JP6230897B2 - Cylindrical stretch label - Google Patents

Description

  The present invention relates to a cylindrical stretch label.

  Like other labels, the cylindrical stretch label includes a printing layer that displays a product name, a design, a product description, and the like, and plays a role of increasing the purchase intention of the product. The cylindrical stretch label is fitted to the product container in a state of being stretched by being pulled in the circumferential direction of the cylindrical body, and thereafter, when the pulling force is removed, the tubular stretch label is contracted by an elastic force and attached to the container. For this reason, it is requested | required that a cylindrical stretch label should be excellent in extensibility and restoring | restoration property (collectively these are called stretch property). As an example of a cylindrical stretch label, Patent Document 1 discloses a label having inner and outer surface layers made of an ethylene vinyl acetate copolymer on both surfaces of a base material made of low density polyethylene.

  By the way, after forming a long film base material in which a printing layer etc. were formed into a cylindrical body, a cylindrical stretch label makes the said cylindrical body (henceforth "a cylindrical long body") individual. Manufactured by cutting to label size. Examples of the apparatus used for cutting the cylindrical elongated body include a guillotine cutter including a fixed blade and a movable blade that can move forward and backward with respect to the fixed blade, and a rotary cutter shown in FIGS. In addition, it is common that a cylindrical elongate body is cut before mounting | wearing with a container etc. in a stretch labeler (label mounting machine).

  A rotary cutter 100 shown in FIG. 4 (a diagram viewed from one side in the width direction of the cylindrical elongated body 200) includes a fixed blade 101 and a rotary blade 102 that is a movable blade. The rotary cutter 100 is disposed on the upstream side of the stretch labeler, for example. The cylindrical long body 200 is supplied to the labeler in a state of being folded into a flat shape and wound into a roll, and is passed between the fixed blade 101 and the rotary blade 102 by the feeding roller 103 or the like. In the rotary cutter 100, the rotary blade 102 rotates so as to feed the cylindrical long body 200 to the downstream side, and the cylindrical shape is sandwiched between two blades when the cutting edge of the rotary blade 102 approaches the fixed blade 101. It is cut so that the long body 200 is pushed out.

  A rotary cutter 150 shown in FIG. 5 (a diagram viewed from one side in the longitudinal direction of the cylindrical elongated body 200) includes a disk-shaped rotary blade 151 that revolves on a path 153 while rotating about a shaft 152. As in the example shown in FIG. 4, the cylindrical long body 200 is supplied to the labeler in a state of being folded flat, and is fed out so as to pass through the vicinity of the path 153 where the rotary blade 151 revolves. Then, the rotating blade 151 that rotates is moved across the tubular elongated body 200 in the width direction, and cuts the tubular elongated body 200.

Japanese Patent No. 3197131

  As described above, the cylindrical stretch label is manufactured by cutting the cylindrical elongated body 200, but at the time of the cutting, so-called cut fusion in which the inner surfaces of the labels are joined may occur. In particular, when the guillotine cutter or the rotary cutter 100 shown in FIG. 4 is used, cut fusion is likely to occur due to, for example, the influence of frictional heat or pressing during cutting. For example, in the rotary cutter 100 shown in FIG. 4, cut fusion is likely to occur at the upstream opening of the cylindrical stretch label.

  In order to suppress the occurrence of the cut fusion, it is conceivable to use a rigid and hard film base material. In this case, when the film is mounted on the container (when the label is stretched), It becomes easy to generate | occur | produce the crack of a printing layer, and the tear of a film base material. Such inconvenience occurs particularly when the temperature is low.

  That is, an object of the present invention is to provide a cylindrical stretch label that can suppress the occurrence of cut fusion and is less likely to cause cracking of the printed layer and tearing of the film substrate at the label folding position. is there.

  The cylindrical stretch label which concerns on this invention is provided with the film base material and the printing layer formed in the at least one surface of the said film base material, The cylindrical stretch by which the said film base material was shape | molded by the cylindrical body In the label, the film base material is a mixed resin of linear low density polyethylene and low density polyethylene, and a base layer composed mainly of a mixed resin having a higher mixing ratio of the latter than the former, and the base layer And a surface layer having a density equal to or higher than that of the base layer formed mainly of low density polyethylene, and the thickness of the surface layer with respect to the total thickness of the film base is 2 to 25 %.

In the cylindrical stretch label according to the present invention, the density of the linear low density polyethylene constituting the base layer is 0.885 to 0.925 g / cm ^3, and the density of the low density polyethylene constituting the base layer is 0.00. It is suitable to set it as 910-0.940g / cm < ³ >.

In the cylindrical stretch label according to the present invention, it is preferable that the density of the surface layer is 0.910 to 0.945 g / cm ³ .

In the cylindrical stretch label according to the present invention, it is preferable that the density of the low density polyethylene constituting the surface layer is 0.920 to 0.945 g / cm ³ .

  ADVANTAGE OF THE INVENTION According to this invention, generation | occurrence | production of cut fusion | fusion can be suppressed, and the cylindrical stretch label which does not generate | occur | produce the crack of the printing layer in the folding position of a label and the tear of a film base material can be provided. Moreover, according to the cylindrical stretch label which concerns on this invention, even if it is a case where cut fusion | fusion has generate | occur | produced, a fusion | melting state can be eliminated easily.

It is a perspective view of the cylindrical stretch label which is an example of embodiment of this invention. It is sectional drawing of the cylindrical stretch label which is an example of embodiment of this invention. It is a figure which shows the elongate body of the cylindrical stretch label which is an example of embodiment of this invention. It is a figure which shows an example of a rotary cutter. It is a figure which shows another example of a rotary cutter.

  Hereinafter, the cylindrical stretch label 10 which is an example of embodiment of this invention is demonstrated in detail, referring drawings. The drawings referred to in the embodiments are schematically described, and the dimensional ratios of components drawn in the drawings should be determined in consideration of the following description.

  1 and 2 show a cylindrical stretch label 10 comprising a film substrate 11 and a printed layer 12 formed on at least one surface of the substrate, and the film substrate 11 is formed into a cylindrical body. Show. In the tubular stretch label 10, the film base 11 is a base layer 20 composed mainly of a mixed resin of linear low density polyethylene and low density polyethylene and having a higher mixing ratio of the latter than the former. And a surface layer formed on at least the inner surface of the base layer 20 and having a density equal to or higher than the base layer 20 composed mainly of low density polyethylene, and the thickness of the surface layer relative to the total thickness of the film substrate 11 is 2% to 25%.

In the present specification, “low density” of low density polyethylene means 0.850 to 0.945 g / cm ³ .

  Here, the thickness of the surface layer means the thickness of one surface layer formed on at least the inner surface of the base layer 20. That is, when the surface layer is formed on both surfaces of the base layer 20, the thickness of each surface layer is 2% to 25% of the total thickness of the film substrate 11.

  In the present specification, of the surface of the film substrate 11, the surface facing the inner side of the cylindrical body is referred to as “inner surface”, and the surface facing the outer side of the cylindrical body is referred to as “outer surface”. The terms “inner surface” and “outer surface” are used not only for the film substrate 11 but also for the base layer 20 and the like described later. The surface facing the outside of the body is called the “outer surface”. In addition, the expression “form a layer on the inner surface and the outer surface” is not limited to the case where the layer is directly formed on the inner surface and the outer surface, unless otherwise specified. It is intended to include the case where a layer is interposed.

  The cylindrical stretch label 10 includes the film base 11 and the printing layer 12 as described above. The print layer 12 may be formed on either the inner surface or the outer surface of the film substrate 11 or may be formed on both surfaces. In the example shown in FIG. 2, the printing layer 12 is formed on the inner surface of the film substrate 11 from the viewpoint of suppressing damage to the printing layer 12. Further, the printing layer 12 may be formed in a desired pattern on the inner surface of the film substrate 11 or may be formed in substantially the entire inner surface.

  The cylindrical stretch label 10 is formed into a cylindrical body by overlapping and joining the edges of the film base material 11 on which the printing layer 12 is formed to form a seal portion 13. When the film base 11 is formed into a cylindrical shape and one end edge is overlapped on the outside of the other end edge, the seal portion 13 is positioned at one end edge of the film base 11 positioned outside the overlap portion. And the outer surface of the other edge of the film substrate 11 located inside can be joined with an adhesive. The seal portion 13 can be formed not only by bonding using an adhesive but also by bonding using heat sealing or bonding using ultrasonic waves. Moreover, when forming the seal part 13, in order to improve adhesiveness, it is suitable to join film base materials directly, without interposing other layers, such as the printing layer 12, in the seal part 13. FIG. The sealing portion 13 is not limited to a so-called envelope-bonding joining mode in which the inner surface of one end edge of the film base material 11 and the outer surface of the other end edge are joined. It may be a so-called joint-attached joining form in which the inner surfaces of the edges are joined together or the outer surfaces are joined together.

  The film substrate 11 is a substrate having stretch properties, and has a base layer 20 and a surface layer. The surface layer is a layer constituting the outermost surface of the film substrate 11. In the present embodiment, the surface layer includes an inner surface layer 21 formed on the inner surface of the base layer 20 and an outer surface layer 22 formed on the outer surface of the base layer 20. The film substrate 11 may have a two-layer structure having only the base layer 20 and the inner surface layer 21, but preferably has the base layer 20 as a central layer and has the inner surface layer 21 and the outer surface layer 22 on both sides thereof. At least a three-layer structure. The film substrate 11 may be provided with another layer between the base layer 20 and the surface layer as long as the object of the present invention is not impaired.

  Although the thickness of the film base material 11 is not specifically limited, It is preferable that it is 50-200 micrometers, More preferably, it is 60-150 micrometers, Especially preferably, it is 65-120 micrometers.

  The base layer 20 imparts a good stretch property to the film base 11 and suppresses the cracking of the printing layer 12 and the tearing of the film base 11 at a fold position described later (fold line 31: see FIG. 3). Fulfill. The base layer 20 is composed mainly of a mixed resin of linear low density polyethylene (LLDPE) and low density polyethylene (LDPE) having a higher mixing ratio of the latter than the former. The content of the mixed resin is at least 50% by weight, preferably 70% by weight or more, more preferably 80% by weight or more, and particularly preferably 90% by weight based on the total weight of all the components constituting the base layer 20. %, And the upper limit may be 100% by weight. The mixing ratio (weight ratio) of the linear low density polyethylene and the low density polyethylene is preferably the former: the latter = 5: 95 to 45:55, more preferably 6:94 to 40:60, and 7:93 to 30: 70 is particularly preferable, and 10:90 to 25:75 is most preferable.

  The content of the linear low density polyethylene in the base layer 20 is preferably 5 to 35% by weight, more preferably 6 to 30% by weight, and more preferably 7 to 25% by weight based on the total weight of all components constituting the base layer 20. % Is particularly preferable, and 10 to 20% by weight is most preferable. The content of the low density polyethylene in the base layer 20 is preferably 60 to 95% by weight, more preferably 65 to 94% by weight, and 70 to 93% by weight with respect to the total weight of all components constituting the base layer 20. Particularly preferred is 75 to 90% by weight. In addition, when using 2 or more types together as each polyethylene, the total of the polyethylene used together should just be in this range.

  The base layer 20 has a single layer structure composed mainly of a mixed resin of linear low density polyethylene and low density polyethylene. Further, the base layer 20 may have a multilayer structure including a plurality of layers mainly composed of a mixed resin. When the base layer portion 20 has a multilayer structure, a multilayer structure including a plurality of layers in which the mixing ratio of the linear low density polyethylene and the low density polyethylene is changed may be used, or a plurality of layers may be formed using these two polyethylenes and other resin components. A multilayer structure including these layers may be used. The thickness of the base layer 20 is not particularly limited, but is preferably 30 to 150 μm, more preferably 40 to 110 μm, and particularly preferably 50 to 100 μm. The thickness of the base layer 20 is preferably 50% or more, more preferably 60% or more, and particularly preferably 65% or more with respect to the total thickness of the film substrate 11.

  The linear low density polyethylene constituting the base layer 20 is a low density polyethylene that is polymerized under medium or low pressure or high pressure using various catalysts such as Ziegler catalyst, chromium catalyst, metallocene catalyst, etc. It has a structure in which a large number of short side chains are introduced into a polyethylene. Linear low density polyethylene is a copolymer of ethylene and an α-olefin having 3 to 20 carbon atoms. The α-olefin is particularly preferably an α-olefin having 4 to 8 carbon atoms such as 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene and 1-octene. The content of the α-olefin component is preferably 1 to 20% by weight, more preferably 2 to 15% by weight, particularly preferably 5 to 10% by weight, based on the total weight of the monomer components. . The linear low density polyethylene is particularly preferably polymerized using a metallocene catalyst. These linear low density polyethylene may be used independently and may use 2 or more types together.

The density of the linear low density polyethylene is preferably 0.885~0.925g / cm ^3, more preferably 0.890~0.920g / cm ^3, 0.900~0.920g Particularly preferred is / cm ³ . When using 2 or more types of linear low density polyethylene, the total density of all the linear low density polyethylenes should just be in this range. If the density is within this range, even better stretch characteristics can be obtained, and cracking of the printed layer 12 at the folding position can be easily suppressed.

  The MFR (190 ° C., 2.16 kg) of the linear low density polyethylene is preferably 1 to 30 g / 10 minutes, more preferably 1 to 20 g / 10 minutes, and 1 to 10 g / 10 minutes. It is particularly preferred. When using 2 or more types of linear low density polyethylene, the total MFR of all the linear low density polyethylenes should just be in this range. If the MFR is within this range, the productivity will be good.

  The linear low-density polyethylene is a monomer component other than ethylene and the α-olefin, for example, vinyl carboxylate such as vinyl acetate (VA), acrylic acid (AA), etc., as long as the object of the present invention is not impaired. (Meth) acrylic acid ester, such as unsaturated carboxylic acid and methyl methacrylate (MMA), may be contained. However, it is preferable that the linear low-density polyethylene does not contain monomer components other than ethylene and the α-olefin.

  A commercial item can be used for the said linear low density polyethylene. Applicable commercially available products include, for example, “715FT, 0540F, 1540F, 2540F” manufactured by Ube Maruzen Polyethylene Co., Ltd., “FV201, FV203, FV401, FV405” manufactured by Sumitomo Chemical Co., Ltd., Japan Polyethylene Co., Ltd. “UF240, UF442” and the like made by the manufacturer are listed.

  The low density polyethylene constituting the base layer 20 is a low density polyethylene that is polymerized under high pressure using a peroxide or the like as a catalyst, and is also called a high pressure polyethylene. Low density polyethylene has a branched structure in which many irregular side chains are introduced. The low density polyethylene is a copolymer of ethylene and an α-olefin having 3 to 20 carbon atoms, like the homopolymer of ethylene or the linear low density polyethylene. These low density polyethylenes may be used alone, but preferably two or more types having different densities are used in combination.

The density of the low density polyethylene is preferably 0.910~0.940g / cm ^3, more preferably 0.915~0.935g / cm ^3, 0.920~0.930g / cm ³ is particularly preferred. When using 2 or more types of low density polyethylene, the total density of all the low density polyethylenes should just be in this range. If the density is within this range, better stretch characteristics can be obtained, and cracking of the printing layer 12 at the folding position can be easily suppressed.

When two types of low density polyethylene are used, one density is preferably 0.920 g / cm ³ or more and less than 0.930 g / cm ³ , and the other density is 0.930 to 0.940 g / cm ³ (0 930 g / cm ³ or more and 0.940 g / cm ³ or less).

  The MFR (190 ° C., 2.16 kg) of the low density polyethylene is preferably 1 to 30 g / 10 minutes, more preferably 1 to 20 g / 10 minutes, and 1 to 10 g / 10 minutes. Is particularly preferred. When using 2 or more types of low density polyethylene, the total MFR of all the low density polyethylenes should just be in this range. If the MFR is within this range, the productivity will be good. (The same applies to the low-density polyethylene constituting the inner surface layer 21 described later.)

  The low-density polyethylene is a monomer component other than ethylene and the α-olefin, for example, vinyl carboxylate such as vinyl acetate (VA), unsaturated acid such as acrylic acid (AA), etc., as long as the object of the present invention is not impaired. (Meth) acrylic acid esters such as carboxylic acid and methyl methacrylate (MMA) may be contained (the same applies to the low-density polyethylene constituting the inner surface layer 21 described later). However, it is preferable that the low density polyethylene used for the base layer 20 does not contain monomer components other than ethylene and the α-olefin.

  A commercial item can be used for the said low density polyethylene. Applicable commercial products include, for example, “F234, F222NH, F522N, Z372” manufactured by Ube Maruzen Polyethylene Co., Ltd., “F200, F412-1” manufactured by Sumitomo Chemical Co., Ltd., and manufactured by Nippon Polyethylene Co., Ltd. “SF941, SF8402” and the like.

Overall density of the base layer 20 is preferably 0.900~0.935g / cm ^3, more preferably 0.910~0.935g / cm ^3, 0.915~0.930g / more preferably cm ^3, and particularly preferably 0.920~0.930g / cm ^3. The base layer 20 contains resin components other than low-density polyethylene and linear low-density polyethylene, and various additives such as plasticizers, lubricants, waxes, antistatic agents and the like within a range that does not impair the object of the present invention. May be.

  The inner surface layer 21 is a surface layer constituting the innermost surface of the film substrate 11 formed on the inner surface of the base layer 20 and plays a role of suppressing cut fusion. The inner surface layer 21 is composed mainly of low-density polyethylene and has an appropriate stretch property. The content of the low density polyethylene is at least 50% by weight, preferably 55% by weight or more, more preferably 60% by weight or more, and particularly preferably 70% by weight with respect to the total weight of the resin components constituting the inner surface layer 21. %, And the upper limit may be 100% by weight. When using 2 or more types of low density polyethylene, the total of all the low density polyethylenes should just be in this range.

  The inner surface layer 21 may be formed only at a cut position 32 (see FIG. 3), which will be described later, but is preferably formed over the entire inner surface of the base layer 20 from the viewpoint of productivity and the like. The thickness of the inner surface layer 21 is 2 to 25%, preferably 3 to 20%, more preferably 5 to 17% with respect to the total thickness of the film substrate 11. For example, the thickness of the inner surface layer 21 is preferably 2 to 25 μm, more preferably 3 to 20 μm, and particularly preferably 5 to 18 μm.

  The low density polyethylene constituting the inner surface layer 21 is a low density polyethylene polymerized under high pressure using a peroxide or the like as a catalyst, like the low density polyethylene constituting the base layer 20, and has irregular side chains. It has many branched structures. The low density polyethylene is a homopolymer of ethylene or a copolymer of ethylene and an α-olefin having 3 to 20 carbon atoms. These low density polyethylenes may be used independently and may use 2 or more types together.

If the density of the inner surface layer 21 is equal to or higher than the density of the base layer 20, the low density polyethylene constituting the inner surface layer 21 is more than the resin having the same density as the low density polyethylene constituting the base layer 20 or the base layer 20. Although a low density resin may be used, a resin having a higher density than the low density polyethylene of the base layer 20 is preferably used. The density of low-density polyethylene constituting the inner surface layer 21 is preferably 0.920~0.945g / cm ^3, more preferably 0.925~0.940g / cm ^3, 0.930~ Particularly preferred is 0.940 g / cm ³ . When using 2 or more types of low density polyethylene, the total density of all the low density polyethylenes should just be in this range. If the density is within this range, relatively good stretch characteristics can be obtained, and cut fusion can be easily suppressed.

  The inner surface layer 21 may contain other resins in addition to the low density polyethylene. For example, since the low density polyethylene used for the inner surface layer 21 is a relatively hard resin, another resin that constitutes the inner surface layer 21 together with the low density polyethylene is a resin having higher flexibility than the low density polyethylene. is there. Examples of the highly flexible resin include styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SIS), and styrene-butadiene / isoprene-styrene block copolymer (SBIS). And styrene-diene copolymers such as ethylene-vinyl acetate copolymer (EVA), and EVA is particularly preferable. When low density polyethylene and EVA are used in combination as the inner surface layer 21, even when the inner surfaces of the cylindrical stretch label 10 are cut and fused together, it is preferable because the fusion can be peeled off with a weak force. The inner surface layer 21 may contain linear low density polyethylene (LLDPE) as long as the object of the present invention is not impaired. However, when LLDPE is used in a large amount for the purpose of imparting flexibility, cut fusion is caused. The inner surface layer 21 does not contain LLDPE, or even when it is contained, its content is small (for example, less than 5% by weight) because it tends to be generated and the fusion force tends to increase. It is preferable.

  When the inner surface layer 21 is composed of low density polyethylene and EVA, the content of EVA is more than 0% by weight and not more than 50% by weight, preferably with respect to the total weight of the resin components constituting the inner surface layer 21. Is 1 to 45% by weight, more preferably 5 to 40% by weight, and particularly preferably 10 to 30% by weight. The content of the vinyl acetate component with respect to the entire resin constituting the inner surface layer 21 is preferably 0.1 to 10% by weight, and more preferably 0.5 to 6% by weight.

  A commercially available product can be used as the resin constituting the inner surface layer 21. Applicable commercial products include, for example, “F234, F222NH, F522N, Z372” manufactured by Ube Maruzen Polyethylene Co., Ltd., “F200, F412-1” manufactured by Sumitomo Chemical Co., Ltd., Nippon Polyethylene as low density polyethylene. “SF941, SF8402” manufactured by Co., Ltd. and the like can be mentioned. Examples of EVA include “V206” manufactured by Ube Maruzen Polyethylene Co., Ltd., “LV1511” manufactured by Nippon Polyethylene Co., Ltd., and the like.

The total density of the inner surface layer 21 is equal to or higher than the density of the base layer 20, and is preferably higher than the density of the base layer 20. Specifically, it is preferable that a 0.910~0.945g / cm ^3, more preferably 0.915 to 0.940 g / cm ^3, is 0.920~0.935g / cm ³ more preferably, and particularly preferably not more than 0.935 g / cm ³ greater than the 0.920 g / cm ^3. The inner surface layer 21 may contain various additives such as a plasticizer, a lubricant, a wax, and an antistatic agent.

  The outer surface layer 22 is a surface layer that constitutes the outermost surface of the film substrate 11 that is optionally formed on the outer surface of the base layer 20, and plays a role of improving durability (damage resistance) during manufacture and use. Fulfill. The outer surface layer 22 may be made of any material as long as it does not impair the stretchability of the film substrate 11, but is more preferably composed mainly of low-density polyethylene and has an appropriate stretchability. The content of the low density polyethylene is at least 50% by weight, preferably 55% by weight or more, more preferably 60% by weight or more, and particularly preferably 70% by weight with respect to the total weight of the resin components constituting the outer surface layer 22. %, And the upper limit may be 100% by weight. When using 2 or more types of low density polyethylene, the total of all the low density polyethylenes should just be in this range.

  The outer surface layer 22 is preferably formed over the entire outer surface of the base layer 20. The thickness of the outer surface layer 22 is 2 to 25% with respect to the total thickness of the film substrate 11, preferably 3 to 20%, more preferably 5 to 17%. For example, the thickness of the outer surface layer 22 is preferably 2 to 25 μm, more preferably 3 to 20 μm, and particularly preferably 5 to 17 μm.

  For the low density polyethylene constituting the outer surface layer 22, the same resin as exemplified by the low density polyethylene constituting the inner surface layer 21 can be used. Similarly to the inner surface layer 21, the outer surface layer 22 may be formed using a mixed resin of low density polyethylene, a styrene-diene copolymer, or an ethylene-vinyl acetate copolymer (EVA), It is preferable to form the outer surface layer 22 using a mixed resin of low-density polyethylene and EVA. In this embodiment, the inner surface layer 21 and the outer surface layer 22 are formed with the same resin composition, and the physical properties (density, thickness, etc.) are substantially the same.

  For example, the print layer 12 is a layer for displaying a product name, an illustration, a product description, and the like, and is formed in a desired pattern on the inner surface or the outer surface of the film substrate 11 or on both the inner surface and the outer surface. In the present embodiment, the printing layer 12 is formed on the inner surface of the inner surface layer 21 of the film substrate 11. Although the thickness of the printing layer 12 is not specifically limited, Preferably it is 0.1-10 micrometers. Although the print layer 12 is easily cracked at the folding position, the crack is suppressed by the function of the base layer 20.

  Before the printing layer 12 is formed into a cylindrical body with one surface of the film substrate 11 as an inner surface, the printing layer 12 is coated with printing ink on one surface, the other surface, or both surfaces, and dried. It is formed by solidifying the applied ink. For the formation of the printing layer 12, for example, a desired color material such as a pigment or dye, a binder resin such as an acrylic resin or a urethane resin, an organic solvent, and various additives (for example, a plasticizer, a lubricant, a wax, a charge) Solvent type ink containing an inhibitor) is used as printing ink. And using this printing ink, the printing layer 12 can be formed by printing by well-known thru | or usual printing methods, such as a gravure printing method, a flexographic printing method, or a relief printing method. The printing layer 12 is a layer in which a coloring material such as a desired pigment or dye is dispersed in a binder resin such as an acrylic resin or a urethane resin, or a layer in which a coloring material is bound by a binder resin. Any additives may be contained.

  The cylindrical stretch label 10 may be provided with a layer other than the printing layer 12 as long as the stretch property is not affected. For example, a protective layer may be provided on the printing layer 12. Further, when the printing layer 12 is formed on the outer surface of the film substrate 11, a protective layer may be provided on the printing layer. Further, even when the printing layer 12 is not formed on the outer surface of the film substrate 11, a transparent overcoat layer is provided on the outer surface of the film substrate 11 for the purpose of imparting slipperiness or preventing scratches. It may be provided. The protective layer and the overcoat layer can be formed by a known or conventional printing method using a known or conventional ink, for example, a binder resin such as an acrylic resin or a urethane resin, an organic solvent, and various additives (for example, It can be formed using a solvent-type transparent ink containing a plasticizer, a lubricant, a wax, an antistatic agent or the like, or a transparent ink further containing a colorant that does not impair transparency. The protective layer or the overcoat layer is a layer made of a binder resin such as an acrylic resin or a urethane resin, for example, and may contain any additive or a color material that does not impair the transparency. When formed on the outer surface of the film substrate 11, the protective layer and the overcoat layer are preferably transparent.

  Here, the manufacturing method of the cylindrical stretch label 10 is illustrated.

  A series of manufacturing steps of the cylindrical stretch label 10 includes a step of producing a first long body which is a long body of the film substrate 11 (hereinafter referred to as a step (a)), and a printing layer on the first long body. Forming the second elongated body by forming the second elongated body (hereinafter referred to as step (b)), and forming the cylindrical elongated body by molding the second elongated body (hereinafter referred to as the step (b)). And a step (c)), and a step (hereinafter referred to as a step (d)) of producing a cylindrical stretch label 10 by cutting a cylindrical elongated body into individual label sizes.

First, the step (a) will be described.
A 1st elongate body can be produced by a conventionally well-known film formation method, for example, a melt extrusion method. In the melt extrusion method, the raw material resin constituting the base layer 20, the first surface layer that becomes the inner surface layer 21, and the second surface layer that becomes the outer surface layer 22 is put into an extruder and melted, and the molten resin is T-die. The molten resin in the form of a thin film is extruded from a die slit onto a casting drum cooled and solidified by cooling. Although extrusion temperature is not specifically limited, About 180 to 240 degreeC is preferable and 200 to 220 degreeC is more preferable. As a method of laminating each layer, for example, either a feed block method in which a feed block is installed immediately before the T die and each molten resin is supplied to the T die in a laminar flow state or a multi manifold method using a multi-layer manifold is applied. May be. Thus, a first long body (for example, a first long body wound in a roll shape) having a laminated structure of the first surface layer / base layer 20 / second surface layer is produced.

  Note that the first elongate body may have a layer structure including the first surface layer that becomes the inner surface layer 21 and the base layer 20 and does not have the second surface layer that becomes the outer surface layer 22. Moreover, although the said 1st elongate body is an unstretched film, it may be extended | stretched in the range which does not impair stretch property. Further, the first long body (or the second long body) may be subjected to surface treatment such as corona treatment or flame treatment, or a surface layer such as an antistatic coating layer, a protective layer or an overcoat layer. A layer other than the base layer 20 may be provided.

Next, step (b) will be described.
In the step (b), the first elongated body is supplied to a printing machine or the like in the form of a roll and continuously conveyed in the MD direction (longitudinal direction of the elongated body) while one surface or the other of the first elongated body. The printing layer 12 is formed on one side or both sides. As described above, the printing layer 12 can be formed by a gravure printing method or the like. Thus, the 2nd elongate body (for example, the 2nd elongate body wound up by roll shape) by which printing layer 12 was formed in one side of the 1st elongate body, the other side, or both sides ). In the present embodiment, the print layer 12 is formed on the first surface layer.

Next, step (c) will be described.
In the step (c), the second elongated body on which the printing layer 12 is formed is formed into a cylindrical elongated body. A 2nd elongate body is made into a cylindrical elongate body by overlapping the both ends of TD direction and forming the seal part 13 so that TD direction (width direction of a elongate body) may become a circumferential direction. The seal portion 13 can be formed by, for example, an adhesive seal or a heat seal. The seal portion 13 is formed to have a length of about 0.5 to 5 mm in the circumferential direction of the cylindrical body. Before forming the second long body into a cylindrical shape, it is preferable to slit the MD direction so as to have a predetermined width in the TD direction to adjust the circumferential length of the cylindrical long body. is there.

  FIG. 3 shows the cylindrical elongated body 30 produced by the step (c). The cylindrical elongated body 30 is produced by forming the seal portion 13 so that the first surface layer faces the inside of the cylindrical body. The seal portion 13 is formed along the MD direction of the cylindrical elongated body 30. Thus, the first surface layer becomes the inner surface layer 21. Moreover, since the printing layer 12 is formed on the first surface layer, the printing layer 12 is provided inside the cylindrical body.

  The cylindrical elongated body 30 is preferably folded into a flat shape from the viewpoints of storability, transportability, and the like. For example, the cylindrical elongated body 30 is folded after forming the seal portion 13 into a cylindrical shape. For this reason, two crease lines 31 substantially parallel to the seal portion 13 are formed in the cylindrical elongated body 30. The flat cylindrical long body 30 folded along the crease line 31 is wound into a roll shape, for example, and stored and transported in a roll form.

Next, process (d) is demonstrated.
In the step (d), the cylindrical elongated body 30 is cut into individual label sizes to produce the cylindrical stretch label 10. The cylindrical long body 30 is generally supplied to a stretch labeler (label mounting machine) in the form of the roll and cut in the labeler. For example, the cut shown by a dotted line before being mounted on a container or the like. Cut at position 32. Thus, the cylindrical elongated body 30 is divided into a plurality of cylindrical stretch labels 10. The cylindrical elongated body 30 is cut into individual label sizes by a guillotine cutter or a rotary cutter while being continuously conveyed in the MD direction. In addition, you may form a perforation line in the cylindrical stretch label 10 by a conventional method.

  Here, the effect of the cylindrical stretch label 10 (tubular elongate body 30) is demonstrated.

  As described above, the tubular elongated body 30 is formed with a crease line 31 by being folded into a flat shape. The cylindrical elongated body 30 has a large stress applied to the film substrate 11 and the printing layer 12 in the portion where the crease line 31 is formed, but the diameter of the cylindrical elongated body 30 is increased by providing the base layer 20 having a predetermined composition. The crack of the printed layer 12 and the tear of the film base material 11 in the folding position at the time of doing are suppressed.

  As described above, the cylindrical elongated body 30 is cut into individual label sizes using various cutters such as a guillotine cutter and a rotary cutter. At this time, for example, due to frictional heat at the time of cutting, the influence of pressing, and the like, it becomes a situation where cut fusion in which the inner surfaces of the cylindrical elongated body 30 are joined easily occurs. In particular, the guillotine cutter that is pushed out and the rotary cutter having the mechanism shown in FIG. 4 tend to be cut and fused easily. Since the cylindrical long body 30 is provided with the inner surface layer 21 having a predetermined composition, the occurrence of the cut fusion can be suppressed. Moreover, even if cut fusion occurs, the degree of fusion is small and can be easily separated. For this reason, the cylindrical long body 30 can be used not only for a stretch labeler equipped with a cutter that is difficult to cut and fuse, but also for a stretch labeler equipped with a cutter that is relatively easy to cut and fuse, and has excellent versatility.

  That is, by using the film base material 11 (first elongated body) having the specific base layer 20 and the specific inner surface layer 21, it is possible to suppress the occurrence of cut fusion, and at the label folding position. It becomes possible to suppress the crack of the printing layer 12 and the tear of the film base material 11.

  The cylindrical stretch label 10 is attached to an adherend such as a container using, for example, a stretch labeler. The stretch labeler expands the label so that it becomes slightly larger than the maximum perimeter of the label mounting location such as a container (for example, a container). And the adherend is inserted into the inside of the expanded diameter cylinder. When the stretcher is removed and the pulling force is removed in a state where the adherend is fitted inside the cylindrical stretch label 10, the label is elastically contracted and attached to the container or the like. The cylindrical stretch label 10 is preferably attached in a state of being stretched in the circumferential direction by at least about 2%.

  Here, the stretch characteristic of the cylindrical stretch label 10 is demonstrated.

  The stretch characteristic of the cylindrical stretch label 10 can be expressed by tensile stress or instantaneous strain. The tensile stress is a tensile resistance force acting on the tensile tester when the evaluation sample is pulled at a predetermined test speed by the tensile tester and is extended by a predetermined amount. That is, the force resists stretching, and the smaller the tensile stress, the easier the label is stretched and the higher the stretchability. As for the instantaneous strain (%), the evaluation sample was deformed without returning to the original length when the tensile resistance was returned to zero at the predetermined test speed after the tensile test extended by the predetermined amount at the predetermined test speed. Degree (deformation amount / original length of evaluation sample). The predetermined test speed in the tensile test is 50 mm / min. It means that the smaller the instantaneous distortion, the higher the recoverability of the label. That is, the smaller the tensile stress and the instantaneous strain, the better the stretch characteristics.

  The cylindrical stretch label 10 is preferably capable of stretching at least 25% in the circumferential direction. The cylindrical stretch label 10 has an instantaneous strain (50 mm / min) after 25% elongation in the circumferential direction of preferably 10% or less, more preferably 8% or less, and particularly preferably 5% or less. Note that the lower limit of the instantaneous distortion is ideally 0%, but is actually 0%.

The cylindrical stretch label 10 has a tensile stress (hereinafter referred to as F10 value) of at least 10% in the circumferential direction, preferably 3 to 12 N / mm ² , more preferably 5 to 10 N / mm ^2. Particularly preferably, it is 6 to 8 N / mm ² . If the lower limit value of the F10 value is too low, the container tightening force becomes too weak in the stretched state, and a good-looking wearing state may not be obtained.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further, this invention is not limited to these Examples.

<Example 1>
For the production of the film substrate, an extruder having a merging method of feed block type 2 and 3 layer type was used. The following raw resin (base layer raw material, inner surface layer and outer surface layer raw material) was charged into two extruders heated to 210 ° C. and melted, and then the inner layer layer and outer surface layer raw materials were laminated on both sides of the base layer raw material. It is fed to a die and extruded from a slit onto a casting drum cooled to 25 ° C. in two types and three layers to rapidly cool and solidify, and a long film body (three layers of inner layer / base layer / outer layer) A first long body was obtained. The base layer had a density of 0.923 g / cm ³ and a thickness of 90 μm. Each of the inner surface layer and the outer surface layer had a density of 0.923 g / cm ³ and a thickness of 5 μm. The overall density of the film substrate (first long body) was 0.922 g / cm ³ and the thickness was 100 μm. Table 1 shows the thickness, density, raw material resin, and the like of each layer.

[Raw resin]
The base layer material: density (FV203 manufactured by Sumitomo Chemical Co.), a linear low-density polyethylene 0.913 g / cm ³ 20% by weight, low-density polyethylene (Sumitomo Chemical's density 0.921 g / cm ³ (strain) F412-1) 50% by weight, low density polyethylene having a density of 0.934 g / cm ³ (Z372 made by Ube Maruzen Polyethylene Co., Ltd.) 25% by weight, lubricant (amide type, density 0.922 g / cm ³ ) 5% by weight
The inner surface layer and outer layer material: (F200 manufactured by Sumitomo Chemical Co.) density low density polyethylene 0.924 g / cm ³ 70 wt% of ethylene having a density of 0.920 g / cm ³ - vinyl acetate copolymer ( Ube Maruzen Polyethylene Co., Ltd. V206) 30% by weight

Next, with a gravure printing machine, medium ink (transparent) and solvent-based ink (black, indigo, etc.) while conveying the long body in the MD direction to one surface (inner surface of the inner surface layer) of the first long body. Print layer (film base / color / medium / silver / white / white, color, color, 4 colors red, yellow, silver, white), and then medium, silver, white, white Were formed in order to obtain a second elongated body. Next, the edges of the second elongated body along the MD direction are overlapped so that the inner layer faces the inside of the cylindrical body, and a seal portion is formed using an adhesive, thereby forming a cylindrical shape. Thus, a cylindrical elongated body A1 was obtained. The tubular long body A1 was folded into a flat shape and wound into a roll. Thereby, two crease lines were formed along the MD direction in the cylindrical elongated body A1.
A cylindrical stretch label B1 was obtained by cutting the cylindrical elongated body A1 using a stretch labeler (STS-1916 manufactured by Fujia Tech Co., Ltd.) having a rotary cutter (cutting mechanism shown in FIG. 4).

  About the cylindrical long body A1 and the cylindrical stretch label B1, the stretch characteristics, cut fusion, mounting suitability, and printing layer cracking (for the printing layer cracking, use the first long body for the following measurement methods. The evaluation results are shown in Table 1.

<Evaluation of stretch properties>
A rectangular sample piece having a length of 15 ± 0.1 mm in the axial direction and a length of 200 mm in the circumferential direction (distance between marked lines of 100 ± 2 mm) was produced from the cylindrical stretch label B1. Using the long side direction (circumferential direction of the cylindrical stretch label) of the sample piece as a measurement direction, a 25% tensile test was performed to measure instantaneous strain (%). The 25% tensile test is a crosshead speed constant type or pendulum type tensile tester (test speed: 50 ± 5 mm / min), and a predetermined load (N) is applied to the distance between the marked lines of the sample pieces. This test was extended to 25%. The distance between the marked lines when reading was returned to 0 (N) at the same test speed after extension was performed, and the instantaneous strain (%) was calculated by the following formula.
Instantaneous strain (%) = 100 × ΔL2 / L2
L2: Distance between marked lines of sample piece before test (mm)
ΔL2: Increase in distance between marked lines of sample piece after test (mm)

  In the tensile test, a stress-strain curve showing the relationship between the tensile stress and the elongation (strain) of the sample piece is obtained. From the obtained stress strain curve, the F10 value, which is the tensile stress when the sample piece was stretched by 10% (value when stretched), was determined.

<Evaluation of cut fusion>
Put the hand with your finger closed into the cylindrical body from the axial direction one side (downstream side) of the cylindrical stretch label B1 obtained by cutting with the above stretch labeler. The degree of opening of the other side (upstream side) of the label B1 in the axial direction was confirmed by sensory evaluation.
○ (No cut fusion): Open easily × (With cut fusion): There was a large resistance when opening

<Evaluation of wearing suitability>
The cylindrical stretch label B1 obtained by cutting with the above stretch labeler is attached to the container at a speed of 300 sheets / minute using the above stretch labeler, and label opening failure due to label folding and cut fusion is confirmed. did.
○: No label folding or defective opening ×: Label folded or defective opening

<Evaluation of printing layer cracking>
A rectangular sample piece having a length of 70 mm ± 0.1 mm in the MD direction and a length of 15 mm ± 0.1 mm in the TD direction was produced from the first long body. The sample piece was evaluated according to the following procedure.
(1) Fold it flat so that the printing surfaces of the sample pieces overlap, and use a press (heat seal tester TP-701-B manufactured by Tester Sangyo Co., Ltd.) to step at room temperature, 0.3 MPa, 3 seconds, I made a crease.
(2) Set the sample at 20mm between chucks on the autograph set at 5 ° C centering on the crease, leave it to the set temperature, and leave it at the set temperature of 5mm (equivalent to 25% elongation) I pulled.
(3) About the sample removed from the autograph after being pulled, the state of the printed layer in the fold was confirmed by visual observation and observing the printed surface with a CCD camera (magnification 100 to 200 times).
○: No crack in the printed layer was confirmed ×: Cracked in the printed layer was confirmed

<Example 2>
Except for changing the thickness of the base layer raw material, the surface layer (inner surface layer and outer surface layer), and the base layer as described below, the first elongate body, the cylindrical elongate body A2, A cylindrical stretch label B2 was produced.
The base layer material: density linear low density polyethylene 0.913 g / cm ³ (manufactured by Sumitomo Chemical (Co.) FV203) 10 wt%, low density polyethylene (Ube Maruzen Polyethylene (strain density 0.922 g / cm ³ F222NH) 75% by weight, low density polyethylene having a density of 0.934 g / cm ³ (Z372 made by Ube Maruzen Polyethylene Co., Ltd.) 10% by weight, same lubricant (amide type) as in Example 1 5% by weight
The thickness of the base layer was 70 μm, and the thicknesses of the inner surface layer and the outer surface layer were each 15 μm.
Moreover, it carried out similarly to Example 1, and evaluated the stretch characteristic, the cut fusion | fusion, and the printing layer crack (it is the same also about Examples 3-5).

<Example 3>
Except having changed the base layer raw material, the inner surface layer, and the outer surface layer raw material as follows, a first long body, a cylindrical long body A3, and a cylindrical stretch label B3 were produced in the same manner as in Example 2. .
The base layer material: density linear low density polyethylene 0.913 g / cm ³ (manufactured by Ube Maruzen Polyethylene (Ltd.) 715FT) 20 wt% low density polyethylene having a density of 0.922 g / cm ³ (Ube Maruzen Polyethylene ( F222NH) 45% by weight, low density polyethylene with a density of 0.934 g / cm ³ (Z372 made by Ube Maruzen Polyethylene Co., Ltd.) 20% by weight, same lubricant (amide) as in Example 1 5% by weight
The inner surface layer and outer layer material: density 0.934g / cm (Z372 made by Ube Maruzen Polyethylene Co.) low density polyethylene ³ 70 wt%, a density of 0.920 g / cm ³ ethylene - vinyl acetate copolymer (V206 manufactured by Ube Maruzen Polyethylene Co., Ltd.) 30% by weight

<Example 4>
Except having changed the base layer raw material, the inner surface layer, and the outer surface layer raw material as follows, a first long body, a cylindrical long body A4, and a cylindrical stretch label B4 were produced in the same manner as in Example 1. .
The base layer material: density linear low density polyethylene 0.913 g / cm ³ (manufactured by Ube Maruzen Polyethylene (Ltd.) 715FT) 20 wt% low density polyethylene having a density of 0.922 g / cm ³ (Ube Maruzen Polyethylene ( F222NH) 5% by weight, low density polyethylene with a density of 0.934 g / cm ³ (Z372 made by Ube Maruzen Polyethylene) 70% by weight, same lubricant (amide) 5% by weight as in Example 1
The inner surface layer and outer layer material: density 0.934g / cm (Z372 made by Ube Maruzen Polyethylene Co.) low density polyethylene ³ 70 wt%, a density of 0.920 g / cm ³ ethylene - vinyl acetate copolymer (V206 manufactured by Ube Maruzen Polyethylene Co., Ltd.) 30% by weight

<Example 5>
Except having changed the base layer raw material as follows, it carried out similarly to Example 4, and produced the 1st elongate body, cylindrical elongate body A5, and the cylindrical stretch label B5.
Base layer raw material: 20% by weight of linear low density polyethylene (0540F manufactured by Ube Maruzen Polyethylene Co., Ltd.) having a density of 0.904 g / cm ³ , low density polyethylene (Ube Maruzen polyethylene (Ube Maruzen polyethylene)) having a density of 0.922 g / cm ³ F222NH) 45% by weight, low density polyethylene having a density of 0.934 g / cm ³ (Z372, Ube Maruzen Polyethylene Co., Ltd.) 30% by weight, same lubricant (amide) 5% by weight as in Example 1

<Comparative Example 1>
The first elongate body and the cylindrical elongate body are the same as in Example 5 except that the layer structure (film base material) of the first elongate body is a single layer structure (thickness 100 μm) of only the base layer. X1 and cylindrical stretch label Y1 were produced.
Further, in the same manner as in Example 1, cut fusion, mounting suitability, and cracks in the printed layer were evaluated. The evaluation results are shown in Table 2. In addition, it has not evaluated about the stretch characteristic (it is the same also about Comparative Examples 2-6).

<Comparative example 2>
Except having changed the base layer raw material as follows, it carried out similarly to Example 4, and produced the 1st elongate body, the cylindrical elongate body X2, and the cylindrical stretch label Y2.
The base layer material: density low density polyethylene 0.922 g / cm ³ (manufactured by Ube Maruzen Polyethylene Co. F222NH) 55 wt%, a density of 0.934 g / cm ³ low-density polyethylene (Ube Maruzen Polyethylene Co. Z372) 40% by weight, same lubricant as in Example 1 (amide type) 5% by weight

<Comparative Example 3>
Except for changing the thickness of the base layer raw material, the surface layer (inner surface layer and outer surface layer) and the base layer as described below, the first elongated body, the cylindrical elongated body X3, A cylindrical stretch label Y3 was produced.
The base layer material: density linear low density polyethylene 0.913 g / cm ³ (manufactured by Ube Maruzen Polyethylene (Ltd.) 715FT) 20 wt% low density polyethylene having a density of 0.922 g / cm ³ (Ube Maruzen Polyethylene ( F222NH) 45% by weight, low density polyethylene having a density of 0.934 g / cm ³ (Z372, Ube Maruzen Polyethylene Co., Ltd.) 30% by weight, same lubricant (amide) 5% by weight as in Example 1
The thickness of the base layer was 33 μm, and the thicknesses of the inner surface layer and the outer surface layer were 33 μm, respectively.

<Comparative Example 4>
A first elongated body, a cylindrical elongated body X4, and a cylindrical stretch label Y4 are produced in the same manner as in Comparative Example 2 except that the thickness of the base layer raw material, the surface layer, and the base layer is changed as follows. did.
The base layer material: density linear low density polyethylene 0.913 g / cm ³ (manufactured by Ube Maruzen Polyethylene (Ltd.) 715FT) 60 wt% and a density of low density polyethylene (Ube Maruzen Polyethylene 0.922 g / cm ³ ( F222NH) 30% by weight, low density polyethylene having a density of 0.934 g / cm ³ (Z372 made by Ube Maruzen Polyethylene Co., Ltd.) 5% by weight, same lubricant (amide) 5% by weight as in Example 1
The thickness of the base layer was 60 μm, and the thickness of the inner surface layer and the outer surface layer was 20 μm.

<Comparative Example 5>
A first long body, a cylindrical long body X5, and a cylindrical stretch label Y5 were produced in the same manner as in Comparative Example 4 except that the base layer raw material, the inner surface layer, and the outer surface layer raw material were changed as follows. .
The base layer material: density linear low density polyethylene 0.913 g / cm ³ (manufactured by Ube Maruzen Polyethylene (Ltd.) 715FT) 20 wt% low density polyethylene having a density of 0.922 g / cm ³ (Ube Maruzen Polyethylene ( F222NH) 70% by weight, low density polyethylene with a density of 0.934 g / cm ³ (Z372 made by Ube Maruzen Polyethylene Co., Ltd.) 5% by weight, same lubricant (amide) 5% by weight as in Example 1
The inner surface layer and outer layer material: density (Z372 made by Ube Maruzen Polyethylene Co.) low density polyethylene 0.934 g / cm ³ 30% by weight, a density of 0.920 g / cm ³ ethylene - vinyl acetate copolymer (V206 manufactured by Ube Maruzen Polyethylene Co., Ltd.) 70% by weight

  DESCRIPTION OF SYMBOLS 10 Cylindrical stretch label, 11 Film base material, 12 Print layer, 13 Seal part, 20 Base layer, 21 Inner surface layer, 22 Outer surface layer, 30 Cylindrical elongate body, 31 Fold line, 32 Cut position

Claims (4)

A film substrate;
A printed layer formed on at least one surface of the film substrate;
In a cylindrical stretch label in which the film substrate is formed into a cylindrical body,
The film substrate is
A base layer composed of a mixed resin of linear low density polyethylene and low density polyethylene, the main component of which is a mixed resin having a higher mixing ratio of the latter than the former;
A surface layer formed on at least the inner surface of the base layer and having a density equal to or higher than the base layer composed mainly of low density polyethylene;
A cylindrical stretch label in which the thickness of the surface layer is 2 to 25% with respect to the total thickness of the film substrate. The density of the linear low density polyethylene constituting the base layer is 0.885 to 0.925 g / cm ³ , and the density of the low density polyethylene constituting the base layer is 0.910 to 0.940 g / cm ³ . The cylindrical stretch label of Claim 1 which exists. The cylindrical stretch label according to claim 1 or 2, wherein the density of the surface layer is 0.910 to 0.945 g / cm ³ . The cylindrical stretch label of any one of Claims 1 thru | or ³ whose density of the low density polyethylene which comprises the said surface layer is 0.920-0.945g / cm < ³ >.

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