JP2002327149A - Coating agent composition for plastic label and plastic label coated with the coating agent composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating agent capable of imparting excellent slidability to a plastic label and a plastic label coated with the coating agent. SOLUTION: The coating agent composition for a plastic label is applied on the surface of the non-contacting side of a label stuck on the container, and it contains fluorine resin powder. The average particle size of the fluorine resin powder is 1-30 μm, and the ratio of the fluorine resin power to the whole of the solids in the coating agent is 1-20 wt.% Regarding the plastic label, the coating agent composition for a plastic label is applied on the non-contacting side of the plastic label stuck on the container. It is preferable that the friction coefficient of the outer surface of the coating agent layer side against the outer surface of a similar coating agent layer side of a plastic label is <=0.3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating composition for plastic labels capable of imparting excellent lubricity to plastic labels, and a coating composition which is coated with the coating composition and has excellent lubricity. Plastic label, and a plastic bottle to which the plastic label is attached.

[0002]

2. Description of the Related Art As plastic bottles such as PET bottles (bottles made of polyethylene terephthalate) for beverages such as soft drinks and coffee beverages, square bottles having a polygonal shape such as a substantially square cross section have recently been used. I have.
As shown in FIGS. 4 to 6, such a rectangular bottle has a neck, a shoulder, a side (body), a bottom, and the like. Usually, at least the side is covered with a shrink label. Have been done. In FIG. 4, 11 is a shrink label,
21 is a square plastic bottle (square bottle), 21a
Is a neck of the square bottle 21, 21b is a shoulder of the square bottle 21, 21c is a side of the square bottle 21, 21d is a bottom of the square bottle 21, and 31 is a cap. The shrink label 11 extends from the neck 21 a of the square bottle 21 to the bottom 21.
It is a full shrink label covering up to d.

In FIG. 5, 12 is a shrink label, 22 is a square plastic bottle (square bottle),
22a is the neck of the square bottle 22, 22b is the square bottle 2
Reference numeral 2 denotes a shoulder, 22c a side of the rectangular bottle 22, 22d a bottom of the rectangular bottle 22, and 32 a cap. The shrink label 12 is a semi-full shrink label that covers the rectangular bottle 22 from the shoulder 22b to the bottom 22d.

Furthermore, in FIG. 6, 13 is a shrink label, 23 is a square plastic bottle (square bottle), 23a is a neck of the square bottle 23, 23b is a shoulder of the square bottle 23, and 23c is a square bottle. Side of bottle 23, 23
d is the bottom of the rectangular bottle 23, and 33 is a cap. The shrink label 13 is provided on the shoulder 23 b of the square bottle 23.
Is a half shrink label that covers from the center portion of the side portion 23c to the vicinity of the center portion (that is, the upper side of the side surface of the square bottle 23).

[0005]

However, when a container such as a rectangular plastic bottle is loaded into a vending machine (bender), a consumer puts money into a predetermined place of the vendor and selects a product. However, there has been a problem that a container such as a rectangular plastic bottle may not slide out of an installation table in a vending machine, or may not pass through or drop through a predetermined passage, and may not come out of a product outlet.

Accordingly, an object of the present invention is to provide a coating composition for a plastic label capable of imparting an excellent slip property to a plastic label, and a coating composition which is coated with the coating composition and has an excellent slip property. In providing plastic labels. Another object of the present invention is to allow a plastic bottle with a plastic label to pass through or drop through a predetermined passage in a vending machine to be reliably loaded into a vending machine, and to pass through or pass through a predetermined passage in a vending machine. An object of the present invention is to provide a plastic bottle with a plastic label that can be dropped to reach a product takeout port without fail.

[0007]

Means for Solving the Problems The present inventors have conducted intensive studies to achieve the above object, and as a result, when a coating agent containing a fluororesin is applied to a plastic label, the plastic to which the coating agent has been applied is applied. The label has excellent slipperiness, and the container in which the plastic label is attached so as to cover the side surface of the main body, even if the container is loaded into the vending machine, surely slides out of the installation table in the vending machine, and the predetermined They have found that they can pass through or fall through a passage and come out of a product take-out opening, and have completed the present invention.

That is, the present invention relates to a coating composition applied to a non-contact side of a plastic label attached to a container with respect to the container, wherein the coating composition contains a fluororesin powder. To provide a coating composition for a plastic label.

[0009] In the coating composition of the present invention,
The average particle size of the fluororesin powder may be 1 to 30 μm, and the ratio of the fluororesin powder may be 0.5 to 30% by weight based on the total solid content in the coating agent.

[0010] The present invention also includes a plastic label in which the coating composition for a plastic label is applied to the surface of the plastic label container on the non-contact side. In this plastic label, the coefficient of friction of the outer surface on the coating agent layer side may be 0.3 or less with respect to the outer surface of the same plastic label on the coating agent layer side. As the plastic label of the present invention,
It is preferably a tubular label, and particularly preferably a shrink label for a square plastic bottle having a substantially square cross section.

Further, the present invention includes a plastic bottle with a plastic label, wherein the plastic label is mounted so as to cover a side surface of a main body of a rectangular plastic bottle having a substantially square cross section.

In the plastic bottle of the present invention, the perforations of the plastic label may be formed at the corners on the side of the rectangular plastic bottle. Further, the seal portion of the plastic label may be formed at a corner on the side of the square plastic bottle.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings as necessary. FIG. 1 is a schematic view showing an example of a plastic bottle 2 on which a plastic label 1 of the present invention is mounted. In FIG. 1, reference numeral 1 denotes a plastic label, and reference numeral 2 denotes a plastic bottle (hereinafter, may be simply referred to as “bottle”). 2a is the neck of the bottle 2, 2b is the shoulder of the bottle 2, 2c is the side (body) of the bottle 2, 2c1 is the sliding surface (plane) on the side 2c, and 2c2 is the corner on the side 2c. , 2d is the bottom of the bottle 2. 4 is a perforation formed on the plastic label 1, and 5 is a seal portion on the plastic label 1. 3 is a cap.

As shown in FIG. 1, the plastic bottle 2 is a square plastic bottle having a substantially square cross section (hereinafter, may be simply referred to as a “square bottle”). The plastic label 1 is a shrink label. The shrink label 1 is mounted so as to cover the entire side surface of the main body of the rectangular bottle 2 (that is, the entire surface of the side portion 2c), and is a full shrink label. Specifically, the square bottle 2 is covered by the shrink label 1 as a full shrink label from the neck 2a to the periphery of the bottom 2d through the shoulder 2b and the side 2c.

As shown in FIG. 2, the shrink label 1 includes a substrate 1a and a coating agent layer 1b laminated on the substrate 1a. In the shrink label 1, a surface (inner surface) 1a1 on the substrate 1a side
Is a surface on the contact side with the square bottle 2, and a surface (outer surface) 1 b 1 on the coating agent layer 1 b side is a surface on the non-contact side with the square bottle 2. Therefore, the coating agent layer 1b corresponds to an overcoat agent layer.

In the plastic label 1 as a shrink label, the friction coefficient of the outer surface 1b1 on the coating agent layer 1b side is 0.3 or less (for example, 0.1) with respect to the outer surface on the coating agent layer side of a similar shrink label. ~ 0.
3), and particularly preferably 0.1 to 0.2 when the plastic label is a full shrink label. That is, the friction coefficient between the outer surfaces between the plastic labels of the present invention is 0.3 or less. The coefficient of friction is 0.
If the number exceeds 3, the slipperiness of a plastic bottle with a plastic label (such as a square bottle) decreases, and the bottle such as the square bottle passes or falls through a predetermined passage when being loaded or removed from a vending machine. It becomes difficult.

For the same reason as described above, the plastic label 1 has a coefficient of friction of the outer surface 1b1 on the coating agent layer 1b side to a stainless steel plate of 0.45 or less (for example, 0.2 to 0.45). , Especially when the plastic label is a full shrink label
It is preferably 0.35.

In the present invention, the coefficient of friction of the outer surface 1b1 of the plastic label 1 may be a coefficient of static friction and / or a coefficient of dynamic friction. Coefficients of friction include static friction coefficient and dynamic friction coefficient (especially, static friction coefficient)
Is preferably adopted. That is, the coefficient of static friction and the coefficient of dynamic friction (particularly, the coefficient of static friction) with respect to the outer surface of the plastic label are preferably 0.3 or less.
Further, the coefficient of static friction and the coefficient of dynamic friction (particularly, the coefficient of static friction) with respect to the stainless steel plate are preferably 0.45 or less.

Incidentally, the static friction coefficient and the dynamic friction coefficient in the present invention can be measured in accordance with JIS K 7125. The friction coefficient (static friction coefficient, dynamic friction coefficient) is
Measurements taken on the outer surface of a stainless steel plate or similar plastic label (such as a shrink label) can be employed.

The coating agent layer 1b is formed by a coating agent. The coating agent comprises a coating agent composition containing a fluororesin powder.
Specifically, the coating agent comprises a coating agent composition containing a base resin and a fluororesin powder. The coating agents can be used alone or in combination of two or more.

In the coating composition of the present invention,
The fluororesin in the fluororesin powder is not particularly limited, and a resin containing at least a fluorine atom-containing monomer as a monomer component can be used. That is, the fluororesin may be a polymer containing only a fluorine atom-containing monomer, and a fluorine atom-containing monomer,
A copolymer of the fluorine atom-containing monomer and a copolymerizable monomer capable of copolymerization may be used.

As the fluorine atom-containing monomer, a fluorine atom-containing vinyl monomer can be suitably used. As the fluorine atom-containing vinyl monomer, for example, tetrafluoroethylene, trifluoroethylene,
Fluorinated ethylene such as chlorotrifluoroethylene, 1,1-difluoroethylene (vinylidene fluoride), 1,2-difluoroethylene, monofluoroethylene (vinyl fluoride); propylene fluoride such as hexafluoropropylene; hexafluoroisobutylene And the like; perfluoro (methyl vinyl ether), perfluoro (ethyl vinyl ether), perfluoro (alkyl vinyl ether) such as perfluoro (propyl vinyl ether), and the like. The fluorine atom-containing monomers can be used alone or in combination of two or more.

Further, as the copolymerizable monomer, for example,
In addition to olefin monomers such as ethylene and propylene,
Diene monomers such as butadiene; methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate;
N-butyl (meth) acrylate, isobutyl (meth) acrylate, s-butyl (meth) acrylate, t-butyl (meth) acrylate, hexyl (meth) acrylate,
Octyl (meth) acrylate, 2- (meth) acrylate
Ethylhexyl, decyl (meth) acrylate, (meth)
Alkyl (meth) acrylates such as dodecyl acrylate, tetradecyl (meth) acrylate, hexadecyl (meth) acrylate, octadecyl (meth) acrylate,
Acrylic monomers such as cycloalkyl (meth) acrylates such as cyclohexyl (meth) acrylate and aryl (meth) acrylates such as phenyl (meth) acrylate;
Vinyl monomers containing chlorine atoms such as vinyl chloride and vinylidene chloride; vinyl acetate, vinyl propionate, vinyl butyrate,
Vinyl esters such as vinyl caproate; vinyl ethers such as methyl vinyl ether and ethyl vinyl ether; and styrene monomers such as styrene, vinyl toluene and α-methyl styrene. The copolymerizable monomers can be used alone or in combination of two or more.

As the copolymerizable monomer, a vinyl monomer having a carboxyl group such as acrylic acid, methacrylic acid, itaconic acid, crotonic acid and maleic anhydride; (meth)
Alkoxyalkyl (meth) acrylates such as methoxymethyl acrylate and 2-methoxyethyl (meth) acrylate; dialkylaminoalkyl (meth) acrylates such as dimethylaminoethyl (meth) acrylate; glycidyl (meth) acrylate and the like Glycidyl group-containing vinyl monomers; amide group-containing vinyl monomers such as N-methylol (meth) acrylamide; hydroxymethyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate,
3-hydroxypropyl (meth) acrylate, (meth)
Hydroxyalkyl (meth) acrylates such as 2-hydroxypropyl acrylate and 4-hydroxybutyl (meth) acrylate; vinyl alcohol; allyl alcohol;
Hydroxyalkyl vinyl ethers such as 2-hydroxyethyl vinyl ether and 3-hydroxypropyl vinyl ether; hydroxyalkyl allyl ethers such as 2-hydroxyethyl allyl ether; and copolymerizable monomers having a functional group such as methylolated (meth) acrylamide. It may be used.

More specifically, examples of the fluororesin include polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene (PCTFE), polyvinylidene fluoride (PVDF), polyvinyl fluoride (PVF), and tetrafluoroethylene. Ethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene-perfluoroalkylvinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene-perfluoroalkylvinyl ether copolymer (EPE), tetrafluoroethylene- Ethylene copolymer (ETFE), chlorotrifluoroethylene-ethylene copolymer (ECTFE) and the like are included.

In the present invention, as the fluororesin, polytetrafluoroethylene or tetrafluoroethylene and another fluorine atom-containing monomer (such as hexafluoropropylene or perfluoroalkyl vinyl ether) and / or a copolymerizable monomer A copolymer (tetrafluoroethylene-based copolymer) with a copolymer (such as ethylene) can be suitably used. The fluororesins can be used alone or in combination of two or more.

In the present invention, it is important that the fluororesin has a powdery (or pulverized) form. In the fluororesin powder, the form of the powder is not particularly limited, and may be, for example, a fixed shape (substantially spherical, approximately square, approximately flat, approximately needle-like, etc.), and the cross section is not constant The shape may be irregular. Further, it may have isotropic or anisotropic properties. Further, the cross-section of the fluororesin powder may be generally rounded (substantially circular), angular (substantially square), saw-toothed or jagged, and more sharp (pointed). And the like. For example, as a fluororesin powder, a powder having an irregular shape having a cross section that is not constant and has a pointed portion, a concave portion, a convex portion, a thread portion, a fibrous portion, a spherical portion, a flat portion, a hole portion, and the like. Can be used. In addition, the fluororesin powder having a fibrous shape (fiber shape) can exert an anchor effect.

The average particle size of the fluororesin powder is not particularly limited, but when the coating agent is applied by gravure printing, the average particle size of the fluororesin powder is preferably 30 μm or less. Specifically, the average particle diameter of the fluororesin powder is, for example, 1 to 30 μm
(Preferably 3 to 25 μm, more preferably 5 to 20 μm
μm). If the average particle diameter of the fluororesin powder is less than 1 μm, it may not contribute to the improvement of the slipperiness. The average particle size is 3
When a fluororesin powder having a thickness of 0 μm or more is used, another coating method may be employed.

In the coating composition, a base resin can be used. The base resin is not particularly limited, for example, polyester, polyvinyl chloride,
Polyvinyl acetate, cellulose resin, acrylic resin,
A thermoplastic resin such as a urethane-based resin can be used. The base resin can be used alone or in combination of two or more.

The coating composition of the present invention can be composed of a base resin, a fluororesin powder, and if necessary, additives. Examples of such additives include
For example, other lubricants (lubricant other than fluororesin powder), anti-settling agents (amide-based anti-settling agents, etc.), dispersion stabilizers (surfactants, etc.), matting agents, extenders and various colorants, fillers, Examples thereof include additives such as an antioxidant, an ultraviolet absorber, and an antistatic agent, and organic solvents.

As described above, the coating composition may contain a lubricant (for example, a particulate solid substance composed of components other than fluororesin, wax, silicone oil, etc.) as described above. However, since the fluororesin powder is used, excellent slipperiness can be imparted to the plastic label without using another lubricant. In particular, when a component (silicone oil or the like) that is liquid at normal temperature (about 23 ° C.) is used as a lubricant, the base resin used is swollen, the strength of the coating film by the coating agent is reduced, and the anti-blocking property is also improved. The use of a liquid component as a lubricant is not preferred because the properties may also be reduced.

The particulate solid material as a lubricant includes silica, talc, mica, kaolin, bentonite, clay, graphite, graphite fluoride, carbon black, titanium oxide, zinc oxide, magnesium oxide, boron nitride, molybdenum disulfide. , Tungsten disulfide, calcium carbonate, calcium sulfate, calcium titanate, calcium phosphate, calcium hydroxide, aluminum hydroxide, magnesium hydroxide, glass powder, alumina, metal powder and other inorganic particles; higher alcohols such as stearyl alcohol, stearic acid Such as higher fatty acids, higher fatty acid esters such as butyl stearate, partial esters of fatty acids and polyhydric alcohols such as glycerin fatty acid esters, stearic acid amides,
Higher fatty acid amides such as ethylenebisstearylamide,
Salts of higher fatty acids (metal soap) such as barium stearate, calcium stearate, zinc stearate, aluminum stearate, magnesium stearate, etc., polyacetals, metal salts of poly (meth) acrylate, polyacrylonitrile, polyacrylamide, melamine series Organic particles such as resin, phenolic resin, starch powder, and cellulose powder are included. In addition, mineral waxes such as microcrystalline wax, oxidized microcrystalline wax, paraffin, paraffin oxide, and montan wax; polyethylene wax, polypropylene wax, polyethylene oxide wax, oxidized polypropylene wax, chlorinated polyethylene wax, and chlorinated polypropylene. Wax, ethylene-acrylic acid copolymer wax, ethylene-vinyl acetate copolymer wax, synthetic wax such as polycarbonate wax; lacquer wax, beeswax, white wax, wood wax, spermaceti, petrolatum,
Lanolin, carnauba wax, cane wax, candelilla wax, shellac wax, rice wax,
Natural wax such as sugar wax is included.
Lubricants can be used alone or in combination of two or more.

In the coating composition, as the organic solvent, organic solvents having low toxicity, for example, acetates such as ethyl acetate and n-propyl acetate, and alcohols such as methanol, ethanol and isopropyl alcohol are preferable. Can be used. As the organic solvent, it is not necessary to use highly toxic organic solvents, for example, ketones such as methyl ethyl ketone and aromatic hydrocarbons such as toluene. The organic solvent can be removed by drying after applying the coating agent to the substrate.

In the present invention, the coating agent composition has a coefficient of friction (dynamic friction coefficient and / or static friction coefficient) of 0.1 to the base resin and the same outer surface as the plastic label of the present invention (the outer surface between the plastic labels). 3 or less,
And / or a fluororesin powder having a friction coefficient (dynamic friction coefficient and / or static friction coefficient) with respect to the stainless steel plate of 0.45 or less. As the coating agent composition, the content of the fluororesin powder is such that the dynamic friction coefficient of the outer surface between the plastic labels is 0.3 or less and the static friction coefficient of the outer surface between the plastic labels is 0.3 or less. Preferably, it is an amount. Further, as a coating agent composition,
It is preferable that the content of the fluororesin powder is such that the dynamic friction coefficient with respect to the stainless steel plate is 0.45 or less and the static friction coefficient with respect to the stainless steel plate is 0.45 or less. Specifically, the content of the fluororesin powder is, for example, 0.5 to 30% by weight, preferably 1 to 25% by weight, based on the total solid content in the coating composition.
More preferably, it is about 2 to 20% by weight. If the content of the fluororesin powder is too small, the slipperiness of the plastic bottle with a plastic label is reduced. On the other hand, if it is too large, the adhesion of the coating agent layer to the base material may be reduced, or the attachment of the plastic label to the plastic bottle may be deteriorated.
It is disadvantageous in terms of cost.

The thickness of the coating agent layer 1b is not particularly limited, and is, for example, 0.5 to 5 μm, preferably 1 to 3 μm.
It can be selected from a range of about m.

The base material 1a of the plastic label 1
Can be formed of a plastic film. As a material of the plastic film, a thermoplastic resin such as polyester, styrene-based resin, polyolefin (eg, polyethylene, polypropylene), and polyvinyl chloride is preferably used. The plastic film material can be used alone or in combination of two or more.

In the substrate 1a, polyester,
Since a styrene-based resin or the like has low lubricity, a plastic label 1 that can exhibit excellent lubricity can be obtained by laminating the coating agent layer 1b.

The polyester of the substrate 1a includes various polyesters composed of a dicarboxylic acid component and a diol component. When a heat-shrinkable polyester film is used as the base material 1a, terephthalic acid and ethylene glycol are used as main components of a dicarboxylic acid component and a diol component, respectively, and as a copolymer component, isophthalic acid, phthalic acid, and adipic acid are used. Copolymer polyesters using a diol component such as dicarboxylic acid such as sebacic acid and naphthalenedicarboxylic acid, diethylene glycol, neopentyl glycol, polyalkylene glycol, and 1,4-cyclohexanedimethanol are preferably used.

When a styrene-based heat-shrinkable film is used as the substrate 1a, it is preferable to use a styrene-butadiene copolymer as a main component.

The substrate 1a of the present invention may be composed of a single-layer film or a multilayer film. The thickness of the substrate 1a is not particularly limited, and may be selected, for example, from a range of about 20 to 80 μm, preferably about 30 to 60 μm.

The plastic label (especially shrink label) of the present invention is formed by a known method such as an extrusion method or a calendering method, and then, if necessary, is subjected to a stretching treatment to form a coating agent layer on the surface of the obtained film. It can be manufactured by laminating by a coating method such as printing (for example, gravure printing). Note that the coating agent layer is preferably transparent.

The stretching can be performed by any of a tenter method and a tube method. The stretching treatment is performed, for example, at an appropriate temperature in consideration of the glass transition temperature and the like of the polyester constituting the film, by 1.5 to 8 times in the direction corresponding to the circumferential direction of the container (normally, the width direction (TD direction)). Preferably, the stretching is performed about 4 to 5 times. Note that, if necessary, a stretching process can also be performed at a low stretching ratio (for example, about 1.5 times or less) in a direction perpendicular to the above-mentioned direction (usually, the length direction (MD direction)). After stretching, usually, a heating zone of about 60 to 90 ° C. is applied for about 1 to 10
A heat set to pass for 2 seconds is performed. The film thus obtained has an orientation in the main stretching direction and shows a large heat shrinkage in the direction, and can be suitably used as a heat shrinkable film for shrink labels.

The plastic label 1 can be printed with characters and designs. The surface on which characters, designs, and the like are printed is usually the surface (inner surface) 1a1 of the plastic label 1 on the contact side with the bottle 2.

The plastic label 1 of the present invention is obtained by applying a coating agent to a base material, printing characters and designs as necessary, and cutting it into a long strip having a desired width.
After the coating agent layer is turned outside (the printed surface of the character or design is turned inside), the main stretching direction is rounded into a cylindrical shape so that the circumferential direction is the circumferential direction, and both ends are bonded with an adhesive or the like (center seal). If necessary, it is cut to a desired length and used as a cylindrical plastic label (particularly, a shrink label).

The form of the plastic label (especially a shrink label) of the present invention is not particularly limited as long as it covers at least the side of a plastic bottle (especially a rectangular plastic bottle). 1
Alternatively, it may have the form of a full shrink label as shown in FIG. 4, or may have the form of a semi-shrink label as shown in FIG. Further, it may have a form of a so-called half shrink label that covers an upper portion of the side surface of a rectangular plastic bottle as shown in FIG.

In the present invention, the plastic label (especially a shrink label) covers at least substantially the entire side of the plastic bottle (especially a square plastic bottle) (ie, covers at least from the shoulder to the bottom). Preferably, it has the form of a full shrink label or a semi full shrink label.

In the plastic label of the present invention, when the plastic label is a shrink label, the heat shrinkage of the shrink label is not particularly limited. For example, as a heat shrinkage, when treated at 90 ° C. for 10 seconds,
40 in one direction X (direction corresponding to the circumferential direction of the container)
８０80%, preferably 50-75%. If the heat shrinkage is less than 40%, the shrinkage may be insufficient. On the other hand, if the heat shrinkage exceeds 80%, the label is undesirably distorted.

For example, when the material constituting the shrink label is polyester, the types of the dicarboxylic acid component and the diol component and their composition ratios (particularly, the ratio of the aliphatic dicarboxylic acid component), the stretching conditions ( Stretching temperature, stretching ratio, etc.), heat setting conditions (temperature, time, etc.)
It can be adjusted within the above range by appropriately selecting the above.

As shown in FIG. 1, a rectangular plastic bottle 2 having a sliding surface (flat portion) 2c1 on the side (body) 2c can be suitably used as the bottle. As shown in FIG. 3, a typical example of the square bottle 2 is a square plastic bottle having a substantially square cross section. FIG. 3 is a schematic cross-sectional view of the body 2c of the square bottle 2. The body 2c has four sliding surfaces 2c.
Although it is composed of one and four corners 2c2, it has a substantially square cross section as a whole.

In the present invention, a blow-molded bottle made of polyester such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene terephthalate (PBT) can be used as the bottle (especially a square bottle). . Side (body) 2c
The shape of the sliding surface portion (flat portion) 2c1 is not particularly limited, but is usually a shape that can absorb the reduced pressure and suppress the deformation of the bottle. For example, a slightly raised convex portion in the center portion In many cases, it has a substantially square concave shape and is substantially flat as a whole sliding surface portion.

In the plastic bottle 2 with a plastic label of the present invention, for example, a shrink label as the plastic label 1 of the present invention formed in a cylindrical shape is supplied to an automatic label mounting apparatus and cut into a required length. ,
To be manufactured by continuously fitting a plastic bottle (especially a square plastic bottle) filled with contents so as to cover substantially the entire side surface of the bottle body or a predetermined portion, and then heat shrinking by heating to mount the bottle. Can be. The heat shrinkage of the shrink label fitted on the square bottle may be performed by any known method, however, for example, 80 to
It is preferable to perform heat shrinkage by passing through a steam tunnel at about 100 ° C.

The plastic bottle with a plastic label of the present invention (especially a rectangular plastic bottle with a shrink label) is loaded into a vending machine, and comes out of the loaded portion (installation table) to a product outlet. In this case, it is necessary that the plastic bottle can be smoothly put into the vending machine and that the plastic bottle starts to slide from the loaded portion. The plastic bottle with a plastic label of the present invention has a low coefficient of friction on the outer surface of a plastic label (especially a shrink label) that covers substantially the entire side surface of the main body of the bottle (especially a square bottle). Therefore, the rectangular plastic bottle with a plastic label, in which the beverage is filled in the bottle, especially the rectangular bottle, can easily start to slide even if the angle of the installation table is small. For example, in a vending machine, the angle of the installation base of the rectangular bottle is usually about 15 °. In the square plastic bottle with a plastic label of the present invention, when a predetermined beverage is filled in the square bottle, the static friction coefficient between outer surfaces between similar plastic labels is 0.3 or less (and / or the static friction against a stainless steel plate). The coefficient is 0.
(45 or less), the vending machine can easily slide out of the installation table and pass or fall through a predetermined passage. Similarly, the plastic bottle can be smoothly put into the vending machine.

Further, when the product comes out of the installation stand in the vending machine to the product take-out port, it slides out of the installation stand in the vending machine and then passes or falls through a predetermined passage. At this time, the sliding surface portion 2c1 of the side portion 2c of the rectangular bottle 2 (that is, the surface portion where the rectangular bottles come into contact with each other when a plurality of rectangular bottles are loaded into the vending machine) contacts the wall of the passage. According to the present invention, the square plastic bottle with a plastic label (square bottle 2) is covered with the plastic label of the present invention on the entire side surface (sliding surface portion 2c1) of the bottle body. Is 0.3 or less (and / or the dynamic friction coefficient with respect to a stainless steel plate is 0.45 or less),
After the square bottle 2 easily slides out of the installation table, even if the sliding surface 2c1 comes into contact with the wall of the passage passing therethrough, the square bottle 2 does not stop in the passage due to friction between the two, and the product is reliably provided. Comes out of the outlet. In particular, in a vending machine, the rectangular bottles 2 are continuously loaded, and the bottles 2 are in contact with each other on their side surfaces. It is important that the dynamic friction coefficient between the outer surfaces between the plastic labels be 0.3 or less (preferably 0.2 or less) in order to improve the slipperiness between the outer surfaces between them.

As described above, the plastic bottle with the plastic label of the present invention has the static friction coefficient and the kinetic friction coefficient of 0.3 or less between the outer surfaces between the plastic labels (and / or the static friction coefficient and the kinetic friction with the stainless steel plate). When both of the coefficients are 0.45 or less), even when loaded into a normal or conventional vending machine, they can be sequentially loaded without clogging at the time of loading, and can easily slide out of the installation table, and Or drop through the passage, and reach the product take-out port.

When the plastic label is a half-shrink label, the outer surface of the label is too slippery than the outer surface of the bottle to which no label is attached.
Since the slip may not be uniform in the vending machine, the coefficient of friction with the same outer surface as the label is in the range of 0.2 to 0.3 (and / or the coefficient of friction with the stainless steel plate is 0.3 to 0.45). Within the range).

In the plastic bottle with a plastic label of the present invention, as shown in FIG. 1, shrink labels and the like are used at the consumer stage for recycling of bottles such as rectangular bottles (for example, recycling of PET resin). To make it easy to peel the plastic label from the bottle,
Perforations 4 for cutting can be provided in the longitudinal direction. FIG.
When the bottle is a square-shaped bottle as shown in FIG.
Is preferably formed in the vertical direction at the position. As described above, when the perforations 4 are formed in the vertical direction at the corners 2c2 of the side portions 2c, the perforations 4 are not present on the sliding surface 2c1 of the rectangular bottle 2, which affects the slipperiness in the vending machine. Bottle 2 in a vending machine
Does not reduce the slipperiness of

In the plastic bottle with a plastic label according to the present invention, as shown in FIG. 1, when the shrink label as the plastic label is formed into a cylindrical shape, the sealing portion 5 having both ends adhered with an adhesive or the like.
(Center seal portion) is provided, but the seal portion 5 of the shrink label 1 is
2 is preferably formed in the vertical direction. As described above, when the seal portion 5 is formed in the vertical direction including the corner portion 2c2 of the side portion 2c, the seal portion 5 becomes
Does not affect the slippage of the rectangular bottle 2 in the vending machine.

The perforation 4 and the seal portion 5 may be provided at the same corner or at different corners. It is preferable that the perforations 4 and the seal portion 5 are provided at different corners.

Since the fluororesin powder has a larger particle diameter with respect to the thickness of the coating agent layer than other lubricants, the effect of improving the slipperiness by the fluororesin cannot be generally obtained without baking. The coating agent of (especially shrink labels) is practically hardly contained, and is usually used as a single film of a fluororesin. However, in the present invention, even if a fluororesin powder having a relatively large particle size as compared with other lubricants is used as a lubricant contained in the coating agent, the coating agent layer is formed by a normal application method without baking or the like. The slip property can be greatly improved only by forming. In particular, in the present invention, it has been found that, even if the average particle diameter of the fluororesin powder is larger than the thickness of the base resin in the coating agent layer, it can be improved by increasing the slipperiness. That is, in the present invention, as the fluororesin powder, a fluororesin powder having an average particle diameter larger than the thickness of the base resin in the coating agent layer can be suitably used.

Moreover, the plastic label of the present invention
Because it has a coating agent layer with a coating agent containing fluororesin powder,
The strength of the coating film of the coating agent layer is excellent. That is, the plastic label of the present invention has excellent scratch resistance or abrasion resistance. Therefore, even if the outer surface (the surface of the coating agent layer) of the plastic label of the present invention is rubbed by contacting the plastic labels (especially shrink labels) or the machine used, the surface of the coating agent layer is also affected by the rubbing. Is prevented from being generated, and for example, debris (powder or the like) due to damage to the surface due to abrasion does not occur.

For example, when a plastic label (especially a shrink label) is center-sealed and rolled, the outer surface (the surface of the coating agent layer) of the plastic label is rubbed in contact with a machine or the like used for center-sealing. The surface of the coating agent layer is not damaged by the rubbing. When a shrink label as a plastic label is attached to a plastic bottle by heat shrinkage, the outer surface (the surface of the coating agent layer) of the shrink label is rubbed in contact with a machine or the like. No damage occurs on the layer surface. Furthermore, when a plastic bottle with a plastic label with a plastic label is placed in a storage or transport container such as cardboard for storage or transport, or a plastic bottle placed in a transport container is transported. In some cases, the surface of the coating agent layer of the plastic label is rubbed in contact with the surface of the coating agent layer of another plastic label or the inner wall of the container, and the rubbing may damage the surface of the coating agent layer. Absent. Therefore, the strength and scratch resistance of the coating film surface due to the coating agent are excellent, and when the plastic label is prepared, stored or transported, and when the plastic label is mounted on the plastic bottle or stored or transported after mounting. Rubbing by contact with other plastic labels or parts of the machine used causes little or no damage and does not cause debris (eg, powder embossing) due to damage .

Further, the plastic label of the present invention
Even if the labels are wound up and stored one on top of the other, blocking does not occur for a long period of time, and the blocking resistance is good.

On the other hand, when only a wax such as polyethylene wax is used as the lubricant, the sliding property of the surface of the coating layer of the plastic label is low. Therefore, when a plastic label coated with a coating agent containing a wax such as polyethylene wax as a lubricant was mounted on a square plastic bottle, the plastic label-equipped square plastic bottle was loaded into a vending machine and sold. In some cases, slippage from the installation table in the vending machine is poor, and the vehicle may pass or fall through a predetermined passage and do not come out of the product outlet. So, as a lubricant,
When a combination of wax and silicone oil is used, the silicone oil is in a liquid state at normal temperature (about 23 ° C.), so that the base resin used is swollen, and the strength of the coating film by the coating agent is reduced. The blocking resistance also decreases.

Further, in the present invention, although expensive fluororesin powder is used, even a small amount of the powder can exhibit excellent slipperiness. Can be reduced.

As described above, the plastic label of the present invention not only has excellent slipperiness, but also has good strength of the coating film on the surface of the coating agent layer. Moreover, the cost is also high. Therefore, the plastic label of the present invention is useful as a shrink label for a plastic bottle to be loaded into a vending machine, especially a square plastic bottle. In addition, the cylindrical plastic label of the present invention may be a stretch label that is tightly attached to a container by self-stretching, mainly composed of a polyethylene film or the like, in addition to the shrink label.

[0066]

According to the plastic label of the present invention,
Plastic bottles, especially square-shaped plastic bottles can be given excellent slipperiness, for example,
Even if the rectangular plastic bottle with a plastic label of the present invention is loaded into a vending machine, the rectangular plastic bottle can be surely protruded to the product take-out port without being boring in the vending machine.

Further, since the plastic bottle with a plastic label of the present invention has good slipperiness, even if the plastic bottles come into contact with each other on a transfer line (conveyor) in a beverage filling factory for tea, coffee, etc. It can be transported smoothly.

[0068]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

(Example 1) Fluororesin powder (Aflon PTFE L169J, trade name, manufactured by Asahi Glass Fluoropolymers Co., Ltd., average particle diameter: 13 μm)]: 1 part by weight, 45% by weight of an acrylic resin in isopropyl alcohol solution (commercially available) Name “Dianal LR-943” manufactured by Mitsubishi Rayon Co., Ltd.): 60 parts by weight (solid content: 27 parts by weight), anti-settling agent (amide type anti-settling agent): 0.3 part by weight, dispersion stabilizer (phosphorus) An acid ester-based surfactant): 0.2 parts by weight, ethyl acetate: 12 parts by weight, and isopropyl alcohol: 22.5 parts by weight are mixed to form a coating agent (hereinafter, referred to as “coating agent A”). Prepared.
Polyester film (manufactured by Toyobo Co., trade name "S75
61 ", a film thickness of 50 μm) is coated with the coating agent A by gravure printing so that the average thickness after drying is 3 μm to form a coating agent layer, and gravure printing is performed on the other surface. To form a printing layer (ink layer) to prepare a shrink label having a coating agent layer (referred to as "shrink label A"). The shrink label A was rolled into a cylindrical shape so that the width direction of the base film became the circumferential direction, and both ends were welded by heat to obtain a long continuous shrink label. This continuous shrink label body is supplied to an automatic label mounting apparatus, cut into each label, and then filled with tea. The bottle has a substantially square cross section and a 500 ml inner volume made of polyethylene terephthalate (PET bottle). Was formed so that a perforation of the label was formed, and then heat-shrinked by passing through a steam tunnel (at a temperature of 90 ° C.) to produce a rectangular plastic bottle with a shrink label as shown in FIG.

(Example 2) Fluororesin powder (trade name “AFLON PTFE L173J” manufactured by Asahi Glass Fluoropolymers Co., Ltd., average particle size: 7 μm)]: 1 part by weight, polyester (trade name “Byron 240” Toyobo Co., Ltd.) )
): 15 parts by weight, anti-settling agent (amide-based anti-settling agent): 0.3 part by weight, dispersion stabilizer (phosphate ester-based surfactant): 0.2 part by weight, ethyl acetate: 40 parts by weight,
N-propyl acetate: mixed at a ratio of 43.5 parts by weight,
A coating agent (hereinafter, referred to as “coating agent B”) was prepared. On one surface of a polyester-based film (manufactured by Toyobo Co., Ltd., trade name “S7561”, film thickness: 50 μm), the coating agent B is applied by gravure printing so that the average thickness after drying is 3 μm. Was formed, and ink was applied to the other surface by gravure printing to form a printing layer (ink layer), thereby preparing a shrink label having a coating agent layer (referred to as "shrink label B"). The shrink label B is made of PET by the same method as in the first embodiment.
A rectangular plastic bottle with a shrink label as shown in FIG. 1 was prepared by being mounted on the bottle.

Comparative Example 1 Polyethylene wax (trade name "X-5159" manufactured by Gifu Shellac Co., Ltd.) and silicone oil (trade name "SH-83PA" manufactured by Toray Dow Corning Silicone Co., Ltd.): 5 parts by weight ( Total amount of both),
Acrylic resin 40% by weight isopropyl alcohol solution (trade name "KK Polymer OH-234S" manufactured by Shin-Nakamura Chemical Co., Ltd.): 60 parts by weight (solid content: 24 parts by weight), anti-settling agent (amide-based anti-settling agent) ): 0.3 parts by weight, a dispersion stabilizer (phosphate ester-based surfactant): 0.2 parts by weight, ethyl acetate: 34.5 parts by weight, and a coating agent (hereinafter referred to as “coating agent”). C ")
Was prepared. On one surface of a polyester-based film (manufactured by Toyobo Co., Ltd., trade name “S7561”, film thickness: 50 μm), the coating agent C is dried to a thickness of 0.
A coating layer is formed by applying by gravure printing so as to have a thickness of 5 to 3 μm, and an ink is applied by gravure printing to the other surface to form a printing layer (ink layer).
A shrink label having a coating agent layer (referred to as "shrink label C") was prepared. The shrink label C was attached to a PET bottle in the same manner as in Example 1 to produce a rectangular plastic bottle with a shrink label as shown in FIG.

[Coefficient of friction (coefficient of friction between outer surfaces)] Coffee-containing P thus provided with a shrink label
With respect to the ET bottle, the coefficient of friction of the outer surface of the shrink label on the side of the overcoat agent layer (the coefficient of friction between the outer surfaces) was measured by the following method to evaluate the slipperiness, and the measurement results are shown in Table 1. -Method of measuring coefficient of friction With respect to a shrink label as a plastic label, the outer surfaces (surfaces of the coating agent layer) of the shrink label are overlapped with each other and allowed to stand for 10 seconds in accordance with JIS K 7125, and then the sliding speed is 500 mm / min. And the coefficient of static friction and the coefficient of dynamic friction were measured. Note that, as the measurement conditions, two opposing conditions are adopted: a condition in which the outer surfaces of the shrink labels to be superimposed are both dry (dry) and a condition in which the outer surfaces are wet (condensed). Specifically, in the measurement under the wet condition, 0.1 cc of water is dropped on the outer surface of one of the shrink labels (the one to be fixed), and the other (the one to be slid) of the shrink label is shrunk. The measurement is performed with the outer surfaces overlapped

[Transparency] The transparency of the coating agent layer of the shrink label was evaluated using a direct-reading haze meter manufactured by Toyo Seiki Seisaku-sho, Ltd. according to the following evaluation criteria. -Evaluation criteria A: The measured value is 3% or less (printed characters or patterns on the printed layer can be recognized very clearly.
That is, the transparency of the coating agent layer is extremely excellent. ○: The measured value is more than 3% and not more than 5% (printed characters or patterns in the printed layer can be clearly recognized. That is, the transparency of the coating agent layer is excellent.) Δ: The measured value is more than 5% and not more than 10% (the printed characters or patterns in the printed layer are obscure but visible, that is, the coating agent layer is in a translucent state) ×): The measured value exceeds 10% (the printed characters or patterns in the printed layer cannot be visually recognized. That is, the coating agent layer is opaque.)

[Abrasion Resistance] Further, the outer surfaces of the same shrink label were rubbed 100 times, and the strength of the coating agent layer was examined to evaluate the abrasion resistance. The evaluation results are also shown in Table 1.

[Slidability in Vending Machine (Mounting Evaluation)]
Furthermore, a vending machine manufactured by Sanyo Electric Co., Ltd., which is actually sold, has a shrink label attached tea
When an ET bottle was loaded and it was checked whether or not the 1,000 bottles came out of the product outlet (mounting evaluation), the square plastic bottles with shrink labels according to Examples 1 and 2 and Comparative Example 1 were , All 1,000 came out of the product outlet.

[0076]

[Table 1]

As shown in Table 1, the PET bottle containing tea to which the shrink label according to the example was attached had a small coefficient of friction in both the static coefficient of friction and the dynamic coefficient of friction. Therefore, the PET bottle containing tea to which the shrink label according to the example is attached has good slipperiness.

Further, the PET bottle with tea provided with the shrink label according to the embodiment has a good mounting evaluation, and even if it is actually loaded into a vending machine, it comes out surely or almost to the product outlet. It was confirmed that.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an example of a plastic bottle with a plastic label of the present invention.

FIG. 2 is a schematic sectional view showing the plastic label shown in FIG.

FIG. 3 is a schematic sectional view showing the plastic bottle shown in FIG.

FIG. 4 is a schematic view showing an example of a square plastic bottle with a shrink label according to a full shrink label.

FIG. 5 is a schematic view showing an example of a square plastic bottle with a shrink label according to a semi-full shrink label.

FIG. 6 is a schematic view showing an example of a square plastic bottle with a shrink label according to a half shrink label.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plastic label 2 Plastic bottle 2a Neck 2b Shoulder 2c Side (body) 2c1 Sliding surface (plane) 2c2 Corner 2d Bottom 3 Cap 4 Perforation 5 Seal 1a Base 1b Coating agent layer 1a1 Inner surface 1b1 Outer surface

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) G09F 3/04 G09F 3/04 C (72) Inventor Yoshinobu Kitamori 1300-3 Yachimanjiguchi Irino, Nabari-shi, Mie Prefecture Fuji Seal Co., Ltd. F-term in the Nabari factory (reference)

Claims (9)

[Claims] 1. A coating composition applied to a surface of a non-contact side of a plastic label to be mounted on the container, wherein the coating composition contains a fluororesin powder. Coating composition. 2. The fluororesin powder has an average particle size of 1 to 30.
The coating composition for a plastic label according to claim 1, wherein the composition is 0.5 µm and the proportion of the fluororesin powder is 0.5 to 30% by weight based on the total solid content in the coating composition. 3. A plastic label, wherein the plastic label coating composition according to claim 1 or 2 is applied to a surface of the plastic label container on a non-contact side. 4. The plastic label according to claim 3, wherein the coefficient of friction of the outer surface on the coating agent layer side is 0.3 or less with respect to the outer surface of the same plastic label on the coating agent layer side. 5. The plastic label according to claim 3, which is a cylindrical label. 6. The plastic label according to claim 3, which is a shrink label for a square plastic bottle having a substantially square cross section. 7. The plastic label according to claim 3, wherein the plastic label is attached so as to cover a side surface of a main body of a rectangular plastic bottle having a substantially square cross section. Plastic bottle. 8. The plastic bottle with a plastic label according to claim 7, wherein a perforation of the plastic label is formed at a corner on a side of the rectangular plastic bottle. 9. The plastic bottle with a plastic label according to claim 7, wherein the seal portion of the plastic label is formed at a corner on the side of the rectangular plastic bottle.