JP2019064016A - Laminate for heat insulation container, heat insulation container, and method for manufacturing heat insulation container - Google Patents

Abstract

To provide a laminate for heat insulation container having a printing layer provided thereon, which is excellent in smoothness on a surface of the printing layer even after foaming and can achieve a desired design.SOLUTION: A laminate 10 for heat insulation container is formed by laminating at least a printing layer 15, a surface layer 16, a cover layer 11, a base material layer 12 composed of paper, and a water vapor blocking layer 13 that blocks water vapor generated from the paper constituting the base material layer 12, from the outer surface side, where the cover layer 11 is composed of high pressure low density polyethylene, the surface layer 16 is composed of a low density polyethylene resin having a melting point measured according to JIS K 6922-2(2010) higher than the melting point of the high pressure low density polyethylene constituting the cover layer 11, the printing layer 15 contains an urethane resin as a binder resin, and a ratio of the urethane resin to the total binder resin is 18 mass% or more.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a laminate for a heat insulation container, a heat insulation container, and a method of manufacturing the heat insulation container.

  DESCRIPTION OF RELATED ART Conventionally, the laminated body for heat insulation containers in which the foaming layer was provided in one side of the base material comprised from paper, and the non-foaming layer was provided in the other side is known. For example, Patent Document 1 discloses, from the surface side, a heat insulating container having a layer structure of foamed low density polyethylene (LDPE) / paper / medium density polyethylene (MDPE).

Japanese Patent Application Laid-Open No. 57-110439

  A general heat insulation container and a laminate for heat insulation container for forming the same, including the heat insulation container disclosed in the above-mentioned Patent Document 1, are resins for foaming on the surface of paper as a base material (in Patent Document 1) Provides a low density polyethylene and another resin on the back side (medium density polyethylene in Patent Document 1) to form a laminate for a heat insulation container, which is heated to evaporate water contained in the paper. It is manufactured by so-called steam bubbling in which the resin on the surface side (low density polyethylene in Patent Document 1) is foamed by the water vapor.

  In such a laminate for a heat insulating container, a printed layer for providing a design on the surface side resin may be provided. However, if there is a portion where the printing layer is provided, a portion where the printing layer is not provided, and a portion where the printing layer is provided, the printing layer may have thick and thin portions, respectively. The degree of foaming of the resin on the surface side located under each part may differ depending on the part of the part, which may cause a level difference on the surface of the print layer, which may impair the designability. The

  The present invention is made in such a situation, and is a laminate for a heat insulation container provided with a printing layer on the surface, wherein the surface layer can be foamed to a desired degree, and the printing layer is also after foaming. A laminate for a heat insulation container having excellent surface smoothness and capable of realizing a desired design, a heat insulation container molded using the laminate for the heat insulation container, and a heat insulation container using the laminate for a heat insulation container The main task is to provide a manufacturing method.

  The present invention for solving the above-mentioned problems is characterized in that from the outer surface side, a printed layer, a surface layer, a cover layer, a substrate layer composed of paper, and a water vapor barrier which blocks water vapor generated from the paper constituting the substrate layer. Layers, and the cover layer is made of low density polyethylene, and the surface layer has a melting point measured in accordance with JIS K 6922-2 (2010). Is made of a low density polyethylene resin higher than the melting point of the low density polyethylene constituting the cover layer, the print layer contains a urethane resin as a binder resin, and the urethane resin with respect to all binder resins It is characterized in that the proportion is 18% by mass or more.

  In the above invention, the printing layer has a laminated structure in which a plurality of printing layers are stacked, and all the printing layers contain a urethane resin as a binder resin, and the total solid content of each printing layer is The ratio of the urethane resin to the total mass may be 18% by mass or more.

  In the above invention, the cover layer may be foamed.

  In the above invention, the thickness of the cover layer after foaming may be 300 to 900 μm.

  Another invention of the present invention for solving the above problems is a heat insulation container having a body and a bottom, wherein at least the body is constituted by the laminate for a heat insulation container of the invention. It features.

  Another invention of the present invention for solving the above problems is a method of manufacturing a heat insulation container having a body and a bottom, wherein at least the body is constituted by the laminate for a heat insulation container of the invention. The cover layer of the laminated body for heat insulation containers is made to foam by heating the laminated body for heat insulation containers which comprises the said trunk | drum. It is characterized by the above-mentioned.

  According to the laminate for a heat insulation container of the present invention, a surface layer composed of the same low density polyethylene as the cover layer is provided on the cover layer which is finally in a foamed state, and on the same Since the printing layer containing the predetermined binder resin is provided, even when the printing layer is partially provided or when the thickness of the printing layer is partially different, While being able to make a cover layer into a foaming state uniformly without being affected, the smoothness of the surface of a printing layer can be improved and a desired design can be realized.

  Even in the heat insulating container of the present invention and the method of manufacturing the heat insulating container of the present invention, the same effects as described above are obtained because they are molded using the laminate for a heat insulating container of the present invention.

It is sectional drawing of the laminated body for heat insulation containers of a state which the cover layer does not foam concerning embodiment of this invention. It is sectional drawing of the laminated body for heat insulation containers of the state which the cover layer foamed concerning embodiment of this invention.

  Hereinafter, the laminated body for heat insulation containers concerning the embodiment of this invention, a heat insulation container, and the manufacturing method of a heat insulation container are demonstrated in detail using drawings.

  FIG. 1 is a cross-sectional view of a laminate for a heat insulation container according to an embodiment of the present invention in a state in which a cover layer is not foamed.

  FIG. 2 is a cross-sectional view of a laminate for a heat insulation container according to an embodiment of the present invention in a state in which a cover layer is foamed.

  As shown in FIG. 1, the laminate 10A for heat insulation container according to the present embodiment includes, from the outer surface side, a printing layer 15, a surface layer 16 composed of low density polyethylene, and a cover layer 11A composed of low density polyethylene, It is configured by laminating at least a base material layer 12 made of paper, and a water vapor blocking layer 13 for blocking water vapor generated from the paper constituting the base material layer 12.

  Then, as shown in FIG. 2, by heating the laminate 10A for heat insulation container according to the present embodiment shown in FIG. 1, the low density forming the cover layer by the water vapor generated from the paper forming the base material layer 12 Polyethylene is in a foamed state.

  In the present specification, both the state in which the cover layer (11A) is not foamed and the state in which the cover layer (11) is foamed are expressed as the laminate for thermal insulation container (10A, 10). Do. Moreover, when forming a heat insulation container using the laminated body for heat insulation containers, let the side located in the outer side of the said heat insulation container be "outside side", and let the side located inside heat insulation container be "inner side." In FIG. 1 and FIG. 2, the upper side is the “outer side” and the lower side is the “inner side”.

  Below, each layer which comprises the laminated bodies 10A and 10 for heat insulation containers is demonstrated.

(Cover layer)
The cover layer 11A before foaming is made of at least low density polyethylene. Specifically, a high-pressure ethylene homopolymer is suitably used as the low density polyethylene (LDPE) in the present embodiment. Further, linear low density polyethylene (LLDPE), which is a copolymer of ethylene and an α-olefin other than ethylene such as propylene, butene, pentene, hexene, octene and 4-methylpentene-1, is also suitably used.

  The melt mass flow rate (hereinafter simply referred to as "MFR") of low density polyethylene measured according to JIS K 6922-1 (1997) is preferably in the range of 4 to 100 g / 10 min. More preferably, it is 10-30 g / 10 minutes, More preferably, it is 10-25 g / 10 minutes.

Further, the density (hereinafter simply referred to as "density") of low density polyethylene measured according to JIS K 6922-1 (1997) is preferably 870 to 935 kg / m ³ because it is excellent in foamability, More preferably, it is in the range of 890 to 935 kg / m ³ , still more preferably 900 to 925 kg / m ³ .

  In the low density polyethylene constituting the cover layer 11A in the present embodiment, additives generally used for the polyolefin resin, such as an antioxidant, a light stabilizer, an antistatic agent, a lubricant, an antiblocking agent, as necessary May be added as long as the object of the present invention is not impaired.

  Furthermore, other polyolefins may be mixed with the low density polyethylene. At this time, it is preferable that the mixing ratio is 50 to 99% by weight of the low density polyethylene and 1 to 50% by weight of the other polyolefins, because of excellent foamability.

The polyolefin to be mixed with the low density polyethylene, ethylene-alpha-olefin copolymer, polypropylene, polybutene and the like, because of excellent foaming, the density of less than 850 kg / m ³ or more 920 kg / m ³ ethylene An alpha-olefin copolymer is preferred.

  Examples of α-olefins used for such ethylene / α-olefin copolymers include propylene, 1-butene, 4-methyl-1-pentene, 3-methyl-1-butene, 1-pentene, 1-hexene, 1 -Heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene and the like can be mentioned, and one or more of these may be used.

  Furthermore, the method for obtaining the ethylene / α-olefin copolymer is not particularly limited, and may be exemplified by Ziegler / Natta catalyst, Phillips catalyst, high / medium / low pressure ionic polymerization method using metallocene catalyst, etc. Such copolymers can be conveniently selected from commercially available products.

  When polyolefin is mixed with the low density polyethylene constituting the cover layer 11A in the present embodiment, a pellet mixture of pellets of low density polyethylene and pellets of polyolefin may be mixed in a solid state, but a single screw extruder, A mixture melt-kneaded by a twin-screw extruder, a kneader, Banbury or the like is preferable because a stable product can be obtained. When using a melt-kneading apparatus, the melting temperature is preferably about the melting point of the polyethylene resin to about 300 ° C.

  Furthermore, in the present embodiment, at 190 ° C. of a polyethylene-based resin constituting the surface layer 16 described later, a loss elastic modulus G ′ ′ obtained by measuring dynamic viscoelasticity using a cone-disk rheometer Storage elastic modulus G'a (500) at an angular velocity ω (s-1) of 500 Pa) is smaller than G'b (500) of low density polyethylene used for the cover layer 11A determined by the same method However, it is preferable because stable extrusion molding is possible and an excellent foamed appearance can be obtained, and a G'b (500) of 95 Pa or less is preferable because an excellent foamed appearance can be obtained.

  Although the thickness of the cover layer 11A before such foaming is not particularly limited, it is preferably 10 to 150 μm from the viewpoint of economy, and further preferably 30 to 100 μm, and further preferably 30 to 30 in view of excellent thermal insulation. It is 80 μm.

  The cover layer 11A before foaming shown in FIG. 1 is formed on the base material layer 12 as described above and then heated, as shown in FIG. 2 by the water vapor generated from the paper constituting the base material layer 12 It becomes the cover layer 11 of a foaming state.

  The heating temperature at this time is not lower than the melting point of the low density polyethylene which is the material, and is not particularly limited as long as the laminate 10 for thermal insulation container does not deteriorate, but is usually 100 to 200 ° C., preferably 110 to It is 160 ° C, more preferably 110 to 125 ° C. The heating time is also not particularly limited, but is usually about 10 seconds to 5 minutes. The heating method is not particularly limited, and heating can be performed by a conventionally known method, and examples thereof include heating with hot air, infrared rays, far infrared rays, microwaves, high frequencies, and the like.

  The thickness of the cover layer 11 after foaming is also not particularly limited, but is preferably 20 to 1200 μm, more preferably 300 to 900 μm, and still more preferably 400 to 700 μm from the viewpoint of excellent heat insulation and a foam appearance.

(Surface layer)
In the laminates 10A and 10 for heat insulation containers according to the present embodiment, the surface layer 16 composed of the same low density polyethylene as the cover layers 11A and 11 is provided on the cover layers 11A and 11 It has the feature in the point. By providing the surface layer 16, the cover layer 11A can be uniformly foamed without being affected by the printing layer 15 described later.

The low density polyethylene constituting such a surface layer 16 is the same as the cover layers 11A and 11 described above, and although the description thereof is omitted here, "the same" in the present embodiment means the cover described above. It means that it is included in the range of the definition described in the layers 11A and 11, and within the range of the definition, the low density polyethylene constituting each of the cover layers 11A and 11 and the surface layer 16 is completely identical. It does not have to be. Therefore, for example, the density of both should just be contained in 0.870-0.935 g / cm < ³ >.

  The method of forming the surface layer 16 is also not particularly limited, but may be formed, for example, by co-extrusion coating simultaneously with the formation of the cover layer 11A. When the cover layer 11A and the surface layer 16 are formed by co-extrusion coating, the same low density polyethylene is co-extruded, but by changing the extrusion conditions etc., the orientation of the resin is changed, and between the two layers It is considered that an interface is formed, and due to the influence of the interface, only the cover layer 11A is in a foamed state, and the surface layer 16 can be maintained in an unfoamed state.

  The thickness of the surface layer 16 is also not particularly limited, but generally, about 1 to 20 μm is preferable, and more preferably 4 to 12 μm.

(Printed layer)
In the laminates 10A and 10 according to the embodiment of the present invention, the printing layer 15 is provided on the surface layer 16, and the printing layer 15 contains a urethane resin as a binder resin, and the printing is performed. It is also characterized in that the proportion of the urethane resin is 18% by mass or more based on the total mass of the total solid content of the layer. By using the printing layer 15 containing such a specific binder, the followability of the printing layer 15 can be improved, and when the cover layer 11A is in a foaming state, the foaming of the cover layer 11A is properly followed. The surface smoothness can be ensured, and excellent design can be exhibited. In addition, such a printing layer 15 does not necessarily need to be formed on the entire surface of the surface layer 16 and may be partially formed as shown in FIG. 1 and FIG. 2.

  The printing layer 15 does not necessarily have to be a single layer, and may have a laminated structure in which a plurality of printing layers are stacked. In this case, all the printing layers are made of urethane resin as a binder. It is preferable that the ratio of the said urethane resin is 18 mass% or more with respect to the total mass of all the solid content of each printing layer, respectively.

  Here, the term "urethane resin" as used herein is intended to mean a urethane resin in a broad sense, which includes a conventional urethane resin conventionally used in the art or a modified urethane resin such as a urethane urea resin. Further, the urethane resin used in the present invention is not particularly limited depending on the production method thereof, and may be various urethane resins obtained by applying a known or known method relating to the urethane resin. Although it does not specifically limit, in this invention, the urethane resin obtained by making a polyol compound and organic diisocyanate react is mentioned as one preferable embodiment of a urethane resin. Further, another embodiment includes a modified urethane resin obtained by modifying a prepolymer of a urethane resin with an amine compound or an amide compound.

  Such components of the printing layer 15 are particularly limited, except that the binder resin includes a urethane resin and the proportion of the urethane resin is 18% by mass or more based on the total mass of the total solid content of the printing layer. In order to realize the desired design, various pigments, dyes, and further additives such as wax can be used freely.

  Moreover, as a binder resin used other than a urethane resin, a nitrifying cotton resin, a vinyl-type copolymer, a polyamide resin, an alkyd resin, an acrylic resin, a rosin resin, a dimer acid resin, a maleic acid resin, a chlorinated polypropylene resin And terpene resins, ketone resins, butyral resins, petroleum resins and the like. These can be used alone or in combination of two or more.

  Furthermore, inorganic and organic pigments and dyes generally used in printing inks can be used as colorants. As the inorganic pigment, titanium oxide, zinc oxide, zinc sulfide, barium sulfate, calcium carbonate, aluminum hydroxide, chromium oxide, silica, carbon black, aluminum, mica (mica) and the like can be mentioned. On the other hand, examples of the organic pigment include soluble azo pigments, insoluble azo pigments, azo lake pigments, condensed azo pigments, copper phthalocyanine pigments, condensed polycyclic pigments and the like. The colorants may be used alone or in combination of two or more for the purpose of adjusting the hue and density.

  In addition, as needed, a pigment dispersant, a leveling agent, a wax, a crosslinking agent, a surfactant, an antifoaming agent, a plasticizer, a titanium chelate, and the like to impart functionalization as an ink and improve printing quality and various resistances. Additives such as light stabilizers, infrared absorbers, UV absorbers, fragrances, flame retardants, etc. can also be included.

  The method for forming the printing layer 15 and the surface layer 16 is not particularly limited either, but may be formed by, for example, gravure printing or offset printing.

  The thicknesses of the print layer 15 and the surface layer 16 are not particularly limited, and can be appropriately designed to achieve a desired design, but are usually about 0.1 to 10 μm.

(Base material layer)
The base layer 12 is made of paper. Since this paper is a basic material constituting the heat insulation container, it is possible to use one having formability, bending resistance, rigidity, waist, strength and the like. The paper used is, for example, a main strength material, a strong-sized exposed or unbleached paper substrate, or various paper substrates such as pure white roll paper, kraft paper, paperboard, processed paper, milk base paper, etc. can do. The base material layer 12 may be formed by stacking a plurality of these papers. The paper may have a basis weight of about 80 to 600 g / m ² , preferably about 100 to 450 g / m ² , and a thickness of about 110 to 860 μm, preferably about 140 to 640 μm. .

As described above, since the moisture contained in the paper constituting the base layer 12 is necessary to foam the cover layer 11A, the base layer 12 is covered with the above-mentioned cover layer 11A and the water vapor blocking layer 13 described later. Of the paper constituting the substrate layer 12 in any stage such as the stage before the provision, or at the same time as the provision of these, and also the stage before the laminate 10A for heat insulation container is formed and before it is heated. A moisture adjustment step of adjusting the amount of moisture may be performed. Although depending on how much the cover layer 11A is foamed, it is preferable to adjust, for example, the water content ratio in the paper to about 2 to 8%, and when using a paper having a basis weight of 250 g / m ² If so, it is preferable to carry out the water adjustment step. The specific method of the water adjustment step is not particularly limited, and for example, the paper may be dipped in water, or the water on the mist may be sprayed on the paper.

(Steam barrier layer)
In the laminates 10 </ b> A and 10 according to the present embodiment, the water vapor blocking layer 13 is provided on the inner surface side of the base material layer 12. The layer is a layer that functions to block water vapor generated from the paper constituting the base material layer 12 and to efficiently transmit the generated water vapor to the cover layer 11A side. There is no particular limitation.

  Examples of the material of the water vapor barrier layer 13 include polyethylene resin (C) and clay (D).

The density of the polyethylene resin (C) as the water vapor barrier layer 13 is preferably in the range of 925 to 970 kg / m ³ , more preferably 930 to 970 kg / m ³ , still more preferably 935, because the density is excellent in heat insulation. it is a ~965kg / m ^3.

  Such a polyethylene-based resin (C) has a melting point higher than that of the high-pressure low-density polyethylene (B) constituting the cover layer 11A, and the water vapor blocking performance is also superior to that of the high-pressure low-density polyethylene (B). In addition, since it is also excellent in pinhole resistance, it can be suitably used as the water vapor blocking layer 13 in the laminates 10A and 10 for heat insulation containers according to the present embodiment.

  The polyethylene resin (C) is an ethylene homopolymer, or an ethylene / α-olefin copolymer, and a composition of these, and the form of the molecular chain may be linear, and has 6 or more carbon atoms It may have long chain branching. Such a polyethylene-based resin (C) is not particularly limited, and it is only necessary to leave the density range.

  Examples of the ethylene homopolymer include medium and low pressure ethylene homopolymers and high pressure low density polyethylene. The low and high pressure ethylene homopolymer can be obtained by a conventionally known low and high pressure ionic polymerization method. The high pressure low density polyethylene can be obtained by a conventionally known high pressure radical polymerization method.

  Examples of the α-olefin used for the ethylene / α-olefin copolymer include propylene, 1-butene, 4-methyl-1-pentene, 3-methyl-1-butene, 1-pentene, 1-hexene and 1-heptene And 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene and the like, and one or more of these may be used. The method for obtaining the ethylene / α-olefin copolymer is not particularly limited, and examples include Ziegler / Natta catalysts, Phillips catalysts, high / medium / low pressure ionic polymerization methods using metallocene catalysts, and the like. Such a copolymer can be conveniently selected from commercially available products.

  Additives generally used for polyolefin resins, such as antioxidants, light stabilizers, antistatic agents, lubricants, antiblocking agents, etc., as necessary, to the polyethylene resin (C) impair the purpose of the present invention Although it may be added in the range which does not have it, since it is used as the innermost layer of a heat insulation container, it is preferable not to contain an additive (it is additive-free).

  There is no particular limitation on the method of forming the water vapor barrier layer 13 composed of the polyethylene resin (C), and extrusion coating, lamination of a film prepared in advance, dry lamination, etc. are used similarly to the cover layer 11.

  Further, the thickness of the water vapor barrier layer 13 composed of the polyethylene resin (C) is not particularly limited, but usually, it is preferably about 10 to 50 μm.

  On the other hand, when using clay (D) as the material of the water vapor barrier layer 13, that is, when using the clay coating layer as the water vapor barrier layer 13, the clay coating layer applies the coating liquid containing clay to the substrate layer 12. Also, clay particles are spread on the side of the base layer 12 where the cover layer is not provided. The clay (D) to be used is not particularly limited as long as it is generally referred to as clay or clay, but kaolin, talc, bentonite, smectite, vermiculite, mica, chlorite, wood node clay, gylome clay, halloysite And mica are used. Among clays, among these, kaolin and talc are preferably used. Kaolin is excellent in hiding ability and water absorption, and talc is low in hardness (Mohs hardness 1) and excellent in heat resistance. An improvement in dimensional stability can be expected.

  The clay coat layer preferably contains calcium carbonate, titanium dioxide, amorphous silica, foamable barium sulfate, satin white and the like as pigments in addition to clay. By using calcium carbonate or titanium dioxide as the pigment, the smoothness of the surface of the clay coat layer can be increased, and the concealability can be enhanced. Furthermore, calcium carbonate is preferably used because it is inexpensive.

  The coating liquid for applying the clay coating layer contains the above-mentioned clay, a binder, and, if necessary, other pigments and additives, as a solvent. As the solvent, water, alcohol or the like is usually used. The binder is usually a latex binder (eg, styrene butadiene latex, acrylic latex vinyl acetate latex), a water soluble binder (eg, starch (modified starch, oxidized starch, hydroxyethyl etherified starch, phosphate ester) Starch, polyvinyl alcohol, casein, etc. are used. As the additive, a pigment dispersant, an antifoamer, an antifoaming agent, a viscosity modifier, a lubricant, a water resistant agent, a water retention agent, a coloring material, a printability improver and the like are used.

  Although the compounding ratio of the coating liquid for clay coat layers is not specifically limited, either, It is preferable that it is about clay: pigment: binder = 1-20%: 50-90%: 10-30%.

  The coating method of the clay coating layer is not particularly limited, and conventionally known coating methods are used, but coating methods such as air knife coating, blade coating, short dwell coating, cast coating and the like are used.

The coated amount and thickness of the clay coat layer are not particularly limited, but the basis weight after drying is usually 5 to 40 g / m ² , preferably 10 to 40 g / m ² . If the basis weight after drying is less than 5 g / m ² , the water vapor generated from the paper constituting the base layer 12 can not be blocked efficiently, and the cover layer 11 can not be brought into a desired foamed state If the basis weight after drying exceeds 40 g / m ² , there is a possibility that the thickness of the entire laminate 10 for a heat insulation container may be too thick, and the production suitability may be deteriorated.

  In addition, since the material by which the clay coat layer which consists of the above-mentioned material etc. is already formed is currently marketed to the base material layer 12 which consists of paper, you may use this. In this case, other layers may be provided at appropriate positions.

  Also, in the normal case, a clay coat layer is provided to improve the printability of the paper. Printing on a paper on which a clay coat layer is formed is because printing quality is improved. In the laminate 10 for a heat insulating container according to the present embodiment, the clay coat layer is formed on the inner side of the base material layer 12, that is, on the surface of the laminate 10 for a heat insulation container where the print layer is not provided. The present invention is different from the conventional clay coat layer in that it prevents the water vapor generated from the paper from permeating and allows the water vapor to flow out to the cover layer 11 side.

  The water vapor blocking layer 13 does not necessarily have to be a single layer, and may have a laminated structure of two or more layers. For example, a polyethylene-based resin may be laminated on the inner surface of the clay coat layer in order to impart box-forming properties.

(Other layers)
In the laminates 10 </ b> A and 10 according to the present embodiment, in addition to the layers described above, layers exhibiting various functions may be included.

  For example, in the case of providing a barrier property to the laminate for a heat insulation container according to the present embodiment, a PET film, a film in which an inorganic oxide is vapor deposited, a metal foil such as aluminum foil etc. , And may be provided with a barrier layer made of, for example, MX nylon.

  In order to improve the adhesion between the layers described above, various conventionally known adhesive layers may be provided.

(Insulated container, and manufacturing method of the insulated container)
The heat insulation container concerning the embodiment of the present invention and the manufacturing method of the heat insulation container are explained below.

  The heat insulation container concerning this embodiment is a heat insulation container which has a trunk | drum and a bottom part, Comprising: At least the said trunk | drum is characterized by being comprised by laminated body 10, 10A for heat insulation containers demonstrated above. That is, the cover layer of the laminate for a heat insulation container constituting the trunk of the heat insulation container according to this embodiment may be in a pre-foaming state or a post-foaming state, but the heat insulation as a final product The cover layer of the container is in a state after foaming.

  As a method of manufacturing such a heat insulation container, at least the body portion is configured by the heat insulation container laminate 10A before the cover layer 11A foams, and the heat insulation container laminate 10A is heated to laminate the heat insulation container. The cover layer of the body may be foamed. More specifically, after forming the laminate 10A for heat insulation container (before foaming) according to the present embodiment, it is punched, and the end face is skived and hemmed so that the contents do not contact the end face, and the bottom portion in the molding machine And if necessary, the top portion may be heat sealed by hot air heating, flame heating or the like to form a container shape, and then the cover layer may be foamed by heating to form a heat insulation container.

  The shape of the heat insulation container may be appropriately determined according to the application, purpose, etc. For example, the shape of a goebel top type, brick type, flat top type or the like or a cup type etc. may be mentioned. In addition, a cap made of, for example, polyethylene, an opening mechanism of a pull tab type, or the like may be appropriately provided at the spout of the heat insulating container.

  The contents to be filled in the heat insulation container according to the present embodiment are not particularly limited, and various solids and liquids can be used as the contents. For example, when the shape of the heat insulation container is a cup type, the contents may be dry noodles, miso soup, various soups, and the like.

  Hereinafter, the present invention will be described more specifically by showing Examples and Comparative Examples.

(Production of laminate for heat insulation container)
Water vapor is blocked by extruding and laminating on the back side of the substrate layer made of paper at a temperature of 310 ° C from a T-die, with a take-up speed of 100 m / min, an air gap length of 140 mm and a thickness of 40 μm. A layer was formed. Furthermore, the surface layer and the cover layer were formed on the surface of the base layer by co-pressing the surface layer and the cover layer at a take-up speed of 60 m / min. Next, after printing the entire surface of the white ink on the surface layer with a proofer, the color ink was printed on the pattern to obtain a laminate for a heat insulation container before foaming. Thereafter, the laminate for heat insulation container was cut into a cylindrical shape, and the cover layer was foamed by heating at 120 ° C. for 5 minutes using a convection oven to obtain a laminate for heat insulation container after foaming.

Example 1
The laminated body for heat insulation containers of Example 1 which consists of the following structures by the said preparation method was obtained.
·Layer structure:
Printed layer / surface layer / cover layer / substrate layer / water vapor barrier layer / printed layer:
35% by mass of urethane resin based on the total mass of the total solid content of the printing layer after drying
・ Surface layer:
LDPE (Tosoh Corp. Petrosen 205)
Density 924 kg / m ³
MFR 3g / 10 min Melting temperature 111 ° C
10 μm thick
・ Cover layer:
LDPE (Tosoh Corp. Petrosen 212)
Density 919 kg / m ³
MFR 13 g / 10 min Melt temperature 107 ° C
60 μm thickness before foaming
700 μm thickness after foaming (including surface layer)
Base layer:
Nippon Paper Industries Co., Ltd. cup base paper 280 g / m ^{2 in} basis weight
・ Steam barrier layer:
MDPE (Tosoh Corp. Petrosen LW 04-1)
Density 940 kg / m ³
MFR 7g / 10 min Melting temperature 133 ° C
40 μm thick

(Example 2)
The laminated body for heat insulation containers of Example 2 which consists of the following structures by the said preparation method was obtained.
·Layer structure:
Printed layer / surface layer / cover layer / substrate layer / water vapor barrier layer / printed layer:
35% by mass of urethane resin based on the total mass of the total solid content of the printing layer after drying
・ Surface layer:
LDPE (Tosoh Corp. Petrosen 205)
Density 924 kg / m ³
MFR 3g / 10 min Melting temperature 111 ° C
5 μm thick
・ Cover layer:
LDPE (Tosoh Corp. Petrosen 212)
Density 919 kg / m ³
MFR 13 g / 10 min Melt temperature 107 ° C
60 μm thickness before foaming
700 μm thickness after foaming (including surface layer)
Base layer:
Nippon Paper Industries Co., Ltd. cup base paper 280 g / m ^{2 in} basis weight
・ Steam barrier layer:
MDPE (Tosoh Corp. Petrosen LW 04-1)
Density 940 kg / m ³
MFR 7g / 10 min Melting temperature 133 ° C
40 μm thick

(Example 3)
The laminated body for heat insulation containers of Example 3 which consists of the following structures by the said preparation method was obtained.
·Layer structure:
Printed layer / surface layer / cover layer / substrate layer / water vapor barrier layer / printed layer:
35% by mass of urethane resin based on the total mass of the total solid content of the printing layer after drying
・ Surface layer:
LDPE (Tosoh Corp. Petrosen 205)
Density 924 kg / m ³
MFR 3g / 10 min Melting temperature 111 ° C
Thickness 2.5 μm
・ Cover layer:
LDPE (Tosoh Corp. Petrosen 212)
Density 919 kg / m ³
Melting temperature 107 ° C
MFR 13 g / 10 min Thickness before foaming 70 μm
750 μm thickness after foaming (including surface layer)
Base layer:
Nippon Paper Industries Co., Ltd. cup base paper 280 g / m ^{2 in} basis weight
・ Steam barrier layer:
MDPE (Tosoh Corp. Petrosen LW 04-1)
Density 940 kg / m ³
MFR 7g / 10 min Melting temperature 133 ° C
40 μm thick

(Example 4)
The laminated body for heat insulation containers of Example 4 which consists of the following structures was obtained by said preparation method.
·Layer structure:
Printed layer / surface layer / cover layer / substrate layer / water vapor barrier layer / printed layer:
35% by mass of urethane resin based on the total mass of the total solid content of the printing layer after drying
・ Surface layer:
LDPE (Tosoh Corp. Petrosen 225)
Density 923 kg / m ³
MFR 3.7 g / 10 min Melt temperature 109 ° C
10 μm thick
・ Cover layer:
LDPE (Tosoh Corp. Petrosen 212)
Density 919 kg / m ³
MFR 13 g / 10 min Melt temperature 107 ° C
60 μm thickness before foaming
700 μm thickness after foaming (including surface layer)
Base layer:
Nippon Paper Industries Co., Ltd. cup base paper 280 g / m ^{2 in} basis weight
・ Steam barrier layer:
MDPE (Tosoh Corp. Petrosen LW 04-1)
Density 940 kg / m ³
MFR 7g / 10 min Melting temperature 133 ° C
40 μm thick

(Example 5)
The laminated body for heat insulation containers of Example 5 which consists of the following structures was obtained by said preparation method.
·Layer structure:
Printed layer / surface layer / cover layer / substrate layer / water vapor barrier layer / printed layer:
25% by mass of urethane resin based on the total mass of the total solid content of the printing layer after drying
・ Surface layer:
LDPE (Tosoh Corp. Petrosen 205)
Density 924 kg / m ³
MFR 3g / 10 min Melting temperature 111 ° C
5 μm thick
・ Cover layer:
LDPE (Tosoh Corp. Petrosen 212)
Density 919 kg / m ³
MFR 13 g / 10 min Melt temperature 107 ° C
60 μm thickness before foaming
600μm thickness after foaming (including surface layer)
Base layer:
Nippon Paper Industries Co., Ltd. cup base paper 280 g / m ^{2 in} basis weight
・ Steam barrier layer:
MDPE (Tosoh Corp. Petrosen LW 04-1)
Density 940 kg / m ³
MFR 7g / 10 min Melting temperature 133 ° C
40 μm thick

(Example 6)
The laminated body for heat insulation containers of Example 6 which consists of the following structures was obtained by said preparation method.
·Layer structure:
Printed layer / surface layer / cover layer / substrate layer / water vapor barrier layer / printed layer:
18% by mass of urethane resin based on the total mass of the total solid content of the printing layer after drying
・ Surface layer:
LDPE (Tosoh Corp. Petrosen 205)
Density 924 kg / m ³
MFR 3g / 10 min Melting temperature 111 ° C
5 μm thick
・ Cover layer:
LDPE (Tosoh Corp. Petrosen 212)
Density 919 kg / m ³
MFR 13 g / 10 min Melt temperature 107 ° C
60 μm thickness before foaming
400 μm thickness after foaming (including surface layer)
Base layer:
Nippon Paper Industries Co., Ltd. cup base paper 280 g / m ^{2 in} basis weight
・ Steam barrier layer:
MDPE (Tosoh Corp. Petrosen LW 04-1)
Density 940 kg / m ³
MFR 7g / 10 min Melting temperature 133 ° C
40 μm thick

(Example 7)
In addition to the above manufacturing method, a PET film is laminated on the inner side of polyethylene constituting the water vapor barrier layer, and extrusion lamination with polyethylene is performed so as to have a thickness of 57 μm to obtain a water vapor barrier layer having a three-layer structure. Thus, a laminate for a heat insulating container of Example 7 having the following configuration was obtained.
·Layer structure:
Printed layer / surface layer / cover layer / substrate layer / three-layer water vapor barrier layer / printed layer:
35% by mass of urethane resin based on the total mass of the total solid content of the printing layer after drying
・ Surface layer:
LDPE (Tosoh Corp. Petrosen 205)
Density 924 kg / m ³
MFR 3g / 10 min Melting temperature 111 ° C
10 μm thick
・ Cover layer:
LDPE (Tosoh Corp. Petrosen 212)
Density 919 kg / m ³
MFR 13 g / 10 min Melt temperature 107 ° C
60 μm thickness before foaming
700 μm thickness after foaming (including surface layer)
Base layer:
Nippon Paper Industries Co., Ltd. cup base paper 280 g / m ^{2 in} basis weight
・ Steam barrier layer (1):
MDPE (Tosoh Corp. Petrosen LW 04-1)
Density 940 kg / m ³
Melting temperature 133 ° C
15 μm thickness
・ Steam barrier layer (2):
PET (Toyobo Co., Ltd. T-4100)
12 μm thick
・ Steam barrier layer (3):
MDPE (Tosoh Corp. Petrosen LW 04-1)
Density 940 kg / m ³
Melting temperature 133 ° C
30 μm thick

(Comparative example 1)
The laminated body for heat insulation containers of the comparative example 1 which consists of the following structures by the said preparation method was obtained.
·Layer structure:
Printed layer / surface layer / cover layer / substrate layer / water vapor barrier layer / printed layer:
35% by mass of urethane resin based on the total mass of the total solid content of the printing layer after drying
・ Surface layer:
LDPE (Tosoh Corp. Petrosen 213)
Density 918 kg / m ³
MFR 8g / 10 min Melting temperature 103 ° C
10 μm thick
・ Cover layer:
LDPE (Tosoh Corp. Petrosen 212)
Density 919 kg / m ³
MFR 13 g / 10 min Melt temperature 107 ° C
60 μm thickness before foaming
Thickness after foaming 650μm (including surface layer)
Base layer:
Nippon Paper Industries Co., Ltd. cup base paper 280 g / m ^{2 in} basis weight
・ Steam barrier layer:
MDPE (Tosoh Corp. Petrosen LW 04-1)
Density 940 kg / m ³
MFR 7g / 10 min Melting temperature 133 ° C
40 μm thick

(Comparative example 2)
The laminated body for heat insulation containers of the comparative example 2 which consists of the following structures by the said preparation method was obtained.
·Layer structure:
Printed layer / surface layer / cover layer / substrate layer / water vapor barrier layer / printed layer:
Ratio of urethane resin to total mass of total solid content of dried printing layer: 10% by mass
・ Surface layer:
LDPE (Tosoh Corp. Petrosen 205)
Density 924 kg / m ³
MFR 3g / 10 min Melting temperature 111 ° C
10 μm thick
・ Cover layer:
LDPE (Tosoh Corp. Petrosen 212)
Density 919 kg / m ³
MFR 13 g / 10 min Melt temperature 107 ° C
60 μm thickness before foaming
250 μm thickness after foaming (including surface layer)
Base layer:
Nippon Paper Industries Co., Ltd. cup base paper 280 g / m ^{2 in} basis weight
・ Steam barrier layer:
MDPE (Tosoh Corp. Petrosen LW 04-1)
Density 940 kg / m ³
MFR 7g / 10 min Melting temperature 133 ° C
40 μm thick

(Comparative example 3)
The laminated body for heat insulation containers of the comparative example 3 which consists of the following structures by the said preparation method was obtained.
·Layer structure:
Printed layer / cover layer / substrate layer / water vapor barrier layer · printed layer:
35% by mass of urethane resin based on the total mass of the total solid content of the printing layer after drying
・ Cover layer:
LDPE (Tosoh Corp. Petrosen 212)
Density 919 kg / m ³
MFR 13 g / 10 min Melt temperature 107 ° C
60 μm thickness before foaming
700 μm thickness after foaming (including surface layer)
Base layer:
Nippon Paper Industries Co., Ltd. cup base paper 280 g / m ^{2 in} basis weight
・ Steam barrier layer:
MDPE (Tosoh Corp. Petrosen LW 04-1)
Density 940 kg / m ³
MFR 7g / 10 min Melting temperature 133 ° C
40 μm thick

  About the laminated body for heat insulation containers of the said Examples 1-7 and Comparative Examples 1-3, it evaluated about foam thickness, foam conformity, and the foam external appearance. Each evaluation is as follows.

(Foaming thickness)
The thickness before and after foaming is measured using a thickness gauge (Dial Thickness Gauge G: manufactured by Ozaki Mfg. Co., Ltd.), and the sum of the thickness of the surface layer and the cover layer is calculated based on the difference. And evaluated according to the following criteria.
A: 450 μm or more B: 300 μm or more and less than 450 μm C: less than 300 μm

(Following foamability)
About the surface of the printing layer after foaming, the level | step difference between a white ink printing part and a color ink printing part was touched, and the dent degree of the color ink printing part was evaluated according to the following references | standards.
A: Almost no difference in level with the white ink printing section.
B: I feel a slight level difference with the white ink printing unit.
C: I feel a level difference with the white ink printing section considerably.

(Foamed appearance)
The appearance state of the color ink printed part after foaming was visually observed and touched, and the smoothness of the surface was evaluated according to the following criteria.
A: The surface is smooth and does not feel asperity.
B: I feel a slight unevenness.
C: It is quite uneven and feels rough.

(Evaluation results)
Table 1 shows the evaluation results for each of the foam thickness, the foam followability, and the foam appearance.

  As apparent from Table 1 above, according to the laminate for a heat insulation container according to the example of the present invention, it is understood that any evaluation results of foam thickness, foam conformity and foam appearance are excellent. On the other hand, in the laminate for a heat insulating container according to Comparative Example 1, since the melting point of the resin forming the surface layer is lower than the melting point of the resin forming the cover layer, the evaluation of the foam followability and the foam appearance is low. It has become. Moreover, in the laminate for heat insulation containers according to Comparative Example 2, since the ratio of the polyurethane resin to the total mass of the total solid content of the printing layer is less than 18% by mass, the foamed thickness is insufficient. Moreover, in the laminated body for heat insulation containers concerning the comparative example 3, since a surface layer is not provided, evaluation of foam conformity and foam external appearance is low.

10 ... Laminated body for heat insulation container (after foaming)
10A ... Laminated body for heat insulation container (before foaming)
11 ... Cover layer (after foaming)
11A ... cover layer (before foaming)
12 ... base material layer 13 ... water vapor blocking layer 15 ... printing layer 16 ... surface layer

Claims (6)

From the outer surface side, for a heat insulation container formed by laminating at least a printing layer, a surface layer, a cover layer, a substrate layer composed of paper, and a water vapor blocking layer for blocking water vapor generated from the paper constituting the substrate layer A laminate,
The cover layer is made of low density polyethylene,
The surface layer is made of a low density polyethylene resin whose melting point measured in accordance with JIS K 6922-2 (2010) is higher than the melting point of the low density polyethylene constituting the cover layer,
The laminate for a heat insulating container, wherein the print layer contains a urethane resin as a binder resin, and the ratio of the urethane resin to the total binder resin is 18% by mass or more. The print layer has a laminated structure in which a plurality of print layers are stacked,
All print layers contain urethane resin as binder resin,
And the ratio of the urethane resin concerned is 18 mass% or more to the total mass of the total solid of each printing layer,
The laminated body for heat insulation containers of Claim 1 characterized by the above-mentioned. The cover layer is foamed,
The laminated body for heat insulation containers of Claim 1 or 2 characterized by the above-mentioned. The thickness of the cover layer after foaming is 300 to 900 μm,
The laminated body for heat insulation containers of Claim 3 characterized by the above-mentioned. An insulated container having a body and a bottom,
At least the said trunk | drum is comprised by the laminated body for heat insulation containers as described in any one of the said Claims 1-4,
An insulated container characterized by A method of manufacturing an insulating container having a body and a bottom, comprising:
At least the said trunk | drum is comprised by the laminated body for heat insulation containers of the said Claim 1 or 2,
Thereafter, the cover layer of the heat insulating container laminate is foamed by heating the heat insulating container laminate forming the body portion.
A method of manufacturing an insulated container characterized by

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