JP4043544B2 - Packaging container - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a packaging container that does not adsorb components contained in the contents to be packaged, and does not cause a taste change or an unpleasant odor without elution into the contents to be packaged.
[0002]
[Prior art]
Conventionally, as a packaging bag with little adsorption of a specific component contained in contents used for packaging foods, medicines, cosmetics and the like containing various fragrances, spices, etc., for example, Japanese Patent Publication No. 2-4424 The surface contacting the contents of the packaging bag as described in the above has a solubility index of 9.0 for polyvinyl chloride, polyester, polymethacrylonitrile, ethylene-vinyl alcohol copolymer, polyvinylidene chloride, polyacrylonitrile, etc. The thing of the structure formed with the above synthetic resin is known. Also, a ceramic thin film layer is formed on the inner surface of a laminate for producing a packaging container, as described in JP-A-8-244663, and bonded to a portion to be a seal portion of the ceramic thin film layer surface. 2. Description of the Related Art A packaging container having a structure in which a ceramic thin film layer is formed as an inner surface with a partial adhesive layer using a laminate having a structure in which layers are partially provided is known.
[0003]
However, in the case of the packaging bag of the former configuration, synthesis of polyvinyl chloride, polyester, polymethacrylonitrile, ethylene-vinyl alcohol copolymer, polyvinylidene chloride, polyacrylonitrile, etc. used on the surface in contact with the contents of the packaging bag. Resin is not suitable for applications that require strong sealing strength, such as packaging bags for packaging liquids, because it has poor thermal adhesive properties such as sealing strength, hot tack, and low temperature sealing properties. Hot tack, low temperature sealing Not suitable for packaging containers that are packaged by automatic packaging machines that require properties etc. was there. Further, in the case of the latter packaging container, it is extremely difficult to provide a partial adhesive layer formed on the inner surface of the ceramic thin film layer as a thick layer, so that it is used for a packaging container that requires strong adhesive strength. When there is a level difference between the 4 layer part and the 2 layer part of the laminate, such as a pillow-type bag or a gusset bag, There was a drawback that it was very difficult to fill and seal the packaging container.
[0004]
[Problems to be solved by the invention]
The object of the present invention is excellent in heat bonding suitability such as sealing strength, low-temperature heat-sealing property, hot tack property, etc., has little adsorption of components contained in the packaged contents, and does not elute into the contents. An object of the present invention is to provide a packaging container that does not cause a change in taste or a strange odor.
[0005]
[Means for Solving the Problems]
A packaging container made of a laminate having an inner surface with a thermoplastic resin layer and thermally bonded with the thermoplastic resin layer, wherein a metal is formed in a region other than the thermal bonding portion on the surface of the thermoplastic resin layer Or a packaging container in which a metal oxide vapor deposition layer is formed, and the thermoplastic resin layer is excellent in heat bondability such as seal strength, low temperature heat seal property, hot tack property, etc. Since it is non-adsorptive, it can be set as the packaging container excellent in heat bondability and non-adsorptiveness.
[0006]
In the above packaging container, the laminate is configured by laminating a paper layer having a polyethylene layer on the outer surface or a base material layer made of a biaxially stretched plastic film and the thermoplastic resin layer, or the laminate. With a structure in which the base material layer, the gas barrier layer, and the thermoplastic resin layer are sequentially laminated, the thermal adhesion suitability and the non-adsorption property are excellent, and the gas barrier property is improved by the vapor deposition layer of metal or metal oxide. Since it is provided, it is possible to provide a packaging container for liquid packaging or solid packaging with excellent gas barrier properties.
[0007]
In the packaging container, the base material layer is a paper layer having a polyethylene layer on the outer surface, and the gas barrier layer is an aluminum-deposited biaxially stretched plastic film or a laminate of aluminum foil and biaxially stretched plastic film. By this, it is possible to obtain a packaging container, particularly a liquid packaging container, which has excellent thermal adhesion suitability and non-adsorption property and excellent gas barrier properties.
[0008]
In the packaging container, the base material layer is a biaxially stretched plastic film, and the gas barrier layer is an aluminum foil, an ethylene-vinyl alcohol copolymer, polyvinylidene chloride, a polyvinylidene chloride coated plastic film, It is possible to obtain a packaging container with excellent thermal bonding suitability, non-adsorption property, and gas barrier property and with excellent suitability for automatic packaging machines.
[0009]
In the above packaging container, by using the ethylene-α-olefin copolymer polymerized by using a single site catalyst as the thermoplastic resin layer, a packaging container having excellent low-temperature sealability can be obtained.
[0010]
In the packaging container, the design property and workability during production can be improved by adopting a configuration in which a printing layer is provided on the outer surface of the base material layer.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view showing a blank plate of a gobeltop-type container according to a first embodiment of the packaging container of the present invention, FIG. 2 is a cross-sectional view taken along line II in FIG. 1, and FIG. 4 is a perspective view showing a pillow type bag according to a second embodiment, FIG. 4 is a plan view showing a continuous body in a developed state according to the second embodiment, FIG. 5 is a cross-sectional view taken along the line II in FIG. , 1a is a paper layer, 1b is a polyethylene layer, 2 is a gas barrier layer, 3 is a thermoplastic resin layer, 4 is a printing layer, 5 is a vapor deposition layer, 6,7 thermal bonding portions, 6a, 7a are thermal bonding regions, 8 Is a cut line, 11, 12, 13, 14 are side plates, 11a, 12a, 13a, 14a are top forming plates, 11b, 12b, 13b, 14b are bottom forming plates, 15 is an adhesive plate, 16 is a spout mounting hole , 17 is a top thermal bonding region, 18 and 20 are side edge thermal bonding regions, 19 is a bottom thermal bonding region, and 21 is a spout thermal bonding region.
[0012]
The first embodiment of the packaging container according to the present invention is a gobeltop type liquid packaging container. As shown in FIG. 1, the blank plate is formed by folding side plates 11, 12, 13, 14 and an adhesive plate 15. The top forming plates 11a, 12a, 13a, and 14a are connected to the upper portions of the side plates 11, 12, 13, and 14 via folding lines, respectively, and the side plates 11, 12, 13, and The bottom forming plates 11b, 12b, 13b, and 14b are connected to each other through folding lines at the lower part of 14, and the top forming plate 13a is formed with a spout mounting hole 16, and a blank plate is assembled and packaged. When the container is filled with the contents, the area in contact with the contents on the inner surface of the container, that is, the top thermal bonding area 17, the side edge thermal bonding areas 18, 20 and the bottom thermal bonding area 19 on the inner surface of the blank plate and the note. The vapor deposition layer 5 is formed except for the outlet heat bonding region 21.
[0013]
A cross-sectional view taken along the line II in FIG. 1 is as shown in FIG. 2, and a polyethylene layer 1b is laminated on the vapor deposition layer 5, the thermoplastic resin layer 3, the gas barrier layer 2, and the paper layer 1a in this order from the inner surface side of the packaging container. The base material layer 1 and the printing layer 4 are laminated. As the polyethylene layer 1b, high pressure method low density polyethylene, linear low density polyethylene, or the like is used. As the gas barrier layer 2, an aluminum vapor-deposited biaxially stretched plastic film or a laminate of an aluminum foil and a biaxially stretched plastic film is used. As the thermoplastic resin layer 3, a high pressure method low density polyethylene, a linear low density polyethylene, an ethylene-α olefin copolymer polymerized using a single site catalyst, or the like is used. By using an ethylene-α-olefin copolymer polymerized using a single site catalyst as the thermoplastic resin layer 3, it is possible to achieve excellent low-temperature thermal adhesion. As the biaxially stretched plastic film, a biaxially stretched polyethylene terephthalate film, a biaxially stretched nylon film, a biaxially stretched polypropylene film or the like is suitable. Since the vapor deposition layer 5 has an excellent gas barrier property, the gas barrier property can be obtained even when the gas barrier layer 2 is not used.
[0014]
As shown in FIG. 3, the second embodiment of the packaging container of the present invention is a pillow type packaging container, which is a region in contact with the contents on the inner surface of the packaging container, that is, the thermal bonding portions 6, 7. It is the structure by which the vapor deposition layer 5 was formed in the area | region except for. As shown in FIG. 4, the continuum in the unfolded state of the second embodiment is formed in the center portion except for the peripheral heat-bonding regions 6a and 7a on the inner surface when formed into a pillow type bag. The vapor deposition layer 5 is formed in a rectangular shape and forms a continuous body connected via a cut line 8.
[0015]
As shown in FIG. 5, the II sectional view in FIG. 4 is a configuration in which a vapor deposition layer 5, a thermal adhesive resin layer 3, a gas barrier layer 2, a base material layer 1, and a printing layer 4 are laminated in order from the inner surface. It is. As the thermoplastic resin layer 3, high pressure method low density polyethylene, linear low density polyethylene, ethylene-α olefin copolymer polymerized using a single site catalyst, ethylene-vinyl acetate copolymer, polypropylene, or the like is used. As the gas barrier layer 2, aluminum foil, aluminum vapor-deposited biaxially stretched plastic film, vinylidene chloride-coated biaxially stretched plastic film, ethylene-vinyl alcohol copolymer, or the like is used. As the base material layer 1, a biaxially stretched polyethylene terephthalate film, a biaxially stretched nylon film, a biaxially stretched polypropylene film or the like is used. In the case of the second embodiment, the gas barrier layer 2 can be eliminated and the substrate can be constituted by a laminate of the base material layer 1, the thermoadhesive resin layer 3, the vapor deposition layer 5, and the printing layer 4. Even in this configuration, the vapor deposition layer 5 acts as a gas barrier layer, so that excellent gas barrier properties can be obtained.
[0016]
As the metal or metal oxide constituting the vapor deposition layer 5, aluminum, aluminum oxide, silicon oxide, indium tin oxide or the like can be used. The vapor deposition layer 5 can be formed by a vacuum vapor deposition method, an ion plating method, a sputtering method, a plasma vapor deposition method, or the like. As the vapor deposition layer 5, one made of silicon oxide is particularly suitable. Silicon oxide is a mixture of silicon compounds represented by the general formula SixOy (X = 1, 2, Y = 0, 1, 2, 3) mainly composed of silicon monoxide. The thickness of the vapor deposition layer 5 is suitably 100 to 1000 mm. When the vapor deposition layer 5 is formed on the surface of the thermoplastic resin layer 3, the surface of the thermoplastic resin layer 3 may be surface-treated to about 38 dynes by corona discharge treatment or the like in order to increase the adhesive strength. You may give an anchor coat to the area | region which forms 5. FIG. A treatment degree of 38 dynes or more is not preferable because the thermal adhesiveness between the three surfaces of the thermoplastic resin layer deteriorates. When aluminum is used as the vapor deposition layer 5, the thickness of the aluminum vapor deposition layer is 1 to 5 μm in order to protect the aluminum vapor deposition surface against the contents and prevent the aluminum vapor deposition surface from being scratched by rubbing. A resin layer may be formed. It is preferable to make the resin layer as thin as possible.
[0017]
In order to partially form the vapor deposition layer 5 on the surface of the thermoplastic resin layer 3, a water-soluble layer is printed by printing using water-soluble ink in an area where the vapor deposition layer 5 on the surface of the thermoplastic resin layer 3 does not need to be formed. And a metal or metal oxide is vapor-deposited on the entire surface of the thermoplastic resin layer 3 on which the water-soluble layer is formed, and then the water-soluble layer is dissolved and removed. . In the case of a laminate including a paper layer as in the first embodiment, after forming the vapor deposition layer in a web state before laminating the paper layer, it is cut into a sheet shape at a predetermined position, and then the outer surface. In the case of a laminate that does not include a paper layer as in the second embodiment, after the laminate is produced by lamination, the pattern is applied to the outer surface of the laminate in a web state. It can be produced by providing a water-soluble layer on the back surface by printing and then providing a vapor-deposited layer on the front surface on the surface provided with the water-soluble layer and dissolving and removing the water-soluble layer.
[0018]
【Example】
Example 1
An ethylene-1-hexene copolymer (density: 0.910, MI: 2.10) obtained by polymerizing on one side of a 12 μm biaxially stretched polyethylene terephthalate film (PET) using a single site catalyst. A 30 μm thick film (SPE) made of 2) was extruded with low density polyethylene (LDPE) at a thickness of 30 μm and subjected to sand lamination to produce a laminated film of PET 12 μm / LDPE30 μm / SPE30 μm.
A water-soluble layer made of water-soluble ink is provided by printing on the SPE surface of the laminated film in a region where the phototube mark and the vapor deposition layer corresponding to the phototube mark at predetermined intervals are not formed, and the surface of the SPE surface on which the water-soluble layer is printed After vapor-depositing silicon oxide to a thickness of 500 mm on the entire surface, the water-soluble layer was dissolved and removed to obtain a laminated film in which a vapor-deposited layer of silicon oxide was formed in a predetermined region.
An aluminum foil (AL) having a thickness of 9 μm is laminated by dry lamination on the PET surface of the above laminated film on which a partially deposited layer is formed, and a laminated film consisting of AL9 μ / PET 12 μ / LDPE 30 μ / SPE 30 μ / partial silicon oxide deposition is produced. did.
On the other hand, LDPE was extrusion coated on one side of a 400 g / m ² paperboard to a thickness of 25 μm, and the other side of the paperboard and the vapor deposition surface of the laminated film on which the partial silicon oxide vapor deposition layer produced above was formed. Then, an ethylene-acrylic acid copolymer (EAA) is laminated by extrusion coating at a thickness of 20 μm, and a laminate having a structure of LDPE 25 μ / paperboard 400 g / EAA 20 μ / AL 9 μ / PET 12 μ / LDPE 30 μ / SPE 30 μ / partial silicon oxide vapor deposition is formed. Produced.
After this laminate is cut into sheets at the position of the photoelectric tube mark printed on the SPE surface, a predetermined pattern is printed on the outer surface of the LDPE by gravure printing, and then punching and box making steps To prepare a container for liquid packaging of a gable top type.
As a result of filling and storing orange juice in the above-prepared gobeltop type liquid packaging container, no change in the taste of orange juice was observed, and good results were obtained.
[0019]
Example 2
12μ thick biaxially stretched polyethylene terephthalate film (PET) and 9μ thick aluminum foil (AL) were laminated by extrusion lamination of 15μ thickness low density polyethylene (LDPE), and further 40μ by extrusion lamination on the AL surface. A linear film of low density polyethylene (LLDPE) was laminated to produce a laminated film of PET 12 μ / LDPE 15 μ / aluminum foil 9 μ / LLDPE 40 μ.
A predetermined printing pattern is provided on the PET surface of the laminated film by gravure printing, and at the same time, a predetermined region (when a packaging container is formed) that does not form a vapor deposition layer corresponding to the printing pattern of the PET surface on the opposite LLDPE surface. A water-soluble layer was formed using water-soluble ink in a region other than the heat-bonded portion.
After depositing silicon oxide to a thickness of 500 mm on the entire surface of the laminated film provided with the printed pattern and the water-soluble layer, the water-soluble layer made of water-soluble ink is dissolved and removed. Thus, a continuous film of a packaging container having a printed pattern on the outer surface and a partial vapor deposition layer corresponding to the printed pattern on the inner surface was prepared.
This film was used to fill a mineral water to produce a pillow type package. As a result of the storage test, there was no elution of off-flavors and the taste was good.
[0020]
【The invention's effect】
A packaging container made of a laminate having an inner surface with a thermoplastic resin layer and made by heat bonding with a thermoplastic resin layer, and a metal or metal in a region other than the heat bonding portion on the surface of the thermoplastic resin layer It is a packaging container having a structure in which an oxide vapor deposition layer is formed. In the case of this configuration, the packaging container is formed by heat bonding with the thermoplastic resin layer, so that the heat bonding suitability such as the sealing strength, the low temperature heat sealing property, the hot tack property is excellent, and the region other than the heat bonding part is Since it is non-adsorptive, it can be set as the packaging container provided with the outstanding heat bondability and non-adsorptivity.
In the above packaging container, the laminate is composed of a paper layer having a polyethylene layer on the outer surface or a base material layer made of a biaxially stretched plastic film and a thermoplastic resin layer, or a laminate. Since the material layer, the gas barrier layer, and the thermoplastic resin layer are laminated in order, the thermal adhesion suitability and non-adsorption property are excellent, and the gas barrier property is imparted by the metal or metal oxide deposition layer. In addition, a packaging container for liquid packaging or solid packaging with excellent gas barrier properties can be obtained.
In the packaging container described above, the base material layer is a paper layer having a polyethylene layer on the surface, and the gas barrier layer is an aluminum foil, an aluminum-deposited biaxially stretched plastic film, and a laminate of the aluminum foil and the biaxially stretched plastic film. Thus, a liquid packaging container having excellent heat bonding suitability, non-adsorption property and gas barrier property can be obtained.
In the above packaging container, the base material layer is a plastic film, and the gas barrier layer is an aluminum foil, an ethylene-vinyl alcohol copolymer, a vinylidene chloride coated plastic film. It can be set as the bag-like packaging container excellent in property.
In the above packaging container, by using an ethylene-α-olefin copolymer polymerized using a single site catalyst as the thermoplastic resin layer, a packaging container having excellent low-temperature sealability can be obtained.
In the packaging container, the workability at the time of production can be improved by adopting a configuration in which the printed layer is provided on the outer surface of the base material layer.
[Brief description of the drawings]
FIG. 1 is a plan view showing a blank plate of a gobeltop container of a first embodiment of a packaging container of the present invention.
2 is a cross-sectional view taken along the line II in FIG.
FIG. 3 is a perspective view showing a pillow type bag according to a second embodiment of the packaging container of the present invention.
FIG. 4 is a plan view showing a continuum in a developed state according to a second embodiment.
5 is a cross-sectional view taken along the line II in FIG.
[Explanation of symbols]
1 Base material layer 6a, 7a Thermal bonding area
1a Paper layer 8 Cut line
1b Polyethylene layer 11, 12, 13, 14 Side plate 2 Gas barrier layer 11a, 12a, 13a, 14a Top forming plate 3 Thermoplastic resin layer 11b, 12b, 13b, 14b Bottom forming plate 4 Print layer 15 Adhesive plate 5 Deposition layer 16 Outlet mounting holes 6, 7 Thermal bonding area 17, 18, 19, 20, 21 Thermal bonding area

Claims (5)

In order from the inside, a partial vapor deposition layer, a heat seal layer made of a plastic film having a thermoplastic resin layer on the inner surface , a gas barrier layer, a base material layer made of a paper layer having a polyethylene layer on the outer surface, and a printing layer, The partial vapor deposition layer formed by directly depositing a metal or metal oxide on the inner surface of the thermoplastic resin layer, which is limited to a region other than the thermal bonding portion, is formed as a content. The innermost surface is in direct contact with the inner surface of the thermoplastic resin layer, and the region where the partial vapor deposition layer is not formed is formed as a thermal bonding portion, and is manufactured by thermal bonding at the thermal bonding portion of the thermoplastic resin layer. a packaging container to be, the packaging container is, to produce a web of plastic film to form a thermoplastic resin layer on the inner surface constituting the heat seal layer, the web of plastic film Thermoplastic in which a water-soluble layer is formed using a water-soluble ink in a region where a phototube mark at a predetermined interval and a partial vapor deposition layer corresponding to the phototube mark are not formed on the surface of the plastic resin layer by gravure printing After vapor-depositing metal or metal oxide on the entire surface of the resin layer, by dissolving and removing the water-soluble layer made of water-soluble ink, phototube marks at a predetermined interval, and partial vapor deposition layers and heat seal layers corresponding to the phototube marks Are laminated, a gas barrier layer and a base material layer are laminated on the laminated film, a photoelectric tube mark having a predetermined interval, a partial vapor deposition layer corresponding to the photoelectric tube mark, a heat seal layer, and a gas barrier layer A web-like laminate in which the substrate layer and the substrate layer are laminated, and this web-like laminate is cut at a predetermined position with respect to the position of the photoelectric tube mark as a single sheet product. After the body, packing container this sheet to form a printing layer on the polyethylene layer of the thalli laminate is then characterized in that to produce performing punching, the box making process. The thermoplastic resin layer is composed of a laminate in which a partial vapor deposition layer, a thermoplastic resin layer, a gas barrier layer, a base material layer made of a biaxially stretched plastic film, and a printing layer are laminated in order from the inside. The partial vapor deposition layer formed by directly depositing a metal or metal oxide limited to a region other than the heat-bonded portion on the inner surface of the inner surface is the innermost surface directly in contact with the contents, and the thermoplastic resin layer A region of the inner surface where the partial vapor deposition layer is not formed is a thermal bonding portion, and is a packaging container manufactured by thermal bonding at the thermal bonding portion of the thermoplastic resin layer. A web-like laminated film in which a thermoplastic resin layer, a gas barrier layer, and a base material layer are laminated is produced, and at the same time a printed layer is formed by gravure printing on the biaxially stretched plastic film surface of this web-like laminated film. A water-soluble layer is formed using a water-soluble ink in a region where a partially deposited layer is not formed by gravure printing on the surface of the thermoplastic resin layer of the web-like laminated film, and a metal or a metal or After vapor deposition of metal oxide, by dissolving and removing a water-soluble layer made of water-soluble ink, a web in which a partially vapor-deposited layer, a thermoplastic resin layer, a gas barrier layer, a base material layer, and a printing layer are laminated A packaging container, which is produced using a web-like laminate . The packaging container according to claim 1, wherein the gas barrier layer is made of an aluminum-deposited biaxially stretched plastic film or a laminate of an aluminum foil and a biaxially stretched plastic film. The packaging container according to claim 2, wherein the gas barrier layer is made of any one of an aluminum foil, an ethylene-vinyl alcohol copolymer, polyvinylidene chloride, and a polyvinylidene chloride-coated plastic film. The packaging container according to claim 1, wherein the thermoplastic resin layer is made of an ethylene-α-olefin copolymer polymerized using a single site catalyst.

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