JP2014194477A - Cylindrical stretch label and container with label - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently prevent occurrence of breakage by reducing or eliminating damage of a label by friction.SOLUTION: A cylindrical stretch label 10 is expansible by 60% or more in a circumferential direction, and instantaneous distortion (50 mm/min) after expansion by 60% in the circumferential direction is 13% or less. The cylindrical stretch label 10 comprises: a cylindrical film substrate 11t containing linear low-density polyethylene as a main component; and a protective layer 14 formed on an outer surface of the cylindrical film substrate 11t. A container 20x with a label for a test is prepared by mounting the cylindrical stretch label 10 to a cylindrical container 21x while being elongated by 30% in the circumferential direction, and in the case where such three containers 20x with the labels for the test are piled up in chevron on an inclined plate 100 so that their protective layers 14 are in contact with each other, a coefficient of static friction in extension by 30% obtained from such a tilt angle θ that the upper container 20x with the label for the test starts sliding, is 0.25 or less.

Description

  The present invention relates to a cylindrical stretch label and a labeled container.

  Similar to the shrink label, the stretch label is attached to the container in the form of a cylindrical body. The cylindrical stretch label is fitted in the container in a state of being stretched by being pulled in the circumferential direction, and then contracts and follows the container when the pulling force is removed. For this reason, the cylindrical stretch label is required to be excellent in stretchability and restorability (hereinafter, these characteristics are collectively referred to as “stretchability”).

As an example of the stretch label, a film composed of a linear low density polyethylene having a density of 0.905 to 0.940 g / cm ³ and polymerized using a single site metallocene catalyst, and having a thickness of 30 to 150 μm. It was formed from a film that was deformed in the transverse direction at a speed of 300 mm / min and the stress 0 strain obtained by measuring a hysteresis curve of 25% or less did not exceed 7%, and the permanent strain did not exceed 1.5% A film for stretch labels is disclosed in Patent Document 1.

JP-A-9-297539

  By the way, since the cylindrical stretch label has high flexibility, for example, when the labels are rubbed, they may be pulled to cause damage such as tearing. In particular, unlike general stretch labels, cylindrical stretch labels with high stretchability can be attached to containers with different diameters, but when high stretchable cylindrical stretch labels are attached to containers with different diameters, Of the portion to be mounted, the portion corresponding to the large-diameter portion having a long peripheral length of the container (hereinafter referred to as “label large-diameter portion”) is greatly elongated, so that it is thinned. Further, the large-diameter portion of the label is a portion that is easy to come into contact with other labeled containers or the like in the manufacturing process or distribution / sales process. For this reason, especially a cylindrical stretch label is easy to be damaged in a label large diameter part, and a tear may generate | occur | produce.

  The cylindrical stretch label according to the present invention can be stretched by 60% or more in the circumferential direction, and the instantaneous strain (50 mm / min) after stretching by 60% in the circumferential direction is 13% or less. It is a shape-like stretch label, comprising a cylindrical film base material composed mainly of linear low density polyethylene, and a protective layer formed on the outer surface of the cylindrical film base material, and 30 in the circumferential direction. The three test labeled containers prepared by attaching to a cylindrical container in a stretched state are stacked so that the protective layers are in contact with each other on an inclined plate (two of the test labeled containers are The static friction coefficient at 30% elongation obtained from the inclination angle at which the upper container with the test label slides is fixed to the inclined plate, and the one container with the test label is placed on the inclined plate. With the following features That.

  According to the above configuration, the cylindrical stretch label can be stretched by 60% or more in the circumferential direction, and the instantaneous strain (50 mm / min) after stretching by 60% in the circumferential direction is 13% or less. Therefore, it can be attached to the container in a relatively large stretched state, and can be attached to containers having a diameter difference. Further, even when the cylindrical stretch label is attached in a state of being largely extended, the frictional force generated by contact between the cylindrical stretch labels can be reduced by providing the protective layer. As a result, it is possible to reduce or eliminate damage caused by friction of the label in the manufacturing process and distribution / sales process, and it is possible to obtain a labeled container in which the occurrence of tearing is sufficiently prevented.

In the cylindrical stretch label according to the present invention, it is preferable that the protective layer is composed of a base resin containing at least a styrene resin and includes at least one of wax particles and a silicone resin. Further, the wax particles are contained in an amount of 0.2 to 10% by weight based on the total weight of the protective layer, and the silicone resin is contained in an amount of 0.1 to 10% by weight based on the total weight of the protective layer. It is preferable that
According to the said structure, it becomes easy to make the said frictional force small and can provide the label which was more excellent in abrasion resistance.

  A labeled container according to the present invention includes the above-described cylindrical stretch label and a container, and the cylindrical stretch label is attached to the container in a state of extending in the circumferential direction.

  The cylindrical stretch label according to the present invention has high stretchability and can be attached to a container having a diameter difference. It is possible to provide a labeled container in which damage caused by friction of the label can be reduced or eliminated, and tearing is sufficiently prevented.

It is a perspective view which shows the cylindrical stretch label which is an example of embodiment of this invention. It is sectional drawing (AA sectional view taken on the line AA of FIG. 1) which shows the cylindrical stretch label which is an example of embodiment of this invention. It is a figure which shows a mode that the static friction coefficient (inclination angle | corner (theta)) of the container with a test label with which the cylindrical stretch label which is an example of embodiment of this invention was mounted | worn is measured. It is a perspective view which shows the container with a label which is an example of embodiment of this invention.

  Hereinafter, the cylindrical stretch label 10 which is an example of embodiment of this invention and the container 20 with a label which mounted | wore with this are demonstrated in detail.

  FIG. 1 is a view showing a cylindrical stretch label 10 that can be stretched by 60% or more in the circumferential direction and has an instantaneous strain (50 mm / min) after stretching by 60% in the circumferential direction is 13% or less. It is. The cylindrical stretch label 10 includes a cylindrical film base material 11t composed mainly of linear low density polyethylene and a protective layer 14 formed on the outer surface of the cylindrical film base material 11t. The cylindrical stretch label 10 is attached to the cylindrical container 21x in a state of being stretched 30% in the circumferential direction so that the protective layers 14 are in contact with each other on the inclined plate 100 with the three labeled containers 20x for testing. (Two test-labeled containers 20x are fixed to the inclined plate 100, and one test-labeled container 20x is disposed thereon), and the inclination angle θ at which the upper test-labeled container 20x slides is stacked. The static friction coefficient at 30% elongation obtained from 0.25 is 0.25 or less (see FIG. 3).

  As shown in FIGS. 1 and 2, the cylindrical stretch label 10 includes a film substrate 11 formed in a cylindrical shape and a design printing layer 12. The cylindrical stretch label 10 is formed into a cylindrical body by overlapping the end edges of the film base material 11 and joining (so-called center seal) to form a joint portion 13. In addition, let the film base material 11 formed in the cylinder shape be "the cylindrical film base material 11t." In the tubular stretch label 10, the design printing layer 12 is formed on the inner surface of the tubular film substrate 11 t facing the inner side of the tubular body.

  In the present specification, terms indicating directions such as “height direction”, “circumferential direction”, and “thickness direction” are used for the cylindrical stretch label 10 and the cylindrical film substrate 11t. “Height direction” means a direction (axial direction) connecting the one end side opening and the other end side opening of the cylindrical body. The “circumferential direction” means a direction along the outer periphery (the same applies to the inner periphery) of the cylindrical body in a plane orthogonal to the height direction, and the thickness direction means a direction orthogonal to the outer periphery and the inner periphery. means.

  Furthermore, the cylindrical stretch label 10 has a protective layer 14 that protects the cylindrical film substrate 11t by reducing the frictional force generated by contact between the cylindrical film substrates 11t of the labeled container 20 (see FIG. 4). Prepare. That is, the protective layer 14 has a function of preventing damage to the cylindrical film substrate 11t due to friction. The protective layer 14 is formed on the outer surface of the cylindrical film substrate 11t facing the outside of the cylindrical body.

  The cylindrical stretch label 10 may be provided with a layer other than the design print layer 12 and the protective layer 14 within a range that does not affect the stretch property and the like. For example, a top coat layer may be provided on the inner surface side of the design print layer 12 for the purpose of imparting slipperiness or protecting the print layer. The topcoat layer can also be formed using the same ink as that for forming the protective layer 14.

[Film substrate 11]
The film substrate 11 is composed mainly of linear low density polyethylene (LLDPE). The film base material 11 can also be made into a laminated structure using multiple types of linear low density polyethylene. Moreover, the single layer structure formed using a kind of linear low density polyethylene may be sufficient. Although it does not specifically limit as thickness of the film base material 11, It is preferable that it is 10-100 micrometers, More preferably, it is 15-80 micrometers, Especially preferably, it is 20-60 micrometers, Most preferably, it is 25-50 micrometers.

  The linear low density polyethylene is preferably a copolymer of ethylene and α-olefin. The α-olefin is preferably an α-olefin having 3 to 20 carbon atoms, and an α-olefin having 4 to 8 carbon atoms (for example, 1-butene, 1-pentene, 4-methyl-1-pentene, 1- Particularly preferred are hexene, 1-heptene, 1-octene and the like. The content of the α-olefin component is preferably 1 to 20% by weight, more preferably 2 to 15% by weight, and particularly preferably 5 to 10% by weight with respect to the total weight of the monomer component. . 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 linear low density polyethylene is preferably a copolymer of ethylene and α-olefin. The α-olefin is preferably an α-olefin having 3 to 20 carbon atoms, and an α-olefin having 4 to 8 carbon atoms (for example, 1-butene, 1-pentene, 4-methyl-1-pentene, 1- Particularly preferred are hexene, 1-heptene, 1-octene and the like. The content of the α-olefin component is preferably 1 to 20% by weight, more preferably 2 to 15% by weight, and particularly preferably 5 to 10% by weight with respect to the total weight of the monomer component. . 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 content of the linear low density polyethylene in the film substrate 11 is preferably 80% by weight or more, more preferably 90% by weight or more, and particularly preferably 95% by weight or more.

As described above, the density of the linear low density polyethylene is 0.880 to 0.930 g / cm ³ . If the density is within this range, good stretch properties can be obtained. Incidentally, the density of the linear low density polyethylene, more preferably 0.890~0.925g / cm ^3, particularly preferably from 0.900~0.920g / cm ^3, 0.905~0 Most preferred is 915 g / cm ³ .

  The MFR (190 ° C., 2.16 kg) of the linear low density polyethylene is preferably 1 to 30 g / 10 minutes. If the MFR is within this range, the productivity will be good. The MFR of the linear low density polyethylene is more preferably 1 to 20 g / 10 minutes, and particularly preferably 1 to 10 g / 10 minutes.

  A commercially available product can be used as the linear low density polyethylene. As an applicable commercial item, “Umerit (registered trademark) 715FT, 1540F, 0540F” manufactured by Ube Maruzen Polyethylene Co., Ltd. can be exemplified.

  Linear low density polyethylene is a monomer component other than ethylene and the above α-olefin, for example, vinyl carboxylate such as vinyl acetate (VA), unsaturated carboxylic acid such as acrylic acid (AA), methyl methacrylate (MMA), etc. (Meth) acrylic acid ester etc. may be contained. In addition, the “main component” means that a resin other than the linear low-density polyethylene and additives (for example, a lubricant and an antistatic agent) may be included within a range not impairing the object of the present invention. For example, the linear low density polyethylene may be 70% by weight (70% by weight or more) with respect to the total weight of the resin constituting the film substrate 11. Particularly preferably, the linear low density polyethylene is contained in an amount of 90% by weight or more.

  Furthermore, the film substrate 11 has a refractive index in the height direction that is larger than the refractive index in the thickness direction, and is 1.507 to 1.528. The refractive index in the height direction is preferably 1.510 to 1.525. In addition, the refractive index in the circumferential direction of the film substrate 11 is preferably equal to or smaller than the refractive index in the height direction and 1.500 to 1.528, Preferably it is 1.503-1.520. And it is preferable that the refractive index of the circumferential direction of the film base material 11 is equivalent to the refractive index of the thickness direction, or larger than the refractive index of the thickness direction. The refractive index in the thickness direction of the film substrate 11 is preferably 1.500 to 1.515, more preferably 1.500 to 1.510.

  In particular, the refractive index in the circumferential direction of the film substrate 11 is the thickness of the film substrate 11 so as not to impair the stretchability (stretch characteristics) of the film substrate 11 and to prevent partial distortion of the film substrate 11 when stretched. It is preferable that the refractive index is larger than the refractive index in the direction and equal to or smaller than the refractive index in the height direction.

  Further, the ratio (Rh / Rt) of the refractive index (Rh) in the height direction to the refractive index (Rt) in the thickness direction of the film substrate 11 is preferably 1.001 to 1.030. 002 to 1.020 is more preferable, and 1.003 to 1.015 is particularly preferable. The ratio (Rc / Rt) of the refractive index (Rc) in the circumferential direction to the refractive index (Rt) in the thickness direction of the film substrate 11 is preferably 1.000 to 1.030, preferably 1.001 to 1.020. Is more preferable, and 1.002 to 1.015 is particularly preferable. The ratio (Rc / Rh) of the refractive index (Rc) in the circumferential direction to the refractive index (Rh) in the height direction of the film substrate 11 is preferably 0.980 to 1.005, and preferably 0.985 to 1.000. More preferred is 0.990-0.999.

  The refractive index of the film substrate 11 can be realized by controlling the composition of the linear low density polyethylene that is the main component of the film substrate 11 and the stretching of the film substrate 11. In particular, the difference in refractive index between the height direction, the circumferential direction, and the thickness direction can be realized by controlling the stretching direction and stretching ratio of the film substrate 11.

  The thermal contraction rate of the film base material 11 (immersion in 80 ° C. warm water for 10 seconds) is preferably −5% or more and less than 10% (minus signifies expansion) with respect to the circumferential direction, from −3% to 8% is more preferable, and -2% to 5% is particularly preferable. Moreover, it is preferable that it is -5% or more and less than 10% with respect to a height direction, -1-8% is more preferable, and it is especially preferable that it exceeds 0% and is 6% or less.

[Design printing layer 12]
The design print layer 12 is a layer for displaying, for example, product names, illustrations, usage precautions, and the like, and is formed on the inner surface of the tubular film substrate 11t as described above. In consideration of the adhesiveness of the joint portion 13, the design print layer 12 is formed, for example, over substantially the entire inner surface excluding the joint portion 13. More specifically, it is preferable that the design print layers 12 are formed so as to overlap each other when the edges of the film base material 11 are overlapped to form the joint portion 13. Although the thickness of the design printing layer 12 is not specifically limited, Preferably it is 0.1-10 micrometers.

  The design print layer 12 may be formed on the outer surface of the film substrate 11, and is formed, for example, over the entire area excluding the joint portion 13. The design print layer 12 may be partially formed on at least one of the inner surface and the outer surface. In addition, the design printing layer 12 may be formed on the entire area of the inner surface or the outer surface including the joint portion 13 as long as the adhesiveness of the joint portion 13 is not impaired.

  The design printing layer 12 is formed by applying a printing ink on the surface which becomes the inner surface of the cylindrical body and solidifying it by drying or UV irradiation before the film substrate 11 is formed into a cylindrical shape. For the formation of the design printing layer 12, a desired colorant such as a pigment or dye, a binder resin such as acrylic resin or urethane resin, an organic solvent such as isopropyl alcohol, toluene or cyclohexane, ethyl acetate, butyl acetate, or methyl ethyl ketone, And solvent-type inks containing various additives (for example, plasticizers, lubricants, antistatic agents), or desired colorants, photopolymerizable resins such as acrylic resins, photopolymerization initiators, and the above various additives The ultraviolet curable ink containing is used as printing ink. And the design printing layer 12 can be formed by performing gravure printing, flexographic printing, letterpress printing, etc. using this printing ink.

[Junction 13]
As shown in FIG. 2, when the film base 11 is formed into a cylindrical shape and the edges are overlapped with each other, the joint portion 13 includes an inner surface of the film base 11 positioned outside the cylindrical body, and a cylindrical body. It can form by heat-sealing with the outer surface of the film base material 11 located inside. In addition, you may form the junction part 13 using an adhesive agent. As the formation pattern of the joint portion 13, in addition to the pattern illustrated in FIG. 2, the inner surfaces or outer surfaces of the end edges of the cylindrical body are overlapped, and the inner surfaces or the outer surfaces are joined. Patterns.

[Protective layer 14]
As described above, the protective layer 14 is a layer for preventing damage to the tubular film substrate 11t due to friction, and is formed on the outer surface of the tubular film substrate 11t as shown in FIG. For example, the protective layer 14 is formed on substantially the entire outer surface excluding the joint portion 13 in consideration of the adhesiveness of the joint portion 13. In the example shown in FIGS. 1 and 2, a region where the protective layer 14 is not formed along the height direction of the cylindrical film substrate 11 t is provided in the vicinity of the joint portion 13. It can also be formed such that the protective layers 14 overlap when the edges of the base material 11 are overlapped. In addition, since the protective layer 14 is formed outside the design printing layer 12, it is preferable to have transparency. Although the thickness of the protective layer 14 is not specifically limited, Preferably it is 0.1-10 micrometers.

  The protective layer 14 may be formed on a part of the outer surface. When the protective layer 14 is partially formed, it is preferable that the protective layer 14 is formed at least at a portion that is easily stretched and thinned when the cylindrical stretch label 10 is attached to the container, or at a portion where the cylindrical film substrate 11t is easily broken. It is. On the other hand, the protective layer 14 may be formed over the entire outer surface including the joint 13 as long as the adhesion of the joint 13 is not impaired.

  The protective layer 14 is preferably composed of a base resin containing a styrene resin. The base resin is a resin constituting the coating film of the protective layer 14. In the present specification, the styrene resin means a resin containing a styrene monomer as a structural unit (monomer) of the resin. More specifically, it is at least one selected from homopolymers of styrene monomers, copolymers of two or more styrene monomers, and copolymers of styrene monomers and other monomers.

  As the styrene resin, it is preferable to use a styrene thermoplastic elastomer (A) having a high molecular weight and a low MFR. Thereby, the outstanding ink performance (viscosity and fluidity | liquidity as a favorable printing ink) is hold | maintained, and the adhesiveness and adhesiveness to the film base material 11 and flexible film property are obtained. The styrene content of the styrenic thermoplastic elastomer (A) is preferably 10 to 50% by weight, particularly preferably 15 to 45% by weight. The weight average molecular weight (Mw; polystyrene conversion value by GPC) is preferably 5,000 to 700,000, more preferably 5,000 to 300,000, and particularly preferably 10,000 to 200,000.

  Preferable examples of the styrenic thermoplastic elastomer (A) include block copolymers of styrene and olefins and / or conjugated dienes, random copolymers, hydrogenated products thereof, and mixtures of two or more of these. Is mentioned. Examples of the olefin constituting the copolymer with styrene include those having 2 to 12 or more carbon atoms, such as ethylene, propylene, 1-butene, 3-methyl-1-butene, 4-methyl-1-pentene, 3- Examples thereof include C4-C20 α-olefins such as methyl-1-pentene, 1-heptene, 1-hexene, 1-octene, 1-decene and 1-dodecene, or a combination of two or more of them. Conjugated dienes include those having C4 to C20, such as butadiene, isoprene, and combinations thereof.

  Specifically, styrene-ethylene-butylene-styrene block copolymer (SEBS), styrene-ethylene-propylene-styrene block copolymer (SEPS), styrene-ethylene-ethylene-propylene-styrene block copolymer (SEEPS). ) Block and random copolymer of styrene and olefin, styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), styrene-butadiene random copolymer, etc. Examples thereof include block and random copolymers of styrene and conjugated dienes, hydrogenated products of these copolymers (for example, hydrogenated SEBS, hydrogenated SIS), and mixtures of two or more thereof.

  The styrenic thermoplastic elastomer (A) may contain monomer components other than the olefin and the conjugated diene. Examples of the monomer component include hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, lactone-modified hydroxyethyl (meth) acrylate, 2-hydroxy-3- Hydroxyl-containing monomers such as phenoxypropyl (meth) acrylate, (meth) acrylic acid, (anhydrous) maleic acid, (anhydrous) itaconic acid, (anhydrous) citraconic acid, ω-carboxy-polycaprolactone mono (meth) acrylate, Carboxylic acid (anhydride) group-containing monomers such as monohydroxyethyl (meth) acrylate phthalate, amide group-containing monomers such as (meth) acrylamide and methylol (meth) acrylamide, (meth) acrylates such as methyl ( (Meth) acrylate, ethyl (meth) acrylate, Propyl (meth) acrylate, n-butyl (meth) acrylate, i-butyl (meth) acrylate, tert-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, stearyl (meth) acrylate, tridecyl (meth) acrylate, Contains ester groups such as lauryl (meth) acrylate, cyclohexyl (meth) acrylate, benzyl (meth) acrylate, phenyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, vinyl acetate, vinyl propionate Monomer, epoxy group-containing monomers such as glycidyl (meth) acrylate, methyl glycidyl (meth) acrylate, isocyanate groups such as vinyl isocyanate and isopropenyl isocyanate Yutan monomers include nitrile group-containing monomers such as (meth) acrylonitrile. When the monomer component is contained, the content is preferably 0.5 to 20% by weight, particularly preferably 1 to 15% by weight.

  The base resin may contain a resin other than a styrene resin (styrene thermoplastic elastomer (A)), and preferably contains an alicyclic hydrocarbon resin (B). By mixing the alicyclic hydrocarbon-based resin (B), it is possible to obtain good adhesion to, for example, untreated polyolefin.

  Examples of the alicyclic hydrocarbon resins (B) include hydrogenated petroleum resins [hydrogenated products of petroleum resins (naphthene petroleum resins, aromatic petroleum resins, etc.)]. Specific examples thereof include Alcon M (M-135, etc.) and Alcon P (P-140, etc.) manufactured by Arakawa Chemical Industries, Ltd. The Mw of the alicyclic hydrocarbon-based resin (B) is preferably about 500 to 1500. The softening point of the alicyclic hydrocarbon-based resin (B) is preferably about 60 to 150 ° C, and the glass transition point (Tg) is preferably about 30 to 80 ° C. The content of the alicyclic hydrocarbon-based resin (B) can be appropriately changed according to the required performance and the like, but generally preferably the styrene-based thermoplastic elastomer (A) and the alicyclic hydrocarbon-based resin (B). The weight ratio [(A) / (B)] is 99/1 to 70/30, more preferably 95/5 to 75/25, and particularly preferably 90/10 to 80/20.

  The protective layer 14 preferably contains a silicone resin in order to improve slipperiness. By adding the silicone resin, the slipperiness can be improved without impairing the transparency. The content of the silicone resin is preferably 0.1 to 10% by weight, particularly preferably 0.5 to 5% by weight, based on the total weight of the protective layer 14.

  The silicone-based resin is, for example, a polysiloxane having a main chain composed of a siloxane bond, and a straight silicone compound having no substituent other than a methyl group and a phenyl group (dimethylsilicone, methylphenylsilicone, methylhydrogensilicone, etc.), It is a modified silicone compound having a substituent other than a methyl group or a phenyl group at the side chain or terminal.

  The silicone used as the base of the modified silicone compound may be a polysiloxane having a main chain composed of a siloxane bond. For example, all side chains, dimethyl silicone having a terminal methyl group, and a phenyl group in a part of the side chain Examples thereof include methylphenyl silicone and methyl hydrogen silicone in which a part of the side chain is hydrogen. The bonding position of the substituent in the modified silicone compound is not particularly limited, and may be present at both ends or one end of the main chain, or may be present at the side chain. Moreover, you may have a substituent in a side chain and the terminal.

  Examples of the substituent in the modified silicone include an epoxy group, a fluorine atom, an amino group, a carboxyl group, an aliphatic hydroxyl group (alcoholic hydroxyl group), an aromatic hydroxyl group (phenolic hydroxyl group), and a (meth) acryloyl group. Examples include a substituent and a substituent containing a polyether chain. Examples of the modified silicone having these substituents include epoxy-modified silicone, fluorine-modified silicone, amino-modified silicone, (meth) acryl-modified silicone, polyether-modified silicone, carboxyl-modified silicone, carbinol-modified silicone, phenol-modified silicone, Examples include diol-modified silicone. In addition to the substituents listed above, an organic group such as an alkyl group and / or an aralkyl group may be contained.

  Further, it is preferable that the protective layer 14 includes wax particles mixed in the base resin. By adding wax particles, the slipperiness of the protective layer 14 can be improved. The wax particles include mineral wax such as microcrystalline wax, paraffin wax and montan wax, polyolefin wax (polyethylene wax, polypropylene wax), ethylene-acrylic acid copolymer wax, ethylene-vinyl acetate copolymer wax, amide wax. Examples thereof include synthetic waxes such as synthetic waxes, lacquer wax, beeswax, white wax, wood wax, spermaceti, petrolatum, carnauba wax, and other resin waxes. Of these, polyolefin wax is preferable, and polyethylene wax is particularly preferable.

  The volume average particle diameter of the wax particles is preferably from 0.1 to 30 μm, more preferably from 1 to 20 μm, particularly preferably from 5 to 15 μm. The content of the wax particles is preferably 0.2 to 10% by weight, particularly preferably 0.5 to 5% by weight, based on the total weight of the protective layer 14.

  Like the design printing layer 12, the protective layer 14 is formed by applying printing ink on the outer surface of the cylindrical body and solidifying it by drying before the film substrate 11 is formed into a cylindrical shape. The In forming the protective layer 14, a solvent-type ink containing the base resin, the wax particles, the various additives, an organic solvent, and the like is used as a printing ink. The protective layer 14 can be formed by the same printing method as the design printing layer 12. Here, examples of the organic solvent include aromatic hydrocarbons such as toluene, xylene, and ethylbenzene, alicyclic hydrocarbons such as cyclohexane, methylcyclohexane, and ethylcyclohexane, aliphatic hydrocarbons such as hexane and heptane, and ethyl acetate. , Esters such as n-propyl acetate, I-propyl acetate, n-butyl acetate, I-butyl acetate, ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, etc. Glycol derivatives, alcohols such as methanol, ethanol, n-propanol, I-propanol, n-butanol, I-butanol, S-butanol, and mixtures of two or more thereof. Of these, aromatic hydrocarbons and alicyclic hydrocarbons are preferred. The organic solvent is preferably used in a range where the concentration of the nonvolatile content in the ink composition is 5 to 60% by weight, and the concentration of the nonvolatile content is particularly preferably 15 to 50% by weight.

  Here, the manufacturing method of the cylindrical stretch label 10 provided with the said structure is illustrated.

  A series of manufacturing steps of the cylindrical stretch label 10 is a step of manufacturing a first elongated body which is a first manufacturing intermediate mainly composed of the linear low density polyethylene (hereinafter referred to as a step (a)). The process of drawing the first elongated body to produce the second elongated body as the second production intermediate (hereinafter referred to as step (b)), and forming the design printing layer 12 on the second elongated body Then, a step of producing a third elongated body as a third production intermediate (hereinafter referred to as step (c)), a protective layer 14 is formed on the third elongated body, and a fourth production intermediate is produced. A fourth elongated body (hereinafter referred to as step (d)), and the fourth elongated body are formed into a cylindrical shape, cut into individual label sizes, and the cylindrical stretch label 10 is formed. It is preferable to include a manufacturing step (hereinafter referred to as a step (e)). In other words, the second long body is a long body of the film base 11 before being formed into a cylindrical shape. Further, the order of the step (c) and the step (d) may be reversed.

First, the step (a) will be described.
The first elongated body can be produced by a melt extrusion method. In the melt-extrusion method, a casting drum in which the raw material mainly composed of the above-described linear low density polyethylene is put into an extruder and melted, the melted resin is supplied to a T die, and the thin melt resin is cooled from the die slit. It is extruded and cooled to solidify into a film. Although extrusion temperature is not specifically limited, About 180 to 240 degreeC is preferable and 200 to 220 degreeC is more preferable. In this way, a 1st elongate body is produced.

  In the step (a), a laminate type film substrate 11 can be produced by using a plurality of types of linear low density polyethylene as the raw material. As a lamination method, for example, either a feed block method in which a feed block is installed immediately before a 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. Good.

Next, step (b) will be described.
In the step (b), the unstretched first elongated body produced in the step (a) is stretched. A 1st elongate body is extended | stretched at least in the longitudinal direction (henceforth MD direction) of a elongate body. Preferably, the elongated body is also stretched in the width direction (hereinafter referred to as TD direction) orthogonal to the MD direction. That is, in the step (b), the first elongated body is uniaxially stretched at least in the MD direction, and preferably biaxially stretched in the MD direction and the TD direction. Below, the case where biaxial stretching is illustrated. As the stretching method, a roll method, a tenter method, or the like can be applied. The MD direction corresponds to the height direction of the tubular stretch label 10, and the TD direction corresponds to the circumferential direction of the tubular stretch label 10.

  In the step (b), the first elongated body can be stretched in the MD direction and then stretched in the TD direction. For example, a biaxially stretched second elongated body is produced by stretching the first elongated body in the MD direction and the TD direction while winding it with a winder installed downstream in the MD direction. The stretching procedure is not particularly limited, and may be performed sequentially or simultaneously. Moreover, after extending | stretching to TD direction, you may extend | stretch to MD direction.

  The draw ratio is 1.01 to 1.40 times in both the height direction (MD direction) and the circumferential direction (TD direction) of the cylindrical stretch label 10 from the viewpoint of achieving both stretch characteristics and manufacturing suitability, preferably 1.03 to 1.35 times, particularly preferably 1.05 to 1.30 times. The cylindrical stretch label 10 may not be stretched in the circumferential direction, but is preferably stretched at a magnification equal to or less than that in the height direction. In particular, it is preferable that the film is stretched at the same magnification with respect to the circumferential direction and the height direction in a range of 1.05 to 1.30.

  Moreover, it is preferable to heat a 1st elongate body at the time of an extending | stretching process. The temperature at the time of stretching (stretching temperature) is less than the melting point of the resin composition constituting the first elongate body, preferably 45 ° C. or higher, particularly preferably 50 ° C. or higher. The temperature may be set to the same level at the time of heat stretching in the MD direction and at the time of heat stretching in the TD direction, but when the stretching process is performed sequentially, the stretching temperature in the TD direction is set higher than the MD direction. It is preferable.

Next, step (c) will be described.
In the step (c), the design print layer 12 is applied to one surface of the second elongated body while the second elongated body heated and stretched is supplied to a printing machine or the like in the form of a roll and continuously conveyed in the MD direction. Form. As described above, the design print layer 12 can be formed by a gravure printing method or the like. Thus, the 3rd elongate body by which the design printing layer 12 was formed in one surface of the extended 2nd elongate body is produced.

Next, process (d) is demonstrated.
In the step (d), the protective layer 14 is formed on the other surface of the third long body on which the design print layer 12 is formed while continuously transporting the long body in the MD direction. As described above, the protective layer 14 can be formed by a gravure printing method or the like. Thus, the 4th elongate body by which the protective layer 14 was formed in the other surface of a 3rd elongate body is produced.

Next, step (e) will be described.
In the step (e), first, the fourth elongated body on which the protective layer 14 is formed is formed into a cylindrical shape. The tubular body has a joint portion 13 in which the design printing layer 12 faces the inside of the tubular body, the protective layer 14 faces the outside of the tubular body, and both ends in the TD direction are overlapped so that the TD direction is the circumferential direction. It is produced by forming. The joining part 13 can be formed by heat sealing, for example.

  Finally, the 4th elongate body shape | molded by the cylinder shape is cut into each label size, and the cylindrical stretch label 10 is produced. The fourth elongated body is cut into individual label sizes while being continuously conveyed in the MD direction, but also exhibits good cut suitability in the cutting process. In addition, you may form a perforation line in the cylindrical stretch label 10 by a conventional method.

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

  The stretch characteristics of the cylindrical stretch label 10 can be expressed by tensile stress and instantaneous strain in a tensile test. The tensile stress is a force acting on the tensile tester when the evaluation sample is pulled and stretched at a predetermined speed. That is, the force resists stretching, and the smaller the tensile stress, the easier the label is stretched and the higher the stretchability. The instantaneous strain (%) indicates the degree to which the evaluation sample is deformed without returning to the original length after the tensile test, and is measured immediately after the load is removed. Note that the speed at which the evaluation sample is pulled and stretched in the tensile test is “50 mm / min” or “6000 mm / min” (hereinafter, “50 mm / min” when the speed is not specified). 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 can stretch 60% or more in at least the circumferential direction, and the preferred one can stretch 75% or more. The cylindrical stretch label 10 has an instantaneous strain (50 mm / min) after stretching 60% in the circumferential direction of 13% or less, preferably 11.5% or less, more preferably 10.5% or less, and most preferably. The thing is 10% or less. The instantaneous strain (6000 mm / min) after stretching 60% in the circumferential direction is preferably 30% or less, more preferably 20% or less, further preferably 18% or less, and particularly preferably 15% or less.

  Furthermore, the cylindrical stretch label 10 preferably has an instantaneous strain (50 mm / min) after stretching 75% in the circumferential direction of 13% or less, more preferably 11.5% or less, and even more preferably 10.5%. Hereinafter, the most preferable one is 10% or less. The instantaneous strain (6000 mm / min) after stretching 75% in the circumferential direction is preferably 30% or less, more preferably 20% or less, further preferably 18% or less, and particularly preferably 15% or less.

  The lower limit of the instantaneous strain of the cylindrical stretch label 10 is theoretically zero, but there are few cases where it is actually zero. For this reason, the lower limit of the instantaneous strain of the cylindrical stretch label 10 exceeds 0%, preferably 1% or more.

The stretch characteristic of the cylindrical stretch label 10 can also be expressed by permanent set. Permanent strain (%) indicates the degree to which the evaluation sample deformed without returning to its original length after the tensile test, similar to the instantaneous strain, but differs from the instantaneous strain in that it is measured 4 weeks after the load is removed. The extension speed of the evaluation sample in the tensile test when measuring permanent set is “50 mm / min”.
The smaller the permanent set, the higher the recoverability of the label and the better the stretch characteristics. The permanent set after stretching 60% in the circumferential direction (50 mm / min) is preferably 11% or less, more preferably 8% or less, still more preferably 7% or less, and particularly preferably 6% or less.

Further, in order to form the design print layer 12 without displacement, the elongation in the height direction (50 mm / min) when the tensile stress in the height direction tensile test is 4.3 N / mm ² is 9%. The following (for example, 1 to 9%) is preferable, 4 to 9% is more preferable, and 5 to 8% is particularly preferable.

The tubular stretch label 10 has a tensile stress (hereinafter referred to as F10 value) of at least 10% when stretched at least 10% in the circumferential direction, preferably 1 to 10 N / mm ² , more preferably ^{2 to} 8 N / mm ² , particularly preferably 3 to 7 N / mm ² . The tensile stress (hereinafter referred to as F60 value) when stretched at least 60% in the circumferential direction is preferably 1 to 12 N / mm ² , more preferably ^{2 to} 10 N / mm ² , and particularly preferably 3 ˜9 N / mm ² . In addition, if the lower limit value of the F10 value and the F60 value is too low, the tightening force of the container becomes too weak in the stretched state, and a good-looking wearing state may not be obtained.

As described above, the cylindrical stretch label 10 has a high stretch rate of 60% or more in the circumferential direction, an instantaneous strain (50 mm / min) after 60% stretch in the circumferential direction is 13% or less, and an F10 value in the circumferential direction. Is 10 N / mm ² or less, both of which are small values. That is, the cylindrical stretch label 10 has excellent stretch characteristics that are not found in conventional stretch labels.

  The static friction coefficient and scratch resistance of the cylindrical stretch label 10 will be described with reference to FIG. FIG. 3 is a diagram illustrating a state in which the inclination angle θ is measured using the test-labeled container 20x.

  The cylindrical stretch label 10 has a static friction coefficient obtained by the following method of 0.25 or less, preferably 0.23 or less, and particularly preferably 0.21 or less. If the static friction coefficient is within this range, the tubular film substrate 11t can be prevented from being scratched or torn, and the tubular stretch label 10 exhibits good scratch resistance. A static friction coefficient is calculated | required in the state which extended the cylindrical stretch label 10 30% in the circumferential direction.

Specifically, the static friction coefficient can be obtained by a method similar to the gradient method of JIS P81478. First, the cylindrical stretch label 10 is attached to the cylindrical container 21x in a state where it is stretched 30% in the circumferential direction, and three test labeled containers 20x are produced. The cylindrical container 21x has a body portion having a constant diameter and a cap (a diameter is smaller than the diameter of the body portion) attached to the body portion, and the cylindrical stretch label 10 is attached to the body portion. The That is, the diameter of the cylindrical stretch label 10 in the mounted state in the trunk is the same along the axial direction. Subsequently, as shown in FIG. 3, the test-labeled containers 20x are stacked so that the protective layers 14 of the cylindrical stretch label 10 are in contact with each other on the inclined plate 100 in a horizontal state. At this time, two test-labeled containers 20x (hereinafter referred to as “fixed containers”) are fixed to the inclined plate 100, and one test-labeled container 20x (hereinafter referred to as “non-fixed container”) is placed thereon. Deploy. The fixed container is arranged with the heights of the respective body parts aligned so that the body parts to which the cylindrical stretch label 10 is attached are in contact with each other. The inclined plate 100 is provided with a first fixing member 101 that comes into contact with the bottom of the body portion so that the heights of the body portions are aligned and the fixed container does not slide down. The 1st fixing member 101 has a flat surface along the direction orthogonal to the inclination direction of the inclination board 100, and supports the bottom face of the trunk | drum of a fixed container with the said flat surface. The first fixing member 101 is slidable in the tilt direction, and clamps and fixes the fixed container together with the second fixing member 102 provided on the upper portion of the inclined plate 100. The non-fixed containers are arranged so that the body parts to which the cylindrical stretch labels 10 are attached are in contact with the body parts of the two fixed containers and the heights of the body parts are aligned. In this state, the inclination angle θ at which the non-fixed container slides is measured by gradually inclining the inclined plate 100. The static friction coefficient μ is calculated by the following equation.
μ = tan (θ × 2π / 360 °)
It means that the smaller the static friction coefficient μ and the sliding angle θ, the smaller the frictional force between the cylindrical stretch labels 10.

The scratch resistance of the cylindrical stretch label 10 can be measured using a method based on the JIS Z0200 5.3 vibration test (for example, applying a sine logarithmic sweep method). Specific conditions are, for example, as follows. The entire surface of the cylindrical stretch label 10 mounted on the container can be visually checked for the presence or absence of scratches or tears, and scratch resistance can be evaluated.
Vibration test equipment; Vibration Research Co., Ltd. G-5230NS type Vibration acceleration: 0.75G
Frequency: 5-50Hz
Vibration direction and vibration time: Horizontal direction 20 minutes + vertical direction 20 minutes

  The configuration of the labeled container 20 will be described in detail with reference to FIG. FIG. 4 is a perspective view illustrating a labeled container 20 that includes the cylindrical stretch label 10 having the above-described configuration and a container 21 and is attached to the container 21 in a state where the cylindrical stretch label 10 extends in the circumferential direction. .

  The labeled container 20 includes a cylindrical stretch label 10 and a container 21. In the labeled container 20, the cylindrical stretch label 10 is mounted following the container 21 in a state of being stretched in the circumferential direction. In other words, before being attached to the container 21, the cylindrical stretch label 10 is set so that its peripheral length is smaller than the peripheral length of the container 21 where the cylindrical stretch label 10 is attached.

  The container 21 is positioned between the barrel 22 having a substantially circular cross section cut in the radial direction, a neck 23 having a smaller diameter than the barrel 22, and the barrel 22 and the neck 23. The container includes a shoulder portion 24 that is a portion to be reduced in diameter and a cap portion 25 that is attached to the neck portion 23. The container 21 is a so-called PET bottle filled with a beverage, for example.

  A plurality of ribs 26 a and 26 b are formed on the body portion 22. The ribs 26 a are formed at the upper part of the body part 22, and the ribs 26 b are formed at the lower part of the body part 22. The ribs 26 a and 26 b are concave portions formed in a ring shape in the circumferential direction of the body portion 22, and have a function of increasing the rigidity of the body portion 22. The body portion 22 has a constricted shape in the center in the vertical direction. The body portion 22 is divided into the upper and lower portions of the constricted portion, and the body portion 22 has a maximum body portion dm having a maximum circumference. In addition, the said narrow part becomes the minimum trunk | drum ds whose circumference becomes the minimum in the trunk | drum 22.

  In the labeled container 20, including the maximum body part dm and the minimum body part ds, near the intermediate position between the upper end of the body part 22 (the boundary position between the body part 22 and the shoulder part 24) and the lower end of the body part 22. A cylindrical stretch label 10 is attached so as to cover the above. Here, in the cylindrical stretch label 10, when the portion having the maximum circumference is defined as the maximum diameter portion Dm and the portion having the minimum circumference is defined as the minimum diameter portion Ds, in the present embodiment, the portion is attached to the maximum trunk portion dm. The portion that is formed is the maximum diameter portion Dm, and the portion that is attached to the minimum body portion ds is the minimum diameter portion Ds.

  As described above, the protective layer 14 of the cylindrical stretch label 10 is preferably formed over substantially the entire area of the outer surface excluding the joint portion 13. However, the protective layer 14 can also be formed on a part of the outer surface, and in that case, it is preferable to form at least the maximum diameter portion Dm of the cylindrical stretch label 10. Since the cylindrical stretch label 10 expands and thins most at the maximum diameter portion Dm and easily comes into contact with the adjacent labeled container 20 or the like, a cylindrical film is formed by forming a protective layer 14 on the portion. Damage due to friction of the substrate 11t can be prevented.

  In addition, in this embodiment, although the largest trunk | drum dm of the container 21 and the largest diameter part Dm of the cylindrical stretch label 10 have corresponded in the minimum trunk | drum ds and the minimum diameter part Ds, respectively, The mounting form is not limited to this. For example, the cylindrical stretch label 10 may be mounted up to the shoulder portion 24, and a mounting form in which the portion mounted on the shoulder portion 24 becomes the minimum diameter portion Ds may be employed. In the labeled container 20, for example, the ratio of the circumference of the maximum diameter portion Dm to the minimum diameter portion Ds (Dm / Ds) is 1.05 to 1.75, or 1.10 to 1.60, or 1.20. Even if it is ˜1.50, the tubular stretch label 10 is mounted with a good appearance.

  Of course, the cylindrical stretch label 10 can be suitably used for a portion having no diameter difference. Since the cylindrical stretch label 10 is attached in a stretched state in the circumferential direction, the tubular stretch label 10 can be attached to the container in a stretched state so as to have excellent stretch characteristics. For this reason, since the label excellent in a stretch characteristic can manufacture a labeled container using the cylindrical stretch label 10 with a small perimeter, material cost can be reduced. Therefore, when the cylindrical stretch label 10 is attached to a portion having no diameter difference (for example, a container body portion having no diameter difference), it is preferably attached in a state of being stretched 1.2 times or more in the circumferential direction. But it is not necessarily limited to this, You may make it mount | wear in the state expanded about 1.01-1.05 times.

  The cylindrical stretch label 10 is attached to the container 21 using, for example, a stretch labeler. The stretch labeler is externally fitted to the container 21 in a state where the cylindrical stretch label 10 is stretched in the circumferential direction. When the tubular stretch label 10 is externally fitted to the container 21 and the pulling force is removed, the label is elastically contracted and attached to follow the container 21. The cylindrical stretch label 10 is preferably attached in a state of being stretched in the circumferential direction by at least about 2%, and can be attached in a state of being stretched by about 60%.

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

<Example 1>
[Production of film substrate]
One type of linear low density polyethylene (“Umerit 715FT” manufactured by Ube Maruzen Polyethylene Co., Ltd.) was used as the resin component constituting the film substrate. For the production of the film substrate, an extruder having a merging method of feed block type 2 and layer 3 was used. The above-mentioned linear low density polyethylene is put into an extruder heated to 210 ° C., the molten resin is supplied to a T-die, and extruded from a slit onto a casting drum cooled to 25 ° C. in one type and three layers, and rapidly solidified. Thus, an elongated body of a single-layer unstretched film substrate was obtained.

  Next, the long body of the unstretched film substrate is stretched by heating at a stretching ratio of 1.06 times in the MD direction and a stretching temperature of 52 ° C., and then, at a stretching ratio of 1.06 times in the TD direction. The film was stretched by heating at a stretching temperature of 85 ° C. to obtain a long body of a biaxially stretched film substrate having a thickness of 50 μm. The stretching method was a roll method in the MD direction and a tenter method in the TD direction.

[Production of cylindrical stretch label A1]
By substantially gravure printing using a solvent-type ink while transporting the elongated body in the MD direction over almost the entire area excluding the portion that becomes the joint portion of one surface of the elongated body of the biaxially stretched film substrate, black, A design print layer having a thickness of 3 μm was formed using five colors of indigo, red, yellow, and white.

  Subsequently, a thickness of 0.8 μm is obtained by gravure printing using solvent-based ink while transporting the elongated body in the MD direction over substantially the entire area excluding the portion that becomes the joint portion of the other surface of the elongated body. A protective layer was formed. The solvent-based ink used for forming the protective layer was 86% by weight styrene-ethylene-butylene-styrene block copolymer (SEBS type) thermoplastic elastomer (“Tuftec M1943” manufactured by Asahi Kasei Chemicals Corporation) as a base resin, and 14% by weight of an alicyclic saturated hydrocarbon resin (“Arcon P-140” manufactured by Arakawa Chemical Co., Ltd.), silicone resin, polyethylene wax particles having a volume average particle diameter of 10 μm as wax particles, and 75% by weight as an organic solvent % Methylcyclohexane, 10% by weight isopropyl alcohol (IPA), 10% by weight normal propyl acetate (NPAc), 5% by weight 1-methoxy-2-propanol (PGM) mixed solvent, amide plastic as additive Contains agents. The content of each component is 30.7% by weight for the base resin, 0.3% by weight for the silicone resin, 0.8% by weight for the wax particles, and 67.7% for the organic solvent, based on the total weight of the ink. %, Additive is 0.5% by weight. The contents of the base resin, silicone resin, and wax particles in the protective layer (relative to the total weight of the protective layer) were 95.0% by weight, 1.0% by weight, and 2.5% by weight in this order. .

  By making the long body on which the design print layer and the protective layer are formed into a cylindrical shape and joining both end edges (forming a joint), a cylindrical long body is obtained, and this is cut into individual label sizes. A cylindrical stretch label A1 was obtained. In addition, when a film base material is made into a cylindrical shape and the edges are overlapped with each other, the joining portion has an inner surface of the film base material that is positioned outside the cylindrical body and a film base material that is positioned inside the cylindrical body. It is formed by heat-sealing with the outer surface.

  The cylindrical stretch label A1 was evaluated for stretch characteristics, refractive index, static friction coefficient, and scratch resistance (vibration test) by the following measurement methods. The evaluation results of the static friction coefficient and scratch resistance are shown in Table 1.

[Evaluation of stretch properties]
A rectangular sample piece having a length of 15 ± 0.1 mm in the height direction and a length of 200 mm in the circumferential direction (distance between marked lines 100 ± 2 mm) was produced from the cylindrical stretch label A1. A 60% tensile test was performed with the long side direction (circumferential direction of the cylindrical stretch label) of the sample piece as the measurement direction, and instantaneous strain (%) was measured. The 60% tensile test is a constant crosshead speed type or pendulum type tensile tester (test speed: 50 ± 5 mm / min), and a predetermined load (N) is applied to determine the distance between the marked lines of the sample pieces. This test was extended to 60%. After the test, the distance between the marked lines when the load was removed and returned to 0 (N) was read, 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)
As a result, the instantaneous strain at 60% elongation (test speed: 50 ± 5 mm / min) was 9.8%. Further, the instantaneous strain (%) was measured at a test speed of 6000 ± 600 mm / min in the 60% tensile test. As a result, the instantaneous strain at 60% elongation (test speed: 6000 ± 600 mm / min) was 3.5%.
Permanent strain (%) was calculated by removing the distance between the marked lines after removing from the testing machine after the 60% tensile test and storing in a thermostatic bath at 23 ° C. for 4 weeks. As a result, the permanent set was 4.0%.

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 is extended by 10%, and the F60 value, which is the tensile stress when the sample piece is extended by 60%, were obtained. The results are as follows.
F10 value: 5.2 N / mm ²
F60 value: 7.5 N / mm ²

  Further, a rectangular sample piece having a length of 15 ± 0.1 mm in the circumferential direction and a length of 200 mm in the height direction (distance between marked lines 100 ± 2 mm) is produced from the cylindrical stretch label A1, and the long side of the sample piece Tensile test (50 ± 5 mm / min) is performed with the direction (height direction of the cylindrical stretch label) as the measurement direction, and the elongation (%) of the sample piece when the tensile stress is 4.3 N from the stress strain curve obtained by the test ) Was measured. As a result, the elongation was 6.8%.

[Evaluation of refractive index]
The refractive index was measured based on JIS K 7105,7142 using the film base material before forming the design print layer and the protective layer. The refractive index was measured using a polarizing filter in the height direction, the circumferential direction, and the thickness direction when the film substrate was a cylindrical body. Details are given below.
Test method: Conforms to JIS K 7142 method A Measuring device: Abbe refractometer ("Abbe refractometer NAR-2T" manufactured by Atago Co., Ltd.)
Light source: Na white light source (589 nm)
The measurement results are as follows.
Refractive index in the height direction; 1.515
Refractive index in the circumferential direction; 1.513
Refractive index in the thickness direction; 1.508

[Evaluation of static friction coefficient μ (inclination angle θ)]
The cylindrical stretch label A1 was expanded by 45% in the circumferential direction, covered with a cylindrical plastic container, and attached to the barrel of the cylindrical plastic container in an expanded state by 30% to produce three test labeled containers. . The cylindrical plastic container has a trunk portion having a constant diameter and a cap (a diameter is smaller than the diameter of the trunk portion) attached to the trunk portion, the diameter of the trunk portion is 62 mm, the height is 100 mm, The volume is 250 mL. Subsequently, the test-labeled containers are stacked so that the protective layers of the cylindrical stretch label A1 are in contact with each other on an inclined plate in a horizontal state (see FIG. 3). At this time, two test-labeled containers (fixed containers) are fixed to the inclined plate, and one test-labeled container (non-fixed container) filled with 250 g of water is disposed thereon. The fixed containers are arranged with the heights of the respective body parts aligned so that the body parts to which the cylindrical stretch label A1 is attached are in contact with each other. Specifically, the first fixing member provided on the inclined plate supports the bottom surface of the body portion of the fixed container, and the fixed container is sandwiched between the first fixing member and the second fixing member provided on the upper portion of the inclined plate. And fix. The non-fixed containers are arranged so that the body parts to which the cylindrical stretch label A1 is attached are in contact with the body parts of the two fixed containers, and the heights of the body parts are aligned. In this state, the inclination angle θ at which the non-fixed container slides was measured by gradually inclining the inclined plate. The static friction coefficient μ was calculated by the following formula.
μ = tan (θ × 2π / 360 °)
In addition, the cylindrical stretch label A1 is expanded by 55% in the circumferential direction and covered with a cylindrical plastic container, and is attached to the barrel of the cylindrical plastic container in a state where it is extended by 50%, and three containers with test labels are attached. The static friction coefficient at 50% elongation was measured in the same manner as described above.

[Evaluation of scratch resistance (vibration test)]
It can be measured using a method based on JIS Z0200 5.3 vibration test (sine wave logarithmic sweep method is applied). Specific conditions are as follows.
Vibration test equipment; Vibration Research Co., Ltd. G-5230NS type Vibration acceleration: 0.75G
Frequency: 5-50Hz
Vibration direction and vibration time: Horizontal direction 20 minutes + Vertical direction 20 minutes Evaluation location: Entire surface of the cylindrical stretch label A1 attached to the container (the attachment form of the container and label is the same as in the case of evaluation of the static friction coefficient)
Evaluation method; visual evaluation criteria ○: No scratches or tears are seen on the label.
Δ: Scratches are seen on the label, but no tears are seen.
X: The label is broken.

<Example 2>
Example 1 except that the mixing ratio of the SEBS type thermoplastic elastomer and the alicyclic saturated hydrocarbon resin is 89% by weight for the former, 11% by weight for the latter, and the silicone resin is not used. In the same manner as above, a cylindrical stretch label A2 was obtained. The content of each component is 30% by weight of the base resin, 1% by weight of the wax particles, 68.5% by weight of the organic solvent, and 0.5% by weight of the additive with respect to the total weight of the ink. The contents of the base resin and wax particles in the protective layer (relative to the total weight of the protective layer) were 95.2% by weight and 3.2% by weight, respectively. Further, the stretch properties and the like were evaluated in the same manner as in Example 1 (the same applies hereinafter).

<Comparative Example 1>
Except not forming a protective layer, it carried out similarly to Example 1, and obtained cylindrical stretch label B1.

<Comparative example 2>
A cylindrical stretch label B2 was obtained in the same manner as in Example 1 except that a protective layer was formed using “Ultima NT Medium Y” manufactured by DIC Graphics Co., Ltd. as a solvent-type ink. This solvent-type ink contains an amide resin as a base resin and polyethylene wax particles having a volume average particle diameter of 9 μm as wax particles. The content of each component is 23.8% by weight of the base resin, 0.8% by weight of the wax particles, and 75.4% by weight of the organic solvent with respect to the total weight of the ink. The contents of the base resin and wax particles in the protective layer (relative to the total weight of the protective layer) were 96.7% by weight and 3.3% by weight, respectively.

  As shown in Table 1, the cylindrical stretch label of the example provided with the protective layer composed of the base resin has a smaller coefficient of static friction than the cylindrical stretch label of the comparative example, and has good scratch resistance. . In particular, the label (Example 2) provided with a protective layer containing a silicone resin has a smaller coefficient of static friction and excellent scratch resistance than the case where no silicone resin is contained (Example 1).

  DESCRIPTION OF SYMBOLS 10 Cylindrical stretch label, 11 Film base material, 12 Design printing layer, 13 Junction part, 14 Protective layer, 20 Labeled container, 21 Container, 22 Trunk part, 23 Neck part, 24 Shoulder part, 25 Cap part, 26a, 26b Rib, dm maximum body, ds minimum body, Dm maximum diameter, Ds minimum diameter.

Claims (4)

A cylindrical stretch label that can be stretched by 60% or more in the circumferential direction, and has an instantaneous strain (50 mm / min) after stretching by 60% in the circumferential direction of 13% or less,
A cylindrical film substrate composed mainly of linear low density polyethylene;
A protective layer formed on the outer surface of the tubular film substrate;
With
Three test-labeled containers prepared by attaching to a cylindrical container in a state stretched 30% in the circumferential direction are stacked so that the protective layers are in contact with each other on an inclined plate (of the test-labeled container). Two of them are fixed to the inclined plate, and the one container with the test label is arranged on the inclined plate), and the static friction at the time of 30% elongation obtained from the inclination angle at which the upper container with the test label slides. A cylindrical stretch label having a coefficient of 0.25 or less. In the cylindrical stretch label according to claim 1,
The protective layer is a cylindrical stretch label including a base resin containing at least a styrene resin and including at least one of wax particles and a silicone resin. In the cylindrical stretch label according to claim 2,
The protective layer includes the wax particles and the silicone particles,
The wax particles are contained in an amount of 0.2 to 10% by weight based on the total weight of the protective layer,
The said silicone resin is a cylindrical stretch label contained 0.1 to 10weight% with respect to the total weight of the said protective layer. The cylindrical stretch label according to any one of claims 1 to 3, and a container,
A labeled container attached to the container in a state where the cylindrical stretch label extends in the circumferential direction.

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