JP2017214131A - Packaging container and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packing container which suppresses a barrier layer from being damaged and has superior barrier properties.SOLUTION: A packing container 1 comprises a box-shaped outer container 2 having a top surface part 6, a bottom part 7 and a peripheral wall part 8, and an inner container 3 encapsulated in the outer container 2. The outer container 2 is formed of at least a paper base material and a sheet material including a sealant layer on an outermost surface. The inner container 3 is formed of at least a barrier layer and a laminate film including sealant layers on both surfaces. The inner container 3 is not sealed to a peripheral wall part 8 of the outer container 2, but sealed only to the top surface part 6 and bottom part 7 of the outer container 2.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a packaging container for filling liquids such as soft drinks and dairy products.

  Patent Document 1 describes a brick-type paper container provided with a straw. The paper container described in Patent Document 1 is sealed and cut in a direction crossing the cylindrical packaging material after sealing the belt-shaped packaging material provided with thermoplastic resin on both sides into a cylindrical shape and filling the contents. It is manufactured by forming a pillow-shaped prototype container and then folding the flap portion of the prototype container into a rectangular parallelepiped shape. The wrapping material is preliminarily provided with a fold so that the flap portion can be easily folded and molded from the original container.

JP2013-13526A

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

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

  A packaging container according to the present invention comprises a sheet material including at least a paper base material and an outermost sealant layer, a box-shaped outer container having a top surface portion, a bottom portion, and a peripheral wall portion, and at least a barrier layer and both surfaces. The inner container is composed of a laminated film including a sealant layer and is enclosed in the outer container. The inner container is not sealed to the peripheral wall portion of the outer container, and is sealed only to the top and bottom portions of the outer container. It is what is done.

  Moreover, this invention relates to the manufacturing method of a box-shaped packaging container provided with the outer side container and the inner side container enclosed with an outer side container. The manufacturing method according to the present invention includes a step of rolling and laminating a laminated film including at least a barrier layer and double-sided sealant layers and performing a cleaning process on a sheet material including at least a paper base material and an outermost sealant layer. A step of forming a crease, a step of forming a double tube by rolling and pasting a sheet material that has been subjected to a cleaning process so as to surround a laminated film that has been rolled back and pasting, and a sheet of two sheets In the process of forming a pillow-type container and the crease formed by the cleaning process, the two laminated films are stacked and sealed together in the transverse direction of the double tube, and the sealed area is cut in the transverse direction of the double tube. And a step of bending the pillow container into a box shape.

  ADVANTAGE OF THE INVENTION According to this invention, the damage to a barrier layer is suppressed and the packaging container excellent in barrier property and its manufacturing method can be provided.

The perspective view of the packaging container which concerns on embodiment Sectional view along the II-II line shown in FIG. Schematic which shows the manufacturing method of the packaging container which concerns on embodiment Sectional drawing which follows the IV-IV line shown in FIG. The perspective view of the packaging container which concerns on a 1st modification The perspective view of the packaging container which concerns on a 2nd modification

  FIG. 1 is a perspective view of a 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, the back pasting portion 11 is omitted for simplification.

  The packaging container 1 includes an outer container 2 and an inner container 3 accommodated in the outer container 2.

  The outer container 2 is a rectangular parallelepiped box-shaped paper container formed of a sheet material including at least a paper base material and an outermost sealant layer. As will be described in detail later, the outer container 2 is formed into a rectangular parallelepiped shape by temporarily forming a pillow-type container from a sheet material rolled up into a cylindrical shape and pasted back, and then folding the upper and lower flaps of the pillow-type container. Is formed. The formed outer container 2 has a top surface portion 6, a bottom portion 7, and a peripheral wall portion 8. The upper flaps 9a and 9b of the outer container 2 are bent to the peripheral wall 8 side (side surface side) and sealed to the peripheral wall 8 or bonded with an adhesive such as hot melt. On the other hand, the lower flaps 10a and 10b of the outer container 2 are bent toward the bottom 7 and bonded to the bottom 7 with a seal or an adhesive. In addition, the outer container 2 is formed with a back pasting part 11 when the sheet material is rolled and bonded together, and seal parts 12a and 12b when the pillow container is formed.

  In addition, as a 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, EMA, EMMA), ionomers and the like 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 further be provided with a resin film such as a PET film or a printing layer. When the printing 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 an outermost sealant layer, and is filled with a liquid content 4 such as a soft drink. The inner container 3 is sealed only to a part of the top plate part 6 and the bottom part 7 inside the outer container 2. More specifically, as shown in FIG. 2, the two laminated films that overlap at the upper 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 The two laminated films that overlap at the lower end edge portion 3 are sandwiched and sealed between the two sheet materials constituting the outer container 2. Accordingly, the top surface portion 6 and the bottom portion 7 of the packaging container are formed with seal portions 12a and 12b, respectively, in which two laminated films and two sheet materials are sealed in common. The inner container 3 is not sealed to 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, or the like can be used. The resin exemplified in the sealant layer of the sheet material can be used for the sealant layer of the laminated film. 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 deposited PET / PE, PE / NY / transparent vapor deposited PET / PE, PE / aluminum vapor deposited PET / PE, PE / NY / aluminum vapor deposited PET / PE, PE / NY. / Aluminum / PE. As polyethylene, LLDPE and LDPE can be used suitably. Further, in place of polyethylene, modified polyethylene, polypropylene, (meth) acrylic acid copolymer (for example, EMAA, EAA), (meth) acrylic acid ester copolymer (for example, EMA, EMMA), ionomer, or the like may be used.

  Hereinafter, the manufacturing method of the packaging container which concerns on embodiment is demonstrated, referring FIG.

  FIG. 3 is a schematic view showing a method for manufacturing a packaging container according to the embodiment, and FIG. 4 is a cross-sectional view taken along the line IV-IV 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 disposed in front of the sheet material 21. The sheet material 21 of the outer container 2 is preliminarily subjected to a cleaning (streaking) process at a portion that becomes a fold when being formed into a box shape. The cleaning process may be performed in-line between the unwinding of the raw roll and the back sticking. Alternatively, at the time of manufacturing the raw fabric roll, the sheet material 21 may be subjected to a cleaning process, and then the sheet material may be wound to form the original fabric roll.

  Next, the laminated film 22 on the near side is rolled into a cylindrical shape, and both end portions of the laminated film 22 are overlapped and sealed to form the back pasting portion 13. At this time, both end edge portions of the laminated film 22 may be overlapped and pasted on an envelope, or may be affixed in a palm-like manner.

  Next, the back side sheet material 21 is rounded into a cylindrical shape so as to surround the back laminated cylindrical laminated film 22, and both end portions of the sheet material 21 are overlapped and sealed to form the back pasted portion 11. At this time, the both edge portions of the sheet material 21 may be overlapped and pasted in an envelope, or may be abutted and pasted in a palm shape. By sticking back the sheet material 21, a double tube 23 in which a cylindrical laminated film 22 is accommodated in the cylindrical sheet material 21 is formed.

  1 and 2, the liquid content is enclosed in the inner container 3 and does not directly contact the inner surface of the outer container 2, so that the edge portion that becomes the inner side when the envelope of the sheet material 21 is pasted It is not always necessary to perform edge protection processing. However, if necessary, edge protection processing may be applied to the inner edge portion when the envelope of the sheet material 21 is attached. Edge protection can be performed by bonding edge protection tape or by skive hemming.

  Next, the liquid content 4 is filled into the cylindrical laminated film 22 from the filling nozzle 24. When the contents 4 are 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 contents 4 is sandwiched between seal bars 25a and 25b and sealed in the transverse direction of the double tube. Simultaneously with the sealing, the inside of the sealing region is cut in the width direction by the cutter 26 built in the sealing bar 25a, whereby the pillow container 27 filled with the contents 4 is formed. The cutting of the seal portion may be performed after the seal, not at the same time as the seal.

  Thereafter, the sheet material is folded at the crease formed in the sheet material by the creasing process and formed into a brick shape, and the flaps 9a and 9b and the flaps 10a and 10b are folded or sealed or bonded 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 seal portions 12a and 12b that are inevitably generated when the brick type paper container is formed. That is, the packaging container 1 according to the present embodiment can use separate 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, and therefore is necessary when molding the packaging container 1. A creasing process for forming a 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 is damaged by the cleaning process. Therefore, according to this invention, the damage to a barrier layer is suppressed and the packaging container 1 excellent in barrier property is realizable.

  Moreover, since the packaging container 1 which concerns on this embodiment can be manufactured only by adding the process of sticking a laminated film back to the manufacturing process of the conventional brick type | mold paper container, changing existing manufacturing equipment significantly. Manufacturing becomes possible.

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

  The packaging container 15 which concerns on a modification further attaches the stopper 17 with a flange from the inner side to the packaging container 1 shown in FIG. Specifically, before performing the back pasting, an opening for inserting the plug 17 is formed in both the sheet material and the laminated film, the plug is inserted from the laminated film side, the flange of the plug and the laminated film And the sheet material may be sealed. In this case, it is preferable to attach the spout at a location away from the back pasting portion 11 as shown in FIG. 5 so that the spout attached in the subsequent back pasting step does not interfere.

  In the packaging container 15 according to the first modified example, by providing the plug 17, it is possible to easily pour out and reseal the contents from the packaging container 15.

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

  The packaging container 16 according to the second modification is obtained by attaching a stopper 18 having an opening mechanism to the packaging container 1 shown in FIG. As the opening mechanism of the spout 18, a structure having a cylindrical opening blade inside the spout and cutting the outer container 2 and the inner container 3 with the opening blade as the cap rotates can be used (for example, actual fairness) No. 5-35058). When providing the stopper 18 provided with the opening mechanism in the packaging container 16, it is preferable to put a scratch process, a half cut, etc. in the planned cutting part so that the outer container 2 and the inner container 3 can be easily cut. Moreover, it is preferable to seal and integrate the sheet material of the outer container 2 and the scheduled cutting position of the laminated film of the inner container 3 so that the outer container 2 and the inner container 3 can be easily cut. In the case where the sheet material of the outer container 2 and the scheduled cutting position of the laminated film of the inner container 3 are sealed to each other, the sealing is performed before the laminated film is back-attached.

  Also in the packaging container 16 according to the second modified example, by providing the plug 18, it is possible to easily pour out and reseal the contents from the packaging container 3.

(Other variations)
In addition, in the packaging container 1 shown in FIG. 1, in order to make a straw easy to stab, a straw hole may be provided or a scratch process, a half cut, etc. may be put in the planned stab place of a straw. In the case where a straw puncture planned portion is provided, it is preferable that the sheet material of the outer container 2 and the planned piercing portion of the laminated film of the inner container 3 are mutually sealed and integrated so that the straw can be easily pierced.

  In the first and second modifications, a plug with a check valve may be provided as the plug. By providing the check valve, since the intrusion of air into the inner container 3 is suppressed at the time of and after the content is poured out, deterioration of the content due to oxidation or the like can be suppressed.

  Examples in which the present invention is specifically implemented will be described below.

(Example)
The packaging container shown in FIG. 5 having a capacity of 1 liter was produced using the following layer-constituting sheet material and laminated film. Specifically, an opening for cleaning and plug insertion was formed while unwinding the sheet material from the roll. Similarly, an opening for a mouth war was formed in the laminated film. While aligning the sheet material and the laminated film, back lamination was performed in the order of the laminated film and the sheet material as shown in FIG. Back lamination of the laminated film and the sheet material was performed with a palm joint. 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 resulting pillow-type container was molded to obtain a brick-type packaging container with a cap having the shape shown in FIG.

<Outer container sheet material>
PE (20 μm thickness) / paper (350 g / m ² ) / PE (20 μm thickness)
<Laminated film for inner container>
PE (50 μm thickness) / Silica-deposited PET (12 μm thickness) / PE (50 μm thickness)

(Comparative example)
Using the sheet material having the following layer structure, a brick-type packaging container with a cap having the shape shown in FIG. 5 was obtained in the same manner as the sheet material processing method 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)
In each of the packaging containers obtained in the examples and comparative examples, a sample in which 150 g of calcium chloride is encapsulated as a content is stored for one month in a high-temperature and high-humidity tank of 40 ° C. and 90% RH, and the amount of change in weight before and after storage is measured. It was measured. In the sample using the packaging container according to the example, the weight increase per month per packaging was 0.5 g, whereas in the sample using the packaging container according to the comparative example, one month per packaging. Weight increase was 3.0 g. Thereby, in the packaging container which concerns on an Example, it was confirmed that higher barrier performance is obtained.

In addition, each of the packaging containers obtained in the examples and comparative examples was filled with wine as the contents and sealed. The sample was opened and half of the sample was taken out, and then resealed with a cap and stored at 40 ° C. for 2 weeks. Ten panelists performed sensory evaluation on the wine stored in the packaging container according to the example and the wine stored in the packaging container according to the comparative example by a three-point identification method.
A difference between the wine stored in the packaging container of the example and the wine stored in the packaging container of the comparative example is recognized with a risk rate of 1%, and the taste of the wine stored in the packaging container of the example is relatively It was confirmed that it was good.

  INDUSTRIAL APPLICATION This invention can be utilized as a packaging container filled with liquid or gel-like contents, such as a soft drink and dairy products.

DESCRIPTION OF SYMBOLS 1 Packaging container 2 Outer container 3 Inner container 6 Top surface part 7 Bottom part 8 Perimeter wall part 21 Sheet material 22 Laminated film

Claims (3)

A packaging container,
A box-shaped outer container comprising a sheet material including at least a paper base material and an outermost sealant layer, and having a top surface portion, a bottom portion, and a peripheral wall portion;
An inner container made of a laminated film including at least a barrier layer and sealant layers on both sides, and enclosed in the outer container;
The inner container is not sealed to the peripheral wall portion of the outer container, and is sealed only to a part of the top surface portion and the bottom portion of the outer container. The outer container is a brick container;
The inner container is a pouch having a back pasting part,
The packaging container of Claim 1 which has a common seal part which piled up the said 2 laminated | multilayer film between the said 2 sheet | seat materials, and carried out the common seal | sticker in the said top surface part and the said bottom part of the said outer container. A method of manufacturing a box-shaped packaging container comprising an outer container and an inner container enclosed in the outer container,
A step of rolling and laminating a laminated film including at least a barrier layer and sealant layers on both sides;
A step of forming a fold by performing a cleaning process on a sheet material including at least a paper base material and an outermost sealant layer;
The step of forming the double tube by rounding and pasting the sheet material that has been subjected to the creasing process so as to surround the laminated film that has been rounded and back-paste;
Two laminated films are overlapped between the two sheet materials and sealed in common in the transverse direction of the double tube, and the sealed region is cut in the transverse direction of the double tube to form a pillow type container. And a process of
And a step of bending the pillow container at a crease formed by the creasing process and forming the container into a box shape.

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