Marking film and method for producing marking film

Abstract

To provide a marking film in which the occurrence of edge lifting can be suppressed even when time has elapsed after cutting.SOLUTION: In a marking film 1, a release liner 30 is configured by containing a pigment component on at least a surface of base paper 33 on an adhesive layer 20 side, and the adhesive layer includes an intrusion portion 21 that intrudes into a groove of the base paper formed when the marking film is cut into a predetermined mark.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a marking film and a method for manufacturing the marking film. [Background technology]

[0002] A marking film is a colored film that is cut into the shape of a mark such as a letter or a figure and attached to a sign, a wall, a car body, etc. A marking film generally has a base layer, an adhesive layer, and a release liner.

[0003] When forming a predetermined mark on a marking film, a known cutting plotter or the like is used. Specifically, the cutting plotter is used to cut the base layer and the adhesive layer into the predetermined mark shape, and the waste portion other than the mark is removed (hereinafter referred to as waste removal). Then, an application tape is applied to the predetermined mark, and the application tape with the transferred predetermined mark is applied to an adherend, and only the application tape is peeled off, leaving the predetermined mark on the adherend.

[0004] During the above-described scrap removal, there are cases where a predetermined mark (for example, a character) is peeled off together with the scrap (hereinafter referred to as "co-removal").

[0005] In response to this, for example, Patent Document 1 listed below discloses a marking film in which the release liner is composed of a silicone release agent, a polyethylene film, fine paper, and a curl prevention resin layer. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 10-140101 Summary of the Invention [Problem to be solved by the invention]

[0007] The inventors discovered that in the case of conventional marking films such as those described in Patent Document 1, the release liner contains a polyethylene layer, so co-rising does not occur immediately after cutting, but the adhesive layers re-adhere over time after cutting, causing co-rising to occur.

[0008] The present invention was invented to solve the above-mentioned problems, and aims to provide a marking film and a method for manufacturing a marking film that can suppress the occurrence of co-rising even after time has passed after cutting. [Means for solving the problem]

[0009] The above object of the present invention can be achieved by the following means.

[0010] (1) A marking film having a base layer, a pressure-sensitive adhesive layer, and a release liner laminated in this order, The release liner is The adhesive sheet is configured by including a pigment component on at least the surface of the base paper facing the pressure-sensitive adhesive layer, The marking film, wherein the adhesive layer has an intrusion portion that intrudes into a groove in the base paper that is formed when the base paper is cut into a predetermined mark.

[0011] (2) The marking film according to (1), wherein the release liner contains the pigment component on both sides in the lamination direction of the base paper.

[0012] (3) The marking film according to (1) or (2), wherein the pigment is clay.

[0013] (4) The amount of the clay contained on one side is 5 to 10 g / m 2 The marking film according to (1) or (2),

[0014] (5) a preparation step of preparing a laminate comprising a base layer, a pressure-sensitive adhesive layer, and a release liner configured by incorporating a pigment component into at least the surface of the base paper facing the pressure-sensitive adhesive layer; a cutting step of cutting the laminate into predetermined marks by inserting a blade from the base layer side, A method for manufacturing a marking film, wherein during the cutting step, the adhesive layer penetrates into grooves in the base paper that are created during the cutting step. [Effects of the Invention]

[0015] According to the marking film described above, the adhesive layer has an intrusion portion that intrudes into the grooves in the base paper that are formed when the marking film is cut to the predetermined mark. Therefore, even after time has passed since cutting, the adhesive force between the intrusion portion and the base paper is stronger than the force that would break the re-adhered adhesive layer, thereby preventing the occurrence of co-rising. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a cross-sectional view showing a marking film according to an embodiment of the present invention. [Figure 2] 1 is a schematic cross-sectional view showing a release liner of a marking film according to an embodiment of the present invention. [Figure 3] 1 is an SEM photograph showing a cross section of the marking film according to the present embodiment, showing the state before scrap removal. [Figure 4] 1 is an SEM photograph showing a cross section of the marking film according to the present embodiment, showing the state after scrap removal. [Figure 5] 1 is an SEM photograph showing a cross section of a marking film according to a comparative example, showing the state before scrap removal. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same elements are given the same reference numerals, and duplicate explanations will be omitted. Furthermore, the dimensional proportions in the drawings are exaggerated for the convenience of explanation and may differ from the actual proportions.

[0018] The configuration of the marking film 1 according to this embodiment will be described with reference to Figures 1 to 4. Figure 1 is a cross-sectional view of the marking film 1 according to this embodiment. Figure 2 is a schematic cross-sectional view of the release liner 30 of the marking film 1 according to this embodiment. Figure 3 is an SEM photograph showing a cross-section of the marking film 1 according to this embodiment, showing the state before scrap removal. Figure 4 is an SEM photograph showing a cross-section of the marking film 1 according to this embodiment, showing the state after scrap removal.

[0019] The marking film 1 is attached to an adherend for purposes such as advertising, guidance, or decoration, and may include information displays or decorations composed of, for example, colors, letters, images, etc. The shape of the marking film 1 is not particularly limited, and may be, for example, a simple geometric shape such as a circle or a rectangle, a letter shape such as cut-out letters, or a shape modeled after a mascot character or an anime character.

[0020] The adhesive strength of the marking film 1 is preferably 2 N / 25 mm or more, more preferably 4 N / 25 mm or more, and even more preferably 5 N / 25 mm or more. When the adhesive strength of the marking film 1 is above the above lower limit, adhesion to the adherend is ensured. The marking film 1 needs to be attached to the adherend for a long period of time, so a certain degree of adhesiveness is required. There is no particular upper limit for the adhesive strength, but it is 15 N / 25 mm or less.

[0021] As shown in Fig. 1, the marking film 1 has a base layer 10, an adhesive layer 20, and a release liner 30. In Fig. 1, the marking film 1 is a laminate having the base layer 10, the adhesive layer 20, and the release liner 30 in this order, but other intermediate layers may be present on the base layer 10 and / or between the base layer 10 and the adhesive layer 20, as long as the adhesive layer 20 is exposed when the marking film 1 is attached to an adherend.

[0022] The base layer 10 may be provided with information display or decorations made up of colors, letters, images, etc.

[0023] For example, a vinyl chloride resin can be used for the base layer 10. Examples of vinyl chloride resins include polyvinyl chloride; copolymers mainly composed of vinyl chloride, such as ethylene-vinyl chloride copolymer, vinyl acetate-vinyl chloride copolymer, and vinyl chloride-halogenated olefin copolymer; and blends of copolymers mainly composed of polyvinyl chloride or vinyl chloride copolymer with other resins (for example, polyester resin, epoxy resin, acrylic resin, vinyl acetate resin, urethane resin, acrylonitrile-styrene-butadiene copolymer, partially saponified polyvinyl alcohol, etc.).

[0024] The thickness of the base layer 10 is not particularly limited, but is preferably 10 to 300 μm, more preferably 30 to 200 μm, from the viewpoint of the strength and handleability of the base layer.

[0025] The adhesive used in the adhesive layer 20 is not particularly limited, and may be an acrylic adhesive, a synthetic rubber adhesive, a silicone adhesive, a urethane adhesive, etc. The above adhesives may be used alone or in combination of two or more.

[0026] From the viewpoint of adhesive reliability, an acrylic adhesive is particularly suitable for use as the adhesive. The acrylic polymer constituting the acrylic adhesive is formed by using a (meth)acrylic acid alkyl ester as the main monomer component and, as necessary, a monomer copolymerizable with the (meth)acrylic acid alkyl ester (copolymerizable monomer).

[0027] Examples of (meth)acrylic acid alkyl esters include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, butyl (meth)acrylate, isobutyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, cyclohexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate, normal octyl (meth)acrylate, decyl (meth)acrylate, dodecyl (meth)acrylate, myristyl (meth)acrylate, palmityl (meth)acrylate, and stearyl (meth)acrylate. These may be used alone or in combination of two or more.

[0028] It is preferable to use a monomer having a crosslinkable functional group as a monomer copolymerizable with the (meth)acrylic acid alkyl ester (copolymerizable monomer). Specific examples include hydroxyl group-containing monomers such as hydroxyalkyl (meth)acrylates, such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, and 4-hydroxybutyl (meth)acrylate; carboxyl group-containing monomers such as (meth)acrylic acid, itaconic acid, maleic acid, and fumaric acid; and amino group-containing monomers such as aminoethyl (meth)acrylate and (meth)acryloylmorpholine.

[0029] Other copolymerizable monomers include vinyl acetate and styrene.

[0030] The weight-average molecular weight of the acrylic polymer is not particularly limited, but is preferably 100,000 to 1,000,000. The weight-average molecular weight is a polystyrene-equivalent value measured by gel permeation chromatography (GPC).

[0031] The pressure-sensitive adhesive preferably contains a crosslinking agent in addition to the acrylic polymer. Examples of the crosslinking agent include an isocyanate crosslinking agent, an epoxy crosslinking agent, and a metal chelate crosslinking agent. The amount of the crosslinking agent added is preferably 0.001 to 10 parts by mass, and more preferably 0.01 to 3.0 parts by mass, per 100 parts by mass of the acrylic polymer.

[0032] If necessary, the adhesive layer 20 may contain appropriate additives such as tackifiers, ultraviolet absorbers, antioxidants, antistatic agents, emulsifiers, leveling agents, antifoaming agents, and preservatives.

[0033] The thickness of the adhesive layer 20 is not particularly limited, but is preferably in the range of 10 to 50 μm from the viewpoint of adhesiveness and thinning.

[0034] As shown in Figure 2, the release liner 30 has a base paper 33, coating layers 32 and 34 formed on both sides of the base paper 33, and a release agent layer 31 formed on the upper surface of the coating layer 32. Note that although Figure 2 clearly shows boundaries between the coating layer 32 and the base paper 33, and between the coating layer 34 and the base paper 33, in reality they are formed integrally so that no boundaries exist.

[0035] The release agent layer 31 is formed by applying a release agent such as silicone.

[0036] The coating layers 32, 34 are formed on both sides of the base paper 33. Here, for example, if a coating layer is formed on one side of the base paper, moisture absorption and release from the base paper 33 may occur, which may cause the release liner 30 to unintentionally curl. In contrast, the release liner 30 of the marking film 1 according to this embodiment has coating layers formed on both sides of the base paper, which can prevent curling. Note that a configuration in which a coating layer is formed on one side of the base paper is also included in the present invention.

[0037] The coating layer contains a pigment and a binder resin.

[0038] As the pigment, for example, clay, heavy calcium carbonate, light calcium carbonate, talc, titanium dioxide, aluminum hydroxide, mica, and the like can be used alone or in combination of two or more. Of the above pigments, clay is preferably used from the viewpoint of high smoothness when a layer is formed on the base paper due to its scaly shape.

[0039] Examples of clays that can be used include kaolin, talc, bentonite, smectite, vermiculite, mica, chlorite, kibushi clay, gairome clay, halloysite, and mica. Among these, kaolin is preferred. The shape of the clay is not particularly limited, but from the viewpoint of smoothness, a flat plate shape is preferred. The average particle size of the clay is not particularly limited, but is, for example, 0.1 μm or more and 10 μm or less. The average particle size is based on volume and can be measured using a laser diffraction particle size distribution analyzer.

[0040] When the clay is flat, the ratio of the average particle size to the average thickness, i.e., the aspect ratio, is preferably 3.0 or more, more preferably 5.0 or more, and even more preferably 7.0 or more, and the upper limit of the aspect ratio of the clay may be 10.0 or less.

[0041] From the viewpoint of smoothness and binding property, the clay content is preferably 60 to 85% by mass, more preferably 70 to 80% by mass. Specifically, the clay content is, for example, 0.5 to 20 g / m 2 and 5 to 10 g / m 2 For example, the amount of pigment is preferably 0.5 g / m 2 If the amount of pigment is less than 20 g / m, the paper becomes less smooth and is more likely to curl due to the influence of moisture in the air, which is undesirable. 2 If the amount is larger than this, the pigment tends to fall off, which is not preferable.

[0042] The mass ratio of the binder resin to the clay is preferably 15% by mass or more, and more preferably 30% by mass or more. When the mass ratio of the binder resin to the clay is equal to or greater than the lower limit, the resin can adequately fill gaps formed by the clay, suppressing penetration of the release agent layer applied thereon and further improving smoothness. Taking into account the effects of the clay, the upper limit of the mass ratio of the binder resin to the clay is preferably 50% by mass or less, and more preferably 45% by mass or less.

[0043] The coating layer may contain other additives, such as pigment dispersants, defoamers, antifoaming agents, viscosity modifiers, lubricants, water-resistant agents, water retention agents, and colorants.

[0044] It is also preferable to subject the coated surface to a supercalender treatment to smooth the surface, as this improves the sealing effect and stiffening effect.

[0045] Here, for example, if the coating does not contain pigment and is composed only of binder resin, the binder resin has a relatively low viscosity, so the binder resin does not soak into the base paper and act as a sealing layer, and the silicone applied afterwards also soaks into the base paper and picks up the unevenness of the base paper, increasing the contact area and the peeling force. As a result, after the residue has been removed, it may not be easy to peel off the specified mark with application tape.

[0046] In contrast, by including a pigment, the surface becomes smooth and does not pick up the irregularities of the base paper, thereby suppressing an unintended increase in peel force.

[0047] Examples of binder resins used in the coating layer include copolymers such as styrene-butadiene copolymer, styrene-acrylic copolymer, ethylene-vinyl chloride copolymer, methyl methacrylate-butadiene copolymer, ethylene-vinyl acetate copolymer, and (meth)acrylic acid ester copolymer; and water-soluble resins such as casein, dextrin, starch, oxidized starch, carboxymethyl cellulose, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, and polyvinyl alcohol. These binder resins may be used alone or in combination of two or more. Among these, from the viewpoint of film-forming properties, the resin preferably contains a styrene-butadiene copolymer. Furthermore, the styrene-butadiene resin (styrene-butadiene copolymer) is preferably a latex type (styrene-butadiene rubber latex) because of its high solid content, low viscosity, and excellent productivity. The glass transition temperature of the styrene-butadiene resin is preferably −50° C. or higher and 50° C. or lower, more preferably −20° C. or higher and 20° C. or lower, from the viewpoint of ease of smoothing by pressure in the supercalendering process. The minimum film-forming temperature of the latex type (styrene-butadiene rubber latex) is preferably in the range of 10 to 150°C. The minimum film-forming temperature is the minimum temperature required to form a continuous film when the water content of the styrene-butadiene rubber latex evaporates and the styrene-butadiene rubber latex dries, and is obtained by the temperature gradient plate method. As the latex type of styrene-butadiene copolymer, commercially available products may be used, such as Smartex (registered trademark) SN-309R (styrene-butadiene rubber latex, manufactured by Nippon A&L, glass transition temperature 4°C), Smartex (registered trademark) SN-307R (styrene-butadiene rubber latex, manufactured by Nippon A&L, glass transition temperature 10°C), and JSR0693 (styrene-butadiene rubber latex, manufactured by JSR, glass transition temperature 20°C).

[0048] The base paper is mainly composed of wood pulp fibers, which may be suitably blended with chemical pulps such as softwood kraft pulp, hardwood kraft pulp, and sulfite pulp, mechanical pulps such as stone-grind pulp, thermomechanical pulp, and refiner-grind pulp, and recycled pulps obtained from newspapers, coated paper, and fine paper.

[0049] If necessary, fiber materials other than cellulose fibers, such as non-wood pulp from kenaf, hemp, bamboo, etc., glass fiber, polyethylene fiber, etc. may be blended.

[0050] When making the base paper, internal chemicals such as sizing agents, paper strength agents, fixing agents, retention aids, and dyes, and internal fillers such as talc, kaolin, titanium dioxide, aluminum hydroxide, and calcium carbonate may be added, or surface treatments may be appropriately performed during the papermaking process, such as applying paper strength agents such as starch and polyvinyl alcohol, surface sizing agents, and dyes using a size press, gate roll, or the like.

[0051] The method for applying the pigment-containing binder to the base paper can be appropriately selected from various coating devices such as a blade coater, an air knife coater, a rod blade coater, and a bar blade coater.

[0052] The method for applying the coating layer-forming composition to the substrate layer will be described below. A coating layer-forming composition is prepared by mixing a binder resin, clay, and, if necessary, additives and a solvent. The solvent is appropriately selected depending on the form of the binder resin. When the binder resin is a latex-type resin or a water-soluble polymer, the solvent is preferably water or an alcohol (e.g., ethanol, isopropanol, etc.), and more preferably water. One solvent may be used alone, or two or more solvents may be used in combination.

[0053] Thereafter, the base paper is coated with a coating layer-forming composition to form a coating layer. The coating method is not particularly limited, and a conventionally known method can be used, such as a method of applying a coating layer-forming composition containing a resin component to the base paper and drying it to form a coating layer. The coating method is not particularly limited, and can be, for example, a method of applying the coating using an appropriate coating device such as a blade coater, air knife coater, rod blade coater, bar blade coater, gravure coater, bar coater, multi-stage roll coater, roll coater, reverse roll coater, curtain coater, spray coater, gate roll coater, size press coater, or shim sizer.

[0054] From the viewpoint of effectiveness, the coating amount (solid content) of the coating layer-forming composition is preferably 2 to 30 g / m 2 , more preferably 3 to 20 g / m 2 After the coating layer-forming composition is applied, it may be subjected to a drying process. Drying conditions are set appropriately, for example, at 80 to 160°C for 10 to 60 seconds. A similar process is carried out on the opposite side of the base paper to form coating layers on both sides of the base paper.

[0055] Next, with reference to Figs. 3 and 4, the structure of the marking film 1 according to this embodiment when the base material layer 10 and the adhesive layer 20 are cut into predetermined marks by a cutting plotter will be described.

[0056] When the base layer 10 and the pressure-sensitive adhesive layer 20 are cut at predetermined marks using a cutting plotter, the cutting line L reaches the base paper 33 of the release liner 30 .

[0057] When scrap removal is performed after a predetermined time has elapsed in this state, as shown in Figure 4, scrap removal can be performed satisfactorily without causing co-removal. The reason for this is that the adhesive strength of the adhesive layer 20 to the base paper 33 is greater than the breaking strength required to break the adhesive layer 20 that has reattached after the predetermined time has elapsed.

[0058] After scrap removal, as shown in Figure 4, the adhesive layer 20 has an intrusion portion 21 that intrudes into the groove 33A of the base paper that was formed when the base paper was cut to the predetermined mark. Here, the adhesive strength between the adhesive intrusion portion 21 and the base paper 33 is greater than the breaking force that breaks the reattached adhesive layer 20, so that when scrap removal is performed, the base layer 10 and adhesive layer 20 on the side of the predetermined mark brace at the boundary between the adhesive layer 20 and the release liner 30, preventing the predetermined mark from being lifted together.

[0059] Next, the configuration of a marking film 900 according to a comparative example will be described with reference to Fig. 5. Fig. 5 is an SEM photograph showing a cross section of the marking film 900 according to the comparative example, showing the state before scrap removal. As shown in Fig. 5, the marking film 900 according to the comparative example has a base layer 10, a pressure-sensitive adhesive layer 20, and a release liner 930. The base layer 10 and the pressure-sensitive adhesive layer 20 have the same configuration as the marking film 1 according to the above-described embodiment, and therefore their description will be omitted.

[0060] The release liner 930 of the marking film 900 according to the comparative example has polyethylene layers 940 formed as sealing layers on both sides of the base paper, and a release agent layer such as silicone formed on the surface of the adhesive layer 20 of the release liner 930. The thickness of the polyethylene layer 940 is, for example, 20 to 25 μm.

[0061] Next, referring to Figure 5, we will explain the configuration of the marking film 900 of the comparative example when the base material layer 10 and adhesive layer 20 of the marking film 900 of the comparative example are cut into predetermined marks by a cutting plotter.

[0062] When the base layer 10 and adhesive layer 20 of the marking film 900 according to the comparative example are cut into predetermined marks using a cutting plotter, the cutting line does not reach the base paper but remains on the polyethylene layer 940.

[0063] When the scrap removal was performed in this state, the letters peeled off together, resulting in a co-removal. The reason for this is that the adhesive strength of the adhesive layer to the polyethylene layer 940 is weaker than the breaking strength required to break the reattached adhesive layer 20. [Example]

[0064] The effects of the present invention will be explained using the following examples and comparative examples. In the examples, the units "parts" or "%" may be used, but unless otherwise specified, they represent "parts by mass" or "% by mass." Unless otherwise specified, each operation is carried out at room temperature (25°C).

[0065] Example 1 1. A composition containing polyvinyl alcohol (saponification degree 98 mol%, molecular weight 75,000) and water in a specified ratio was applied to both sides of high-quality paper at a coating amount of 1.0 g / m 2 The coating was then applied and dried so that the coating amount was 5.2 g / m. Subsequently, a coating liquid containing 410 parts by mass of flat plate-like kaolin (average particle size 4.3 μm), 45 parts by mass of oxidized starch, 15 parts of polyvinyl alcohol (saponification degree 98 mol%, molecular weight 75,000), 80 parts of styrene-butadiene resin (styrene-butadiene rubber latex, glass transition temperature -3°C, minimum film formation temperature 100°C), and water as a solvent in a predetermined ratio was prepared. Next, the coating liquid was applied in a coating amount of 5.2 g / m. 2 The coating was applied to one side of the sheet so that the thickness of the coating was 1 / 3 of the original thickness, dried, and then passed through a super calendar roll to form a coating layer.

[0066] On the coating layer formed in 2.1, a coating liquid containing 100 parts by mass of a silicone release agent (KNS-3051 manufactured by Shin-Etsu Chemical Co., Ltd.) and 2 parts by mass of a catalyst (CAT-PL-56 manufactured by Shin-Etsu Chemical Co., Ltd.) was applied at a coating rate of 1.5 g / m 2 The coating was then cured at 150°C for 30 seconds to form a release agent layer, thereby obtaining a release paper.

[0067] 3. An acrylic adhesive composition was obtained by mixing 100 parts by mass (solid content) of an acrylic resin (n-butyl acrylate / acrylic acid=90 / 10), 30 parts by mass (solid content) of a rosin ester tackifier (softening point: 100°C), and 1.5 parts by mass (solid content) of an isocyanate crosslinking agent (Duranate D101 manufactured by Asahi Kasei Corporation, solid content 100% by mass).

[0068] The adhesive composition was applied in an amount of 20 g / m 2 The adhesive was applied to the release paper obtained in step 2 so that the adhesive layer surface was adhered to a vinyl chloride base material (thickness: 50 μm) that served as the base material layer, and the mixture was left to stand for one week in an environment of 23°C and 50% RH to produce an adhesive label.

[0069] <Comparative Example> As for 1. above, the same procedure as in Example 1 was carried out except that polyethylene (Novatec LD LC680 manufactured by Japan Polyethylene Co., Ltd.) was melt-extruded using a T-die to form a polyethylene layer on both sides of the high-quality paper to a thickness of 15 μm.

[0070] <Result> The characters "Aiuueo Aiueo" were cut out in 140pt Gothic font using a cutting plotter on the marking films according to the examples and comparative examples prepared as described above, and the scraps were removed immediately after cutting, 24 hours later, and 72 hours later. The results were evaluated on a 5-point scale, with 1: all characters removed, 2: 7 or more characters removed, 3: 5 or more characters removed, 4: 1 to 3 characters removed, and 5: no scraping.

[0071] [Table 1]

[0072] As can be seen from the above table, in the case of the marking film according to the example, no co-rising occurred immediately, 24 hours later, or 72 hours later. On the other hand, in the case of the marking film according to the comparative example, no co-rising occurred immediately, but co-rising occurred after 24 hours and 72 hours.

[0073] The marking film according to the present invention has been described above through the embodiments, but the present invention is not limited to the above-described embodiments and can be modified in various ways within the scope of the claims. [Explanation of symbols]

[0074] 1 marking film, 10 base material layer, 20 adhesive layer, 21 Intrusion part; 30 release liner, 33 Original paper.

Claims

1. A marking film having a base layer, a pressure-sensitive adhesive layer, and a release liner laminated in this order, The release liner is The adhesive sheet is configured by including a pigment component on at least the surface of the base paper facing the pressure-sensitive adhesive layer, The marking film, wherein the adhesive layer has an intrusion portion that intrudes into a groove in the base paper that is formed when the base paper is cut into a predetermined mark.

2. 2. The marking film according to claim 1, wherein the release liner contains the pigment component on both surfaces in the lamination direction of the base paper.

3. 3. The marking film according to claim 1, wherein the pigment is clay.

4. The amount of the clay contained on one side is 5 to 10 g / m ２ The marking film according to claim 1 or 2,

5. a preparation step of preparing a laminate comprising a base layer, a pressure-sensitive adhesive layer, and a release liner configured by incorporating a pigment component into at least the surface of the base paper facing the pressure-sensitive adhesive layer; a cutting step of cutting the laminate into predetermined marks by inserting a blade from the base layer side, A method for manufacturing a marking film, wherein during the cutting step, the adhesive layer penetrates into grooves in the base paper that are created during the cutting step.

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