JP2000056690A - Film for stretch label - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve insufficient stretching property of a stretch label and to provide a film for a stretch label having excellent mechanical strength, heat resistance, scratching resistance of the surface and stretching and adhesive properties. SOLUTION: The stretch label consists of a polyethylene film 10 formed by coextrusion film forming method for forming three layers of three kinds. The film 10 is a laminated body consisting of an antiblocking layer 2 containing fine particles of an antiblocking agent having higher melting point than the polyethylene, a center layer 1 containing a lubricant comprising a fatty acid amide, and a surface layer 3 containing a lubricant and an antiblocking agent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a label mounted around a cylindrical or prismatic bottle or the like, and more particularly, to labeling utilizing the self-stretching property of a film. It belongs to a stretch label film that has excellent scratch resistance and printing effect that does not easily damage the surface.

[0002]

2. Description of the Related Art A conventional label attached to a container is a tubular label made of a stretched film such as polystyrene or polyvinyl chloride having a picture layer provided on the front surface of a film or the back surface of a transparent film, and is adhered by heat shrinkage. A shrink label to be applied, a method of attaching the above-mentioned label with an adhesive or a glue-attached label to be attached to a label paper obtained by laminating paper or a film or aluminum foil and paper provided with a pattern layer,
There are stretch labels and the like in which a tubular label made of a plastic film having a self-stretch property provided with a picture layer is stretched and inserted into a container and adhered to the container.

[0003] Among the above, the stretch label has not only a feature that it is rich in flexibility that can closely follow the delicate deformation of the container even after being attached to the plastic container, it is excellent in water resistance, and the stretch label is easy to use. Is simply adhered (in the present specification, a state in which evenly attached, but when peeled off, there is no debris attached to any of the container and label and can be peeled off at the interface is referred to as adhesion). It is. Therefore, it can be used for drinking water containers such as glass, polyethylene terephthalate (hereinafter referred to as PET), polyvinyl chloride, etc., and the fragments obtained by crushing the collection container can be separated from the label by the difference in specific gravity. Because it does not require heat or special adhesives, it is often used for labels on recycled containers.

[0004] A stretch label made of a film having excellent self-stretchability provided with a pattern layer by gravure printing, flexo printing, silk screen printing, or the like, is attached to a plastic container or a glass container. It has the characteristic that it can adhere and follow with the picture layer.
Conventionally, as a film for a stretch label, a technique using a film of an ethylene / vinyl acetate copolymer (hereinafter, referred to as EVA) containing 20% by weight or less of vinyl acetate is also disclosed. Kosho 55-40
474). However, EVA films are
The mechanical strength such as the tear strength is inferior. After filling with a hot solution, particularly filling with carbonated fruit juice or the like, sterilization treatment with hot water at 80 to 100 ° C (hereinafter referred to as pasterizer treatment) or cooling is performed. In such a case, the label loses its elasticity and cannot follow the shape change of the container.

Further, when a stretch label is attached to a container, it cannot be smoothly attached due to poor slippage, and a film to which a "lubricant" such as a fatty acid amide is added has been used for the purpose of improving the slip. However, these lubricants tend to exude more to the corona treated surface applied to the side of the film that will be the printing surface. Therefore, there is a problem that the printing ink is repelled at the time of printing to reduce the printing effect, or the adhesion between the ink and the film is hindered.

When the content of vinyl acetate is increased in order to increase the stretchability of the EVA film, not only the heat resistance is further reduced, but also the tackiness is increased, which hinders handling such as film winding. The problem occurred. To solve this problem, increasing the amount of lubricant added will hinder the adhesion of the printing ink as described above,
In addition to repelling the printing ink, the printing effect may be reduced, and the adhesive state when the film is processed into a tubular shape for forming a stretch label may vary.

On the other hand, low-density polyethylene (hereinafter, referred to as LDPE), which is a homopolymer of ethylene having low tackiness, may be used, but it can comprehensively solve stretchability, slipperiness, and printability. Was not. Also,
A technique for a stretch label film using a relatively low-density linear polyethylene having a density of 0.905 to 0.940 g / cm ³ has also been disclosed (see JP-A-7-234638). However, there has been a problem that the stretchability of the film formed from linear polyethylene is not sufficient, and the adhesion after inserting the label into the container, the heat-resistant slipping property, and the scratch resistance are poor.

[0008]

DISCLOSURE OF THE INVENTION The present invention relates to a stretch label such as EVA film or LDPE, which has drawbacks such as mechanical strength, heat resistance, surface scratch resistance, oil resistance, and the like.
A stretch label with excellent elasticity and adhesion, which not only improves the lack of elasticity but also has chemical resistance, printing effect, and does not generate wrinkles when cooled after pasting with hot water after filling with carbonated juice. It is an object of the present invention to provide a film for use.

[0009]

In order to solve the above-mentioned problems, the present invention relates to a stretch label 10 comprising a polyethylene film formed by co-extrusion of three types and three layers as shown in FIG. The adhesion preventing layer 2 containing a fine particle antiblocking agent having a higher melting point than polyethylene, the central layer 1 containing a fatty acid amide lubricant, and the surface layer 3 containing a fatty acid amide lubricant or the above lubricant and an antiblocking agent. This is a stretch label film 10 composed of a laminate. Then, the above-mentioned polyethylene film is a stretch label film that is stretched in one direction by 5 to 15% and heat-fixed after film formation. Further, the polyethylene film is a stretch label film made of linear low-density polyethylene polymerized using a single-site catalyst. And it is a film for a stretch label in which the anti-blocking agent is fine silica particles and the lubricant is erucic acid amide and / or ethylene bisoleyl amide.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 1, the stretch label film of the present invention is formed by co-extrusion of three types and three layers of thermoplastic resin. Each of the above-mentioned layers contains an anti-adhesion layer 2 containing a fine particle anti-blocking agent having a melting point higher than that of polyethylene, a central layer 1 containing a lubricant made of a fatty acid amide, and a lubricant made of a fatty acid amide, or contains the lubricant and the anti-blocking agent. This is a stretch label film 10 composed of a laminate with the surface layer 3. Then, after the polyethylene film is formed,
This is a stretch label film that is stretched in one direction by 15% and heat-set. Further, the polyethylene film is a stretch label film made of linear low-density polyethylene polymerized using a single-site catalyst. The polyethylene of each layer may have a different property (stretchability, heat resistance) by blending polyethylene having different densities or other olefin-based resins. The anti-blocking agent of the present invention is silica fine particles, and the lubricant is erucic acid amide and / or
Or a film for a stretch label, which is ethylene bisoleyl amide.

In the present invention, the polyolefin resin mixed with the linear low-density polyethylene polymerized using a single-site catalyst includes a linear low-density polyethylene polymerized using a multi-site catalyst. Examples include high density polyethylene, LDPE, high density polyethylene, EVA, ethylene / acrylic acid copolymer, ethylene / acrylic acid ester copolymer, polypropylene, and ionomer. When these resins are mixed, it is desirable that the film density does not exceed 0.970 g / cm ³ . When the film density exceeds 0.970 g / cm ³ , glass,
Even if the label is peeled off from the container after being attached and used as a label on a container such as PET or polyvinyl chloride, it is difficult to separate the container from the crushed resin due to the difference in density. Therefore, it is preferable to set the density of the film to be smaller than the density of the container.

[0012] Polyethylene Density of polymerized using a single site catalyst rich in contractility that constitutes the central layer of the present invention, relatively low 0.880~0.920g / cm ³ are preferred. Particularly preferably, 0.905 to 0.9
20 g / cm ³ . Those having a density of 0.880 g / cm ³ or less have poor heat resistance and may be deformed by a pastelizer treatment after being mounted on a container. In addition, density 0.9
If it is 20 g / cm ³ or more, the heat resistance is satisfied, but the self-elasticity is inferior, and it cannot follow the delicate change of the container after mounting, causing the label end to float or the label to fall off when severe. Or you may.

The density of polyethylene polymerized using a single-site catalyst constituting the adhesion preventing layer and the surface layer is preferably from 0.920 to 0.970 g / cm ³ , particularly preferably 0 to 0.970 g / cm ^3. .925-0.940g
/ Cm ³ . The stretch label film having the three-layer structure causes the central layer to function as a self-stretching action as a stretch label. Relatively high density anti-adhesion layer and surface layer of polyethylene, three types of additives and types are added to give the necessary surface functions such as printing effect, heat resistance, mechanical strength and slippage to the label. A polyethylene layer is formed by co-extrusion of three layers.

The adhesion preventing layer 2 shown in FIG. 1 contains a fine particle antiblocking agent having a higher melting point than the above polyethylene. Anti-blocking agent is an inorganic compound,
Although any of organic compounds can be used, fine particles capable of transferring ink uniformly without impairing the transparency of the film and printing the surface thereof are preferable. For example,
Oxides such as aluminum oxide, magnesium oxide, silica, calcium oxide, titanium oxide, iron oxide, zinc oxide, hydroxides such as aluminum hydroxide, magnesium hydroxide, calcium hydroxide, magnesium carbonate, calcium carbonate, zinc carbonate, Carbonates such as lithium carbonate, sulfates such as calcium sulfate, zinc sulfate and barium sulfate, silicates such as magnesium silicate, aluminum silicate, calcium silicate, aluminosilicate and aluminum silicate, kaolin, talc and silica So there are inorganic compounds such as earth. Among them, silica is a preferable material from the viewpoint that adhesion between films can be prevented without impairing transparency.

The antiblocking agent composed of an organic substance includes high-density polyethylene as fine particles of an organic polymer, ultra-high-molecular-weight polyethylene having a molecular weight of 300,000 or more, polypropylene, polycarbonate, polyamide, polyester, melamine resin, and allyl phthalate resin. And fine powder such as an acrylic resin can be used alone or in combination with the above inorganic antiblocking agent.
The amount of the antiblocking agent added to the adhesion preventing layer is 0.01 to 3 parts by weight, preferably 0.1 to 1.0 part by weight, based on 100 parts by weight of the resin of the adhesion preventing layer. If the amount of the antiblocking agent is small, the effect is not exhibited, and 3
If the amount is more than 10 parts by weight, the smoothness of the surface is reduced and the printing effect is not only hindered, but also the transparency is deteriorated.

The lubricant to be added to the center layer and the surface layer is selected from materials which are usually used and which have lubricity by themselves and are less likely to migrate inside the polyethylene film. For example, liquid paraffin, white petrolatum, petroleum wax, microcrystalline wax, montan wax, polyethylene wax, having 8 to 22 carbon atoms
Higher fatty acids, metal salts of higher fatty acids such as higher fatty acids aluminum, higher fatty acids calcium, higher fatty acids magnesium, higher fatty acids zinc, higher fatty acids lithium, and straight-chain aliphatic monohydric alcohols having 8 to 18 carbon atoms, and glycerin Sorbitol, propylene glycol, pentaerythritol, triethylene glycol, and the like, and esters of higher fatty acids having 4 to 22 carbon atoms and linear aliphatic monohydric alcohols having 8 to 18 carbon atoms. Also, acetyl tributyl citrate, diethyl adipate-ethyl-hexyl, azelaic acid-n-hexyl, ethanediol montanic acid ester,
Esters of fatty acids with alcohols such as poly (1,3 butanediol adipic acid) ester, methyl acetyl ricinoleate, poly (1,3 butylene glycol, 1,4 butylene glycol, octyl alcohol adipate) and bran wax And glycerides such as hydrogenated edible oils and fats, castor oil, sperm acetyl wax, and acetylated monoglycerides. Higher fatty acid amides such as ethylene bis fatty acid amides having 16 to 18 carbon atoms such as ethylene bis oleyl amide, higher fatty acid amides having 8 to 22 carbon atoms, stearyl elca amide, erucic acid amide, and oleyl palmito amide is there. In addition, methylhydrodienepolysiloxane, dimethylpolysiloxane, methylphenylpolysiloxane,
Examples include silicone oils such as polyoxyalkylene and dimethylpolysiloxane, and glycerin esters of rosin and maleic acid-modified rosin. Among these, erucic acid amide, ethylene bisoleyl amide, and those having 2 carbon atoms
The erucic acid amide 2 has lubricity in itself. The erucic acid amide migrates to the surface at an early stage immediately after film formation (so-called fast-acting), and exhibits an effect from the time of winding, etc., and ethylenebisoleylamide is slow-acting, and is used for printing and label mounting. 3 shows the effect of slipping the label surface between bottles.

In general, a lubricant added to a single-layered polyethylene film tends to precipitate on the surface subjected to corona discharge treatment. Therefore, the non-treated surface is less likely to function as a lubricant, and the amount of addition is increased to impart lubricity to the non-treated surface. However, the above lubricants, particularly ethylene bisoleyl amide and erucic acid amide, have a large number of carbon atoms in the alkyl group, and thus have a releasability (poor ink adhesion) in the center of a stretch label film composed of three layers. When added to the layer and the surface layer, the migration to the adhesion preventing layer is further prevented from being deposited on the surface and hindering printing. Therefore, the action as a lubricant existing in the surface layer or the center layer can be maintained. The amount of the lubricant to be added is 0.005 to 0.1 parts by weight based on 100 parts by weight of the resin of the center layer and the surface layer.

On the surface layer of the stretch label film, not only an anti-blocking agent but also, if necessary,
An antistatic agent may be added in addition to a lubricant and an antiblocking agent in order to prevent dust from adhering to the surface, adhesion due to static electricity in the labeling step, and multiple feeds. Antistatic agents include metal compounds, epoxy compounds, nitrogen compounds, and phosphorus compounds that can be used for antistatic agents such as nonionic surfactants, anionic surfactants, amphoteric surfactants, and / or polyolefin resins. , A sulfur compound, a phenol compound and the like can be appropriately selected and added.

The stretch label film of the present invention comprises:
This is a stretch label film that is stretched in one direction by 5 to 15% and heat-fixed after film formation. As shown in FIG. 3, the stretching and heat setting are performed by pressing the three types of resin melt-coextruded into three layers with a multilayer T die 51 on a cooling roll 53 with an air knife 52 to cool and solidify to form a three-layer film. I do. Then, the mixture is heated to 80 ° C.
(Stretching section 60) until the heating roll 55
The temperature is maintained and maintained at the same temperature between and to the cooling roll 56 (heat fixing section 61), and the cooling roll 56 sets the temperature to normal temperature. Then, the surface speed of the heating roll 55 and the cooling roll 56 is set to be 5 to 15% faster than the surface speed of the heating roll 54, and the film heated to 80 ° C. in the stretching unit 60 is stretched 5 to 15%. Then, the heating is continued by the heat fixing section 61 provided before reaching the cooling roll 56 and heat fixing is performed.

The film heat-fixed at 80 ° C. has little dimensional change such as expansion and contraction even when heated during handling, transportation, printing, etc., and has no change in printing register and printing pitch. Met. And when it was finished in a tubular form, it was a beautiful stretch label with stable pitch. It has the characteristics of shrinking for the first time and good adhesion, and less likely to be wrinkled by the pastelizer treatment after being attached to the container.

The thickness of the stretch label film is 3
It is preferably from 0 to 150 μm. When the thickness is 30 μm or less, wrinkles are likely to be formed when printing or performing label processing for joining and cutting into a cylinder. When the thickness is 150 μm or more, not only waste of resources but also rigidity is increased and stretch suitability is deteriorated. In some cases, the insertion / attachment work may be hindered. In the case of the three-layer co-extruded film of the present invention, if the ratio of the center layer is increased, desired elasticity can be expected even at 150 μm or more.

The thickness of each layer of the three-layer stretch label film is not particularly limited, but it is necessary to set the center layer to be relatively thick and the adhesion preventing layer and the surface layer to be relatively thin from the viewpoint of suitability as a stretch label. preferable. For example, the thickness of the center layer is ２〜 to の of the total thickness, and the thickness of the adhesion preventing layer and the thickness of the surface layer are each １ ／ to １ ／ of the total thickness. This thickness is also recommended from the viewpoint of preventing curling of the film.

The stretch label film of the present invention comprises:
It can be formed by a normal film forming method of a T die and a circular die. Preferably, a T-die method is used in which the gloss of the surface can be freely selected depending on the surface shape of the cooling roll, and the film can be stretched and heat-treated in the film forming step. The multi-layering may be performed by either a multi-die type die or a feed block type die, and the merging may be performed inside the die or outside the die.

In the film of the present invention, the anti-adhesion layer on which the picture layer is provided is subjected to an easy adhesion treatment such as a corona discharge treatment, and then the picture layer is subjected to gravure printing, flexographic printing, silk screen printing or the like in a desired design. Provide.
In normal printing, a glossy picture layer can be seen through a transparent film, and the picture layer of the label is usually printed on the back side where the film is protected. It is also possible to perform printing on an unprocessed film surface that is not subjected to an easy-adhesion treatment, or surface printing (for example, additional printing such as quantity, price, and manufacturing date).

The printing ink on which the picture layer is provided may be suitable for the surface layer which is a normal printing surface (in the case of back printing, gloss is not required), and a coloring agent of an inorganic or organic pigment,
And a highly elastic binder suitable for printing plastic films. The binder is appropriately selected from polyamides, polyesters, polyurethanes, cyclized rubbers and the like which can be dissolved in a usual solvent for gravure ink. Then, it is preferable to add a lubricant or an anti-blocking agent to these inks to give lubricity and prevent blocking.

The stretch label film of the present invention comprises:
Normally, as shown in FIG. 2 or FIGS. 4 (A), 4 (B) and 4 (C), the back surface printing is performed on the corona-treated surface of the adhesion preventing layer 2 of the stretch label film 10 in a direction in which the film forming direction M is viewed from the top. The picture layer 4 is provided, and the picture layer 4 is formed in a tubular shape with the inside face inward, and the end of the non-printing face is subjected to corona discharge treatment if necessary (for example, in the case of a polyolefin resin) to form an adhesive 7.
Is applied and adhered on the front and back of the film to form a joint portion 5 to form a tubular stretch label 6.

Although not shown, the circumference of the stretch label is designed to have a length in the lateral direction of the film (a direction perpendicular to the film forming direction) so as to be 98 to 90% of the outer periphery of the container to be mounted. Also, the top and bottom of the stretch label, that is, the direction of film flow is cut to the desired length of the label. Then, the label formed in a cylindrical shape is stretched by 15 to 25% in a horizontal direction by a label mounting machine, inserted into the container in a spread state, then contracted when the stretch is removed, and the label is shrunk on the outer surface of the container. It adheres closely.

The stretch label formed from the stretch label film of the present invention is stretched and thermally fixed by 5 to 15% in the longitudinal direction at the time of film formation. Therefore, even if the label is stretched in the horizontal direction, stretched and attached to a container, and further subjected to a heat treatment with hot water or the like, the heat-fixed label of the present invention does not shrink during normal handling, and is a stretch label. As a result, it is possible to form a label having a stable and beautiful printing effect. In addition, when a heat treatment using hot water or the like is performed, the conventional label is elongated in the vertical direction (film forming direction), causing wrinkles, falling off, and the like. It has good adhesion and exhibits a wrinkle-free labeling effect.

[0029]

(Example 1) A three-layer structure shown in FIG. 1 having a density of 0.920 g / c when polymerized using a single-site catalyst containing 0.5% of synthetic silica as an antiblocking agent.
1 m ³ linear polyethylene / α-olefin copolymer
“Anti-adhesion layer 2” of 5 μm, and linear low-density polyethylene containing 0.05% of erucic acid amide and polymerized using a single-site catalyst having a density of 0.895 g / cm ³ of 50 μm Central layer 1 ", 0.05% of erucic acid amide and ethylenebisoleylamide.
A “surface layer 3” composed of a linear polyethylene / α-olefin copolymer having a density of 0.925 g / cm ^{3 and} a thickness of 15 μm polymerized using a single-site catalyst containing 05% and 0.5% of synthetic silica. Three kinds of film raw materials were prepared. Then, using a multi-manifold type T die, as shown in FIG. 3, a three-layer film is extruded at 230 ° C. from the T die 51 at the above-mentioned film composition ratio, and the mirror surface is cooled at a temperature of 20 ° C. by an air knife 52. The three-layer three-layer film was cooled and solidified by being brought into close contact with the roll 53.
Further, the surface speed ratio between the heating roll 54 and the heating roll 55 and the cooling roll 56 was set to 1.10 times. Then, the heating roll 54 and the nip roll 64
And the film was pressed by the heating roll 55 and the nip roll 65, and passed through the heating roll 55 while being stretched by the stretching unit 60. Further, while the film is heat-fixed by the heat fixing portion 61 provided between the heating roll 55 and the cooling roll 56 with substantially the same tension as the stretching portion, the cooling roll 56
Then, the film was stretched and heat-set by 10% in the film forming direction by pressure bonding with a nip roll 66, and then cooled to produce a stretch label film 10 of the present invention. Then, although not shown, the surface not in contact with the cooling roll 56 was subjected to a corona discharge treatment and an easy printing treatment was carried out to produce an 80 μm-thick stretch label film 10 of Example 1.

(Example 2) All of the resins used were polymerized using a single-site catalyst, and the density was 0.920 g /
"Anti-adhesion layer 2" containing 0.5% of synthetic silica as an antiblocking agent in the same manner as in Example 1 with a linear polyethylene / α-olefin copolymer of cm ^3.
And "Central layer 1" containing 0.05% erucic acid amide
And three kinds of film raw materials comprising 0.05% of erucic acid amide, 0.05% of ethylenebisoleylamide and 0.5% of synthetic silica were prepared. Then, in the same manner as in Example 1, the film was stretched and heat-fixed by 10% in the film forming direction, and then cooled to prepare a stretch label film 10 of the present invention.

(Comparative Example 1) A stretch label film of Comparative Example 1 in which the same resin and additive composition as in Example 2 was used, and a three-layer, three-layer structure was simply stretched by 10%, and heat fixing was not performed. did.

(Comparative Example 2) Instead of the resin of Comparative Example 1 and EVA containing 8% of vinyl acetate, synthetic resin was further added to 0.1%.
A stretch label film of Comparative Example 2 was prepared using a composition containing 5% and stearic acid amide 0.1% in which a single-layer structure was simply stretched by 10%.

Next, the stretch label films of Examples and Comparative Examples were comprehensively evaluated for shrinkage suitability, heat-resistant slip resistance, surface gloss and transparency by the following methods. Table 1 shows the results. Suitability for shrinkage: The length of the sample in the vertical direction parallel to the film forming direction is 15 mm, and the length in the horizontal direction crossing the film forming direction is 100.
A rectangular sample cut to a width of 300 mm
The film was stretched by 25% at a speed of min and tension-free, and the strain% at a shrinkage stress of 0 was measured. Heat resistance: The plate heater 31 was attached to the dynamic friction measuring device 30 shown in FIG.
7) so that the lateral direction of the non-corona-treated surface of the sample film 10 can be measured.
The plate 31 heated to 40, 50 and 60 ° C. in 2 was pressed, and after 3 minutes, the dynamic friction coefficient of the metal sliding piece 32 was measured using a load cell 35. Surface gloss: A gloss of 60 ° × 60 ° was measured based on (JIS K7105-1981). Transparency: Haze was measured based on (JIS K7105-1981). Printability On the corona-treated surface of the created film, photographic printing with gravure ink consisting of urethane-based binder is performed.
The reproducibility was visually observed, and the adhesion of the ink was evaluated and confirmed by a cellophane tape peeling test. Evaluation criteria: ：: good △: slightly poor, but can be applied without any problem depending on the variety used. ×: Cannot be used

[0034]

[Table 1]

[0035]

EFFECTS OF THE INVENTION An additive for a surface layer, which has the drawbacks of heat-resistant lubrication and blocking properties, which are defects in surface properties, using linear low-density polyethylene polymerized with a low-density single-site catalyst having excellent stretchability. Although the type and amount of surface resin and the type of surface resin were the same, the grade was changed, and the improvement could be achieved by a three-layer, three-layer multilayer film subjected to stretching and heat setting. Further, the elasticity of the film was not found to be reduced by using a low-density resin of the same type as the central layer. Therefore, the center layer composed of linear low-density polyethylene composed of a relatively low density of 0.895 g / cm ³ polymerized using a single-site catalyst and the surface properties of other similar systems are relatively excellent. By appropriately adding a resin and an additive to a necessary layer, the excellent elasticity of the layer can be utilized to provide a stretch label film having improved surface properties.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a multilayer stretch label film of the present invention.

FIG. 2 is a schematic sectional view of a multilayer stretch label of the present invention.

FIG. 3 is a conceptual diagram illustrating a film forming process of a stretch film.

FIG. 4 is a conceptual diagram illustrating a process of creating a stretch label.

FIG. 5 is a conceptual diagram of a measuring instrument for explaining a method for evaluating heat-resistant slip properties.

[Description of Signs] 1 Central layer 2 Adhesion prevention layer 3 Surface layer 4 Picture layer 5 Joining part 10 Film for stretch label 6, 11 Stretch label 7 Adhesive 30 Dynamic friction measuring device 31 Plate heater 32 Metal sliding piece 35 Load cell 51 T Dies 52 Air knives 53, 56 Cooling roll 54 Preheating roll 55 Heating roll 60 Extending part 61 Heat fixing part 64, 65, 66 Nip roll M Vertical direction

Continued on the front page (72) Inventor Takayuki Ueki 1-1-1 Ichigaya-Kagacho, Shinjuku-ku, Tokyo F-term in Dai Nippon Printing Co., Ltd. (reference) 4F100 AA20A AA20C AH03B AH03C AK04A AK04B AK04C AK63A AK63B AK63C BA03 BA07 BA10A BA10C BA13 CA17A CA17C CA19B CA19C DE01A DE01C EJ37 EJ41 GB90 JA04A JJ03

Claims (4)

[Claims] 1. A stretch label comprising a polyethylene film formed by three types and three layers of co-extrusion film formation, comprising an adhesion preventing layer containing an antiblocking agent of fine particles having a melting point higher than that of said polyethylene, and a lubricant comprising a fatty acid amide. A film for a stretch label, which is a central layer and a lubricant comprising a fatty acid amide, or a laminate of a surface layer containing the lubricant and an antiblocking agent. 2. The method according to claim 1, wherein the polyethylene film is formed after film formation.
The stretch label film according to claim 1, wherein the film is stretched and heat-set in one direction of 5 to 15%. 3. The stretch label film according to claim 1, wherein the polyethylene film is a linear low-density polyethylene polymerized using a single-site catalyst. 4. The stretch label film according to claim 1, wherein the antiblocking agent is silica fine particles, and the lubricant is erucic acid amide and / or ethylene bisoleyl amide.