JP2019038574A - Laminate for paper container and paper container provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated body for paper containers capable of remarkably reducing carbon dioxide emission during incineration. A laminate for a paper container of the present invention comprises at least a first extruded resin layer, a paper substrate, and a second extruded resin layer in this order, and the first extruded resin layer and / or the first extruded resin layer. The second extruded resin layer includes a carbon dioxide absorbent. [Selection] Figure 1

Description

  The present invention relates to a laminate used for the manufacture of paper containers, and more particularly to a laminate for paper containers that can further reduce carbon dioxide emission during incineration and a paper container provided with the same.

  Paper containers are widely used as containers for filling foods and non-foods. Polyester resins, polyolefin resins, polyamide resins, etc. are included for the purpose of imparting gas barrier properties and durability to the paper containers. Laminates having a resin layer on a paper substrate are used in the manufacture of paper containers.

  These paper containers are only partially recycled, and most of them are incinerated after disposal. In recent years, carbon dioxide generated during incineration has caused environmental problems such as global warming. It has been viewed as a problem.

  This invention is made | formed in view of the said problem, The subject which it is going to solve is providing the laminated body for paper containers which can reduce significantly the carbon dioxide emission amount at the time of incineration.

  The laminate for paper containers of the present invention comprises at least a first extruded resin layer, a paper substrate, and a second extruded resin layer in this order, and the first extruded resin layer and / or the second extruded resin. The layer is characterized by containing a carbon dioxide absorbent.

In one embodiment, the laminate for a paper container of the present invention comprises a third extruded resin layer, a polyester-based resin layer, a first extruded resin layer, a paper base material, and a second extruded resin layer. In this order,
The first extruded resin layer, the second extruded resin layer, and / or the third extruded resin layer includes a carbon dioxide absorbent.

  In one Embodiment, the polyester-type resin layer with which the laminated body for paper containers of this invention is provided with a vapor deposition film.

  In one embodiment, the laminate for paper containers of the present invention further includes a sealant layer on the surface of the third extruded resin layer opposite to the side on which the polyester-based resin layer is provided.

  In one embodiment, the laminate for paper containers of the present invention further includes a barrier layer between the polyester resin layer and the first extruded resin layer.

  In one embodiment, the 1st extrusion resin layer with which the layered product for paper containers of the present invention is provided, the 2nd extrusion resin layer, and / or the 3rd extrusion resin layer further contain a dispersing agent.

  In one embodiment, the total content of the carbon dioxide absorbent and the dispersant in the first extruded resin layer, the second extruded resin layer, and / or the third extruded resin layer is 0.1% by mass or more, respectively. 5% by mass or less.

  The paper container of this invention is equipped with the said laminated body for paper containers.

  ADVANTAGE OF THE INVENTION According to this invention, the laminated body for paper containers which can reduce significantly the carbon dioxide discharge amount at the time of incineration can be provided. In addition, when a printing layer is provided on the paper substrate, the extruded resin layer provided in the paper container laminate of the present invention can serve as a protective layer, thereby preventing deterioration of printing over time. Can do.

It is a schematic cross section which shows an example of the laminated body of this invention. It is a schematic cross section which shows an example of the laminated body of this invention. It is a schematic cross section which shows an example of the laminated body of this invention. It is a perspective view which shows an example of the paper container of this invention. It is a front view which shows the blank board used for manufacture of the paper container shown by FIG. It is a perspective view which shows an example of the paper container of this invention. It is a front view which shows the blank board used for manufacture of the paper container shown by FIG. It is a perspective view which shows an example of the paper container of this invention. It is a front view which shows the blank board used for manufacture of the paper container shown by FIG.

<Laminated body for paper containers>
The laminated body for paper containers of this invention is demonstrated referring drawings. The example of a schematic cross section of the laminated body for paper containers of this invention is shown in FIGS.
As shown in FIG. 1, the laminated body 10 for paper containers of this invention is equipped with the 1st extrusion resin layer 11, the paper base material 12, and the 2nd extrusion resin layer 13 in this order at least.
Moreover, in one Embodiment, as shown in FIG. 2, the laminated body 10 for paper containers of this invention is the 3rd extrusion resin layer 14, the polyester-type resin layer 15, the 1st extrusion resin layer 11, A paper base 12 and a second extruded resin layer 13 are provided in this order.
Moreover, in one Embodiment, as shown in FIG. 3, the laminated body 10 for paper containers of this invention is on the surface on the opposite side to the side in which the polyester-type resin layer 15 of the 3rd extrusion resin layer 14 was provided. The sealant layer 16 is further provided.
Moreover, in one Embodiment, the laminated body 10 for paper containers of this invention is further equipped with the anchor-coat layer 17 between arbitrary layers, as shown in FIG.
Moreover, although not shown in figure, the laminated body 10 for paper containers of this invention may be equipped with other layers, such as a barrier layer and a light shielding layer, between arbitrary layers.

  Hereinafter, each layer which comprises the laminated body for paper containers of this invention is demonstrated.

[Extruded resin layer]
The extruded resin layer is a layer formed by a melt extrusion laminating method using a thermoplastic resin and a carbon dioxide absorbent described later.
The laminate of the present invention comprises at least two or more extruded resin layers (first extruded resin layer and second extruded resin layer).
The extruded resin layers provided in the laminate of the present invention may have the same configuration and thickness, or may have different configurations.
For example, all of the first extruded resin layer, the second extruded resin layer, and the third extruded resin layer may contain a carbon dioxide absorbent, and only one layer contains the carbon dioxide absorbent. Also good. In addition, it goes without saying that the carbon dioxide reducing effect at the time of incineration is improved by adding a carbon dioxide absorbent to all the extruded resin layers.
The extruded resin layer may contain two or more different carbon dioxide absorbents.

Examples of the thermoplastic resin constituting the extruded resin layer include a polyethylene resin, a polypropylene resin, or a cyclic polyolefin resin, or a copolymer resin, a modified resin, or a mixture (including alloy) containing these resins as a main component. ) Can be used.
Examples of polyolefin resins include low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), linear (linear) low density polyethylene (LLDPE), polypropylene (PP), and metallocene catalysts. Ethylene-α / olefin copolymer, ethylene / polypropylene random or block copolymer, ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), ethylene Ethyl acrylate copolymer (EEA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methyl methacrylate copolymer (EMMA), ethylene / maleic acid copolymer, ionomer resin, and interlayer adhesion In order to improve the , It can be used acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, an acid-modified polyolefin resin modified with an unsaturated carboxylic acid such as itaconic acid.
Moreover, the resin etc. which graft-polymerized or copolymerized unsaturated carboxylic acid, unsaturated carboxylic anhydride, and ester monomer can be used for polyolefin resin.
These materials can be used alone or in combination of two or more.
As the cyclic polyolefin resin, for example, cyclic polyolefin such as ethylene-propylene copolymer, polymethylpentene, polybutene, polynorbornene, and the like can be used. These resins can be used alone or in combination.

The carbon dioxide absorbent used by mixing with the above-described thermoplastic resin can be used without particular limitation as long as it absorbs carbon dioxide chemically or physically.
Examples of the carbon dioxide absorbent include metal hydroxides such as lithium hydroxide, sodium hydroxide, magnesium hydroxide, calcium hydroxide, and barium hydroxide, metal oxides such as zinc oxide, titanium oxide, and aluminum oxide, and non-oxides. Mention may be made of crystalline aluminosilicates, natural zeolites, aluminosilicates such as synthetic zeolites, titanic acid compounds such as barium titanate, lithium silicates, silica gel, alumina and activated carbon. Among these, aluminosilicate is particularly preferable from the viewpoint of transparency of the laminate.

The shape of the carbon dioxide absorbent is not particularly limited, but is preferably a particle shape from the viewpoint of dispersibility.
The particle size is preferably 0.01 μm or more and 10 μm or less, and more preferably 0.01 μm or more and 1 μm or less. By setting the particle size within the above numerical range, the dispersibility in the extruded resin layer can be improved while maintaining the carbon dioxide absorption performance.
In the present invention, the particle size means “average particle diameter” and can be measured by a dynamic light scattering method.

  As a method of mixing the above-described thermoplastic resin with a carbon dioxide absorbent and forming an extruded resin layer by a melt extrusion laminating method, the thermoplastic resin pellets and the carbon dioxide absorbent are supplied to the inlet of the melt extruder. Alternatively, a master batch containing a carbon dioxide absorbent may be supplied together with the thermoplastic resin pellets to the inlet of the melt extruder. In any case, it is preferable to use a dispersant in combination so that the carbon dioxide absorbent is uniformly dispersed in the thermoplastic resin during melt kneading in the melt extruder. By using the dispersant in combination, it is possible to prevent the carbon dioxide absorbent from aggregating, reducing the surface area, and reducing the carbon dioxide absorption performance.

The dispersant preferably has a hydroxyl group in the molecule.
Specifically, polyglycerin fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene glycerin fatty acid ester, polyoxyethylene sorbitol fatty acid ester, polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene castor oil, Examples thereof include polyoxypropylene-polyoxyethylene condensate. Among these, a polyoxypropylene-polyoxyethylene condensate is preferable because the dispersibility of the carbon dioxide absorbent is particularly excellent.

  The weight average molecular weight of the dispersant is preferably 1000 or more and 5000 or less, more preferably 3000 or more and 4000 or less, from the viewpoint of fluidity and prevention of bleeding out.

  When the carbon dioxide absorbent and the thermoplastic resin are melt-kneaded, it is preferable to mix the carbon dioxide absorbent with the thermoplastic resin in a state in which the carbon dioxide absorbent is taken into the lipid bilayer of the amphiphilic lipid. Examples of amphiphilic lipids include phospholipids, and more specific examples include phosphatidylcholine, dimyristoylphosphatidylcholine, phosphatidylethanolamine, phosphatidylinositol, phosphatidylglycerol, diphosphatidylglycerol, and sphingomyelin. The amphiphilic lipid forms a lipid bilayer in the thermoplastic resin during melt-kneading due to self-organization. By incorporating the carbon dioxide absorbent into this, the carbon dioxide absorbent is uniformly distributed in the resin. Can be dispersed.

The total content of carbon dioxide absorbent and dispersant contained in each extruded resin layer is preferably 0.1% by mass or more and 5% by mass or less, more preferably 0.1% by mass or more, It is below mass%. By setting the contents of the carbon dioxide absorbent and the dispersant within the above numerical range, the carbon dioxide emission during incineration can be further reduced.
Moreover, generation | occurrence | production of the delamination with the layer adjacent to an extrusion resin layer can be suppressed.
Furthermore, since the transparency of the extruded resin layer can also be maintained, when the printed layer is present as a layer adjacent to the extruded resin layer, a decrease in visibility can be suppressed.

  As long as the properties of the present invention are not impaired, the extruded resin layer contains additives such as an antioxidant, an ultraviolet absorber, a light stabilizer, an antistatic agent, an antiblocking agent, a flame retardant, a crosslinking agent, and a colorant. Can be included.

  The thickness of the extruded resin layer is not particularly limited, but is preferably 5 μm or more and 60 μm or less. By setting the thickness of the extruded resin layer in the above numerical range, it is possible to further reduce the carbon dioxide emission during incineration, and to obtain a laminate for a packaging bag that can solve the problems of transparency and delamination.

[Paper base]
The laminate for paper containers of the present invention comprises at least a paper substrate. The paper substrate is a layer for supporting the laminate.
As the paper base material, any paper having formability, flex resistance, rigidity, waist, strength and the like can be used according to the use of the laminate of the present invention. For example, it is a main strength material, and various types of paper such as strong size bleached or unbleached paper, or pure white roll paper, kraft paper, paperboard, processed paper, and milk base paper can be used.
The paper base material layer may be obtained by laminating a plurality of layers of these papers.

The basis weight of the paper substrate is preferably 100 g / m ² or more and 500 g / m ² or less, and more preferably 120 g / m ² or more and 400 g / m ² or less. By setting the basis weight of the paper base to the above numerical range, the strength of the container manufactured using the laminate can be improved while maintaining the processability of the laminate of the present invention.

  Moreover, in order to improve the adhesiveness between adjacent layers, the surface of the paper base material can be subjected to surface treatment such as corona discharge treatment, chemical treatment, ozone treatment, etc. as desired.

The paper base material may be provided with a printing layer (not shown) using a conventionally known printing ink. The printing layer is used for decoration, content display, best-of-life display, manufacturer, seller, etc., and other display and aesthetics, including letters, numbers, pictures, figures, symbols, patterns, etc. It is a layer for forming a desired arbitrary printed pattern. The print layer may be provided on the entire surface of the paper substrate, or may be provided on a part thereof. The printing layer can be formed using a conventionally known pigment or dye, and the printing method is not particularly limited, and a conventionally known method such as gravure printing, flexographic printing, or screen printing can be used. .
When the printing layer is provided on the paper substrate, the extruded resin layer functions as a protective layer, and can prevent deterioration of printing with time.

[Polyester resin layer]
In one embodiment, the laminate of the present invention includes a polyester resin layer.
When the laminate of the present invention is provided with a polyester resin layer, the mechanical strength of the laminate can be improved.
Examples of the polyester resin contained in the polyester resin layer include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), polybutylene naphthalate (PBN), polytetramethylene terephthalate, and polycyclohexane. Examples include dimethylene terephthalate (PCT).

  The polyester resin layer may be provided with a vapor deposition film for the purpose of improving barrier properties. The deposited film is formed by a physical vapor deposition method (PVD method) such as a vacuum deposition method, a sputtering method or an ion plating method, or a chemical method such as a plasma chemical vapor deposition method, a thermal chemical vapor deposition method or a photochemical vapor deposition method. It can be formed by a conventionally known method such as a vapor deposition method (CVD method).

  As long as the properties of the present invention are not impaired, the polyester resin layer is made of additives such as antioxidants, ultraviolet absorbers, light stabilizers, antistatic agents, antiblocking agents, flame retardants, crosslinking agents, and coloring agents. Can be included.

  Examples of the material for forming the deposited film include silicon (Si), aluminum (Al), magnesium (Mg), calcium (Ca), potassium (K), tin (Sn), sodium (Na), and boron (B). , Titanium (Ti), lead (Pb), zirconium (Zr), yttrium (Y), and other inorganic substances or inorganic oxides.

Representation of the inorganic oxide, for _example, SiO X, as such AlO _X MO _X (In the formula, M represents an inorganic element, the value of X, varies each of an inorganic element range.) In expressed. As a range of the value of X, silicon (Si) is 0 to 2, aluminum (Al) is 0 to 1.5, magnesium (Mg) is 0 to 1, calcium (Ca) is 0 to 1, 0 to 0.5 for potassium (K), 0 to 2 for tin (Sn), 0 to 0.5 for sodium (Na), 0 to 1,5 for boron (B), titanium (Ti) Can take values in the range of 0 to 2, lead (Pb) in the range of 0 to 1, zirconium (Zr) in the range of 0 to 2, and yttrium (Y) in the range of 0 to 1.5. In the above, when X = 0, it is a complete inorganic simple substance (pure substance) and is not transparent, and the upper limit of the range of X is a completely oxidized value. Silicon (Si) and aluminum (Al) are suitably used for the packaging material, silicon (Si) is in the range of 1.0 to 2.0, and aluminum (Al) is in the range of 0.5 to 1.5. Can be used.

  In the present invention, the film thickness of the inorganic material or inorganic oxide vapor-deposited film as described above varies depending on the kind of inorganic material or inorganic oxide used, but is, for example, about 50 to 2000 mm, preferably about 100 to 1000 mm. It is desirable to select and form arbitrarily within the range.

  More specifically, in the case of an aluminum vapor-deposited film, the film thickness is preferably about 50 to 600 mm and in the range of 100 to 450 mm, and in the case of an aluminum oxide or silicon oxide vapor-deposited film, the film thickness is 50 to 500 mm. About 100 to 300 mm is desirable.

  Although the thickness of a polyester-type resin layer is not specifically limited, It is preferable that they are 5 micrometers or more and 500 micrometers or less, and it is more preferable that they are 10 micrometers or more and 200 micrometers or less.

[Sealant layer]
In one embodiment, the laminate of the present invention comprises a sealant layer.
When manufacturing a packaging bag using a laminated body, a sealant layer is arrange | positioned at the contents side of a packaging bag, and has a function which seals laminated bodies. Even in a laminate having the melt-extruded layer as an inner layer, the laminates can be sealed by heat sealing, but by providing a sealant layer, workability and sealing performance at the time of sealing can be improved. The resin contained in the sealant layer is not particularly limited as long as it can be fused to each other by heat. For example, low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), linear (Linear) Low-density polyethylene (LLDPE), ethylene-α / olefin copolymer polymerized using metallocene catalyst, ethylene / polypropylene random or block copolymer, polypropylene, ethylene-vinyl acetate copolymer (EVA) ), Ethylene-acrylic acid copolymer (EAA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methyl methacrylate copolymer (EMMA), ionomer resin Heat-sealable ethylene / vinyl alcohol resin, , Copolymerized resin methylpentene resin, ethylene-propylene copolymer, methylpentene polymer, polybutene polymer, polyolefin resin such as polyethylene, polypropylene or cyclic olefin copolymer, polyolefin resin such as acrylic acid, methacrylic acid, maleic acid, Examples thereof include acid-modified polyolefin resins modified with unsaturated carboxylic acids such as maleic anhydride, fumaric acid, and itaconic acid, polyvinyl acetate resins, poly (meth) acrylic resins, and polyvinyl chloride resins.

  Among the above-described resins, it is preferable to use polyethylene resins such as low density polyethylene and linear low density polyethylene, and polyolefin resins such as polypropylene, from the viewpoints of adhesion and manufacturing cost. The sealant layer is preferably made of an unstretched film.

  Linear low density polyethylene is obtained by polymerizing ethylene and a small amount of α-olefin by low pressure polymerization (gas phase polymerization using Ziegler-Natta catalyst or liquid phase polymerization using metallocene catalyst). . Linear low density polyethylene has many short molecular chains in the molecular chain and is excellent in sealing performance.

  The sealant layer may be a single layer or a multilayer. When the above-described linear low-density polyethylene derived from biomass is used for the sealant layer, a sealant layer including three layers of an inner layer, an intermediate layer, and an outer layer may be used. In this case, the intermediate layer is preferably made of biomass-derived linear low density polyethylene, and the inner layer and the outer layer are preferably made of conventionally known fossil fuel-derived linear low density polyethylene.

  The thickness of the sealant layer is preferably 25 μm or more and 150 μm or less, and more preferably 40 μm or more and 70 μm or less. By setting the thickness of the sealant layer within the above numerical range, the generation of carbon dioxide during incineration can be suppressed, and the amount of carbon dioxide absorbent used can be reduced.

  The sealant layer may contain a carbon dioxide absorbent and a dispersant.

[Anchor coat layer]
In one embodiment, the laminate of the present invention includes an anchor coat layer between arbitrary layers for the purpose of improving the adhesion between adjacent layers.
Examples of the anchor coating agent include an anchor coating agent made of any resin having a heat resistant temperature of 135 ° C. or higher, such as a vinyl-modified resin, an epoxy resin, a urethane resin, a polyester resin, or a polyethyleneimine. An anchor coating agent that is a cured product of a polyacrylic or polymethacrylic resin (polyol) having two or more hydroxyl groups and an isocyanate compound as a curing agent can be preferably used. Moreover, a silane coupling agent may be used in combination as an additive, and nitrified cotton may be used in combination in order to improve heat resistance.
The anchor coat layer can be formed by applying and drying an anchor coat agent on an arbitrary layer.

[Other layers]
[Barrier layer]
In one embodiment, the laminate of the present invention includes a barrier layer between arbitrary layers. For example, the laminate of the present invention includes a barrier layer between a polyester resin layer and a first extruded resin layer.
The barrier layer is provided to extend the storage period of the contents, and is made of a metal foil such as aluminum, an ethylene-vinyl alcohol copolymer (EVOH), a polyvinylidene chloride resin (PVDC), or an aromatic fragrance such as nylon MXD6. A resin layer having gas barrier properties, such as a group polyamide, can be used.
Moreover, you may provide the vapor deposition film | membrane of an inorganic substance or an inorganic oxide as above-mentioned. Further, on the vapor deposition layer, a general formula R1nM (OR2) m (wherein R1 and R2 represent an organic group having 1 to 8 carbon atoms, M represents a metal atom, and n is 0 or more) M represents an integer of 1 or more, and n + m represents a valence of M.) and at least one alkoxide represented by the above-mentioned polyvinyl alcohol-based resin and / or A gas barrier coating film comprising an ethylene / vinyl alcohol copolymer and further obtained by a transparent gas barrier composition that is polycondensed by a sol-gel method in the presence of a sol-gel method catalyst, an acid, water, and an organic solvent May be provided.

  The thickness of the barrier layer is preferably 4 μm or more and 12 μm or less, and more preferably 5 μm or more and 9 μm or less. By setting the thickness of the barrier layer within the above numerical range, the generation of carbon dioxide during incineration can be suppressed, and the amount of carbon dioxide absorbent used can be reduced.

[Shading layer]
In one embodiment, the laminate of the present invention includes a light shielding layer between arbitrary layers.
The light shielding layer is a layer provided to prevent ultraviolet rays and / or visible light from reaching the contents. The light shielding layer can be formed using white ink mainly containing titanium oxide or the like, black ink mainly containing carbon black, or gray ink mainly containing aluminum paste. As described above, when a metal foil such as an aluminum foil is used as the barrier layer, the barrier layer may also serve as a light shielding layer.

  The thickness of the light shielding layer is preferably 4 μm or more and 12 μm or less, and more preferably 5 μm or more and 9 μm or less.

<Method for producing paper container laminate>
The manufacturing method of the laminated body of this invention is not specifically limited, It can manufacture using conventionally well-known methods, such as a dry lamination method and a sand lamination method.

  The laminate of the present invention is provided with chemical functions, electrical functions, magnetic functions, mechanical functions, friction / abrasion / lubricating functions, optical functions, thermal functions, surface functions such as biocompatibility, etc. For the purpose, it is also possible to perform secondary processing. Examples of secondary processing include embossing, painting, adhesion, printing, metalizing (plating, etc.), machining, surface treatment (antistatic treatment, corona discharge treatment, plasma treatment, photochromism treatment, physical vapor deposition, chemical vapor deposition, Coating, etc.). The laminate of the present invention can also be subjected to laminating (dry laminating or extrusion laminating), bag making, and other post-processing.

<Paper container>
In one embodiment, the paper container of the present invention has a shape as shown in FIG.
As shown in FIG. 4, the paper container 20 of the present invention includes a trunk portion 21, a roof-like top portion 22 formed on the opening end portion above the trunk portion 20, and an opening end below the trunk portion 21. And a bottom portion 23 formed in the portion.
The paper container 20 can be formed by the following method.
First, the laminate shown in FIG. 2 or 3 is punched to form a blank plate 24 as shown in FIG.
Next, when the laminate shown in FIG. 2 is used, the paper container 20 can be manufactured by bending the third extruded resin layer so that the third extruded resin layer is on the inner side and adhering using an adhesive or the like.
In addition, when the laminate shown in FIG. 3 is used, the paper container 20 can be manufactured by bending and thermocompression bonding so that the sealant layer is inside.
When the contents are milk, liquor or the like, it is not necessary to use an adhesive, and therefore it is preferable to manufacture a paper container with the laminate shown in FIG.

Also, as shown in FIG. 6, the paper container 30 may have a shape that can be filled with tobacco or the like.
In this case, the paper container 30 may include perforations 31 and 32, an opening piece 33 surrounded by the perforation, and a knob 34 at the tip of the opening piece 33 so that the paper container 30 can be easily opened.
The paper container 30 is manufactured by punching the laminated body shown in FIG. 2 or 3 to form a blank plate 35 as shown in FIG. 7 and box-making it by the same method as described above. be able to.

Further, as shown in FIG. 8, the paper container 40 may have a shape capable of displaying a pouch product or the like.
The paper container 40 is manufactured by punching the laminate shown in FIG. 2 or 3 to form a blank plate 41 as shown in FIG. 9 and box-making it in the same manner as described above. be able to.

  The shape of the paper container of the present invention is not limited to that described above, and may be, for example, a so-called auto bottom type paper container.

  EXAMPLES Next, although an Example demonstrates this invention further more concretely, this invention is not limited to description of a following example, unless the summary is exceeded.

[Example 1-1]
As the polyester resin layer, an aluminum oxide vapor-deposited biaxially stretched PET film having a thickness of 12 μm was prepared.

  A urethane-based anchor coating agent was applied to the vapor deposition surface of the PET film so that the film thickness after drying was 0.5 μm and dried to form an anchor coat layer.

Next, a mixture of a carbon dioxide absorbent (aluminosilicate, average particle size: 0.1 μm) and a dispersant (polyoxypropylene-polyoxyethylene condensate) is added to low-density polyethylene at 0.6 to the whole. It is added at a ratio of mass%, and extrusion lamination is performed at a temperature of 330 ° C. using an extruder at a thickness of 25 μm. The above-mentioned PET film anchor coat layer surface and a paper having a basis weight of 365 g / m ² The base material was bonded through the first extruded resin layer.

  On the other side of the paper substrate, a mixture of carbon dioxide absorbent (aluminosilicate, average particle size: 0.1 μm) and dispersant (polyoxypropylene-polyoxyethylene condensate) is added to the density polyethylene and the whole. The mixture was added at a ratio of 0.6% by mass, and extrusion coating was performed at a temperature of 330 ° C. using an extruder at a thickness of 25 μm to form a second extruded resin layer.

  A urethane-based anchor coating agent was applied to the non-deposited surface of the PET film so that the film thickness after drying was 0.5 μm and dried to form an anchor coat layer.

  Next, a mixture of a carbon dioxide absorbent (aluminosilicate, average particle size: 0.1 μm) and a dispersant (polyoxypropylene-polyoxyethylene condensate) is added to low-density polyethylene at 0.6 to the whole. It is added at a ratio of mass%, and extrusion lamination is performed at a temperature of 330 ° C. using an extruder at a thickness of 30 μm. The above-mentioned PET film anchor coat layer surface and a sealant layer of 40 μm thick LLDPE The film was bonded through a third extruded resin layer.

Next, the surface of the second extruded resin layer was subjected to corona treatment to form a printed layer, and a paper container laminate 1 was produced.
In addition, the structure of the laminated body 1 for paper containers was as follows.
Sealant layer / third extruded resin layer / anchor coat layer / polyester resin layer / anchor coat layer / first extruded resin layer / paper substrate / second extruded resin layer / printing layer

[Example 1-2]
In Example 1-1, the blending amount of the mixture of the carbon dioxide absorbent and the dispersant was changed from 0.6% by mass to 0.2% by mass, and the first extruded resin layer and the second extruded resin were changed. A laminated body 2 for paper containers was produced in the same manner as in Example 1-1 except that the resin layer and the third extruded resin layer were formed.

[Comparative Example 1-1]
Example 1-1 is the same as Example 1-1 except that the carbon dioxide absorbent and the dispersant were not used, and the first extruded resin layer, the second extruded resin layer, and the third extruded resin layer were formed. Similarly, a laminate 3 for paper containers was produced.

<Manufacture of paper containers>
Each of the laminates 1 to 3 obtained in Examples and Comparative Examples was boxed so that the sealant layer was on the inside, and a paper container shown in FIG. 4 having a capacity of 200 mL was manufactured.

<Measurement of carbon dioxide emissions>
The amount of carbon dioxide discharged when each paper container obtained above was incinerated was determined by measuring the residual amount by a TG / DTA test.
The amount of carbon dioxide discharged when the paper container produced using the paper container laminate 1 of Example 1-1 was incinerated was produced using the paper container laminate 3 of Comparative Example 1-1. This was 0.85 times the amount of carbon dioxide emitted when the paper container was incinerated.

  Moreover, the discharge amount of the carbon dioxide emitted when the paper container manufactured using the laminated body 2 for paper containers of Example 1-2 was incinerated uses the laminated body 3 for paper containers of Comparative Example 1-1. It was 0.94 times the amount of carbon dioxide emitted when the paper container manufactured in this way was incinerated.

<Evaluation of transparency>
When the transparency of the second extruded resin layer included in the paper container laminates 1 to 3 obtained as described above was evaluated based on the appearance of the printed layer, the paper containers of Examples 1-1 to 1-2 were used. No difference was observed between the laminates 1 and 2 for use and the laminate 3 for paper containers of Comparative Example 1-1.

<Evaluation of laminate strength>
About each of the laminated bodies 1 to 3 for paper containers obtained as described above, the following laminate strength was measured using a tensile tester at a test width of 15 mm and a tensile speed of 50 mm / min. The measurement results are shown in Table 1.

<Odor evaluation>
When the sensitivity evaluation was performed on the odor in the paper container manufactured using the laminate for the paper container of the example and the comparative example, the odor of the carbon dioxide absorbent or the dispersant was not present in any of the paper containers, and it was odorless. Met.

[Example 2-1]
A printing layer was formed on one side of a paper substrate having a basis weight of 130 g / m ² by gravure printing.

  A biaxially stretched PET film having a thickness of 12 μm was prepared as a polyester resin layer.

  A urethane-based anchor coating agent was applied to one surface of the PET film so that the film thickness after drying was 0.5 μm, and dried to form an anchor coat layer.

  Next, a mixture of a carbon dioxide absorbent (aluminosilicate, average particle size: 0.1 μm) and a dispersant (polyoxypropylene-polyoxyethylene condensate) is added to low-density polyethylene at 0.6 to the whole. It is added at a ratio of mass%, and extrusion lamination is performed at a temperature of 330 ° C. using an extruder at a thickness of 20 μm. The anchor coat layer surface of the PET film and the non-printing surface of the paper substrate Were bonded through a first extruded resin layer.

  Next, a mixture of a carbon dioxide absorbent (aluminosilicate, average particle size: 0.1 μm) and a dispersant (polyoxypropylene-polyoxyethylene condensate) is added to the low density polyethylene on the printed layer. Then, extrusion coating was performed at a temperature of 330 ° C. using an extruder at a thickness of 20 μm to form a second extruded resin layer.

  A urethane-based anchor coating agent was applied to the other surface of the PET film so that the film thickness after drying was 0.5 μm, and dried to form an anchor coat layer.

On the anchor coat layer, a mixture of a carbon dioxide absorbent (aluminosilicate, average particle size: 0.1 μm) and a dispersant (polyoxypropylene-polyoxyethylene condensate) is added to low density polyethylene with respect to the whole. 0.6 mass%, and at a temperature of 330 degrees using an extruder, extrusion coating is performed at a thickness of 20 μm to form a third extruded resin layer, which is laminated for paper containers Body 4 was produced.
In addition, the structure of the laminated body 4 for paper containers was as follows.
Third extruded resin layer / anchor coat layer / polyester resin layer / anchor coat layer / first extruded resin layer / paper substrate / printing layer / second extruded resin layer

[Example 2-2]
In Example 2-1, the blending amount of the mixture of the carbon dioxide absorbent and the dispersant was changed from 0.6% by mass to 0.2% by mass, and the first extruded resin layer and the second extruded resin The laminated body 5 for paper containers was manufactured like Example 2-1, except having formed the resin layer and the 3rd extrusion resin layer.

[Comparative Example 2-1]
Example 2-1 was the same as Example 2-1 except that the carbon dioxide absorbent and the dispersant were not used, and the first extruded resin layer, the second extruded resin layer, and the third extruded resin layer were formed. Similarly, a laminate 6 for paper containers was produced.

<Manufacture of paper containers>
Each laminated body 4-6 obtained by the Example and the comparative example was boxed so that the 3rd extrusion resin layer might become an inner side, and the paper container shown by FIG. 6 was manufactured.

<Measurement of carbon dioxide emissions>
The amount of carbon dioxide discharged when each paper container obtained above was incinerated was determined by measuring the residual amount by a TG / DTA test.
The amount of carbon dioxide discharged when the paper container produced using the paper container laminate 4 of Example 2-1 was incinerated was produced using the paper container laminate 6 of Comparative Example 2-1. This was 0.82 times the amount of carbon dioxide emitted when the paper container was incinerated.

  Moreover, the discharge amount of the carbon dioxide emitted when the paper container manufactured using the laminated body 5 for paper containers of Example 2-2 was incinerated uses the laminated body 6 for paper containers of Comparative Example 2-1. It was 0.87 times the amount of carbon dioxide discharged when the paper container manufactured in this way was incinerated.

<Evaluation of transparency>
When the transparency of the second extruded resin layer provided in the paper container laminates 4 to 6 obtained as described above was evaluated based on the appearance of the printed layer, the paper containers of Examples 2-1 to 2-2 were used. No difference was observed between the laminates 4 and 5 for use and the laminate 6 for paper containers of Comparative Example 2-1.

<Evaluation of laminate strength>
With respect to each of the laminates 4 to 6 for paper containers obtained as described above, the following laminate strength was measured using a tensile tester at a test width of 15 mm and a tensile speed of 50 mm / min. The measurement results are shown in Table 2.

<Odor evaluation>
When the sensitivity evaluation was performed on the odor in the paper container manufactured using the laminate for the paper container of the example and the comparative example, the odor of the carbon dioxide absorbent or the dispersant was not present in any of the paper containers, and it was odorless. Met.

10: Laminate for paper container 11: First extruded resin layer 12: Paper base material 13: Second extruded resin layer 14: Third extruded resin layer 15: Polyester resin layer 16: Sealant layer 17: Anchor coat Layer 20, 30, 40: Paper container 21: Body part 22: Top part 23: Bottom part 24, 35, 41: Blank board 30: Paper container 31, 32: Perforation 33: Opening piece 34: Pick part

Claims (8)

At least a laminated body for paper containers comprising a first extruded resin layer, a paper base material, and a second extruded resin layer in this order,
The laminate for a paper container, wherein the first extruded resin layer and / or the second extruded resin layer contains a carbon dioxide absorbent. A third extruded resin layer, a polyester resin layer, a first extruded resin layer, a paper substrate, and a second extruded resin layer are provided in this order.
The laminate for a paper container according to claim 1, wherein the first extruded resin layer, the second extruded resin layer and / or the third extruded resin layer contains a carbon dioxide absorbent.   The laminated body for paper containers of Claim 2 with which the said polyester-type resin layer is provided with a vapor deposition film.   The laminated body for paper containers of Claim 2 or 3 further equipped with a sealant layer in the surface on the opposite side to the side in which the said polyester-type resin layer of the said 3rd extrusion resin layer was provided.   The laminated body for paper containers as described in any one of Claims 2-4 further equipped with a barrier layer between the said polyester-type resin layer and said 1st extrusion resin layer.   The laminate for a paper container according to any one of claims 1 to 5, wherein the first extruded resin layer, the second extruded resin layer, and / or the third extruded resin layer further contains a dispersant. body.   The total content of the carbon dioxide absorbent and the dispersant in the first extruded resin layer, the second extruded resin layer and / or the third extruded resin layer is 0.1% by mass or more, respectively. The laminated body for paper containers of Claim 6 which is 5 mass% or less.   A paper container provided with the laminated body for paper containers as described in any one of Claims 1-7.

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