JP2003177673A - Recyclable label - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a label which is pasted to an article, such as a container, requiring recycling and disposing, exhibits easy peelability and manual peelability and can be easily peeled from the article, such as the container, by immersing the label into warm water, hot water or alkaline warm water and alkaline hot water, and prevents a tacky adhesive from eluting from the rear surface end of the label even if the label is immersed into ordinary or hot water, etc. <P>SOLUTION: The entire surface of the rear surface of the label base material 1 of specific gravity below 1 is provided with a pressure sensitive tacky adhesive layer 2 which is peeled by being degraded in the strength of tacky adhesion by the warm water, the hot water, the alkaline warm water or the alkaline hot water and the top of the tacky adhesive layer 2 at the ends of the label base material 1 or in portions at these ends is provided with a non-tacky adhesive layer 3. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various recyclable containers such as plastic bottle containers and a recyclable label that is used by being attached to various recyclable articles.

[0002]

2. Description of the Related Art Generally, various recyclable containers, such as plastic bottle containers and glass containers, and various recyclable articles, are labeled with hot water using a label attached to the article. Resources are collected by recycling by peeling from the container by washing with water and separating and collecting.

As described above, since the label is peeled off by washing with hot water, a hot water-soluble adhesive is used as an adhesive which is applied to the back surface of the label and used to impart good hydrophilicity. An acrylic water-soluble pressure-sensitive adhesive to which a surfactant is added is mainly used as the pressure-sensitive adhesive.

However, the water-soluble pressure-sensitive adhesive has a problem that its water resistance is lowered, and since it has a property of being easily peeled off and removed when immersed in hot water, it cannot be easily peeled off at room temperature water. Also, if the adhesive is a water-soluble adhesive, for example, if it is immersed in room temperature water for 24 hours or more, dissolution of the adhesive is unavoidable, and even if the label body does not spontaneously peel off, the adhesive will be removed from the edge of the label. There are problems such as elution and reduction in commercial value.

[0005]

DISCLOSURE OF THE INVENTION The present invention is to eliminate such inconvenience, and a label attached to an article such as a container requiring a recycling process or a discarding process is hot water, hot water, or By immersing in alkaline hot water or alkaline hot water, it exhibits easy peelability and hand peelability,
The purpose is to allow the adhesive to be easily peeled off from an article such as a container, and to prevent the pressure-sensitive adhesive from eluting from the back end of the label even when immersed in normal temperature water or the like.

[0006]

The invention according to claim 1 of the present invention is to provide hot water on the entire back surface of a label substrate 1 having a specific gravity of less than 1.
A pressure-sensitive adhesive layer 2 is provided which is peeled by hot water, alkaline hot water, and alkaline hot water, the adhesive strength of which is reduced, and the outer peripheral edge region of the label base material 1 or a partial region of the outer peripheral edge thereof, or The label for recycling is characterized in that a non-adhesive layer 3 is provided on the pressure-sensitive adhesive layer 2 in any one of the central regions.

The invention according to claim 2 of the present invention is characterized in that hot water is applied to a region of the back surface of the label substrate 1 having a specific gravity of less than 1 excluding the outer peripheral end, a region excluding a part of the outer peripheral end or a region excluding the central part, It is a recyclable label provided with hot water, alkaline hot water, and a pressure-sensitive adhesive layer 2 that is peeled off due to a decrease in adhesive strength with alkaline hot water.

The invention according to claim 3 of the present invention is the recyclable label according to claim 1 or 2, wherein the pressure-sensitive adhesive layer 2 is not dissolved in cold water, hot water, or hot water. A recyclable label characterized by being dissolved in alkaline hot water and alkaline hot water.

The invention according to claim 4 of the present invention is the recyclable label according to any one of claims 1 to 3, wherein the pressure-sensitive adhesive layer is formed on the entire back surface of the label substrate 1. The recycle-ready label is characterized in that a release sheet is temporarily attached from above 2.

The invention according to claim 5 of the present invention is heat-sensitive in that the label substrate 1 having a specific gravity of less than 1 is peeled off with hot water, hot water, alkaline hot water, or alkaline hot water having reduced adhesive strength. A pressure-sensitive adhesive layer 2 is provided, and a non-tacky layer is provided on the pressure-sensitive adhesive layer 2 in any one of the outer peripheral end region of the label substrate 1, a part of the outer peripheral end region thereof, and the central region. 3 is a recycle-compatible label.

According to a sixth aspect of the present invention, hot water is applied to a region of the back surface of the label substrate 1 having a specific gravity of less than 1 excluding the outer peripheral end, a region excluding a part of the outer peripheral end, or a region excluding the central part, It is a recyclable label, which is provided with a heat-sensitive adhesive layer 2 whose adhesive strength is reduced by hot water and alkaline hot water to cause peeling.

The invention according to claim 7 of the present invention is the recyclable label according to claim 5 or 6, wherein the heat-sensitive adhesive layer 2 is cold water, hot water, hot water, alkaline hot water, or alkaline. A label for recycling, which is a heat-sensitive adhesive layer that does not dissolve in hot water.

The invention according to claim 8 of the present invention is the recyclable label according to any one of claims 1 to 7, wherein the label base material 1 is a transparent or opaque base material. A label for recycling, which is characterized in that a printing layer 4 is provided on the surface of a substrate 1.

The invention according to claim 9 of the present invention is the recyclable label according to any one of claims 1 to 7, wherein the label base material 1 is a transparent base material,
A label for recycling is characterized in that a printing layer 4 is provided on the back surface of the label substrate 1.

[0015]

The reusable label of the present invention uses a pressure-sensitive adhesive or a heat-sensitive adhesive whose adhesive strength decreases with hot water, hot water, and alkaline hot water as the adhesive layer applied to the back surface of the label. The label of the present invention attached to an article such as a container that requires recycling or disposal is
By immersing in hot water, hot water, alkaline hot water, or alkaline hot water, it exhibits easy peelability and hand peelability, and can be easily peeled from an article such as a container with fingers, or a peeling tool or It can be peeled quickly and easily by using a peeling machine or the like as appropriate.

Further, the recyclable label of the present invention is
As the pressure-sensitive adhesive layer applied to the back of the label, use a pressure-sensitive adhesive that does not dissolve in cold water, hot water, or hot water, or a heat-sensitive adhesive that does not dissolve in cold water, hot water, hot water, alkaline hot water, or alkaline hot water. Therefore, the label of the present invention attached to an article such as a container requiring a recycling process or a disposal process has water resistance, and even if it is immersed in normal temperature water for a long time (for example, 24 hours or more). , The adhesive layer does not dissolve, the label body does not spontaneously peel from the article, the adhesive layer does not elute from the edge of the label,
It is possible to prevent the elution of the adhesive from soiling an article such as a commodity or reducing the value of the article such as a commodity.

The recyclable label of the present invention is
Since the non-adhesive layer 3 or the non-adhesive region 5 having no adhesive is provided at the end of the label, the non-adhesive layer 3
The label end of the region or the non-adhesive region 5 can be easily lifted and peeled from the article surface such as the container with fingers, or the label end can be quickly and easily used with a peeling tool or an appropriate peeling machine. Can be lifted and peeled off.

The recyclable label of the present invention is
Since the label base material 1 having a specific gravity of less than 1 is used, the label base material 1 is lighter than water when it is peeled from the article by immersing the label in a peeling liquid such as hot water, alkaline hot water, or hot water.
The label using is floated (floated) in the peeling liquid after being peeled from the article, has a good specific gravity separation, and is easily separated and removed from the article.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the recyclable label of the present invention will be described below in detail. As shown in FIG. 1, the label according to claim 1 of the present invention has a pressure-sensitive property that the adhesive strength is reduced by hot water, hot water, alkaline hot water, and alkaline hot water over the entire back surface of the label substrate 1 to cause peeling. The adhesive layer 2 is provided, and the non-adhesive layer 3 having no adhesiveness is provided along the edge of the label substrate 1 or on the adhesive layer 2 at a part of the edge. . Then, a release sheet 6 including the non-adhesive layer 3 side is temporarily attached to the pressure-sensitive adhesive layer 2 side.

When this label is used, the release sheet 6 is peeled off from the label and put on a predetermined article such as a plastic container, and the non-adhesive layer 3 side of the label end is in a non-adhered state by the pressure-sensitive adhesive layer 2. Stick it.

In the invention according to claim 2 of the present invention, as shown in FIG. 2, the entire back surface of the label base material 1 excluding the back surface end area 5 or the entire back surface except a part of the back surface end area 5 is provided. The pressure-sensitive adhesive layer 2 is provided in which hot water, hot water, alkaline hot water, and alkaline hot water have reduced adhesive strength and exhibit easy peelability. Then, a release sheet 6 including the back surface end region 5 is temporarily attached to the surface of the pressure-sensitive adhesive layer 2.

When this label is used, the release sheet 6 is peeled off from the label and the pressure-sensitive adhesive layer 2 is attached to a predetermined article such as a plastic container with the label end region 5 not attached.

When recycling the article to which the label of the present invention is applied, the entire article or the label portion of the article is
By immersing in hot water, hot water, alkaline hot water, or alkaline hot water, the label end portion of the non-adhesive layer 3 is raised by a finger and pulled to remove from the article.

As the transparent or translucent pressure-sensitive adhesive used for the pressure-sensitive pressure-sensitive adhesive layer 2, the adhesive strength is lowered by hot water, hot water, alkaline hot water, and alkaline hot water to show easy peeling property, A pressure-sensitive adhesive that is insoluble in cold water, hot water, or hot water but is soluble in alkaline hot water or alkaline hot water is used.

For example, as the pressure-sensitive adhesive, a rubber-based adhesive containing a natural rubber or / and a synthetic rubber such as butadiene-styrene rubber or acrylic rubber as a main component, acrylic acid, butyl acrylate, 2-ethylhexyl acrylate. Solvent volatilization type or UV-curing type adhesives such as acrylic type adhesives (manufactured by Toyo Ink Mfg. Co., Ltd .; trade name; Olivine BPW4655; aqueous solvent dispersion type acrylic emulsion type adhesives) containing The pressure sensitive adhesive of can be used.

Further, as the pressure-sensitive adhesive, the following composition is used. That is, methyl acrylate, ethyl acrylate, butyl acrylate, isobutyl acrylate, isoamyl acrylate, 2-
30-50% by weight of (meth) acrylic acid ester such as ethylhexyl acrylate, isooctyl acrylate, lauryl methacrylate, lauryl acrylate,
30 to 60% by weight of (meth) acrylic acid ester having an ether bond such as 2-methoxyethyl acrylate, 2-ethoxyethyl acrylate, 2-butoxyethyl acrylate, methoxydiethylene glycol methacrylate, methoxypolyethylene glycol acrylate, and methoxypolyethylene glycol methacrylate.
Acrylic acid, methacrylic acid, maleic acid, crotonic acid,
Itaconic acid, 2-hydroxyethyl acrylate, 2-
Hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, 2-hydroxybutyl acrylate, 2-hydroxybutyl methacrylate and the like are used to form the basic polymer by using 3 to 20% by weight of a carboxyl group and / or a hydroxy group. Solution polymerization, water-based emulsion polymerization, etc.), after adding to the basic polymer, a polyvalent metal chelate compound such as titanium, aluminum, zircon dissolved in a suitable solvent (eg, ethyl acetate) as an additive,
A pressure sensitive adhesive produced by mixing and stirring can be used.

Further, as the non-adhesive layer 3, a coating layer made of a polyolefin resin such as polyethylene or polypropylene, or an ordinary synthetic resin such as polyethylene terephthalate resin can be adopted. In addition, a transparent or transparent layer which is generally used as a release agent. An opaque solvent volatilization type or ultraviolet curing type silicone resin or wax can be used.

As shown in FIGS. 1 and 2, the above-mentioned claim 1,
The label according to claim 2 is provided with a printing ink layer 4 such as letters, numbers, symbols, and patterns on the surface of the label base material 1 on which appropriate information about an article is displayed. And
A transparent overcoat layer 7 (surface protection layer) is provided on the printing ink layer 4 if necessary.

Further, in the above-mentioned label according to claim 1 and claim 2, as shown in FIGS. 3 and 4, the same printing ink layer 4 is applied as an inverse image to the back surface of the transparent label substrate 1, and The pressure-sensitive adhesive layer 2 is laminated on the printing ink layer 4.

The label according to claim 5 of the present invention, as shown in FIG. 1, has hot water, hot water,
A heat-sensitive adhesive layer 2 is provided, which has an adhesive strength reduced by alkaline warm water and alkaline hot water and exhibits easy peeling property, and is provided along the edge of the label substrate 1 or a part of the edge. A non-adhesive layer 3 that does not exhibit adhesiveness is provided on the adhesive layer 2. This heat-sensitive adhesive layer 2
Does not require the release sheet 6 on the back surface of the label and is not adhered, because the adhesive property is exhibited by heating.

As shown in FIG. 2, the label according to claim 6 of the present invention covers the entire back surface of the label base material 1 having a specific gravity of less than 1, excluding the back surface end area 5, or a part of the back surface end area 5. The heat-sensitive adhesive layer 2 whose adhesive strength is reduced by hot water, hot water, and alkaline hot water to exhibit easy peeling property is provided on the entire back surface except the above. This heat-sensitive adhesive layer 2
Does not require the release sheet 6 on the back surface of the label and is not adhered, because the adhesive property is exhibited by heating.

When the label of the present invention provided with the heat-sensitive adhesive layer 2 is used, the label is heated to a predetermined temperature to develop the adhesiveness, and then the label end is put on a predetermined article such as a plastic container. The non-adhesive layer 3 side of the part is in a non-adhered state,
The adhesive layer 2 having adhesiveness is attached.

As shown in FIGS. 1 and 2, the above-mentioned claim 5,
The label according to claim 6 is provided with a printing ink layer 4 such as letters, numbers, symbols, and patterns on the surface of the label base material 1, which displays appropriate information about the article. And
A transparent overcoat layer 7 (surface protection layer) is provided on the printing ink layer 4 if necessary.

Further, in the above label according to claim 5 and claim 6, the same printing ink layer 4 as shown in FIGS. 3 and 4 is applied as an inverse image to the back surface of the transparent label substrate 1, and The heat-sensitive adhesive layer 2 is laminated on the printing ink layer 4. Although not shown in the drawings, the printing ink layer 4 may be provided on the outer surface of the heat-sensitive adhesive layer 2 in the labels according to claims 5 and 6.

When recycling the article having the label of the present invention provided with the heat-sensitive adhesive layer 2, the entire article or the label portion of the article is heated with hot water, hot water, alkaline hot water, or alkaline hot water. Then, the label end portion of the non-adhesive layer 3 is raised by fingers and pulled to remove from the article.

The transparent or semi-transparent pressure-sensitive adhesive used in the heat-sensitive pressure-sensitive adhesive layer 2 has reduced adhesive strength with hot water, hot water, alkaline hot water, and alkaline hot water, and exhibits easy peelability, Cold water, hot water, hot water, alkaline hot water, and a heat-sensitive adhesive that does not dissolve in alkaline hot water are used. In the present invention, cold water or alkaline cold water exhibits a temperature of less than 20 ° C. (or lower), hot water or alkaline warm water exhibits a temperature of 20 ° C. or higher (or higher than 20 ° C.), hot water Alternatively, the alkaline hot water refers to one that exhibits a temperature of 50 ° C. or higher.

The heat-sensitive adhesive comprises a resin composition of a polymer material, a tackifier, and a solid plasticizer. For example, it does not have adhesiveness at room temperature to less than 60 ° C, but 60 ° C or higher or 90 ° C. Above (for example, 60 ° C. to 120 ° C.) refers to an adhesive that becomes sticky by heating for 1 to several seconds or several seconds to 20 seconds, and that persists for a considerable period after cooling. Usually, the dry coating film of this pressure-sensitive adhesive is tack-free and does not require release paper.

The polymeric material is a component that gives an adhesive force, and examples thereof include polyvinyl acetate, copolyethylene-vinyl acetate, polyacrylic acid ester-based, polyvinyl chloride-based,
Natural rubber, synthetic rubber, copolyvinyl acetate-acrylic acid ester, polyester-based, polyurethane-based polymer compounds and the like are adopted.

The tackifier is a component for enhancing the tackiness when activated by heating, and is a rosin derivative,
There are resins such as terpene resin, petroleum resin, phenol resin and xylene resin.

The solid plasticizer is solid at room temperature, melts when heated to a temperature higher than the melting point, and swells and dissolves the polymer material and the tackifier to develop tackiness.
Since it does not crystallize easily after being melted, the adhesive holding time after heat activation can be extended.

As the solid plasticizer, diphenyl phthalate, dihexyl phthalate, dicyclohexyl phthalate,
Dihydroabietyl phthalate, dimethyl isophthalate,
Sucrose benzoate, ethylene glycol dibenzoate,
Examples include organic compounds which are solid at room temperature, such as trimethylolethane tribenzoate, triglyceride tribenzoate, pentaerythra tetrabenzoate, sucrose octaacetate, and tricyclohexyl N-cyclohexyl-P-toluenesulfonamide citrate.

For example, the following is an example of the composition of the heat-sensitive adhesive. Composition of Thermosensitive Adhesive Aqueous Emulsion of Acrylic Ester Copolymer as Polymer Material
(Solid content) 100 parts by weight Aqueous emulsion of rosin ester as tackifier (softening point 84 ° C)
(Solid content) 100 parts by weight Dicyclohexyl phthalate aqueous dispersion (melting point 64 ° C) as a solid plasticizer
(Solid content) 100 parts by weight These are mixed with a lower alcohol solvent having a solid content concentration of 50% to prepare a heat-sensitive adhesive composition which exhibits an aqueous resin dispersion (emulsion).

Other examples of the composition of the heat-sensitive adhesive are as follows. Thermosensitive adhesive composition Polymer material Thermoplastic resin (solid content) 100 parts by weight Acrylic copolymer containing (meth) acrylic acid ester as a monomer, vinyl acetate copolymer, synthetic rubber, natural rubber As a solid plasticizer, a combination of compounds contained in at least two compound groups out of four compound groups of a polyester compound, a phosphorus compound, a diester compound, and dicyclohexyl phthalate (solid content) 200 parts by weight to 800 As a tackifier, a terpene resin, an aliphatic petroleum resin, an aromatic petroleum resin, a rosin derivative, etc. (solid content) 20 parts by weight to 500 parts by weight In the aqueous dispersion of the solid plasticizer, the thermoplastic resin is added. The water-based emulsion (1), the water-based dispersion of the tackifier, and water are added and stirred until uniform to give an aqueous resin dispersion (emulsion). Preparing heat sensitive adhesive composition. An anionic or nonionic dispersant can be used as the dispersant.

FIG. 5 is a plan view showing an example of the recycling-compatible label of the present invention.
A pressure-sensitive adhesive layer 2 coated with a pressure-sensitive adhesive or a heat-sensitive adhesive is provided, and at one corner of the outer peripheral end region of the label substrate 1,
A non-adhesive layer 3 coated with a non-adhesive agent is provided, or a non-coated region 5 where no adhesive agent is applied is provided.

Further, as shown in FIG. 5, a non-adhesive layer 3 coated with a non-adhesive or an adhesive is applied on the adhesive layer 2 in the label central region of the label substrate 1 excluding the outer peripheral edge region. You may provide the area | region 5 which is not apply | coated.

FIG. 6 is a plan view showing another example of the recyclable label of the present invention, in which the pressure-sensitive adhesive layer 2 coated with a pressure-sensitive adhesive or a heat-sensitive adhesive is applied to the entire back surface of the label substrate 1. Non-adhesiveness is provided in one corner of the outer peripheral end region of the label base material 1 and in the label central region excluding the outer peripheral end region thereof and in a region that continuously connects the one corner and the central region. The non-adhesive layer 3 coated with the agent or the region 5 not coated with the adhesive is provided.

An example of the method for producing the recyclable label according to claim 1 of the present invention will be described below in detail with reference to the side view shown in FIG.

First, a pressure sensitive adhesive layer 2 and a release sheet 6 (a release sheet body having a release property or a release agent-coated sheet) are laminated in this order on the back surface of a label substrate 1 in a web sheet material A ( While taking up and feeding (rolling roll sheet), it is introduced into the first printing unit B (printing plate cylinder 11a, impression cylinder 11b, ink supply means to the plate cylinder (omitted; not shown)), and label substrate A printing ink layer 4 is provided by printing on the surface of No. 1 with an ultraviolet curing type printing ink and curing and drying the ink by an ultraviolet irradiation means (UV).

Subsequently, the sheet material A is applied to the second printing unit C.
(Printing plate cylinder 12a, impression cylinder 12b, ink supply means to the plate cylinder (omitted; not shown)), or coating unit C
It is introduced into (coating cylinder 12a, impression cylinder 12b), printing is performed on the printing ink layer 4 on the surface of the label substrate 1 using a transparent UV-curable printing ink (or a transparent overcoating agent), and UV irradiation is performed. The ink (overcoating agent) is cured and dried by means (UV) to provide the transparent overcoating layer 7. When the transparent label substrate 1 is used, the printing ink layer 4 is provided on the back surface (the pressure-sensitive adhesive layer 2 side) of the label substrate 1, and the overcoat layer 7 is omitted or the label substrate 1 is used. It may be provided on the surface of.

Then, after the release sheet 6 is once peeled from the label base material 1 of the sheet material A to be fed, the label base material 1
(And the pressure-sensitive adhesive layer 2) and the release sheet 6 are separated into two paths, and one label substrate 1 (and the pressure-sensitive adhesive layer 2)
The release agent coating unit D (printing plate cylinder 13a, impression cylinder 13
b, the release agent supply roll 13c, the release agent storage tank 13d), and the other release sheet 6 is diverted to the release agent application unit D to be fed, and then the bonding ruler 14 is attached.
Then, again, the label base material 1 and the release sheet 6 are merged, bonded, and fed.

In the release agent applying unit D, the label base material 1
(And the pressure-sensitive adhesive layer 2) is introduced between the printing plate cylinder 13a and the impression cylinder 13b, and the printing plate cylinder 1 is attached to the pressure-sensitive adhesive layer 2 side of the label substrate 1.
At 3a, an ultraviolet-curable non-adhesive layer forming agent (an ordinary thermoplastic resin agent, a release agent, an ink or a coating agent using a release varnish, etc.) is applied in a pattern (for example, a label end portion), and then, Then, the non-adhesive layer 3 is provided on the surface of the pressure-sensitive adhesive layer 2 by curing and drying with an ultraviolet irradiation means (UV).

Subsequently, the laminated roulo 1 is bonded as described above.
At 4 again, the label base material 1 and the release sheet 6 are merged and bonded together, and the sheet material A is fed.

Subsequently, the sheet material A to be fed is introduced into the die-cutting unit E (rotary die-cutting blade 14a, impression cylinder 14b), and the sheet material A is left on the side of the label substrate 1 with the layer of the release sheet 6 left. By appropriately punching into a label shape and then introducing it into the peeling roll 15 to remove the punched blank label base material 1a (and the blank adhesive layer 2a on the back surface thereof) corresponding to the blank area other than the label shape area. The label base material 1 in the label shape region while being wound and removed by the margin sheet winding means F
(And the pressure-sensitive adhesive layer 2 on the back surface thereof) and the release sheet 6 are wound up by the label winding means G, and the long label of the present invention provided with the pressure-sensitive adhesive layer 2 is manufactured.

The long label of the present invention thus wound up by the label winding means G is appropriately cut into a sheet to obtain a sheet-like book provided with the pressure-sensitive adhesive layer 2. The inventive label (side sectional view of FIG. 1, plan view of FIGS. 5 and 6) is obtained.

Next, another example of the method for producing a recyclable label according to claim 1 of the present invention (transparent release sheet 6
Will be described in detail below based on the side view shown in FIG. 7B.

In this case, the sheet material A is introduced into the first printing unit B and the second printing unit C, and the above-mentioned FIG.
In the same manner as described in (a), the printing ink layer 4 and the overcoat layer 7 are provided on the surface of the label base material 1 and subsequently introduced into the release agent coating unit D.

In the release agent applying unit D, as shown in FIG. 7 (b), the label base material 1 (and the adhesive layer 2) is introduced between the printing plate cylinder 13a and the impression cylinder 13b to remove the label base material. A UV-curable non-adhesive layer-forming agent (an ordinary thermoplastic resin agent, a release agent, an ink or coating agent using a release varnish, etc.) is patterned on the surface of the pressure-sensitive adhesive layer 2 of 1 with the printing plate cylinder 13a (for example, The label base material 1 and the release sheet 6 are joined together again by the pasting ruler 14 as described above, and then pasted, and then ultraviolet irradiation means (UV) is applied. Then, it is cured and dried, and is fed as the sheet material A.

Subsequently, the sheet material A to be fed is introduced into the die-cutting unit E (rotary die-cutting blade 14a, impression cylinder 14b), and the sheet material A is left from the label base material 1 side to leave a layer of the release sheet 6. By appropriately punching it into a label shape, and then introducing it into the peeling roll 15, and blanking the punched blank label base material 1a (and the blank adhesive layer 2a on the back surface thereof) corresponding to the blank area other than the label shape area. The label base material 1 in the label-shaped region 1 is wound and removed by the sheet winding means F.
(And the pressure-sensitive adhesive layer 2 on the back surface thereof) and the release sheet 6 are wound as the label of the present invention by the label winding means G to produce a long label of the present invention having the pressure-sensitive adhesive layer 2. It

The long label of the present invention wound by the label winding means G in this manner is appropriately cut into a sheet to obtain a sheet-like book provided with the pressure-sensitive adhesive layer 2. The inventive label (side sectional view of FIG. 1, plan view of FIGS. 5 and 6) is obtained.

As described above, the adhesive material layer 2 of the label substrate 1
A non-adhesive layer forming agent is applied in a pattern on the surface, the label base material 1 and the release sheet 6 are joined together by a sticking ruler 14 and then stuck, and then cured and dried by an ultraviolet irradiation means (UV). In the case of a label manufactured by the following method, when the release sheet 6 is peeled from the label after that, good smoothness and flatness are obtained on the surface of the non-adhesive layer 3 of the label, and the area of the non-adhesive layer 3 is good. Excellent transparency can be obtained.

Next, an example of a method for producing a recyclable label according to claim 2 of the present invention will be described in detail below with reference to the side view shown in FIG. 7 (a).

In this case, the sheet material A of the label base material 1 on which the pressure-sensitive adhesive layer 2 is not applied is introduced into the first printing unit B and the second printing unit C, and the label base material 1 A printing ink layer 4 and an overcoat layer 7 are provided on the surface. When the transparent label substrate 1 is used, the printing ink layer 4 may be provided on the back surface of the label substrate 1, and the overcoat layer 7 may be omitted or provided on the surface of the label substrate 1. .

The label base material 1 of the sheet material A to be subsequently conveyed
The release sheet 6 is supplied by a path indicated by a dotted line so as not to overlap the surface, and the label base material 1 and the release sheet 6 are separately introduced by two paths, and one label base material 1 is used as an adhesive. Coating unit D (release agent coating unit D in claim 1
Is a unit similar to the printing plate cylinder 13a, the impression cylinder 13
b, the pressure-sensitive adhesive supply roll 13c, the pressure-sensitive adhesive storage tank 13d), the other release sheet 6 is diverted to the pressure-sensitive adhesive application unit D to be sent, and then the bonding roulo 14
Then, again, the label base material 1 and the release sheet 6 are merged, bonded, and fed.

In the adhesive application unit D, as shown in FIG. 7A, the label base material 1 is applied to the printing plate cylinder 13a and the impression cylinder 13.
b between the label substrate 1 and the printing plate cylinder 13a on the surface of the label substrate in the form of a pattern of an ultraviolet curable adhesive (for example, a non-adhesive region 5 where no adhesive is applied is formed at the label end portion). Coating), followed by UV irradiation means (U
V) is cured and dried to form the pressure-sensitive adhesive layer 2 in a pattern, and subsequently, the label base 1 and the release sheet 6 are joined and bonded again by the bonding ruler 14, and then the sheet material A is applied. After being introduced into the die-cutting unit E, in the same manner as described above, the label of the present invention is wound by the label winding means G to produce a long label of the present invention.

The long label of the present invention wound by the label winding means G in this manner is appropriately cut into a sheet shape to obtain the sheet label of the present invention (the side cross section of FIG. 2). The plan views of FIGS. 5 and 6 are obtained.

Next, another example of the method for producing the recyclable label according to claim 2 of the present invention will be described in detail below with reference to the side view shown in FIG. 7B.

In this case, the sheet material A made of the label substrate 1 on which the pressure-sensitive adhesive layer 2 is not applied is introduced into the first printing unit B and the second printing unit C, and the label substrate 1
A printing ink layer 4 and an overcoat layer 7 are provided on the surface of the. When the transparent label substrate 1 is used, the printing ink layer 4 may be provided on the back surface of the label substrate 1, and the overcoat layer 7 may be omitted or provided on the surface of the label substrate 1. .

Label base material 1 of sheet material A to be subsequently conveyed
The release sheet 6 is supplied by a path indicated by a dotted line so as not to overlap the surface, and the label base material 1 and the release sheet 6 are separately introduced by two paths, and one label base material 1 is used as an adhesive. Coating unit D (release agent coating unit D in claim 1
Is a unit similar to the printing plate cylinder 13a, the impression cylinder 13
b, the pressure-sensitive adhesive supply roll 13c, the pressure-sensitive adhesive storage tank 13d), the other release sheet 6 is diverted to the pressure-sensitive adhesive application unit D to be sent, and then the bonding roulo 14
Then, again, the label base material 1 and the release sheet 6 are merged, bonded, and fed.

In the adhesive application unit D, as shown in FIG. 7B, the label substrate 1 is attached to the printing plate cylinder 13a and the impression cylinder 13.
b between the label substrate 1 and the printing plate cylinder 13a on the surface of the label substrate in a pattern of an ultraviolet-curable adhesive (for example, a non-adhesive region where no adhesive is applied is formed at the label end portion). So as to form the pressure-sensitive adhesive layer 2, and subsequently, the label base 1 and the release sheet 6 are merged and bonded again by the bonding ruler 14, and then the ultraviolet irradiation means (U
V), the adhesive layer 2 is cured and dried, and then the sheet material A
After being introduced into the die-cutting unit E, the label of the present invention is taken up by the label take-up means G in the same manner as described above to produce a long-sized label of the present invention provided with the pressure-sensitive adhesive layer 2. To be done.

The long label of the present invention thus wound by the label winding means G is appropriately cut into a sheet to obtain a sheet-like book having the pressure-sensitive adhesive layer 2. The inventive label (side sectional view of FIG. 2, plan view of FIGS. 5 and 6) is obtained.

Next, an example of a method for producing the recyclable label according to claim 5 of the present invention will be described in detail below with reference to the side view shown in FIG.

First, a web sheet material A (winding roll sheet) in which the heat-sensitive adhesive layer 2 is laminated on the back surface of the label base material 1
While unwinding and feeding, it is introduced into the first printing unit B (printing plate cylinder 11a, impression cylinder 11b, ink supply means to the plate cylinder (omitted; not shown)), and ultraviolet curing is performed on the surface of the label substrate 1. Printing is performed using a mold printing ink, and the ink is cured and dried by an ultraviolet irradiation means (UV) to provide a printing ink layer 4. When the transparent label substrate 1 is used, the printing ink layer 4 is provided on the back surface of the label substrate 1 (on the side of the heat-sensitive adhesive layer 2) and the overcoat layer 7 is omitted or It may be provided on the surface of.

Subsequently, the sheet material A is applied to the second printing unit C.
(Printing plate cylinder 12a, impression cylinder 12b, ink supply means to the plate cylinder (omitted; not shown)), or coating unit C
It is introduced into (coating cylinder 12a, impression cylinder 12b), printing is performed on the printing ink layer 4 on the surface of the label substrate 1 using a transparent UV-curable printing ink (or a transparent overcoating agent), and UV irradiation is performed. The ink (overcoating agent) is cured and dried by means (UV) to provide the transparent overcoating layer 7.

Subsequently, the sheet material A to be fed is introduced into the release agent coating unit D (the printing plate cylinder 13a, the impression cylinder 13b, the release agent supply roll 13c, the release agent storage tank 13d), and the label base material 1 (and the heat-sensitive material). A pressure-sensitive adhesive layer 2) is introduced between the printing plate cylinder 13a and the impression cylinder 13b, and an ultraviolet-curable non-adhesive layer-forming agent ( An ordinary thermoplastic resin agent, a release agent, an ink or coating agent using a release varnish, etc.) is applied in a pattern (for example, a portion corresponding to the label end portion), and then an ultraviolet irradiation means (U
V) is cured and dried, and the non-adhesive layer 3 is formed on the surface of the adhesive layer 2.
Then, the sheet material A to be fed is wound by the label winding means G, and the long label of the present invention provided with the pressure-sensitive adhesive layer 2 made of a heat-sensitive pressure-sensitive adhesive is manufactured.

The long label of the present invention wound by the label winding means G in this manner is appropriately cut into a sheet to provide a sheet having the pressure-sensitive adhesive layer 2 made of a heat-sensitive adhesive. A label according to the present invention (a side sectional view of FIG. 1, a plan view of FIGS. 5 and 6) is obtained.

Before being wound by the label winding means G, the die-cutting unit E as shown in FIGS.
Alternatively, the label winding means G may be used to wind the label into the label shape after holding the connecting portion.
Alternatively, the label may be introduced into the die-cutting unit E to manufacture a label in a sheet shape, and the die-cutting margin portion may be wound and collected by the label winding means G.

Next, an example of a method for producing a recyclable label according to claim 6 of the present invention will be described in detail below with reference to the side view shown in FIG.

In this case, the sheet material A made of the label base material 1 on which the adhesive layer 2 is not applied is introduced into the first printing unit B and the second printing unit C, and the surface of the label base material 1 is covered. A printing ink layer 4 and an overcoat layer 7 are provided.
When the transparent label substrate 1 is used, the printing ink layer 4 is provided on the back surface of the label substrate 1 (on the side of the heat-sensitive adhesive layer 2) and the overcoat layer 7 is omitted or It may be provided on the surface of.

The label base material 1 to be subsequently sent is applied to the pressure-sensitive adhesive application unit D (a unit similar to the release agent application unit D in claim 1, the printing plate cylinder 13a, the impression cylinder 13b,
It is introduced into the pressure-sensitive adhesive supply roll 13c and the pressure-sensitive adhesive storage tank 13d).

In the pressure-sensitive adhesive application unit D, as shown in FIG. 8, the label base material 1 is introduced between the printing plate cylinder 13a and the impression cylinder 13b, and the label base material 1 surface is printed by the printing plate cylinder 13a. The heat-sensitive adhesive is applied in a pattern or on the entire surface (for example, so that the non-adhesive region 5 where no adhesive is applied is formed in the label end portion), and subsequently, the drying means 16 for relatively low temperature drying. (The heating temperature is 45 ° C. to less than 60 ° C., if necessary, an air blower is mounted) to dry the layer to provide the heat-sensitive adhesive layer 2 in a pattern, and then the label base material 1 (sheet material A) is wrapped with a label. The long label of the present invention provided with the pressure-sensitive adhesive layer 2 made of a heat-sensitive pressure-sensitive adhesive is wound up by the take-up means G.

The long label of the present invention wound by the label winding means G in this manner is appropriately cut into a sheet to provide a sheet having the pressure sensitive adhesive layer 2 made of a heat sensitive pressure sensitive adhesive. A label of the present invention (a side sectional view of FIG. 2, a plan view of FIGS. 5 and 6) is obtained.

Before winding by the label winding means G, the die-cutting unit E as shown in FIGS. 7 (a) and 7 (b).
Alternatively, the label winding means G may be used to wind the label into the label shape after holding the connecting portion.
Alternatively, the label may be introduced into the die-cutting unit E to manufacture a label in a sheet shape, and the die-cutting margin portion may be wound and collected by the label winding means G.

[0083]

EXAMPLES Examples will be shown below.

<Example 1> The recyclable label of the present invention using a pressure-sensitive adhesive was attached to the surface of a PET (polyethylene terephthalate) bottle, and 24 hours after the label, the bottle and the label were cut into 1 cm square pieces. Then, the cut 100 chips were immersed in alkaline hot water of a 1.5% sodium hydroxide aqueous solution adjusted to a temperature of 85 ° C., and stirred with a stirrer at a rotation speed of 250 rpm. As a result, all the labels of 100 chips were peeled off from the bottle chips in about 1 minute, and the specific gravity separation was also good.

<Example 2> The recyclable label of the present invention using a pressure-sensitive adhesive was stuck on the surface of a PET (polyethylene terephthalate) bottle, and 24 hours after, the bottle and the label were cut into 1 cm square pieces. Then, the cut 100 chips were immersed in hot water adjusted to a temperature of 85 ° C. and stirred with a stirrer at a rotation speed of 250 rpm.
As a result, all the labels of 100 chips were peeled off from the bottle chips in about 3 minutes, and the specific gravity separation was also good.

[0086]

EFFECT OF THE INVENTION The recyclable label of the present invention uses a pressure-sensitive adhesive or a heat-sensitive adhesive whose adhesive strength is reduced by hot water, hot water, and alkaline hot water as the adhesive layer applied to the back surface of the label. The label of the present invention attached to an article such as a container requiring a recycling process or a disposal process is easily peeled and peeled off by immersing it in hot water, hot water, alkaline hot water, or alkaline hot water. Can be quickly and easily peeled from an article such as a container without using a peeling tool (tool) or an appropriate peeling machine or the like, and a peeling tool (tool) or a proper peeling machine, etc. Even if it is used, there is an effect that it can be peeled off quickly and easily.

The label for recycling of the present invention is
As the pressure-sensitive adhesive layer applied to the back of the label, use a pressure-sensitive adhesive that does not dissolve in cold water, hot water, or hot water, or a heat-sensitive adhesive that does not dissolve in cold water, hot water, hot water, alkaline hot water, or alkaline hot water. Therefore, the label of the present invention attached to an article such as a container requiring a recycling process or a disposal process has water resistance.

Therefore, even if the label is immersed in normal temperature water for a long time (for example, 24 hours or more), the pressure-sensitive adhesive layer does not dissolve, and the label body does not spontaneously peel from the article. The pressure-sensitive adhesive layer does not elute from the end of the label, and it is possible to prevent the elution of the pressure-sensitive adhesive from contaminating an article such as a product or reducing the value of the article such as a product.

The recyclable label of the present invention is
A non-adhesive layer 3 or an adhesive-free non-adhesive region 5 is provided at an end of the label, and the label end of the non-adhesive layer 3 region or the non-adhesive region 5 is finger-operated. The label can be easily lifted from the surface of the article and quickly peeled off, or the label edge can be quickly and easily peeled off by using a peeling tool or an appropriate peeling machine.

The recyclable label of the present invention is
A label base material having a specific gravity of less than 1 is used, and when the label is immersed in a stripping solution such as hot water, alkaline hot water, or hot water to be stripped from the article, it floats in the stripping solution after stripping from the article ( Floating) and good specific gravity separation and easy separation and removal from the article.

As described above, in the recyclable label of the present invention, the label attached to an article such as a container that requires recycling or disposal as described above is hot water, hot water, alkaline hot water, or alkaline heat. By immersing in water, it exhibits good easy peeling property and hand peeling property, and can be easily peeled from articles such as containers. It does not elute and does not stain goods such as products. It is a recyclable label that is attached to various recyclable containers such as plastic bottle containers, products such as various products, and various recyclable products. As effective.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an example of a recyclable label of the present invention.

FIG. 2 is a side sectional view showing another example of the recycling label of the present invention.

FIG. 3 is a side sectional view showing another example of the recycling label of the present invention.

FIG. 4 is a side sectional view showing another example of the recyclable label of the present invention.

FIG. 5 is a plan view showing an example of a recycling label of the present invention.

FIG. 6 is a plan view showing another example of the recycling label of the present invention.

7 (a) and 7 (b) are side views showing a method for manufacturing a recyclable label of the present invention.

FIG. 8 is a side view showing a method of manufacturing a recycling label according to the present invention.

[Explanation of symbols]

A ... Sheet material B ... First printing unit C ... Second printing unit D ... Non-adhesive or adhesive printing / application unit
E ... Die-cutting unit F ... Margin winding means G ... Label winding means 1 ... Label base material 2 ... Adhesive layer 3 ... Non-adhesive layer 4 ...
Printing ink layer 5 ... Non-adhesive area 6 ... Release sheet 7 ... Overcoat layer

Claims (9)

[Claims] 1. A label having a specific gravity of less than 1 is provided on the entire back surface of a label substrate 1 with hot water, hot water, alkaline hot water, and a pressure-sensitive adhesive layer 2 which is peeled off when the adhesive strength is reduced by alkaline hot water. The non-adhesive layer 3 is provided on the pressure-sensitive adhesive layer 2 in any one of the region of the outer peripheral end of the base material 1, the region of a part of the outer peripheral end thereof, or the region of the central portion. Recyclable label. 2. Hot water, hot water, alkaline hot water in a region of the back surface of the label substrate 1 having a specific gravity of less than 1 excluding the outer peripheral end, a region excluding a part of the outer peripheral end or a region excluding the central part,
And a pressure-sensitive adhesive layer 2 that is peeled off when the adhesive strength is reduced by alkaline hot water. 3. The pressure-sensitive adhesive layer 2 is not dissolved in cold water, hot water or hot water, but is dissolved in alkaline hot water or alkaline hot water. Recyclable label. 4. The release sheet is temporarily attached to the entire back surface of the label substrate 1 from above the pressure-sensitive adhesive layer 2, and the release sheet is attached. Recyclable label described. 5. A label base material 1 having a specific gravity of less than 1 is provided on the entire back surface thereof with hot water, hot water, alkaline hot water, and a heat-sensitive adhesive layer 2 which is peeled off when the adhesive strength is reduced by alkaline hot water. The non-adhesive layer 3 is provided on the pressure-sensitive adhesive layer 2 in any one of the region of the outer peripheral end of the base material 1, the region of a part of the outer peripheral end thereof, or the region of the central portion. Recyclable label. 6. Adhesion with hot water, hot water, or alkaline hot water to a region of the back surface of a label base material 1 having a specific gravity of less than 1 excluding the outer peripheral end, a region excluding a part of the outer peripheral end, or a region excluding the central part. A recyclable label provided with a heat-sensitive adhesive layer 2 which is peeled off due to reduced strength. 7. The heat-sensitive adhesive layer 2 is a cold-water, hot water, hot water, alkaline hot water, or a heat-sensitive adhesive layer that does not dissolve in alkaline hot water. Recyclable label described in 6. 8. The label base material 1 is a transparent or opaque base material, and a printing layer 4 is provided on the surface of the label base material 1, according to any one of claims 1 to 7. Recyclable label described. 9. The label base material 1 is a transparent base material, and a printing layer 4 is provided on the back surface of the label base material 1, according to any one of claims 1 to 7. Recyclable label.