CN1866321A - High brightness tag, container stuck by the tag, and its production method - Google Patents

Abstract

The present invention provides a label for in-mold molding or a label for cold glue, and a container on which the label is attached, and the label has a high-brightness appearance with excellent metallic luster, and is resistant to contents. The label of the present invention contains a transparent film with a printing surface, and an adhesive layer, a thermoplastic resin substrate layer, and a heat seal layer/cold glue receiving layer are sequentially included on the printing surface side of the transparent film; or a thermoplastic resin film with a printing surface. A resin substrate layer, which sequentially contains an adhesive layer and a transparent film on the side of the printing surface of the thermoplastic resin substrate layer, and which contains a heat-sealing layer/cooling layer on the side of the thermoplastic resin substrate layer opposite to the printing surface. In the glue-receiving layer, the printing surface contains at least one of high-brightness gold printing and silver printing with metallic luster. The present invention also provides a manufacturing method of the above-mentioned label and container.

Description

High-brightness label, container with the label, and manufacturing method thereof

technical field

The present invention relates to a label and a container affixed with the label. The label includes a label for in-mold molding or a label for cold glue. The parison is introduced into the mold for hollow molding, or the molten thermoplastic resin is injection molded, or the molten thermoplastic resin sheet is vacuum formed or pressure formed, thereby manufacturing a resin molded product with a label; for the cold glue label , is a label that mainly uses water-based paste and is attached to a bottle made of glass, metal, pottery, polyolefin, polyethylene terephthalate (hereinafter referred to as "PET") by a high-speed labeling device. Bottles formed of other plastics. Further, the present invention relates to a method of manufacturing the label and a method of manufacturing the container with the label.

Background technique

Some labels described in Patent Document 1, Patent Document 2, etc. are known as labels used in the in-mold molding method, which is as follows: after the label is installed in the mold in advance, a thermoplastic resin is injected Inside the mold, the container is molded by injection molding, hollow molding, differential pressure molding, foam molding, etc., and the label is attached to the container at the same time.

In addition, labels for cold glue are required to have good absorbability to water (the water is the solvent of the aqueous paste), and some such labels have been proposed so far, such as Patent Document 3 and Patent Document 4.

[Patent Document 1] JP-A-58-069015

[Patent Document 2] Japanese Unexamined Patent Publication No. 01-125225

[Patent Document 3] JP-A-10-212367

[Patent Document 4] JP-A-10-254362

For such labels, demands for labels having a thermoplastic resin film as a base layer have increased in consideration of water resistance, strength, mildew resistance, and the like. In addition, it is determined by the market that labels should have a gold or silver high-brightness texture (metallic luster, metallic feel) and a high surface gloss in terms of appearance. In addition, although these labels are pasted on containers for use, in addition to the increased requirements for the appearance of the labels, the following requirements have also been increased: various beverages, oils, detergents, shampoos, etc. are removed from the container. Spilling, or rubbing the label vigorously will not remove the above design, trademark or cautionary information provided on the label.

In the past, in order to obtain this kind of label, generally, after printing directly on the surface of the label with a high-brightness gold ink and/or silver ink with metallic luster, or after setting a prescribed pattern by pressing foil, the surface of the label is printed with a thickness of 1 μm to 10 μm. The thickness of ultraviolet (UV) curable varnish is applied and dried to form a protective film. However, when using this method, there is a disadvantage that a high-gloss appearance cannot be obtained due to the varnish. In addition, there was a problem that the print and the peeling off of the foil when the contents of the container were spilled could not be sufficiently solved.

As a solution to this problem, Patent Document 5 proposes an in-mold label formed by coating or printing a high-brightness coating agent and ordinary ink on one side of a transparent film, and directly coating an in-mold adhesive thereon. Label. For this in-mold label, the printed surface of the high-gloss coating agent is protected by a transparent film, and the label also has a high-gloss appearance. However, for this label, since the adhesive is directly placed on the printing surface, when performing, for example, in-mold injection molding (injection molding), the ink is likely to flow due to the injected high-pressure molten resin, and there is not only the intended high-brightness printing part. Disappear and make the usual printed parts disappear too. In addition, when in-mold blow molding (blow molding) is performed, due to the heat and pressure of the molten resin, the orientation of the metal thin film flakes in the high-brightness coating agent is disordered, and finally the desired metallic luster cannot be obtained, resulting in appearance. uneven problem.

[Patent Document 5] JP-A-2002-196675

As a method of imparting a high-brightness texture (metallic luster, metallic feel) to the label in consideration of the appearance as well, there is a method of obtaining a high-brightness appearance by metal vapor deposition. However, this method requires a dedicated device, so the process is complicated, and there are problems of low productivity and high production cost, so it cannot be widely used.

Contents of the invention

Therefore, an object of the present invention is to provide a label, a container with the label, a method for manufacturing the label, and a method for manufacturing the container, the label including a label for in-mold molding or a label for cold glue, the label A high-gloss label with a thermoplastic resin film as the base layer has a printing surface, which is obtained by printing with high-gloss gold ink and/or silver ink with metallic luster, wherein the printing surface is not affected by The above-mentioned damage to the contents, and when it is pasted on the container, the printed surface will not be damaged by molten resin or the like.

The inventors of the present invention have conducted intensive research and found that, when the following in-mold molding label is manufactured, a label satisfying both the above-mentioned high-brightness and high-gloss appearance and content resistance-processing resistance can be obtained, thereby completing the present invention. The label for in-mold molding is a label for in-mold molding in which a printing surface is formed on one side of a transparent film, and an adhesive layer, a thermoplastic resin substrate layer, and a heat-sealing layer are sequentially laminated on the printing surface; In-mold molding in which a printed surface is formed on one side of a resin substrate layer, a transparent film is laminated on the printed surface through an adhesive layer, and a heat-sealing layer is laminated on the opposite side of the thermoplastic resin substrate layer from the printed surface Labels, the printed side containing high-brightness gold and/or silver printing with a metallic luster.

The transparent film used in the present invention contains at least one selected from polyethylene, polypropylene, polyethylene terephthalate, polystyrene, and polyvinyl chloride, and its haze value is preferably 0% to 20%. .

In addition, the high-brightness gold and/or silver printing having a metallic luster is preferably provided by at least one method selected from gravure printing, flexographic printing, and screen printing.

Furthermore, the present invention includes labels in the form of labels for cold glue in which the heat-sealing layer of the label for in-mold molding is changed to a cold glue receiving layer.

Furthermore, the present invention also includes labeled containers having these labels attached thereto.

Furthermore, the present invention also includes a method of manufacturing these labels and a method of manufacturing a labeled container.

That is, the present invention relates to the following (1) to (26):

(1) A label for in-mold molding comprising a transparent film having a printing surface, an adhesive layer, a thermoplastic resin base material layer, and a heat-sealing layer on the printing surface side of the transparent film, the printing surface having a metal At least one of glossy high-brightness gold printing and silver printing.

(2) A label for in-mold molding comprising a thermoplastic resin base material layer having a printing surface, an adhesive layer and a transparent film are sequentially included on the printing surface side of the thermoplastic resin base material layer, and the thermoplastic resin base material layer The heat-sealing layer is contained on the side opposite to the printing surface comprising at least one of high-brightness gold printing and silver printing with metallic luster.

(3) The label for in-mold molding according to (1) or (2), wherein the transparent film contains a material selected from the group consisting of polyethylene, polypropylene, polyethylene terephthalate, polystyrene, and polystyrene. At least one kind of vinyl chloride, and the haze value of the transparent film is 0% to 20%.

(4) The label for in-mold molding as described in (1) or (2), wherein at least one of the high-brightness gold printing and silver printing with metallic Printed by at least one of printing and screen printing.

(5) A label for cold glue, which contains a transparent film with a printing surface, an adhesive layer, a thermoplastic resin base material layer, and a cold glue receiving layer are sequentially included on the printing surface side of the transparent film, and the printing surface contains a At least one of glossy high-brightness gold printing and silver printing.

(6) A label for cold glue, which comprises a thermoplastic resin substrate layer having a printing surface, an adhesive layer and a transparent film are sequentially contained on the printing surface side of the thermoplastic resin substrate layer, and The side opposite to the printing surface contains a cold glue receiving layer, and the printing surface contains at least one of high-brightness gold printing and silver printing with metallic luster.

(7) The label for cold glue as described in (5) or (6), wherein the transparent film contains a material selected from polyethylene, polypropylene, polyethylene terephthalate, polystyrene, polychlorinated At least one kind of ethylene, and the haze value of the transparent film is 0% to 20%.

(8) The label for cold glue as described in (5) or (6), wherein, at least one of the high-brightness gold printing and silver printing with metallic luster is selected from gravure printing, flexographic printing , Screen printing at least one method to print.

(9) A labeled container having the label for in-mold molding described in (1) or (2).

(10) A labeled container having the label for cold glue according to (5) or (6).

(11) A method for producing a label for in-mold molding, comprising the steps of forming a printing surface on one side of a transparent film, and sequentially laminating an adhesive layer, a thermoplastic resin base layer, and In the heat-sealing layer, the printing surface contains at least one of high-brightness gold printing and silver printing with metallic luster.

(12) A method for producing a label for in-mold molding, which includes the steps of forming a printing surface on one side of a transparent film, providing a heat-sealing layer on one side of a thermoplastic resin base layer, and then adhering the label through an adhesive layer. A printing surface side of the transparent film and a thermoplastic resin layer, the printing surface having at least one of high-brightness gold printing and silver printing with metallic luster.

(13) A method for producing a label for in-mold molding, which includes the steps of forming a printed surface on one side of a thermoplastic resin base layer, and printing a transparent film laminated on the thermoplastic resin base layer via an adhesive layer. On the side of the thermoplastic resin substrate layer, a heat-sealing layer is laminated on the surface opposite to the printed surface containing at least one of high-brightness gold printing and silver printing with metallic luster.

(14) A method for producing a label for in-mold molding, comprising the steps of: providing a heat-sealing layer on one side of a thermoplastic resin base material layer, and then forming a heat-sealing layer on the side of the thermoplastic resin base material layer opposite to the side on which the heat-sealing layer is provided. A printing surface is formed on the surface of the thermoplastic resin substrate layer through an adhesive layer, and a transparent film is laminated on the printing surface side of the thermoplastic resin substrate layer, and the printing surface contains at least one of high-brightness gold printing and silver printing with metallic luster. kind.

(15) The method for producing a label for in-mold molding according to any one of (11) to (14), wherein the transparent film contains a material selected from the group consisting of polyethylene, polypropylene, and polyethylene terephthalate. , polystyrene, and polyvinyl chloride, and the haze value of the transparent film is 0% to 20%.

(16) The method for producing a label for in-mold molding according to any one of (11) to (14), wherein at least one of the high-brightness gold printing and silver printing with metallic luster is selected Printed by at least one of gravure printing, flexographic printing, and screen printing.

(17) A method for producing a label for cold glue, comprising the steps of forming a printing surface on one side of a transparent film, and sequentially laminating an adhesive layer, a thermoplastic resin base material layer, and a cold glue layer on the printing surface side of the transparent film. In the glue-receiving layer, the printing surface contains at least one of high-brightness gold printing and silver printing with metallic luster.

(18) A method for producing a label for cold glue, comprising the steps of forming a printing surface on one side of a transparent film, providing a cold glue receiving layer on one side of a thermoplastic resin substrate layer, and then adhering by an adhesive layer A printing surface side of the transparent film and a thermoplastic resin layer, the printing surface having at least one of high-brightness gold printing and silver printing with metallic luster.

(19) A method for producing a label for cold glue, comprising the steps of forming a printed surface on one side of a thermoplastic resin base layer, and laminating a transparent film on the printed surface of the thermoplastic resin base layer via an adhesive layer On one side, a cold glue-receiving layer is laminated on the surface of the thermoplastic resin substrate layer opposite to the printed surface containing at least one of gold printing and silver printing with high brightness having a metallic luster.

(20) A method for producing a label for cold glue, comprising the steps of: providing a cold glue-receiving layer on one side of a thermoplastic resin base layer, and then forming a cold glue-receiving layer on the side of the thermoplastic resin base material layer The printing surface is formed on the opposite surface, and a transparent film is laminated on the printing surface side of the thermoplastic resin substrate layer through an adhesive layer. A sort of.

(21) The method for producing a label for cold glue according to any one of (17) to (20), wherein the transparent film contains a material selected from polyethylene, polypropylene, polyethylene terephthalate, At least one of polystyrene and polyvinyl chloride, and the haze value of the transparent film is 0% to 20%.

(22) The method for manufacturing a label for cold glue as described in any one of (17) to (20), wherein at least one of the high-brightness gold printing and silver printing with metallic luster is selected from Printed by at least one of gravure printing, flexographic printing, and screen printing.

(23) A method for producing a labeled container, comprising the step of sticking the label for in-mold molding according to (1) or (2).

(24) A method for producing a labeled container, comprising the step of sticking the label for cold glue according to (5) or (6).

(25) The method of manufacturing a labeled container according to (23), wherein the label for in-mold molding is attached by injection molding or hollow molding.

(26) The method of manufacturing a labeled container as described in (24), wherein the pasting of the label for cold glue is carried out by applying an aqueous paste to the cold glue of the label for cold glue by an automatic labeling machine. The receiving layer, through which the cold glue label is applied to the container.

According to the present invention, it is possible to provide a label for in-mold molding or a label for cold glue, a container to which these labels are attached, and a method for manufacturing the label and container, the label for in-mold molding or the label for cold glue being high glossy and It has a high-brightness appearance derived from printed metallic luster, and its printed surface will not be damaged by the content and in-mold molding.

Description of drawings

FIGS. 1 to 4 are schematic diagrams illustrating cross-sectional structures of labels for in-mold molding and labels for cold glue according to Examples 1 to 5 of the present invention, and FIGS. 5 to 7 illustrate labels for in-mold molding of Comparative Examples 1 to 3. A schematic diagram of the cross-sectional structure.

Symbol Description

1 transparent film

2 gold and/or silver printing with metallic luster

3 other printing

4 adhesive layers

5 heat seal layers

6 thermoplastic resin substrate layer

7 cold glue receiving layer

8 gold leaf

9 varnish

10Labels for in-mold molding

11 labels for cold glue

Detailed ways.

Hereinafter, the label of the present invention will be described in detail. In addition, the numerical range represented using "-" in this specification means the range which uses the numerical value described before and after "-" as a lower limit and an upper limit.

1 to 4 illustrate a part of an embodiment of the present invention. 5 to 7 illustrate a part of embodiments of Comparative Examples 1 to 3 which are conventional examples. In the figure, 1 is transparent film, 2 is gold and/or silver printing with metallic luster, 3 is other printing, 4 is adhesive layer, 5 is heat sealing layer, 6 is thermoplastic resin substrate layer, 7 is cold 8 is gold foil, 9 is varnish, 10 is a label for in-mold forming, and 11 is a label for cold glue.

<Transparent film>

The transparent film used in the present invention has a high-gloss appearance, and also has the function of firmly protecting the printed surface containing high-brightness printing, which is the inner layer of the transparent film, from the content or external force such as friction. If the film is opaque, the brightness of the printed surface serving as the inner layer cannot be sufficiently expressed, and the glossiness of the surface also tends to decrease.

As the transparent film used in the present invention, the haze value based on JIS-K-7105 is preferably 0% to 20%, more preferably 0% to 15%, particularly preferably 0% to 10%. When the haze value exceeds 20%, the transparency of the film decreases, and the brightness of gold and/or silver ink decreases. As a raw material of the transparent film, at least one selected from polyethylene, polypropylene, polyethylene terephthalate, polystyrene, and polyvinyl chloride is preferably used. These films may be unstretched or uniaxially or biaxially stretched. The thickness of the outer film is preferably 10 μm to 200 μm. If the thickness of the film is less than 10 μm, the printing direction tends to deviate due to tension during gravure printing or flexographic printing, and when pasted with an adhesive, wrinkles tend to occur and loss increases significantly. In addition, if the thickness of the film exceeds 200 μm, the rigidity of the label is too high. When the label is fixed in the mold by suction or the like during in-mold molding, the label does not follow the curvature of the mold and is easy to fall off from the mold. In addition, when pasting a label for cold glue, the label does not follow the curvature of the bottle and tends to warp after pasting, which is not preferable.

<Printing ink>

The high-brightness gold ink and/or silver ink used in the present invention provides a label with a high appearance based on a metallic luster appearance simply by printing or coating.

Here, "high brightness" in the present invention means that the glossiness (measurement angle: 75°) measured based on JIS-P8142 is 90% to 140%, preferably 100% to 130%.

When the glossiness is less than 90%, the printed part becomes dark and the desired metallic luster cannot be obtained.

The present invention uses high-brightness gold and/or silver printing with metallic luster, and as the ink used in the high-brightness gold and/or silver printing with metallic luster, it is preferable to use metal inks such as aluminum paste and copper powder. Metallic inks such as pearlescent pigments mainly composed of powder, mica powder, etc. are particularly preferably high-brightness coating agents mainly composed of metal thin film flakes and containing adhesive resins as described in detail in the above [Patent Document 5]. As a specific example of the high-brightness coating agent, "Fain Lapp Su-Pa-Metalik" manufactured by Dainippon Ink Chemical Industry Co., Ltd., etc. can be used.

Conventional so-called metallic ink exhibits metallic luster by blending metal fine powder, but tends to have a grainy, somewhat matte appearance due to diffuse reflection on the surface of the fine powder. In contrast, in order to obtain a non-grainy, metallic appearance similar to a mirror surface or a polished metal surface, various types of foil pressing or vapor deposition can be performed, but compared with printing, productivity is low and the cost is high , showing limited degrees of freedom.

For the high-brightness coating agent mentioned above, by orienting the metal thin film flakes dispersed in the coating agent in the plane direction, it is possible to obtain a high-brightness, non-particle-like metal coating that is substantially equivalent to metal foil or metal vapor deposition by a printing method. Glossy appearance, therefore, it is preferred.

As a printing method using these inks, a printing method such as gravure printing, flexographic printing, screen printing, or offset printing can be used, which is also one of the major features of the present invention. When the printing surface is formed by a printing method, not only the entire surface of the label, but also a partial metallic luster layer region formed with an arbitrary pattern can be produced on any part of the label. In addition, when performing gravure printing, it is possible to produce color gradations that make the light reflectance of the metallic luster layer region have continuous gradations. In addition, the ink printing surface can also be formed by coating, and examples of ink coating methods include general coating such as roll coating, gravure coating, curtain coating, spray coating, and dispensing coating. method.

Due to the light reflection not only on the transparent film surface, but also on the gold-printed and/or silver-printed surface efficiently, the label of the present invention has a higher gloss and thus a higher brightness.

<Adhesive layer>

The pressure-sensitive adhesive layer of the present invention adheres the above-mentioned transparent film and the thermoplastic resin base material layer described later. In addition, it is in direct contact with the above-mentioned printing surface.

As the adhesive used in the present invention, any of hot-melt type, solvent type, aqueous type, and solvent-free type can be used. For the method of lamination, any of dry lamination, wet lamination, hot-melt lamination, thermal lamination, extrusion lamination, and printing lamination can be used. Among them, the dry lamination method and the hot melt lamination method are particularly preferable because of high adhesive strength. Preferable examples of adhesive components include acrylics, polyesters, vinyl acetates, EVAs, polyurethanes, and the like. The thickness of the adhesive layer is preferably 0.1 μm to 20 μm, more preferably 0.5 μm to 10 μm. When the thickness is less than 0.1 μm, the adhesive force is low, and when the film is pasted, punching processing or in-mold molding, high-speed labeling of adhesive labels, and further use by the end user, the gap between the transparent film and the thermoplastic resin base layer is easy. peel off. When the thickness exceeds 20 μm, not only the adhesive strength is too high and the cost is extremely high, but also the solvent-based adhesive is not preferable since drying is delayed and residual solvents are large.

<Thermoplastic resin substrate layer>

The thermoplastic base material layer of the present invention constitutes a form for insertion into the above-mentioned printing surface together with the above-mentioned transparent film. In particular, for labels for in-mold molding, the base material layer has the function of firmly protecting the printed surface, which is the inner layer of the thermoplastic resin base material layer, from the molten resin which is the raw material of the container, and contains High brightness printing.

As the raw material constituting the thermoplastic substrate layer, for example, films of the following substances can be mentioned: propylene resin; polyethylene resin such as high-density polyethylene and medium-density polyethylene; polymethyl-1-pentene, ethylene- Polyolefin resins such as cyclic olefin copolymers; polyethylene terephthalate resins; polyvinyl chloride resins; nylon-6, nylon-6,6, nylon-6,10, nylon-6,12, etc. Amide resins; ABS resins; and ionomer resins, etc. These resins may be used alone or in combination of at least two types.

Among them, thermoplastic resins having a melting point of 130° C. to 280° C., such as propylene-based resins, high-density polyethylene, and polyethylene terephthalate resins, are preferable. Among resins satisfying such conditions, propylene-based resins are particularly preferable in view of chemical resistance, cost, and the like. The propylene-based resins include propylene homopolymers showing isotactic or syndiotactic stereoregularity; propylene and ethylene, 1-butene, 1-hexene, 1-heptene, Copolymers of α-olefins such as 4-methyl-1-pentene. These copolymers may be binary, ternary, or quaternary, and may be random copolymers or block copolymers.

In addition, inorganic fine powder, organic fine powder, or the like may be appropriately blended with the above-mentioned thermoplastic resin. Examples of inorganic fine powders include heavy calcium carbonate, light calcium carbonate, fired clay, talc, barium sulfate, diatomaceous earth, magnesium oxide, zinc oxide, titanium oxide, silicon oxide, and the like. Among them, ground calcium carbonate, fired clay, and talc are preferable because they are inexpensive and have good formability.

The organic fine powder is preferably selected from resins that have a higher melting point or glass transition temperature than the thermoplastic resin used for the base material layer and are incompatible in order to form pores. Specific examples include polyethylene terephthalate, polybutylene terephthalate, polyamide, polycarbonate, polyethylene naphthalate, polystyrene, acrylate And polymers or copolymers of methacrylates, melamine resins, polyethylene sulfites (polyechin sulfite), polyimides, polyether ketones, polyphenylene sulfides, homopolymers of cyclic olefins, and Copolymers of cyclic olefins and ethylene (COC), etc. Among them, when a polyolefin resin is used as the above-mentioned thermoplastic resin, it is preferably selected from polyethylene terephthalate, polybutylene terephthalate, polyamide, polycarbonate, polyethylene naphthalate Homopolymers of esters, polystyrene, cyclic olefins, and copolymers (COC) of cyclic olefins and ethylene, etc. are selected for use.

The above-mentioned fine powders may be used alone, or at least two kinds may be selected and used in combination. When at least two kinds are selected and used in combination, inorganic fine powder and organic fine powder can be mixed and used. Furthermore, a dispersant, an antioxidant, a compatibilizing agent, an ultraviolet stabilizer, an antiblocking agent, etc. can be added as needed.

The thermoplastic resin base material layer may be a single layer or a multilayer. When the thermoplastic resin base layer is multilayered, it has a core layer and a surface layer and a back layer arranged on both sides thereof, and each layer may be composed of the same thermoplastic resin or may be composed of different types of thermoplastic resins. In addition, when inorganic or organic fine powders are blended therein, their types and amounts may be the same or different. In addition, stretched or unstretched thermoplastic resin base material layers can be preferably used.

The thermoplastic resin base layer may be transparent or opaque. If it is transparent, the substrate of the container can be seen through the transparent part of the whole layer of the label, which increases the overall sense of the label and the container. If it is opaque, the information on the label can be read more clearly. As a method of obtaining an opaque thermoplastic resin base material layer, the following methods are known: a method containing the above-mentioned inorganic fine powder and/or organic fine powder as a filler; further stretching a resin film containing a filler to form a A method for voids; and a method for further disposing a concealing layer on the thermoplastic resin substrate layer, etc.

The thickness of these thermoplastic resin films is 10 μm to 200 μm, preferably 20 μm to 100 μm. If the thickness is less than 10 μm, the effect of providing the thermoplastic resin base material layer cannot be sufficiently obtained. If the thickness exceeds 200 μm, the rigidity of the label is too high, and problems such as the label being lifted from the container are likely to occur. In addition, in the case of in-mold molding, there is a tendency to easily fall off the mold.

<Heat seal layer>

The heat-sealing layer used in the label for in-mold molding of the present invention is provided on the surface of the thermoplastic resin base material layer opposite to the surface on which the transparent film is laminated. Furthermore, when performing in-mold molding, it is activated by the heat of the molten resin which is the material of the container, and the label and container are bonded together.

The heat-sealing layer is made of resin, and any resin can be used as long as the resin has the function of being able to adhere to the resin material constituting the labeled container by heating during in-mold molding. Examples of preferred resins include low-density and medium-density high-pressure polyethylene with a density of 0.900 g/cm ³ to 0.935 g/cm ³ , straight polyethylene with a density of 0.880 g/cm ³ to 0.940 g/cm ³ Linear polyethylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-alkyl acrylate copolymer, ethylene-alkyl methacrylate copolymer (the number of carbon atoms in the alkyl group is 1 to 8 ), metal salts of ethylene-methacrylic acid copolymers (Zn, Al, Li, K, Na, etc.), polyethylene-based resins with a melting point of 60°C to 130°C.

Among them, high-pressure-process polyethylene or linear polyethylene having a degree of crystallinity (X-ray method) of 10% to 60% and a number average molecular weight of 10,000 to 40,000 at the above-mentioned density is preferable. Among them, in consideration of the adhesiveness to the resin molded article, the following linear linear polyethylene using a metallocene catalyst (in particular, using a metallocene-aluminoxane catalyst) is particularly preferable. , In addition, using, for example, a catalyst containing a metallocene compound and a compound that reacts with the metallocene compound to form a stable anion disclosed in pamphlets such as International Publication No. 92/01723), 40% by weight to 98% by weight of ethylene and 60% by weight Linear polyethylene obtained by copolymerizing α-olefins having 3 to 30 carbon atoms in % to 2% by weight.

These polyolefin resins may be used alone or in combination of at least two kinds. Other well-known additives for resins may be arbitrarily added to the heat-sealing layer within the range that does not interfere with the required performance. Examples of such additives include dyes, nucleating agents, plasticizers, release agents, antioxidants, antiblocking agents, flame retardants, ultraviolet absorbers, and the like.

The heat-sealing layer can be provided on one side of the thermoplastic resin base layer by extrusion lamination of the resin material constituting the heat-sealing layer, or the heat-sealing layer can be formed by co-extrusion during molding of the thermoplastic base layer. resin material to set the heat seal layer. Alternatively, a resin solution dissolved in a solvent such as toluene or ethyl cellosolve, or an emulsion-like water dispersion solution may be applied to one side of the thermoplastic resin base material layer and dried to provide the heat-sealing layer.

The thickness of these heat-sealing layers is preferably 1 μm to 100 μm, and more preferably 2 μm to 30 μm. If the thickness is less than 1 μm, the adhesive strength to the container cannot be fully exhibited, and the label tends to partially warp. If the thickness exceeds 100 μm, the rigidity of the label is too high, and problems such as the label being lifted from the container are likely to occur. In addition, in the case of in-mold molding, there is a tendency to easily fall off the mold.

<Cold glue receiving layer>

The cold glue receiving layer used in the label for cold glue of the present invention is provided on the surface of the thermoplastic resin base material layer opposite to the surface on which the transparent film is laminated. As the cold glue receiving layer, any cold glue receiving layer can be preferably used as long as it can be coated with commercially available starch paste, casein paste, synthetic paste, etc. by an automatic labeling machine to be continuously pasted on the bottle. Specifically, the following methods can be used arbitrarily to set the cold glue receiving layer: after dissolving calcium carbonate or kaolin clay with binders such as latex in water, coating and drying to set the cold glue receiving layer; A method in which a thermoplastic resin such as olefin is filled with specific inorganic fine powder, and stretched in one direction or two directions to form a cold glue receiving layer with holes that can be coated and dried with the above-mentioned paste (see JP-A-2001 -164017 communiqué, Japanese Patent Laid-Open No. 2004-68017 communique); a method of bonding non-woven fabrics and other materials that can absorb water, etc.

<Manufacturing method of labeled container>

The manufacturing method of the labeled container in the present invention is not particularly limited, and generally used molding methods can be appropriately used for the in-mold molding label or the cold glue label.

Among them, if a label for in-mold molding is used, a preferred example of a method of manufacturing a labeled container is as follows: the label is attached in advance so as to be in contact with the wall surface of the mold, and the parison of molten thermoplastic resin is introduced into the mold. Hollow molding (blow molding), or injection molding using a molten thermoplastic resin, or vacuum molding or pressure molding using a molten thermoplastic resin sheet, among them, injection molding and hollow molding are particularly preferred.

In addition, if a label for cold glue is used, a preferable example of a method of manufacturing a container with a label is as follows: using an automatic labeling machine to continuously apply a water-based paste to the cold glue receiving layer of the label and stick it to the container. method.

[Example]

Although Examples and Comparative Examples are given below to further describe the present invention, the present invention is not limited to these Examples and the like. As long as the object of the present invention is not deviated from, the materials, usage amounts, ratios, processing contents, processing order and the like described in the following examples can be appropriately changed.

<Example 1>

On one side of a commercially available biaxially stretched polypropylene film (thickness: 30 μm, haze: 3%) as a transparent film, the above-mentioned Example "Preparation of High Brightness Coating Agent" of [Patent Document 5] was used. The high-brightness coating agent prepared by the method described in is used as a high-brightness silver ink with metallic luster, and is reverse-printed by a gravure printing method. Reverse printing is a method of pre-printing a mirror image so that the correct information can be seen when viewing the printed surface through a transparent film.

The in-mold label base paper (94% opacity based on JIS-Z-8722) described in Example 1 of JP-A-9-207166 was prepared as a thermoplastic resin base layer. The base paper for the in-mold label is provided with a heat-sealing layer on one side of the thermoplastic resin substrate layer. On the surface of the thermoplastic resin substrate layer side of the in-mold label base paper, apply a two-component modified acrylic adhesive (trade name "AP368", manufactured by Chuo Rika Kogyo Co., Ltd.), and dry to set the adhesive. For the adhesive layer, the adhesive layer is laminated and pasted by contacting the printed surface of the above-mentioned transparent film by a dry lamination method. As a result, an opaque label for in-mold molding having a laminated structure of transparent film/print layer/adhesive layer/thermoplastic resin substrate layer/heat seal layer was obtained. A schematic cross-sectional view of the obtained label for in-mold molding is shown in FIG. 1 .

The label for in-mold forming is punched into the specified label form for blow molding. Using a labeling machine manufactured by Machinmeito, the label was inserted into one side of a mold (combined mold) included in a blow molding machine manufactured by Prakoichi, sucked from the mold side, and fixed by bringing the transparent film side into contact with the mold. Then, a parison of high-density polyethylene (melting point 134°C) was melt-extruded at 200°C, and then, after the mold was closed, a pressure of 4.2kgf/ ^cm2 was supplied to the parison to expand to form a container, The label is melted and fixed on the container to obtain a container with a label, which has high brightness and clear printing.

In addition, injection molding was performed using the same labels that were punched. After manually inserting the label into a mold with a product shape of 130 mm × 150 mm in an injection molding machine made by Niigata Iron Works, the mold is closed, and the injection pressure is 750kgf/cm ² , and the temperature is 230°C in the mold. Polypropylene (melting point: 160°C) is injection-molded, and the label is melted and fixed on the molten resin that becomes the container to obtain a container with a label. The label has high brightness and clear printing.

When evaluating the state of the labeled container of Example 1 from the appearance, it was found that the label maintained a high-brightness and clear printed appearance as before being melted and fixed on the container.

Furthermore, regarding the content-resistant and scratch-resistant tests of the container of Example 1, the container was immersed in a stock solution of a commercially available shampoo (Meritto, manufactured by Kao Corporation) and kept at 40° C. for 24 hours. After one hour, whether or not the ink on the surface was peeled off was checked using an adhesive tape (manufactured by Nichiban Co., Ltd.), and no peeling of the ink was found. Likewise, even when scratched with a nail (claw), no drop-off of the ink was observed.

Here, the glossiness of the printed part of the label of Example 1 was measured at a measurement angle of 75 degrees using a digital variable angle glossmeter manufactured by Suga Testing Instruments based on JIS-P8142, and the glossiness was 120%.

<Example 2>

In the same procedure as in Example 1, a transparent film in which a high-brightness silver ink was reverse-printed was prepared. In addition, a commercially available non-stretched polypropylene film (haze: 5%) with a thickness of 80 μm was prepared as a thermoplastic resin film, and an extrusion laminator set at 250° C. EVA (ethylene-vinyl acetate copolymer) at °C was extrusion-laminated to a thickness of 30 μm, and a heat-sealing layer was provided. Next, the printed surface of the transparent film and the non-stretched polypropylene film were bonded by a hot-melt lamination method using a polyurethane-based moisture-curable hot-melt adhesive. As a result, a high-brightness printed transparent label for in-mold molding having a laminated structure of transparent film/print layer/adhesive layer/thermoplastic resin substrate layer/heat seal layer was obtained. A schematic cross-sectional view of the obtained label for in-mold molding is shown in FIG. 1 . The label for in-mold molding was melted and fixed to blow-molded containers and injection containers by the same method as in Example 1 to obtain a container with a label having high brightness and clear printing.

The evaluation of the appearance, the test of resistance to contents and the test of scratch resistance were carried out in the same manner as in Example 1, and the results were the same as in Example 1.

In addition, when the glossiness of the printed portion 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 thermoplastic resin substrate layer side of the in-mold label base paper (94% opacity according to JIS-Z-8722) described in Example 1 of JP-A-9-207166, the The same high-brightness silver ink of embodiment 1 carries out gravure printing. Further, a polyurethane-based moisture-curable hot-melt adhesive was applied to the printed surface, and a biaxially stretched polypropylene film (haze: 3%) having a thickness of 30 μm was attached. As a result, an opaque label for in-mold molding having a laminated structure of transparent film/adhesive layer/print layer/thermoplastic resin substrate layer/heat seal layer was obtained. A schematic cross-sectional view of the obtained label for in-mold molding is shown in FIG. 2 . The label for in-mold molding was melted and fixed to the blown container and the injection container by the same method as in Example 1 to obtain a container with a label having high brightness and clear printing.

The evaluation of the appearance, the test of resistance to contents and the test of scratch resistance were carried out in the same manner as in Example 1, and the results were the same as in Example 1.

In addition, when the glossiness of the printed portion of the label of Example 3 was measured by the same method as in Example 1, the glossiness was 105%.

<Example 4>

In the same procedure as in Example 1, reverse printing was performed on one side of a biaxially stretched polypropylene film (haze: 3%) having a thickness of 30 μm. In addition, a water-absorbent cold-glue label base paper (97% opacity according to JIS-Z-8722) described in JP-A-2004-68017 was prepared, and a polyurethane-based moisture-curable hot-melt adhesive was applied to the An adhesive layer is provided on the surface of the thermoplastic resin base material layer, and then adhered to the printing surface. In this way, an opaque cold glue label printed with high brightness was obtained. A schematic cross-sectional view of the obtained cold glue label is shown in FIG. 3 . After stamping the cold glue label into the prescribed shape, use the Koyo automatic mechanism automatic glue label machine (LNS type) to apply the starch paste (Tokiwanol 650WR, Tokiwa Chemical Industry) on the cold glue receiving layer, and then stick it For glass bottles, a container with a label is obtained, which is high-brightness and vividly printed.

The evaluation of the appearance, the test of resistance to contents and the test of scratch resistance were carried out in the same manner as in Example 1, and the results were the same as in Example 1.

In addition, when the glossiness of the printed portion of the label of Example 4 was measured by the same method as in Example 1, the glossiness was 120%.

<Example 5>

On the surface of the thermoplastic resin base layer side of the water-absorbent cold-glue label base paper (97% opacity based on JIS-Z-8722) described in JP-A-2004-68017, using the The same high-brightness silver ink of Example 1 is used for gravure printing. Further, a polyurethane-based moisture-curable hot-melt adhesive was applied to the printed surface, and a biaxially stretched polypropylene film (haze: 3%) having a thickness of 30 μm was attached. Accordingly. An opaque cold glue label printed with high brightness was obtained. A schematic cross-sectional view of the obtained cold glue label is shown in FIG. 4 . The cold glue label was attached to the glass bottle by the same method as in Example 4 to obtain a container with a label, which had high brightness and clear printing.

The evaluation of the appearance, the test of resistance to contents and the test of scratch resistance were carried out in the same manner as in Example 1, and the results were the same as in Example 1.

In addition, when the glossiness of the printed portion of the label of Example 5 was measured by the same method as in Example 1, the glossiness was 105%.

<Comparative example 1>

In the same manner as in Example 3 above, for the thermoplastic resin substrate layer side of the in-mold label base paper (opacity of 94% according to JIS-Z-8722) described in the examples of JP-A-9-207166 Gravure printing is performed on the surface, and a gold foil is further processed by a hot stamping method to obtain a label for in-mold molding. A schematic cross-sectional view of the obtained label for in-mold molding is shown in FIG. 5 . The label for in-mold molding was melt-fixed to the container by the same method as in Example 1 to obtain a labeled container.

In this labeled container, although the brightness of the printed and foil-applied portion is clear, since this portion exists on the outermost layer, the content resistance or scratch resistance of the label of the labeled container Poor sex.

Furthermore, when the glossiness of the printed portion of the label of Comparative Example 1 was measured by the same method as in Example 1, the glossiness was 100%.

<Comparative example 2>

In the same manner as in Example 3 above, for the thermoplastic resin substrate layer side of the in-mold label base paper (opacity of 94% according to JIS-Z-8722) described in the examples of JP-A-9-207166 Gravure printing is performed on the surface, and a gold foil is further processed by a hot stamping method to obtain a label for in-mold molding.

Further, 4 g/m ² of UV curable varnish (manufactured by T&K TOKA) was coated on the surface of the label for in-mold molding using a bar coater, and cured by UV irradiation to obtain a mold having a protective layer based on the varnish. Labels for inner molding. A schematic cross-sectional view of the obtained label for in-mold molding is shown in FIG. 6 . The label for in-mold molding was melt-fixed to the container by the same method as in Example 1 to obtain a labeled container.

However, in the obtained container, the brightness of the printed and foiled portion was low, and it was a resin container with a label lacking in sharpness.

Furthermore, when the glossiness of the printed portion of the label of Comparative Example 2 was measured by the same method as in Example 1, the glossiness was 85%.

<Comparative example 3>

The label for in-mold molding described in Example 1 of [Patent Document 5] was prepared. A schematic cross-sectional view of the label is shown in FIG. 7 . This label was melt-fixed to the container by the same method as in Example 1 to obtain a labeled container. However, in the case of injection molding, the pressure of the molten resin during injection causes the heat-sealing layer to flow together with the ink in the obtained container, and not only the high-brightness printing but also most of the usual printed parts disappear.

Furthermore, when the glossiness of the printed portion of the label of Comparative Example 3 was measured by the same method as in Example 1, the glossiness was 85%.

Claims (26)

1. the in-molded label of using, it contains the hyaline membrane with printing surface, printing surface one side at this hyaline membrane contains adhering agent layer, thermoplastic resin base material layer and heat sealing layer successively, and described printing surface contains at least a in the golden seal brush of the high brightness with metallic luster and the silver printing.

2. the in-molded label of using, it contains the thermoplastic resin base material layer with printing surface, printing surface one side at this thermoplastic resin base material layer contains adhering agent layer and hyaline membrane successively, face one side opposite with its printing surface at this thermoplastic resin base material layer contains heat sealing layer, and described printing surface contains at least a in the golden seal brush of the high brightness with metallic luster and the silver printing.

3. the in-molded label of using as claimed in claim 1 or 2, wherein, described hyaline membrane contains at least a kind that is selected from tygon, polypropylene, polyethylene terephthalate, polystyrene, the Polyvinylchloride, and the haze value of this hyaline membrane is 0%～20%.

4. the in-molded label of using as claimed in claim 1 or 2, wherein, at least a in the golden seal of described high brightness with metallic luster brush and the silver printing is to print by at least a kind of method that is selected from photogravure, aniline printing, serigraphy, the hectographic printing.

5. cold glue label, it contains the hyaline membrane with printing surface, printing surface one side at this hyaline membrane contains adhering agent layer, thermoplastic resin base material layer and cold glue receiving layer successively, and described printing surface contains at least a in the golden seal brush of the high brightness with metallic luster and the silver printing.

6. cold glue label, it contains the thermoplastic resin base material layer with printing surface, printing surface one side at this thermoplastic resin base material layer contains adhering agent layer and hyaline membrane successively, face one side opposite with its printing surface at this thermoplastic resin base material layer contains the cold glue receiving layer, and described printing surface contains at least a in the golden seal brush of the high brightness with metallic luster and the silver printing.

7. as claim 5 or 6 described cold glue labels, wherein, described hyaline membrane contains at least a kind that is selected from tygon, polypropylene, polyethylene terephthalate, polystyrene, the Polyvinylchloride, and the haze value of this hyaline membrane is 0%～20%.

8. as claim 5 or 6 described cold glue labels, wherein, at least a in the golden seal of described high brightness with metallic luster brush and the silver printing is to print by at least a kind of method that is selected from photogravure, aniline printing, serigraphy, the hectographic printing.

9. the container that has label, it has claim 1 or the 2 described in-molded labels of using.

10. the container that has label, it has claim 5 or 6 described cold glue labels.

11. in-molded manufacture method with label, it comprises following operation: form printing surface on the one side of hyaline membrane, in printing surface one side of this hyaline membrane lamination adhering agent layer, thermoplastic resin base material layer and heat sealing layer successively, described printing surface contains at least a in the golden seal brush of the high brightness with metallic luster and the silver printing.

12. in-molded manufacture method with label, it comprises following operation: form printing surface on the one side of hyaline membrane, on the one side of thermoplastic resin base material layer, heat sealing layer is set, come printing surface one side and the thermoplastic resin of bonding hyaline membrane then by adhering agent layer, described printing surface contains at least a in the golden seal brush of the high brightness with metallic luster and the silver printing.

13. in-molded manufacture method with label, it comprises following operation: form printing surface on the one side of thermoplastic resin base material layer, by adhering agent layer with printing surface one side of hyaline membrane lamination in this thermoplastic resin base material layer, lamination heat sealing layer on the face opposite with its printing surface of this thermoplastic resin base material layer, described printing surface contain at least a in the golden seal brush of the high brightness with metallic luster and the silver printing.

14. in-molded manufacture method with label, it comprises following operation: on the one side of thermoplastic resin base material layer heat sealing layer is set, on the opposite face of the one side with being provided with heat sealing layer of this thermoplastic resin base material layer, form printing surface then, with printing surface one side of hyaline membrane lamination in this thermoplastic resin base material layer, described printing surface contains at least a in the golden seal brush of the high brightness with metallic luster and the silver printing by adhering agent layer.

15. as any described in-molded manufacture method of claim 11～14 with label, wherein, described hyaline membrane contains at least a kind that is selected from tygon, polypropylene, polyethylene terephthalate, polystyrene, the Polyvinylchloride, and the haze value of this hyaline membrane is 0%～20%.

16. as any described in-molded manufacture method of claim 11～14 with label, wherein, at least a in the golden seal of described high brightness with metallic luster brush and the silver printing is to print by at least a kind of method that is selected from photogravure, aniline printing, serigraphy, the hectographic printing.

17. the cold glue manufacture method of label, it comprises following operation: form printing surface on the one side of hyaline membrane, in printing surface one side of this hyaline membrane lamination adhering agent layer, thermoplastic resin base material layer and cold glue receiving layer successively, described printing surface contains at least a in the golden seal brush of the high brightness with metallic luster and the silver printing.

18. the cold glue manufacture method of label, it comprises following operation: form printing surface on the one side of hyaline membrane, the cold glue receiving layer is set on the one side of thermoplastic resin base material layer, come printing surface one side and the thermoplastic resin of bonding hyaline membrane then by adhering agent layer, described printing surface contains at least a in the golden seal brush of the high brightness with metallic luster and the silver printing.

19. the cold glue manufacture method of label, it comprises following operation: form printing surface on the one side of thermoplastic resin base material layer, by adhering agent layer with printing surface one side of hyaline membrane lamination in this thermoplastic resin base material layer, lamination cold glue receiving layer on the face opposite with its printing surface of this thermoplastic resin base material layer, described printing surface contain at least a in the golden seal brush of the high brightness with metallic luster and the silver printing.

20. the cold glue manufacture method of label, it comprises following operation: the cold glue receiving layer is set on the one side of thermoplastic resin base material layer, on the opposite face of the one side with being provided with the cold glue receiving layer of this thermoplastic resin base material layer, form printing surface then, with printing surface one side of hyaline membrane lamination in this thermoplastic resin base material layer, described printing surface contains at least a in the golden seal brush of the high brightness with metallic luster and the silver printing by adhering agent layer.

21. as the manufacture method of any described cold glue of claim 17～20 with label, wherein, described hyaline membrane contains at least a kind that is selected from tygon, polypropylene, polyethylene terephthalate, polystyrene, the Polyvinylchloride, and the haze value of this hyaline membrane is 0%～20%.

22. as the manufacture method of any described cold glue of claim 17～20 with label, wherein, at least a in the golden seal of described high brightness with metallic luster brush and the silver printing is to print by at least a kind of method that is selected from photogravure, aniline printing, serigraphy, the hectographic printing.

23. have the manufacture method of the container of label, it comprises following operation: paste claim 1 or the 2 described in-molded labels of using.

24. have the manufacture method of the container of label, it comprises following operation: paste claim 5 or 6 described cold glue labels.

25. the manufacture method that has the container of label as claimed in claim 23, wherein, described in-molded stickup with label is undertaken by injection moulding or slush molding.

26. the manufacture method that has the container of label as claimed in claim 24, wherein, described cold glue is following carrying out with the stickup of label: by the automated tag machine aqueous paste is coated the cold glue receiving layer of cold glue with label, by this aqueous paste cold glue is pasted on container with label.

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