JP4711654B2 - Lid and packaging body using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lid material or the like allowing superior production efficiency which improves visibility of a print layer and makes a base material layer hard to break, is preferable in terms of work environment or environmental protection, does not require printed law materials to be stocked, and facilitates an alteration in a print design. <P>SOLUTION: The lid material 10 comprises a flexographic printing layer 11, a base material layer 12, a resin film layer 13, and a heat adhesive layer 14, which are successively laminated in this order from the outer surface side to the inner surface side. The lid material 10 is used to provide a package serving as the lid of a container for food or the like. <P>COPYRIGHT: (C)2006,JPO&amp;NCIPI

Description

  The present invention relates to a lid for a container of food or the like and a package using the same.

  As a typical example of conventional lids for containers such as foods, as shown in Patent Document 1, an exterior resin film such as PET (polyethylene terephthalate), a gravure printing layer, aluminum, in order from the outer surface to the inner surface of the lid A laminate of foil or paper and a thermal adhesive layer is known. Such a conventional lid has the following problems.

First, since a large amount of solvent is required for gravure printing, it takes a long time to completely dry, and it is not preferable from the viewpoint of working environment and environmental protection. Second, since it is necessary to perform gravure printing at the initial stage of the manufacturing process, it is difficult to change the printing design, and it is necessary to stock the printed material. Thirdly, since the exterior resin film is the outermost layer, light reflection or refraction occurs due to the exterior resin film, making it difficult to see the printed layer. Fourth, when a line seal is applied, the aluminum foil or the paper layer is easily broken.
JP-A-9-323377

  Accordingly, an object of the present invention is to improve the visibility of a printed layer and at the same time provide a production method of a lid material or the like that is difficult to tear a base material layer. It is also preferable from the viewpoint of working environment and environmental protection, and it is not necessary to stock printed materials, and to provide a lid material and the like that can easily change the printing design.

  In order to solve the above-described problems, the lid material of the present invention is formed by sequentially laminating a flexographic printing layer, a base material layer, a resin film layer, and a thermal bonding layer from the outer surface toward the inner surface. For the flexographic printing layer, it is preferable to use an ultraviolet curable ink. Further, the ultraviolet curable ink is preferably solvent-free and has heat resistance.

Here, the base material layer preferably includes an aluminum foil . Moreover, when using aluminum foil as a base material layer, it is preferable that at least one surface of aluminum foil is primer-coated. The thickness of the aluminum foil is preferably 5 to 100 μm.

The resin film layer is preferably made of a polyester film having a thickness of 3 to 25 μm .

  The lid material of the present invention can be used as a package by thermally bonding to the flange of a container having a flange.

  In this invention, since the cover material is printed by flexographic printing, no solvent is required and no drying process is required. Therefore, it can be manufactured with low production cost and short production time, which is preferable from the viewpoint of working environment and environmental protection. Moreover, since printing can be performed in the final process, the original fabric before printing can be stocked. Further, the flexographic printing plate can be easily changed in print design and the like as compared with the gravure plate.

  In addition, in the case of flexographic printing, since it is not necessary to laminate an exterior resin film on the outermost surface, the printed layer has excellent visibility. Since the cushioning property is increased by providing the resin film layer under the base material layer, it is possible to provide a lid material in which the base material layer is not easily broken.

  By using a solvent-free ultraviolet curable ink, the curing time is shortened and the productivity of the lid material is improved. In addition, by using a UV-curable ink having heat resistance, an exterior protective film becomes unnecessary, and a lid material having heat resistance equal to or higher than that of the conventional one can be provided.

By including an aluminum foil in the base material layer, the barrier property of the lid material can be improved. Moreover, when a base material layer contains aluminum foil, when a primer coat layer is interposed between a printing layer and a base material, it is further excellent in the visibility of a printing layer and the adhesiveness of a printing layer improves. By setting the thickness of the aluminum foil to 5 to 100 μm, it is possible to obtain more excellent water and moisture resistance, strength, handleability of the package, shape retention, and the like.

  When the resin film layer is a polyester film having a thickness of 3 to 25 μm, an optimal cushioning property that prevents the base material layer from being easily broken is obtained. Furthermore, damage to the printing layer can be prevented by applying an overcoat treatment to the outer surface of the flexographic printing layer.

  Even if the lid of the present invention is thermally bonded and line-sealed to the flange of a container having a flange, cracks do not occur due to the presence of the resin film, so that hermetic sealing can be performed without deteriorating barrier properties.

  Embodiments of the present invention will be described below. As shown in FIG. 1, the lid 10 of the present invention is a laminate in which a flexographic printing layer 11, a base material layer 12, a resin film layer 13, and a thermal bonding layer 14 are sequentially laminated from the outer surface toward the inner surface.

The base material layer 12 preferably includes at least an aluminum foil . Particularly for food packaging, it is preferable to use an aluminum foil having a barrier property.

  The aluminum foil may be either a pure aluminum foil or an aluminum alloy foil. Specifically, pure aluminum (JIS (AA) 1000 series, such as 1N30, 1N70, etc.), Al-Mn series (JIS (AA) 3000 series, such as 3003, 3004, etc.), Al-Mg series (JIS (AA)). 5000 series), Al-Fe series (JIS (AA) 8000 series, such as 8021, 8079, etc.). The components such as Fe, Si, Cu, Ni, Cr, Ti, Zr, Zn, Mn, Mg, and Ga contained in the aluminum foil may be within the range of known contents defined by JIS and the like. Absent.

The thickness of the aluminum foil is preferably 5 to 100 μm, particularly preferably 10 to 60 μm .

By setting within such a range, more excellent water and moisture resistance, strength, handleability of the package, shape retention, and the like can be obtained.

When an aluminum foil is used, it may be a hard material, a semi-hard material, a soft material, or the like, and may be appropriately selected according to the shape of the container, the type of contents, and the like.

In addition, the aluminum foil can be molded, degreased / cleaned anchor coat, primer coat, surface treatment and the like by a known method if necessary.

As the base material layer 12 used in the present invention, at least the above-described aluminum foil may be used according to the application, required performance, cost and the like .

  A thermal adhesive layer 14 is laminated on one surface of the base material layer 12 via a resin film layer 13. The resin film layer 13 is the same as described above, for example, a resin film having a thickness of 6 to 50 μm, specifically, polyamide (nylon), high density polyethylene, polypropylene, PEN (polyethylene naphthalate), vinylidene chloride, ethylene-vinyl alcohol copolymer. , Vinyl chloride, PET (polyethylene terephthalate), PBT (polybutylene terephthalate), ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, etc. can be used alone or in combination, and other known packaging materials A resin film can also be employed. Among these, it is particularly preferable to use a polyester resin having a thickness of 3 to 25 μm, particularly PET. By interposing the resin film layer 13 between the base material layer 12 and the thermal bonding layer 14, embossing and line sealing can be performed without the base material layer 12 being torn.

  Examples of the thermal adhesive layer 14 include high density polyethylene, medium density polyethylene, low density polyethylene, linear linear polyethylene, unstretched polypropylene, vinyl chloride, vinyl chloride-vinyl acetate copolymer resin, vinyl chloride-vinyl acetate-maleic anhydride. Copolymer resin, polystyrene resin, polystyrene modified resin, acrylic acid-styrene copolymer resin, ethylene-vinyl acetate copolymer, methyl methacrylate (MMA), butyl methacrylate (BMA), ethylene-acrylic acid copolymer, EAA (Ethylene-acrylic acid copolymer), EMAA (ethylene-methacrylic acid copolymer), EEA (ethylene-ethyl acrylate copolymer), EMAC (ethylene-methyl acrylate copolymer), ionomer, Sumitomo Chemical Co., Ltd. Company bondine (ethylene- Tyracrylate-maleic anhydride terpolymer), Tosoh Co., Ltd. Mersen M (polyolefin adhesive resin), carboxylic acid-modified polyethylene, carboxylic acid-modified polypropylene, carboxylic acid-modified EVA, and other heat-adhesive resins. At least one kind can be adopted, and among these, the use of a vinyl chloride copolymer resin or a carboxylic acid-modified polypropylene is preferable. Of course, other known hot melt resins and heat seal lacquers can also be used.

  The thickness of the thermal adhesive layer 14 is preferably 2 to 100 μm, and if it is less than 2 μm, it is difficult to obtain a sufficient adhesive force, and if it exceeds 100 μm, the cost may increase and the barrier property of the thermal adhesive layer 14 itself may be reduced. So there is no need to make it unnecessarily thick. In addition, although heat-adhesion (heat-sealing) conditions are suitably selected according to the resin and film to be used, it is normally about 1-3 seconds at 140-260 degreeC.

  Lamination of the resin film layer 13 and the heat bonding layer 14 can be carried out by a known method. For example, a method by dry lamination, coextrusion, extrusion coating, thermal lamination using an anchor coating agent, or the like can be adopted.

The flexographic printing layer 11 may be formed on the other surface of the base material layer 12 by directly performing flexographic printing to form the flexographic printing layer 11 or after performing primer coating. In the primer coating treatment, a known primer coating agent can be used, and a primer coating agent containing a matting agent may be used. Primer coating agents include nitrocellulose-based, acrylic-based, ethylene-vinyl acetate copolymer system, vinyl chloride-vinyl acetate-maleic acid copolymer system (chloroacetate-maleic acid copolymer), vinyl chloride-vinyl acetate copolymer system. A primer coating agent mainly composed of polyamide, alkyd, urethane, epoxy or the like may be applied so as to have a weight of about 0.5 to 5 g / m ² after drying. As the matting agent, a matting agent such as calcium carbonate, clay, silica, talc, barium sulfate or the like may be used, and may be appropriately blended in the primer coating agent. Usually, the blending amount of the matting agent is preferably about 1 to 10% by weight in the primer coating agent. By applying a primer coat treatment between the surface of the base material layer 12 on which flexographic printing is performed, that is, between the base material layer 12 and the flexographic printing layer 11, the adhesion between the base material layer 12 and the flexographic printing ink is improved. In particular, the visibility of the printed layer 11 is improved by applying a primer coat containing a matting agent.

Further, the outer surface of the flexographic printing layer 11, that is, the outermost surface in the case of a package , may be left as it is.

  Flexographic printing is a relief printing using a rubber plate or a resin plate. A rubber plate or a resin plate (letter plate) is wound around a cylindrical cylinder, and ink is supplied by an anilox roll. Excess ink is scraped off by a doctor blade or a doctor roll. This is a printing method in which the ink adhered to the relief printing plate is pressed and transferred to the printing surface.

  The ink used for flexographic printing is preferably an ultraviolet curable ink, and more preferably has a heat resistant temperature of 250 ° C. or higher after curing. As the ultraviolet curable ink, a known ultraviolet curable ink can be used. For example, an ultraviolet curable ink disclosed in Japanese Patent Application Laid-Open No. 2000-192260 and Japanese Patent No. 2712254, and a commercially available ultraviolet curable ink can be used. Can do. Specifically, a compound having an average molecular weight of 800 or more and containing an average of one or more epoxy groups in the molecule, or a compound containing acryloyl group, methacryloyl group or other photosensitive group and carboxyl group in the molecule UV curable ink containing these reaction products and a photopolymerization initiator, UV curable by adding 0.1 to 10% by weight of aziridine in solid content ratio to an acrylate resin having a urethane bond in the main molecular chain Type ink and other known ultraviolet curable inks can be used.

  Commercially available ultraviolet curable inks include Dainippon Ink & Chemicals' Lumicur DPA-600T, DPA-620, TMN-300, PEA-300, ETA-300, DTA-400, DCA-200, Dicure FL-01, Examples include ROYOFLEX-AL-F manufactured by Sun Chemical.

  A photopolymerization initiator, a pigment, an additive, a solvent and the like are appropriately added to these ultraviolet curable inks as necessary.

  Examples of the photopolymerization initiator include benzophenone and derivatives thereof, benzyl, benzoin and alkyl ethers thereof, thioxanthone and derivatives thereof, lucillin TPO, Irgacure manufactured by Ciba Specialty Chemicals, Esacure manufactured by Fratelli Lamberti.

  Examples of the pigment include phthalocyanine-based, azo-based, titanium white, and other known color pigments, and extender pigments such as silica, talc, clay, barium sulfate, and calcium carbonate. In particular, silica is an ultraviolet curable ink. After curing, it has an anti-blocking effect when the film is wound.

  Additives include polymerization inhibitors such as 2-tertiarybutylhydroquinone, antifoaming agents such as silicon, fluorine compounds and acrylic polymers, and leveling agents, which are added as necessary. In principle, the solvent is unnecessary, but it is also possible to add it if necessary.

  As the solvent, an organic solvent such as toluene, xylene, methyl ethyl ketone, isopropyl alcohol, ethanol, methanol, butanol, or a mixed solvent of two or more of them can be used. When these solvents are used, the UV curable ink is substantially removed by coating and printing and then drying. Thereafter, the coating film, that is, the printed layer is cured by irradiating with ultraviolet rays, and the adhesiveness, solvent resistance, chemical resistance, heat resistance and the like of the printed layer are improved.

  Next, as shown in FIG. 2, the packaging body 20 of the present invention includes a container 21, a content 22 stored in the container 21, and a lid 10 that is thermally bonded to the opening of the container 21.

  The container 21 used in the package 20 of the present invention is any of a resin film molding container, a paper container, a metal container, a glass container, an injection molded resin container such as polypropylene, polyester, polystyrene, and polyethylene. The material, shape, molding method, and the like may be appropriately employed depending on the type of contents.

As shown in FIG. 2, the lid 10 of the present invention can be thermally bonded onto the flange 21a of the container 21 having the flange 21a. In particular, a line seal 10a (also referred to as a ring seal) having a concave or convex cross-sectional shape after heat bonding is preferably applied. Such a wire seal 10a is obtained by providing concave or convex strips on a hot plate during heat sealing in a ring shape and pressurizing the peripheral edge of the lid member, that is, directly above the container flange 21a. Usually, the temperature at the time of heat sealing is 140 to 260 ° C., the pressure is ^{2 to} 250 kg / cm ² , and the time is about 1 to 3 seconds. As shown in FIG. 2, when the cross section is concave, the width of the concave portion may be about 0.5 to 2 mm and the depth may be about 0.2 to 0.8 mm. The cross-sectional shape of the ridges and ridges is not necessarily rectangular, and may be any shape such as trapezoidal, semicircular, semielliptical, and triangular.

  The contents 22 of the package 20 are best suited for foods such as yogurt, pudding, and jelly, but may be chemicals, beverages, chemicals such as detergents and fragrances, and electrical / electronic components.

  Hereinafter, more detailed examples and comparative examples will be given. About the Example and the comparative example, the printing ink heat resistance test, the line seal characteristic test, and the visibility test were performed.

For the printing ink heat resistance test, for each of the examples and comparative examples, a hot plate at temperatures of 200 ° C., 225 ° C., 250 ° C., 275 ° C., and 300 ° C. was applied to the printing side surface at 5 kg / cm ² for 2 seconds. The pressing was performed by observing the degree to which the printing ink was taken on the hot plate.

The test of the line seal property was performed by applying a line seal with a recess width of 1 mm and a depth of 0.5 mm to a flange of a PET container on each cover material punched to about 70φ at 250 ° C. and 100 kg / cup. The state was observed by observing with a stereomicroscope of 50 magnification.

  The visibility test was performed by evaluating the sharpness of the printed layer in five steps on the basis of the following criteria for each of the examples and the comparative examples by using five monitors, and obtaining the average value. The visibility test is 1 if you feel unclear and blurred, 2 if you feel slightly blurred and slightly blurred, or 3 if you cannot say clear or unclear. The evaluation score was 4 when it was clear and felt close to the original color of the pigment, and 5 when it was vivid and felt that it was the original color of the pigment.

Example 1
As Example 1, from the outer surface to the inner surface, in order, flexographic printing of ultraviolet curable ink, primer coat (1 g / m ² ), 40 μm soft aluminum foil (μm indicates thickness; the same applies hereinafter), dry lamination. A lid made of an adhesive (3 g / m ² ), a 12 μm biaxially stretched PET film, and a heat seal coat (4 g / m ² ) was produced. The cover material is prepared by applying a primer coating agent based on chloroacetic acid bismaleic acid copolymer (vinyl chloride-vinyl acetate-maleic acid copolymer) and acrylic acid resin on one side of an aluminum foil by a gravure method. Then, a biaxially stretched PET film is laminated on the opposite surface using a polyester-based dry laminate adhesive, and a heat seal coating agent mainly composed of an acrylic modified polyurethane resin and an acrylate ester resin is formed on the PET film surface. Apply by gravure method, apply flexographic printing of UV curable ink (Sun Chemical ROYOFLEX-AL-F with acrylic monomer as the main component) on the primer coat surface, and then irradiate with UV to print layer It was by stamping the cured product into a suitable shape.

[ Reference Example 2 ]
As Reference Example 2 , in order from the outer surface to the inner surface, UV-curable ink flexographic printing, 40 μm soft aluminum foil, dry laminate adhesive (3 g / m ² ), 12 μm biaxially stretched PET film, heat seal coat (4 g / m ² ) was produced. The lid material is produced by laminating a biaxially stretched PET film on one side of an aluminum foil using a polyester-based dry laminate adhesive, and an acrylic modified polyurethane resin and an acrylate ester as main components on the PET film surface. The heat seal coating agent is applied by a gravure method, and the other side is directly subjected to flexographic printing with ultraviolet curable ink (ROYOFLEX-AL-F made by Sun Chemical, which mainly contains acrylic monomer), and then ultraviolet rays are applied. The printed layer was cured by irradiating with an appropriate shape.

( Reference Example 3)
As Reference Example 3, in order from the outer surface to the inner surface, overprint coat (1.5 g / m ² ), flexographic printing of UV curable ink, primer coat (1 g / m ² ), 40 μm soft aluminum foil, dry laminate adhesion A lid made of an agent (3 g / m ² ), a 12 μm biaxially stretched PET film, and a heat seal coat (4 g / m ² ) was produced. The cover material was prepared by applying a primer coating agent mainly composed of a chloroacetic acid maleic acid copolymer and an acrylic resin on one side of an aluminum foil, using a gravure system, and then using a polyester dry laminate adhesive on the opposite side. A biaxially stretched PET film is laminated, and a heat seal coating agent mainly composed of an acrylic-modified polyurethane resin and an acrylate ester resin is applied to the PET film surface by a gravure method, and the primer coating surface is UV cured. Flexographic printing of mold ink (ROYOFLEX-AL-F made by Sun Chemical Co., whose main component is an acrylic monomer), and then curing the printed layer by irradiating with ultraviolet rays, and using a transparent varnish on the printed layer It was based on punching out the thing which gave the overprint coat in the shape suitably.

[ Reference Example 4 ]
As Reference Example 4 , in order from the outer surface to the inner surface, UV-curable ink flexographic printing, 60 g / m ² coated paper, dry laminate adhesive (3 g / m ² ), 12 μm biaxially stretched PET film, heat seal coat (4 g / M ² ). The method for producing the lid material was the same as that of Example 2 except that the aluminum foil of Example 2 was replaced with coated paper.

Example 5
As Example 5, from the outer surface toward the inner surface, UV-curable ink flexographic printing, primer coat (1 g / m ² ), 40 μm soft aluminum foil, dry laminate adhesive (3 g / m ² ), 12 μm biaxially stretched PET A lid made of a film and a heat seal coat (4 g / m ² ) was produced. The lid is made by applying a primer coating agent consisting mainly of a solution-type thermosetting type nitrocellulose and acrylic blend resin on one side of an aluminum foil in a gravure method and then a polyester dry laminate adhesive on the opposite side. A biaxially stretched PET film is laminated using, and a heat seal coating agent mainly composed of an acrylic-modified polyurethane resin and an acrylate ester resin is applied to the surface of the PET film by a gravure method. Flexographic printing of UV curable ink (ROYOFLEX-AL-F made by Sun Chemical whose main component is acrylic monomer) is applied, and then the printed layer is cured by irradiating with UV rays and then punched into an appropriate shape. According.

In each of the above examples, ROYOFLEX-AL-F manufactured by Sun Chemical, which has an acrylic monomer as a main component, was used as a UV curable ink without solvent, and solid printing with a coating amount of about 2 g / m ² was performed. Further, the printing ink of each example and each comparative example contained a color pigment (phthalocyanine blue) in a solid content of 15% by weight.

[Comparative Example 1]
As Comparative Example 1, a cover material composed of an overprint coat, gravure printing, 40 μm soft aluminum foil, and heat seal coat (4 g / m ² ) was produced in order from the outer surface to the inner surface. The method for producing the lid material is that gravure printing (coating amount 2.0 g / m ² ) mainly composed of nitrocellulose is applied to one side of an aluminum foil, and the printed layer is heated and cured in an oven at 150 ° C. An overprint coat (coating amount 1.5 g / m ² ) consisting mainly of a blend resin of solution-type thermosetting nitrocellulose and acrylic is further applied by gravure on the opposite side, and acrylic modified polyurethane resin and acrylic on the opposite side By applying a heat seal coat agent mainly composed of an acid ester resin by a gravure method, it was punched into a suitable shape.

(Comparative Example 2)
As Comparative Example 2, a cover material composed of an overprint coat, gravure printing, primer coat, 40 μm soft aluminum foil, and heat seal coat (4 g / m ² ) was prepared in order from the outer surface to the inner surface. The lid material was prepared by applying a primer coating agent (coating amount 1 g / m ² ) consisting mainly of a chloroacetic acid maleic acid copolymer and an acrylic acid resin on one side of an aluminum foil, and nitrocellulose as the main component. After applying gravure printing (coating amount 2.0 g / m ² ) as a component and heating and curing the printing layer in an oven at 150 ° C., a solution type thermosetting type nitrocellulose and acrylic blend resin is formed thereon. Overprint coat (coating amount 1.5g / m ² ) with main component is further applied by gravure method, and heat seal coating agent with main component of acrylic modified polyurethane resin and acrylate ester resin on the opposite side is gravure method. It was by punching out what was given in step to the appropriate shape.

(Comparative Example 3)
As Comparative Example 3, a cover material made of 12 μm biaxially stretched PET film, dry laminate adhesive, gravure printing, 40 μm soft aluminum foil, and heat seal coat (4 g / m ² ) was prepared in order from the outer surface to the inner surface. The lid is made by gravure printing (coating amount 2.0 g / m ² ) mainly composed of nitrocellulose on one side of a soft aluminum foil, and a biaxially stretched PET film is solvent-type dry laminated on it. Laminate using an adhesive (applying amount 3 g / m ² ), and punch the shape of the opposite surface with a heat seal coat agent mainly composed of acrylic-modified polyurethane resin and acrylate ester resin in the gravure method. It was good.

  The test results are shown in FIG. In the figure, ○ in the column of the printing ink heat resistance test indicates that no printing ink is taken on the hot plate, △ indicates that the area where the printing ink is taken on the hot plate is less than 30%, and x shows on the hot plate. It shows that the area where printing ink is taken is 30% or more. In the figure, ○ in the column of the line seal property test indicates that no cracks were observed in the base material layer, and × indicates that cracks (cracks) were generated in the base material.

  From FIG. 3, in the heat resistance test of the printing ink, in the comparative example, the area where the printing ink is taken on the hot plate increases as the temperature rises. It can be seen that the example is far superior in heat resistance. Here, in the comparative example, when the temperature of the hot plate is high, the printing ink is removed because the overprint coat or biaxially stretched polyester film corresponding to the outermost surface of the packaging material is partially melted or heated by contact with the hot plate. This is because it deforms and does not protect the printing ink layer.

  Further, in the line seal characteristic test, no cracks are observed in the base material layer in the examples, whereas cracks are observed in the base material layers in the comparative examples. As a result, it can be seen that a line seal can be applied without tearing the base material layer by interposing the resin film layer between the base material layer and the thermal adhesive layer as in the example.

  In the visibility test, the score based on the above calculation method is 1.4 to 2.4 in the comparative example, whereas it is 4.2 to 5.0 in the example. It can be seen that the example is far superior in terms of visibility.

Sectional drawing which shows an example of the cover material of this invention Sectional drawing which shows an example of the package of this invention Table showing test results of Examples and Comparative Examples

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cover material 10a Line seal 11 Flexo printing layer 12 Base material layer 13 Resin film layer 14 Thermal bonding layer 20 Package 21 Container 21a Flange 22 Contents

Claims (7)

From the outermost surface to the inner surface, a heat-resistant temperature after curing is 250 ° C. or more, a flexographic printing layer using a solvent-free UV-curable ink having heat resistance, a primer coat layer, a base material layer consisting only of an aluminum foil, A lid made by laminating a resin film layer and a thermal adhesive layer sequentially. The lid according to claim 1 , wherein the ultraviolet curable ink contains an acrylic monomer as a main component.   The lid material according to claim 1, wherein the aluminum foil has a thickness of 5 to 100 μm. The lid according to any one of claims 1 to 3 , wherein the resin film layer is made of a polyester film having a thickness of 3 to 25 µm. The lid according to any one of claims 1 to 4 , wherein the primer coating layer contains a matting agent selected from calcium carbonate, clay, silica, talc, and barium sulfate. A package comprising the lid according to any one of claims 1 to 5 thermally bonded to the flange of a container having a flange. A package in which the lid material according to any one of claims 1 to 5 is line-sealed to the flange of a container having a flange.

Images