Plastic container and charged product

Abstract

To provide a plastic container realizing both of the application quantity of ink for maintaining recycle suitability and the contrast for reading a one-dimensional or two-dimensional code with a reader.SOLUTION: A plastic container 1 according to the present disclosure comprises a container body 10 and a printed part 20 including a primer layer 21 having an alkali-peel-ability and an ink layer 22. The printed part has an identification code portion 20A. The identification code portion at least has an information image portion 22A showing a gathering of one-dimensional code bars or of two-dimensional code cells as the ink layer and possesses a symbol contrast as measured by a code verifier in a state in which a plastic piece 100 which a region including the identification code portion is cut out of the container body is put on white paper and depressed in a planar form against the same of 20% or higher and a total quantity of adhered ink dried on the printed part of 2.5 mass% or less with respect to the total mass of the container body and the printed part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to plastic containers and filled products. [Background technology]

[0002] There is a growing trend to conserve resources, and there is a demand to reduce single-use plastics. Labels on plastic containers, including PET bottles, are discarded after their intended use is completed, and plastic labels in particular are difficult to recycle, leading to a very high disposal rate. In order to achieve a label-less environment, a technology has been developed for directly printing on plastic containers (see, for example, Patent Document 1). Patent Document 1 proposes a technology for directly printing necessary product information, such as the product name, ingredients, content, expiration date, and manufacturer, on the bottle.

[0003] In recent years, product information such as that engraved in Patent Document 1 is increasingly being recorded in one- or two-dimensional codes, and devices have been proposed that inspect whether the one- or two-dimensional code information printed on bottles is printed correctly (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2011-11819 A [Patent Document 2] WO2020 / 071188 publication Summary of the Invention [Problem to be solved by the invention]

[0005] In order to meet the recyclability requirements for label-less plastic containers, it is necessary to reduce the total amount of ink applied. On the other hand, as part of efforts to differentiate in the market, there are cases where a design image with high aesthetic value or a large printing area is required, and measures are required to reduce the total amount of ink applied to the entire image including the design image and product information. In the case of stamp printing as in Patent Document 1, the printing color is only white, and the aesthetic value of the design image is insufficient. In addition, when a one-dimensional code or two-dimensional code is printed by stamp printing, the code portion is white, and the code may not be properly identified by a print inspection device that determines the quality of printing by a binary threshold value as in Patent Document 2.

[0006] For this reason, when using colored inks to directly print on the outer surface of a plastic container, the total amount of ink applied to the entire image, including the design image and product information, is required to be within a range that satisfies recyclability.However, when using one-dimensional or two-dimensional codes as product information and reducing the amount of ink applied to the one-dimensional or two-dimensional code, the relationship between the amount of ink applied that can be read by a code reader and the symbol contrast has not yet been found.

[0007] The present disclosure aims to provide a plastic container and a filled product that achieves both an ink application amount that maintains recyclability and contrast that enables a one-dimensional or two-dimensional code to be read by a reader. [Means for solving the problem]

[0008] The plastic container according to the present invention is a plastic container comprising a container body having a mouth and a body connected to the mouth, and a printed part including a primer layer having alkali releasability provided on the outer surface of the body and an ink layer provided on the primer layer, wherein the printed part has an identification code part, and the identification code part has at least an information image part showing an aggregate of bars of a one-dimensional code or an aggregate of cells of a two-dimensional code as the ink layer, and wherein a symbol code trust (SC) measured by a code verifier conforming to ISO / IEC 15415 and ISO / IEC 15416 in a state in which a region including the identification code part is cut out of the container body and the plastic piece is placed on a white paper and pressed flat is 20% or more, and the total amount of dried ink adhesion of the printed part is 2.5% by mass or less of the total mass of the container body and the printed part.

[0009] In the plastic container according to the present invention, it is preferable that the identification code portion further includes a background printed portion as the ink layer, so that the code can be read regardless of the color of the content liquid.

[0010] In the plastic container according to the present invention, the amount of dried ink attached per identification code portion is preferably 0.150 to 300 mg / piece, which can improve recyclability while maintaining contrast that allows the code to be read.

[0011] In the plastic container according to the present invention, it is preferable that the identification code portion represents a one-dimensional code, and the amount of dried ink attached per identification code portion is 5.00 to 300 mg / piece. This makes it possible to further improve recyclability while maintaining a contrast that allows the one-dimensional code to be read.

[0012] In the plastic container according to the present invention, it is preferable that the identification code portion represents a two-dimensional code, and the amount of dried ink attached per identification code portion is 0.150 to 170 mg / piece, which can improve recyclability while maintaining a contrast that allows the two-dimensional code to be read.

[0013] The filled product according to the present invention is characterized in that the plastic container according to the present invention is filled with a content.

[0014] The filled product according to the present invention is a filled product in which a white content is filled in a plastic container comprising a container body having a mouth and a body connected to the mouth, and a printed part including a primer layer having alkali releasability provided on the outer surface of the body and an ink layer provided on the primer layer, the printed part having an identification code part, the identification code part only having an information image part showing an aggregate of bars of a one-dimensional code or an aggregate of cells of a two-dimensional code as the ink layer, the symbol code trust (SC) measured by a code verifier conforming to ISO / IEC 15415 and ISO / IEC 15416 in a state in which a plastic piece obtained by cutting out a region including the identification code part from the container body is placed on a white paper and pressed flatly, the symbol code trust (SC) is 20% or more, the total amount of dry ink adhesion of the printed part is 2.5% by mass or less with respect to the total mass of the container body and the printed part, and the dry ink adhesion amount per identification code part is 0.150 to 130 mg / piece. This allows the code to be more recyclable while still maintaining a readable contrast. Effect of the Invention

[0015] According to the present disclosure, it is possible to provide a plastic container and a filled product that achieves both an ink application amount that maintains recyclability and a contrast that allows a one-dimensional or two-dimensional code to be read by a reader. [Brief description of the drawings]

[0016] [Figure 1]1 is an image showing an example of a plastic container according to an embodiment of the present invention. [Diagram 2] FIG. 4 is a schematic cross-sectional view showing an example of an identification code portion. [Diagram 3] 13 is a schematic cross-sectional view showing another example of the identification code portion. FIG. [Figure 4] FIG. 2 is a schematic plan view showing an example of a plastic piece, in which a print layer shows a one-dimensional code. [Diagram 5] FIG. 2 is a schematic plan view showing an example of a plastic piece, in which a print layer shows a two-dimensional code. [Figure 6] 1 is a schematic diagram for explaining the method for measuring symbol contrast. (a) shows a plastic piece placed on a white piece of paper, and (b) shows the state during measurement when the plastic piece is pressed against the white piece of paper. [Figure 7] 1 is an image showing an example of a filled product according to the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] The embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to these descriptions. Various modifications of the embodiments may be made as long as the effects of the present invention are achieved.

[0018] The plastic container 1 according to this embodiment is a plastic container comprising a container body 10 having a mouth 11 and a body 12 connected to the mouth 11 as shown in FIG. 1, and a printed section 20 including a primer layer 21 having alkali peelability provided on the outer surface of the body 12 and an ink layer 22 provided on the primer layer 21 as shown in FIG. 2, in which the printed section 20 has an identification code section 20A, and the identification code section 20A has at least an information image section 22A showing an aggregate of bars of a one-dimensional code or an aggregate of cells of a two-dimensional code as the ink layer 22, and in which a plastic piece 100 (shown in FIG. 4 or FIG. 5) obtained by cutting out a region including the identification code section 20A from the container body 10 is placed on a blank sheet of paper and pressed flatly against the paper, and the plastic piece 100 is printed in accordance with ISO / IEC 15415, ... The symbol code trust (SC) measured using a code verifier conforming to 15416 is 20% or more, and the total amount of dried ink adhering to the printed portion 20 is 2.5 mass% or less of the total mass of the container body 10 and the printed portion 20.

[0019] The thermoplastic synthetic resin that is the material of the plastic container 1 is not particularly limited, but examples thereof include polyethylene terephthalate resin (PET), polybutylene terephthalate resin, polyethylene naphthalate resin, polyethylene resin, polypropylene resin (PP), cycloolefin copolymer resin (COC, cyclic olefin copolymer), ionomer resin, poly-4-methylpentene-1 resin, polymethyl methacrylate resin, polystyrene resin, ethylene-vinyl alcohol copolymer resin, acrylonitrile resin, polyvinyl chloride resin, polyvinylidene chloride resin, polyamide resin, polyamideimide resin, polyacetal resin, polycarbonate resin, polysulfone resin, or tetrafluoroethylene resin, acrylonitrile-styrene resin, and acrylonitrile-butadiene-styrene resin. Among these, PET is particularly preferred. The capacity of the plastic container 1 is not particularly limited, and is, for example, 280 ml to 2000 ml.

[0020] The method for molding the plastic container 1 is not particularly limited, but may be, for example, a blow molding method. Specifically, first, a preform is manufactured by injection molding a thermoplastic resin, and then the preform is blow molded to manufacture the plastic container 1 having a shape in which a mouth portion 11 and a body portion 12 are connected in order as shown in FIG.

[0021] The container body 10 has an internal space for accommodating contents. The contents are not particularly limited, but may be, for example, liquids such as beverages, alcoholic beverages, and seasonings, foods, medicines, or industrial products. The beverages may be, for example, white beverages such as milk, yogurt beverages, lactic acid bacteria beverages, milk beverages, and alcoholic beverages, colored and transparent beverages such as straight tea, lemon tea, green tea, fruit juice beverages, carbonated beverages, and beer, cloudy beverages such as milk tea and coffee, or transparent beverages such as sports drinks, water, carbonated water, and chuhai.

[0022] The mouth 11 is a filling port and a pouring port for the contents. A cap (not shown) is attached to the mouth 11 to seal the bottle. A neck support ring may be formed at the lower end of the mouth 11.

[0023] The body 12 is a portion connected to the lower end of the mouth 11, and may have, in order from the mouth 11 side, an upper body 12a whose diameter increases from the lower end of the mouth 11 downward, a cylindrical body main body 12b, and a lower body 12c that is connected to the body main body 12b and has a ground surface with approximately the same diameter as the body main body 12b. The upper body 12a is sometimes called a shoulder due to its shape. The body main body 12b is, for example, cylindrical or regular n-sided cylindrical (where n is an integer of 4 or more). The lower body 12c becomes the bottom of the container body 10.

[0024] The printed section 20 is provided on at least one part of the upper body 12a, the body main body 12b, and the lower body 12c. FIG. 1 shows an example in which the body main body 12b is provided with an identification code section 20A indicating a one-dimensional code as the printed section 20, but the present invention is not limited to this. When the body 12 has ribs, it is preferable that the identification code section 20A is provided in a portion that avoids the ribs. The printed section 20 may be only the identification code section 20A, or may include a design image section (not shown) in addition to the identification code section 20A. The printed section 20 may be provided in only one area, or in two or more areas. The printed section 20 is preferably provided in a light-transmitting portion of the body 12. Examples of light-transmitting forms include achromatic, colorless and transparent with a visible light transmittance that allows the viewer to see through the body 12, chromatic, colored and transparent with a visible light transmittance that allows the viewer to see through the body 12, semi-transparent with a visible light transmittance that allows the viewer to read characters on the other side of the body 12 by light transmitted through the body 12, and opaque with a visible light transmittance that allows the viewer to see the silhouette of characters on the other side of the body 12 by light transmitted through the body 12. Containers in which at least a portion of the body 12 is light-transmitting include, but are not limited to, a general PET bottle in which the entire body 12 is colorless and transparent, and a foamed PET bottle in which at least a portion of the body 12 is semi-transparent or opaque with visible light transmittance.

[0025] As shown in FIG. 2, the printed portion 20 has a primer layer 21 and an ink layer 22 in this order from the outer surface side of the body portion 12.

[0026] The primer layer 21 is a layer for ensuring adhesion between the body 12 and the ink of the printed portion 20, and is a layer for enabling the entire printed portion 20 to be peeled off and separated from the body 12 when recycling the plastic container 1 due to its alkali peelability. The primer layer 21 has alkali peelability. For example, in a recycling system, containers such as PET bottles are crushed and pulverized, and then sorted into crushed containers having a high specific gravity and crushed lids having a low specific gravity by a specific gravity separation method. This sorting is performed, for example, by immersing the container in a treatment liquid (for example, an alkaline aqueous solution). The primer layer 21 having alkali peelability can make the container excellent in recyclability. The alkali peelability refers to the property that the primer layer 21 peels off from the body 12 when immersed in an alkaline solution. The alkali peelability may be, for example, that the primer layer 21 dissolves in an alkali and peels off from the body 12, or that the primer layer 21 does not dissolve in an alkali and peels off at the interface between the body 12 and the primer layer 21 in the alkaline solution. In this embodiment, the primer layer 21 is preferably such that, for example, when a region of the plastic container 1 including at least the printed portion 20 is immersed and stirred in a 1.5 mass % sodium hydroxide aqueous solution at 85° C. or higher and 90° C. or lower for 15 minutes, at least a portion of the printed portion 20 peels off from the body portion 12. The thickness of the primer layer is not particularly limited, but is preferably 6 to 26 μm, and more preferably 11 to 15 μm.

[0027] The primer layer 21 is, for example, a coating film of a primer layer forming composition, and is preferably a cured film of an active energy ray curable inkjet ink. The active energy ray curable inkjet ink preferably contains, for example, a polymerizable monomer and a polymerizable surfactant. From the viewpoint of alkali peelability, the polymerizable monomer preferably contains at least a polyfunctional monomer. The polyfunctional monomer is not particularly limited as long as it is a monomer having two or more polymerizable groups. From the viewpoint of curability, the polyfunctional monomer is preferably a polyfunctional radical polymerizable monomer, and more preferably a polyfunctional ethylenically unsaturated monomer, for example, 3-methyl-1,5-pentanediol di(meth)acrylate, triethylene glycol di(meth)acrylate, or 1,10-decanediol di(meth)acrylate. The polymerizable monomer may further contain a monofunctional monomer in addition to the polyfunctional monomer. The monofunctional monomer is not particularly limited as long as it is a monomer having one polymerizable group. From the viewpoint of curability, the monofunctional monomer is preferably a monofunctional radical polymerizable monomer, more preferably a monofunctional ethylenically unsaturated monomer. Examples of the monofunctional ethylenically unsaturated monomer include monofunctional (meth)acrylate, monofunctional (meth)acrylamide, monofunctional aromatic vinyl compound, monofunctional vinyl ether and monofunctional N-vinyl compound, such as cyclic trimethylolpropane formal (meth)acrylate, 2-(meth)acryloyloxyethyl succinic acid, stearyl (meth)acrylate, and 4-hydroxybutyl (meth)acrylate. Examples of the polymerizable surfactant include polymerizable silicone surfactant, polymerizable fluorine surfactant, and polymerizable acrylic surfactant.Examples of commercially available polymerizable silicone surfactants include silicone surfactants having a (meth)acryloyl group, such as BYK-UV3500, 3505, 3530, 3570, 3575, and 3576 (manufactured by BYK), Tegorad2100, 2200, 2250, 2300, 2500, 2600, 2700, 2800, 2010, and 2011 (manufactured by Evonik), EBECRYL350 and 1360 (manufactured by Daicel-Allnex), and KP-410, 411, 412, 413, 414, 415, 416, 418, 420, 422, and 423 (manufactured by Shin-Etsu Silicones). Examples of polymerizable fluorine-based surfactants include compounds having a perfluoroalkyl group and a polymerizable group. Commercially available polymerizable fluorosurfactants include, for example, fluorosurfactants having a (meth)acryloyl group, such as Megafac RS-56, RS-72-K, RS-75, RS-76-E, RS-65-NS, RS-78, and RS-90 (manufactured by DIC Corporation). Polymerizable acrylic surfactants include, for example, compounds in which a polymerizable group is bonded to the side chain of a poly(meth)acrylic structure. Commercially available polymerizable acrylic surfactants include, for example, CN821 (manufactured by Sartomer Corporation). The active energy ray-curable inkjet ink may contain at least one type of polymerization initiator. The polymerization initiator is preferably a radical polymerization initiator that generates radicals, such as bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide or 1,3-di({α-[1-chloro-9-oxo-9H-thioxanthen-4-yl)oxy]acetylpoly[oxy(1-methylethylene)]}oxy)-2,2-bis({α-[1-methylethylene)]}oxymethyl)propane.

[0028] The ink layer 22 is formed on the primer layer 21 and is a layer showing letters, numbers, or symbols (hereinafter, letters, numbers, or symbols may be collectively referred to as letters, etc.), and / or design images such as illustrations or icons. The ink layer 22 may consist of only one layer, or may be two or more layers.

[0029] The ink layer 22 of the identification code section 20A has an information image section 22A showing a collection of bars of a one-dimensional code or a collection of cells of a two-dimensional code. In addition to the information image section 22A, the ink layer 22 of the identification code section 20A may have other image sections showing characters and / or design images. The one-dimensional code is, for example, a barcode such as JAN / EAN / UPC code, ITF code, CODE39, NW-7 (CODABAR), or CODE128. The two-dimensional code is, for example, a matrix type two-dimensional code such as QR code (registered trademark), microQR code (registered trademark), DataMatrix, or VeriCode, or a stack type two-dimensional code such as PDF417 or CODE49. The thickness of the information image section 22A is not particularly limited, but is preferably 6 to 26 μm, and more preferably 6 to 15 μm.

[0030] In the plastic container 1 according to the present embodiment, the identification code section 20A preferably further includes a background printed section 22B as the ink layer 22, as shown in FIG. 3. The plastic container 1 according to the present embodiment is distributed in the market as a filled product filled with the contents, and the one-dimensional code or two-dimensional code of the identification code section 20A may be read in the market. In such a case, the ink layer 22 of the identification code section 20A includes the background printed section 22B in addition to the information image section 22A, so that the one-dimensional code or two-dimensional code indicated by the identification code section 20 can be read regardless of the color of the content liquid. In addition, when the one-dimensional code or two-dimensional code is read from an empty bottle before the contents are filled, it may not be possible to read the code if the background of the code is transparent. However, the ink layer 22 of the identification code section 20A includes the background printed section 22B in addition to the information image section 22A, so that the one-dimensional code or two-dimensional code indicated by the identification code section 20 can be read. The background printed portion 22B is preferably a solid print provided between the primer layer 21 and the information image portion 22A, and may be a single coat or two or more coats. The thickness of the background printed portion 22B is not particularly limited, but is preferably 6 to 26 μm, and more preferably 11 to 15 μm. The background printed portion 22B may be a white print printed between the bars or between the cells of the information image portion 22A. In this case, the background printed portion 22B and the information image portion 22A are formed on the primer layer 21.

[0031] The ink layer of the design image portion is a portion that displays an image for enhancing the design, such as a logo showing a product name or company name, or a color, painting, photograph, illustration, or pattern.

[0032] The ink layer 22 preferably has a cured product of an active energy ray curable inkjet ink. The active energy ray curable inkjet ink has the same structure as the active energy ray curable inkjet ink exemplified as a preferred embodiment of the composition for forming a primer layer, except that it contains a colorant. Examples of the colorant include dyes and pigments. From the viewpoint of durability such as heat resistance, light resistance, and water resistance, the colorant is preferably a pigment. As the pigment, any of organic pigments and inorganic pigments that are usually commercially available can be used. Examples of the pigment include the pigments described in "Dictionary of Pigments" edited by Seijiro Ito (published in 2000), "Industrial Organic Pigments" by W. Herbst and K. Hunger, JP-A No. 2002-12607, JP-A No. 2002-188025, JP-A No. 2003-26978, and JP-A No. 2003-342503. The color of the colorant may be any color, such as black, white, blue, red, green, yellow, orange, etc., and is not particularly limited, but when printing the information image section 22A of the identification code section 20A, it is preferable that the colorant be black, blue, or green. When printing the background printing section 22B, it is preferable that the colorant be white, red, yellow, or orange. The black pigment is, for example, carbon black. The white pigment is, for example, titanium dioxide.

[0033] The total amount of dry ink adhesion of the printed part 20 is 2.5% by mass, preferably 2.4% by mass or less, more preferably 0.7% by mass or less, and even more preferably 0.6% by mass or less, based on the total mass of the container body 10 and the printed part 20. The lower limit of the total amount of dry ink adhesion of the printed part 20 may be appropriately set according to the mass of the container body, and is not particularly limited, but is, for example, 0.17% by mass or more based on the total mass of the container body 10 and the printed part 20. The total amount of dry ink adhesion of the printed part 20 is the sum of the dry mass of the primer layer 21 and the dry mass of the ink layer 22. For example, when the printed part 20 is the identification code part 20A and the design image part, the total amount of dry ink adhesion of the printed part 20 is the amount obtained by adding the dry mass of the primer layer 21 and the dry mass of the ink layer 22 in the identification code part 20A to the dry mass of the primer layer 21 and the dry mass of the ink layer 22 in the design image part. The total amount of dry ink adhesion of the printed part 20 can be obtained, for example, as follows. The mass (mass W1) of the entire plastic container 1 is measured in advance, and the mass (mass W2) of the container body 10 is measured after at least the area including the printed part 20 of the plastic container 1 is immersed in an alkaline solution (for example, a 1.5% by mass sodium hydroxide aqueous solution at 85°C to 90°C) to peel off and remove the printed part 20 and dry it. The difference (W1-W2) between the mass W1 and the mass W2 is the total amount of dried ink attached to the printed part 20. The mass of the container body 10 is the mass of the container body 10 itself before the printed part 20 is provided, and is the mass W2. The total mass of the container body 10 and the printed part 20 is the mass of the container body 10 plus the total amount of dried ink attached to the printed part 20, and is the sum of the mass W1 and the mass W2 (W1+W2). When a foamed PET bottle is used as the container body, even if the ink layer 22 does not have the background printed part 22B and only has the information image part 22A, a readable symbol contrast can be ensured. Therefore, the total amount of dried ink attached to the entire plastic container 1 can be reduced.

[0034] An example of a method for forming the printed part 20 will be described below in the case where the composition for forming the primer layer and the composition for forming the ink layer are active energy ray curable inkjet inks. First, an active energy ray curable inkjet ink is ejected from an inkjet head as a composition for forming the primer layer and attached to the outer surface of the body 12. Then, active energy rays are irradiated to form a cured film. This cured film is the primer layer 21. Next, an active energy ray curable inkjet ink is ejected from an inkjet head as a composition for forming the ink layer and attached to the primer layer 21. Then, active energy rays are irradiated to form a cured product. When the ink layer 22 is two or more layers, the ink is repeatedly attached and cured. The obtained cured product is the ink layer 22. The active energy rays are not particularly limited, and are, for example, gamma rays, beta rays, electron beams, ultraviolet rays, or visible rays. Of these, it is preferable that the active energy rays are ultraviolet rays.

[0035] As shown in FIG. 4 or 5, the identification code portion 20A has a symbol contrast (hereinafter, also referred to as symbol contrast on white paper or SC on white paper) of 20% or more measured by a code verifier conforming to ISO / IEC 15415 or ISO / IEC 15416 in a state where a plastic piece 100 obtained by cutting out a region including the identification code portion 20A from the container body 10 is placed on a white paper 901 and pressed flat as shown in FIG. 6(b). The symbol contrast of the identification code portion 20A on the white paper is preferably 40% or more, more preferably 60% or more. The white paper 901 may be any paper that is white in color and is not particularly limited, but may be, for example, plain paper, coated paper, or white cardboard. The whiteness of the white paper is not particularly limited, but is preferably 70 to 100%, more preferably 80 to 95%. The thickness of the white paper is not particularly limited, but is preferably 0.05 to 1.00 mm, and more preferably 0.07 to 0.50 mm. When measuring the symbol contrast, if the white paper is placed on a smooth surface 900 such as a workbench and the white paper is thin enough to show through the color of the base, multiple sheets of white paper are stacked together so that the color of the base does not show through, and then the symbol contrast is measured.

[0036] As shown in Fig. 4 or 5, the plastic piece 100 is preferably cut out from the body 12 with a margin of about 10 to 40 mm around the identification code portion 20A. When the identification code portion 20A shows a one-dimensional code, the size of the plastic piece 100 is preferably 45 to 200 mm in the length direction of the bar and 15 to 70 mm in the width direction of the code. When the identification code portion 20A shows a two-dimensional code, the size of the plastic piece 100 is preferably 16 to 70 mm in the length of one side. The present invention is not limited to the size of the plastic piece 100.

[0037] The measurement of the symbol contrast on a blank piece of identification code is performed, for example, as follows. When the body 12 is cylindrical, the plastic piece 100 is curved as shown in Fig. 6(a), but a blank piece of paper 901 is placed on a smooth surface 900 such as a workbench, and the plastic piece 100 is pressed against the blank piece of paper 901 as shown in Fig. 6(b) so that there is no gap between the blank piece of paper 901 and the plastic piece 100, and the identification code section 20A is read by a barcode verifier. In this way, the symbol contrast is measured. The barcode verifier is a device that complies with ISO / IEC 15415 and ISO / IEC 15416, and is, for example, the LVS-9580 Verifier manufactured by MICROSCAN.

[0038] In the plastic container 1 according to this embodiment, the amount of dry ink attached per identification code portion 20A is preferably 0.150 to 300 mg / piece, more preferably 0.200 to 280 mg / piece, and even more preferably 0.300 to 220 mg / piece. If it is less than 0.150 mg / piece, the symbol contrast may be low and the code may not be readable. If it exceeds 300 mg / piece, the amount of ink used may be excessive. The amount of dry ink attached per identification code portion 20A is the total amount of dry ink associated with one one-dimensional code and associated printing, or the total amount of dry ink associated with one two-dimensional code and associated printing. For example, if an identification code section 20A has a primer layer 21, a background printed section 22B, and an information image section 22A, the amount of dry ink adherence per identification code section 20A is the sum of the dry mass of the primer layer 21, the dry mass of the background printed section 22B, and the dry mass of the information image section 22A.

[0039] In the plastic container 1 according to this embodiment, the identification code portion indicates a one-dimensional code, and the amount of dried ink attached per identification code portion 20A is preferably 5.00 to 300 mg / piece, and more preferably 7.00 to 280 mg / piece. If it is less than 5.00 mg / piece, the symbol contrast may be low and the code may not be readable. If it exceeds 300 mg / piece, the ink usage may be excessive. It is possible to further improve recyclability while maintaining a contrast that allows the one-dimensional code to be read.

[0040] In the plastic container 1 according to this embodiment, the identification code portion 20A shows a two-dimensional code, and the amount of dried ink attached per identification code portion 20A is preferably 0.150 to 170 mg / piece, and more preferably 0.200 to 160 mg / piece. If it is less than 0.150 mg / piece, the symbol contrast may be low and the code may not be readable. If it exceeds 170 mg / piece, the ink usage may be excessive. It is possible to further improve recyclability while maintaining a contrast that allows the two-dimensional code to be read.

[0041] In the filled product according to the present embodiment, the plastic container 1 according to the present embodiment is filled with contents. In the filled product according to the first example of the present embodiment, it is preferable that the identification code section further has a background printed section 22B as an ink layer, as shown in FIG. 3. By having the background printed section 22B, the filled product according to the first example can make it possible to read the one-dimensional code or two-dimensional code indicated by the identification code section 20 regardless of the color of the contents. The contents are not particularly limited, and are, for example, the contents described above. Furthermore, in the filled product according to the first example, the color of the contents is not particularly limited.

[0042] A filled product 2 of a second example according to this embodiment is a filled product in which the plastic container 1 according to this embodiment is filled with a content, as shown in Fig. 7, and the color of the content is white. In the filled product 2 shown in Fig. 7, a lactic acid bacteria drink (Kirin iMUSE (registered trademark) Yogurt Taste, manufactured by Kirin Beverage Co., Ltd.) is filled as a white content in the plastic container 1 shown in Fig. 1, and a cap 30 is screwed onto the mouth part 11 (shown in Fig. 1) to seal it. White includes milky white, cloudy white, and translucent white. The white content is not particularly limited, and is, for example, a white drink such as milk, yogurt drink, lactic acid bacteria drink, milk drink, or alcoholic drink.

[0043] In the filled product of the second example according to the present embodiment, the identification code portion 20A has only the information image portion 22A as the ink layer 22 as shown in FIG. 2, and the amount of dried ink attached per identification code portion 20A is 0.150 to 130 mg / piece. The amount of dried ink attached per identification code portion 20A is more preferably 0.200 to 120 mg / piece. If it is less than 0.150 mg / piece, the symbol contrast is low and the code may not be readable. If it exceeds 130 mg / piece, the ink usage is excessive and may not be obtained. If the contents are white, the identification code portion 20A of the filled product can ensure a symbol contrast equivalent to the symbol contrast on a white paper even without providing the background printed portion 22B, so the background printed portion 22B can be omitted. As a result, the total amount of dried ink attached in the entire plastic container 1 can be reduced. When the identification code portion 20A shows a one-dimensional code, the weight is preferably 5.00 to 127 mg / piece, more preferably 7.00 to 125 mg / piece, and even more preferably 7.50 to 120 mg / piece. When the identification code portion 20A shows a two-dimensional code, the weight is preferably 0.150 to 90 mg / piece, more preferably 0.200 to 75 mg / piece, and even more preferably 0.300 to 60 mg / piece. This makes it possible to further improve recyclability while maintaining contrast that allows the code to be read. EXAMPLES

[0044] Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. In the examples, "parts" and "%" refer to "parts by mass" and "% by mass", respectively, unless otherwise specified. The number of parts added is a value calculated as a solid content.

[0045] (Experimental Example 1) (Formation of primer layer) Using an inkjet recording device (Cylinder JET, manufactured by Tritec) and an inkjet head (KM1024i, manufactured by Konica Minolta), a UV-curable inkjet ink having alkali peelability (hereinafter referred to as primer) was applied as a primer layer-forming composition to the body portion 12b of a container body 10 having a capacity of 450 ml and a cylindrical body portion 12b as shown in FIG. 1. Specifically, the primer was applied to an area of ​​41 cm in the longitudinal direction of the container body 10 and 14 cm in the circumferential direction of the container body 10 under conditions of a droplet amount of 14 pL and a resolution of 720 x 720 dpi (dots per inch), and a 100% solid image was recorded. After applying the primer, an LED light source attached to the inkjet recording device was used to record an exposure amount of 0.5 J / cm. 2 The primer layer 21 was formed by irradiating the substrate with ultraviolet light at a wavelength of 385 nm. As the LED light source, a UV-LED irradiator (G5A, manufactured by Kyocera) with a peak wavelength of 385 nm was used. The mass of the container body 10 was 28 g.

[0046] (Formation of background print area) Next, under the same conditions as those for applying the primer, a white UV-curable inkjet ink (hereinafter referred to as white ink) containing a white pigment as a composition for forming an ink layer was applied onto the primer layer 21, a solid white image of a predetermined density was recorded as the background printing portion 22B, and ultraviolet light was irradiated under the same conditions as those for curing the primer.

[0047] (Formation of information image part) Next, a black UV-curable inkjet ink (hereinafter referred to as black ink) containing a black pigment was applied as an ink layer forming composition on the background printing section 22B under conditions of a droplet volume of 14 pL and a resolution of 720 x 720 dpi (dots per inch), and a one-dimensional code image of a predetermined density was recorded as the information image section 22A, followed by irradiation with ultraviolet light under the same conditions as for curing the primer. The primer layer forming composition and the ink layer forming composition have the compositions exemplified in the detailed description of the invention. The one-dimensional code image was a truncated standard barcode, with the barcode height being 9 mm and the barcode width being 37.29 mm in size.

[0048] In Experimental Example 1, the white ink density display in Illustrator (hereinafter referred to as white ink density) was set to 100%, 80%, 60%, 40%, 20%, and 0%, and the black ink density display in Illustrator (hereinafter referred to as black ink density) was set to 100%, 80%, 60%, 40%, and 20%, and the identification code section 20A was printed as described above by combining the white ink density and the black ink density. A white ink density of 0% means that no background printing section was formed, and the information image section 22A was formed directly on the primer layer 21.

[0049] (Experimental Example 2) In forming the primer layer in Experimental Example 1, the region where the primer was applied was changed to 42 cm in the longitudinal direction of the container body 10 and 15 cm in the circumferential direction of the container body 10, and in forming the information image portion in Experimental Example 1, a two-dimensional code image of a predetermined density was recorded as the information image portion 22A, but the identification code portion 20A was printed in the same manner as in Experimental Example 1. The two-dimensional code image had 50 x 50 cells and a size of 12.60 mm x 12.60 mm.

[0050] (Amount of dried ink attached) The dry mass (g) of the primer was calculated by multiplying the total amount (ml) of the primer discharged from the inkjet recording device by the specific gravity (g / ml) of the primer. The dry mass of the white ink and the dry mass of the black ink were calculated in the same manner. The dry ink adhesion amount per identification code portion is the sum of the dry mass of the primer, the dry mass of the white ink, and the dry mass of the black ink. Table 1 shows the dry mass of the white ink, the dry mass of the black ink, and the dry mass of the primer for each combination of the white ink concentration and the black ink concentration per one-dimensional code as the identification code portion 20A, and Table 2 shows the dry mass of the white ink, the dry mass of the black ink, and the dry mass of the primer for each combination of the white ink concentration and the black ink concentration per two-dimensional code as the identification code portion 20A.

[0051] [Table 1]

[0052] [Table 2]

[0053] (Reading evaluation) The reading evaluation of the identification code portion 20A of Experimental Example 1 and Experimental Example 2 was carried out as follows. The results of the one-dimensional code are shown in Table 1, and the results of the two-dimensional code are shown in Table 2. The reading evaluation was carried out by using a plastic piece 100 obtained by cutting out an area including the identification code portion 20A from the plastic container 1 of Experimental Example 1, placing a number of sheets of copy paper (PPC paper-RJ, manufactured by Mitsubishi Oji Paper Sales Co., Ltd.) as blank paper on a workbench so that the color of the workbench was not visible, pressing the plastic piece 100 against the blank paper to make it flat, and reading the one-dimensional code or two-dimensional code of the identification code portion 20A using a barcode verifier (LVS-9580 Verifier manufactured by MICROSCAN Co., Ltd.). The barcode verifier was used to grade the symbol contrast and to measure the symbol contrast on the blank paper. The evaluation criteria were as follows. Grade A, blank SC 70% or more: Practical level Grade B, blank SC is 60% to less than 70%: Practical level Grade C, blank SC is 40% to 60%: Practical level Grade D, SC on blank paper is 20% to less than 40%: Practical level (lower limit of practical use) Grade F, SC on blank paper less than 20%: Unsuitable for practical use × (The code verifier does not recognize the code): Unsuitable for practical use

[0054] As can be seen from Table 1, among the examples of one-dimensional codes where the symbol contrast on a blank sheet measured by a barcode verifier was 20% or more, the amount of dried ink attached to the identification code was a minimum of 0.0095 g / piece (when 0% white, 60% or 50% black) and a maximum of 0.0181 g / piece (when 100% white, 100% black). The amount of dried ink attached to the identification code was 0.06% by mass or less of the total mass of the container body and the identification code, which was significantly smaller than the proportion of dried ink attached to the entire printed part that is suitable for recyclability, which is 2.5% by mass or less. Therefore, it can be said that a plastic container with excellent recyclability can be obtained even if a design image part is provided as a printed part in addition to the identification code part. A plastic container was obtained that achieved both an ink application amount that maintains recyclability and a contrast that allows the one-dimensional or two-dimensional code to be read by a reader.

[0055] As can be seen from Table 2, among the two-dimensional codes in which the symbol contrast on a blank sheet measured by a barcode verifier was 20% or more, the amount of dried ink adhering to the identification code was a minimum of 0.0041 g / piece (when 0% white and 50% black) and a maximum of 0.0079 g / piece (when 100% white and 100% black). The amount of dried ink adhering to the identification code was 0.03% by mass or less of the total mass of the container body and the identification code, which was significantly smaller than the proportion of dried ink adhering to the entire printed part that is suitable for recyclability, which is 2.5% by mass or less. Therefore, it can be said that a plastic container with excellent recyclability can be obtained even if a design image part is provided in addition to the identification code part as the printed part. A plastic container was obtained that achieved both an ink application amount that maintains recyclability and a contrast that allows the one-dimensional or two-dimensional code to be read by a reader.

[0056] (Experimental Example 3) The plastic container 1 of Experimental Example 1 was filled with 450 ml of a lactic acid bacteria drink (Kirin iMUSE (registered trademark) Yogurt Taste, manufactured by Kirin Beverage Co., Ltd.) and sealed with a cap to obtain a filled product. The reading evaluation of the identification code section 20A of Experimental Example 3 was carried out as follows. The reading evaluation was carried out by using a barcode verifier (LVS-9580 Verifier, manufactured by MICROSCAN) to read the one-dimensional code or two-dimensional code of the identification code section 20A of the filled product of Experimental Example 3 from the outside of the container with the contents inside. The barcode verifier was used to judge the grade of the symbol contrast and to measure the symbol contrast. The results are shown in Table 3.

[0057] [Table 3]

[0058] (Experimental Example 4) The plastic container 1 of Experimental Example 1 was filled with 450 ml of milk (Nokyo Gyunyuu (registered trademark), manufactured by Kyodo Nyugyo Co., Ltd.) and sealed with a cap. Reading evaluation was carried out in the same manner as in Experimental Example 3. The results are shown in Table 4.

[0059] [Table 4]

[0060] (Experimental Example 5) The plastic container 1 of Experimental Example 2 was filled with 450 ml of a lactic acid bacteria drink (Kirin iMUSE (registered trademark) Yogurt Taste, manufactured by Kirin Beverage Co., Ltd.) and sealed with a cap. Reading evaluation was performed in the same manner as in Experimental Example 3. The results are shown in Table 5.

[0061] [Table 5]

[0062] (Experimental Example 6) The plastic container 1 of Experimental Example 2 was filled with 450 ml of milk (Nokyo Gyunyuu (registered trademark), manufactured by Kyodo Nyugyo Co., Ltd.) and sealed with a cap. Reading evaluation was carried out in the same manner as in Experimental Example 3. The results are shown in Table 6.

[0063] [Table 6]

[0064] As can be seen from Tables 3 and 5, it was confirmed that the identification code section had a symbol contrast that allowed the code to be read even when the contents were inside. From these results, it is predicted that if there is a background print section, the symbol contrast will be readable regardless of the color of the contents. As shown in Tables 4 and 6, especially when the contents was milk, there was no background print section and high symbol contrast was achieved even with a small amount of black ink. [Explanation of symbols]

[0065] 1. Plastic container 10 Container body 11 Mouth 12 Torso 12a Upper torso 12b Body 12c lower torso 20 Printing Department 20A Identification code section 21 Primer layer 22 Ink layer 22A Information and Image Section 22B Background printing section 100 plastic pieces 900 Smooth surface 901 Blank paper

Claims

1. A container body having a mouth and a body connected to the mouth; a printed portion including a primer layer having alkali releasability provided on an outer surface of the body portion and an ink layer provided on the primer layer; A plastic container comprising: The printing unit has an identification code unit, The identification code portion has at least an information image portion representing a collection of bars of a one-dimensional code or a collection of cells of a two-dimensional code as the ink layer, and a plastic piece obtained by cutting out a region including the identification code portion from the container body is placed on a white paper and pressed flat on the paper. In this state, the symbol code trust (SC) is 20% or more as measured by a code verifier conforming to ISO / IEC 15415 and ISO / IEC 15416; A plastic container, characterized in that the total amount of dried ink adhering to the printed portion is 2.5 mass % or less based on the total mass of the container body and the printed portion.

2. 2. The plastic container according to claim 1, wherein the identification code portion further comprises a background print portion as the ink layer.

3. 2. The plastic container according to claim 1, wherein the amount of dried ink attached per identification code portion is 0.150 to 300 mg / piece.

4. The identification code portion represents a one-dimensional code, 2. The plastic container according to claim 1, wherein the amount of dried ink attached per identification code portion is 5.00 to 300 mg / piece.

5. The identification code portion represents a two-dimensional code, 2. The plastic container according to claim 1, wherein the amount of dried ink attached per identification code portion is 0.150 to 170 mg / piece.

6. A filled product comprising the plastic container according to any one of claims 1 to 5 filled with a content.

7. A container body having a mouth and a body connected to the mouth; a printed portion including a primer layer having alkali releasability provided on an outer surface of the body portion and an ink layer provided on the primer layer; A filled product in which a white content is filled in a plastic container comprising: The printing unit has an identification code unit, The identification code portion has only an information image portion showing a collection of bars of a one-dimensional code or a collection of cells of a two-dimensional code as the ink layer, and a plastic piece obtained by cutting out a region including the identification code portion from the container body is placed on a white paper and pressed flat on the paper. In this state, the symbol code trust (SC) is 20% or more as measured by a code verifier conforming to ISO / IEC 15415 and ISO / IEC 15416; a total amount of dried ink adhering to the printed portion is 2.5% by mass or less with respect to a total mass of the container body and the printed portion; A filled product, characterized in that the amount of dried ink attached per identification code portion is 0.150 to 130 mg / piece.

Images