JP5594761B2 - Laminates and packages - Google Patents

Description

  The present invention relates to a laminate and a package that are excellent in barcode reading accuracy.

  Conventionally, barcodes are printed on a large number of articles, and are used for cash calculation and inventory adjustment at a cash register (settlement place) such as a supermarket or a convenience store. Barcodes are tasteless and dry designs that are meaningless for consumers, and product manufacturers must sacrifice space for advertisements and promotions, and it is desirable to reduce the barcode printing area. Yes. In addition, for the purposes of expiration date management, misuse prevention, and inventory management, it is also required to print barcodes on individual packages or in dosage units or dispensing packaging units on pharmaceuticals such as capsules and tablets. In view of these requirements, the present inventors have previously developed a packaging sheet having excellent barcode reading accuracy (Patent Document 1). According to the invention of this packaging sheet, it is proposed that a white colored layer is interposed between the aluminum foil and the barcode part, thereby improving the reading accuracy of the barcode, and further between the aluminum foil and the white colored layer. It has been proposed that the reading accuracy of the barcode is further improved by interposing a transparent or translucent underlayer on the surface.

JP 2008-174302 A

  However, in the above prior art, although the barcode reading accuracy is improved, it is necessary to interpose a white colored layer between the aluminum foil and the barcode portion, and the color tone of the packaging sheet is limited to white. It is not possible to respond to customer requests for coloring. Further, even if a device for improving the reading accuracy of the barcode is applied, it does not lead to improvement of convenience for the user depending on the manufacturing method of the packaging sheet.

  SUMMARY OF THE INVENTION In view of the problems of the prior art, the present invention is a packaging body that can ensure high reading accuracy in a customer and meets the demands of various customers and is not affected by the manufacturing method of the packaging sheet, etc., and a laminate used therefor The main purpose is to provide In this specification, “reading accuracy” means that barcode information (such as a barcode reader) is smoothly read as electronic information without erroneous reading and reading failure. Also called “scanning accuracy”.

The laminate of the present invention comprises a base material layer including a metal thin film layer, a barcode printing layer located on at least a part of the base material layer, and an overcoat layer located so as to cover the barcode printing layer, the overcoat layer is comprised of beads dispersed in the matrix resin and the matrix resin, the beads are, (1) glass Subi over's, and, (2) acrylic resins, urethane resins, melamine resins, amino resins, Epoxy resin, polyethylene resin, polystyrene resin, polypropylene resin, polyester resin, cellulose resin, vinyl chloride resin, polyvinyl alcohol, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, ethylene-acrylic At least selected from an ethyl acid copolymer, polyacrylonitrile, polyamide Includes species of the resin beads, both, the beads have an average particle diameter of 0.01Myuemu～30myuemu, the total content of the overcoat layer is Ri 1 to 40 wt% der a solids basis, and (1 The average particle size of the beads of (2) is larger than the average particle size of the resin beads of (2) . (1) hard beads are glass Subi over's, and (2) soft beads are beads formed by a general resin (resin other than engineering plastic).
According to this configuration, the following operational effects can be obtained.
1. The barcode reading accuracy can be improved while the layer structure is smaller than that of the conventional known technique (for example, thermal adhesive layer / aluminum foil / barcode printing layer / bead-containing overcoat layer).
2. Even when applied to a conventional layer structure (for example, thermal adhesive layer / aluminum foil / white colored layer / barcode printed layer / bead-containing overcoat layer), the barcode reading accuracy is further improved. The barcode printing unit can be reduced.
3. (2) When only soft beads, for example, only resin beads formed of general resin are included, the resin beads may be deformed (collapsed) depending on the heat sealing conditions to improve the barcode reading accuracy. I can't. As described above, by including both (1) hard beads and (2) soft beads, deformation of the beads can be almost prevented even when heat sealing at high temperature and high pressure is applied. It is possible to prevent a decrease in reading accuracy due to the above.
4). In the conventionally known configuration, the white colored layer is indispensable. However, in the present invention, it is no longer essential. Therefore, within the range that does not impair the effect of the present invention (within the range in which the barcode can be read), Laminates and packages can be provided with various color configurations.
5. As long as the effect of the present invention is not impaired (within a bar code readable range), the overcoat layer can be colored in the same manner as in the past.
6). The process can be simplified from the conventionally known configuration, leading to process shortening and cost reduction.
7). Since the barcode reading accuracy (scanning accuracy) is improved over the conventionally known configuration, reading defects can be reduced.

  The base material layer includes a metal thin film layer. Thereby, the strength of the base material layer can be improved. At this time, the metal thin film layer may constitute the base material layer itself (the whole), or the base material layer may be a composite layer and one or more of the layers may be a metal thin film layer.

The total content of (1) hard beads and (2) soft beads in the overcoat layer is 1 wt% to 40 wt% based on the solid content. The adhesion amount of the overcoat layer after drying weight may be ^{0.3g / m 2 ~10g / m 2} . Thereby, even when a white colored layer or the like is not used, the barcode reading accuracy can be reliably improved.

  The overcoat layer can further include one or more color pigments and / or the substrate layer can include a color layer. As a result, it is possible to meet various requirements of customers, in particular, the designation of coloring. In addition, that a base material layer contains a colored layer means the form by which the colored layer like a white colored layer is provided on the base material layer, for example. At this time, the base material layer becomes (base material layer body / colored layer), but the base material layer body is also referred to as a base material layer, and the term base material layer body is not used. Therefore, for example, a colored layer is provided on the base material layer.

  The base material layer can include a thermal adhesive layer. As a result, the laminated body for the lid of the press-through pack including the pocket for the medicine can be easily heat-bonded to the flange portion adjacent to the pocket and other sheets. At this time, the base material layer is (thermoadhesive layer / base material layer main body), but the base material layer main body is also referred to as a base material layer, and the term base material layer main body is not used. Therefore, for example, a thermal adhesive layer is provided on the back surface of the base material layer.

  The (1) hard beads and (2) soft beads can be transparent. Thereby, the reading accuracy of the barcode part can be further improved.

  The average particle diameter of the (1) hard beads and (2) soft beads is set to 0.01 μm to 30 μm. Accordingly, when used for a cover of a press-through pack or the like, it is possible to prevent inconveniences such as being too large and not falling off the overcoat layer, and being too small and not effective in improving the barcode reading accuracy.

  The overcoat layer can further contain one or more color pigments. Accordingly, it is possible to meet various customer requirements, particularly the designation of requirements added to the effect of the colored layer.

(1) the beads of hard and glass beads, (2) beads soft resin beads. This makes it possible to (1) hard and (2) transparent or translucent materials for both hard and soft beads while preventing deformation (smashing) of soft beads during heat sealing with hard glass beads. By using it, the reading accuracy of the barcode can be improved.

(1) Hard beads can be used as glass beads, (2) soft beads can be used as resin beads, and metal oxide particles can be added to the overcoat layer to improve the wear resistance of the overcoat layer. . As the metal oxide particles, at least one selected from the group consisting of silicon oxide (silica), titanium oxide, calcium oxide, talc (a mixture of metal oxides), barium oxide, aluminum oxide and the like can be adopted. Among these, silicon oxide (silica) is particularly preferable from the viewpoint of wear resistance. The addition amount of the metal oxide particles is preferably 3 to 15% by weight (based on the solid content) of the overcoat layer, and more preferably 5 to 10% by weight. The average particle diameter of the metal oxide particles is preferably 0.1 to 5 μm. If the average particle size is too large, the wear resistance may not be sufficiently improved, and if the average particle size is too small, uniform dispersion becomes difficult, and the wear resistance may not be sufficiently improved. The relationship of the average particle diameter (D) with each bead when metal oxide particles are added preferably satisfies the following formula from the viewpoints of wear resistance, pressure resistance, and durability.
(2) Average particle size D of soft resin beads D ≦ average particle size D of metal oxide particles <average particle size D of glass beads D (1)

  When the laminate is heat-sealed to the peripheral edge of the opening of the container as a lid material sheet of the container, (1) the hard beads can have a hardness that does not deform due to the pressure during heat-sealing. Thereby, (1) Hard beads can play a role of preventing collapse in the overcoat layer against the pressure during heat sealing.

(1) the average particle diameter of the hard beads that be greater than the average particle diameter of the beads (2) soft. Thereby, (2) the deformation of the soft beads can be surely prevented.

  The package of the present invention includes any one of the above-described laminates. As a result, a package having excellent barcode reading accuracy can be obtained.

  ADVANTAGE OF THE INVENTION According to this invention, the laminated body which can improve the reading precision of barcode with a layer structure less than a conventionally well-known layer structure, and a package body using the same can be obtained. Furthermore, even when applied to a conventional layer configuration, the barcode reading accuracy is further improved, and the barcode printing unit can be further reduced in size and area. Furthermore, even when high-temperature and high-pressure heat sealing is performed, it is possible to provide a package that can prevent the beads from being deformed and can prevent a reduction in barcode reading accuracy at a practical level.

It is sectional drawing of the laminated body in embodiment of this invention. It is sectional drawing of the laminated body in another embodiment of this invention.

  The base material layer used in the present invention is not particularly limited as long as the barcode can be read. For example, a simple substance selected from paper, synthetic paper, resin film, colored resin film, and metal thin film, or a composite of two or more kinds Can be used, and various colored layers, thermal adhesive layers, and the like, which will be described later, may be laminated and used. The base material layer preferably includes a metal thin film layer (or may be a metal thin film layer itself). As the metal thin film layer, an aluminum foil, a copper foil, a gold foil, a silver foil, an aluminum vapor deposition layer, or the like can be employed. Among these, aluminum foil is particularly preferable. The aluminum foil is not particularly limited as long as it is a known aluminum foil (including an aluminum alloy foil; the same shall apply hereinafter). For example, an aluminum foil having a thickness of 5 to 200 μm, preferably 12 to 50 μm, such as 1N30, 1070, 1100, 3003, 8021, and 8079 as defined by JIS can be used. Any of hard foil and semi-hard foil can be used depending on the application and required characteristics. In the case of an aluminum vapor deposition layer, an aluminum vapor deposition layer having a thickness of about 200 to 1000 angstroms can be employed.

The base material layer of the present invention is not particularly limited as long as the barcode provided thereon can be read, and a white colored layer is laminated on the aluminum foil as the base material layer as in the prior art (see FIG. 1). , A laminate of aluminum foil with a thermal adhesive layer (see FIG. 2), a transparent or semi-transparent underlayer interposed between the aluminum foil and the white colored layer, a printed layer other than a barcode or a solid colored layer It is possible to adopt a laminate of these. FIG. 1 shows a laminate including a white colored layer 3, which is provided with a white colored layer 3 on a base material layer (aluminum foil) 1 provided with a thermal adhesive layer 17 on the back surface, and a barcode printing section thereon. 5 (also referred to as a barcode printing layer) is formed, and an overcoat layer 7 is provided so as to cover the barcode printing portion 5. The overcoat layer 7 includes a resin 7a and the above-described (1) hard beads 7b and (2) soft beads 7c dispersed in the resin. (1) hard beads 7b is thus formed on the glass, (2) soft beads 7c is formed by a general resin (resin other than engineering plastic). In FIG. 2, the barcode printing unit 5 is formed on the base material layer (aluminum foil) 1 on which the thermal bonding layer 17 is disposed on the back surface, and the resin 7 a and the above-described resin are covered with the barcode printing unit 5. The overcoat layer 7 including (1) hard beads 7b and (2) soft beads 7c is disposed. In FIG. 2, no white colored layer is provided. In addition, the said heat adhesive layer can also be replaced with well-known adhesives / adhesives, such as an adhesion layer, a pressure sensitive adhesive layer, and a heat sensitive adhesive layer according to a use.

Case of laminating the white colored layer 3 on the aluminum foil 1 is the base layer is about 1.0g ^{/ m 2} ~4.0g ^/ m 2 on a solids weight per unit area is preferred. The white pigment used in the white colored layer 3 is preferably titanium dioxide, and is preferably contained in the white colored layer 3 in an amount of 20 to 30% by weight. However, the present invention is not limited to this, and other pigments such as phthalocyanine blue, phthalocyanine green, quinacridone-based, quinophthalene-based, within a range that does not impair the effects of the present invention (within a range in which barcodes can be read). Perylene-based, dioxazine-based, isoindolinone-based, iron oxide, mica, and their color chip pigments may be used in combination, or may be laminated as a single solid colored layer. Moreover, the lamination | stacking position may be the single side | surface or both surfaces of aluminum foil. The resin component and solvent used for the white colored layer, the solid colored layer, and the printing layer other than the barcode can use known ones, for example, resin components such as modified olefin resins, petroleum hydrocarbon resins, nitrocellulose, butyral, etc. And aromatic hydrocarbons such as toluene, alicyclic hydrocarbons such as methylcyclohexane, esters such as ethyl acetate, ketones such as methyl ethyl ketone, alcohol solvents such as isopropyl alcohol and denatured alcohol, and mixed solvents thereof. Can be used.

  The application method of a printing layer or a coloring layer is not specifically limited, It can apply | coat (laminate) by methods, such as a gravure roll coater, offset printing, flexographic printing, UV printing, and a curtain flow coater.

  When a base layer is provided between the base material layer (aluminum foil) 1 and the colored layer 3, the base layer is a transparent or translucent resin such as nitrocellulose, acrylic, epoxy, vinyl chloride, or polypropylene. Can be provided with a thickness of about 0.3 to 0.5 μm. Of course, when applying (lamination), a known method such as a gravure roll coater can be employed using an appropriate solvent.

When the thermal adhesive layer 17 is provided on the base material layer 1, a known thermal adhesive layer 17 is usually provided on the surface opposite to the side on which the barcode printing layer of aluminum foil is provided. For example, a thermobonding layer of vinyl chloride, polypropylene, polyolefin, polyester, vinyl chloride-vinyl acetate-maleic acid copolymer, ethylene-vinyl acetate copolymer, etc. is about 1 to 50 μm in thickness by a known method. Or it can provide by about 1-30 g / m < ² > by weight after drying.

  In a plan view, a predetermined barcode printing layer 5 (on the colored layer 3 in the case shown in FIG. 1 or directly on the base layer 1 in the case shown in FIG. A bar code printing section). In the present invention, the barcode is colored and may be any of red, green, blue, etc. as well as black. The barcode printing layer 5 can be provided by a known method using a known colored printing ink, such as carbon black, phthalocyanine blue, phthalocyanine green, quinacridone, quinophthalene, perylene, dioxazine, isoindolinone. A printing ink containing an iron oxide or the like as a colorant (pigment) can be printed by a gravure printing method, a flexographic printing method, or the like. As long as the barcode can be read, it may be other than black printing with carbon black. The barcode printing layer 5 is usually formed with a thickness of 0.5 μm to 2.0 μm after drying, and the pigment content is usually about 10 to 40% by weight (preferably 15 to 40% by weight) in the ink layer based on the solid content. ). Examples of the binder resin contained in the printing ink include vinyl acetate resin, vinyl chloride resin, vinyl acetate-vinyl chloride copolymer resin, polyurethane resin, and nitrocellulose. The design and size of barcode printing may be appropriately adjusted according to customer requirements. For example, it may be a one-dimensional barcode or a two-dimensional barcode or a matrix or composite QR code (registered trademark). There may be.

In the present invention, an overcoat layer (also referred to as an overprint (OP) layer) 7 is provided so as to cover the barcode print layer 5 (in this specification, “cover” means that the entire surface of the print layer 5 is covered) It is necessary to cover the overcoat layer 7 so that one side of the printing layer 5 is not exposed). The overcoat layer 7 contains both ( 1) hard beads and (2) soft beads. (1) Hard beads 7b and (2) soft beads 7c are preferably composed of transparent or translucent particles. (1) a hard bead glass, (2) soft beads, as long as it is formed of a material selected tree butter or colleagues, particularly limited not Na. Good Mashiku includes beads made of glass beads (1) hard, made of resin beads (2) sets Awa SEGA good beads soft. The blend ratio of (1) hard beads and (2) soft beads is (1) hard beads: (2) soft beads = 10: 90 to 90:10 (parts by weight) on a weight basis. Is preferred. In the present invention, (1) a hard bead has a hardness that does not deform (do not collapse) due to the pressure during heat sealing when the laminate of the present invention is heat-sealed to the peripheral edge of the opening of the container. The thing is called (1) hard bead, and (1) the bead having lower hardness than the hard bead is called (2) soft bead. As the material, a (1) hard beads are beads are thus formed on the glass, and (2) soft beads are beads that are generally formed by a resin except for engineering plastics. More specifically, (2) a soft bead has a hardness that is deformed by pressure during heat sealing. Wherein (1) the average particle diameter of the beads of hard, the (2) greater than the average particle diameter of the soft beads Kusuru. (1) By making the average particle size of the hard beads larger than the average particle size of the soft beads, deformation of the soft beads during heat sealing can be effectively prevented .

When using resin beads, for example, acrylic resin, urethane resin, melamine resin, amino resin, epoxy resin, polyethylene resin, polystyrene resin, polypropylene resin, polyester resin, cellulose resin, vinyl chloride Resin, polyvinyl alcohol, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, ethylene-ethyl acrylate copolymer, polyacrylonitrile, polyamide and other general resins, engineering plastics (polyamideimide, polyether Resin beads made of ether ketone, polyphenylene sulfide, polyacetal, polycarbonate, fluororesin) or the like can be preferably used. Among these, melamine resin is particularly preferable from the viewpoint of comprehensive barcode reading performance.
When glass beads are employed, known (commercially available) glass beads can be employed .

On the other hand, as the matrix resin 7a constituting the overcoat layer 7, a nitrocellulose resin, an acrylic resin, a polyamide resin, a urethane resin, or the like can be suitably used. The amount of adhesion of the overcoat layer 7 containing (1) hard beads 7b and (2) soft beads 7c on the barcode printing layer 5 is preferably about 0.3 to 10 g / m ^{2 by} weight after drying. It is more preferable to set it as 1-5 g / m < ² >. The beads 7b and 7c can be appropriately selected from commercially available ones.

  The total content of (1) hard beads 7b and (2) soft beads 7c in the overcoat layer 7 is generally 1 to 40% by weight, preferably 3 to 30% by weight, based on the solid content. . When the content of (1) the hard beads 7b and (2) the soft beads 7c is less than 1% by weight, the effect of refracting and scattering light is poor, and the barcode reading accuracy is slightly inferior. On the other hand, if it exceeds 40% by weight, the dispersibility of the beads deteriorates, and the sharpness of the bar code itself is hindered, and the bar code reading accuracy is slightly inferior.

  The average particle diameter of the above (1) hard beads 7b and (2) soft beads 7c is preferably about 0.01 to 30 μm, more preferably about 0.5 to 20 μm, and even more preferably 2 to 10 μm. . If the average particle diameter of (1) the hard beads 7b and (2) the soft beads 7c is less than 0.01 μm, the sharpness of the printed surface may be somewhat impaired. On the other hand, if it exceeds 30 μm, the portion of the overcoat layer 7 that protrudes from the matrix increases and the possibility of falling off increases, so it is desirable to avoid it. The average particle diameter is measured with a microscope (such as SEM (Scanning Electron Microscopy) or FE (Field Emission) -SEM). If the beads are spherical, the diameter is measured, and if the beads are non-spherical. Is the longest diameter (the longest distance when an individual bead is sandwiched between two parallel segments on the observation field or its photograph) and the shortest diameter (two parallel beads on the observation field or its photograph). The shortest distance when sandwiched between line segments) is determined, and the arithmetic average value is taken as the average diameter of the beads. Further, the average or average diameter of about 20 beads may be arithmetically averaged to obtain the average particle diameter. The average particle diameter of the metal oxide particles can be measured in the same manner. The overcoat layer may contain the above-described metal oxide particles, known pigments, colorants, dispersants, anti-settling agents, thickeners and the like as long as the effects of the present invention are not impaired.

The laminate of the present invention comprises a press-through pack (PTP) lid, a powder / granule / patch packaging bag, a food / beverage packaging bag and packaging box, a dairy container such as pudding or yogurt. Applicable to well-known packaging materials and packages such as lids, packaging bags and boxes for office supplies, machine parts, daily necessities, kitchenware, etc. Also suitable for labels, sealing strips, trays, price tags, tags, cards, etc. Can be used for
When the laminate of the present invention is used as a lid, it can be used as a lid for paper containers, metal containers, glass containers, resin containers such as polypropylene, polyester, polystyrene, and polyethylene. It can be thermally bonded onto the periphery of the part, preferably on the flange of a container having a flange. Usually, the temperature at the time of heat sealing may be about 120 to 260 ° C., the pressure may be ^{2 to} 250 kg / cm ² , and the time may be about 1 to 3 seconds. When the package is a press-through pack, it can be heat-sealed using a hot plate provided with a grid-like ridge called a mesh seal, and a strong adhesive force and sealability can be obtained.

Next, the result of verifying the operation and effect of the example of the present invention will be described with reference to examples.
(Invention Example 1): (thermal adhesive layer / aluminum foil / black ink barcode / varnish (melamine beads + glass beads))
In Example 1 of the present invention, a bar code using black ink (matrix resin: nitrocellulose, containing 16% by weight of carbon black pigment based on solid content) on the glossy surface of an aluminum foil (thickness: 20 μm, material: 8079 hard material). After drying the barcode part of size (nominal 0.254 mm / module (line thickness minimum 0.2 to maximum 1.25 mm, space minimum 0.3 to maximum 0.8 mm) by gravure printing using gravure plate Next, the melamine beads (average particle size: 2 μm) were 15% by weight based on the solid content weight and the glass beads (average particle size: 3 μm) were 15% by weight based on the solid content. Overcoat layer (matrix resin: nitrocellulose) using a gravure plate so as to cover the barcode part. Scan, coating amount:. Provided 1.8 g / m ²⁾ on a dry weight after Incidentally, melamine beads and glass beads are almost spherical, it was almost clear.
Next, a thermal adhesive mainly composed of vinyl chloride-vinyl acetate-maleic acid copolymer resin is dried on the poppy surface of the aluminum foil (the surface on the opposite side where the barcode portion is printed) by gravure coating, and then by weight. It laminated | stacked so that it might become 3.5 g / m < ² >, and the coating film was dried and it was set as the heat bonding layer.
Thus, a packaging sheet (laminate) of Invention Example 1 was produced.
(Invention Example 2): (thermal adhesive layer / aluminum foil / blue ink barcode / varnish (melamine beads + glass beads))
In Example 2 of the present invention, a barcode was used using blue ink (matrix resin: nitrocellulose, containing 27% by weight of phthalocyanine blue pigment based on solid content) on the glossy surface of an aluminum foil (thickness: 20 μm, material: 8079 hard material). Bar code part of size (nominal 0.254 mm / module (line thickness minimum 0.2 to maximum 1.25 mm, space minimum 0.3 to maximum 0.8 mm) is dried after gravure printing using a gravure plate After that, a packaging sheet (laminate) was produced in the same manner as in Example 1 of the present invention.
(Invention Example 3): (thermal adhesive layer / aluminum foil / green ink barcode / varnish (melamine beads + glass beads))
In Example 3 of the present invention, bar code using green ink (matrix resin: nitrocellulose, containing 31% by weight of phthalocyanine green pigment based on solid content) on the glossy surface of aluminum foil (thickness: 20 μm, material: 8079 hard material) Bar code part of size (nominal 0.254 mm / module (line thickness minimum 0.2 to maximum 1.25 mm, space minimum 0.3 to maximum 0.8 mm) is dried after gravure printing using a gravure plate After that, a packaging sheet (laminate) was produced in the same manner as in Example 1 of the present invention.
(Invention Example 4): (thermal adhesive layer / aluminum foil / black ink barcode / (varnish + yellow pigment) (melamine beads + glass beads))
A packaging sheet (laminate) in the same manner as in Invention Example 1 except that the overcoat varnish described in Invention Example 1 was further mixed with a yellow pigment (disazo pigment) added in an amount of 3.3% by weight based on the weight of the solid content. ) Was produced.
(Invention Example 5): (thermal adhesive layer / aluminum foil / blue ink barcode / (varnish + yellow pigment) (melamine beads + glass beads))
In the present invention example 2, a packaging sheet (laminate) was prepared in the same manner as in the present invention example 2, except that a yellow pigment (disazo pigment) was further added and mixed with 3.3% by weight based on the solid content weight to the overcoat varnish. ) Was produced.
(Example 6 of the present invention): (thermal adhesive layer / aluminum foil / barcode of green ink / (varnish + yellow pigment) (melamine beads + glass beads))
In the present invention example 3, a packaging sheet (laminated body) was obtained in the same manner as in the present invention example 3, except that 3.3% by weight of a yellow pigment (disazo pigment) was further added to and mixed with the overcoat varnish. ) Was produced.
(Invention Example 7): (thermal adhesive layer / aluminum foil / black ink barcode / varnish (melamine beads + glass beads))
A packaging sheet (laminate) was prepared in the same manner as in Example 1 except that the amount of the overcoat layer applied was 2.7 g / m ² in terms of weight after drying. The coating amount of the overcoat layer of Invention Example 1 is 1.8 g / m ² by weight after drying. The appearance of the overcoat layer in Invention Example 7 was milky white.
(Comparative Example 1): (aluminum foil / black ink barcode / varnish)
A packaging sheet (laminate) was prepared in the same manner as in Invention Example 1 except that an overcoat varnish containing no beads was used as the overcoat varnish in Invention Example 1.
(Comparative Example 2): (Thermal adhesive layer / aluminum foil / black ink barcode / varnish (melamine beads))
In Example 1 of the present invention, Example 1 was used except that the overcoat varnish containing 15% by weight of only one melamine bead (average particle size: 2 μm) based on the solid content was used as the overcoat varnish. Similarly, a packaging sheet (laminate) was produced.

These specimens were evaluated for readability using a bar code verifier.
As a barcode verification machine (barcode readability evaluation device) for evaluating the readability of barcodes, TruCheck 401-RL manufactured by Munazo Co., Ltd. was used (the number of scans was 10). SC values (symbol contrast (Rmax-Rmin), unit%), EDGE (edge determination), Rl (maximum reflectance), Rd (Evaluation Examples 1 to 7 and Comparative Examples 1 and 2) Minimum reflectance), MinEC (minimum edge contrast, unit%), MOD (modulation, unit%), Def (defect, unit%), DCD (decode), DEC (easy to decode, unit%), MinQZ (minimum) The evaluation items of the quiet zone were measured. Table 1 shows the results of evaluation of these items and overall evaluation. In addition, Table 2 shows the evaluation point range (complied with The American National Standards Institute = ANSI standard) of the comprehensive evaluation class (stage) in Table 1.

According to Table 1, in Comparative Example 1 containing no beads, the SC value was 91 and the overall evaluation was F, and the reading accuracy was not possible. Comparative Example 2 containing melamine beads, which are general resins, and not containing hard beads, has an overall evaluation of 3.9 (evaluation class A) at this stage (stage before heat sealing). It is not inferior in comparison with Invention Examples 1-7.
The results of Examples 1 to 7 of the present invention are all in evaluation class A, and a very large improvement in reading accuracy is recognized as compared with Comparative Example 1. In addition, the results of Examples 1 to 7 of the present invention do not depend on the following factors (e1) to (e3).
(E1) Color of ink for barcode printing (e2) Presence or absence of yellow pigment in overcoat layer (e3) Large or small amount of adhesion of overcoat layer within predetermined range Regardless of the above factors (e1) to (e3), In the inventive examples 1 to 7, the SC value is 95 to 110 and the overall evaluation is A, and the improvement in the readability of the bar code based on the present invention is obvious.

  Next, the result of having verified about the effect of the readability of the barcode part after heat sealing is demonstrated. In Comparative Example 1, no beads were included, and reading accuracy was not possible at the stage before heat sealing. Using the packaging sheets (laminates) of Invention Examples 1 to 7 and Comparative Example 2 as lids for PTP containers (polypropylene resin sheets formed with a large number of pockets for accommodating drug capsules), the pocket opening periphery The surface of the flange extending to the surface and the heat bonding layer surface of the packaging sheet were heat-bonded by applying a mesh seal of 190 ° C. × 0.3 MPa × 1 second using a heat sealing machine manufactured by CKD Corporation. The bar code part of the PTP package after mesh sealing was evaluated for readability by a bar code verifier in the same manner as described above. The results are shown in Table 3.

  According to Table 3, in Comparative Example 2 including only melamine beads, which are general resins, the Def value was 45 and the overall evaluation was 0 (evaluation class F (impossible)). On the other hand, in Inventive Examples 1 to 7, the Def value is 11 or less, and the overall evaluation is 3.5 to 3.9 (all are evaluation class A). The high reading accuracy of the barcode based is obvious. As before heat sealing, the influences of the above factors (e1) to (e3) were not observed after heat sealing. When the beads in the overcoat layer of Comparative Example 2 were observed with a microscope, the beads were irregularly deformed, but in the samples of Invention Examples 1 to 7, almost no deformation of the beads was observed.

Next, the results of verifying the effect of improving the wear resistance using Example 8 of the present invention will be described.
(Invention Example 8): (thermal adhesive layer / aluminum foil / black ink barcode / varnish (melamine beads + glass beads + silica particles))
In Example 8 of the present invention, a bar code using black ink (matrix resin: nitrocellulose, containing 16% by weight of carbon black pigment based on solid content) on the glossy surface of an aluminum foil (thickness: 20 μm, material: 8079 hard material). After drying the barcode part of size (nominal 0.254 mm / module (line thickness minimum 0.2 to maximum 1.25 mm, space minimum 0.3 to maximum 0.8 mm) by gravure printing using gravure plate Next, melamine beads (average particle size: 2 μm) were 15% by weight based on the solid content weight and glass beads (average particle size: 6 μm) were 3% by weight based on the solid content. Furthermore, using the varnish for overcoat containing 5% by weight of silica particles (average particle diameter: 3 μm) as metal oxide particles based on the weight of solid content, An overcoat layer (matrix resin: nitrocellulose, coating amount: 1.8 g / m ^{2 by} weight after drying) was provided using a gravure plate so that the melamine beads and glass beads were almost spherical, It was almost transparent.
Next, a thermal adhesive mainly composed of vinyl chloride-vinyl acetate-maleic acid copolymer resin is dried on the poppy surface of the aluminum foil (the surface on the opposite side where the barcode portion is printed) by gravure coating, and then by weight. It laminated | stacked so that it might become 3.5 g / m < ² >, and the coating film was dried and it was set as the heat bonding layer.
Thus, a packaging sheet (laminate) of Invention Example 8 was produced.
Flange surface extending around the periphery of the pocket opening, using the packaging sheet (laminate) of Invention Example 8 as a lid for a PTP container (polypropylene resin sheet formed with a large number of pockets for containing drug capsules) And a heat bonding layer surface of the packaging sheet were subjected to 190 ° C. × 0.3 MPa × 1 second mesh seal and heat bonded using a heat sealing machine manufactured by CKD Corporation. The bar code part of the PTP package before and after the mesh seal was evaluated by the bar code verifier in the same manner as described above. The results are shown in Table 4.

  Moreover, abrasion resistance was evaluated using the packaging sheet (laminate) of Invention Example 8 and Invention Example 1. In the evaluation method, two packaging sheets were prepared, the overcoat surfaces were opposed to each other, and one packaging sheet was rubbed with the other packaging sheet 20 times with fingers. In Example 8 of the present invention, the overcoat surface hardly changed, whereas in Example 1 of the present invention, fine flaws occurred and the commercial value was lowered. From these results, it was found that in processes and applications that require wear resistance, the wear resistance is improved by adding metal oxide particles (particularly silica) to the overcoat layer.

  The structures of the embodiments of the present invention disclosed above are merely examples, and the scope of the present invention is not limited to the scope of these descriptions. The scope of the present invention is indicated by the description of the scope of claims, and further includes meanings equivalent to the description of the scope of claims and all modifications within the scope.

  The laminated body and package of the present invention can accurately read a downsized and high-density barcode using a commercially available barcode reader, so it is expected to contribute to quality control in this field. In particular, it is useful for preventing drug mixup, managing expiration dates, and preventing counterfeiting.

DESCRIPTION OF SYMBOLS 1 Aluminum foil, 3 White colored layer, 5 Bar code part, 7 Overcoat layer, 7a Resin, 7b Hard bead, 7c Soft bead, 17 Thermal adhesive layer.

Claims (6)

A base material layer including a metal thin film layer;
A barcode printing layer located on at least a portion of the substrate layer;
An overcoat layer positioned to cover the barcode printing layer,
The overcoat layer is composed of a matrix resin and beads dispersed in the matrix resin,
(1) Gala Subi over's, and,
(2) Acrylic resin, urethane resin, melamine resin, amino resin, epoxy resin, polyethylene resin, polystyrene resin, polypropylene resin, polyester resin, cellulose resin, vinyl chloride resin, polyvinyl alcohol, ethylene -At least one resin bead selected from vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, ethylene-ethyl acrylate copolymer, polyacrylonitrile, polyamide;
Including both
The beads have an average particle diameter of 0.01Myuemu～30myuemu, the total content of the overcoat layer is Ri 1 to 40 wt% der based on solids, and an average particle diameter of the beads of the (1) Is larger than the average particle diameter of the resin beads of (2) above , a laminate. The laminate according to claim 1, wherein the overcoat layer further contains one or more color pigments, and / or the base material layer contains a colored layer. The laminate according to claim 1 or 2, wherein the base material layer includes a thermal adhesive layer. The laminate according to any one of claims 1 to 3, wherein the beads of (1) and the beads of (2) are transparent. When the laminate is heat-sealed to the peripheral edge of the opening of the container as a cover sheet of the container, the beads of (1) have a heat-sealing temperature of 120 to 260 ° C., a pressure of ^{2 to} 250 kg / cm ² , and a time of 1 The laminate according to any one of claims 1 to 4, which has a hardness that is not deformed by a pressure during heat sealing under a condition of ~ 3 seconds. A package comprising the laminate according to any one of claims 1 to 5.

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