Laminate and package

Abstract

To provide a laminate constituted so that the respective base material layers of the laminate are easily separated and recovered at the time of disposal after use and capable of performing environmental conservation and reuse recycling.SOLUTION: The laminate 1 has a base material layer 20, a pattern-like heat seal layer 3 having easy peelability and a seal layer 6 in this order and does not contain a base material layer other than the base material layer 20 and the base material layer 20 and the seal layer 6 are constituted of different materials.SELECTED DRAWING: Figure 19

Description

[Technical Field]

[0001] The present disclosure relates to a laminate that constitutes a package or the like that is easily recyclable, and to a package using the same. [Background technology]

[0002] For example, laminates used in packaging materials include composite material laminates formed by laminating paper and synthetic resin film, synthetic resin film and synthetic resin film, etc., by adhesive or other methods. These laminates are required to have strong adhesive strength so as not to peel off due to the force, heat, etc. applied during use.

[0003] Such packages, for example, packages used for packaging food, are often made of laminate film. A laminate film for food packaging includes a substrate layer made of, for example, a PET (polyethylene terephthalate) film or an ONY (oriented nylon) film that forms the surface, a sealant layer used on the inner surface as a heat-sealing material, and an adhesive layer that bonds the substrate layer and the sealant layer together. Depending on the application, for example, a barrier film that protects the contents from oxygen, water vapor, light, etc. may be used as the substrate layer.

[0004] In recent years, there has been a demand for packaging materials that make up such packages to be recyclable, but packaging materials made by bonding multiple types of plastic materials together have the problem that they cannot be recycled as is. Although the base layer and the sealant layer can be recycled separately by separating them, as mentioned above, high adhesiveness is required when using the packaging material, which makes separation difficult.

[0005] For example, Patent Document 1 proposes that, for the purpose of recyclability, in a laminate in which a paper layer and a thermoplastic resin layer are laminated, the peel strength between the paper layer and the thermoplastic resin layer is set within a predetermined range. In such a laminate, the thermoplastic resin layer can be peeled from the paper layer to separate the paper and plastic, allowing them to be reused. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 4852913 Summary of the Invention [Problem to be solved by the invention]

[0007] However, even in the laminate described above, the thermoplastic resin layer is laminated onto the paper layer by extrusion coating, so the peeling force is relatively high, and it is by no means easy for anyone to peel off the paper layer and the thermoplastic resin layer.

[0008] The present disclosure has been made in consideration of the above-mentioned circumstances, and has as its main object to provide a laminate in which the respective base material layers of the laminate can be easily separated and recovered when disposed of after use, thereby enabling environmental conservation and reuse / recycling. [Means for solving the problem]

[0009] One embodiment of the present disclosure provides a laminate having, in this order, a first base material layer, a patterned heat seal layer having easy peelability, a second base material layer, and a seal layer, wherein the first base material layer and the second base material layer are made of different materials.

[0010] In the laminate, the peel strength when the first base material layer and the second base material layer are peeled off is preferably 0.1 N / 15 mm or more and 3.5 N / 15 mm or less.

[0011] The laminate may also have a first printed layer between the first base material layer and the heat seal layer, or on the surface of the first base material layer opposite to the heat seal layer.

[0012] The laminate may also have a second printed layer between the second base material layer and the heat seal layer, or between the second base material layer and the seal layer.

[0013] The laminate may also have a barrier layer at any position between the heat seal layer and the seal layer.

[0014] Furthermore, another embodiment of the present disclosure provides a laminate having a base material layer, a patterned heat seal layer having easy peelability, and a seal layer in this order, and not including any other base material layer other than the base material layer, wherein the base material layer and the seal layer are made of different materials.

[0015] In the laminate, the peel strength when peeled between the base layer and the seal layer is preferably 0.1 N / 15 mm or more and 3.5 N / 15 mm or less.

[0016] It is preferable that a first printed layer be provided between the base layer and the heat seal layer, or on the surface of the base layer opposite to the heat seal layer.

[0017] The present disclosure further provides a package having the above laminate. [Effects of the Invention]

[0018] The present disclosure has an effect of providing a laminate that can be easily separated and recovered from each base material layer of the laminate when disposed of, thereby enabling environmental conservation and reuse / recycling. [Brief explanation of the drawings]

[0019] [Figure 1] 1A and 1B are a schematic plan view and a cross-sectional view illustrating a laminate according to the present disclosure. [Figure 2] 1A and 1B are a schematic plan view and a cross-sectional view illustrating a laminate according to the present disclosure. [Figure 3] 1A and 1B are a schematic plan view and a cross-sectional view illustrating a laminate according to the present disclosure. [Figure 4] 1 is a schematic plan view illustrating a laminate according to the present disclosure. [Figure 5] 1A and 1B are a schematic plan view and a cross-sectional view illustrating a laminate according to the present disclosure. [Figure 6] 1A and 1B are a schematic plan view and a cross-sectional view illustrating a laminate according to the present disclosure. [Figure 7] 1 is a schematic cross-sectional view illustrating a laminate according to the present disclosure. [Figure 8] 1 is a schematic cross-sectional view illustrating a laminate according to the present disclosure. [Figure 9] 1A and 1B are schematic plan and cross-sectional views illustrating a packaging body according to the present disclosure. [Figure 10] 1A and 1B are schematic plan and cross-sectional views illustrating a packaging body according to the present disclosure. [Figure 11] 1A and 1B are schematic plan and cross-sectional views illustrating a packaging body according to the present disclosure. [Figure 12] 1 is a schematic plan view illustrating a packaging body according to the present disclosure. [Figure 13] 1 is a schematic plan view illustrating a packaging body according to the present disclosure. [Figure 14] 1 is a schematic plan view illustrating a packaging body according to the present disclosure. [Figure 15] 1 is a schematic plan view illustrating a packaging body according to the present disclosure. [Figure 16] 1 is a schematic plan view illustrating a packaging body according to the present disclosure. [Figure 17] 1 is a schematic plan view illustrating a packaging body according to the present disclosure. [Figure 18] 1 is a schematic plan view illustrating a packaging body according to the present disclosure. [Figure 19] 1A and 1B are a schematic plan view and a cross-sectional view illustrating another embodiment of a laminate according to the present disclosure. [Figure 20] 10A and 10B are schematic plan and cross-sectional views illustrating another embodiment of a packaging body according to the present disclosure. [Figure 21] 10A and 10B are schematic plan and cross-sectional views illustrating another embodiment of a packaging body according to the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0020] Embodiments of the present disclosure will be described below with reference to the drawings and the like. However, the present disclosure can be implemented in many different forms, and should not be construed as being limited to the description of the embodiments exemplified below. Furthermore, to clarify the explanation, the drawings may schematically depict the width, thickness, shape, etc. of each part compared to the actual form, but these are merely examples and are not intended to limit the interpretation of the present disclosure. Furthermore, in this specification and each drawing, elements similar to those previously described with reference to the preceding drawings will be designated by the same reference numerals, and detailed descriptions may be omitted as appropriate.

[0021] In this specification, when describing a mode in which another component is placed on a certain component, the term "above" or "below" is used, unless otherwise specified, to include both a case in which another component is placed directly above or below a certain component so as to be in contact with the component, and a case in which another component is placed above or below a certain component with another component interposed therebetween. Also, in this specification, when describing a mode in which another component is placed on the surface of a certain component, the term "on the surface" is used, unless otherwise specified, to include both a case in which another component is placed directly above or below a certain component so as to be in contact with the component, and a case in which another component is placed above or below a certain component with another component interposed therebetween.

[0022] The laminate and package of the present disclosure will be described in detail below.

[0023] A. Laminate The laminate of the present disclosure has two embodiments, each of which will be described below.

[0024] I. First embodiment The laminate in this embodiment is characterized by having, in this order, a first base material layer, a patterned heat seal layer having easy peelability, a second base material layer, and a seal layer, and the first base material layer and the second base material layer are made of different materials.

[0025] The laminate of this embodiment will be described with reference to the drawings. Figures 1(a) and 1(b) are a schematic plan view and a cross-sectional view showing an example of the laminate of this embodiment, where Figure 1(a) is a plan view of the laminate as seen from the first base material layer side, and Figure 1(b) is a cross-sectional view taken along line AA in Figure 1(a). As shown in Figures 1(a) and 1(b), the laminate 1 has, in this order, a first base material layer 2, a patterned heat seal layer 3 having easy peelability, a second base material layer 4, and a seal layer 6. The first base material layer 2 and the second base material layer 4 are made of different materials.

[0026] 1(a) and 1(b), the heat seal layer 3 has a circular dot pattern. Also, as shown in FIG. 1(a), an adhesive layer 5 can be disposed between the second base material layer 4 and the seal layer 6.

[0027] The heat seal layer 3 has easy peelability, and therefore the first base material layer 2 and the heat seal layer 3 can be peeled from the laminate 1, for example, as shown in Figures 2(a) and 2(b). Figure 2(a) is a plan view of the laminate when the first base material layer and part of the heat seal layer have been peeled from the laminate, as viewed from the first base material layer side, and Figure 2(b) is a cross-sectional view of the laminate when the first base material layer and the heat seal layer have all been peeled from the laminate.

[0028] In the laminate of this embodiment, a patterned heat seal layer having easy peelability is arranged between the first base material layer and the second base material layer, so that the first base material layer and the heat seal layer can be peeled from the laminate. The first and second base layers are made of different materials, and so by making it possible to easily peel the first and second base layers, for example, when used as a package, separation after use becomes easy, thereby improving environmental conservation, such as recyclability and ease of separate disposal.

[0029] Hereinafter, each component of the laminate in this embodiment will be described.

[0030] 1. Heat seal layer The heat seal layer in this embodiment is a member that has easy peelability and is arranged in a pattern on one surface of the first base material layer.

[0031] Here, "easy peelability" refers to the property that two layers that are in contact with both sides of the heat seal layer can be adhered via the heat seal layer, and that the heat seal layer can be easily peeled from the layer that is in contact with the surface of the heat seal layer on the second base material layer side.

[0032] The heat seal layer may be arranged in a pattern on one surface of the first base layer, and may be arranged in a pattern on the entire surface of the first base layer, or may be arranged in a pattern locally. For example, Fig. 1(a) shows an example in which the heat seal layer 3 is arranged in a pattern on the entire surface of the first base layer 2, and Fig. 3(a) shows an example in which the heat seal layer 3 is arranged in a pattern locally on one surface of the first base layer 2.

[0033] In particular, it is preferable that the heat seal layer be arranged in a pattern on one surface of the first base material layer. The first base material layer and the second base material layer can be uniformly bonded via the heat seal layer. This makes it difficult for the heat seal layer to peel from the laminate until the first base material layer and the heat seal layer are peeled from the laminate. Furthermore, when the laminate is used for a package or label, the arrangement of the patterned heat seal layer does not need to be adjusted to the size of the package or label, and the laminate can be used regardless of the size of the package or label.

[0034] Furthermore, when the heat seal layer is locally arranged in a pattern on one surface of the first base material layer, it is preferably arranged on the peripheral portion of the first base material layer. In this case, when the shape of the laminate in a plan view is rectangular, the heat seal layer is preferably arranged on the peripheral portions of three or four sides of the first base material layer, and more preferably on the peripheral portions of four sides of the first base material layer. By arranging the heat seal layer on the peripheral portions of the four sides of the first base material layer, it is possible to make the heat seal layer less likely to peel from the laminate until the first base material layer and the heat seal layer are peeled from the laminate.

[0035] Furthermore, when the heat seal layer is locally arranged in a pattern on one surface of the first base material layer, it is preferable that the heat seal layer is arranged continuously. When the heat seal layer is arranged continuously, the heat seal layer can be made less likely to peel from the laminate until the first base material layer and the heat seal layer are peeled from the laminate, compared to when the heat seal layer is arranged discontinuously.

[0036] For example, in Fig. 3(a), the heat seal layer 3 is continuously disposed along the peripheral edges of the four sides of the first base material layer 2. Fig. 3(b) is a cross-sectional view taken along line AA in Fig. 3(a).

[0037] Furthermore, the ratio of the total area of ​​the patterned heat seal layer to the area of ​​the first base layer, i.e., the area ratio of the patterned heat seal layer, is, for example, 10% or more and 95% or less, or may be 20% or more and 60% or less, or may be 30% or more and 50% or less.

[0038] The pattern shape of the heat seal layer in plan view may be, for example, a regular pattern or a random pattern. Examples of regular patterns include dots, lines, stripes, lattices, spirals, concentric figures, and frames.

[0039] In the dot pattern, the dots may have various shapes, such as a circle, an ellipse, a rectangle, a polygon, a cross, a Y-shape, a star, or a heart. The dot pattern may also be a letter. For example, FIG. 1(a) shows an example in which the heat seal layer 3 has a circular dot pattern in a plan view, and FIG. 4 shows an example in which the heat seal layer 3 has a dot pattern in a plan view, which is the letters "ABC."

[0040] In the dot pattern, the dots may be arranged in, for example, a square lattice arrangement, a rectangular lattice arrangement, a triangular lattice arrangement, a hexagonal lattice arrangement, a rhombic lattice arrangement, a parallelogram lattice arrangement, or the like.

[0041] Examples of the line or stripe pattern include straight lines, curved lines such as wavy lines of sine waves, triangular waves, rectangular waves, sawtooth waves, etc. For example, Fig. 5(a) shows an example in which the pattern shape of the heat seal layer 3 in a plan view is a straight stripe shape. FIG. 5(b) is a cross-sectional view taken along line AA in FIG. 5(a).

[0042] Examples of the lattice pattern include a square lattice, a rectangular lattice, a triangular lattice, a hexagonal lattice, a rhombic lattice, a parallelogram lattice, etc. For example, Fig. 6(a) shows an example in which the pattern shape in a plan view of the heat seal layer 3 is a square lattice. Fig. 6(b) is a cross-sectional view taken along line AA in Fig. 6(a).

[0043] Examples of concentric patterns include concentric circles, concentric triangles, concentric squares, and concentric hexagons.

[0044] Also, for example, FIG. 3(a) shows an example in which the pattern shape of the heat seal layer 3 in plan view is frame-shaped.

[0045] Furthermore, when the pattern shape of the heat seal layer in plan view is a dot shape, the size of the dot in plan view may be, for example, 1 mm to 15 mm, or 3 mm to 8 mm. If the dot size is too small, the adhesion between the first base layer and the second base layer via the heat seal layer may be reduced or formation may be difficult. If the dot size is too large, it may be difficult to peel the first base layer and the heat seal layer from the laminate.

[0046] Here, the planar size of a dot refers to, for example, the diameter if the dot shape is circular, the major axis if the dot shape is elliptical, the length of the diagonal if the dot shape is rectangular, or the diameter of the circle or the diagonal of the rectangle when the dot shape is some other shape and is approximated to a circle or rectangle.

[0047] Furthermore, when the heat seal layer has a dotted pattern in plan view, the dot pitch can be, for example, 1.5 times or more and less than 10 times the size of the dots in plan view. If the dot pitch is too small, it may be difficult to form the dots. If the dot pitch is too large, the adhesion between the first base layer and the second base layer via the heat seal layer may be reduced. Here, the dot pitch refers to the distance between adjacent dots.

[0048] When the heat seal layer has a line or stripe pattern in plan view, the line width may be, for example, 1 mm or more and 15 mm or less, or 2 mm or more and 8 mm or less. If the line width is too small, the adhesion between the first and second base layers via the heat seal layer may be reduced or the formation may be difficult, whereas if the line width is too large, it may be difficult to peel the first base layer and the heat seal layer from the laminate.

[0049] Furthermore, when the heat seal layer has a striped pattern in plan view, the pitch of the stripes may be, for example, 1 mm to 20 mm, or 3 mm to 10 mm. If the pitch of the stripes is too small, formation may be difficult. If the pitch of the stripes is too large, adhesion between the first base layer and the second base layer via the heat seal layer may be reduced. Here, the stripe pitch refers to the distance between adjacent lines.

[0050] Furthermore, when the pattern shape of the heat seal layer in plan view is a grid, the line width may be, for example, 1 mm to 15 mm, or 2 mm to 8 mm. If the line width is too small, the adhesion between the first base layer and the second base layer via the heat seal layer may be reduced, or formation may be difficult. If the line width is too large, it may be difficult to peel the first base layer and the heat seal layer from the laminate.

[0051] Furthermore, when the heat seal layer has a grid pattern in plan view, the grid spacing may be, for example, 1 mm to 20 mm, or 3 mm to 10 mm. If the grid spacing is too small, it may be difficult to form. If the grid spacing is too large, the adhesion between the first base layer and the second base layer via the heat seal layer may be reduced.

[0052] Furthermore, when the heat seal layer is locally arranged in a pattern on one surface of the first base material layer and arranged on the periphery of the first base material layer, the width of the heat seal layer may be, for example, 1 mm to 15 mm, or 2 mm to 8 mm. If the line width is too small, the adhesion between the first base material layer and the second base material layer via the heat seal layer may be reduced or formation may be difficult. Furthermore, if the width of the heat seal layer is too large, it may be difficult to peel the first base material layer and the heat seal layer from the laminate.

[0053] The dimensions of the heat seal layer can be measured by observing the surface of the laminate with a laser microscope, a stylus surface profiler, or a scanning electron microscope (SEM).

[0054] The thickness of the heat seal layer is, for example, 0.3 μm to 5.0 μm, or alternatively, 0.5 μm to 4.0 μm, or alternatively, 0.7 μm to 3.0 μm. If the heat seal layer is too thin, the adhesion between the first base layer and the second base layer via the heat seal layer may be reduced. If the heat seal layer is too thick, it may be difficult to peel the first base layer and the heat seal layer from the laminate.

[0055] The heat seal layer can be made of a heat seal material commonly used in packaging applications. Examples of the main components of heat seal materials include ethylene-vinyl acetate copolymer (EVA), acrylic resin, vinyl chloride resin, polyester resin, ethylene-methacrylic acid copolymer, acid-modified polyolefin resin, chlorinated polyolefin resin, and styrene-butadiene copolymer. These materials may be used alone or in combination of two or more.

[0056] The heat seal layer may contain additives as needed. For example, if the heat seal layer contains a colorant, peeling the first base material layer and the heat seal layer from the laminate allows the design and color to be changed, and peeling of the first base material layer and the heat seal layer from the laminate can be visually confirmed. This can improve the design and provide tamper-evident properties.

[0057] The heat seal layer can be formed, for example, by applying a heat sealant in a pattern to one surface of the first base material layer, and then thermally laminating the surface of the first base material layer to which the heat sealant is applied and the second base material layer. Examples of methods for applying the heat sealant in a pattern include gravure printing, flexographic printing, offset printing, and screen printing.

[0058] 2.First base layer The first base material layer in this embodiment is a member that supports the heat seal layer, and is made of a material different from that of the second base material layer described below. Here, in this embodiment, "composed of different materials" preferably means that the two materials constituting the first base material layer and the second base material layer are materials that should be disposed of separately, or that the two materials are difficult to recycle when mixed together. An example of a case where the two materials should be separated for disposal is when they are different types of materials selected from the group consisting of resin, metal, and paper. In addition, when the above two materials are mixed, it is difficult to recycle them, for example, when both are resins and the two materials are different materials selected from polyester, polyamide, and polyolefin.

[0059] The first base layer is not particularly limited as long as it is a layer capable of supporting the heat seal layer and is made of a material different from the material making up the second base layer described below. Specific examples include those made of a resin base material, a paper base material, a metal foil, etc. This is because the difference in material from the second base layer may allow for separate disposal.

[0060] In this embodiment, the material of the first base material layer is preferably made of a recyclable material.

[0061] In this embodiment, the resin constituting the resin substrate is not particularly limited, and examples thereof include polyester-based resins such as polyethylene terephthalate; polyamide-based resins such as nylon; and polyolefin-based resins such as polypropylene. In this embodiment, among the resin substrates, from the viewpoint of recyclability, for example, polyolefin-based resins (polyethylene, polypropylene, etc.), polyester-based resins (polyethylene terephthalate, polybutylene terephthalate, polylactic acid (PLA), polybutylene succinate (PBS), etc.), and polyamide-based resins (nylon, etc.) are preferred, and polyolefin-based resins are particularly preferred.

[0062] The resin substrate may be, for example, a stretched film or a non-stretched film. A stretched film is preferably used because of its good processability.

[0063] On the other hand, the paper substrate is not particularly limited, and any paper substrate used in flexible packaging can be used, such as kraft paper, fine paper, glassine paper, rayon paper, coated paper, and barrier paper (paper to which barrier properties have been imparted by coating or inorganic metal vapor deposition).

[0064] The metal foil is not particularly limited, and a paper substrate used in flexible packaging can be used. Examples of metals constituting the metal foil include aluminum and aluminum alloys.

[0065] When the first substrate layer is a resin substrate or a paper substrate, it may contain additives as needed. For example, when the first substrate layer contains a colorant, peeling the first substrate layer and the heat seal layer from the laminate allows the design and color to be changed, and peeling of the first substrate layer and the heat seal layer from the laminate can be visually confirmed. Therefore, it is possible to improve the design and impart tamper-evident properties. In this embodiment, it is preferable that no colorant is contained, because, for example, in the case of recycling a resin material, coloring components may remain during recycling.

[0066] The first base layer may be transparent or opaque, and may be composed of a single layer or a multilayer structure made up of multiple layers.

[0067] The thickness of the first substrate layer can be the same as that of substrate layers generally used in flexible packaging, and is selected appropriately depending on the type of the first substrate layer, etc. The thickness of the first substrate layer can be, for example, 10 μm or more and 150 μm or less. If the thickness of the first substrate layer is within the above range, the first substrate layer can have sufficient strength and flexibility.

[0068] 3.Second base material layer The second base material layer in this embodiment is a member that supports the sealing layer, and is made of a material different from that of the first base material layer.

[0069] The second substrate layer is not particularly limited as long as it is a layer capable of supporting the sealing layer and is made of a material different from that of the first substrate layer, and examples thereof include a resin substrate, a paper substrate, and a metal foil. The resin substrate, paper substrate, and metal foil are the same as those described above for the first substrate layer. The second base layer may be composed of a single layer, or may be composed of multiple layers.

[0070] The thickness of the second substrate layer can be the same as that of substrate layers generally used in flexible packaging, and is selected appropriately depending on the type of second substrate layer, etc. The thickness of the second substrate layer can be, for example, 6 μm or more and 150 μm or less. When the thickness of the second substrate layer is within the above range, a laminate can be obtained that has high mechanical strength, good hand-tearability and dead-holdability, and flexibility as a package.

[0071] In this embodiment, at least one of the first and second substrate layers is preferably a resin substrate, and examples of the resin constituting the resin substrate include the same resins as those listed for the first substrate layer.

[0072] In this embodiment, a preferred combination of materials for the first substrate layer and the second substrate layer is, for example, a case where one is a paper substrate and the other is a resin substrate using polyolefin.

[0073] 4. Sealing layer The sealing layer in this embodiment is a member located on the outermost surface of the laminate opposite to the first base layer, and serves as the innermost layer when a package is manufactured using the laminate.

[0074] The sealing layer may be, for example, a heat-seal type sealing layer, a hot-melt type sealing layer, a cold-seal type sealing layer, or the like, and is appropriately selected depending on the intended use of the laminate. Among these, a heat-sealable seal layer is preferred from the viewpoint of versatility.

[0075] (1) Heat-sealed seal layer The heat-sealable seal layer has heat-sealing properties that allow it to be fused by heat.

[0076] Examples of heat-sealable seal layers include films containing thermoplastic resins, specifically films containing polyolefin resins such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-propylene random copolymer, ethylene-propylene block copolymer, and ethylene-methacrylic acid copolymer. Of these, polyethylene and polypropylene are preferably used.

[0077] Examples of polyethylene include low-density polyethylene (LDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE), etc. Polyethylene may be a homopolymer or a copolymer in which part of the ethylene is replaced with another monomer.

[0078] Examples of polypropylene include homopolypropylene, random polypropylene, block polypropylene, etc. The polypropylene may be a homopolymer or a copolymer in which a portion of propylene is replaced with another monomer.

[0079] Specifically, it is preferable to use non-oriented polypropylene (CPP) or low-density polyethylene (LDPE) such as linear low-density polyethylene (LLDPE).

[0080] Furthermore, the heat-sealable seal layer may contain various additives during film formation, for example, to improve or modify the film's processability, heat resistance, weather resistance, mechanical properties, dimensional stability, antioxidant properties, slipperiness, releasability, flame retardancy, mildew resistance, electrical properties, strength, and other properties. Common additives include, for example, crosslinking agents, antioxidants, UV absorbers, light stabilizers, fillers, reinforcing agents, antistatic agents, pigments, modifying resins, and the like. The content of the additives can be appropriately set depending on the purpose.

[0081] The heat-sealable seal layer may be composed of a single layer or a multi-layer structure made up of a plurality of layers.

[0082] The thickness of the heat-sealable seal layer can be, for example, 15 μm or more and 200 μm or less.

[0083] Examples of methods for producing a heat-sealable seal layer include methods for producing a film using various resins alone or by mixing two or more resins using extrusion molding, cast molding, T-die molding, cutting, inflation molding, etc., and methods for multilayer co-extrusion using two or more resins.

[0084] In addition, examples of the method for laminating a heat-sealable seal layer and a second base material layer include a method for laminating a heat-sealable seal layer on one side of the second base material layer via an adhesive layer (described later), and a method for laminating a heat-sealable seal layer on one side of the second base material layer without an adhesive layer. Examples of lamination methods using an adhesive layer include dry lamination, solventless lamination, and extrusion lamination (sand lamination). Examples of lamination methods not using an adhesive layer include extrusion lamination.

[0085] (2) Hot-melt seal layer The hot melt type sealing layer is a sealing layer made of a hot melt adhesive. When the laminate of this embodiment is used for a label, a hot-melt type seal layer is preferably used.

[0086] Hot melt adhesives are adhesives containing thermoplastic resins that are solid at room temperature (23°C) and are applied after being liquefied by heating and melting, and then solidify upon cooling to exert their adhesive properties. Hot melt adhesives contain a thermoplastic resin as the main component, and are appropriately blended with optional additives. They are 100% solids and contain no solvents.

[0087] Examples of hot melt adhesives include ethylene-vinyl acetate copolymer (EVA)-based hot melt adhesives, olefin-based hot melt adhesives, rubber-based hot melt adhesives, polyester-based hot melt adhesives, polyamide-based hot melt adhesives, and polyurethane-based hot melt adhesives.

[0088] The hot melt adhesive may contain any additives. Examples of additives include wax, tackifier, plasticizer, stabilizer, antioxidant, UV absorber, antistatic agent, colorant, inorganic filler, flame retardant, lubricant, reinforcing material, processing aid, slip agent, anti-blocking agent, release agent, etc. The content of the additives can be appropriately set depending on the purpose.

[0089] The thickness of the hot-melt seal layer is, for example, 1 μm to 20 μm, and may be 5 μm to 10 μm. If the thickness of the hot-melt seal layer is too thin, the dead-hold property may be impaired. On the other hand, if the thickness of the hot-melt seal layer is too thick, manufacturing and processing may become difficult and the cost may increase.

[0090] A method for forming a hot melt type seal layer includes, for example, a method in which a hot melt adhesive is liquefied by heating and melting it and then applied to one surface of the second base material layer.

[0091] (3) Cold seal type sealing layer The cold seal type sealing layer is a sealing layer made of a cold seal agent. The cold seal type sealing layer does not exhibit adhesiveness, but can be bonded by placing two cold seal type sealing layers face to face and applying pressure, without the need for heating.

[0092] The main component of the cold sealant may be, for example, rubber latex. The cold sealant may contain any additives as required. The thickness of the cold seal type seal layer is, for example, 1 μm or more and 20 μm or less, and may be 5 μm or more and 10 μm or less.

[0093] A method for forming a cold seal type seal layer includes, for example, applying a cold seal agent to one surface of the second base material layer.

[0094] 5.Adhesive layer In the laminate of this embodiment, an adhesive layer 5 can be disposed between the second base material layer 4 and the seal layer 6, for example, as shown in FIG. 1(b).

[0095] Examples of materials for the adhesive layer include adhesives and resins for sand lamination.

[0096] As the adhesive constituting the adhesive layer, a general adhesive for lamination can be used, and examples thereof include ester-based adhesives, ether-based adhesives, and urethane-based adhesives.

[0097] Examples of resins for sand lamination include low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), etc. Among these, low-density polyethylene (LDPE) is preferred from the viewpoints of versatility and processability.

[0098] The thickness of the adhesive layer is appropriately selected depending on the material of the adhesive layer, etc. In the case of an adhesive layer using an adhesive, the thickness of the adhesive layer is, for example, 1 μm to 6 μm, or may be 2 μm to 5 μm. In addition, in the case of an adhesive layer using a sand lamination resin, the thickness of the adhesive layer is, for example, 5 μm to 30 μm, or may be 10 μm to 20 μm.

[0099] 6.First printing layer The laminate of this embodiment preferably has a first printed layer between the first base layer and the heat seal layer, or on the surface of the first base layer opposite the heat seal layer. The presence of the first printed layer allows visual confirmation of the peeling of the first base layer, the first printed layer, and the heat seal layer from the laminate, thereby providing tamper-evident properties. This allows the virginity of the package to be easily and reliably confirmed when the laminate is used in a package. Furthermore, when the first printed layer is present, the design and color can be changed by peeling the first base layer, the first printed layer, and the heat seal layer from the laminate, thereby improving the design.

[0100] The first printed layer is a layer on which information, pictures, etc. are printed. When the laminate is used for packaging, labels, etc., information printed on the first printed layer may include, for example, a diagram of the contents, the product name of the contents, a manufacturing number, ingredient labeling, identification labeling, a barcode, etc. When the laminate is used for packaging, labels, etc. for food, information such as the expiration date of the contents and the date of manufacture may also be included. Furthermore, examples of pictures printed on the first printed layer include figures, patterns, letters, symbols, designs, marks, etc.

[0101] When the laminate in this embodiment has a second printed layer (described later) in addition to the first printed layer, it is preferable that the information, design, etc. printed on the first printed layer be different from the information, design, etc. printed on the second printed layer, which can improve design and tamper-evident properties.

[0102] 7(a), the first printed layer 7a may be disposed between the first base material layer 2 and the heat seal layer 3, or, although not shown, may be disposed on the surface of the first base material layer opposite the heat seal layer. When the first printed layer is disposed between the first base material layer and the heat seal layer, the first printed layer can be protected by the first base material layer, and it is possible to prevent information and patterns on the first printed layer from being lost due to rubbing or the like, and to prevent tampering with the information and patterns on the first printed layer. The first printed layer may include a colorant and a binder resin.

[0103] The colorant may be a pigment or a dye. One type of colorant may be used, or two or more types may be used. The content of the colorant in the first printed layer is, for example, 5% by mass or more and 70% by mass or less, or 15% by mass or more and 60% by mass or less, or 20% by mass or more and 60% by mass or less.

[0104] As the binder resin, a binder resin used in a general ink for film lamination can be used.

[0105] The first printing layer may contain any additives as needed, such as fillers, stabilizers, plasticizers, antioxidants, UV absorbers, light stabilizers, dispersants, thickeners, desiccants, lubricants, antistatic agents, and crosslinking agents.

[0106] The first printed layer can be formed by printing ink on one surface of the first base layer, for example, by gravure printing, flexographic printing, digital printing, offset printing, screen printing, or inkjet printing.

[0107] Ink typically contains a colorant, a binder resin, and a solvent. A solvent typically used in inks can be used. The solvents may be used alone or in combination.

[0108] The thickness of the first printed layer is not particularly limited, and may be, for example, 1 μm or more and 5 μm or less, or 1 μm or more and 3 μm or less.

[0109] 7.Second printing layer The laminate in this embodiment may have a second printed layer between the second base material layer and the heat seal layer, or between the second base material layer and the seal layer. By providing the second printed layer, when the laminate is used for packaging, labels, etc., information about the contents can be confirmed even after the first base material layer and the heat seal layer are peeled off from the laminate.

[0110] The second print layer is a layer on which information, pictures, etc. are printed. The information and pictures may be the same as the information and pictures printed on the first print layer.

[0111] The second printed layer may be disposed between the second substrate layer and the heat-sealing layer, or between the second substrate layer and the sealing layer. When the second printed layer is disposed between the second substrate layer and the heat-sealing layer, the second printed layer is disposed between the second substrate layer and the sealing layer, thereby preventing a decrease in the lamination strength between the second substrate layer and the sealing layer. On the other hand, when the second printed layer is disposed between the second substrate layer and the sealing layer, damage to the adherend can be prevented when the first substrate layer and the heat-sealing layer are peeled from the laminate.

[0112] When the second printing layer is arranged between the second base material layer and the sealing layer, and an adhesive layer is arranged between the second base material layer and the sealing layer, the second printing layer 7b is arranged between the second base material layer 4 and the adhesive layer 5, as shown in Figure 7(b), for example.

[0113] The material, thickness, and formation method of the second printed layer can be the same as those of the first printed layer.

[0114] The laminate in this embodiment may have, as the printed layer, only the first printed layer 7a, for example, as shown in Figure 7(a), or only the second printed layer 7b, for example, as shown in Figure 7(b), or may have both the first printed layer 7a and the second printed layer 7b, for example, as shown in Figure 7(c).

[0115] 8.First protective layer In this embodiment, when the first printing layer is arranged on the side of the first base layer opposite the heat seal layer, a first protective layer may be arranged on the side of the first printing layer opposite the first base layer.

[0116] The first protective layer is a member that protects the first printed layer. The presence of the first protective layer can prevent the information or image on the first printed layer from being lost due to rubbing or the like, and can also prevent the information or image on the first printed layer from being tampered with.

[0117] Examples of materials for the first protective layer include overprint varnish (OP varnish). The first protective layer may be formed, for example, by printing an OP varnish on the first printed layer.

[0118] 9.Second protective layer In this embodiment, when the second printing layer is arranged between the second base material layer and the heat seal layer, a second protective layer may be arranged between the second printing layer and the heat seal layer.

[0119] The second protective layer is a member that protects the second printed layer. The presence of the second protective layer can prevent information or patterns on the second printed layer from being lost due to rubbing or the like after the first base material layer and the heat seal layer are peeled off from the laminate, and can also prevent damage or peeling of the second printed layer, i.e., damage to the adherend, from occurring when the first base material layer and the heat seal layer are peeled off from the laminate.

[0120] Examples of materials for the second protective layer include overprint varnish (OP varnish). The second protective layer may be formed, for example, by printing an OP varnish on the second printed layer.

[0121] 10. Barrier layer 8(a) and 8(b), the laminate in this embodiment may have a barrier layer 8 at any position between the heat seal layer 3 and the seal layer 6. By providing the barrier layer, it is possible to impart barrier properties to the laminate.

[0122] Examples of materials for the barrier layer include metals, inorganic oxides, organic-inorganic composite materials, and organic materials.

[0123] Examples of metals include aluminum, magnesium, tin, sodium, titanium, lead, zirconium, yttrium, gold, chromium, and alloys thereof. Among these, when the laminate is used as a packaging material, aluminum or its alloys are preferably used. The metal-containing barrier layer may be, for example, a metal film such as a vapor-deposited film, or a metal foil.

[0124] Examples of inorganic oxides include aluminum oxide, magnesium oxide, calcium oxide, potassium oxide, tin oxide, sodium oxide, titanium oxide, lead oxide, zirconium oxide, yttrium oxide, silicon oxide, etc. Among these, when the laminate is used as a packaging material, aluminum oxide is preferably used.

[0125] Examples of organic materials include ethylene-vinyl alcohol copolymers and polyvinylidene chloride resins.

[0126] Examples of organic-inorganic composite materials include materials containing a condensate of a hydrolyzate of a metal alkoxide and a water-soluble resin. Examples of metal alkoxides include silicon alkoxide, zirconium alkoxide, titanium alkoxide, and aluminum alkoxide. Examples of water-soluble resins include polyvinyl alcohol resin and ethylene-vinyl alcohol copolymer. Such organic-inorganic composite materials can be formed by a sol-gel method.

[0127] The barrier layer may be located at any position between the heat-sealing layer and the sealing layer, such as between the heat-sealing layer and the second base material layer, or between the second base material layer and the sealing layer. When the barrier layer is located between the heat-sealing layer and the second base material layer and a second printed layer is located between the heat-sealing layer and the second base material layer, the barrier layer may be located between the heat-sealing layer and the second printed layer, or between the second printed layer and the second base material layer. When the barrier layer is located between the second base material layer and the sealing layer and a second printed layer is located between the second base material layer and the sealing layer, the barrier layer may be located between the second base material layer and the second printed layer, or between the second printed layer and the sealing layer.

[0128] When the barrier layer is disposed in contact with the sealing layer, the surface of the sealing layer on which the barrier layer is disposed may be subjected to a surface treatment, if necessary. Examples of the surface treatment include physical treatments such as corona discharge treatment, ozone treatment, low-temperature plasma treatment using oxygen gas, nitrogen gas, or the like, and glow discharge treatment, and chemical treatments such as oxidation treatment using chemicals, or the like.

[0129] In addition, when a barrier layer is disposed between the second base layer and the seal layer, an anchor layer may be disposed between the barrier layer and the seal layer to improve adhesion between the barrier layer and the seal layer.

[0130] The thickness of the barrier layer is appropriately selected depending on the material, etc. The thickness of the barrier layer is, for example, 5 nm or more and 200 nm or less, and may be 10 nm or more and 100 nm or less.

[0131] The method for forming the barrier layer is appropriately selected depending on the material of the barrier layer, and examples thereof include physical vapor deposition (PVD) methods such as vacuum deposition, sputtering, and ion plating, and chemical vapor deposition (CVD) methods such as plasma enhanced chemical vapor deposition, thermal chemical vapor deposition, and photochemical vapor deposition. The barrier layer may also be formed by applying the above-mentioned material onto the first substrate layer, second substrate layer, or sealing layer. When the barrier layer is, for example, a metal foil, examples of the method include disposing the barrier layer on the first substrate layer, second substrate layer, or sealing layer via an adhesive layer.

[0132] 11. Second Barrier Layer The laminate in this embodiment may have a second barrier layer between the first base material layer and the heat seal layer, or on the surface of the first base material layer opposite the heat seal layer. The second barrier layer may be the same as the barrier layer described above.

[0133] 12. Peel strength In the laminate of this embodiment, the peel strength when the first base layer and the second base layer are peeled off is, for example, preferably 0.1 N / 15 mm or more, and more preferably 0.5 N / 15 mm or more. Furthermore, the peel strength is, for example, preferably 3.5 N / 15 mm or less, more preferably 3.0 N / 15 mm or less, even more preferably 2.5 N / 15 mm or less, particularly preferably 2.0 N / 15 mm or less, and most preferably 1.5 N / 15 mm or less. Specifically, the peel strength is preferably 0.1 N / 15 mm or more to 3.5 N / 15 mm or less, more preferably 0.5 N / 15 mm or more to 3.5 N / 15 mm or less, even more preferably 0.5 N / 15 mm or more to 2.5 N / 15 mm or less, particularly preferably 0.5 N / 15 mm or more to 2.0 N / 15 mm or less, and most preferably 0.5 N / 15 mm or more to 1.5 N / 15 mm or less. When the peel strength is within the above range, the first base material layer and the heat seal layer can be easily peeled from the laminate.

[0134] Here, the peel strength when the first base material layer and the second base material layer of the laminate are peeled can be measured in accordance with JIS Z1707:1997, Section 7.4 (Heat Seal Strength Test). Specifically, first, ten 15 mm wide rectangular test pieces are cut out from the laminate with the MD direction as the longitudinal direction. Next, the first base material layer and the second base material layer of the ten test pieces are each gripped with the gripping tools of a tensile tester, opened 180°, and pulled at a pulling rate of 50 mm / min to perform a T-peel. The maximum force (N) is measured. The measurement conditions are a temperature of 25°C and a relative humidity of 50%. For example, a Tensilon STA-115 manufactured by A&D Corporation can be used as the tensile tester.

[0135] 13.Applications Examples of uses of the laminate according to the present disclosure include packaging, labels, and the like. When the laminate of the present disclosure is used in a package, the first base material layer and the heat seal layer can be peeled off from the laminate, and since the first base material layer and the second base material layer are made of different materials, it is possible to recycle either or both of the first base material layer and the second base material layer. A package using the laminate of the present disclosure will be described later.

[0136] Furthermore, when the laminate of the present disclosure is used for a label, the label can be adhered to, for example, a plastic bottle, a plastic cup, a metal can, a glass bottle, or the like.

[0137] II. Second embodiment The laminate in this embodiment has a base material layer, a patterned heat seal layer having easy peelability, and a seal layer, in this order, and is a laminate that does not include any other base material layer other than the base material layer, and is characterized in that the base material layer and the seal layer are made of different materials.

[0138] The laminate of this embodiment will be described with reference to the drawings. Figures 19(a) and 19(b) are a schematic plan view and a cross-sectional view showing an example of the laminate of this embodiment, where Figure 19(a) is a plan view of the laminate as seen from the base layer side, and Figure 19(b) is a cross-sectional view taken along line AA of Figure 19(a). As shown in Figures 19(a) and 19(b), the laminate 1 has a base layer 20, a patterned heat seal layer 3 having easy peelability, and a seal layer 6, in this order. The base layer 20 and the seal layer 6 are made of different materials. In the example shown in FIGS. 19(a) and 19(b), the heat seal layer 3 has a circular dot pattern.

[0139] Since the heat seal layer 3 has easy peelability, the base material layer 20 and the heat seal layer 3 can be peeled from the seal layer 6 .

[0140] In the laminate of this embodiment, a patterned heat seal layer having easy peelability is disposed between the base layer and the seal layer, so that the seal layer can be peeled from the base layer.

[0141] The base layer and the seal layer are made of different materials, and by making them easily peelable, for example, when used as a package, they can be easily separated after use, which improves environmental conservation, such as recyclability and ease of separate disposal. A second embodiment of the laminate of the present disclosure will be described in detail below.

[0142] 1. Heat seal layer The heat seal layer in this embodiment is the same as that in the first embodiment except that it is disposed between the substrate and the seal layer, and therefore a description thereof will be omitted here.

[0143] 2.Base material layer The base layer in this embodiment is a member that supports the heat seal layer and is made of a material different from that of the seal layer described below. Here, the definition of "different material" is the same as in the first embodiment.

[0144] The substrate layer may be made of a resin substrate, a paper substrate, or a metal foil, and the thickness of the substrate layer may be in the range of 6 μm to 150 μm. The material constituting the base layer is different from that of the sealing layer described below. As a combination of materials for the base layer and the sealing layer, a combination of paper and polyolefin resin is preferred from the viewpoint of recyclability, and in particular, a combination of paper and unstretched polypropylene, or paper and unstretched linear low-density polyethylene is preferred because both are recyclable when separated and disposed of.

[0145] The base material layer in this embodiment is similar to the first base material layer in the first embodiment except for the above, and therefore a description thereof will be omitted here.

[0146] 3.Sealing layer The sealing layer in this embodiment is a member located on the outermost surface of the laminate opposite to the base layer, and serves as the innermost layer when a package is produced using the laminate. In this embodiment, the material constituting the sealing layer is different from the material constituting the base material layer, where "different material" has the same meaning as defined in the first embodiment.

[0147] The sealing layer in this embodiment is the same as that in the first embodiment except for the points mentioned above, and therefore a description thereof will be omitted here.

[0148] 4.First printing layer The laminate in this embodiment may have a first printed layer between the base layer and the heat seal layer, or on the surface of the base layer opposite to the heat seal layer. By disposing the first printed layer, for example, when a package is formed using the laminate of this embodiment, the design of the package can be improved.

[0149] The first printed layer is a layer on which information, pictures, etc. are printed. When the laminate is used for packaging, labels, etc., information printed on the first printed layer may include, for example, a diagram of the contents, the product name of the contents, a manufacturing number, ingredient labeling, identification labeling, a barcode, etc. When the laminate is used for packaging, labels, etc. for food, information such as the expiration date of the contents and the date of manufacture may also be included. Furthermore, examples of pictures printed on the first printed layer include figures, patterns, letters, symbols, designs, marks, etc.

[0150] When the laminate in this embodiment has a second printed layer (described later) in addition to the first printed layer, it is preferable that the information, design, etc. printed on the first printed layer be different from the information, design, etc. printed on the second printed layer, as this can improve the design. Other aspects of the first printed layer are the same as those of the first embodiment, and therefore will not be described here.

[0151] 5.Second printing layer The laminate in this embodiment may have a second printed layer between the seal layer and the heat seal layer. By disposing the second printed layer, when the laminate is used for packaging, labels, etc., the design can be further improved. Other aspects of the second printed layer are the same as those of the first printed layer, and therefore will not be described here.

[0152] 6.First protective layer In this embodiment, when the first printing layer is arranged on the side of the base layer opposite the heat seal layer, a first protective layer may be arranged on the side of the first printing layer opposite the base layer. Other than the above, the first protective layer in this embodiment is the same as that described in the first embodiment.

[0153] 7.Second protective layer In this embodiment, when the second printed layer is arranged between the seal layer and the heat seal layer, a second protective layer may be arranged between the second printed layer and the heat seal layer.

[0154] Other than the above, the second protective layer in this embodiment is the same as that described in the first embodiment.

[0155] 8. Barrier layer The laminate in this embodiment may have a barrier layer at any position except for the surface of the sealing layer opposite to the base layer. By providing the barrier layer, when the laminate is used as a package, it is possible to prevent the intrusion of gases such as oxygen and water vapor into the inside, and to prevent deterioration of the items stored inside.

[0156] The material constituting the barrier layer in this embodiment is the same as that in the first embodiment described above, and therefore a description thereof will be omitted here.

[0157] The location of the barrier layer in this embodiment may be any location on the side of the base layer opposite the heat seal layer, between the base layer and the heat seal layer, or between the heat seal layer and the seal layer.

[0158] Other aspects of the barrier layer are the same as those of the barrier layer and second barrier layer described in the first embodiment, and therefore description thereof will be omitted here.

[0159] 9. Peel strength and applications The peel strength in the present disclosure is the same as that described in the first embodiment above, except that it is the peel strength when peeled between the base material layer and the sealing layer, so the explanation here will be omitted. Furthermore, the use is the same as that of the first embodiment except that the purpose of use is to improve the recyclability and ease of sorting and disposal of the base layer and sealing layer, so a description thereof will be omitted here.

[0160] B. Packaging The packaging body in the present disclosure has the above-described laminate.

[0161] 9(a) and 9(b) are a schematic plan view and a cross-sectional view showing an example of a package using the first embodiment of the laminate described above, and FIG. 9(b) is a cross-sectional view taken along line BB in FIG. 9(a). As shown in FIGS. 9(a) and 9(b), in the package 10, two laminates 1 are arranged with their seal layers 6 facing each other, and have a seal portion 11 at their peripheries where the seal layers 6 of the laminates 1 are bonded together. The structure of the laminate 1 can be the same as the structure of the laminate 1 illustrated in FIG. 1 above. In addition, in FIGS. 9(a) and 9(b), the package 10 is a four-sided sealed bag and can have a cutout portion 12.

[0162] The heat seal layer 3 of the laminate 1 constituting the package 10 is easily peelable, and therefore, as shown in Figures 10(a) and 10(b), the first base material layer 2 and the heat seal layer 3 can be peeled from the laminate 1. Note that Figure 10(a) is a plan view of the laminate constituting the package when the first base material layer and part of the heat seal layer have been peeled off, and Figure 10(b) is a cross-sectional view of the laminate constituting the package when the first base material layer and the heat seal layer have all been peeled off.

[0163] 20(a) and 20(b) are a schematic plan view and a cross-sectional view showing an example of a package using the second embodiment of the laminate described above, and FIG. 20(b) is a cross-sectional view taken along line BB in FIG. 20(a). As shown in FIGS. 20(a) and 20(b), in the package 10, two laminates 1 are arranged with their seal layers 6 facing each other, and have a seal portion 11 at their peripheries where the seal layers 6 of the laminates 1 are bonded together. The structure of the laminate 1 can be similar to that of the laminate 1 illustrated in FIG. 19 above. In addition, in FIGS. 20(a) and 20(b), the package 10 is a four-sided sealed bag and can have a cutout portion 12.

[0164] The heat seal layer 3 of the laminate 1 constituting the packaging body 10 is easily peelable, and therefore, as shown in Figures 21(a) and 21(b), the base material layer 20 and the heat seal layer 3 can be peeled from the laminate 1. Note that Figure 21(a) is a plan view of the laminate constituting the packaging body when the base material layer and part of the heat seal layer have been peeled off, and Figure 21(b) is a cross-sectional view of the laminate constituting the packaging body when the base material layer and the heat seal layer have all been peeled off.

[0165] In the present disclosure, when the laminate constituting the packaging body is the laminate of the first embodiment, a patterned heat seal layer having easy peelability is disposed between the first base material layer and the second base material layer, and the first base material layer and the second base material layer are made of different materials. Therefore, by peeling the first base material layer and the heat seal layer from the laminate, the first base material layer and the second base material layer can be separated. This improves environmental conservation, such as recyclability and ease of separate disposal.

[0166] In addition, in the present disclosure, when the laminate constituting the packaging body is the laminate of the second embodiment, a patterned heat seal layer having easy peelability is disposed between the base layer and the seal layer, and the base layer and the seal layer are made of different materials. Therefore, the base layer and the heat seal layer can be separated by peeling them from the laminate. This improves environmental conservation, such as recyclability and ease of separate disposal, as in the case of the first embodiment.

[0167] The configuration of the packaging body in the present disclosure will be described below. The package may have a seal portion at the periphery where the seal layers of the laminate are bonded to each other or where the seal layer of the laminate is bonded to another layer. The position of the seal portion is appropriately selected depending on the shape of the package, the bag-making method, etc.

[0168] The form of the packaging body is not particularly limited, and examples include two-sided sealed bags, three-sided sealed bags, four-sided sealed bags, pillow bags (palm-sealed bags, envelope-sealed bags), stick bags, gusset bags, stand-up bags, zip-top bags, laminated tubes, and lids.

[0169] Examples of bag manufacturing methods include stacking two laminates with their sealing layers facing each other and sealing the edges, folding one laminate with the sealing layer facing inward and sealing the edges, and sealing a laminate to create a cylindrical body and then sealing the cylindrical body to a base material made of another laminate or other material.

[0170] The sealing method is appropriately selected depending on the type of sealing layer. In the case of a heat-seal type sealing layer or a hot-melt type sealing layer, examples of the sealing method include heat sealing such as hot plate sealing, band sealing, impulse sealing, high-frequency sealing, and ultrasonic sealing. In the case of a cold seal type sealing layer, the sealing method may be a method of applying pressure at room temperature.

[0171] In the case of a heat-seal type seal layer or a hot-melt type seal layer, heat is also applied to the heat-seal layer of the laminate during sealing, but this heating does not usually increase the adhesive strength of the heat-seal layer.

[0172] The laminate constituting the packaging body has been described in detail above in "A. Laminate," so a detailed description thereof will be omitted here.

[0173] As described above, the heat seal layer of the laminate may be arranged in a pattern on one side of the first base material layer (when the laminate is the second embodiment, it is the base material layer; hereinafter, this description format has the same meaning), and may be arranged in a pattern overall on one side of the first base material layer (base material layer), or may be arranged in a pattern locally.

[0174] In particular, as described above, it is preferable that the heat seal layer be arranged in a pattern over the entire surface of one surface of the first base material layer (base material layer).

[0175] Furthermore, when the heat seal layer is locally arranged in a pattern on one surface of the first base layer (base layer), it is preferably arranged on the periphery of the first base layer (base layer) as described above. In this case, when the shape of the laminate in plan view is rectangular, the heat seal layer is preferably arranged on the periphery of three or four sides of the first base layer (base layer), for example, and more preferably arranged on the periphery of four sides of the first base layer.

[0176] Furthermore, when the heat seal layer is locally arranged in a pattern on one surface of the first base material layer (base material layer), it is preferable that the heat seal layer is arranged continuously, as described above.

[0177] Furthermore, when the heat seal layer is locally arranged in a pattern on one surface of the first base layer (base layer), the heat seal layer is preferably arranged in the seal section where the seal layers of the laminate are bonded together. By arranging the heat seal layer in the seal section and not in areas other than the seal section, the heat seal layer can be made less noticeable.

[0178] 11(a) and (b), for example, the heat seal layer 3 is continuously disposed on the peripheral edge portions of the four sides of the first base material layer 2. The heat seal layer 3 is also disposed in the sealed portion 11. Note that FIG. 11(b) is a cross-sectional view taken along line BB in FIG. 11(a).

[0179] The laminate constituting the package can have a tab portion on one side of the first base material layer (base material layer) where no heat seal layer is arranged. By having the tab portion, the first base material layer (base material layer) and the heat seal layer can be easily peeled off by grasping the tab portion when peeling them off from the laminate.

[0180] The tab portion is a region on one side of the first base material layer (base material layer) where no heat seal layer is disposed. The position of the tab portion is appropriately selected depending on the shape of the package, etc. If the tab portion is disposed in, for example, the seal portion, the seal portion becomes thicker and stiffer, making it easier to peel.

[0181] For example, when the package is a pillow bag, the tab 13 can be located in a portion of the seal. Specifically, as shown in Figures 12(a) and (b), the tab 13 can be located near the overlapping area of ​​the upper seal 11a and the seam seal 11c, and near the overlapping area of ​​the lower seal 11b and the seam seal 11c. Alternatively, as shown in Figures 13(a) and (b), the tab 13 can be located over the entire upper seal 11a and the entire lower seal 11b. Alternatively, as shown in Figures 14(a) and (b), the tab 13 can be located near the center of the seam seal 11c. Note that Figures 12(a), 13(a), and 14(a) are plan views of the pillow bag from the side opposite the seam seal, while Figures 12(b), 13(b), and 14(b) are plan views of the pillow bag from the side facing the seam seal.

[0182] Furthermore, for example, if the package is a four-sided sealed bag, the tabs may be located on the periphery of the package, or if the package has a tear line at the top, they may be located near the tear line. Specifically, as shown in Figures 15(a), (b), and (c), the tabs 13 may be located at the corners of the package 10. In this case, the tabs 13 may be located only in the sealed portion 11 as shown in Figure 15(a), or may be located not only in the sealed portion 11 but also in areas other than the sealed portion 11 as shown in Figure 15(b). In this case, the tabs 13 may be located at one corner of the package 10 as shown in Figures 15(a) and (b), or may be located at two corners of the package 10 as shown in Figure 15(c). Furthermore, if the package 10 has a tear line 15, the tabs 13 may be located near the tear line 15 as shown in Figure 15(d). In this case, the wrapping body 10 can be cut along the cut line 15, allowing the grip portion 13 to be grasped. In FIG.

[0183] Furthermore, for example, if the packaging body is a four-sided sealed bag, and a heat seal layer is arranged around the three edges of the first base material layer (base material layer), the first base material layer (base material layer) and the heat seal layer can be easily peeled off from the laminate by grasping one edge of the first base material layer (base material layer) on which the heat seal layer is not arranged.

[0184] Furthermore, for example, when the package is a stand-up bag (stand-up pouch), the tabs 13 can be located at the upper or side edges of the package. Specifically, the tabs 13 can be located at corners of the upper edge of the package 10 as shown in FIGS. 16(a) and 16(b), or at corners and side edges of the upper edge as shown in FIG. 16(c). In this case, although not shown, the tabs can be located only in the sealed area, or can be located in areas other than the sealed area as well as the sealed area. In this case, the tabs 13 can be located at one corner of the upper edge of the package 10 as shown in FIG. 16(a), or at two corners of the upper edge of the package 10 as shown in FIG. 16(b).

[0185] Furthermore, for example, when the packaging body is a stand-up bag (stand-up pouch), if the heat seal layer 3 is arranged on the peripheral portions of three sides of the first base material layer 2 (base material layer 20) as shown in Figure 17, the first base material layer 2 and the heat seal layer 3 can be easily peeled off from the laminate 1 by grasping one side of the first base material layer 2 (base material layer 20) on which the heat seal layer 3 is not arranged.

[0186] The packaging may have, for example, at least one of a cutout, a tear line, a zipper, a spout, and the like.

[0187] For example, when the package is a stand-up bag (stand-up pouch), as shown in FIG. 18, a part of the seal portion 11 may be a modified seal portion 11d that serves as a spout.

[0188] The contents filled into the package are not particularly limited, and examples thereof include food, toiletries, cosmetics, pharmaceuticals, quasi-drugs, etc. The forms of the contents include, for example, solids, liquids, pastes, powders, granules, tablets, capsules, etc.

[0189] The package may be one in which the contents are filled inside, or one in which the contents have not yet been filled inside.

[0190] Among these, a package that can be stored as is for a certain period of time after the package filled with the contents is obtained, or can be used as is is preferred.

[0191] The present disclosure is not limited to the above-described embodiments. The above-described embodiments are merely examples, and any configuration that is substantially identical to the technical idea described in the claims of the present disclosure and that provides similar effects is included within the technical scope of the present disclosure. [Example]

[0192] The present disclosure will now be further described with reference to examples.

[0193] [Example 1] A 12 μm thick polyethylene terephthalate (PET) film (E5102 manufactured by Toyobo) was prepared as the base layer, and a 30 μm thick unstretched polypropylene film (CPP, manufactured by Mitsui Chemicals Tocello, Inc., GLC) was prepared as the sealing layer (heat seal type).

[0194] First, a first printed layer was formed on the base layer. Next, a heat sealing agent was applied to the first printed layer in an amount of 1.1 g / m. 2 The dots were circular, with a diameter of 5 mm and a pitch of 10 mm.

[0195] Next, the heat seal layer was thermally laminated onto the surface of the seal layer, and the surface of the first base layer on the side of the first printed layer was bonded to the seal layer via the heat seal layer, thereby obtaining a laminate (second embodiment).

[0196] [Example 2] Heat sealant applied at a coating weight of 3.0 g / m 2 A laminate (second embodiment) was obtained in the same manner as in Example 1, except that:

[0197] [Example 3] Base layer: 50g / m 2 The paper material (Kinshachi, manufactured by Daio Paper Co., Ltd.) and a 40 μm aluminum-deposited unstretched polypropylene film (2703, manufactured by Toray Film Processing Co., Ltd.) were prepared as a sealing layer with a barrier layer.

[0198] First, a first printed layer was formed on the base layer. Next, a heat sealing agent was applied to the surface of the base layer opposite to the first printed layer in an amount of 1.1 g / m. 2 The dots were circular, with a diameter of 5 mm and a pitch of 10 mm, to form a heat seal layer.

[0199] Next, the heat seal layer was thermally laminated onto the barrier layer side of the barrier layer-attached seal layer, so that the surface of the base layer opposite to the first printed layer and the barrier layer side of the barrier layer-attached seal layer were bonded via the heat seal layer, thereby obtaining a laminate (second embodiment).

[0200] [Example 4] Heat sealant applied at a coating weight of 3.0 g / m 2 A laminate (second embodiment) was obtained in the same manner as in Example 1, except that

[0201] [Example 5] The same paper material as in Example 3 was prepared as the first base layer. In addition, a 12 μm thick aluminum-deposited PET film (1310, manufactured by Toray Advanced Film Co., Ltd.) was prepared as the second base layer with a barrier layer. Furthermore, a 100 μm thick polyethylene film (LLDPE, HR-543, manufactured by Sky Film Co., Ltd.) was prepared as the seal layer (heat seal type).

[0202] First, the first printed layer was formed on the first base layer. Next, a heat sealing agent was applied to the surface of the first base layer opposite to the first printed layer in an amount of 1.1 g / m. 2 The dots were circular, with a diameter of 5 mm and a pitch of 10 mm, to form a heat seal layer.

[0203] Next, the heat seal layer was thermally laminated onto the surface of the second substrate layer of the second substrate layer with a barrier layer, thereby bonding the surface of the first substrate layer opposite the first printing layer to the surface of the second substrate layer with a barrier layer via the heat seal layer. Furthermore, a heat-sealable seal layer was dry-laminated via an adhesive onto the surface of the barrier layer-side second base layer with the barrier layer, thereby obtaining a laminate (first embodiment).

[0204] [Example 6] Heat sealant applied at a coating weight of 3.0 g / m 2 A laminate (first embodiment) was obtained in the same manner as in Example 5, except that

[0205] [Comparative Example 1] Heat sealant was applied to the entire surface at a coating weight of 4.0 g / m 2 A laminate was produced in the same manner as in Example 1, except that:

[0206] [evaluation] The laminate was measured for peel strength between the first and second base layers in the laminate of the first embodiment, and between the base layer and seal layer in the laminate of the second embodiment, in accordance with JIS Z1707:1997, Section 7.4 (Heat Seal Strength Test). Specifically, ten 15 mm-wide strip-shaped test pieces were cut from the laminate, with the MD direction as the longitudinal direction. The first and second base layers (base layer and seal layer) of the ten test pieces were then gripped with the gripping tools of a tensile tester, opened 180°, and pulled at a pulling rate of 50 mm / min to measure the maximum force (N) during T-peel. The measurement was performed in an environment of 25°C and 50% relative humidity. A Tensilon STA-115 tensile tester manufactured by A&D Corporation was used.

[0207] In addition, in the laminate, sensory evaluation was performed to determine the peelability when peeling between the first base material layer and the second base material layer in the first embodiment, and between the base material layer and the seal layer in the second embodiment, and the evaluation was based on the following criteria. A: The peeling sensation is good. B: Peel resistance is high but peeling is possible. C: Peel resistance is high and peeling is difficult.

[0208] [Table 1] [Explanation of symbols]

[0209] 1 ... Laminate 2...First base material layer 3... Heat seal layer 4...Second base material layer 5 … Adhesive layer 6...Sealing layer 10 … Packaging 20 … Substrate layer

Claims

1. A laminate having a base material layer, a patterned heat seal layer having easy peelability, and a seal layer in this order, and not including any other base material layer other than the base material layer, The laminate, wherein the base layer and the seal layer are made of different materials.

2. The laminate according to claim 1, wherein the peel strength when the base layer and the seal layer are peeled off is 0.1 N / 15 mm or more and 3.5 N / 15 mm or less.

3. The laminate according to claim 1 or 2, further comprising a first printed layer between the base layer and the heat seal layer, or on the surface of the base layer opposite to the heat seal layer.

4. A package comprising the laminate according to any one of claims 1 to 3.

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