JP2016188890A - Cylindrical stretch label - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cylindrical stretch label that can restrain occurrence of cut fusion and make it difficult for the printed layer in folding positions of the label to become cracked.SOLUTION: A cylindrical stretch label 10 comprises a film base material 11 and a printed layer 12 formed on at least one face of the base material. The film base material 11 is formed in a cylindrical shape. The film base material 11 contains low-density polyethylene and first linear low-density polyethylene, which is a copolymer of ethylene and 1-butene. A layer constituting the outermost face on the inner face side of the film base material 11 and of which the low-density polyethylene content is 50 or more wt.% to the total weight of the film base material 11 and the first linear low-density polyethylene content is 10 to 30 or more wt.% to the total weight of the film base material 11 contains low-density polyethylene of 50 or more wt.% to its total weight.SELECTED DRAWING: Figure 2

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), Cracks in the printed layer are likely to occur. Such inconvenience occurs particularly when the temperature is low.

  An object of the present invention is to provide a cylindrical stretch label that can suppress the occurrence of cut fusion and is less prone to cracking of the printed layer at the label folding position. In addition, the cylindrical stretch label is required to have good wearability to an article such as a container.

  The cylindrical stretch label which concerns on this invention is equipped 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 label by which the said film base material was shape | molded by the cylindrical body The film substrate includes low-density polyethylene and first linear low-density polyethylene that is a copolymer of ethylene and 1-butene, and the low-density polyethylene is based on the total weight of the film substrate. The content of the first linear low density polyethylene is 10 to 30% by weight, and the layer constituting the outermost surface on the inner surface side of the film base is based on the total weight And 50% by weight or more of the low density polyethylene.

  The cylindrical stretch label which concerns on this invention WHEREIN: The said film base material contains the 2nd linear low density polyethylene which is a copolymer of ethylene and C5-C20 alpha olefin, The said 2nd linear low density The polyethylene content is preferably 5 to 35% by weight based on the weight of the film substrate.

  In the cylindrical stretch label according to the present invention, the film base has a base layer and surface layers formed on both sides of the base layer, and the base layer is 70% by weight with respect to its total weight. Less than the low density polyethylene and 15 to 60% by weight of the first linear low density polyethylene, and the surface layer preferably contains 60% by weight or more of the low density polyethylene with respect to the total weight. . Further, the base layer preferably contains 5 to 40% by weight of the second linear low density polyethylene based on the total weight.

  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 a printing layer in the folding position of a label can be provided. Alternatively, even if cut fusion occurs, the fusion state can be easily eliminated. In addition, the cylindrical stretch label according to the present invention has good wearability to articles such as containers.

It is a perspective view of the cylindrical stretch label which is an example of embodiment. It is sectional drawing of the cylindrical stretch label which is an example of embodiment. It is a figure which shows the elongate body of the cylindrical stretch label which is an example of embodiment. 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, an example of an embodiment will be described in detail with reference to the 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.

In the present specification, “low density” of low density polyethylene means 0.850 to 0.945 g / cm ³ . Moreover, below, the surface which faced the inner side of the cylindrical body among the surfaces of the film base material 11 is called "inner surface", and the surface which faced the outer side of the cylindrical body is called "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. Of the surfaces of the base layer 20, the surface facing the inner side of the cylindrical body is “inner surface”, cylindrical 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 intervenes.

  As shown in FIG.1 and FIG.2, the cylindrical stretch label 10 is provided with the film base material 11 and the printing layer 12 formed in the at least one surface of the said base material, and the film base material 11 is a cylindrical body. It is a label molded into The film substrate 11 includes low-density polyethylene (LDPE) and first linear low-density polyethylene (first LLDPE) that is a copolymer of ethylene and 1-butene, and is based on the total weight of the film substrate 11. The low-density polyethylene content is 50% by weight or more, and the first linear low-density polyethylene content is 10 to 30% by weight. The content of the low density polyethylene is preferably 55 to 80% by weight, more preferably 60 to 75% by weight. The content of the first linear low density polyethylene is preferably 12 to 29% by weight. Moreover, the layer which comprises the outermost surface of the inner surface side of the film base material 11 contains 50 weight% or more of low density polyethylene with respect to the total weight, Preferably it is 60 weight% or more. In the example shown in FIG. 2, the inner surface layer 21 is a layer (innermost layer) constituting the outermost surface on the inner surface side of the film 11. Furthermore, it is preferable that the film base material 11 contains the 2nd linear low density polyethylene (2nd LLDPE) which is a copolymer of ethylene and C5-C10 alpha olefin. The content of the second linear low density polyethylene is preferably 5 to 35% by weight with respect to the total weight of the film substrate 11. The content of the second linear low density polyethylene is more preferably 8 to 25% by weight.

  The cylindrical stretch label 10 is formed into a cylindrical body by overlapping and joining the edges of the film base material 11 to form the 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. The film substrate 11 may have a single layer structure, but preferably has a multilayer structure. The film substrate 11 having a multilayer structure includes, for example, 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 example shown in FIG. 2, as the surface layer, an inner surface layer 21 formed on the inner surface of the base layer 20 (a layer constituting the outermost surface on the inner surface side of the film substrate 11) and an outer surface of the base layer 20 are formed. And an outer surface layer 22 (a layer constituting the outermost surface on the outer surface side of the film substrate 11). 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.

  When the film substrate 11 has a multilayer structure, the content of the low density polyethylene (LDPE), the first linear low density polyethylene (first LLDPE), and the second linear low density polyethylene (second LLDPE) It is calculated by summing up the components of all the layers of the substrate 11. The film base material 11 having a multilayer structure has a composition in which the content of each polyethylene (low density polyethylene, first linear low density polyethylene, second linear low density polyethylene) satisfies the above range as a whole. Each layer preferably has a composition described later. When using 2 or more types together as each polyethylene, the total of the polyethylene used together should just be in said range.

  The film base 11 having a single layer structure includes only one resin layer (hereinafter sometimes referred to as a single resin layer), and the resin layer constitutes the entire film base 11. The single resin layer has a low density polyethylene content of 50% by weight or more and a first linear low density polyethylene content of 10 to 30% by weight based on the total weight of the single resin layer. The content of the low density polyethylene is preferably 55 to 80% by weight, more preferably 60 to 75% by weight. The content of the first linear low density polyethylene is preferably 12 to 29% by weight. It is preferable that the single resin layer further includes a second linear low density polyethylene (second LLDPE). The content of the second linear low density polyethylene is preferably 5 to 35% by weight, more preferably 8 to 25% by weight, based on the total weight of the single resin layer. In the film substrate 11 having a single layer structure, the layers (innermost layer and outermost layer) constituting the outermost surfaces on the inner surface side and outer surface side of the film substrate 11 are both single resin layers. The film substrate 11 having a single layer structure composed of the single resin layer has a composition of the film substrate 11 having the specific composition, and a layer constituting the outermost surface on the inner surface side of the film substrate 11 is 50% by weight or more of low density polyethylene is included with respect to the total weight. Although the thickness of a single resin layer 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.

  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. When the film substrate 11 has a multilayer structure having a surface layer and a base layer 20, the thickness of the base layer 20 is preferably 30% to 98%, and preferably 40% to 90% with respect to the total thickness of the film substrate 11. % Is more preferable, and 50% to 80% is particularly preferable. The thickness of the surface layer is preferably 2% to 70%, more preferably 10% to 60%, and particularly preferably 20% to 50% of the total thickness of the film substrate 11. When the surface layer is formed on both surfaces of the base layer 20, the thickness of each surface layer (the thickness of the inner surface layer 21 and the thickness of the outer surface layer 22) is 1% to 35% of the total thickness of the film substrate 11, respectively. Preferably, 5% to 30% is more preferable, and 10% to 25% is particularly preferable.

  The base layer 20 preferably includes less than 70% by weight of low density polyethylene and 15-60% by weight of first linear low density polyethylene relative to its total weight. The base layer 20 imparts good stretchability to the film base material 11, suppresses the occurrence of cut fusion, improves easy cutability, and is at a fold position described later (fold line 31: see FIG. 3). It plays the role which suppresses the crack of the printing layer 12. FIG. On the other hand, the inner surface layer 21 and the outer surface layer 22 preferably include 60% by weight or more of low density polyethylene with respect to the total weight of each. The base layer 20 preferably has a higher content of linear low density polyethylene than the surface layer, and is particularly a resin layer having a low content of low density polyethylene and a high content of linear low density polyethylene. preferable.

  The content of the first linear low density polyethylene in the base layer 20 is more preferably 16 to 50% by weight, particularly preferably 17 to 45% by weight, based on the total weight of all components constituting the base layer 20. It is. The content of the low density polyethylene in the base layer 20 is more preferably 30 to 69% by weight, particularly preferably 35 to 65% by weight, based on the total weight of all components constituting the base layer 20.

  The base layer 20 preferably includes a second linear low density polyethylene in addition to the low density polyethylene and the first linear low density polyethylene. The content of the second linear low density polyethylene in the base layer 20 is preferably 5 to 40% by weight, more preferably 6 to 30% by weight, based on the total weight of all components constituting the base layer 20. 25% by weight is particularly preferred. Moreover, the base layer 20 may contain resin components other than low density polyethylene, 1st linear low density polyethylene, and 2nd linear low density polyethylene.

  The base layer 20 preferably has a single-layer structure composed of a mixed resin containing at least a low-density polyethylene and a first linear low-density polyethylene, preferably a second linear low-density polyethylene. However, the base layer 20 may have a multilayer structure including a plurality of layers. When the base layer 20 has a multilayer structure, it may have a multilayer structure including a plurality of layers having different mixing ratios of these polyethylenes, and a multilayer including a plurality of layers having different mixing ratios using these polyethylenes and other resin components. It is good also as a structure. Moreover, the layer which consists only of 1 type among each of these polyethylene may be formed, respectively, and you may laminate | stack so that the layers of these different resin compositions may adjoin. When the base layer 20 has a multilayer structure, the base layer 20 is preferably composed of 2 to 50 resin layers. The thickness of the base layer 20 is not particularly limited, but is preferably 20 to 150 μm, more preferably 25 to 110 μm, and particularly preferably 30 to 100 μm. In addition, when the base layer 20 has a multilayer structure, the content of each polyethylene in the base layer 20 is calculated by summing up each polyethylene in all layers of the base layer 20.

  The first linear low-density polyethylene is a low-density polyethylene that is polymerized under medium to low pressure or high pressure using various catalysts such as Ziegler catalyst, chromium catalyst, metallocene catalyst, etc. Have a structure in which many short side chains are introduced. A 1st linear low density polyethylene is a copolymer of ethylene and 1-butene as mentioned above, Comprising: The stretch property of the film base material 11, easy cut property, and a softness | flexibility are improved.

  The ethylene content in the first linear low density polyethylene is preferably from 80 to 99.9 mol%, more preferably from 85 to 99 mol%, particularly with respect to the total number of moles of the monomer components. Preferably it is 90-98 mol%. The content of 1-butene is preferably 0.1 to 20 mol%, more preferably 1 to 15 mol%, particularly preferably 2 to 10 mol, based on the total number of moles of the monomer components. %. The first linear low density polyethylene is particularly preferably polymerized using a metallocene catalyst. These first linear low density polyethylenes may be used alone or in combination of two or more.

  The second linear low density polyethylene, like the first linear low density polyethylene, is a low density polyethylene that is polymerized under medium or low pressure or high pressure using various catalysts such as a metallocene catalyst. It has a structure in which a large number of short side chains are introduced into a polyethylene. The second linear low density polyethylene is a copolymer of ethylene and an α-olefin having 5 to 20 carbon atoms as described above, and improves the stretchability and flexibility of the base layer 20.

  The α-olefin constituting the second linear low-density polyethylene is particularly preferably an α-olefin having 5 to 8 carbon atoms such as 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene. . The ethylene content in the second linear low-density polyethylene is preferably 80 to 99.9 mol%, more preferably 85 to 99 mol%, particularly with respect to the total number of moles of the monomer components. Preferably it is 90-98 mol%. The content of α-olefin is preferably 0.1 to 20 mol%, more preferably 1 to 15 mol%, particularly preferably 2 to 10 mol%, based on the total number of moles of monomer components. It is. These 2nd linear low density polyethylene may be used independently, and may use 2 or more types together.

Density of the respective 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 . 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 each 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. If the MFR is within this range, the productivity will be good.

  Each 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.

  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 preferably an ethylene homopolymer or a copolymer of ethylene and an α-olefin having 3 to 20 carbon atoms. The low-density polyethylene imparts appropriate hardness to the base layer 20 and improves easy cutting properties. These low density polyethylenes may be used alone or in combination of two or more having different densities.

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.

  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 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. 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.

The density of the base layer 20 is preferably 0.900~0.935g / cm ^3, more preferably ^{0.905~0.930g / cm 3, 0.910~0.925g / cm} 3 It is particularly preferred that Density of the surface layer (inner layer 21 and outer layer 22) is preferably 0.910~0.945g / cm ^3, more preferably 0.915~0.940g / cm ^3, 0. It is especially preferable that it is 920-0.935 g / cm < ³ >. Further, from the viewpoint of improving easy cutability, the density of the surface layer is preferably larger than the density of the base layer 20. And it is preferable that the whole density of the film base material 11 (when it is a single layer structure, the density of the said single resin layer) is 0.905-0.940g / cm < ³ >, 0.910-0. It is more preferably 935 g / cm ³ , and particularly preferably 0.915 to 0.930 g / 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 surface layers (the inner surface layer 21 and the outer surface layer 22) are composed of low-density polyethylene as a main component (a component having the largest content), have an appropriate stretch property, and have a firmness on the film substrate 11 to form a container. This improves the wearability to articles such as, and impact resistance during transportation. The content of the low density polyethylene is preferably 60% by weight or more based on the total weight of all the components constituting the surface layer as described above. It is particularly preferably 70% by weight or more, and the surface layer may be composed of only low density polyethylene (100% by weight). About the inner surface layer 21 which is a layer which comprises the outermost surface by the side of the inner surface of the film base material 11, at least 50 weight% of low density polyethylene is included. When using 2 or more types of low density polyethylene, the total amount of low density polyethylene should just be in this range.

  The low-density polyethylene constituting the surface layer 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 is a homopolymer of ethylene, or A copolymer of ethylene and an α-olefin having 3 to 20 carbon atoms is preferable. The same low density polyethylene as that constituting the base layer 20 can be applied to the low density polyethylene constituting the surface layer. These low density polyethylenes may be used independently and may use 2 or more types together. Moreover, the surface layer may contain other resin besides low density polyethylene. Suitable surface layers include 65 to 95% low density polyethylene and 5 to 35% ethylene-vinyl acetate copolymer (EVA), more preferably 70 to 90% low density polyethylene and 10 to 30 EVA. % Is included. The thickness of each surface layer is preferably 2 to 50 μm, more preferably 3 to 40 μm, and particularly preferably 5 to 30 μm.

  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. The thickness of the inner surface layer 21 is preferably 2 to 50 μm, more preferably 3 to 40 μm, and particularly preferably 5 to 30 μm. The inner surface layer 21 is preferably formed over the entire inner surface of the base layer 20.

  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 an ethylene homopolymer, Or it is preferable that it is a copolymer of ethylene and C3-C20 alpha olefin. The inner surface layer 21 contains 50% by weight or more, preferably 60% by weight or more of low density polyethylene based on the total weight. As the low density polyethylene constituting the inner surface layer 21, the same one as the low density polyethylene constituting the base layer 20 can be applied. These low density polyethylenes may be used independently and may use 2 or more types together.

  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. As resin which comprises the inner surface layer 21 with low density polyethylene, said 1st, 2nd linear low density polyethylene is mentioned, for example. In addition, styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SIS), styrene-diene series such as styrene-butadiene-isoprene-styrene block copolymer (SBIS), etc. Examples thereof include copolymers and EVA. Of these, first and second linear low density polyethylene and EVA are preferred. When low density polyethylene and EVA are used together as the inner surface layer 21, even when the inner surfaces of the cylindrical stretch label 10 are cut and fused together, the fusion can be peeled off with a weak force.

  When the inner surface layer 21 is composed of low-density polyethylene and EVA, the EVA content is 50% by weight or less, preferably 1 to 45% by weight, based on the total weight of the resin components constituting the inner surface layer 21. More preferably, it is 5 to 40% by weight, particularly preferably 10 to 30% by weight. 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 formed on the outer surface of the base layer 20. 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 18 μm. The outer surface layer 22 is preferably formed over the entire outer surface of the base layer 20.

  As the low density polyethylene constituting the outer surface layer 22, the same one as the low density polyethylene constituting the inner surface layer 21 can be used. The outer surface layer 22 may be formed using a mixed resin of low density polyethylene, first and second linear low density polyethylene, a styrene-diene copolymer, and EVA. In the present embodiment, the inner surface layer 21 and the outer surface layer 22 have 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 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. Although the thickness of the printing layer 12 is not specifically limited, Preferably it is 0.1-10 micrometers.

  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 into the cylindrical body (hereinafter referred to as the step (b)). Step (c)) and a step of producing a cylindrical stretch label 10 by cutting the cylindrical elongated body into individual label sizes (hereinafter referred to as step (d)).

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.

  The first elongate body may have a single-layer structure, and is composed of a first surface layer that becomes the inner surface layer 21 and a base layer 20, and does not have a second surface layer that becomes the outer surface layer 22. It is good. 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 long body is supplied to a printing machine or the like in a roll form and continuously conveyed in the MD direction (longitudinal direction of the long body), while one surface of the first long body or the other of the first 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 elongated body into a cylindrical shape, it is preferable to adjust the circumferential length of the cylindrical elongated body by slitting in the MD direction so as to have a predetermined width in the TD direction. 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 elongated body 30 is generally supplied to a stretch labeler (label mounting machine) in the form of a roll and cut at the labeler. For example, the cut position indicated by a dotted line before being mounted on a container or the like Cut at 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 base material 11 and the printed layer 12 in the portion where the crease line 31 is formed, but the composition of the film base material 11 is expanded as described above. The crack of the printing layer 12 at the folding position when the diameter is reduced is 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. In the cylindrical elongate body 30, by making the composition of the film base material 11 into the above-described configuration, the occurrence of the cut fusion is suppressed, and easy cutability is obtained. Alternatively, 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 long body) having the above-described configuration, it is possible to suppress the occurrence of cut fusion and suppress the cracking of the printed layer 12 at the label folding position. Is possible.

  The cylindrical stretch label 10 is attached to an article such as a container using a stretch labeler, for example. 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). The article is inserted into the inside of the expanded diameter cylinder. When the stretcher is removed and the pulling force is removed while the article 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 and outer surface layer raw materials (surface layer raw material) on both sides of the base layer raw material. Is supplied to a T-die and extruded from a slit on a casting drum cooled to 25 ° C. in two types and three layers to rapidly cool and solidify, and a film base material having a three-layer structure of inner layer / base layer / outer layer The long body (first long body) was obtained. The base layer had a density of 0.920 g / cm ³ and a thickness of 80 μm. Each of the inner surface layer and the outer surface layer (surface layer) had a density of 0.922 g / cm ³ and a thickness of 10 μm. The overall density of the film substrate (first elongated body) was 0.921 g / cm ³ and the thickness was 100 μm. Table 1 shows the raw material resin and the blending amount of each layer.

[Raw resin]
Base layer raw material: 1st linear low density polyethylene (UMERIT 715FT, ethylene / 1-butene copolymer, density: 0.915 g / cm ³ , melting point: 113 ° C., manufactured by Ube Maruzen Polyethylene Co., Ltd.) 18.8 weight %, Second linear low density polyethylene (UMERIT 1540FT manufactured by Ube Maruzen Polyethylene Co., Ltd., ethylene / 1-hexene copolymer, density: 0.915 g / cm ³ , melting point: 114 ° C.) 18.8% by weight, Low density polyethylene (F222NH manufactured by Ube Maruzen Polyethylene Co., Ltd., density 0.922 g / cm ³ , melting point: 110 ° C.) 62.4% by weight
Surface layer raw material: 100% by weight of low density polyethylene (F222NH manufactured by Ube Maruzen Polyethylene Co., Ltd.)

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 (one edge in the TD direction and the other edge) are overlapped so that the inner surface layer faces the inside of the cylindrical body, and the adhesive By forming a seal part using, a cylindrical long body A1 was obtained by forming into a cylindrical shape. 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).

  With respect to the cylindrical long body A1 and the cylindrical stretch label B1, cut fusion, mounting suitability, and printing layer cracking (the printing layer cracking was evaluated using the first long body) by the following measurement methods. Was evaluated. The evaluation results are shown in Table 1. In addition, the same evaluation was performed also about each label of Examples 2-6 and Comparative Examples 1-3.

<Evaluation of cut fusion (easy cutability)>
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 stretch labeler was attached to the container at a speed of 300 sheets / minute using the stretch labeler, and 200 labels were checked for folding.
○: No folding of the label was confirmed Δ: Several folding (less than 30) of the label were confirmed ×: More than 30 folding of the label was confirmed

<Evaluation of printing layer cracking (ink cracking)>
A rectangular sample piece having a length of 70 mm ± 0.1 mm in the TD direction and a length of 15 mm ± 0.1 mm in the MD direction was produced from the first long body. The sample piece was evaluated according to the following procedure.
(1) Folded flat so that the end portions in the direction corresponding to the MD direction coincide with each other so that the print surfaces of the sample pieces overlap each other, and a press machine (heat seal tester TP-701-B manufactured by Tester Sangyo Co., Ltd.) ), And stepped on at room temperature, 0.3 MPa, for 3 seconds to make 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 observing the printed surface with a visual inspection and a CCD camera (magnification 200 times).
○: No cracking of the printed layer was confirmed Δ: Cracking of the printed layer was confirmed using a CCD camera (not visually confirmed)
X: The crack of the printing layer was confirmed visually.

<Example 2>
The base material and the surface layer material were changed as follows, and the first elongate body and tube were the same as in Example 1 except that the thickness of the surface layer was 25 μm and the thickness of the base layer was 50 μm. Long body A2 and cylindrical stretch label B2 were produced.
Base layer raw material: 40% by weight of first linear low density polyethylene (same as Example 1), 20% by weight of second linear low density polyethylene (same as Example 1), low density polyethylene (same as Example 1) 40% by weight
Surface layer material: 88% by weight of low density polyethylene (same as in Example 1), ethylene-vinyl acetate copolymer (V206 manufactured by Ube Maruzen Polyethylene Co., Ltd., density 0.920 g / cm ³ , melting point: 102 ° C.) 12 weight%

<Example 3>
Except having changed the base layer raw material and the surface layer raw material as follows, it carried out similarly to Example 1, and produced the 1st elongate body, the cylindrical elongate body A3, and the cylindrical stretch label B3.
Base layer raw material: 35% by weight of first linear low density polyethylene (same as in Example 1), 22.5% by weight of second linear low density polyethylene (same as in Example 1), low density polyethylene (as in Example 1) Same) 52.5% by weight
Surface layer material: 70% by weight of low density polyethylene (same as in Example 1), 30% by weight of ethylene-vinyl acetate copolymer (same as in Example 2)

<Example 4>
Except having changed the base layer raw material as follows, it carried out similarly to Example 2, and produced the 1st elongate body, cylindrical elongate body A4, and the cylindrical stretch label B4.
Base layer raw material: 56% by weight of first linear low density polyethylene (same as Example 1), 44% by weight of low density polyethylene (same as Example 1)

<Example 5>
Except having changed the base layer raw material as follows, it carried out similarly to Example 1, and produced the 1st elongate body, cylindrical elongate body A5, and the cylindrical stretch label B5.
Base layer material: 19% by weight of first linear low density polyethylene (same as Example 1), 44% by weight of second linear low density polyethylene (same as Example 1), low density polyethylene (same as Example 1) 37% by weight

<Example 6>
The first elongate body and the cylindrical shape were changed in the same manner as in Example 1 except that the base layer raw material and the surface layer raw material were changed as described below, and a single-layer film was produced by extruding one kind of three layers. Long body A6 and cylindrical stretch label B6 were produced.
Film (single resin layer) raw materials: 20% by weight of first linear low density polyethylene (same as Example 1), 10% by weight of second linear low density polyethylene (same as Example 1), low density polyethylene (implemented) Same as Example 1) 64% by weight, ethylene-vinyl acetate copolymer (same as Example 2) 6% by weight

<Comparative Example 1>
Except having changed the base layer raw material and the surface layer raw material as follows, it carried out similarly to Example 1, and produced the 1st elongate body, the cylindrical elongate body X1, and the cylindrical stretch label Y1.
Base layer raw material: second linear low density polyethylene (same as Example 1) 30% by weight, low density polyethylene (same as Example 1) 70% by weight
Surface layer material: 70% by weight of low density polyethylene (same as in Example 1), 30% by weight of ethylene-vinyl acetate copolymer (same as in Example 2)

<Comparative example 2>
Except having changed the base layer raw material as follows, it carried out similarly to Example 1, and produced the 1st elongate body, the cylindrical elongate body X2, and the cylindrical stretch label Y2.
Base layer material: 50% by weight of first linear low density polyethylene (same as Example 1), 13% by weight of second linear low density polyethylene (same as Example 1), low density polyethylene (same as Example 1) 37% by weight

<Comparative Example 3>
Except having changed the base layer raw material as follows, it carried out similarly to Example 1, and produced the 1st elongate body, the cylindrical elongate body X3, and the cylindrical stretch label Y3.
Base layer material: 25% by weight of first linear low density polyethylene (same as in Example 1), 50% by weight of second linear low density polyethylene (same as in Example 1), low density polyethylene (same as in Example 1) 25% by weight

  As can be seen from the results shown in Table 1, each of the cylindrical stretch labels B1 to B6 of the examples is less likely to cause cut fusion and ink cracking than the respective cylindrical stretch labels Y1 to Y3 of the comparative example. It has a good fit. The labels of Examples 1 to 3 and 6 have particularly excellent characteristics.

  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 includes low density polyethylene and first linear low density polyethylene which is a copolymer of ethylene and 1-butene,
The content of the low density polyethylene is 50% by weight or more with respect to the total weight of the film substrate, and the content of the first linear low density polyethylene is 10 to 30% by weight,
The layer which comprises the outermost surface by the side of the inner surface of the said film base material is a cylindrical stretch label containing 50 weight% or more of the said low density polyethylene with respect to the total weight. The film base material includes a second linear low density polyethylene that is a copolymer of ethylene and an α-olefin having 5 to 20 carbon atoms,
The cylindrical stretch label according to claim 1, wherein the content of the second linear low-density polyethylene is 5 to 35% by weight with respect to the total weight of the film base material. The film substrate has a base layer and surface layers formed on both sides of the base layer,
The base layer comprises less than 70% by weight of the low density polyethylene and 15-60% by weight of the first linear low density polyethylene, based on the total weight of the base layer;
The said surface layer is a cylindrical stretch label of Claim 1 or 2 containing the said low density polyethylene 60weight% or more with respect to the total weight.   The cylindrical stretch label according to claim 3, wherein the base layer includes 5 to 40% by weight of the second linear low-density polyethylene with respect to the total weight.

Images