JPH10123958A - Label, label sheet and container with label - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain such a container and a label that, when the container is to be recycled, can be easily and surely separated from each other and that can be easily and economically recycled by forming a resin layer consisting of a resin which can be dissolved or swollen with a warm liquid and contains particles which expands by heating on the adhesive part of the label. SOLUTION: Both ends 1a, 1b of a label base 1 are adhered with an adhesive part 2 to form the label into a cylinder. The adhesive part 2 includes a resin layer 4 comprising a resin which can be dissolved or swollen with a warm liquid and contains particles which expand by heating. The resin layer 4 is formed inside of the one edge 1a of the label base 1 and consists of such a resin that when the resin is dipped in a warm water or warm alkali soln., for example at 92 deg.C, the resin is dissolved in the liquid. For example, the resin layer 4 consists of a polyvinyl alcohol or methylcellulose which can be dissolved in warm water. As for the particles, hollow microcapsules which seal a liquefied gas having a low boiling point such as isobutane and which expand by heating to a specified temp. are preferably used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a label and a container with a label which can be easily peeled off from the container body after collection to recycle the container body.

[0002]

2. Description of the Related Art In general, as a cylindrical label formed of a label base material such as a stretch film or a heat shrinkable film on the outer periphery of a container, there is a label as shown in FIGS. That is, both ends 21a of the label base material 21 on which printing or the like has been performed,
Reference numeral 21b denotes a cylindrical label 20 bonded with an adhesive 22 or the like, and such a label 20 is externally fitted to the body of a container such as a PET bottle (a container made of polyethylene terephthalate). .

[0003]

In recent years, PET bottles provided with such a label 20 have been widely used as containers for beverages, and the PET bottles with the label are collected to recycle polyethylene terephthalate resin. It is thought to do.

However, in this case, in order to recover only high-purity polyethylene terephthalate resin, a label 20 is required.
It is necessary to separate the PET bottle from the PET bottle and recycle only the PET bottle. However, conventionally, the label 20 was cut by a cutting means such as a cutter to separate the label 20, and the label 20 was peeled off. It was work.

In order to solve such a problem, the label 20 is used as an adhesive 22 for bonding both ends 21a and 21b of the label base material 21 by using, for example, an adhesive having a property of dissolving in warm water or a warm alkaline aqueous solution. A method of separating the label from the container by forming the container in a tubular shape and immersing the container with the label 20 in warm water or a warm alkaline aqueous solution to dissolve the adhesive was considered.

However, even in such a method, it may take time to completely dissolve the adhesive, and it has been difficult to reliably remove the label in a short time.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a label, a label sheet, and a labeled container which are easy to peel off the label from the container after collection, and which are easy to recycle. Make it an issue.

[0008]

Means for Solving the Problems The present invention has been made as a label, a label sheet, and a container with a label in order to solve the above-mentioned problems. In a cylindrical label formed by bonding the portions 1a and 1b with an adhesive portion 2, a resin layer 4 made of a resin containing particles that expand by heating and that can be dissolved or swelled by a warm liquid is provided on the adhesive portion 2. It is being done.

Further, the means as a label sheet is such that an adhesive portion 2 is provided at a predetermined interval in a longitudinal direction of a long sheet-like sheet base 11 on which a plurality of labels 10 are continuously provided. In the label sheet, the adhesive portion 2 is
A front end side adhesive portion 2a to which an adhesive is applied;
2a, a rear-side adhesive portion 2b having a resin layer 4 containing a resin that expands by heating and containing a resin that can be dissolved or swelled by a warm liquid. When the sheet base material 11 is cut between the front end side adhesive parts 2a, the rear end side adhesive part 2b is formed at the rear end part of the label 10, and the front end side adhesive part 2a is formed so as to become the front end part of the subsequent label 10. That is.

[0010] Further, the means as a labeled container includes:
In a container with a label, the label base material 1 is wound around the outer surface of the container 7 and the rear end 1b of the label base material 1 is superimposed on the upper surface of the front end 1a via an adhesive portion 2 and mounted. 2 is that a resin layer 4 made of a resin containing particles which expand when heated and which can be dissolved or swelled by a warm liquid is provided.

The warm liquid of the present invention is 60 to
Water at 100 ° C., alkaline aqueous solution, organic solvent such as alcohol and the like.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, the configuration of the tubular label will be described. FIG.
(1) The label substrate 1 shown in (b) is a label substrate which is made of a synthetic resin film and is provided with an arbitrary indication by printing or the like.

The material of the label substrate 1 may be a single film made of a known material such as polyester, polyvinyl chloride, polystyrene, polypropylene, polyethylene or the like, or a laminated film of various materials. A heat-shrinkable film or a stretch film, which contracts in the circumferential direction of the cylindrical label, is preferably used for these sheet materials, and these can be selected and used depending on the material and shape of the container.

As shown in FIG. 1 (b), the label substrate 1 has one end 1a laminated on the upper surface of the other end 1b via an adhesive portion 2 composed of an adhesive layer 3 and a resin layer 4. Is formed.

The resin layer 4 is provided at one end 1a of the label substrate 1.
And a resin having a property of dissolving in the liquid when immersed in hot water or a warm alkaline aqueous solution at a predetermined temperature (92 ° C. in the present embodiment) or mixed with such a resin. The resin is mixed with particles having the property of expanding when heated.

As the resin, for example, polyvinyl alcohol, methyl cellulose,
Acrylic esters, methacrylic esters, acrylate copolymers and the like can be used as those soluble in warm alkaline aqueous solutions such as water-soluble cellulose derivatives such as hydroxymethylcellulose and carboxymethylcellulose. In particular, polyvinyl alcohol having a saponification degree of 98% or more is preferable since it has appropriate water resistance to water at normal temperature.

As the particles, hollow microcapsules filled with a liquefied gas having a low boiling point, such as isobutane, which expands when heated to the predetermined temperature, are suitable. The microcapsules have a particle size of, for example, 5 to 30 μm. It is preferable that about 10 to 50% by weight be mixed in the resin layer 4.

As the adhesive applied to the adhesive layer 3, any adhesive can be used as long as it can bond the label substrate 1 made of, for example, a urethane resin or an acrylic resin to the resin layer 4. It is preferable that the adhesive layer has a certain degree of adhesive strength, that is, an adhesive strength such that the end portions 1a and 1b of the label substrate 1 do not peel off when a container having a label attached thereto is used.

Next, the case where the cylindrical label 10 as described above is mounted on the container 7 will be described. For example, when the label substrate 1 is made of a stretch film, the diameter of the cylindrical label substrate 1 is determined. And fitted on the body of a container 7 such as a PET bottle as shown in FIG.
12 is formed.

When the label substrate 1 is a heat-shrinkable label formed of a heat-shrinkable film, the label 20 is fitted into the container 7 and then the label 20 is heat-shrinked.
You may make it contact closely.

Next, the case where the thus-formed labeled container 12 is collected and recycled will be described. First, the used labeled container 12 is removed of foreign substances such as metal by washing or the like, and then immersed in hot water of 92 ° C. for 30 minutes with the label 10 attached. Then, the particles contained in the resin layer 4 of the bonding portion 2 bonding the both end portions 1a and 1b of the label substrate 1 expand due to the heat of the hot water.

At this time, also at the interface between the resin layer 4 and the adhesive material layer 3, the adhesive strength is reduced due to the expansion of the particles, and the hot water easily penetrates into this portion, so that the dissolution of the resin layer 4 is more reliable. And quickly.

Therefore, as shown in FIG. 3, the resin layer 4 is dissolved in hot water, so that both ends of the cylindrical label 10 are formed.
Since 1a and 1b are peeled off and the label 10 is developed in a sheet shape,
Container 7 and label 10 are easily separated in warm water.

Further, when the label substrate 1 is formed from a heat-shrinkable film, the heat of the hot water causes the label substrate 1 to re-shrink. The parts 1a and 1b are peeled off more quickly.

In the above-described embodiment, both ends 1a and 1b of the label substrate 1 are formed into a cylindrical shape by superimposing them via the adhesive layer 3 and the resin layer 4. For example, as shown in FIG. Alternatively, both end portions 1a and 1b of the label substrate 1 may be bonded using a separate sheet material such as a tape-shaped film 8.

In this case, the same soluble resin layer 4 and adhesive layer 3 as in the first embodiment are provided on the back side of the film 8.
The film 8 can be adhered to both ends by the adhesive layer 3 to form a cylindrical label 10.

Also in this case, the label 10 according to the above-described embodiment is used.
As in the case of (1), when immersed in warm water or the like, the resin layer 4 is quickly dissolved and the film 8 is peeled off, so that the label 10 is easily separated from the container 7.

Second Embodiment Next, the configuration of a label according to another embodiment will be described. First, 11 shown in FIGS.
Is a label sheet substrate provided continuously, and adhesive portions 2 are formed at predetermined intervals on one surface side of the label sheet substrate 11.

As the material of the label sheet substrate 11, the known material shown as the label substrate 1 of the first embodiment can be used, and furthermore, various materials such as a heat-shrinkable film and a stretch film can be synthesized. Resin films can also be used.

As shown in FIG. 5A, the bonding portion 2 is composed of a front end side bonding portion 2a and a rear end side bonding portion 2b formed adjacent to each other, and cuts between the two bonding portions 2a, 2b. The label 10 is formed by cutting when being attached to the container as the position A.

The rear end side adhesive portion 2b is made of a resin in which particles such as hollow microcapsules which expand when heated to a predetermined temperature are mixed with a resin soluble in hot water or a warm alkaline aqueous solution as in the first embodiment. It comprises a layer 4 and an adhesive layer 3 applied to the surface of the resin layer 4.

The adhesive layer 3 is coated with a heat-sensitive adhesive having a stable adhesive force, for example, a delayed tack type adhesive containing an ethylene-vinyl acetate copolymer as a main component.

On the other hand, the front end side adhesive portion 2a is coated with an adhesive that reduces the adhesive force after a certain period of time. Examples of such an adhesive include an acrylic resin and ethylene-vinyl acetate. A delayed tack-type heat-sensitive adhesive containing a copolymer or the like as a main component can be used.

When using the long label sheet 5 having the above structure, first, as shown in FIG. 5B, the cutting position between the front end bonding portion 2a and the rear end side bonding portion 2b. The sheet is cut at A to form a label 10. At this time, the adjacent rear end-side adhesive portion 2b and front end-side adhesive portion 2a are respectively connected to the rear end portion 11b of the label 10a and the front end portion 11b of the subsequent label 10b.
formed in a.

Each label 10 formed in this manner is mounted on the body of a container 7 such as a PET bottle or the like, as shown in FIG. After the adhesive is heated and activated, it is fixed to the surface of the container 7.

Then, as shown in FIG.
Wrap the label around the torso of
11b is superimposed on the upper surface of the front end 11a, and
After the adhesive layer 3 of 2b is activated by heating, it is bonded (see FIG. 6C). When the label 10 is a heat shrinkable label, the label 10 is heat shrunk after being wound in this manner. When such a delayed tack type adhesive is used as the adhesive, it may be activated before the long label sheet 5 is cut at the cutting position A.

The thus-formed container with a label
When collecting and recycling 12 as well,
Similarly to the embodiment, when the container 7 is immersed in hot water or the like, the particles of the resin layer 4 laminated with the adhesive layer 3 of the rear end side adhesive portion 2b expand, and the resin layer 4 is rapidly dissolved, The label 10 can be easily unwound and separated from the container 7.

The front end side adhesive portion 2a is coated with an adhesive that reduces the adhesive force after a certain period of time as described above, so that when the label 10 is mounted on the container 7, The label can be fixed to the container by bonding the surface of the container 7 to the front end 11a of the label 10, and the workability of mounting the container on the container is good. At the same time, when the container is recycled, the adhesive strength of the front end side adhesive portion 2a of the label 10 is reduced, so that the front end side adhesive portion 2a does not prevent the label 10 from peeling off, and the label can be properly removed from the container. And can be separated.

Further, the front end side bonding portion 2a and the rear end side bonding portion
As the adhesive applied to the adhesive layer 3 of 2b, if the adhesive force to the container 7 is low or weak and the adhesive force to the label sheet substrate 11 is reliable, the same adhesive Agents may be used.

In the second embodiment, the adhesive is applied to the front end side adhesive portion 2a and the rear end side adhesive portion 2b of the label 10 in advance. 4
Only, and when wound around the container 7, an adhesive may be applied to the upper surface of the resin layer 4 at the front end and the rear end,
In this case, it is not necessary to use a heat-sensitive adhesive.

Other Embodiments In the above embodiments, a PET bottle is used as a container to which a label is attached. However, the type of the container is not limited to this. Any container that can be separated and reused may be used.

Further, in each of the above embodiments, the resin layer 4 containing particles that expand due to heat is laminated on the adhesive layer 3. However, for example, resin and particles having such properties are mixed in the adhesive. Then, the adhesive itself may be easily dissolved in hot water or hot alkaline aqueous solution. However, when there is a possibility that the adhesive force of the adhesive may be unstable, it is preferable to laminate the resin layer 4. In short, it is only necessary that the resin layer containing such particles is provided in the bonding portion bonding both ends of the label base material.

Further, the resin layer 4 does not need to be completely dissolved by warm water or the like, and may be a resin having a property such that the resin swells in a liquid and the adhesion at both ends of the label is reduced. I just need.

In each of the above embodiments, the label and the container are separated in hot water or an alkaline aqueous solution at 92 ° C., but the temperature of the liquid such as hot water is not limited to this. It may be a liquid, for example, an organic solvent such as alcohol.

Further, the specific materials and the like of the adhesive, the resin layer and the particles are not limited to the above embodiments, and the mixing ratio of the particles can be arbitrarily changed according to the application. .

[0046]

As described above, according to the present invention, it is possible to easily and reliably separate a label from a container when recycling a container, and to economically and easily reuse such as recycling. This has the effect that it can be performed.

[Brief description of the drawings]

FIG. 1A is a sectional view showing a label according to the present invention,
(B) is an enlarged view of the main part of (a).

FIG. 2 is a perspective view showing a labeled container of the present invention.

FIG. 3 is an enlarged sectional view of a main part showing a state where the label is immersed in warm water.

FIG. 4 is an enlarged sectional view of a main part showing a label according to another embodiment.

FIG. 5A is a cross-sectional view showing a label sheet, and FIG.
FIG. 2 is a sectional view showing a state in which (a) is cut.

6A is a cross-sectional view showing a state where the label is mounted on the container, FIG. 6B is a cross-sectional view showing a state where the label is mounted on the container, and FIG. 6C is a state where the label is wound and mounted on the container. FIG.

FIG. 7 is an enlarged sectional view of a main part of the labeled container.

8A is a cross-sectional view showing a conventional label, and FIG. 8B is an enlarged cross-sectional view of a main part of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Label base material 2 Adhesive part 3 Adhesive layer 4 Resin layer 5 Label sheet 7 Container 10 Label 12 Container with label

Claims (5)

[Claims] 1. A cylindrical label formed by bonding both ends (1a) and (1b) of a label base material (1) with a bonding part (2), and expands the bonding part (2) by heating. A label comprising a resin layer (4) comprising a resin containing particles to be dissolved and capable of being dissolved or swelled by a warm liquid. 2. The both ends (1a) and (1b) of the label substrate (1).
The label according to claim 1, wherein the polymer is polymerized via the adhesive portion (2). 3. The both ends (1a) and (1b) of the label substrate (1).
The label according to claim 1, wherein a sheet material (8) is provided over the both end portions (1a) and (1b) via an adhesive portion (2) so as to be close to each other. 4. A label provided with adhesive portions (2) at predetermined intervals in the longitudinal direction of a long sheet-like sheet substrate (11) provided with a plurality of labels (10) continuously. In the sheet for use, the bonding portion (2) is provided adjacent to the front end side bonding portion (2a) coated with an adhesive, and the front end side bonding portion (2a),
A rear end-side adhesive portion (2b) having a resin layer (4) comprising a resin containing particles which expand when heated and dissolving or swelling with a warm liquid, and comprising the rear end-side adhesive portion (2b) and the front end side When the sheet base material (11) is cut between the adhesive portions (2a), the rear-end adhesive portion (2b) is at the rear end of the label (10), and the front-end adhesive portion (2a) is a subsequent label. (10) A label sheet formed so as to be a front end portion. 5. A label substrate (1) is wound around an outer surface of a container (7), and a rear end (1b) of the label substrate (1) is attached to the front end (1).
a) a container with a label, which is superimposed and attached via an adhesive portion (2) on the upper surface of (a), the adhesive portion (2) is made of a resin containing particles which expand when heated and which can be dissolved or swelled by a warm liquid A labeled container provided with a resin layer (4).