 48 mm on one of the short sides, 4 mm on the other, and 39 mm on the long side.

As shown in Table 1, all of the composite containers of the present invention were integrated with sufficient adhesive force, and the inner container and the outer container could be easily separated. The shape of the container was also stable. On the other hand, in Comparative Example 1, the container was well bent at the periphery of the bottom surface and the shape of the container was good, but the adhesive force was insufficient. In Comparative Example 2, although the adhesive strength was sufficient, the angle of the bent portion was large and the shape was poor. Further, in Comparative Example 3, the adhesive strength was insufficient, the angle of the bent portion was large, and the shape was poor.

Reference Signs List 1 Outer container 11 Bottom surface 12 Side wall 13 Hole 14 Adhesive label 141 Adhesive layer 142 Base material 15 Bridge 16 Tab 2 ... Inner container 21 ... Bottom part 22 ... Side surface 23 ... Portion overlapping hole 24 ... Flange 3 ... Composite container

Claims (2)

an outer container mainly made of paper, having a bottom surface and sidewalls erected from the periphery of the bottom surface;
A composite container comprising: an inner container mainly made of plastic and having a bottom and side surfaces, which is housed in the outer container,
Holes having a total area of 200 mm ² or more are provided through the bottom surface,
The distance between the peripheral edge of the hole and the peripheral edge of the bottom surface is 5 mm or more,
An adhesive label covering the hole is attached from the outside of the outer container,
The bottom of the inner container is attached to the adhesive label at the hole, so that the outer container and the inner container are separably integrated ,
A composite container , wherein the hole is divided into a plurality of parts, and bridges are formed between the divided holes . 2. The composite container according to claim 1, wherein the adhesive label is provided at one corner thereof with a separation starting portion that is not adhered to the bottom surface.

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