JP2006350313A - High luminance label, container to which the label is stuck and method for manufacturing them - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an in-mold forming label or a cold-glue label satisfying both of high-luminance appearance having excellent metallic gloss and contents resistance, a container to which the label is stuck and a method for manufacturing the label and the container. <P>SOLUTION: The in-mold forming label is constituted of a transparent film 1 having a printing surface including at least one of high luminance gold printing and silver printing 2 having metallic gloss, an adhesive layer 4 formed on the printing surface side of the transparent film 1, a thermoplastic resin base material layer 6, and a heat seal layer 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  In the present invention, the label is set in advance so as to be in contact with the mold wall surface, and the molten thermoplastic resin parison is guided into the mold and hollow molded, or the molten thermoplastic resin is injection molded or melted. This is a label for in-mold molding that is used for in-mold molding in which a thermoplastic resin sheet is vacuum-formed or pressure-molded to produce a resin-molded product with a label, or made of plastic such as glass, metal, ceramics, polyolefin, polyethylene terephthalate, etc. The present invention relates to a cold glue label that is mainly attached to a bottle or the like by using a water-based paste by a high-speed labeling device, and a container to which these labels are attached. Furthermore, it is related with the manufacturing method of the container which stuck these labels.

After the label is set in the mold in advance, a thermoplastic resin is injected into the mold, and the container is molded by injection molding, hollow molding, differential pressure molding, foam molding, etc. As labels for in-mold molding used in the molding method, several labels are disclosed and known, for example, in Patent Document 1, Patent Document 2, and the like.
In addition, a label having a good absorbability with respect to moisture serving as a solvent for the water-based paste is required as a cold glue label, and some labels have been disclosed so far, for example, Patent Document 3, Patent Document 4, and the like. Proposed in

There is an increasing demand for such a label having a thermoplastic resin film as a base layer from the viewpoint of water resistance, strength, antifungal property and the like. Further, from the viewpoint of design, there is a demand from the market for a label having a high brightness texture (metal glossiness, metallic feeling) of gold or silver and having a high glossiness on the surface. These labels are used by sticking to containers. In addition to the appearance, the labels are rubbed strongly when the contents such as various beverages, oils, detergents, shampoos, etc. overflow from the containers. There is a growing demand for labels that do not lose information such as the design, trademarks, and cautionary notes given to the labels.
Conventionally, in order to obtain such a label, ultraviolet light (UV) is used after printing with a high-intensity gold ink and / or silver ink having a metallic luster directly on the surface of the label, or after providing a predetermined design by foil stamping. ) It was common to apply a curable varnish with a thickness of 1 to 10 [mu] m and then provide a protective film by drying. However, this method has a drawback that a high gloss appearance cannot be obtained by varnish. In addition, there is a problem that printing and foil dropping when the contents of the container are spilled are not sufficient.

An in-mold label formed by applying or printing a high-brightness coating agent and normal ink on one side of a transparent film and directly applying an in-mold adhesive thereon, as a solution to such problems. This is proposed in Patent Document 5. This in-mold label has a high-brightness coating agent-printed surface protected by a transparent film, and a high gloss appearance can be obtained at the same time. However, since this label has an adhesive directly on the printing surface, for example, when in-mold injection (injection molding), ink flows due to the injected high-pressure molten resin, and only the intended high-intensity printing In addition, there is a problem that the normal printed part is lost. In addition, when performing in-mold blow (hollow molding), the heat and pressure of the molten resin breaks the orientation of the metal thin film strips in the high-brightness coating agent, and ultimately the desired metallic luster may not be obtained. There is a problem that unevenness of appearance occurs.
Similarly, from the viewpoint of design, there is a method to obtain a high-luminance appearance by metal deposition as a method to give a high-luminance texture (metallic luster, metallic feeling), but this method requires a dedicated device. Therefore, there are problems that the process becomes complicated, the productivity is low, and the production cost is high, which is not general.

JP 58-069015 A Japanese Patent Laid-Open No. 01-125225 JP-A-10-212367 JP-A-10-254362 JP 2002-196675 A

  Therefore, in the present invention, a high-gloss label based on a thermoplastic resin film, which has a printed surface printed with a high-gloss gold ink and / or silver ink having a metallic luster, the printed surface being It is an in-mold molding label or a cold glue label that is not damaged by the above-mentioned contents, and that the printed surface is not damaged by the molten resin or the like when it is attached to a container. It is an object of the present invention to provide a container to which a label is attached and a method for manufacturing the same.

  As a result of diligent research by the present inventors, a printing surface including a high-gloss gold and / or silver printing having a metallic luster is formed on one side of a transparent film, and an adhesive layer and a thermoplastic resin are formed on the printing surface. Forming a printing surface including high brightness gold and / or silver printing with metallic luster on one side of the base layer, the in-mold molding label laminated in the order of the heat seal layer, or the thermoplastic resin base layer, When an in-mold molding label is formed by laminating a transparent film on the printed surface through an adhesive layer and laminating a heat seal layer on the surface opposite to the printed surface of the thermoplastic resin substrate layer, the high brightness The present inventors have found that a label that satisfies both a high gloss appearance, content resistance and workability can be obtained, and the present invention has been completed.

The transparent film used in the present invention contains at least one selected from polyethylene, polypropylene, polyethylene terephthalate, polystyrene, and polyvinyl chloride, and preferably has a haze value of 0 to 20%.
Moreover, it is preferable that the high-intensity gold and / or silver printing having a metallic luster is provided by at least one method selected from gravure printing, flexographic printing, screen printing, and offset printing.
The present invention includes a cold glue label in which the heat seal layer of the in-mold molding label is replaced with a cold glue receiving layer.
Moreover, the container with a label which affixed these labels is also included. Furthermore, the manufacturing method of these labels and labeled containers is also included.

That is, the present invention relates to the following (1) to (18).
(1) A transparent film having a printing surface including at least one of high-intensity gold printing and silver printing having metallic luster, an adhesive layer on the printing surface side of the transparent film, a thermoplastic resin base material layer, An in-mold label that includes a heat seal layer in this order.
(2) A thermoplastic resin base layer having a printing surface including at least one of high-luminance gold printing and silver printing having a metallic luster, and an adhesive layer and a transparent on the printing surface side of the thermoplastic resin base layer The label for in-mold shaping | molding which contains a film in this order and contains a heat seal layer in the surface side opposite to the printing surface of this thermoplastic resin base material layer.
(3) The transparent film contains at least one selected from polyethylene, polypropylene, polyethylene terephthalate, polystyrene, and polyvinyl chloride, and has a haze value of 0 to 20% as described in (1) or (2) above Label for in-mold molding.
(4) The above (1) or (2), wherein at least one of high-intensity gold printing and silver printing having a metallic luster is printed by at least one method selected from gravure printing, flexographic printing, screen printing, and offset printing. ) Label for in-mold molding.
(5) A transparent film having a printing surface including at least one of high-luminance gold printing and silver printing having a metallic luster, an adhesive layer on the printing surface side of the transparent film, and a thermoplastic resin substrate layer, Cold glue label including a cold glue receiving layer in this order.
(6) A thermoplastic resin substrate layer having a printing surface including at least one of high-luminance gold printing and silver printing having a metallic luster, and an adhesive layer and a transparent on the printing surface side of the thermoplastic resin substrate layer A cold glue label comprising a film in this order and a cold glue receiving layer on the side of the thermoplastic resin substrate layer opposite to the printed surface.

(7) The transparent film contains at least one selected from polyethylene, polypropylene, polyethylene terephthalate, polystyrene, and polyvinyl chloride, and has a haze value of 0 to 20% as described in (5) or (6) above. Cold glue label.
(8) The above (5) or (6), wherein at least one of high-intensity gold printing and silver printing having a metallic luster is printed by at least one method selected from gravure printing, flexographic printing, screen printing, and offset printing. ) Cold glue label.
(9) A labeled container having the in-mold forming label according to (1) or (2).
(10) A labeled container having the cold glue label according to (5) or (6).
(11) After forming a printing surface including at least one of high-intensity gold printing and silver printing with metallic luster on one side of the transparent film and providing a heat seal layer on one side of the thermoplastic resin base material layer The manufacturing method of the label for in-mold shaping | molding including joining the printing surface side of a transparent film, and a thermoplastic resin layer through an adhesive bond layer.
(12) After providing a heat seal layer on one side of the thermoplastic resin substrate layer, high-luminance gold printing having a metallic luster on the surface opposite to the surface of the thermoplastic resin substrate layer on which the heat seal layer is provided; The manufacturing method of the label for in-mold shaping | molding including forming the printing surface containing at least 1 of silver printing, and laminating | stacking a transparent film on the printing surface side of this thermoplastic resin base material layer through an adhesive bond layer.

(13) After forming a printing surface including at least one of high-intensity gold printing and silver printing with metallic luster on one side of the transparent film and providing a cold glue receiving layer on one side of the thermoplastic resin base material layer The manufacturing method of the label for cold glue including joining the printing surface side of a transparent film, and a thermoplastic resin layer through an adhesive bond layer.
(14) After providing a cold glue receiving layer on one side of the thermoplastic resin base material layer, high brightness gold having a metallic luster on the surface opposite to the surface of the thermoplastic resin base material layer provided with the cold glue receiving layer The manufacturing method of the label for cold glue including forming the printing surface containing at least one of printing and silver printing, and laminating | stacking a transparent film on the printing surface side of this thermoplastic resin base material layer through an adhesive bond layer.
(15) A method for producing a labeled container, comprising attaching the in-mold forming label according to (1) or (2).
(16) A method for producing a labeled container, comprising attaching the cold glue label according to (5) or (6).
(17) The method for producing a labeled container according to (15), wherein the in-mold molding label is attached by injection molding or hollow molding.
(18) The above-described (16), wherein the cold glue label is attached by applying an aqueous glue to the cold glue receiving layer of the cold glue label with an automatic labeler and attaching the cold glue to the container via the aqueous glue. The manufacturing method of the container with a label as described in.

  According to the present invention, a high-luminance appearance having a high gloss and a metallic luster derived from printing, a label for in-mold molding, or a label for cold glue, which does not damage the printed surface by the contents and in-mold molding, The container which stuck the label, and these manufacturing methods can be provided.

Below, the label of this invention is demonstrated in detail. In the present specification, a numerical range represented by using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.
1-4 is a schematic diagram of a part of an embodiment of the present invention, and FIGS. 5 to 7 are schematic diagrams of a part of embodiments of Comparative Examples 1 to 3 as conventional examples. In the figure, 1 is a transparent film, 2 is gold and / or silver printing with metallic luster, 3 is other printing, 4 is an adhesive layer, 5 is a heat seal layer, 6 is a thermoplastic resin substrate layer, 7 is Cold glue receiving layer, 8 is a gold foil, 9 is a varnish, 10 is a label for in-mold molding, and 11 is a label for cold glue.

<Transparent film>
The transparent film used in the present invention has a role of firmly protecting a printed surface including a high gloss appearance and high brightness printing as an inner layer of the transparent film from external force such as contents and friction. If this material is opaque, the brightness of the printed surface as the inner layer cannot be sufficiently developed, and the glossiness of the surface tends to be lowered.
As a transparent film used by this invention, it is preferable that the haze value by JIS-K-7105 is 0-20%, It is more preferable that it is 0-15%, It is especially preferable that it is 0-10%. If the haze value exceeds 20%, the transparency of the film decreases, and the brightness of the gold and / or silver ink decreases. As a material for the transparent film, preferably, at least one selected from polyethylene, polypropylene, polyethylene terephthalate, polystyrene, and polyvinyl chloride can be used. These films may not be stretched and may be stretched uniaxially or biaxially. The thickness of the film is preferably 10 to 200 μm. If the thickness is less than 10 μm, misregistration of printing is likely to occur due to the tension during gravure or flexographic printing, and wrinkles tend to occur during bonding using an adhesive, resulting in a significant increase in loss. On the other hand, when the thickness exceeds 200 μm, the rigidity of the label becomes too high, and when the label is fixed in advance in the mold by suction or the like during in-mold molding, it does not follow the curvature of the mold and easily falls from the mold. Further, when cold glue labeling is performed, it is not preferable because it does not follow the curvature of the bottle and tends to float after sticking.

<Printing ink>
The high-intensity gold ink and / or silver ink used in the present invention easily imparts a high design property with a metallic luster appearance to a label by printing or coating.
Here, “high brightness” in the present invention is a range in which the glossiness (measurement angle: 75 °) of the high-brightness ink printed portion of the label measured in accordance with JIS-P-8142 is in the range of 90 to 140%, Preferably, it is in the range of 100 to 130%.
When the glossiness is less than 90%, the printed portion is dull and the desired metallic gloss cannot be obtained.

The ink used for high brightness gold and / or silver printing with metallic luster used in the present invention is preferably a metal powder such as aluminum paste or bronze powder, or a pearl pigment mainly composed of mica powder, etc. Although the metallic ink can be used, the high-intensity coating agent mainly composed of a thin metal thin film and made of a binder resin or the like, which is described in detail in Patent Document 5, is particularly preferable. As a specific example of such a high brightness coating agent, “Fine Wrap Super Metallic” manufactured by Dainippon Ink & Chemicals, Inc. can be used.
The conventional metallic ink has a metallic luster by blending metal fine powder, but it has a strong tendency to have a slightly matte appearance with a particle feeling due to irregular reflection on the surface of the fine powder. Separately from this, foil stamping and vapor deposition methods are used to obtain an appearance with a metallic luster with no particle feeling, such as a mirror surface or a polished metal surface, but it is less productive and expensive than printing. Yes, the degree of freedom of expression is limited.

The above high-brightness coating agent has a high-brightness and particle-free metallic luster appearance almost equal to that of metal foil or metal vapor deposition, by the printing technique, by orienting the metal thin film dispersed in the coating agent in the plane direction. It is preferable because it can be obtained.
As a printing method using these inks, one of the great features of the present invention is that a printing method such as gravure printing, flexographic printing, screen printing, or offset printing can be used. If the printing surface is formed by the printing method, it is possible to create a partial metallic gloss layer region in which an arbitrary pattern is formed not only on the entire surface of the label but also at an arbitrary position on the label. In the case of performing gravure printing, it is also possible to create a gradation in which a continuous gradation is given to the light reflectance of the metallic gloss layer region. In addition to these, the ink printing surface can be formed by coating. Examples of the ink coating method include ordinary coating methods such as roll coating, gravure coating, curtain coating, spray coating, and die coating.
The label of the present invention efficiently reflects light on a gold printing surface and / or silver printing surface in addition to light reflection on the transparent film surface, and thus has a high glossiness, thereby achieving high brightness.

<Adhesive layer>
The adhesive layer of this invention joins the above-mentioned transparent film and the thermoplastic resin base material layer mentioned later. It is also in direct contact with the printing surface.
As the adhesive used in the present invention, any of a hot melt system, a solvent system, an aqueous system, and a solventless system can be used. Regarding the lamination method, any of dry lamination, wet lamination, hot melt lamination, heat lamination, extrusion lamination, and print lamination can be employed. Among these, the dry laminating method and the hot melt laminating method are particularly preferable because of high adhesive strength.
Preferable examples of the adhesive component include acrylic, polyester, vinyl acetate, EVA, and urethane. 0.1-20 micrometers is preferable and, as for the thickness of an adhesive bond layer, 0.5-10 micrometers is more preferable. If it is less than 0.1 μm, the adhesive strength is low, and it is easy to peel off between the transparent film and thermoplastic resin substrate layers when used for end-user punching and in-mold molding, high-speed labeling of glue labels, and end users. . If it exceeds 20 μm, the adhesive strength will reach a peak and only the cost will increase. In the case of a solvent-based adhesive, drying is delayed and the residual solvent increases, which is not preferable.

<Thermoplastic resin base material layer>
The thermoplastic resin base material layer of the present invention is in the form of sandwiching the above-mentioned printing surface together with the above-mentioned transparent film. The base material layer has a role of firmly protecting the printing surface including high-luminance printing, which is an inner layer of the thermoplastic resin base material layer, from the molten resin that is a base of the container, particularly in an in-mold molding label.
Examples of the material constituting the thermoplastic resin base material layer include polyethylene resins such as propylene resin, high density polyethylene and medium density polyethylene, and polyolefin resins such as polymethyl-1-pentene and ethylene-cyclic olefin copolymer. Polyethylene terephthalate resin, polyvinyl chloride resin, nylon-6, nylon-6,6, nylon-6,10, nylon-6,12 and other polyamide resins, ABS resin, ionomer resin, etc. Can be mentioned. These resins may be used alone or in combination of two or more.

Among these, a thermoplastic resin having a melting point in the range of 130 to 280 ° C. such as propylene-based resin, high-density polyethylene, and polyethylene terephthalate resin is preferable. Among resins satisfying such conditions, a propylene resin is particularly preferable from the viewpoint of chemical resistance and cost. Such propylene resins include propylene homopolymers exhibiting isotactic or syndiotactic stereoregularity, propylene, ethylene, 1-butene, 1-hexene, 1-heptene, 4-methyl-1-pentene. And a copolymer with an α-olefin. These copolymers may be binary, ternary or quaternary, and may be random copolymers or block copolymers.
Moreover, an inorganic fine powder or an organic fine powder can be suitably blended with the above thermoplastic resin. Examples of the inorganic fine powder include heavy calcium carbonate, light calcium carbonate, calcined clay, talc, barium sulfate, diatomaceous earth, magnesium oxide, zinc oxide, titanium oxide, silicon oxide and the like. Among them, heavy calcium carbonate, calcined clay, and talc are preferable because they are inexpensive and have good moldability.

  For the purpose of pore formation, the organic fine powder should be selected from resins that have a melting point or glass transition point higher than that of the thermoplastic resin used in the base material layer and are incompatible. Is preferred. Specific examples include polyethylene terephthalate, polybutylene terephthalate, polyamide, polycarbonate, polyethylene naphthalate, polystyrene, acrylic acid ester or methacrylic acid ester polymer or copolymer, melamine resin, polyethylene sulfite, polyimide, polyethyl ether ketone, Examples thereof include polyphenylene sulfide, a homopolymer of cyclic olefin, and a copolymer (COC) of cyclic olefin and ethylene. In particular, when a polyolefin resin is used as the thermoplastic resin, polyethylene terephthalate, polybutylene terephthalate, polyamide, polycarbonate, polyethylene naphthalate, polystyrene, a homopolymer of cyclic olefin, and a copolymer of cyclic olefin and ethylene can be used. It is preferable to select from a polymer (COC) for use.

One kind of the fine powder may be used alone, or two or more kinds may be selected and used in combination. When using in combination of 2 or more types, you may mix and use an inorganic fine powder and an organic fine powder. Furthermore, a dispersant, an antioxidant, a compatibilizer, an ultraviolet stabilizer, an antiblocking agent, and the like can be added as necessary.
The thermoplastic resin substrate layer may be a single layer or multiple layers. In the case of multiple layers, the core layer has a structure in which a front surface layer and a back surface layer are disposed on both sides thereof, and each layer may be composed of the same thermoplastic resin or different types of thermoplastic resins. May be. Moreover, when mix | blending inorganic or organic fine powder with these, those types and compounding quantities may be the same, or may differ. Further, the thermoplastic resin base material layer can be preferably used regardless of whether it is stretched or not.

The thermoplastic resin substrate layer may be transparent or opaque. If it is transparent, the base of the container can be visually recognized through the transparent portion of the entire label layer, and the sense of unity between the label and the container increases. If it is opaque, the label information can be read more clearly. As a method for obtaining an opaque material, the above-mentioned inorganic fine powder and / or organic fine powder is contained as a filler, and pores are formed around the filler by further stretching the filler-containing resin film. And a method of further providing a concealing layer on the thermoplastic resin substrate layer are known.
The thickness of these thermoplastic resin films is 10 to 200 μm, preferably 20 to 100 μm. When the thickness is less than 10 μm, the effect of providing the thermoplastic resin base material layer cannot be sufficiently obtained. If it exceeds 200 μm, the rigidity of the label is too high and problems such as the label floating from the container are likely to occur. Also, there is a tendency to drop from the mold during in-mold molding.

<Heat seal layer>
The heat seal layer used for the label for in-mold molding of the present invention is provided on the opposite surface of the surface on which the transparent film is laminated on the thermoplastic resin base material layer. And in in-mold shaping | molding, it activates with the heat | fever of the molten resin used as the material of a container, and a label and a container are joined.
The heat seal layer is made of a resin, and any resin can be used as long as it has a function of sticking to a resin material constituting a container for sticking a label by heating during in-mold molding. Preferred examples of the resin include low density or medium density high-pressure polyethylene of a density of 0.900~0.935g / cm ^3, straight-chain linear polyethylene of density 0.880~0.940g / cm ^3, ethylene Vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / acrylic acid alkyl ester copolymer, ethylene / methacrylic acid alkyl ester copolymer (alkyl group having 1 to 8 carbon atoms), ethylene / methacrylic acid copolymer Examples thereof include polyethylene resins having a melting point of 60 to 130 ° C. such as polymer metal salts (Zn, Al, Li, K, Na, etc.).

Among these, high pressure polyethylene having a density of 10 to 60% and a number average molecular weight of 10,000 to 40,000, or linear linear polyethylene is preferable at the above density. Among these, from the viewpoint of adhesiveness to a resin molded product, 40 to 98% by weight of ethylene and 60 to 2% by weight of α-olefin having 3 to 30 carbon atoms are converted into a metallocene catalyst (particularly a metallocene / alumoxane catalyst or, for example, International Publication No. 92/01723 pamphlet and the like, and a catalyst comprising a metallocene compound and a compound that reacts with the metallocene compound to form a stable anion. Low density polyethylene is particularly preferred.
These polyolefin resin may be used individually by 1 type, and may mix and use 2 or more types. Other known additives for resin can be arbitrarily added to the heat seal layer as long as the required performance is not impaired. Examples of such additives include dyes, nucleating agents, plasticizers, mold release agents, antioxidants, antiblocking agents, flame retardants, and ultraviolet absorbers.

In the heat seal layer, the resin material constituting the heat seal layer may be provided on one side of the thermoplastic resin base material layer by extrusion lamination, or may be provided by coextrusion at the time of molding the thermoplastic resin base material layer. . Alternatively, a resin solution dissolved in a solvent such as toluene or ethyl cellosolv, or an emulsion-like water dispersion solution may be applied to one side of the thermoplastic resin substrate layer and dried.
The thickness of these heat seal layers is preferably 1 to 100 μm, and more preferably 2 to 30 μm. When the thickness is less than 1 μm, the adhesive strength to the container cannot be sufficiently exerted, and the label tends to partially lift. If it exceeds 100 μm, the rigidity of the label is too high, and problems such as the label floating from the container are likely to occur. Also, there is a tendency to drop from the mold during in-mold molding.

<Cold glue receiving layer>
The cold glue receiving layer used for the cold glue label of the present invention is provided on the opposite side of the surface of the thermoplastic resin substrate layer on which the transparent film is laminated. As these cold glue receiving layers, commercially available starch glue, casein glue, synthetic glue or the like can be applied with an automatic labeler, and any layer can be preferably used as long as it can be stuck continuously to a bottle. Specifically, a method in which calcium carbonate or kaolin clay is water-solubilized with a binder such as latex and coated and dried, a thermoplastic resin such as polyolefin is filled with a specific inorganic fine powder, and unidirectional or A method of providing pores by stretching in two directions and providing a layer on which the above paste can be applied and dried (see JP-A-2001-164017 and JP-A-2004-68017); Any method can be used, such as a method of bonding things.

<Manufacturing method of labeled container>
The manufacturing method of the labeled container in the present invention is not particularly limited, and a conventionally used molding method can be appropriately used for in-mold molding labels and cold glue labels.
In particular, in the case of an in-mold molding label, the label is set so as to be in contact with the mold wall surface in advance, and hollow molding (blow molding) for guiding a molten thermoplastic resin parison into the mold is performed. Preferred examples include injection molding (injection molding) used, vacuum molding or pressure molding using a molten thermoplastic resin sheet, and the like. Here, injection molding and hollow molding are particularly preferable.
In the case of a cold glue label, a preferred example is a method in which an automatic labeler is used to apply a water-based glue on the cold glue receiving layer of the label and attach it to a container as a series of operations.

The present invention will be described more specifically with reference to examples and comparative examples below, but the present invention is not limited to these examples.
The materials, amounts used, ratios, processing details, processing procedures, and the like shown in the following examples can be changed as appropriate without departing from the spirit of the present invention.
<Example 1>
<Adjustment of high-brightness coating agent> of the embodiment of Patent Document 5 described above as a high-brightness silver ink having a metallic luster on one side of a commercially available biaxially stretched polypropylene film (thickness 30 μm, haze 3%) as a transparent film Using the high-intensity coating agent prepared by the method described in 1), reverse printing was performed by a gravure printing method. Reverse printing is a method of printing a mirror image in advance so that information can be correctly visually recognized when the printed surface is viewed through a transparent film.
As a thermoplastic resin base material layer, an in-mold label base paper (opacity of 94% according to JIS-Z-8722) described in Example 1 of JP-A No. 09-207166 was prepared. This has a heat seal layer on one surface of a thermoplastic resin base material layer. A two-component modified acrylic adhesive (trade name “AP368”, manufactured by Chuo Rika Kogyo Co., Ltd.) is applied to the surface of the in-mold label base paper on the side of the thermoplastic resin substrate layer, and dried to be an adhesive. Layers were laminated and laminated by a dry laminating method so that the adhesive layer and the printed surface of the transparent film were in contact with each other. As a result, an opaque label for in-mold molding having a laminated structure of transparent film / printing layer / adhesive layer / thermoplastic resin substrate layer / heat seal layer was obtained. A schematic cross-sectional view of the obtained in-mold molding label is shown in FIG.

This was punched into a predetermined label form and used for blow molding. Insert the label into one of the molds (split molds) equipped with Plako's blow molding machine using a machine mate labeler, and suction from the mold side so that the transparent film side contacts the mold Fixed to. Thereafter, a parison of high-density polyethylene (melting point: 134 ° C.) is melt-extruded at 200 ° C., and then the mold is clamped. Then, 4.2 kgf / cm ² of compressed air is supplied into the parison and expanded to form a container. The label was fused to the container to obtain a container with a label with high brightness and clear printing.
In addition, injection molding was also performed using the punched label. After the label was manually inserted into a mold having a product shape of 130 mm × 150 mm provided in an injection molding machine manufactured by Niigata Steel, the mold was clamped, and polypropylene melted at 230 ° C. (melting point: 160 ° C.) An injection pressure was 750 kgf / cm ^{2 in the} mold, and the label was fused to a molten resin as a container to obtain a labeled container with high brightness and clear printing.

When the state of the labeled container of Example 1 was evaluated from the appearance, it was the same as before being fused to the container, and a bright and clear printed appearance was maintained.
Further, as a test for resistance to contents and scratch resistance of the container of Example 1, after impregnating a stock solution of a commercially available shampoo (manufactured by Kao Corporation: Merit) at 40 ° C. for 24 hours, Cellotape (Nichiban Co., Ltd.) When the ink was peeled off from the surface, no ink was dropped off. Similarly, no ink was dropped even when rubbed with a nail.
Here, the glossiness of the printed portion of the label of Example 1 was measured at a measurement angle of 75 ° using a digital variable angle glossiness meter manufactured by Suga Test Instruments based on JIS-P-8142. Was 120%.

<Example 2>
According to the same procedure as in Example 1, a transparent film on which high-intensity silver ink was reversely printed was prepared. Separately, a commercially available 80 μm-thick unstretched polypropylene film (5% haze) was prepared as a thermoplastic resin film, and an extrusion laminator in which EVA (ethylene vinyl acetate copolymer) having a melting point of 86 ° C. was set at 250 ° C. on one side. In use, extrusion lamination with a thickness of 30 μm was performed to provide a heat seal layer. Next, the printed surface of the transparent film and the unstretched polypropylene film were bonded together by a hot melt laminating method using a urethane moisture-curable hot melt adhesive. As a result, a transparent label for in-mold molding having a laminated structure of transparent film / printing layer / adhesive layer / thermoplastic resin substrate layer / heat seal layer and subjected to high brightness printing was obtained. A schematic cross-sectional view of the obtained in-mold molding label is shown in FIG. This was fused with a blow container and an injection container in the same manner as in Example 1 to obtain a labeled container on which bright and clear printing was performed.
When the appearance evaluation, content resistance and scratch resistance test were conducted in the same manner as in Example 1, the results were the same as in Example 1.
Moreover, when the glossiness of the printed part of the label of Example 2 was measured by the same method as in Example 1, the glossiness was 120%.

<Example 3>
On the surface of the in-mold label base paper (opacity 94% according to JIS-Z-8722) described in Example 1 of JP-A-9-207166 on the side of the thermoplastic resin substrate layer, the same high level as Example 1 of the present application is applied. Gravure printing was performed using a bright silver ink. Further, a urethane-based moisture-curable hot melt adhesive was applied on the printed surface, and a biaxially stretched polypropylene film (having 3%) having a thickness of 30 μm was bonded thereto. As a result, an opaque in-mold molding label having a laminated structure of transparent film / adhesive layer / printing layer / thermoplastic resin substrate layer / heat seal layer was obtained. A schematic cross-sectional view of the obtained in-mold molding label is shown in FIG. The label was fused to the blow container and the injection container in the same manner as in Example 1 to obtain a labeled container on which bright and clear printing was performed.
When the appearance evaluation, content resistance and scratch resistance test were conducted in the same manner as in Example 1, the results were the same as in Example 1.
Further, the glossiness of the printed portion of the label of Example 3 was measured by the same method as in Example 1, and the glossiness was 105%.

<Example 4>
Reverse printing was performed on one side of a 30 μm-thick biaxially stretched polypropylene film (haze 3%) by the same procedure as in Example 1. Separately, cold glue label base paper (97% opacity according to JIS-Z-8722) having water absorption described in JP-A-2004-68017 is prepared, and urethane-based moisture curing is applied to the surface of the thermoplastic resin substrate layer side. A mold hot melt adhesive was applied, an adhesive layer was provided, and then bonded to the printed surface. As a result, an opaque cold glue label on which high brightness printing was performed was obtained. FIG. 3 shows a schematic cross-sectional view of the obtained cold glue label. After punching this into a predetermined shape, starch glue (Tokiwanol 650WR, Tokiwa Chemical Co., Ltd.) is applied to the cold glue receiving layer using an automatic glue labeler (LNS type) manufactured by Koyo Automatic Co. The container was attached to a bottle to obtain a labeled container on which bright and clear printing was performed.
When the appearance evaluation, content resistance and scratch resistance test were conducted in the same manner as in Example 1, the results were the same as in Example 1.
Moreover, when the glossiness of the printed part of the label of Example 4 was measured by the same method as in Example 1, the glossiness was 120%.

<Example 5>
The surface of the cold glue label base paper having the water absorption described in JP-A-2004-68017 (opacity of 97% according to JIS-Z-8722) on the side of the thermoplastic resin substrate layer is the same as that of Example 1 of the present application. Gravure printing was performed using a bright silver ink. Further, a urethane-based moisture-curable hot melt adhesive was applied on the printed surface, and a biaxially stretched polypropylene film (having 3%) having a thickness of 30 μm was bonded thereto. As a result, an opaque cold glue label on which high brightness printing was performed was obtained. A schematic cross-sectional view of the obtained cold glue label is shown in FIG. This was attached to a glass bottle in the same manner as in Example 4 to obtain a labeled container on which high-intensity and clear printing was performed.
When the appearance evaluation, content resistance and scratch resistance test were conducted in the same manner as in Example 1, the results were the same as in Example 1.
Further, the glossiness of the printed portion of the label of Example 5 was measured by the same method as in Example 1, and the glossiness was 105%.

<Comparative Example 1>
In the same manner as in Example 3, gravure printing is performed on the surface of the in-mold label base paper (opacity 94% according to JIS-Z-8722) described in the example of Japanese Patent Application Laid-Open No. 09-207166 on the thermoplastic resin base layer side. In addition, a golden foil was pressed by a hot stamping method to obtain a label for in-mold molding. FIG. 5 shows a schematic cross-sectional view of the obtained in-mold molding label. The label was fused to the container in the same manner as in Example 1 to obtain a labeled container.
In this product, the brightness of the printed and foiled part was clear, but the same part was present in the outermost layer, so that it became a labeled container having poor content resistance and scratch resistance.
In addition, when the glossiness of the printing part of the label of the comparative example 1 was measured by the method similar to Example 1, the glossiness was 100%.

<Comparative Example 2>
In the same manner as in Example 3, gravure printing is performed on the surface of the in-mold label base paper (opacity 94% according to JIS-Z-8722) described in the example of Japanese Patent Application Laid-Open No. 09-207166 on the thermoplastic resin substrate layer side. In addition, a golden foil was pressed by a hot stamping method to obtain a label for in-mold molding.
Furthermore, using a bar coater on the surface of this, a UV curable varnish (manufactured by T & K TOKA) was applied at 4 g / m ² and cured by UV irradiation to form an in-mold molding label having a protective layer of varnish. Obtained. A schematic cross-sectional view of the obtained in-mold molding label is shown in FIG. The label was fused to the container in the same manner as in Example 1 to obtain a labeled container.
However, the obtained container was a resin container with a label where the printed and foiled portions had low brightness and the sharpness was poor.
In addition, when the glossiness of the printing part of the label of the comparative example 2 was measured by the method similar to Example 1, the glossiness was 85%.

<Comparative Example 3>
An in-mold label described in Example 1 of Patent Document 5 was prepared. A schematic cross-sectional view of the label is shown in FIG. This label was fused to the container in the same manner as in Example 1 to obtain a labeled container. However, in the container obtained by injection molding, the ink flows together with the heat seal layer due to the pressure of the molten resin at the time of injection, and not only high-intensity printing but also most of the normal printing portion disappeared.
In addition, when the glossiness of the printing part of the label of the comparative example 3 was measured by the method similar to Example 1, the glossiness was 85%.

FIG. 1 is a diagram showing an outline of a cross-sectional structure of an in-mold label according to Example 1 and Example 2 of the present invention. FIG. 2 is a diagram showing an outline of a cross-sectional structure of the in-mold molding label of Example 3 of the present invention. FIG. 3 is a diagram showing an outline of a cross-sectional structure of a cold glue label according to the fourth embodiment of the present invention. FIG. 4 is a diagram showing an outline of a cross-sectional structure of a cold glue label according to the fifth embodiment of the present invention. FIG. 5 is a view showing an outline of a cross-sectional structure of the in-mold molding label of Comparative Example 1 of the present invention. FIG. 6 is a diagram showing an outline of a cross-sectional structure of the in-mold molding label of Comparative Example 2 of the present invention. FIG. 7 is a diagram showing an outline of a cross-sectional structure of the in-mold molding label of Comparative Example 3 of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transparent film 2 High brightness gold and / or silver printing with metallic luster 3 Other printing 4 Adhesive layer 5 Heat seal layer 6 Thermoplastic resin base material layer 7 Cold glue receiving layer 8 Gold foil 9 Varnish 10 For in-mold molding Label 11 Cold glue label

Claims (18)

  A transparent film having a printing surface including at least one of high-intensity gold printing and silver printing having metallic luster, an adhesive layer on the printing surface side of the transparent film, a thermoplastic resin base material layer, and a heat seal layer A label for in-mold molding characterized by comprising   A thermoplastic resin substrate layer having a printing surface including at least one of high-luminance gold printing and silver printing having metallic luster, and an adhesive layer and a transparent film on the printing surface side of the thermoplastic resin substrate layer An in-mold molding label comprising a heat seal layer on the surface of the thermoplastic resin substrate layer opposite to the printed surface.   The transparent film contains at least one selected from polyethylene, polypropylene, polyethylene terephthalate, polystyrene, and polyvinyl chloride, and has a haze value of 0 to 20%. Label for molding.   3. At least one of high-intensity gold printing and silver printing having a metallic luster is printed by at least one method selected from gravure printing, flexographic printing, screen printing, and offset printing. A label for in-mold molding described in 1.   A transparent film having a printing surface including at least one of high-intensity gold printing and silver printing having a metallic luster, an adhesive layer on the printing surface side of the transparent film, a thermoplastic resin base material layer, and cold glue reception Cold glue label comprising layers in this order.   A thermoplastic resin substrate layer having a printing surface including at least one of high-luminance gold printing and silver printing having metallic luster, and an adhesive layer and a transparent film on the printing surface side of the thermoplastic resin substrate layer A cold glue label including a cold glue receiving layer on the surface opposite to the printed surface of the thermoplastic resin base material layer in this order.   The cold film according to claim 5 or 6, wherein the transparent film contains at least one selected from polyethylene, polypropylene, polyethylene terephthalate, polystyrene, and polyvinyl chloride, and has a haze value of 0 to 20%. Glue label.   The at least one of high-intensity gold printing and silver printing with metallic luster is printed by at least one method selected from gravure printing, flexographic printing, screen printing, and offset printing. Cold glue label as described in.   A labeled container having the in-mold forming label according to claim 1.   A labeled container having the cold glue label according to claim 5.   An adhesive layer is formed after forming a printing surface including at least one of high-intensity gold printing and silver printing with metallic luster on one side of the transparent film and providing a heat seal layer on one side of the thermoplastic resin base material layer The manufacturing method of the label for in-mold shaping | molding including joining the printing surface side of a transparent film, and a thermoplastic resin layer through this.   After providing a heat seal layer on one side of the thermoplastic resin substrate layer, the surface of the thermoplastic resin substrate layer opposite to the surface on which the heat seal layer is provided is used for high brightness gold printing and silver printing. Forming a printing surface including at least one, and laminating a transparent film via an adhesive layer on the printing surface side of the thermoplastic resin base material layer. .   Forming a printing surface including at least one of high-intensity gold printing and silver printing with metallic luster on one side of a transparent film, and providing a cold glue receiving layer on one side of the thermoplastic resin base layer, an adhesive A method for producing a label for cold glue, comprising joining a printing surface side of a transparent film and a thermoplastic resin layer through a layer.   After providing a cold glue receiving layer on one side of the thermoplastic resin substrate layer, high brightness gold printing and silver having a metallic luster on the surface opposite to the surface of the thermoplastic resin substrate layer provided with the cold glue receiving layer Manufacturing a cold glue label comprising forming a printing surface including at least one of printing and laminating a transparent film via an adhesive layer on the printing surface side of the thermoplastic resin base material layer Method.   A method for producing a labeled container, comprising sticking the in-mold forming label according to claim 1.   A method for producing a labeled container, comprising sticking the cold glue label according to claim 5.   The method for producing a labeled container according to claim 15, wherein the in-mold molding label is attached by injection molding or hollow molding.   The cold glue label is attached by applying an aqueous glue to the cold glue receiving layer of the cold glue label with an automatic labeler and attaching the cold glue to the container via the aqueous glue. The manufacturing method of the labeled container of 16.

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