JP6828275B2 - Packaging container and its manufacturing method - Google Patents

Description

The present invention relates to a packaging container for filling a liquid such as a soft drink or a dairy product.

Patent Document 1 describes a brick-shaped paper container provided with a straw. In the paper container described in Patent Document 1, a strip-shaped packaging material having a thermoplastic resin on both sides is sealed in a tubular shape to fill the contents, and then sealed and cut in a direction crossing the tubular packaging material. It is manufactured by forming a pillow-shaped prototype container and then folding the flap portion of the prototype container to form a rectangular parallelepiped shape. The strip-shaped packaging material is provided with creases in advance so that the flap portion can be easily folded and molded from the prototype container.

Japanese Unexamined Patent Publication No. 2013-13526

In a paper container as described in Patent Document 1, a packaging material containing a barrier layer is generally used in order to improve the storage stability of the contents. As a material that can be used as a barrier layer, in addition to a metal foil such as aluminum, there is a thin-film film in which a thin-film film such as aluminum or silicon oxide is provided on a plastic film. However, when the thin-film film provided with the thin-film film is used as the packaging material for the paper container described above, the thin-film film may be damaged during the crease processing and the barrier property may be significantly impaired.

Therefore, an object of the present invention is to provide a packaging container in which damage to the barrier layer is suppressed and excellent in barrier properties, and a method for producing the same.

The packaging container according to the present invention is composed of a sheet material containing at least a paper base material and a sealant layer on the outermost surface, and has a box-shaped outer container having a top surface portion, a bottom portion, and a peripheral wall portion, and at least both sides of the barrier layer. It consists of a laminated film containing a sealant layer and includes an inner container that is sealed inside the outer container. The inner container is not sealed on the peripheral wall of the outer container, but only on the top and bottom of the outer container. it is, on the top surface and bottom of the outer container, a shall which have a common seal portion in common sealed overlapping two laminated films between two sheet materials.

The present invention also relates to a method for manufacturing a box-shaped packaging container including an outer container and an inner container enclosed in the outer container. The manufacturing method according to the present invention is a step of rolling and back-pasting a laminated film containing at least a barrier layer and a sealant layer on both sides, and performing a creaking process on a sheet material containing at least a paper base material and the outermost sealant layer. Between the process of forming creases and the process of forming a double tube by rolling and back-pasting the crease-processed sheet material so as to surround the laminated film that was rolled and pasted on the back. In the process of forming a pillow type container by stacking two laminated films on top of each other and sealing them in common in the transverse direction of the double tube, and cutting the sealed area in the transverse direction of the double tube, and the creases formed by creaking. It includes a process of bending a pillow-shaped container to form a box shape.

According to the present invention, it is possible to provide a packaging container having excellent barrier properties and a method for producing the same, in which damage to the barrier layer is suppressed.

Perspective view of the packaging container according to the embodiment Sectional drawing along the II-II line shown in FIG. The schematic which shows the manufacturing method of the packaging container which concerns on embodiment Sectional view taken along the IV-IV line shown in FIG. Perspective view of the packaging container according to the first modification Perspective view of the packaging container according to the second modification

FIG. 1 is a perspective view of the packaging container according to the embodiment, and FIG. 2 is a cross-sectional view taken along the line II-II shown in FIG. In FIG. 2, for the sake of simplicity, the description of the backing portion 11 is omitted.

The packaging container 1 includes an outer container 2 and an inner container 3 housed inside the outer container 2.

The outer container 2 is a rectangular parallelepiped box-shaped paper container formed of a sheet material containing at least a paper base material and a sealant layer on the outermost surface. Although details will be described later, the outer container 2 is formed into a rectangular parallelepiped shape by temporarily forming a pillow-shaped container from a sheet material that is rolled into a tubular shape and pasted on the back, and the upper and lower flaps of the pillow-shaped container are folded. It is formed by. The formed outer container 2 has a top surface portion 6, a bottom portion 7, and a peripheral wall portion 8. The flaps 9a and 9b at the upper part of the outer container 2 are bent toward the peripheral wall portion 8 (side surface side) and sealed to the peripheral wall portion 8, or are adhered with an adhesive such as hot melt. On the other hand, the flaps 10a and 10b at the lower part of the outer container 2 are bent toward the bottom 7 side and adhered to the bottom 7 with a seal or an adhesive. Further, the outer container 2 is formed with a back sticking portion 11 when the sheet material is rolled into a tubular shape and stuck together, and seal portions 12a and 12b when the pillow type container is formed, respectively.

As the material of the sealant layer of the sheet material, polyethylene (for example, LLDPE, LDPE), modified polyethylene, polypropylene, (meth) acrylic acid copolymer (for example, EMAA, EAA), (meth) acrylic acid ester copolymer (for example, for example). EMA, EMMA), ionomer, etc. can be used. The sealant layer is preferably provided on both sides of the sheet material. In addition to the paper base material and the sealant layer, the sheet material may be further provided with a resin film such as a PET film or a printing layer. When the print layer is provided, it may be provided outside the sealant layer, or may be provided between the sealant layer and the paper layer.

The inner container 3 is a pouch (pillow bag) formed of a laminated film including at least a barrier layer and a sealant layer on the outermost surface, and is filled with a liquid content 4 such as soft drink. The inner container 3 is sealed only to a part of the top plate portion 6 and the bottom portion 7 inside the outer container 2. More specifically, as shown in FIG. 2, the two laminated films overlapping at the upper end edge portion of the inner container 3 are sandwiched and sealed between the two sheet materials constituting the outer container 2, and the inner container is sealed. The two laminated films overlapping at the lower end edge portion of No. 3 are sandwiched and sealed between the two sheet materials constituting the outer container 2. Therefore, the top surface portion 6 and the bottom portion 7 of the packaging container are formed with sealing portions 12a and 12b in which the two laminated films and the two sheet materials are commonly sealed. The inner container 3 is not sealed on the peripheral wall portion 8 of the outer container 2.

As the barrier layer of the laminated film, a metal foil such as aluminum, an aluminum vapor-deposited PET film, a transparent vapor-deposited PET film on which aluminum oxide or silicon oxide (SiO _X ) is vapor-deposited can be used. As the sealant layer of the laminated film, the resin exemplified in the sealant layer of the sheet material can be used. Sealant layers are provided on both sides of the laminated film. Specific examples of the layer structure of the laminated film include PE / transparent vapor deposition PET / PE, PE / NY / transparent vapor deposition PET / PE, PE / aluminum vapor deposition PET / PE, PE / NY / aluminum vapor deposition PET / PE, PE / NY. / Aluminum / PE. As polyethylene, LLDPE and LDPE can be preferably used. Further, instead of polyethylene, modified polyethylene, polypropylene, (meth) acrylic acid copolymer (for example, EMAA, EAA), (meth) acrylic acid ester copolymer (for example, EMA, EMMA), ionomer and the like may be used.

Hereinafter, the method for manufacturing the packaging container according to the embodiment will be described with reference to FIGS. 3 and 4.

FIG. 3 is a schematic view showing a method for manufacturing a packaging container according to an embodiment, and FIG. 4 is a cross-sectional view taken along the IV-IV line shown in FIG.

First, as shown in FIG. 3, the sheet material 21 for forming the outer container 2 and the laminated film 22 for forming the inner container are overlapped and conveyed from above to below. In FIG. 3, the laminated film 22 is arranged in front of the sheet material 21. The sheet material 21 of the outer container 2 is preliminarily subjected to a creaking process at a portion that becomes a crease during molding into a box shape. The creaking process may be performed in-line between the unwinding of the original roll and the backing. Alternatively, the sheet material 21 may be subjected to a creaking process at the time of manufacturing the raw fabric roll, and then the sheet material may be wound up to form the raw fabric roll.

Next, the laminated film 22 on the front side is rolled into a tubular shape, and both end edges of the laminated film 22 are overlapped and sealed to form the backing portion 13. At this time, the edge portions of both ends of the laminated film 22 may be overlapped in the front-rear direction and attached to the envelope, or the laminated film 22 may be abutted in a gassho shape and attached in the gassho.

Next, the sheet material 21 on the back side is rolled into a tubular shape so as to surround the tubular laminated film 22 attached to the back, and both end edges of the sheet material 21 are overlapped and sealed to form the back attachment portion 11. At this time, the edge portions of both ends of the sheet material 21 may be overlapped in the front-rear direction and attached to the envelope, or the sheet material 21 may be abutted in a gassho shape and attached in the gassho. By pasting the sheet material 21 on the back, a double tube 23 in which the tubular laminated film 22 is housed is formed in the tubular sheet material 21.

As described with reference to FIGS. 1 and 2, since the liquid content is sealed in the inner container 3 and does not come into direct contact with the inner surface of the outer container 2, the edge portion that becomes the inner side when the sheet material 21 is attached to the envelope. Does not necessarily have to be edge-protected. However, if necessary, edge protection processing may be applied to the inner edge portion of the sheet material 21 when the envelope is attached. Edge protection can be performed by laminating edge protection tape or skive hemming processing.

Next, the inside of the tubular laminated film 22 is filled with the liquid content 4 from the filling nozzle 24. When the content 4 is filled, the lower portion of the double tube 23 is sealed by the seal portion 12b.

Next, as shown in FIG. 4, the double tube 23 filled with the content 4 is sandwiched between the seal bars 25a and 25b and sealed in the transverse direction of the double tube. At the same time as sealing, the inside of the sealing area is cut in the width direction by the cutter 26 built in the sealing bar 25a, whereby the pillow type container 27 filled with the contents 4 is formed. The cut of the seal portion may be performed after the seal, not at the same time as the seal.

Then, the sheet material is bent at the creases formed in the sheet material by the creaking process to form a brick shape, and the flaps 9a and 9b and the flaps 10a and 10b are sealed or bonded in a folded state, as shown in FIG. The packaging container 1 is completed.

As described above, in the packaging container 1 according to the present embodiment, the inner container 3 and the outer container 2 are not sealed except for the sealing portions 12a and 12b that are inevitably generated when the brick pattern container is formed. That is, since the packaging container 1 according to the present embodiment can use different materials that are not bonded to the laminated film 22 of the inner container 3 and the sheet material 21 of the outer container 3, it is necessary when molding the packaging container 1. The creaking process for forming a smooth crease can be performed only on the sheet material 21 of the outer container 3. Therefore, there is no possibility that the laminated film 22 having the barrier layer will be damaged by the creaking process. Therefore, according to the present invention, damage to the barrier layer is suppressed, and a packaging container 1 having excellent barrier properties can be realized.

Further, the packaging container 1 according to the present embodiment can be manufactured only by adding a step of backing a laminated film to the conventional manufacturing process of a brick paper container, so that the existing manufacturing equipment is significantly changed. It becomes possible to manufacture without.

(First modification)
FIG. 5 is a perspective view of the packaging container according to the first modification.

The packaging container 15 according to the modified example is a packaging container 1 shown in FIG. 1 to which a spout 17 with a flange is further attached from the inside. Specifically, before the backing is performed, an opening for inserting the spout 17 is formed in both the sheet material and the laminated film, the spout is inserted from the laminated film side, and the flange of the spout and the laminated film are inserted. And the sheet material may be sealed. In this case, it is preferable to attach the spout to a place away from the back attachment portion 11 as shown in FIG. 5 so that the spout attached in the later back attachment step does not interfere.

In the packaging container 15 according to the first modification, by providing the spout 17, it is possible to facilitate pouring and resealing of the contents from the packaging container 15.

(Second modification)
FIG. 6 is a perspective view of the packaging container according to the second modification.

The packaging container 16 according to the second modification is a packaging container 1 shown in FIG. 1 to which a spout 18 having an opening mechanism is further attached. As the opening mechanism of the spout 18, a cylindrical opening blade is provided inside the spout, and the outer container 2 and the inner container 3 are cut by the opening blade as the cap rotates (for example, actual fairness). See No. 5-35058). When the packaging container 16 is provided with a spout 18 provided with an opening mechanism, it is preferable to put scratches, half cuts, or the like in the planned cutting portions so that the outer container 2 and the inner container 3 can be easily cut. Further, it is preferable that the sheet material of the outer container 2 and the planned cutting portion of the laminated film of the inner container 3 are mutually sealed and integrated so that the outer container 2 and the inner container 3 can be easily cut. When the sheet material of the outer container 2 and the planned cutting portion of the laminated film of the inner container 3 are mutually sealed, the sealing is performed before the backing of the laminated film is applied.

Also in the packaging container 16 according to the second modification, by providing the spout 18, it is possible to facilitate pouring and resealing of the contents from the packaging container 3.

(Other variants)
In the packaging container 1 shown in FIG. 1, a straw hole may be provided to facilitate the piercing of the straw, or a scratching process, a half cut, or the like may be made at the planned piercing portion of the straw. When the planned piercing location of the straw is provided, it is preferable that the sheet material of the outer container 2 and the planned piercing location of the laminated film of the inner container 3 are mutually sealed and integrated so that the straw can be easily pierced.

Further, in the first and second modifications described above, a spout with a check valve may be provided as the spout. By providing the check valve, the intrusion of air into the inner container 3 during and after the injection of the contents is suppressed, so that deterioration of the contents due to oxidation or the like can be suppressed.

Hereinafter, examples of concrete implementation of the present invention will be described.

(Example)
Using the following layered sheet material and laminated film, the packaging container shown in FIG. 5 having a capacity of 1 liter was prepared. Specifically, an opening for creaking and inserting a spout was formed while unwinding the sheet material from the roll. Similarly, an opening for entering the mouth war was formed in the laminated film. As shown in FIG. 3, the backing was performed in the order of the laminated film and the sheet material while aligning the sheet material and the laminated film. The backing of the laminated film and the sheet material was a gassho pasting. The top and bottom of the container were sealed while filling the contents, and cutting was performed at the same time as the sealing. The obtained pillow-shaped container was molded to obtain a brick-shaped packaging container with a spout having the shape shown in FIG.

<Sheet material for outer container>
PE (20 μm thickness) / Paper (350 g / m ² ) / PE (20 μm thickness)
<Laminated film for inner container>
PE (50 μm thickness) / Silica vapor deposition PET (12 μm thickness) / PE (50 μm thickness)

(Comparison example)
Using the sheet material having the following layer structure, a brick-type packaging container with a spout having the shape shown in FIG. 5 was obtained by the same method as the processing method of the sheet material of the example.

<Sheet material of comparative example>
PE (20 μm thickness) / Paper (350 g / m ² ) / PE (20 μm thickness) / Silica-deposited PET (12 μm thickness) / PE (50 μm thickness)

(Evaluation)
A sample in which 150 g of calcium chloride was sealed as the content in each of the packaging containers obtained in Examples and Comparative Examples was stored in a high-temperature and high-humidity tank at 40 ° C. and 90% RH for 1 month, and the amount of weight change before and after storage was measured. It was measured. In the sample using the packaging container according to the example, the weight increase per month was 0.5 g, whereas in the sample using the packaging container according to the comparative example, the weight increase per month was 0.5 g. The weight increase of was 3.0 g. As a result, it was confirmed that higher barrier performance can be obtained in the packaging container according to the example.

In addition, a sample was prepared in which wine was filled as a content in each of the packaging containers obtained in Examples and Comparative Examples and sealed. After opening the sample and taking out half of the sample, the sample resealed with a spout was stored at 40 ° C. for 2 weeks. The wine stored in the packaging container according to the example and the wine stored in the packaging container according to the comparative example were sensory evaluated by 10 panelists by a three-point identification method.
A difference was observed between the wine stored in the packaging container of the example and the wine stored in the packaging container of the comparative example at a risk rate of 1%, and the taste of the wine stored in the packaging container of the example was relatively higher. It was confirmed that it was good.

The present invention can be used as a packaging container for filling liquid or gel-like contents such as soft drinks and dairy products.

1 Packaging container 2 Outer container 3 Inner container 6 Top surface 7 Bottom 8 Peripheral wall 21 Sheet material 22 Laminated film

Claims (3)

It ’s a packaging container,
A box-shaped outer container composed of a sheet material containing at least a paper base material and a sealant layer on the outermost surface, and having a top surface portion, a bottom portion, and a peripheral wall portion.
It is composed of a laminated film containing at least a barrier layer and a sealant layer on both sides, and includes an inner container enclosed in the outer container.
The inner container is not sealed to the peripheral wall portion of the outer container, but is sealed only to a part of the top surface portion and the bottom portion of the outer container .
A packaging container having a common sealing portion on the top surface portion and the bottom portion of the outer container, in which two laminated films are laminated and commonly sealed between the two sheet materials . The outer container is a brick type container and
The inner container is Ru pouch der having a back lined portion, the packaging container according to claim 1. A method for manufacturing a box-shaped packaging container including an outer container and an inner container enclosed in the outer container.
The process of rolling and backing the laminated film containing at least the barrier layer and the sealant layers on both sides,
A process of forming creases by performing a creaking process on a sheet material containing at least a paper base material and a sealant layer on the outermost surface.
A step of forming a double tube by rolling and back-pasting the creaking sheet material so as to surround the laminated film that has been rolled and back-pasted.
Two sheets of the laminated film are laminated between the two sheet materials and commonly sealed in the transverse direction of the double tube, and the sealed area is cut in the transverse direction of the double tube to form a pillow type container. And the process to do
A method for manufacturing a packaging container, comprising a step of bending the pillow-shaped container at a crease formed by the creaking process to form a box shape.

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