Label

Abstract

To provide a label using aqueous ink, that can suppress generation of deposit onto a roller or the like of a labeler.SOLUTION: A label comprises a substrate layer, and an aqueous printing layer provided on at least one surface of the substrate layer, and is long-sized. An amount of silicone contained in the aqueous printing layer is 0.05-0.5 mg / m2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a label. [Background technology]

[0002] The body of a beverage or food seasoning container may have a wraparound label (roll label) attached to it, on which the product name, design, various display information, etc. are printed. As the roll label, for example, a long strip (tape-like) label is used, which is printed on the inner and outer surfaces of a plastic film by gravure printing, flexographic printing or the like. The roll label is unwound from the roll (in a wound state) by a labeler (label application machine) and cut into individual unit labels. The unit labels are wrapped around the body of each container by the labeler and attached to the container (or the edges of the unit labels are joined together with an adhesive or the like) to be attached to the container (see, for example, Patent Documents 1 to 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-3804 [Patent Document 2] Japanese Patent Application Publication No. 9-301333 [Patent Document 3] Japanese Patent Application Publication No. 7-67946 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, there has been a demand for label printing to use water-based inks that use water-based solvents instead of oil-based inks that use organic solvents, in order to reduce the generation of VOCs (volatile organic compounds). In particular, the use of flexographic printing using water-based inks (aqueous flexographic printing) is on the rise.

[0005] Against this background, when a long strip of label printed with water-based ink was attached to a container using a labeler, it was found that as the label was unwound from the roll and wound around the container and attached, the inner and outer surfaces of the label (the water-based printing layer on at least one side) came into contact with and rubbed against multiple rollers etc. installed in the labeler as it was fed, and this sometimes resulted in viscous deposits being formed on the rollers etc. If production continues with deposits on rollers, etc., the deposits may transfer from the rollers to the labels and adhere to the labels as foreign matter, or labels with deposits attached may be attached to products, which could result in quality problems. To prevent foreign matter from adhering, it is necessary to frequently remove the deposits and clean the labeler, which reduces the labeler's operating rate (productivity).

[0006] An object of the present invention is to provide a label using a water-based ink that can prevent deposits from forming on the rollers of a labeler. [Means for solving the problem]

[0007] The label of the present invention is long and includes a base layer and an aqueous print layer provided on at least one surface of the base layer. The amount of silicone contained in the aqueous printing layer is 0.05 to 0.5 mg / m 2 is. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a label using a water-based ink that can prevent deposits from occurring on the rollers of a labeler. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a schematic cross-sectional view of an example of a label according to an embodiment. [Figure 2] FIG. 1 is a schematic side view of a testing machine used to evaluate the presence or absence of roller deposits (laboratory test). [Figure 3] FIG. 2 is a schematic side view of a tensile tester used to measure the friction coefficient (static friction coefficient and dynamic friction coefficient) of a label. [Figure 4] FIG. 10 is a schematic perspective view for explaining a method for measuring the coefficient of friction of a label. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or common parts are designated by the same reference numerals.

[0011] <label> FIG. 1 shows a schematic cross-sectional view of an example of a label according to an embodiment. The label 1 includes a base layer 11 and aqueous print layers 12, 13 provided on at least one surface of the base layer 11, and is in a long shape.

[0012] 1, aqueous printed layers 12 and 13 are provided on both sides of the base layer 11. In this way, the aqueous printed layers 12 and 13 may be provided on both sides (front surface 1a and back surface 1b) of the base layer 11, or only either the aqueous printed layer 12 or the aqueous printed layer 13 may be provided on one main surface of the base layer 11 (front surface 1a or back surface 1b).

[0013] The label 1 of this embodiment is, for example, a label that can be attached to an object. The object is not particularly limited, but examples include PET bottles (blow-molded polyethylene terephthalate bottles) for beverages and foods, glass bottles, metal cans, blow-molded resin bottles for daily necessities, various other containers, products themselves, and product packaging such as paper boxes (these may be referred to as "products, etc."). In particular, when the object is a beverage bottle that uses a large number of labels (long, strip-shaped labels) in succession, the label 1 can be used in a labeler for the beverage bottle. The label 1 has, for example, a back surface 1b which is the surface that comes into contact with the object (inside) and a front surface 1a which is the surface on the opposite side (outside).

[0014] (base material layer) The base layer 11 is not particularly limited, but is a layer made of a material capable of supporting the aqueous print layer 12 .

[0015] The base layer 11 may be made of, for example, a resin film. Examples of materials for the resin film include polyethylene-based resins, polypropylene (PP)-based resins, cyclic olefin-based resins, polyolefin-based resins such as copolymer polymers containing polyethylene, polyester-based resins such as polyethylene terephthalate (PET), polyamide-based resins, and polystyrene-based resins. The base layer 11 may be made of, for example, a single layer containing one or more of the above-mentioned resins, or may be made of multiple layers in which multiple such single layers are laminated. The base layer 11 may contain other materials such as paper (paper base material).

[0016] The thickness (total thickness) of the base layer 11 is not particularly limited, but is preferably 5 to 200 μm, and more preferably 10 to 100 μm. In particular, for roll labels (wrap-around labels) for PET beverage bottles, a biaxially oriented film of polypropylene resin having a thickness of 10 to 40 μm or a biaxially oriented PET film having a thickness of 9 to 25 μm is preferred.

[0017] (Aqueous printing layer) The aqueous printed layer 12 is a layer formed by drying the aqueous ink on the base layer 11 (evaporating the aqueous solvent).

[0018] The method for forming the aqueous printing layers 12, 13 is not particularly limited, and the aqueous printing layers can be formed by printing (applying) aqueous ink to the surface of the base layer 11 using conventional gravure printing, flexographic printing, etc., and then drying the ink. It is preferable to form the aqueous printing layers 12, 13 using flexographic printing. For example, if the base layer 11 is a thin film with a thickness of 9 to 30 μm or a stretchy film such as a non-stretched film, the film is pulled during gravure printing, which may cause the film to stretch and reduce printing accuracy. Center drum flexographic printing is a relief printing method in which a film is wrapped around a drum and a flexible rubber or resin plate is used, and because the film is less likely to stretch, more precise printing is possible.

[0019] The aqueous ink used to form the aqueous print layer 12 may contain, for example, an aqueous solvent such as water or an alcoholic aqueous solution, a resin, a curing agent, a pigment, and additives. When the aqueous solvent contains alcohol such as ethyl alcohol or isopropyl alcohol, the alcohol concentration is preferably less than 5%.

[0020] Examples of resins that can be contained in aqueous inks include acrylic resins, urethane resins, polyester resins, polyamide resins, cellulose resins, vinyl chloride resins, vinyl acetate resins, polyolefin resins (e.g., polyethylene resins or polybutadiene resins), isocyanate resins, rosin resins, polyvinyl alcohol resins (PVA resins), and imine resins.

[0021] Additives contained in the water-based ink may include, for example, plasticizers, anti-settling agents, dispersants, stabilizers, anti-foaming agents, fillers, antioxidants, ultraviolet absorbers, antistatic agents, color separation inhibitors, and lubricants.

[0022] As the curing agent contained in the water-based ink, for example, a curing agent that corresponds to the resin contained in the water-based print layer 12 (a curing agent that can cure the resin) can be used. For example, if the resin contained in the water-based ink has a hydroxyl group or an amino group, an isocyanate-based curing agent can be used as the curing agent. Also, if the resin contained in the water-based ink has an amino group or a carbonyl group, an epoxy-based curing agent can be used as the curing agent. Also, if the resin contained in the water-based ink has a carbonyl group, a carbodiimide-based curing agent, an aziridine-based curing agent, or a hydrazide-based curing agent can be used as the curing agent.

[0023] The aqueous print layer 12 may include, for example, a color print layer formed by aqueous ink containing a colorant such as a pigment. The color print layer may contain, for example, different color pigments. By containing different color pigments, multiple color print layers of different colors can be provided in a predetermined area of ​​the base layer 11. This allows predetermined characters or designs to be formed.

[0024] When the base layer 11 (and the aqueous printing layer 13 provided on the front surface 1a of the base layer 11) is transparent or translucent, a color printing layer formed from an aqueous ink containing a color pigment may be provided on the back surface 1b of the aqueous printing layer 12 (the surface that comes into contact with the object when worn) of the base layer 11, and a white printing layer formed from an aqueous ink containing a white pigment (titanium oxide, etc.) may be provided on the outermost surface of the back surface 1b. That is, the aqueous printing layer 12 may be composed of at least one color printing layer on the substrate layer 11 side and one or more white ink layers as solid printing covering the color printing on the back surface 1b side of the color printing layer (the side that contacts the object opposite the substrate layer 11). Note that in cases where a transparent portion is provided without providing a white ink layer as the background of the color printing layer, a back surface coating layer (medium layer) made of transparent ink (medium) may be provided. In this case, various display items such as product name, design, etc. displayed by the color printing layer can be seen from the front surface 1a of the label 1, and these display items can be prevented from becoming dirty or damaged when the object is transported, etc.

[0025] The aqueous print layer 13 may be, for example, a transparent protective layer (medium layer) formed using an aqueous ink (e.g., medium) that does not contain a coloring pigment for imparting gloss, slipperiness, abrasion resistance, etc. to the surface of the label, or a matte print layer (transparent matte surface protective layer) formed using an aqueous ink (matte varnish) that does not contain a coloring pigment and contains a matting agent (matte component). If part of the design is to be matte, the matte print layer may be provided partially in an area that matches the design.

[0026] The matte printing layer contains, for example, a resin component, an extender pigment such as silica or acrylic beads as a matting agent, and a lubricant, and it is preferable that the extender pigment accounts for 10 to 40% by mass and the lubricant for 1 to 10% by mass of the total amount of the matte printing layer.

[0027] In the label 1 of this embodiment, the amount of silicone contained in the aqueous print layer (at least one of the aqueous print layer 12 and the aqueous print layer 13) is 0.05 to 0.5 mg / m 2 The amount of silicone contained in the aqueous print layers 12 and 13 is more preferably 0.1 to 0.46 mg / m 2 is. That is, the amount of silicone contained in the aqueous print layers 12 and 13 is 0.05 to 0.5 mg / m 2 The composition (silicone content) of the aqueous ink used to form the aqueous print layers 12 and 13 and the amount of the aqueous ink to be applied are adjusted so as to achieve the above.

[0028] In addition, when the aqueous printing layers 12 and 13 are provided on both surfaces of the base material layer 11, the amount of silicone contained in the aqueous printing layer on at least one surface of the aqueous printing layer 12 and the aqueous printing layer 13 is 0.05 to 0.5 mg / m 2 is.

[0029] When the aqueous print layer 12 is formed from a plurality of layers (for example, a plurality of color print layers and a white print layer on the outermost surface of the back surface 1b side), the amount of silicone contained in the outermost layer (for example, the white print layer) is 0.05 to 0.5 mg / m 2 It is more preferable that:

[0030] When the aqueous printing layer 13 is a medium layer or a matte printing layer, the amount of silicone contained in the medium layer or the matte printing layer is 0.05 to 0.5 mg / m 2 It is preferable that:

[0031] The inventors discovered that the deposits adhering to labeler rollers (tension rollers, etc.) were mainly silicone, and by focusing on the amount of silicone in the aqueous printing layer (the coating film formed by aqueous ink), they arrived at the present invention. Although silicone is a minor component compared to the resins, color pigments, and matting agents (if the water-based ink is a matte varnish), which are the main components of water-based inks, it is necessary for printability and the slipperiness of the printed surface of the label (water-based printing layer), and it is not preferable to not include silicone in the water-based ink. For this reason, the above problem was solved by incorporating silicone into the water-based ink while reducing the amount of silicone included, and by reducing the amount of water-based ink applied, thereby adjusting the silicone content in the water-based printing layers 12 and 13.

[0032] Silicone is a polymeric compound having a main skeleton containing a siloxane bond, and the silicon atom in the siloxane bond may be bonded to, for example, an organic group (e.g., a methyl group, a phenyl group, etc.).

[0033] The label 1 may be, for example, cylindrical when attached to an object. In this case, the cylindrical label 1 may have an aqueous printing layer 12 (provided on the back surface 1b of the label 1) on the inside (the side that comes into contact with the object) and an aqueous printing layer 13 (matte printing layer) on the outside (provided on the front surface 1a of the label 1). The cylindrical label 1, which is wrapped around the outer surface of a container or the like to form a cylindrical shape, can be produced by cutting a strip-shaped label supplied in a long length to a predetermined length (the length obtained by adding the outer circumference of the body of the PET bottle where the label will be attached to the label to the size of the joint), wrapping the resulting label 1 around the outer surface of the bottle body to form a cylindrical shape, overlapping both ends, and bonding the overlapped portions with a solvent, adhesive, etc. Examples of adhesives include heat-sensitive adhesives (hot-melt adhesives), photosensitive adhesives, and pressure-sensitive adhesives.

[0034] Furthermore, label 1 is not limited to a roll label that is wrapped around a container or the like, but may be any long label in which the printed surface (aqueous printing layers 12, 13) comes into contact with (is fed while rubbing against) rollers or various jigs when the label is fed (running) by a labeler or the like. The label 1 may be, for example, a shrink label (long cylindrical label) made by forming an aqueous printed layer on a heat-shrinkable film. When the label is a shrink label, it may be made by printing on a long heat-shrinkable film, slitting it to a predetermined width, joining both widthwise ends (both edge edges) with a solvent, adhesive, or the like (center sealing) to form a cylindrical shape, and then folding it flat and winding it into a roll.

[0035] The present invention is not limited to the above-described embodiment, and can be modified in various ways. Two or more embodiments selected from the various embodiments described above may be combined as appropriate, or at least one configuration (part of a configuration) selected from the various embodiments described above may be replaced with part of a configuration of another embodiment.

[0036] <Example> Examples of the present invention will be described below, but the present invention is not limited to these examples.

[0037] Example 1 As the label of Example 1, a label (roll label) having a base layer 11 and an aqueous print layer 13 formed on one surface thereof was produced. As the base layer 11, a 30 μm thick OPP (biaxially oriented polypropylene) film (width: 1.0 m, length: 5000 m) was prepared, and one surface of the film was subjected to a corona treatment. Using a flexographic printing machine (Bobst, CI type), a matte varnish (water-based ink) was applied (solid printing) to the entire surface of the corona-treated side of the film, which corresponds to the label surface, and the printed surface was dried to form an aqueous printed layer on one side of the base layer.The label was then slit into a width of 50 mm to produce a long, strip-shaped label (a 5000 m long roll label). Cell capacity 4.0cc / m for anilox rolls in flexographic printing machines 2 In this case, the amount of water-based ink applied was 1.50 g / m 2 Therefore, the amount of silicone contained in the aqueous printing layer (matte printing layer) was 0.45 mg / m 2 (See Table 1).

[0038] The matte varnish contains 0.03% by mass of silicone (organically modified polysiloxane), 40% by mass of solids including silicone, and 60% by mass of water. In addition to silicone, the solids also contain 55-80% by mass of a resin component (acrylic thermoplastic resin), 10-40% by mass of a matting agent, and the remainder being other additives (lubricants, etc.).

[0039] (Comparative Examples 1 and 2) In Comparative Examples 1 and 2, labels were produced by changing the amount of water-based ink (matte varnish) applied using anilox rolls with different cell capacities on a flexographic printing machine, thereby changing the silicone content in the water-based printing layer (matte printing layer). Specifically, the cell capacity of the anilox roll was changed as shown in Table 1, and the amount of silicone in the aqueous printing layer was adjusted to be as shown in Table 1. Note that when the cell capacity of the anilox roll was 10 cc / m 2 In this case, the amount of water-based ink applied is 2.64 g / m 2 The cell capacity is 5.5cc / m 2 In this case, the amount of water-based ink applied is 1.78 g / m 2This becomes: Labels (roll labels) of Comparative Examples 1 and 2 were produced in the same manner as in Example 1 except for the above points.

[0040] (Examples 2 and 3) The amount of silicone (organo-modified polysiloxane) blended into the matte varnish was changed to 0.012 mass %. The cell volume of the anilox roll of the flexographic printing machine was set as shown in Table 1, and the amount of silicone in the aqueous printing layer was set as shown in Table 1. Note that the cell volume of the anilox roll was 16 cc / m 2 In this case, the amount of water-based ink applied is 3.78 g / m 2 This becomes: Labels (roll labels) of Examples 2 and 3 were produced in the same manner as in Example 1 except for the above points.

[0041] <Evaluation of roller deposits> The presence or absence of roller deposits was evaluated for the labels of the above Examples 1 to 3 and Comparative Examples 1 and 2. Specifically, the following laboratory test (accelerated test) and actual production simulation test were carried out.

[0042] (1) Lab test (accelerated test) The roll labels produced in Examples 1 to 3 and Comparative Examples 1 and 2 were subjected to roll-to-roll label rewinding (the label was unwound from roll 51 and rewound onto roll 52) with a metal rod 4 in contact (pressed) with the aqueous printing layer (matte printing layer) of label 1, as shown in Figure 2. The length of the roll label rewound in the test was 1000 m. That is, while the strip-shaped label having the aqueous print layer was being unwound, the label was run for 1000 m with the aqueous print layer in contact with the surface of a fixed metal rod. The rewinding speed (label running speed) is 130 m / min. The metal rod 4 is made of iron with a chrome-plated surface and has a diameter of 10 mm. To facilitate the adhesion of deposits, the metal rod 4 is fixed so as not to rotate, and the label is brought into contact with the surface (part of the periphery) of the metal rod 4 so that the label feed direction before contact and the label feed direction after contact differ by 30 degrees, as shown in Figure 2. After the rewinding was completed, the presence or absence of deposits on the surface of the metal rod 4 was visually evaluated. In addition, the deposits adhering to the metal rod 4 were sampled, and the total mass of the deposits was measured. The results of the evaluation and measurements are shown in Table 1.

[0043] [Table 1]

[0044] As shown in Table 1, the amount of silicone contained in the aqueous printing layer (matte printing layer) was 0.5 mg / m 2 In the labels of Examples 1 to 3 below, no deposits were observed adhering to the metal rod. In contrast, when the amount of silicone contained in the aqueous printing layer (matte printing layer) was 0.5 mg / m 2 For the labels of Comparative Examples 1 and 2, which were greater than 1.0 mg, adhesion of deposits (total mass: 3.2 mg, 1.0 mg) to the metal rod was observed. Note that this accelerated test was conducted under conditions that made it easier for deposits to adhere to the metal rod than the actual production simulation test described below, and even in this case, no deposits were observed adhering to the metal rod for the labels of Examples 1 to 3.

[0045] (2) Actual production mock test The roll labels produced in Examples 1, 3, and Comparative Example 1 were wound onto 600 mL PET bottles using a roll labeler manufactured by Shibuya Kogyo Co., Ltd., at a setting of 600 labels per minute (operating speed may vary), and approximately 5,000 m of label was unwound from the roll and run while rotating and contacting each roller of the labeler. At 600 labels per minute, the running speed was approximately 130 m / min. The condition of the surface of the roller that contacted the aqueous printing layer (matte printing layer) of the label (presence or absence of deposits) was then visually observed to evaluate the presence or absence of deposits. The evaluation results are shown in Table 2.

[0046] [Table 2]

[0047] As shown in Table 2, the amount of silicone contained in the aqueous printing layer (matte printing layer) was 0.5 mg / m 2 In the labels of Examples 1 and 3 below, no deposits were observed adhering to the roller. In contrast, the amount of silicone contained in the aqueous printing layer (matte printing layer) was 0.5 mg / m 2 For the label of Comparative Example 1, which was over 100%, adhesion of deposits to the roller was observed.

[0048] <Measurement of static and dynamic friction coefficients> The coefficients of friction of the labels of Example 3 and Comparative Example 1 were measured. Specifically, the static and dynamic friction coefficients of the aqueous print layer 12 of the label 1 against the stainless steel plate (SUS-304) 31 were measured as follows.

[0049] First, rectangular labels were prepared by cutting the labels of Example 3 and Comparative Example 1. The rectangular labels had a width of 100 mm in the MD (Machine Direction) direction and a width of 80 mm in the TD (Transverse Direction) direction.

[0050] Next, a tensile tester 35 as shown in FIG. 3 is prepared. The tensile tester 35 is a tensile tester (AGS-50G) manufactured by Shimadzu Corporation or a similar tensile tester capable of performing measurements. The tensile tester 35 is equipped with a wire 32, a load cell 33, a horizontally installed test stand 34, and a pulley 36 located above the test stand 34. The test stand 34 is made of a non-magnetic metal to prevent the effects of static electricity. The pulley 36 can rotate smoothly and is installed at a height and position where the wire 32 and the surface of the test stand 34 are parallel.

[0051] Next, as shown in FIG. 4, the stainless steel plate 31 is placed on a test stand 34 .

[0052] Next, a weight 37 having a square bottom of 63 mm × 63 mm and a mass of 200 g ± 2 g (1.96 N ± 0.02 N) is prepared. Then, the back surface 1b (the surface opposite the aqueous printing layer 13) of the base layer 11 of the label 1 is attached to the bottom surface of the weight 37 so as not to cause wrinkles in the label 1. The label 1 is attached so that the center of the bottom surface of the weight 37 is positioned at the center of the back surface 1b of the base layer 11 of the label 1.

[0053] Next, the label 1 is attached to one end of a wire 32 connected to a load cell 33. The wire 32 is not taut, but has a little slack.

[0054] Next, the label 1 attached to the bottom surface of the weight 37 is gently placed so that its aqueous print layer 13 (front surface 1a) is in contact with the stainless steel plate 31 (parallel to the surface of the test stand 34).

[0055] Next, as shown in Figure 4, the load cell 33 pulled the wire 32 via the pulley 36 in the direction of the arrow 38, parallel to the surface of the test bench 34, at a speed of 100 mm / min for a distance of 85 mm, thereby measuring the static and dynamic friction forces of the aqueous printing layer 12 against the stainless steel plate. The measurement results are shown in Table 3. The dynamic friction force shown in Table 3 is the average value of the dynamic friction force over a movement distance of 10 mm to 85 mm.

[0056] The measurement conditions for the static friction force and dynamic friction force are based on JIS K 7125: 1999. The measurement temperature and humidity for the static friction force and dynamic friction force are based on JIS K 7100 standard temperature condition class 2 (temperature: 23±2°C, relative humidity: 50±10%).

[0057] [Table 3]

[0058] The results shown in Table 3 show that the coefficients of friction (static and dynamic) for the label of Example 3, in which the amount of silicone in the aqueous print layer (matte print layer) was reduced, were equivalent to those for the label of Comparative Example 1, in which the aqueous print layer contained a similar amount of silicone. Therefore, it was confirmed that the label of Example 3, in which the amount of silicone in the aqueous print layer was reduced, had sufficient slip properties.

[0059] <Summary> The following will exemplify the above-described embodiments of the present invention.

[0060] (1) a substrate layer; an aqueous printing layer provided on at least one surface of the base layer; The amount of silicone contained in the aqueous printing layer is 0.05 to 0.5 mg / m 2 It is a long label.

[0061] (2) The substrate layer is a resin film, the aqueous printing layer includes a matte printing layer containing a matting agent, The amount of silicone contained in the matte printing layer is 0.05 to 0.5 mg / m 2 The label of claim 1,

[0062] (3) The label according to claim 1, wherein the label is fed in a strip shape having the aqueous printing layer, and the label is run for 1000 m with the aqueous printing layer in contact with the surface of a fixed metal rod, and then when observing deposits on the surface of the metal rod, substantially no deposits are observed. [Explanation of symbols]

[0063] 1 Label 1a Front 1b back side 11 Base material 12 Water-based printing layer 13 Water-based printing layer (matt printing layer, etc.) 31 Stainless steel plate 32 wires 33 Load Cell 34 Test Stand 35 Tensile testing machine 36 Pulley 37 Weight 38 Arrow 4 metal rod

Claims

1. a substrate layer; an aqueous printing layer provided on at least one surface of the base layer; The amount of silicone contained in the aqueous printing layer is 0.05 to 0.5 mg / m ２ It is a long label.

2. the substrate layer is a resin film, the aqueous printing layer includes a matte printing layer containing a matting agent, The amount of silicone contained in the matte printing layer is 0.05 to 0.5 mg / m ２ The label of claim 1 ,

3. 2. The label according to claim 1, wherein the label is fed in a strip shape having the aqueous printing layer, and the label is run for 1000 m with the aqueous printing layer in contact with the surface of a fixed metal rod, and then when observing deposits on the surface of the metal rod, substantially no deposits are observed.

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