JP4612245B2 - Stretch label - Google Patents

Description

上記の表１において、ストレッチ適性に関する歪みの単位は、〔％〕であり、また、フィルムの引裂性に関する強度の単位は、〔Ｎ／ｍ〕である。
また、上記の表１において、 Ｎ．Ｄ．は、フィルムの引裂強度が高く、引裂荷重が決定できないことを意味する。
【００４３】
上記に示す結果より明らかなように、実施例１〜１３にかかるものは、ゲル分率を５〜８５％の範囲で調製し架橋させることにより、ストレッチラベルのカット性を向上させ、その作業性および生産性を著しく向上させることができるものであった。
更に、ストレッチラベルにとって重要な、ストレッチ適性（弾性回復性）を向上させることができ約７０℃の熱水における殺菌処理後も、ラベルは強固に密着して、脱落することはなかった。
よって、ストレッチラベルの生産性を阻害することなく、ボトル外周表面に強固に密接着して装着し得るストレッチラベルを製造し得るものであった。
【００４４】
【発明の効果】
以上の説明で明らかなように、本発明は、原反フィルムの両端部を重ね合わせ、その重合部を接合して接合部を形成し、更に、ボトル胴部の外周表面に装着する筒状のストレッチラベルにおいて、上記の原反フィルムとして、例えば、低密度ポリエチレン、直鎖状（線状）低密度ポリエチレン、あるいは、メタロセン触媒（シングルサイト触媒）を使用して重合したエチレン−α・オレフィン共重合体等のポリオレフィン系樹脂を使用し、これを、例えば、Ｔダイ押出機あるいはインフレ−ション成形機等を使用し、単層ないし共押出してポリオレフィン系樹脂の単独ないし共押出フィルムを製造し、次いで、該ポリオレフィン系樹脂の単独ないし共押出フィルムに、例えば、電子線照射装置等を使用し、その全面に電子線照射処理を施して、ゲル分率を５〜８５％の範囲で調整した架橋ポリオレフィン系樹脂フィルムを製造し、而して、該架橋ポリオレフィン系樹脂フィルムをストレッチラベルを構成する原反フィルムとして使用し、前述のように上記の架橋ポリオレフィン系樹脂フィルムの上に、印刷模様部等を形成して長尺状のラベル原反フィルムを製造し、次いで、該長尺状のラベル原反フィルムを、その横方向、あるいは、縦方向等にスリッタ−等を用いてカットしてストレッチラベルを構成するラベルフィルムを製造し、しかる後、該ラベルフィルムを、その両端部を重ね合わせて、その重合部を接着剤等を介して接合して接合部を形成して筒状のストレッチラベルを製造したところ、ストレッチラベルを構成する原反フィルムを横方向、あるいは、縦方向に、スリッタ−等を使用してカットする場合に、その原反フィルムが、スリッタ−等を用いて縦方向あるいは横方向等に切断するカット性に優れ、ラベル製造時の作業適性に何らの支障もなく、その作業能率を著しく向上させ、その生産性を高めることができ、更に、そのカット性に優れていることから、ラベルを構成する端部のカット面を美麗に仕上げることができ、大量のラベル不良品等の発生を阻止し、終極的には、その生産性を阻害することなく、更に、ストレッチラベルとしての自己伸縮性等を損なうことなく、ストレッチ性、耐熱性、強靱性、耐殺傷性、印刷適性等に優れ、フィルムの自己伸縮性を利用してボトル胴部の外周表面に強固に密接着して装着し得る極めて美麗なストレッチラベルを製造することができるというものである。
【図面の簡単な説明】
【図１】本発明にかかるストレッチラベルを構成する原反フィルムについてその層構成の概略を示す概略的断面図である。
【図２】従来のストレッチラベルの製造法についてその概略の構成を示す概略的構成図である。
【図３】従来のストレッチラベルの製造法についてその構成の概略を示す概略的構成図である。
【図４】従来のストレッチラベルの製造法についてその構成の概略を示す概略的構成図である。
【図５】従来のストレッチラベルの製造法についてその構成の概略を示す概略的構成図である。
【符号の説明】
１ ポリオレフィン系樹脂の単独ないし共押出フィルム
１ａ 架橋ポリオレフィン系樹脂フィルム
２ 電子線照射装置
３ 電子線
Ａ ストレッチラベルを構成する原反フィルム[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stretch label. More specifically, the raw film constituting the stretch label is excellent in cutability and can remarkably improve the workability at the time of producing the label. Furthermore, the stretch property, heat resistance, toughness The present invention relates to a very beautiful stretch label that has excellent properties, killing resistance, printability, etc., and can be attached to the outer peripheral surface of a bottle body by tightly adhering tightly using the self-stretchability of the film.
[0002]
[Prior art]
Conventionally, various types of labels have been developed and proposed as outer peripheral surfaces of various packaging containers made of plastic, glass, metal, etc., and one of them has been proposed. A stretch label that is attached to the outer peripheral surface of a packaging container by using the self-stretching property of the film is known.
Since this is self-stretching, it can follow changes in the dimensions of the packaging container, etc., and can maintain a close contact with the outer peripheral surface of the packaging container. Is easy to separate the packaging container and the label, can be separated and collected, has various advantages such as being suitable for the environment and being able to manufacture the label at a low cost.
Thus, as a film constituting a stretch label at present, for example, a raw film made of an ethylene-vinyl acetate copolymer heavy film having a vinyl acetate content of about 3 to 8% by weight and having a self-stretching property. Is the most commonly used.
Furthermore, a raw film made of a low-density polyethylene film having self-stretchability is also used.
[0003]
[Problems to be solved by the invention]
However, in the stretch label as described above, a self-stretchable ethylene-vinyl acetate copolymer heavy film constituting the stretch label, or a raw film such as a low density polyethylene film is a slitter (cutter) or the like. The film is inferior in cutability to cut the film in the vertical direction or the horizontal direction by using, so there is a problem that the workability at the time of label production is remarkably lacking, and the productivity is inferior, and further, the cutability is inferior Therefore, there is a problem that it is difficult to beautifully finish the cut surface of the end portion constituting the label.
Usually, as shown in FIG. 2, the stretch label is first, in the longitudinal direction (printing direction) X and the transverse direction Y, in order to take a plurality of stretch labels on the long original fabric film 11. A desired print pattern portion 12 composed of characters, graphics, symbols, patterns, etc., for example, by a printing method such as a gravure printing method, an offset printing method, a relief printing method, or the like at predetermined intervals Xa and Ya. , 12, 12, 12... Are repeatedly formed in multiple rows to produce a long label original film P.
Next, as shown in FIG. 3, a slitter or the like is used for the long label original film P produced as described above, with center lines La and La (see FIG. 2) at predetermined intervals Xa and Ya. The stretch label is formed on the upper and lower and left and right ends of the original film 11a which has the printed pattern portion 12a which constitutes the stretch label and is cut on the original fabric film 11a which constitutes the stretch label. A label film Q that constitutes a stretch label is manufactured by forming regions 13a and 13b that are made of the fabric surface of the constituting raw film 11a and that have an interval of 1/2 of the predetermined intervals Xa and Ya. .
Next, as shown in FIGS. 4 and 5, the label film Q produced as described above has the printed pattern portion 12 a of the original fabric film 11 a on the inner surface side, and the end on the inner surface side having the printed pattern portion 12 a. The adhesive layer 14 is formed on the surface, and the corona discharge treatment surface 15 is formed by performing corona discharge treatment on the end portion on the surface side of the raw film 11a (FIG. 4). The adhesive layer 14 and the surface of the corona discharge treatment surface are overlapped to face each other, and then both end portions of the superposed portion are joined via the adhesive layer or the like to form the joint portion 16. Thus, a cylindrical stretch label R that can be attached tightly to the outer peripheral surface of the bottle body is manufactured.
[0004]
In the above, although not shown in the drawing, a slitter or the like is used for the long label original film P manufactured above, and first, in the longitudinal direction at the center line La (see FIG. 2) with a predetermined interval Ya. Cut to produce a long strip original film 11a constituting a stretch label, and then print the printed pattern portion 12a of the long strip raw film 11a on the inner surface side. The adhesive layer 14 is formed on the inner surface side end portion having the pattern portion 12a, while the corona discharge treatment surface 15 is formed on the surface side end portion of the raw film 11a to form the corona discharge treatment surface 15. The both end portions are overlapped with the adhesive layer 14 and the corona discharge treatment surface 15 facing each other, and then the both end portions of the superposed portion are joined via the adhesive layer or the like. When the joining part 16 is formed and the cylinder is pasted A cylindrical stretch label R which can be cut by using a slitter or the like in the lateral direction at a center line La of a predetermined interval Xa and can be attached in close contact with the outer peripheral surface of the bottle body. (See FIGS. 2 to 5).
Thus, in the method of manufacturing a stretch label as described above, when the original film is cut in the horizontal direction or the vertical direction using a slitter or the like, the original film uses a slitter or the like. Inferior cutting ability to cut in the vertical or horizontal direction results in lack of workability at the time of label production, significantly lowering the work efficiency, inferior in productivity, and inferior in cutability. Therefore, it is extremely difficult to finish the cut surface of the end portion constituting the label beautifully, and as a result, a large amount of defective label products may be generated. , That would impede its productivity.
By the way, in order to improve the cut property of cutting the raw film in the vertical direction or the horizontal direction by using a slitter or the like, rubber elasticity (elasticity) is an important factor for self-stretchability as a stretch label. It is necessary to reduce the recovery property) and increase the tearability of the original film. However, as described above, if the rubber elasticity (elastic recovery property) is decreased and the tearability of the original film is increased, There is a problem in that the self-stretchability as a stretch label is lowered, and the stretch label itself loses its function as a stretch label and cannot withstand its use.
Therefore, the present invention is that the raw film constituting the stretch label is excellent in cutability and can remarkably improve the workability at the time of producing the label. Furthermore, the stretch property, heat resistance, toughness, kill resistance, printing The present invention provides an extremely beautiful stretch label that is excellent in suitability and the like, and can be attached by being tightly adhered tightly to the outer peripheral surface of the bottle body using the self-stretchability of the film.
[0005]
[Means for Solving the Problems]
As a result of various studies to solve the above-described problems relating to the stretch label, the present inventor has overlapped both end portions of the raw film, joined the overlapped portion, and formed a joined portion. For example, a low-density polyethylene, a linear (linear) low-density polyethylene, or a metallocene catalyst (single site catalyst) is used as the raw film in the cylindrical stretch label attached to the outer peripheral surface of the part. A polyolefin resin such as an ethylene-α / olefin copolymer that has been polymerized in a single layer or a coextrusion using, for example, a T-die extruder or an inflation molding machine. A single or coextruded film is manufactured, and then the polyolefin resin is single or coextruded film, for example, an electron beam irradiation device And the whole surface is subjected to electron beam irradiation treatment to produce a crosslinked polyolefin resin film having a gel fraction adjusted in the range of 5 to 85%, and thus the crosslinked polyolefin resin film is stretch-labeled. As described above, a printed pattern portion or the like is formed on the crosslinked polyolefin resin film as described above to produce a long label original film, and then the long film A label film constituting a stretch label is manufactured by cutting a sheet-shaped label original film using a slitter or the like in the horizontal direction or the vertical direction, and then the label film is attached to both ends thereof. Overlapping and joining the overlapped part with an adhesive or the like to form a joined part to produce a cylindrical stretch label, the raw fabric that forms the stretch label When the film is cut in the horizontal direction or in the vertical direction using a slitter or the like, the original film is excellent in cutting properties that can be cut in the vertical direction or the horizontal direction using a slitter or the like. There is no hindrance to work suitability at the time of manufacture, its work efficiency can be remarkably improved, its productivity can be improved, and furthermore, its cut property is excellent, so the cut surface of the end part constituting the label Can be finished beautifully, preventing the generation of a large number of defective labels, etc., and ultimately, without inhibiting the productivity, and without compromising the self-stretchability etc. as a stretch label Is a very beautiful stretch label that can be attached to the outer surface of the bottle body firmly and intimately using the film's self-stretchability, and has excellent heat resistance, heat resistance, toughness, killing resistance, and printability. Heading to one in which the present invention has been completed.
[0006]
That is, the present invention relates to the above-described original stretch label in which the both ends of the raw film are overlapped, the overlapped portion is joined to form a joined portion, and the tubular stretch label is attached to the outer peripheral surface of the bottle body. The present invention relates to a stretch label characterized in that the anti-film comprises a cross-linked polyolefin resin film having a gel fraction adjusted in the range of 5 to 85%.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The above-described present invention will be described in more detail below with reference to the drawings.
First, FIG. 1 is a schematic cross-sectional view showing an outline of a layer structure of a raw film constituting a stretch label according to the present invention, and FIGS. 2 to 5 show an outline of a conventional method for producing a stretch label. It is a schematic block diagram which shows the structure of these.
[0008]
In the stretch label according to the present invention, as shown in FIG. 1, as a raw film constituting the stretch label, for example, low density polyethylene, linear (linear) low density polyethylene, or metallocene catalyst (single site) A polyolefin resin such as an ethylene-α / olefin copolymer polymerized using a catalyst), and using, for example, a T-die extruder, an inflation molding machine, etc. The long and long polyolefin-based resin single or co-extruded film 1 is manufactured, and then the polyolefin-based resin single or co-extruded film 1 is used, for example, by using an electron beam irradiation device 2 or the like. An electron beam 3 of about 25 to 500 kGy is irradiated by about 1 Sec to 20 Sec and irradiated with an electron beam, and the gel fraction is set to 5 to 5 5% of the crosslinked polyolefin-based resin film 1a was adjusted from manufacture, and Thus, is to use a crosslinked polyolefin resin film 1a as raw film A constituting the stretch label.
[0009]
Alternatively, in the stretch label according to the present invention, although not shown, one or more of the above polyolefin resins are used, and for example, an organic peroxide such as dicumyl peroxide (dicumyl peroxide) is used. (About 2% by weight) and other additives are added to prepare a polyolefin-based resin composition, and then the resin composition is used. For example, a T-die extruder or a T-die co-extruder Single-layer or co-extrusion molding using an inflation extruder, inflation co-extrusion machine, etc. to produce a single or co-extruded film of a polyolefin resin, and then the polyolefin resin The single or coextruded film is put into a crosslinking apparatus at about 125 ° C. to 127 ° C., and then heated at about 160 ° C. for about 5 to 20 minutes by the crosslinking apparatus to carry out a crosslinking reaction. The cross-linking ratio is adjusted to produce a cross-linked polyolefin resin film having a gel fraction adjusted in the range of 5 to 85%. Thus, the cross-linked polyolefin resin film is used to form a stretch label. It is used as an anti-film.
Furthermore, in the present invention, as the cross-linked polyolefin resin film as the raw film constituting the stretch label according to the present invention, for example, water cross-linking with a silane cross-linked product polymer or cross-linking reaction with an oxazoline compound is used. Thus, a crosslinked polyolefin resin film having a gel fraction adjusted in the range of 5 to 85% can be produced.
[0010]
Thus, in the present invention, although not shown in the drawings, the cross-linked polyolefin resin film as the raw film produced as described above is used and, as described above, in order to take a plurality of stretch labels (printing) Desired) consisting of characters, figures, symbols, designs, etc. by printing methods such as gravure printing method, offset printing method, letterpress printing method, etc. Are repeatedly formed in multiple rows to produce a long label original film (see FIG. 2).
Next, using the slitter etc. about the long label original fabric film manufactured above, it cuts with the center line of a predetermined interval, and a stretch label is formed on the original fabric film which constitutes a stretch label. The upper and lower and left and right ends of the raw film forming the stretch label are formed from the fabric surface of the original film constituting the stretch label, and are formed at 1 / of the predetermined interval. The area | region which has a space | interval of 2 is formed, and the label film which comprises a stretch label is manufactured (refer FIG. 3).
Next, with respect to the label film produced above, the surface of the printed pattern portion of the original fabric film is the inner surface side, and an adhesive layer is formed on the inner surface side end portion having the printed pattern portion. A corona discharge treatment surface is formed on the end portion of the surface side of the substrate to form a corona discharge treatment surface, and then both end portions are overlapped with the adhesive layer and the corona discharge treatment surface facing each other. After that, a cylindrical stretch that can be attached to the outer peripheral surface of the bottle body by attaching both ends of the overlapped portion through the adhesive layer or the like to form a bonded portion. A label is manufactured (see FIGS. 4 and 5).
[0011]
Further, in the present invention, although not shown in the drawings, the long label original film produced above is first cut in the vertical direction at a center line at a predetermined interval in the vertical direction using a slitter or the like. , Producing a long strip original film that constitutes a stretch label, and then making the surface of the printed pattern portion of the long strip original film the inner surface side and having the printed pattern portion on the inner surface side On the other hand, an adhesive layer is formed on the end of the film, and a corona discharge treatment surface is formed on the end on the surface side of the raw film to form a corona discharge treatment surface. And the surface of the corona discharge treatment surface facing each other and then overlapping, and then joining both ends of the overlapped portion through the adhesive layer etc. to form a joined portion and sticking in a cylinder and laterally Use a slitter etc. in the horizontal direction at the center line of a predetermined interval of Cut, it is capable of producing a tubular stretch label can be mounted in close contact wear on the outer peripheral surface of the bottle body portion.
[0012]
Thus, in the present invention, although not shown, the tubular stretch label produced above is used, and the bottle body is stretched to about 10 to 25% using, for example, a stretcher or the like. The area composed of the fabric surface of the cross-linked polyolefin resin film, as well as the printed pattern part constituting the stretch label, is attached tightly to the outer peripheral surface of the bottle body, It is possible to manufacture a bottle with a stretch label that is worn.
[0013]
Next, the stretch label according to the present invention will be described with respect to the material constituting the stretch label, the production method, and the like. First, a crosslinked polyolefin resin film having a gel fraction adjusted in the range of 5 to 85% is described. Examples of the constituent polyolefin resin include low density polyethylene (LDPE), linear (linear) low density polyethylene (polymer polymerized using a multisite catalyst, LLDPE), metallocene catalyst (single site catalyst). Ethylene-α / olefin copolymer polymerized using styrene, medium density polyethylene (MDPE), high density polyethylene (HDPE), polypropylene resin, ethylene-polypropylene copolymer, ethylene-vinyl acetate copolymer, ethylene- Unsaturated carboxylic acid copolymer such as acrylic acid or methacrylic acid It can be used one or more resins other like.
[0014]
Thus, in the present invention, it is particularly preferable to use an ethylene-α / olefin copolymer polymerized using a metallocene catalyst (single site catalyst) as the polyolefin resin.
Examples of the ethylene-α / olefin copolymer polymerized using the above metallocene catalyst (single-site catalyst) include, for example, a combination of a metallocene complex such as a zirconocene dichloride and methylalumoxane, and an alumoxane. An ethylene-α-olefin copolymer obtained by polymerization using a catalyst, that is, a metallocene catalyst, can be used.
The above metallocene catalyst is also called a single-site catalyst because the current catalyst is called a multi-site catalyst with heterogeneous active sites, while the active sites are uniform. (Hereinafter, the metallocene catalyst and the single-site catalyst have the same meaning.)
[0015]
The ethylene-α-olefin copolymer polymerized using the above metallocene catalyst (single site catalyst) will be described in more detail. Specifically, for example, a catalyst comprising a combination of a metallocene transition metal compound and an organoaluminum compound. That is, an ethylene-α-olefin copolymer obtained by polymerization using a metallocene catalyst (including a so-called Kaminski catalyst) can be used.
In addition, said metallocene catalyst may be carry | supported and used for an inorganic substance.
In the above, examples of the metallocene transition metal compound include a transition metal selected from group IVB, specifically, titanium (Ti), zirconium (Zr), hafnium (Hf), cyclopentadienyl group, substituted cyclohexane. 1 to 2 of a pentadienyl group, an indenyl group, a substituted indenyl group, a tetrahydroindenyl group, a substituted tetrahydroindenyl group, a fluoronyl group, and a substituted fluorenyl group, or two of these groups Those covalently bonded are bonded, and in addition, hydrogen atom, oxygen atom, halogen atom, alkyl group, alkoxy group, aryl group, acetylacetonate group, carbonyl group, nitrogen molecule, oxygen molecule, Those having a ligand such as a Lewis base, a substituent containing a silicon atom, and an unsaturated hydrocarbon can be used. .
[0016]
In the above, as the organoaluminum compound, alkylaluminum, chain or cyclic aluminoxane, or the like can be used.
Here, as the alkylaluminum, for example, triethylaluminum, triisobutylaluminum, dimethylaluminum chloride, diethylaluminum chloride, methylaluminum dichloride, ethylaluminum dichloride, dimethylaluminum fluoride, diisobutylaluminum hydride, diethylaluminum hydride, ethylaluminum sesquichloride. Etc. can be used.
The chain or cyclic aluminoxane can be produced, for example, by bringing alkyl aluminum into contact with water.
For example, it can be produced by adding alkylaluminum at the time of polymerization and adding water later, or by reacting crystallization water of a complex salt or adsorbed water of an organic / inorganic compound with alkylaluminum.
Next, in the above, as the inorganic material for supporting the metallocene catalyst, for example, silica gel, zeolite, silicon earth or the like can be used.
[0017]
Next, in the above, as the polymerization method, for example, various polymerization methods such as bulk polymerization, solution polymerization, suspension polymerization, and gas phase polymerization can be used.
In addition, the polymerization may be any method such as a batch method or a continuous method.
In the above, as polymerization conditions, polymerization temperature, −100 to 250 ° C., polymerization time, 5 minutes to 10 hours, reaction pressure, normal pressure to 300 Kg / cm ² It is rank.
Further, in the present invention, examples of the α-olefin that is a comonomer copolymerized with ethylene include propylene, 1-butene, 3-methyl-1-butene, 4-methyl-1-pentene, 1-hexene, 1-octene, decene, etc. can be used.
The above α-olefins may be used alone or in combination of two or more.
Moreover, the mixing ratio of the above-mentioned α-olefin is, for example, 1 to 50% by weight, preferably 10 to 30% by weight.
Thus, in the present invention, the physical properties of the ethylene-α-olefin copolymer polymerized using the above metallocene catalyst are, for example, molecular weight, 5 × 10 ^Three ~ 5x10 ⁶ , Density, 0.905 to 0.940 g / cm ^Three , Melt flow rate [MFR], 0.1, preferably 1.0 to 6.0 g / 10 quantile.
In the present invention, the ethylene-α-olefin copolymer polymerized using the metallocene catalyst includes, for example, an antioxidant, an ultraviolet absorber, an antistatic agent, an antiblocking agent, a lubricant (fatty acid amide, etc.). ), Flame retardants, inorganic or organic fillers, dyes, pigments and the like can be optionally added and used.
[0018]
In the present invention, as the ethylene-α-olefin copolymer polymerized by using the above metallocene catalyst, specifically, trade name “Carnel” manufactured by Mitsubishi Chemical Corporation, manufactured by Mitsui Petrochemical Co., Ltd. Product name “Evolu”, product name “EXACT” manufactured by EXXON CHEMICAL, USA, product name “Affinity” manufactured by DOW CHEMICAL, USA, An ethylene-α-olefin copolymer such as trade name “ENGAGE” can be used.
[0019]
In the present invention, it is also preferable to use, for example, a linear (linear) low-density polyethylene synthesized from a transition metal catalyst and having no long-chain branching as the polyolefin-based resin.
In the present invention, as the linear (linear) polyethylene as described above, ethylene, for example, propylene, 1-butene, 3-methyl-1-butene, 4-methyl-1-pentene, 1- Copolymers with α-olefins such as hexene, 1-octene, and decene can be used.
Thus, in the present invention, the physical properties of the linear (linear) polyethylene are, for example, density, 0.905 to 0.940 g / cm. ^Three It is preferable to use a melt flow rate [MFR] having a property of 0.5 to 6.0 g / 10th.
[0020]
Next, in the present invention, a method for producing a crosslinked polyolefin-based resin film as a raw film constituting the stretch label according to the present invention using the material as described above will be described. One or more of the above-mentioned polyolefin resins are used, and for example, a T-die extruder, a T-die co-extruder, an inflation extruder, an inflation co-extruder, etc. are used. Single-layer or co-extrusion molding is carried out to produce a single or co-extruded film of polyolefin resin.
Next, in the present invention, a single or coextruded film of the polyolefin resin produced above is used, for example, using a known electron beam irradiation device, etc. ⁶⁰ Manufacture a cross-linked polyolefin resin film in which the gel fraction is adjusted within a range of 5 to 85% by irradiating an electron beam such as Co-γ rays with an electron dose of about 25 to 500 kGy for about 1 second to 20 seconds. To do.
In the above, if the electron beam irradiation dose is less than 25 kGy, it is not preferable because the film cutting property (labeler suitability) deteriorates. If the electron beam irradiation dose exceeds 500 kGy, a decomposed product For example, it is not preferable because odor or the like due to carboxylic acid or the like is generated.
[0021]
Alternatively, in the present invention, a method for producing a cross-linked polyolefin resin film as a raw film constituting the stretch label according to the present invention using the materials as described above, first, 1 of the aforementioned polyolefin resin. Use a seed or two or more, for example, add dicumyl peroxide to organic peroxide, other additives, etc. to prepare a polyolefin resin composition, and then use the resin composition Then, for example, using a T-die extruder, a T-die co-extruder, an inflation extruder, an inflation co-extruder, etc. A single or co-extruded film is produced, and then the single or co-extruded film of the polyolefin resin is placed in a crosslinking apparatus at about 125 ° C. to 127 ° C. A crosslinked polyolefin-based resin film in which the crosslinking reaction is caused by heating at about 160 ° C. for about 5 to 20 minutes with the crosslinking apparatus, the crosslinking rate is adjusted, and the gel fraction is adjusted in the range of 5 to 85%. Is to be manufactured.
Furthermore, in the present invention, a cross-linked polyolefin resin film having a gel fraction adjusted in the range of 5 to 85% by using water cross-linking with a silane cross-linked polymer, cross-linking reaction with an oxazoline compound, or the like is produced. It is.
In the present invention, the film thickness of the crosslinked polyolefin resin film is preferably about 20 μm to 200 μm, and preferably about 30 μm to 100 μm.
[0022]
Next, in the present invention, in the cross-linked polyolefin resin film constituting the stretch label, for example, when forming the film, processability, heat resistance, weather resistance, mechanical properties, dimensional stability of the film Various plastic compounding agents and additives are added for the purpose of improving and modifying properties, antioxidant properties, slipping properties, mold release properties, flame retardancy, antifungal properties, electrical properties, strength, etc. The addition amount can be arbitrarily added from a very small amount to several tens of percent depending on the purpose.
In the above, the compounding agent or additive includes, for example, a lubricant, a crosslinking agent, an antioxidant, an ultraviolet absorber, a light stabilizer, a filler, a reinforcing agent, an antistatic agent, a flame retardant, a flame retardant, a foaming agent, an anti-proofing agent. Molding agents, pigments, dispersants, surfactants, anti-blocking agents, and the like can be used, and a modifying resin can also be used.
In the present invention, as the cross-linked polyolefin resin film constituting the stretch label, a film that is stretched in a uniaxial or biaxial direction after film formation and then thermally fixed can be used. Preferably, it is preferable to use a cross-linked polyolefin resin film that is stretched by about 5 to 15% in the uniaxial direction and then heat-set.
[0023]
In the above, as the compounding agent or additive, specifically, a lubricant having its own lubricity and less migration in the resin can be used. For example, liquid paraffin, white petrolatum, Waxes such as petroleum wax, microcrystalline wax, montan wax, polyethylene wax, higher fatty acids having 8 to 22 carbon atoms, higher fatty acid aluminum, higher fatty acid calcium, higher fatty acid magnesium higher fatty acid zinc, higher fatty acid lithium, etc. Aliphatic acids such as higher fatty acids or metal salts thereof, linear aliphatic monovalent alcohols having 8 to 18 carbon atoms, glycerin, sorbitol, propylene glycol, pentaerythritol, triethylene glycol, etc. Alcohols, higher fatty acids having 4 to 22 carbon atoms and linear aliphatic monovalent acids having 8 to 18 carbon atoms Esters with callol, acetyldributyl citrate, di-2-ethyl-hexyl adipate, azelaic acid-n-hexyl, ethanediol montanate, poly (1.3-butanediol adipate) ester, acetylricino Methyl sulfate, poly (1.3-butylene glycol, 1.4-butylene glycol, octyl alcohol adipate) ester, ester of sugar sugar and fatty acid, for hydrogenated food Fats and oils, castor oil, spam acetyl wax, glycerides of acetylated monoglyceride sugar, ethylene bis-fatty acid amide represented by, for example, ethylene bisoleyl amide having 16 to 18 carbon atoms, higher fatty acid amide having 8 to 22 carbon atoms, Higher fats such as stearyl erucamide, erucic acid amide, oleyl palmitoamide One or more amides, other glycerin esters of silicone oils such as methylhydrodiene polysiloxane, dimethylpolysiloxane, methylphenylpolysiloxane, polyoxyalkylene / dimethylpolysiloxane, and maleic acid-modified rosin Can be used.
In the present invention, among the lubricants as described above, in particular, erucic acid amide, ethylene bis oleyl amide, stearic acid amide, oleic acid amide, methylene bis stearic acid amide, etc. themselves have lubricity, It is a very effective material.
As the addition amount of the above-mentioned lubricant, it is preferable to add at a ratio of about 0.08 wt% to 10.0 wt% with respect to 100 parts by weight of the resin.
[0024]
In the present invention, other oxides such as aluminum oxide, magnesium oxide, silica, calcium oxide, titanium oxide, and zinc oxide; hydroxides such as aluminum hydroxide, magnesium hydroxide, and calcium hydroxide; Carbonates such as magnesium and calcium carbonate, sulfates such as calcium sulfate and barium sulfate, silicates such as magnesium silicate, aluminum silicate, calcium silicate and aluminosilicate, and others, kaolin, talc, diatomaceous earth, etc. Anti-blocking agent based on inorganic compounds, or high-density polyethylene, ultra-high molecular weight polyethylene having a molecular weight of 300000 or more, polypropylene, polycarbonate, polyamide, polyester, melamine resin, diallyl phthalate resin, acrylic resin, etc. Organic consisting of fine powder It one free of compounds based antiblocking agents can be added two or more.
The addition amount is preferably about 0.01 to 3% by weight with respect to 100 parts by weight of the resin.
[0025]
Next, in the stretch label according to the present invention, the cross-linked polyolefin resin film as the raw film constituting the stretch label according to the present invention is printed with characters, figures, symbols, patterns, etc. A pattern part is formed.
Thus, in the present invention, the printed pattern portion is, for example, a normal gravure printing ink, offset printing ink, letterpress printing ink, or the like, for example, normal gravure, offset, letterpress, etc. Depending on the printing method, a desired printed pattern composed of characters, figures, symbols, patterns, etc. can be printed on the back side.
In the present invention, the surface of the upper and / or lower end portions of the inner surface of the cross-linked polyolefin resin film as the raw film constituting the stretch label, and the surfaces of the left and right end portions thereof, That is, the stretch label according to the present invention is formed on the surface of the end of the entire circumference, when a region composed of a cloth polyolefin polyolefin resin film is formed across the entire length and width of about 1 mm to 10 mm. When the is attached to the outer peripheral surface of the bottle body portion, the fabric surface and the outer peripheral surface of the bottle body portion can be tightly bonded, which is preferable because of the effects such as prevention of dropping off of the label.
[0026]
Next, in the stretch label according to the present invention, the cross-linked polyolefin resin film is overlapped with the printed pattern portion on the inner surface side, and then the both ends of the polymerized portion are overlapped. For example, when a stretch label is manufactured by bonding using an adhesive or the like to form a stretch label, for example, the cross-linked polyolefin resin film has, for example, corona discharge treatment, ozone Treatment, plasma discharge treatment, frame treatment, sandblast treatment, chemical treatment, preheat treatment, ultraviolet irradiation treatment, high frequency heat treatment, electromagnetic induction heat treatment, microwave treatment, anchor coating agent coat And pre-processing such as other processing can be performed arbitrarily.
In the present invention, examples of the adhesive used for joining both ends of the crosslinked polyolefin resin film include polyurethane resins, polyamide resins, polyacrylic resins, polyvinyl acetate resins, and cellulose. It is possible to use a resin-based adhesive having a resin as a main component of a vehicle, such as a resin based resin, an epoxy resin, or the like.
[0027]
Next, in the present invention, as the cylindrical outer diameter constituting the stretch label, it is preferable to form an outer diameter slightly smaller than the outer diameter of the bottle body to form a cylindrical stretch label. .
In the present invention, when the cylindrical stretch label is attached to the outer peripheral surface of the bottle body, the outer diameter of the cylindrical stretch label is tensioned and expanded using a stretcher or the like. It is to be installed with.
Thus, when the stretch label is attached to the outer peripheral surface of the bottle body, the stretch label is brought into close contact with the outer surface of the bottle body by the self-elastic stretching force of the polyolefin resin film constituting the stretch label. It is mounted in a tightly bonded state.
[0028]
In the present invention, after attaching the stretch label to the outer peripheral surface of the bottle body as described above, the bottle is filled and packaged with contents such as carbonated beverages, fruit juice, and the like, and then capped and sealed, After that, for example, even if a hot water shower or the like at about 70 ° C. is diffused for 10 minutes and sterilized (pasteurized), the tight adhesion of the stretch label to the outer surface of the bottle body is not inferior. Both of them are tightly bonded tightly, and the stretch label does not slip off from the outer surface of the bottle body, so that it has excellent characteristics such as toughness, surface killing resistance, etc. The stretch label can be very well attached to the outer surface of the bottle body.
In the present invention, of course, in the above description, the contents can be filled and a stretch label can be attached after the sterilization treatment.
Thus, in the present invention, after the bottle is used, the bottle and the stretch label can be separated and collected very easily and easily.
[0029]
In the present invention, the stretch label according to the present invention can be applied to bottle containers made of various forms such as plastic, glass, metal, and the like. It is preferably applied to a stretch blow molded container made of terephthalate resin, polypropylene resin, polyethylene resin or the like.
In the present invention, the contents filled and packaged in the bottle may include various drinks such as carbonated drinks, fruit juices, seasonings, and the like, chemicals or pharmaceuticals, and the like.
[0030]
【Example】
Next, the present invention will be described in more detail with specific examples.
Example 1
First, an ethylene-α-olefin copolymer polymerized using a metallocene catalyst (density, 0.917 g / m ^Three ) 100.0 parts by weight, 0.5 parts by weight of synthetic silica (anti-blocking agent), 0.05 parts by weight of erucamide (lubricant), 0.05 parts by weight of ethylenebisoleylamide (lubricant) and synthetic silica (anti-blocking) Agent) A resin composition was prepared by sufficiently kneading 0.5 parts by weight.
Next, using the resin composition prepared above, using a multi-manifold type T-die extruder, an unstretched resin film consisting of a single-layer film of 80 μm was manufactured, and then the unstretched The resin film was stretched about 10% in the uniaxial direction while passing between heating rolls, and then heat-set to produce a long resin film.
Next, an electron beam irradiation apparatus (manufactured by Iwasaki Electric Co., Ltd., model name, Electron Carten EC300 / 60 / 120S) is used on the entire surface of the resin film produced above, with a voltage of 250 KEV, a current of 12 mA, and a distance of 40 mm. A 25 [kGy] electron beam was irradiated for 1 second to produce a long resin film having a gel fraction of about 5% which had been cross-linked with an electron beam.
The gel fraction was measured on a stainless steel mesh filter sample (electron beam cross-linked long resin film 5 × 5 cm). ² ), Heated to reflux with boiling toluene for 3 hours, then filtered through a filter, and the extraction residue in the filter was dried under reduced pressure, and its weight fraction was measured to obtain a gel fraction.
Hereinafter, in the present invention, the gel fraction is measured in the same manner as described above.
Next, gravure printing ink is used on one side of the long resin film cross-linked with the electron beam as described above, and a predetermined print pattern composed of characters, symbols, figures, patterns, etc. is arranged in three rows by a gravure printing method. And it printed repeatedly for every pattern unit which comprises a label for every row | line | column, and manufactured the elongate label original fabric film.
Next, using the slitter, the long label original film produced above is 8 mm at each of the vertical and horizontal ends at the center line of the interval separating each row in the vertical direction and the horizontal direction. A label film constituting one stretch label was produced by cutting the resin film so that the fabric surface was exposed.
Furthermore, the label film produced above is bonded by applying an adhesive made of a two-component curable polyurethane resin to the end of the inner surface side having the printed pattern portion, with the surface of the printed pattern portion being the inner surface side. On the other hand, the corona discharge treatment surface is formed on the end portion on the surface side of the film to form a corona discharge treatment surface, and then both end portions of the adhesive layer and the corona discharge treatment surface are formed. Then, the both ends of the overlapped part are joined via the adhesive layer etc. to form a joined part, thereby closely adhering to the outer peripheral surface of the bottle body part. A cylindrical stretch label that can be attached to the body was manufactured.
Next, the cylindrical stretch label produced above is used, and this is expanded by about 15% using a stretcher, and the outer periphery of the body of the stretch blow molding container made of polyethylene terephthalate. Mounted on the surface.
Furthermore, in the above-mentioned stretch blow-molded container made of polyethylene terephthalate equipped with a stretch label, the carbonated beverage is filled and packaged, and after capping, about 70 ° C. hot water is diffused for 10 minutes to sterilize it. The label was firmly and closely adhered to the outer peripheral surface of the bottle body, and no dropout was observed.
After the bottle was used, it was peeled off with the stretch label, and the stretch label was peeled off from the portion and could be easily separated into a bottle and a strech label.
In the above, when the long label original film was cut in the horizontal direction and the vertical direction using a slitter, the cut surface could be cut beautifully without any trouble.
[0031]
In addition, in the above, the long label original film produced by applying the printed pattern as described above is formed on the left and right ends by using a slitter in the longitudinal direction at the center line of the interval separating each row. Each 8 mm multilayer coextruded resin film is cut so that the fabric surface is exposed to produce a long label film, and then has the printed pattern portion on the inner surface side. An adhesive layer is formed by applying an adhesive made of a two-component curing type polyurethane resin to the end portion on the inner surface side, and on the other hand, the corona discharge treatment surface is applied to the end portion on the surface side of the film. After that, the both end portions are overlapped with the adhesive layer and the corona discharge treatment surface facing each other, and then both end portions of the polymerized portion are passed through the adhesive layer and the like. To form a joint and produce a cylindrical body Label attaching machine of the cutter while - was cut in the transverse direction was used to produce a tubular stretch label can be mounted in close contact wear on the outer peripheral surface of the bottle body portion continuous.
Next, the cylindrical stretch label produced above is used, and this is expanded by about 15% using a stretcher, and the outer periphery of the body of the stretch blow molding container made of polyethylene terephthalate. Mounted on the surface.
Furthermore, in the above-mentioned stretch blow-molded container made of polyethylene terephthalate equipped with a stretch label, a carbonated beverage is filled and packaged, and after capping, about 70 ° C. hot water is diffused for 10 minutes to sterilize it. The label was firmly and closely adhered to the outer peripheral surface of the bottle body, and no dropout was observed.
After the bottle was used, it was peeled off with the stretch label, and the stretch label was peeled off from the portion and could be easily separated into a bottle and a strech label.
In addition, in the above, when using a slitter and cut | disconnecting to a horizontal direction and a vertical direction, it was able to cut the cut surface beautifully without trouble.
[0032]
Example 2 to Example 6
In Example 1 above, an electron beam irradiation device (manufactured by Iwasaki Electric Co., Ltd., model name, Electron Carten EC300 / 60 / 120S) is used on the entire surface of the resin film, and an electron beam of 25 [kGy] is 1 Instead of producing an electron beam cross-linked long resin film having a gel fraction of about 5% by performing irradiation treatment for 2 seconds, the same as in Example 1 above under the electron beam irradiation conditions shown below A long resin film cross-linked with an electron beam having the gel fraction shown below was produced. Except that, the same results as in Example 1 were obtained in exactly the same manner as in Example 1 above.
Example 2 50 [kGy] electron beam, irradiation time 2 seconds, gel fraction 15%
Example 3 100 [kGy] electron beam, irradiation time 4 seconds, gel fraction 35%
Example 4 200 [kGy] electron beam, irradiation time 8 seconds, gel fraction 65%
Example 5 300 [kGy] electron beam, irradiation time 12 seconds, gel fraction 80%
Example 6 500 [kGy] electron beam, irradiation time 20 seconds, gel fraction 85%
[0033]
Example 7
First, the following resin compositions (a) to (c) were prepared.
(I). Ethylene-α-olefin copolymer polymerized using a single site catalyst (density, 0.925 g / m ^Three ) 100.0 parts by weight and synthetic silica (anti-blocking agent) 0.5 parts by weight were sufficiently kneaded to prepare a resin composition.
(B). Low density polyethylene (LDPE, density, 0.920 g / m ^Three ) Ethylene-α-olefin copolymer polymerized using 30.0 parts by weight and a single-site catalyst (density, 0.917 g / m ^Three ) 70.0 parts by weight and erucic acid amide (lubricant) 0.05 parts by weight were sufficiently kneaded to prepare a resin composition.
(C). Low density polyethylene (LDPE, density, 0.920 g / m ^Three ) Ethylene-α-olefin copolymer polymerized using 30.0 parts by weight and a single-site catalyst (density, 0.917 g / m ^Three ) 70.0 parts by weight, 0.05 part by weight of erucamide (lubricant), 0.05 part by weight of ethylenebisoleylamide (lubricant) and 0.5 part by weight of synthetic silica (anti-blocking agent) A resin composition was prepared.
Next, using the resin composition prepared above, using a multi-manifold type T-die co-extruder, the layer made of the resin composition (a) is 20 μm, and the resin composition (b) is used. A layer of 50 μm and (c) the resin composition layer were coextruded to 20 μm to produce an unstretched resin film consisting of three layers, and then the unstretched resin film was passed between heating rolls. However, it was stretched about 10% in the uniaxial direction and then heat-set to produce a long multilayer coextruded resin film.
Hereinafter, an electron beam irradiation device (Iwasaki Electric Co., Ltd., model name, Electron Carten EC300 / 60 / 120S) was used, and a 200 [kGy] electron beam was applied for 8 seconds in the same manner as in Example 1 above. The same results as in Example 1 above, except that the irradiation treatment is performed to produce an electron beam cross-linked long resin film having a gel fraction of about 65%. Got.
[0034]
Example 8
First, the following resin compositions (a) to (c) were prepared.
(I). Ethylene-α-olefin copolymer polymerized using a single site catalyst (density, 0.925 g / m ^Three ) 100.0 parts by weight and synthetic silica (anti-blocking agent) 0.5 parts by weight were sufficiently kneaded to prepare a resin composition.
(B). Low density polyethylene (LDPE, density, 0.920 g / m ^Three ) Ethylene-α-olefin copolymer polymerized using 70.0 parts by weight and a single site catalyst (density, 0.917 g / m ^Three ) 30.0 parts by weight and erucic acid amide (lubricant) 0.05 parts by weight were sufficiently kneaded to prepare a resin composition.
(C). Low density polyethylene (LDPE, density, 0.920 g / m ^Three ) Ethylene-α-olefin copolymer polymerized using 30.0 parts by weight and a single-site catalyst (density, 0.917 g / m ^Three ) 70.0 parts by weight, 0.05 part by weight of erucamide (lubricant), 0.05 part by weight of ethylenebisoleylamide (lubricant) and 0.5 part by weight of synthetic silica (anti-blocking agent) A resin composition was prepared.
Next, using the resin composition prepared above, using a multi-manifold type T-die co-extruder, the layer made of the resin composition (a) is 20 μm, and the resin composition (b) is used. A layer of 50 μm and (c) the resin composition layer were coextruded to 20 μm to produce an unstretched resin film consisting of three layers, and then the unstretched resin film was passed between heating rolls. However, it was stretched about 10% in the uniaxial direction and then heat-set to produce a long multilayer coextruded resin film.
Hereinafter, an electron beam irradiation device (Iwasaki Electric Co., Ltd., model name, Electron Carten EC300 / 60 / 120S) was used, and a 200 [kGy] electron beam was applied for 8 seconds in the same manner as in Example 1 above. The same results as in Example 1 above, except that the irradiation treatment is performed to produce an electron beam cross-linked long resin film having a gel fraction of about 70%. Got.
[0035]
Example 9
First, the following resin compositions (a) to (c) were prepared.
(I). Ethylene-α-olefin copolymer polymerized using a single site catalyst (density, 0.925 g / m ^Three ) 100.0 parts by weight and synthetic silica (anti-blocking agent) 0.5 parts by weight were sufficiently kneaded to prepare a resin composition.
(B). Low density polyethylene (LDPE, density, 0.920 g / m ^Three 100.0 parts by weight and erucic acid amide (lubricant) 0.05 parts by weight were sufficiently kneaded to prepare a resin composition.
(C). Low density polyethylene (LDPE, density, 0.920 g / m ^Three ) Ethylene-α-olefin copolymer polymerized using 30.0 parts by weight and a single-site catalyst (density, 0.917 g / m ^Three ) 70.0 parts by weight, 0.05 part by weight of erucamide (lubricant), 0.05 part by weight of ethylenebisoleylamide (lubricant) and 0.5 part by weight of synthetic silica (anti-blocking agent) A resin composition was prepared.
Next, using the resin composition prepared above, using a multi-manifold type T-die co-extruder, the layer made of the resin composition (a) is 20 μm, and the resin composition (b) is used. A layer of 50 μm and (c) the resin composition layer were coextruded to 20 μm to produce an unstretched resin film consisting of three layers, and then the unstretched resin film was passed between heating rolls. However, it was stretched about 10% in the uniaxial direction and then heat-set to produce a long multilayer coextruded resin film.
Hereinafter, an electron beam irradiation device (Iwasaki Electric Co., Ltd., model name, Electron Carten EC300 / 60 / 120S) was used, and a 200 [kGy] electron beam was applied for 8 seconds in the same manner as in Example 1 above. The same results as in Example 1 above, except that the irradiation treatment is performed to produce an electron beam cross-linked long resin film having a gel fraction of about 70%. Got.
[0036]
Example 10
First, low density polyethylene (LDPE, density, 0.925 g / m ^Three ) 100.0 parts by weight, 0.5 parts by weight of synthetic silica (anti-blocking agent), 0.05 parts by weight of erucamide (lubricant), 0.05 parts by weight of ethylenebisoleylamide (lubricant) and synthetic silica (anti-blocking) Agent) A resin composition was prepared by sufficiently kneading 0.5 parts by weight.
Next, using the resin composition prepared above, using a multi-manifold type T-die extruder, an unstretched resin film consisting of a single-layer film of 80 μm was manufactured, and then the unstretched The resin film was stretched about 10% in the uniaxial direction while passing between heating rolls, and then heat-set to produce a long resin film.
Next, on the entire surface of the resin film produced above, an electron beam irradiation device (Iwasaki Electric Co., Ltd., model name, Electron Carten EC300 / 60 / 120S) was used in the same manner as in Example 1 above. , 200 [kGy] electron beam was irradiated for 8 seconds to produce an electron beam-crosslinked long resin film having a gel fraction of about 65%.
Thereafter, the same operation as in Example 1 was performed, and the same result as in Example 1 was obtained.
[0037]
Example 11
First, the following resin compositions (a) to (c) were prepared.
(I). Ethylene-α-olefin copolymer polymerized using a single site catalyst (density, 0.925 g / m ^Three ) 100.0 parts by weight, 0.05 parts by weight of erucic acid amide (lubricant), 0.05 parts by weight of ethylenebisoleylamide (lubricant) and 0.5 parts by weight of synthetic silica (anti-blocking agent) are sufficiently kneaded. A resin composition was prepared.
(B). Low density polyethylene (LDPE, density, 0.920 g / m ^Three ) Ethylene-α-olefin copolymer polymerized using 30.0 parts by weight and a single-site catalyst (density, 0.917 g / m ^Three ) 70.0 parts by weight and erucic acid amide (lubricant) 0.05 parts by weight were sufficiently kneaded to prepare a resin composition.
(C). Low density polyethylene (LDPE, density, 0.920 g / m ^Three ) Ethylene-α-olefin copolymer polymerized using 30.0 parts by weight and a single-site catalyst (density, 0.917 g / m ^Three ) 70.0 parts by weight and synthetic silica (anti-blocking agent) 0.5 parts by weight were sufficiently kneaded to prepare a resin composition.
Next, using the resin composition prepared above, using a multi-manifold type T-die co-extruder, the layer made of the resin composition (a) is 20 μm, and the resin composition (b) is used. A layer of 50 μm and (c) the resin composition layer were coextruded to 20 μm to produce an unstretched resin film consisting of three layers, and then the unstretched resin film was passed between heating rolls. However, it was stretched about 10% in the uniaxial direction and then heat-set to produce a long multilayer coextruded resin film.
Hereinafter, an electron beam irradiation device (Iwasaki Electric Co., Ltd., model name, Electron Carten EC300 / 60 / 120S) was used, and a 200 [kGy] electron beam was applied for 8 seconds in the same manner as in Example 1 above. The same results as in Example 1 above, except that the irradiation treatment is performed to produce an electron beam cross-linked long resin film having a gel fraction of about 65%. Got.
[0038]
Example 12
First, the following resin compositions (a) to (c) were prepared.
(I). Ethylene-α-olefin copolymer polymerized using a single site catalyst (density, 0.925 g / m ^Three ) 100.0 parts by weight, 0.05 parts by weight of erucic acid amide (lubricant), 0.05 parts by weight of ethylenebisoleylamide (lubricant) and 0.5 parts by weight of synthetic silica (anti-blocking agent) are sufficiently kneaded. A resin composition was prepared.
(B). Low density polyethylene (LDPE, density, 0.920 g / m ^Three ) Ethylene-α-olefin copolymer polymerized using 70.0 parts by weight and a single site catalyst (density, 0.917 g / m ^Three ) 30.0 parts by weight and erucic acid amide (lubricant) 0.05 parts by weight were sufficiently kneaded to prepare a resin composition.
(C). Low density polyethylene (LDPE, density, 0.920 g / m ^Three ) Ethylene-α-olefin copolymer polymerized using 30.0 parts by weight and a single-site catalyst (density, 0.917 g / m ^Three ) 70.0 parts by weight and synthetic silica (anti-blocking agent) 0.5 parts by weight were sufficiently kneaded to prepare a resin composition.
Next, using the resin composition prepared above, using a multi-manifold type T-die co-extruder, the layer made of the resin composition (a) is 20 μm, and the resin composition (b) is used. A layer of 50 μm and (c) the resin composition layer were coextruded to 20 μm to produce an unstretched resin film consisting of three layers, and then the unstretched resin film was passed between heating rolls. However, it was stretched about 10% in the uniaxial direction and then heat-set to produce a long multilayer coextruded resin film.
Hereinafter, an electron beam irradiation device (Iwasaki Electric Co., Ltd., model name, Electron Carten EC300 / 60 / 120S) was used, and a 200 [kGy] electron beam was applied for 8 seconds in the same manner as in Example 1 above. The same results as in Example 1 above, except that the irradiation treatment is performed to produce an electron beam cross-linked long resin film having a gel fraction of about 70%. Got.
[0039]
Example 13
First, the following resin compositions (a) to (c) were prepared.
(I). Ethylene-α-olefin copolymer polymerized using a single site catalyst (density, 0.925 g / m ^Three ) 100.0 parts by weight, 0.05 parts by weight of erucic acid amide (lubricant), 0.05 parts by weight of ethylenebisoleylamide (lubricant) and 0.5 parts by weight of synthetic silica (anti-blocking agent) are sufficiently kneaded. A resin composition was prepared.
(B). Low density polyethylene (LDPE, density, 0.920 g / m ^Three 100.0 parts by weight and erucic acid amide (lubricant) 0.05 parts by weight were sufficiently kneaded to prepare a resin composition.
(C). Low density polyethylene (LDPE, density, 0.920 g / m ^Three ) Ethylene-α-olefin copolymer polymerized using 30.0 parts by weight and a single-site catalyst (density, 0.917 g / m ^Three ) 70.0 parts by weight and synthetic silica (anti-blocking agent) 0.5 parts by weight were sufficiently kneaded to prepare a resin composition.
Next, using the resin composition prepared above, using a multi-manifold type T-die co-extruder, the layer made of the resin composition (a) is 20 μm, and the resin composition (b) is used. A layer of 50 μm and (c) the resin composition layer were coextruded to 20 μm to produce an unstretched resin film consisting of three layers, and then the unstretched resin film was passed between heating rolls. However, it was stretched about 10% in the uniaxial direction and then heat-set to produce a long multilayer coextruded resin film.
Hereinafter, an electron beam irradiation device (Iwasaki Electric Co., Ltd., model name, Electron Carten EC300 / 60 / 120S) was used, and a 200 [kGy] electron beam was applied for 8 seconds in the same manner as in Example 1 above. The same results as in Example 1 above, except that the irradiation treatment is performed to produce an electron beam cross-linked long resin film having a gel fraction of about 70%. Got.
[0040]
Comparative Example 1
First, an ethylene-α-olefin copolymer polymerized using a metallocene catalyst (density, 0.917 g / m ^Three ) 100.0 parts by weight, 0.5 parts by weight of synthetic silica (anti-blocking agent), 0.05 parts by weight of erucamide (lubricant), 0.05 parts by weight of ethylenebisoleylamide (lubricant) and synthetic silica (anti-blocking) Agent) A resin composition was prepared by sufficiently kneading 0.5 parts by weight.
Next, using the resin composition prepared above, using a multi-manifold type T-die extruder, an unstretched resin film consisting of a single-layer film of 80 μm was manufactured, and then the unstretched The resin film was stretched about 10% in the uniaxial direction while passing between heating rolls, and then heat-set to produce a long resin film.
Next, on one side of the long resin film produced above, gravure printing ink is used, and in a gravure printing method, predetermined printing patterns composed of characters, symbols, figures, pictures, etc. are arranged in three rows, and For each row, printing was repeated for each pattern unit constituting the label to produce a long label original film.
Next, using the slitter, the long label original film produced above is 8 mm at each of the vertical and horizontal ends at the center line of the interval separating each row in the vertical direction and the horizontal direction. A label film constituting one stretch label was produced by cutting the resin film so that the fabric surface was exposed.
Furthermore, the label film produced above is bonded by applying an adhesive made of a two-component curable polyurethane resin to the end of the inner surface side having the printed pattern portion, with the surface of the printed pattern portion being the inner surface side. On the other hand, the corona discharge treatment surface is formed on the end portion on the surface side of the film to form a corona discharge treatment surface, and then both end portions of the adhesive layer and the corona discharge treatment surface are formed. Then, the both ends of the overlapped part are joined via the adhesive layer etc. to form a joined part, thereby closely adhering to the outer peripheral surface of the bottle body part. A cylindrical stretch label that can be attached to the body was manufactured.
Next, the cylindrical stretch label produced above is used, and this is expanded by about 15% using a stretcher, and the outer periphery of the body of the stretch blow molding container made of polyethylene terephthalate. Mounted on the surface.
Furthermore, in the above-mentioned stretch blow-molded container made of polyethylene terephthalate equipped with a stretch label, the carbonated beverage is filled and packaged, and after capping, about 70 ° C. hot water is diffused for 10 minutes to sterilize it. The label was firmly and closely adhered to the outer peripheral surface of the bottle body, and no dropout was observed.
However, when a long label original film is cut in a horizontal direction and a vertical direction using a slitter, the cut property is hindered, and labels that cannot be cut frequently occur.
Moreover, even when cut, the cut surface was very irregular because it pulled the yarn, and it could be cut beautifully.
[0041]
Experimental example
The following physical properties of the stretch labels produced in Examples 1 to 13 and Comparative Example 1 were measured.
(1). Measuring stretch label suitability
This was measured for instantaneous residual strain and permanent strain when the film was stretched 25% (based on JIS-K-7127).
As a measuring machine, Tensilon RTC-1310A manufactured by Orientec Co., Ltd. was used.
(2). Cutability measurement
This was measured using a JIS-K-7128 Elmendorf tear tester.
As a measuring machine, an Elmendorf tear tester manufactured by Tester Sangyo Co., Ltd. was used.
In the above measurement, the test direction was measured in the label horizontal direction (TD) for stretch label suitability, and in the label vertical direction (MD) and label horizontal direction (TD) for cutability.
The measurement results of the gel fraction are shown in Table 1 below.
[0042]

In Table 1 above, the unit of strain related to stretch suitability is [%], and the unit of strength related to tearability of the film is [N / m].
In Table 1 above, N.I. D. Means that the tear strength of the film is high and the tear load cannot be determined.
[0043]
As is clear from the results shown above, the samples according to Examples 1 to 13 were prepared by crosslinking the gel fraction in the range of 5 to 85%, thereby improving the cut property of the stretch label, and its workability. And productivity could be remarkably improved.
Furthermore, the stretch suitability (elastic recovery property), which is important for the stretch label, can be improved, and the label is firmly adhered and does not fall off even after sterilization treatment in hot water at about 70 ° C.
Therefore, it was possible to produce a stretch label that can be attached by being tightly adhered to the outer peripheral surface of the bottle without impairing the productivity of the stretch label.
[0044]
【The invention's effect】
As is apparent from the above description, the present invention is a cylindrical shape that overlaps both ends of the raw film, joins the overlapping portions to form a joined portion, and further attaches to the outer peripheral surface of the bottle body. In stretch labels, for example, low-density polyethylene, linear (linear) low-density polyethylene, or ethylene-α / olefin copolymer polymerized using a metallocene catalyst (single site catalyst) as the above-mentioned raw film. Polyolefin resin such as coalescence is used, and this is used, for example, using a T-die extruder or an inflation molding machine to produce a single layer or coextrusion of a polyolefin resin alone or a coextruded film, The polyolefin resin alone or coextruded film is subjected to, for example, an electron beam irradiation apparatus and the like, and the entire surface thereof is subjected to electron beam irradiation treatment. A crosslinked polyolefin resin film having a gel fraction adjusted in the range of 5 to 85% is produced, and thus the crosslinked polyolefin resin film is used as a raw film constituting a stretch label. On the crosslinked polyolefin resin film, a printed pattern portion or the like is formed to produce a long label original film, and then the long label original film is formed in the horizontal direction or in the vertical direction. A label film that forms a stretch label by cutting with a slitter or the like in the direction is manufactured, and then the label film is overlapped at both ends, and the overlapped portion is bonded through an adhesive or the like. A cylindrical stretch label is manufactured by forming a joint portion. -When cut using-etc., the original film is excellent in cutability to cut in the vertical direction or horizontal direction using a slitter etc., and there is no trouble in workability at the time of label production, Its work efficiency can be remarkably improved, its productivity can be improved, and its cutting property is excellent, so that the cut surface of the end of the label can be finished beautifully, and a large amount of label Stretch, heat resistance, toughness, killing resistance, without impairing the production of non-defective products, etc., ultimately impairing its productivity, and without damaging the self-stretchability as a stretch label, It is excellent in printability and the like, and can produce an extremely beautiful stretch label that can be attached by tightly adhering to the outer peripheral surface of the bottle body using the self-stretchability of the film.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing an outline of a layer structure of a raw film constituting a stretch label according to the present invention.
FIG. 2 is a schematic configuration diagram showing a schematic configuration of a conventional stretch label manufacturing method.
FIG. 3 is a schematic configuration diagram showing an outline of the configuration of a conventional stretch label manufacturing method.
FIG. 4 is a schematic configuration diagram showing an outline of the configuration of a conventional stretch label manufacturing method.
FIG. 5 is a schematic configuration diagram showing an outline of the configuration of a conventional stretch label manufacturing method.
[Explanation of symbols]
1 Single or coextruded film of polyolefin resin
1a Crosslinked polyolefin resin film
2 Electron beam irradiation device
3 electron beam
A Original film that composes the stretch label

Claims (3)

In the cylindrical stretch label to be attached to the outer peripheral surface of the bottle body, overlapping both ends of the raw film, joining the overlapped part to form a joined part,
Ethylene polymerized using a metallocene catalyst (single site catalyst) extruded from a resin composition containing an ethylene-α-olefin copolymer polymerized using a single site catalyst. -Α-olefin copolymer film,
A resin composition containing an ethylene-α / olefin copolymer polymerized using a single-site catalyst, and a low-density polyethylene and an ethylene-α / olefin copolymer polymerized using a single-site catalyst A multilayer coextruded resin film coextruded using a resin composition and a resin composition comprising a low density polyethylene and an ethylene-α-olefin copolymer polymerized using a single-site catalyst,
Alternatively, a resin composition containing an ethylene-α / olefin copolymer polymerized using a single-site catalyst, a resin composition containing low-density polyethylene, and a polymer using a low-density polyethylene and a single-site catalyst. A multilayer co-extruded resin film co-extruded with a resin composition containing an ethylene-α / olefin copolymer,
Furthermore, the entire surface of the ethylene-α / olefin copolymer film or multilayer coextruded resin film polymerized using the metallocene catalyst (single site catalyst) was irradiated with an electron beam of 25 to 500 kGy for 1 second to 20 seconds. A stretch label comprising a cross-linked polyolefin resin film adjusted to a gel fraction of 5 to 85%. The ethylene-α / olefin copolymer polymerized using a metallocene catalyst (single site catalyst) has a density of 0.905 to 0.940 g / cm ³ and a melt flow rate (MFR) of 1.0 to 6.0 g. The stretch label according to claim 1 , which consists of / 10 minutes. The stretched label according to any one of claims 1 to 2, wherein the crosslinked polyolefin resin film has a thickness of 30 µm to 150 µm.

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