JP2018126950A - Laminate and packaging container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent pinholes from being generated between a cut portion provided in a paper base material layer and a barrier layer by heating when melting a sealant layer, and a laminate. A packaging container using this is provided. SOLUTION: The laminated body includes a paper base material layer, a resin layer, and a barrier layer in this order, and has a linear fragile portion. The fragile portion is formed in the paper base material layer. The perforations are composed of perforations in which non-open cuts are intermittently formed and dot-processed lines in which dot-shaped holes are linearly arranged in the barrier layer, and the perforations are viewed in a plan view. Is formed on the dot processing line. Further, the packaging container is formed by sealing the end portion of the above-mentioned laminated body bent into a box shape. [Selection diagram] Fig. 3

Description

  The present invention relates to a laminate and a packaging container using the same.

  As described in Patent Document 1, a layer having a barrier property such as an aluminum foil, an aluminum vapor-deposited film, or an inorganic oxide vapor-deposited film is laminated between a paper base material layer and a thermoplastic resin sealant layer. 2. Description of the Related Art A packaging container is known that is formed by folding a simple laminate into a box shape and overlapping and sealing the ends.

  Patent Document 2 discloses a cylindrical shape formed by using a laminate in which a thermoplastic resin layer, a paper base material, a barrier layer, and a sealant layer are sequentially laminated from the outer layer side toward the inner layer side. A paper container provided with a body portion, which is a paper container obtained by scratching a base film of a paper base material and a barrier layer, is disclosed. This paper container can be easily disassembled because the side plate of the body portion can be cut off by using the scratched portion as a trigger.

JP 2003-335362 A Japanese Patent Laying-Open No. 2015-193416

  The paper container of Patent Document 2 is formed, for example, by melting the end portion of the sealant layer of the laminate with hot air or the like, then bending the laminate into a box shape and overlapping the ends to seal. In the paper container formed in this way, when the sealant layer is heated with hot air, the sealant layer softens or the air or water vapor contained in the paper substrate expands, and the paper substrate and the barrier layer When pinholes are generated between the cuts (scratched parts) and the two communicate with each other, the content liquid may leak through the cuts.

  The present invention has been made in view of such problems, and can suppress the occurrence of pinholes between the cut portions provided in the paper base material layer and the barrier layer by heating when melting the sealant layer. It aims at providing a laminated body and a packaging container using the same.

  One aspect of the present invention for solving the above-described problem is a laminate including a paper base layer, a resin layer, and a barrier layer in this order, and including a linear weak portion, and the weak portion is a paper It is composed of perforations formed in the base material layer, in which notched openings that are not open are formed intermittently, and dot processing lines formed in the barrier layer, in which dotted holes are arranged in a line, A perforation is a laminated body formed on a dot processing line in a plan view.

  Moreover, the other situation of this invention is the packaging container formed by sealing the edge part of the above-mentioned laminated body bent in the box shape.

  According to the present invention, there is provided a laminate and a packaging container using the same, which can suppress the occurrence of pinholes between the cut portions provided in the paper base material layer and the barrier layer by heating when the sealant layer is melted. Can be provided.

The perspective view of the packaging container which concerns on one Embodiment of this invention The top view of the blank of the packaging container concerning one embodiment of the present invention Sectional drawing which shows the laminated structure of the laminated body which concerns on one Embodiment of this invention. Sectional drawing which shows the laminated structure of the laminated body which concerns on a modification Sectional drawing which shows the notch part structure of the laminated body which concerns on a reference example Sectional drawing which shows the cut | notch part structure of the laminated body which concerns on a modification Sectional drawing which shows the laminated structure of the laminated body which concerns on a modification Sectional drawing which shows the laminated structure of the laminated body which concerns on a modification

  Below, the packaging container which concerns on one Embodiment of this invention, and its modification are demonstrated with reference to drawings. In the modification, the description of elements that are the same as or correspond to those in the embodiment will be omitted as appropriate.

(Packaging container)
In FIG. 1, the perspective view of the packaging container 1 which concerns on embodiment of this invention is shown. The packaging container 1 includes a container body 100 formed by bending a blank 10 obtained by processing a laminated body by a method such as punching into a box shape and overlaying and sealing the ends, and a spout serving as a resin pouring tool A stopper 104 is provided. The container main body 100 includes a top portion 101 that is an upper portion when standing upright, a body portion 102 that is a side surface, and a bottom portion 103 that is a lower portion, and the top portion 101 includes two roof plates 106 (106a and 106b) and a roof plate. A folding plate 107 and a folding plate 108 that are folded between 106 are included. A circular pouring hole 112 is formed in the roof plate 106a. The spout stopper 104 includes a spout 104 a and a cap 104 b and is attached to the spout hole 112. The body portion 102 is composed of four side plates 109. In the vicinity of the top portion 101 of the side plate 109, a fragile portion 105 having a reduced breaking strength is formed in the width direction, which is the left-right direction when the container body 100 is erected.

(blank)
In FIG. 2, the top view of the blank 10 which is an example of the blank used as the raw material of the container main body 100 is shown. The blank 10 includes roof plates 106a and 106b constituting the top portion 101, folding plates 107 and folded plates 108, four side plates 109 constituting the trunk portion 102, a bottom plate 110 constituting the bottom portion 103, and end portions. And a formed seal portion 111. The container main body 100 is formed by bending the blank 10 in accordance with a one-dot chain line in FIG. 2 and sealing a seal portion 111, which will be described later, with a hot air or the like and melting a sealant layer 206 on the opposite side. . A pouring hole 112 for inserting and fixing the spout plug 104 is formed near the center of the roof plate 106a. Near the top portion 101 of the side plate 109, a linear fragile portion 105 is formed on substantially the entire circumference over the width direction that is the left-right direction when the container body 100 is erected. As will be described later, the fragile portion 105 includes a perforation 207a and a dot processing line 207b formed in the laminate 20 used in the blank 10.

(Laminate)
In FIG. 3, sectional drawing which represents typically the laminated structure of the laminated body 20 which concerns on one Embodiment of this invention is shown. As shown in FIG. 3, the laminate 20 is composed of a thermoplastic resin layer 201 / paper substrate layer 202 / adhesive resin layer 203 / barrier layer 204 / adhesive layer 205 in order from the outside to the inside of the packaging container 1. / Sealant layer 206 is laminated. In addition, the laminate 20 includes a fragile portion 105 including a perforation 207 a formed in the paper base material layer 202 and a dot processing line 207 b formed in the barrier layer 204.

<Laminated structure>
The thermoplastic resin layer 201 can be formed on the paper base layer 202 by extrusion lamination or the like using a low density polyethylene resin (LDPE), a linear low density polyethylene resin (LLDPE), or the like. A print layer (not shown) may be provided outside the thermoplastic resin layer 201 to display a pattern or product information. The printing layer can be formed by a method such as gravure printing or offset printing using a known ink. The thermoplastic resin layer 201 can be subjected to an easy adhesion treatment such as a corona treatment to improve the adhesion with the printing layer. An overcoat layer may be provided outside the printed layer in order to improve wear resistance or surface decoration.

For the paper base layer 202, paperboard such as milk carton base paper can be used. The basis weight and density can be appropriately selected depending on the capacity and design of the container. For example, those having a basis weight of 200 g / m ^{2 to} 500 g / m ² and a density of 0.6 g / cm ^{3 to} 1.1 g / cm ³ can be used.

  The adhesive resin layer 203 is a layer made of a polyolefin resin having a function of adhering the paper base material layer 202 and the barrier layer 204. Specifically, high density polyethylene resin (HDPE), medium density polyethylene resin (MDPE), LDPE, LLDPE, ethylene / methacrylic acid copolymer (EMAA), ethylene / acrylic acid copolymer (EAA), ionomer, polypropylene (PP) or the like can be used. In order to increase the adhesive strength, the surface of the paper base material layer 202 or the barrier layer 204 may be subjected to corona treatment, ozone treatment, anchor coating, or the like. Alternatively, instead of the adhesive resin layer 203, an adhesive layer using a dry laminate adhesive or the like may be used. The thickness is preferably 10 μm or more and 60 μm or less. Sufficient adhesive strength can be obtained by setting it as 10 micrometers or more.

  The barrier layer 204 is a vapor deposition film composed of a base film 204a and a vapor deposition layer 204b provided on the inner film of the base film 204a. A resin film such as polyethylene terephthalate (PET), nylon, or PP can be used for the base film 204a. In particular, a biaxially stretched film of PET is suitable because it has little expansion and contraction during vapor deposition and bonding. The vapor deposition layer 204b is formed by vapor-depositing a metal such as aluminum, silica, alumina or the like on the base film 204a.

  When polyethylene terephthalate (PET) is used as the base film 204a, the thickness is preferably 6 μm or more and 25 μm or less. The thickness of the vapor deposition layer 204b is preferably 5 nm or more and 100 nm or less. As will be described later, when the dot processing line 207b is formed by laser light, the thickness of the base film 204a is preferably about 12 μm in consideration of ease of formation.

  As the base film layer 204a, a barrier-coated polyethylene terephthalate film obtained by applying a barrier coating to a polyethylene terephthalate film or a barrier film made of a barrier material such as EVOH may be used.

  Moreover, the barrier layer 204 is good also as a laminated | multilayer film comprised with the base film 204a and the metal foil 204c provided in the surface used as the outer side of the packaging container 1 of the base film 204a. FIG. 4 is a cross-sectional view schematically showing the laminated structure of the laminated body 21 according to the modified example of the laminated body 20 using a laminated film as the barrier layer 204.

  When the barrier layer 204 is a base film, a resin film such as PET, nylon, or PP can be used for the base film 204a. Further, an aluminum foil or the like can be used for the metal foil 204c. When the barrier film 204 is formed using a PET film for the base film 204a and an aluminum foil for the metal foil 204c, the thickness of the aluminum foil is 5 μm to 15 μm, and the thickness of the PET film is 6 μm to 25 μm. Is preferred. Considering the ease of forming the dot processing line 207b by laser light, the thickness of the PET film is preferably about 12 μm.

For the adhesive layer 205, a dry laminating adhesive or a non-solvent laminating adhesive may be used, or an extruding process may be used to adhere with a polyolefin resin. The coating amount is preferably 0.5 g / m ² or more and 7.0 g / m ² or less.

HDPE, MDPE, LDPE, LLDPE, etc. can be used for the sealant layer 206. There may also be a layer partially containing polybutene. Among the above materials, LLDPE is particularly preferable. In particular, those having a density of 0.925 g / cm ³ or less and MI (melt index) of 4 or more are preferable. The sealant layer 26 is preferably an unstretched film formed by a T-die method or an inflation method.

<Vulnerable part>
The laminate 20 is a perforation 207 a formed in the paper base material layer 202, in which the first notches 208 a that are not open are formed intermittently, and dot-like holes formed in the barrier layer 204. The weakened part 105 comprised by the dot process line 207b which arranged the 2nd notch part 208b in linear form is provided. As shown in FIG. 3, the perforation 207a is formed so as to overlap the dot processing line 207b in plan view.

  The perforation 207a is formed by intermittently providing the first notch 208a that is not open in the paper base material layer 202. The fact that the first cut portion 208a is not open means that the first cut portion 208a of the paper base material layer 202 is not penetrated, or penetrated during processing, but the cut surfaces contact each other, and the paper base layer When the material layer 202 is viewed from one of the surfaces, the layer laminated on the other surface cannot be visually recognized through the first cut portion 208a.

  FIG. 5 shows a laminate including a paper base layer 902 having a first cut portion 908a that is opened as a reference example, and an adhesive resin layer 903. Moreover, the laminated body which concerns on the modification of the laminated body 20 containing the paper base material layer 202 and the adhesive resin layer 203 which have the 1st cut part 208a which is not opened in FIG. 6 is shown. In FIGS. 5 and 6, layers other than the paper base material layers 902 and 202 and the adhesive resin layers 903 and 203 are omitted for convenience.

  Like the laminate shown in FIG. 5, the first cut portion 908a penetrates the paper base layer 902, and there is no portion where the cut surfaces of the paper base layer 902 that sandwich the first cut portion 908a contact each other. In this case, when the paper base material layer 902 is viewed from the upper surface of the paper in FIG. 5, the adhesive resin layer 903 can be visually recognized through the first cut portion 908a. Therefore, in the case shown in FIG. 5, it can be said that the first notch 908a is open.

  Further, for example, as in the laminated body illustrated in FIG. 6, even if the first cut portion 208 a passes through the paper base layer 202, the cut surfaces of the paper base layer 202 sandwiching the first cut portion 208 a are between each other. If there is a portion that contacts, the adhesive resin layer 203 cannot be visually recognized through the first cut portion 208a when the paper base layer 202 is viewed from above the paper surface of FIG. Therefore, in the case shown in FIG. 6, it can be said that the first cut portion 208a is not open.

  If the first cut portion 208 a is not open, the paper base material layer 202 can be formed with a depth and shape that can ensure the strength of the packaging container 1. As a method for forming the perforation 207a, half punching using a blade die, full punching, or the like can be used. The width of the first cut portion 208a formed by the blade mold can be adjusted by the shape of the blade and the cut depth.

  The dot processing line 207b is formed by intermittently providing the second cut portion 208b, which is a dotted hole, in the barrier layer 204 in a linear shape. In the barrier layer 204, the second cut portion 208b may be opened like the stacked body 20 or may not be opened like the stacked body 21.

  The dot processing line 207b can be formed by laser processing as long as the barrier layer 204 is bonded, but if it is formed before the barrier layer 204 is bonded, half-cutting with a blade mold, It can be formed by punching. The dot processing line 207b may be formed by laser processing before the barrier layer 204 is bonded.

  The first cut portion 208a may be formed at least in the paper base layer 202, and may be formed in the thermoplastic resin layer 201 and the paper base layer 202, for example. 7 and 8 show a laminated body 22 and a laminated body 23 according to a modified example of the laminated body 20 in which the first cut portions 208a are formed in the thermoplastic resin layer 201 and the paper base layer 202. FIG. The laminate 22 uses a vapor deposition film for the barrier layer 204. The laminated plate 23 uses a laminated film for the barrier layer 204. Since other configurations are the same as those of the stacked body 20, the description thereof is omitted.

(Operation of the first and second cut portions)
The first cut portion 208a constituting the perforation 207a is not open. For this reason, the laminate 20 has the adhesive resin layer 203 protected by the paper base layer 202, and even when heated with hot air or the like, pinholes are unlikely to occur in the adhesive resin layer 203, and the first cut portion 208a and the first Communication with the second cut portion 208b is suppressed.

  The perforation 207a is formed on the dot processing line 207b in plan view. For this reason, the user of the packaging container 1 easily cuts off the trunk portion 102 of the packaging container 1 by using the weakened part 105 formed by the perforation 207a and the dot processing line 207b, and the packaging container 1 using the laminate 20 is used. Can be dismantled.

  The laminates according to Examples 1-1 to 1-4, 2-1 to 2-4 and Comparative Examples 1-1 to 1-4, 2-1 to 2-4, and 3-1 to 3-4 were manufactured. These were used to evaluate the occurrence of pinholes and the possibility of dismantling.

  As shown in Table 1, the laminate used for the evaluation had the presence or absence of a fragile portion, the width of the bottom of the first cut portion, the presence or absence of an opening in the cut portion, the presence or absence of a cut portion in the thermoplastic resin layer, and a barrier layer. It produced by the combination of what is a vapor deposition film or a laminated | multilayer film. The width of the bottom portion of the first cut portion is the width of the paper base material layer expanded by the blade shape when forming the bottom portion of the first cut portion, and is 0 mm when there is no opening (comparative example). . In addition, Example 1-1 and 2-1 are laminated body 20, Example 1-2 and 2-2 are laminated body 21, Examples 1-3 and 2-3 are laminated body 22, Example 1 -4 and 2-4 correspond to the stacked body 23.

The laminated structure of the laminate is, in order from the outside to the inside of the packaging container, LDPE (18 μm) / paper substrate layer (400 g / m ² ) / EMAA (30 μm) / barrier layer (12 μm) / LLDPE (60 μm). ) Was produced. As the barrier layer, a film using a vapor deposition film (aluminum was vapor-deposited on a PET film) and a film using a laminated film (a dry laminate of an aluminum foil on a PET film) were prepared. A blade type was used to form the first cut portion in the paper base layer. The width of the bottom of the first cut portion was adjusted by the cutting depth of the blade type. The second cut portion was formed by laser processing after a barrier layer was bonded to the paper base material layer using EMAA.

  The produced laminate was cut into a blank shape shown in FIG. 2 to produce a blank of a gable top type packaging container having a capacity of 2000 ml. Then, 100 packaging containers were assembled using the created blank. When assembling the packaging container, use a dryer to apply 200 ° C hot air to the seal part including the weak part for 1 second to check for the occurrence of pinholes that connect the notches formed in the paper base layer and barrier layer. confirmed. Finally, we evaluated the possibility of disassembly using the fragile part of the assembled packaging container.

  Table 1 shows the evaluation results. In Table 1, “generation of pinholes” indicates the number of pinholes generated in the 100 evaluated laminates. As for “possibility of disassembly”, those that could be disassembled were indicated by “+”, and those that could not be disassembled were indicated by “−”. In addition, as “comprehensive evaluation”, a pinhole was not generated and disassembly was indicated by “+”, and other cases were indicated by “−”.

  From the above evaluation results, the dots formed in the paper base material layer, in which notched openings are intermittently formed, and dots formed in the barrier layer, in which dot-like holes are linearly arranged The perforation has a pinhole between the notches formed in the paper base material layer and the barrier layer due to the laminate formed on the dot processing line in plan view. It has been confirmed that a packaging container that can be easily disassembled can be manufactured using this.

  The present invention is not limited to the above-described embodiment, and can be implemented in various ways. For example, the layer configuration is not limited to the above example, and the present invention can be applied to any laminate that includes a paper base layer, a resin layer, and a barrier layer in this order. Moreover, if a packaging container is formed by bending a laminated body in a box shape, a shape will not be limited and it is not necessary to provide a spout stopper.

  The present invention is useful for a paper packaging container or the like that contains a liquid or the like.

DESCRIPTION OF SYMBOLS 1 Packaging container 10 Blank 100 Container main body 101 Top part 102 Body part 103 Bottom part 104 Outlet plug 104a Spout 104b Cap 105 Fragile part 106 Roof board 107 Folding board 108 Folding board 109 Side board 110 Bottom board 111 Seal part 112 Outlet hole 113 Cutting Start part 20-23 Laminate 201 Thermoplastic resin layer 202, 902 Paper base layer 203, 903 Adhesive resin layer 204 Barrier layer 204a Base film 204b Deposition layer 204c Metal foil 205 Adhesive layer 206 Sealant layer 207a Perforation 207b Dot processing Lines 208a, 908a First cut portion 208b Second cut portion

Claims (2)

A laminate comprising a paper base layer, a resin layer, and a barrier layer in this order, and having a linear fragile portion,
The vulnerable part is
A perforation formed in the paper base material layer, in which notched openings are formed intermittently;
Formed by dot processing lines in which the dotted holes are linearly formed in the barrier layer;
The said perforation is a laminated body currently formed on the said dot process line in planar view.   The packaging container formed by sealing the edge part of the laminated body of Claim 1 bent in the box shape.

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