JPH08268470A - Composite container - Google Patents

Abstract

PURPOSE: To provide a composite container which is not deformed by decompression even in the case of hot filling and is capable of completely separating a paper from plastic after use. CONSTITUTION: In a composite container 1 wherein an outside container 2 is joined integrally to the outside of an inside container 3 of plastic by blow molding in the cylindrical outside container 2 mainly composed of a paperred, the inside container 3 and the outside container 2 are bonded at their upper and lower parts, respectively, with an adhesive 6, and the intermediate parts thereof are not bonded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite container made of a combination of paper and plastic for containing a liquid content.

[0002]

2. Description of the Related Art Recently, soft drinks, alcoholic drinks, juices,
Polyethylene terephthalate bottles (PET bottles) are widely used as containers for liquid seasonings and the like.

However, as interest in environmental problems has increased in recent years, a container in which the amount of plastic used is reduced is desired. As a countermeasure, a composite container (back-in-box) in which a plastic bag-like container with a spout is housed inside an outer container made of paper is widely used. This container is lightweight and can be easily transported because it is small when the contents are not stored. Furthermore, the container can be reduced in volume at the time of disposal, and paper and plastic can be separated and discarded. Have the advantages of.

However, in order to manufacture this bag-like container with a spout, a single-layer or multi-layer film is bonded at its edge portions by heat sealing or the like, and then formed into a bag-like container. There is a disadvantage in that the number of manufacturing steps is large, because the spout formed by injection molding or the like must be joined by means such as welding. Also in terms of performance,
The heat seal part at the edge of the film and the weld part at the spout are
Impact resistance is generally inferior to parts other than the welded part, and the bag may break due to drop impact.

Therefore, a method has been proposed in which the problems of drop impact strength and the number of manufacturing steps are solved by molding the inner container by blow molding. In this method, an outer container mainly composed of paper whose inner surface is coated with an adhesive is placed in a blow mold, and a preform heated to a molding temperature is introduced into the outer mold and blow molding is performed. This is a method for producing a composite container which is integrated with an outer container mainly made of paper and combined with a plastic inner container formed by blow molding seamlessly.

However, even in the case of this container, a problem occurs when the contents are hot-filled. That is, juice, liquor, etc. are generally filled in a state where the contents are heated to a certain temperature for the purpose of sterilizing the container and then capped, but when the contents are cooled with the passage of time, the inside of the container is cooled. Since the container is deformed under reduced pressure, there is a problem that the quality of the appearance as a product deteriorates. As a countermeasure for this, it is conceivable to provide a convex surface that bulges outward on the body of the PET bottle, but it is impossible to combine the inner container and the outer container.

When the container is discarded, the paper and the plastic can be separated and discarded. However, if the adhesive strength of the adhesive is too strong, it is difficult to separate the paper and the plastic. When the paper is separated from the paper, the paper remains on the surface of the plastic, and if the adhesive strength of the adhesive is weak, the paper may peel off during use.

[0008]

SUMMARY OF THE INVENTION The present invention has been made by paying attention to the problems of such a composite container and has excellent strength against a drop impact and can be easily manufactured by a small number of steps. , Even if it is hot filled, it does not deform under reduced pressure, and the volume can be reduced at the time of disposal, and the paper does not peel off during use.
It is an object of the present invention to provide a composite container capable of completely separating paper and plastic when separating paper and plastic after use.

[0009]

In order to solve the above-mentioned problems, the composite container according to claim 1 of the present invention is made of plastic by performing blow molding in a cylindrical outer container mainly made of paper. In a composite container in which the outer container is integrally joined to the outer side of a manufactured inner container, the upper and lower parts of the inner container and the outer container are adhered by an adhesive, and the middle part is not adhered.

The composite container according to claim 2 of the present invention is characterized in that the outer container and the inner container are adhered to each other by an adhesive arranged in either a dot shape or a stripe shape.

In the composite container according to claim 3 of the present invention, the softening temperature of the adhesive at the upper and lower parts of the outer container and the inner container (in accordance with test method JAI-1) is lower than the molding temperature of the inner container, and It is characterized in that it is set higher than the filling temperature of the contents, and the softening temperature of the adhesive in the middle portion between the inner container and the outer container is set lower than the filling temperature of the contents.

[0012]

According to the first aspect of the present invention, since the adhesive is not interposed at the portion of the bottle which is largely deformed by the reduced pressure, only the inner container of that portion is deformed and absorbs the reduced pressure. The appearance of the outer container does not deteriorate due to deformation under reduced pressure. Moreover, since it is a composite container, the amount of plastic used can be greatly reduced and the drop strength can be maintained.
Further, since the paper and the plastic can be easily separated, the capacity can be reduced at the time of disposal to reduce the amount and volume of dust.

According to the second aspect of the present invention, the amount of plastic used can be greatly reduced, the capacity can be reduced at the time of disposal, there is no problem in physical properties, and it can be easily separated into paper and plastic at the time of disposal. In addition to the above, it is possible to change the adhesive strength between paper and plastic by setting the dot density and the stripe interval arbitrarily.

According to the third aspect of the present invention, appearance deterioration due to reduced pressure deformation does not occur even when hot filling is performed, the amount of plastic used is greatly reduced, and the capacity can be reduced at the time of disposal. Providing problem-free containers, we can reduce the volume and volume of waste.

[0015]

[First Embodiment] A composite container according to a first embodiment of the first aspect of the present invention will be described below with reference to the drawings. FIG. 1 shows a composite container according to an embodiment of claim 1. The composite container 1 is composed of a cylindrical outer container 2 having a rectangular cross section and mainly made of paper, and a plastic inner container 3 housed in the outer container 2. The inner container 3 has a body and a spout integrally formed by blow molding a preform. The shoulder portion and the bottom portion of the outer container 2 and the inner container 3 are adhesive 6
Are glued by. The shape of the composite container 1 is formed in a rectangular tube shape with a rectangular cross section here, but may be a cylindrical cross section or other shapes.

As a material for the inner container 3, polyethylene terephthalate resin, polypropylene resin, high nitrile resin, polystyrene resin, polyvinyl chloride resin, polycarbonate resin, polyamide resin, ethylene-vinyl acetate copolymer saponified resin, etc. are used. It may be a single layer or a multi-layered structure.

As the adhesive used for the composite container 2,
A hot melt type adhesive that does not soften at the filling temperature of the contents and exhibits adhesiveness at the molding temperature of the inner container 3 is desirable. As the hot melt adhesive, ethylene-vinyl acetate copolymer (EVA), ethylene ethyl acrylate (EEA), or one containing olefin as a main component can be used.

As an example of the method of manufacturing the composite container 1, as shown in FIGS. 2 (a) and 2 (b), a hot melt adhesive 6 is applied to one side of a paperboard 7. The hot melt adhesive 6 is applied only to the upper and lower portions 7a and 7b of the paper board 7 forming the outer container 3, and the hot melt adhesive 6 is not applied to the middle portion of the paper board 7. After the hot melt adhesive 6 is applied, the paperboard 7 is subjected to ruled lines and punching, and then a glue margin 7c or the like is sack-adhered to manufacture the cylindrical outer container 3 having the inner surface coated with the adhesive. .

While manufacturing the outer container 3, a plastic preform is molded by injection molding. Many preforms are produced in advance. The outer container 3 is set in a blow mold for forming the composite container 1, a preform heated to a molding temperature in advance is introduced therein, and blow molding is carried out to obtain the composite container 1.
Is manufactured.

In this composite container 1, the adhesive is interposed not in the entire area between the outer container 2 and the inner container 3 but in the upper and lower parts. Therefore, in the composite container 1 hot-filled with juice or other liquid, as the liquid content is cooled, the internal pressure is lowered and the inner container 3 is deformed, but the outer container 2 is inside. Since the upper and lower parts of the container 3 are adhered, no deformation of the inner container 3 can be seen and sufficient strength can be maintained.

The composite container 1 is excellent in drop impact strength, uses a small amount of plastic, is easily manufactured in a small number of steps, and the outer container 3 does not deform under reduced pressure even when hot filled. The composite container 1 is also effective for environmental protection because it has a performance that the volume of the inner container is thin and the volume can be reduced at the time of disposal.

[0022]

[Experimental Example 1] Next, Experimental Example 1 of Claim 1 and a comparative example thereof will be shown.

The composite container of Experimental Example 1 is a composite container 1 having a structure as shown in FIG. In this composite container 1, an outer container 3 made of 340 g / m ² of Manila cardboard is set in a mold, and a preform heated by an infrared heater is injection-molded with polyethylene terephthalate resin and the outer container 1 is used. Placed inside the 2
It is molded by axial stretch blow molding. Figure 2
A development view of the outer container 3 is shown in (a). An EVA hot melt adhesive is applied to the shaded area at a rate of 5 g / m ² . The inner container 3 and the outer container 2 of the composite container 1 are
Since only the upper and lower parts were adhered, they could be separated very easily after use, and no paper adhered and remained on the plastic side. The inner container 3 could be easily crushed to reduce the volume.

Table 1 shows the drop test results of this container. When this container was hot-filled with 88 ° C. juice and capped, there was no problem in the appearance of the container.

[0025]

Experimental Example 2 In Experimental Example 2 of Claim 1, 340 g / m ²
By placing the outer container 3 made of the Manila cardboard of No. 1 in the mold and heating the preform molded by injection molding using polyethylene terephthalate resin with an infrared heater to perform biaxial stretch blow molding, A container having an internal capacity of 1000 ml shown in was molded.

FIG. 2B shows a developed view of the outer container of Experimental Example 3. In the experimental example, a hot melt adhesive was applied as shown in FIG. An EVA hot melt adhesive is applied to the shaded area at a rate of 5 g / m ² . The inner container and the outer container of this composite container 1 could be separated after use, and the inner container could be easily crushed to reduce the volume.

Table 1 shows the drop test results of this container. When this container was hot-filled with 88 ° C. juice and capped, there was no problem in the appearance of the container.

[0028]

Comparative Example 1 In Comparative Example 1, the internal volume 10 having the shape shown in FIG.
A 00 ml composite container 10 was produced. As the inner container 11, a polyethylene film having a thickness of 0.2 mm is heat-sealed to form a bag shape, and a polyethylene-made spout formed by injection molding is welded thereto.
An outer container 12 made of 40 g / m ² of Manila cardboard was installed. The inner container 11 and the outer container 12 of this composite container 10 could be separated after use, and the inner container could be easily crushed to reduce the volume.

The drop test results are shown in Table 1. In the drop test, there was a problem with the strength of the fusion-bonded portion of the spout.

[0030]

[Comparative Example 2] In Comparative Example 2, an outer container made of 340 g / m ² of Manila cardboard was placed in a mold, molded by injection molding using polyethylene terephthalate resin, and heated by an infrared heater. The preform was placed in an outer container, and a container having an internal volume of 1000 ml having the shape shown in FIG. 1 was molded by biaxial stretch blow molding. The development view of the outer container is the same as that of the first embodiment, but the entire outer container is EV
A hot melt adhesive is applied at a rate of 5 g / m ² . The inner container and the outer container of this composite container could be separated after use, and the inner container could be easily crushed to reduce the volume.

Table 1 shows the drop test results of this container. When this container was hot-filled with 88 ° C. juice and capped, the outer appearance of the container was not good because the outer container was deformed by the reduced pressure deformation.

[0032]

[Table 1] The drop test results in Table 1 are as follows. Ten bottles were filled with water in a specified amount and stored at 5 ° C for 12 hours.
The figure shows the number of cracks when freely dropped from the height of m 10 times.

[0033]

[Second Embodiment] Next, a second embodiment of claim 2 of the present invention will be described.

Since the shape of the composite container of the second embodiment is the same as that of FIG. 1, its reference numeral is used. The composite container 1 is composed of an outer container 2 mainly made of paper, and a plastic inner container 3 housed in the outer container 2. The body 6 and the spout 5 of the inner container 3 are integrally formed by blow molding. Further, the shoulders and bottoms of the outer container 2 and the inner container 3 are adhered by the adhesives 7a and 7b shown in FIG. 2 (c).

As an example of the method for manufacturing this composite container,
First, hot melt adhesives 7a and 7b are applied to one surface of a paperboard, and then scoring and punching are performed, and then sack is attached to manufacture the outer container 2 having the adhesive applied to the inner surface. Next, a primary molded product called a plastic preform is molded by injection molding. And the outer container 2
Is placed in a blow mold, a preform heated to a molding temperature in advance is introduced therein, and blow molding is performed to manufacture the composite container 1.

FIG. 2 (c) shows a developed view of the outer container 2. The adhesives 7a and 7b are present in a dot shape only on the upper and lower portions of the outer container 2. In this embodiment, when the outer container 2 is separated, since the adhesive is not present in the portion to be gripped first, that portion serves as a trigger and can be easily peeled from there, but during use, the inner container 3 and the outer container can be separated. 2 does not separate and can be more easily separated when discarded.

2 (d) and 2 (e) are developed views of the outer container of another embodiment. The outer container 2 has an adhesive 8
Is applied in a striped pattern so that the adhesive portions and the non-adhesive portions are alternately arranged, so that the adhesive strength of the composite container 1 can be arbitrarily set by changing the area ratio of the adhesive portions and the non-adhesive portions. .

The adhesive 8 used in this container has a softening temperature higher than the hot filling temperature of the contents, and the inner container 3
A hot-melt type adhesive that exhibits adhesiveness at the molding temperature is desirable. As the hot melt adhesive, ethylene-vinyl acetate copolymer (EVA), ethylene ethyl acrylate (EEA), or one containing olefin as a main component can be used.

As the material of the inner container 3, polyethylene terephthalate resin, polypropylene resin, high nitrile resin, polystyrene resin, polyvinyl chloride resin,
Polycarbonate resin, polyamide resin, ethylene-
Vinyl acetate copolymer saponified resin etc. can be used,
They may have a single layer or a multilayer structure.

[0040]

Experimental Example 3 Next, Experimental Example 3 of claim 2 of the present invention will be shown. In Experimental Example 3, a preform molded by injection molding using polyethylene terephthalate resin was heated by an infrared heater, and a metal mold was placed on which an outer container 2 prepared using a 340 g / m ² Manila cardboard prepared in advance was placed. Biaxially stretch blow-molded inside, the internal volume shown in Figure 1 is 1000m
1 liter container was molded. FIG. 2C shows a developed view of the outer container 2. The EVA hot melt adhesive 7 is applied in a dot shape at a rate of 5 g / m ^{2 to} the shaded portion. The inner container 3 and the outer container 2 of this composite container could be completely separated into used paper and plastic after use.

[0041]

[Experimental Example 4] In Experimental Example 4 of claim 2, a preform molded by injection molding using a polyethylene terephthalate resin was heated by an infrared heater to be prepared in advance.
Biaxially stretch blow molding was performed in a mold in which the outer container 11 made of 0 g / m ² of Manila cardboard was placed to form a composite container having an internal capacity of 1000 ml shown in FIG. 1. Figure 2
A developed view of the outer container 2 is shown in (d). EVA-based hot melt adhesive is applied in stripes at a rate of 5 g / m ^{2 on} the shaded area. The inner container 3 and the outer container 2 of this composite container could be completely separated into used paper and plastic after use.

[0042]

[Comparative Example 5] A preform molded by injection molding using a polyethylene terephthalate resin is heated by an infrared heater, and an outer container prepared using a 340 g / m ² Manila cardboard prepared in advance is placed in a mold. Biaxially stretch-blow molded with a volume of 1000 ml in the shape shown in Fig. 1.
The container was molded. The development view of the outer container 1 is similar to that of Experimental Example 3, but the EVA hot melt adhesive is applied to the entire outer container at a rate of 5 g / m ² .

Inner container 3 and outer container 2 of this composite container
It was difficult to completely separate paper and plastic after use, and the paper was in a state of being attached to the surface of the plastic.

[0044]

[Third Embodiment] The shape of a composite container according to the third embodiment of the present invention (third embodiment) is the same as that shown in FIG. In FIG. 1, a composite container 1 is composed of an outer container 2 mainly made of paper, and an inner container 3 made of plastic and housed in an outer container 2. The inner container 3 is
The body 6 and the spout 5 are integrally formed by blow molding. The outer container 2 and the inner container 3 are adhered by an adhesive 9b.

As an example of a method of manufacturing the composite container 1, first, a hot melt adhesive is applied to one side of a paperboard, and then scoring and punching are applied to the paperboard, and then sack is applied to the inside to apply the adhesive to the outside. The container 2 is manufactured. Next, a plastic preform is molded by injection molding.
Then, the outer container 2 is placed in a blow mold, a preform heated to a molding temperature in advance is introduced therein, and blow molding is performed, whereby the composite container 1 is manufactured.

As shown in FIGS. 2 (f) and 2 (g), the outer container 2 is softened by the heat of the filled contents in the middle portion of the outer container, which is largely deformed by the reduced pressure inside the bottle. A low temperature softening type adhesive 9a having a low point is applied. The upper part and the lower part of the outer container 2 are bonded by a high temperature softening type adhesive 9b having a softening temperature higher than the filling temperature of the contents and lower than the molding temperature of the inner container 3.

As a result, the inner container 3 and the outer container 2 can be sufficiently adhered to each other during blow molding of the inner container. At the time of filling the contents, since the adhesive 9a in the middle part of the composite container 1 has a softening point lower than the filling temperature of the contents, the adhesive 9a flows in the middle part of the composite container 1 and the contents are cooled. Even if it solidifies again, the softening temperature of the adhesive 9b at the upper and lower parts of the composite container 1 is higher than the filling temperature of the contents, so that the outer container 2 may be deformed even if the middle part of the inner container 3 is deformed under reduced pressure. There is no.

Further, since the middle part of the composite container 1 is adhered by the low temperature softening type adhesive 9a and the shoulder and the bottom part are adhered by the high temperature softening type adhesive 9b, the outer container 3 can be used if the filling temperature is high. The intermediate part of the composite container 1 can be peeled off from the inner container 2 to maintain the appearance, and when the filling temperature is low, the reduced pressure deformation is small even if the intermediate part of the outer container 3 and the inner container 2 are not separated. The appearance can be maintained as it is, not only when the filling temperature of the contents is low but also when the filling temperature is high, and when the filling temperature is low, the whole container is adhered to further improve the strength.

The adhesive 9a used in this container is preferably a hot-melt type adhesive which has no adhesiveness at room temperature and exhibits adhesiveness at a filling temperature of the contents, for example, at a temperature of about 70 ° C. Further, the adhesive 9b is preferably a hot-melt type adhesive which does not have adhesiveness at room temperature but exhibits adhesiveness at the molding temperature of the inner container 3. As the hot-melt adhesive agent, ethylene-vinyl acetate copolymer (EVA), ethylene acrylethyl (EEA), or one containing olefin as a main component can be used. The setting of the adhesive temperature of the adhesive is set by the concentration of the adhesive.

As the material of the inner container 3, polyethylene terephthalate resin, polypropylene resin, high nitrile resin, polystyrene resin, polyvinyl chloride resin,
Polycarbonate resin, Polyamide resin, Ethylene-
Vinyl acetate copolymer saponified resin etc. can be used,
They may have a single layer or a multilayer structure.

[0051]

Experimental Example 5 Next, Experimental Example 5 and a comparative example thereof will be shown. In Experimental Example 5, a preform molded by injection molding using polyethylene terephthalate resin was used as an infrared heater.
It is heated up to 5 ° C and biaxially stretch blow-molded in the mold in which the outer container 2 prepared using the 340 g / m ² Manila cardboard prepared in advance is placed, and the inner volume of the shape shown in FIG.
A 00 ml container was molded.

FIG. 2 (f) shows a developed view of the outer container 2.
EVA hot-melt adhesive 9a with a softening temperature of 90 ° C was applied at a rate of 5 g / m ^{2 to} the shaded area, and EVA hot-melt adhesive with a softening temperature of 75 ° C was applied to the shoulder and bottom of the container. 9b was applied at a rate of 5 g / m ² .
The inner container 3 and the outer container 2 of this composite container 1 can be separated after use, and the inner container can be easily crushed to reduce the volume. The drop test results of this container are shown in Table 2. . Hot fill this container with juice at 85 ° C,
There was no problem in the appearance of the container when capped.

[0053]

[Experimental Example 6] In Experimental Example 6, a preform molded by injection molding using polypropylene resin was heated to 125 ° C. with an infrared heater to prepare 340 g / m ² in advance.
The outer container 2 prepared by using the Manila cardboard of No. 1 was biaxially stretch-blow-molded in a mold on which the outer container 2 was placed to form a composite container 1 having an internal capacity of 1000 ml as shown in FIG.

FIG. 2 (g) shows a developed view of the outer container 2 of Experimental Example 6. EVA hot melt adhesive 9 having a softening temperature of 90 ° C. on the shoulder and the bottom of the container and the parts supporting the four corners.
The a coating at a rate of 5 g / m ^2, the portion for supporting the middle portion of the vessel EVA-based hot melt adhesive 9b softening temperature 75 ° C. was applied at a rate of 5 g / m ^2. This composite container 1
The inner container 3 and the outer container 2 could be separated after use, and the inner container could be easily crushed to reduce the volume.

Table 2 shows the drop test results of this container. When the container was hot-filled with water at 85 ° C. and capped, there was no problem in the appearance of the container.

[0056]

[Comparative Example 5] As Comparative Example 5 of the inner container, a thickness of 0.2 mm
The end edges of the polyethylene film are heat-sealed to form a bag, and a polyethylene spout formed by injection molding is welded to the inner container to give 340 g.
/ M outer container using a ² Manila cardboard mounted was fabricated bag-in-box type of container shown in Figure 3 having an internal volume of 1000 ml. The inner container and outer container of the composite container could be separated after use, and the inner container could be easily crushed to reduce the volume. The drop test results are shown in Table 2. In the drop test, there was a problem in the strength of the fused portion of the spout.

[0057]

Comparative Example 6 As Comparative Example 6, a preform molded by injection molding using polyethylene terephthalate resin was heated to 95 ° C. with an infrared heater and prepared in advance 3.
Biaxially stretch blow molding was performed in a mold in which an outer container made of 40 g / m ² of Manila cardboard was placed to form a container having an internal capacity of 1000 ml shown in FIG. 1.

The development view of the outer container is similar to that of Experimental Example 1, but an EVA hot melt adhesive having a softening temperature of 90 ° C. is applied to the whole at a rate of 5 g / m ² . The inner container and the outer container of this composite container could be separated after use, and the inner container could be easily crushed to reduce the volume.

Table 2 shows the drop test results of this container. When this container was hot-filled with juice at 85 ° C. and capped, the outer appearance of the container was not good because the outer container was deformed by the reduced pressure deformation.

[0060]

[Table 2] The drop test results in Table 2 show that 10 bottles were filled with a specified amount of water and stored at 5 ° C for 12 hours, then 1 m on the concrete.
It shows the number of cracks when it is freely dropped 10 times from the height.

In the above embodiment, the area where the inner container 3 and the outer container 2 are adhered to each other by the adhesive agent of the composite container 1 is not limited to the shoulder portion and the bottom portion of the container, but the upper edge portion of the body portion. It may be the lower edge. In short, by sandwiching and adhering the parts that have the largest amount of deformation during cooling under reduced pressure,
The deformation of the outer container can be prevented, and the strength of the composite container itself can be maintained by bonding the upper and lower parts of the composite container. Therefore, the outer container 2 may have a tubular shape.

[0062]

According to the first aspect of the present invention, a physical appearance that does not cause a defective appearance due to pressure reduction deformation even when hot filling is performed, the amount of plastic used is greatly reduced, and the capacity can be reduced at the time of disposal By providing a container that does not have any problems, it is possible to reduce the volume and volume of garbage.

According to the second aspect of the invention, the amount of plastic used can be greatly reduced, and the capacity can be reduced when discarded.
There is no physical problem, and it can be easily separated into paper and plastic at the time of disposal, and the dot density,
The adhesive strength between the paper and the plastic can be changed as necessary by setting the interval between the stripes arbitrarily.

According to the third aspect of the present invention, appearance deterioration due to reduced pressure deformation does not occur even when hot filling is performed, the amount of plastic used is greatly reduced, and the capacity can be reduced at the time of disposal. Providing problem-free containers, we can reduce the volume and volume of waste.

As described above, according to the present invention, it has excellent strength against drop impact, is easily manufactured in a small number of steps, does not deform under reduced pressure even when hot-filled, and is reduced at the time of disposal. It can be stored and the paper does not peel off during use,
When separating paper and plastic after use, the paper and plastic can be completely separated.

[Brief description of drawings]

FIG. 1 is a sectional view of a composite container according to first to third embodiments of the present invention.

FIG. 2 (a) is a development view of an outer container of the first embodiment (experimental example 1) of claim 1, and FIG. 2 (b) is a second embodiment (experimental example 2) of claim 1. Figure 2 (c) of the outer container
Is a development view of the outer container of the embodiment (Experimental example 3) of claim 2,
2 (d) is a developed view of the outer container of the embodiment (Experimental Example 4) of claim 2, FIG. 2 (e) is an enlarged view of the striped adhesive of FIG. 2 (d), and FIG. 2 (f) is FIG. 2 (g) is a development view of the outer container of the embodiment (Experimental example 5) of claim 3 and FIG. 2 (g) is a development view of the outer container of the embodiment (Experimental example 6) of claim 3.

FIG. 3 is a cross-sectional view of a bag-in-box type composite container of a comparative example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Composite container 2 ... Outer container 3 ... Inner container 4 ... Body part 5 ... Spout 6,7a, 7b, 8 ... Adhesive 9a ... Low temperature type adhesive 9b ... High temperature type adhesive

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Katsuyuki Ohno 1-5-1 Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd.

Claims (3)

[Claims] 1. A composite container in which the outer container is integrally connected to the outside of a plastic inner container by performing blow molding in a cylindrical outer container mainly made of paper. A composite container in which the upper and lower parts of the outer container are adhered by an adhesive and the middle part is not adhered. 2. A composite container in which the outer container is integrally connected to the outside of a plastic inner container by performing blow molding in a cylindrical outer container mainly made of paper, wherein A composite container, which is adhered to the inner container with an adhesive coated in a dot shape or a stripe shape. 3. A composite container in which the outer container is integrally joined to the outer side of a plastic inner container by performing blow molding in a cylindrical outer container mainly made of paper, wherein The softening temperature of the adhesive above and below the inner container is set to be lower than the molding temperature of the inner container and higher than the filling temperature of the contents, and the adhesive of the intermediate portion between the inner container and the outer container is set. A soft container of which the softening temperature is set lower than the filling temperature of the contents.