KR20230156852A - Label, Method For Manufacturing The Same And Method For Removing The Same - Google Patents

Abstract

The present invention relates to a label, a method of manufacturing the same, and a method of removing the same, and one aspect of an embodiment of the present invention is a label comprising: a film layer comprising a front and a back surface; A primer layer formed by being applied to the back side of the film layer and containing a binder resin and a silane coupling agent; and an adhesive layer formed by being applied on the primer layer and including a thermoplastic resin and a decomposed resin. Includes.

Description

Label, Method For Manufacturing The Same And Method For Removing The Same}

The present invention relates to labels, methods of making them, and methods of removing them.

Labels are attached to objects to be adhered, such as PET bottles made of polyethylene terephthalate, and are used to display various information related to the object to be adhered or items stored therein. In particular, the label attached to the PET bottle is made of a different material from the PET bottle, such as stretched polypropylene or polypropylene, so in order to recycle the PET bottle, the label must be removed from the PET bottle.

To remove such labels, thermal alkaline separation adhesive is used. When a label is adhered to an object to be adhered using a thermal alkaline separation adhesive, the label may be separated from the object to be adhered due to decomposition of the thermal alkaline separation adhesive by a basic aqueous solution.

However, in the case of such thermal alkaline separation adhesive, the following problems occur.

First, in the case of thermal alkaline separation adhesives, there are many cases in which complete separation by basic aqueous solution is not achieved. Therefore, even if the thermal alkaline separation adhesive is immersed in a basic aqueous solution, there is a risk that part of the label or the thermal alkaline separation adhesive may remain on the adherend.

In addition, the thermal alkaline separation adhesive is used in a relatively high viscosity state to ensure adhesive strength between the adherend and the label. However, high viscosity adhesives are generally applied through a slot die coating process, which has the disadvantage of being relatively low-speed and high cost. Therefore, in the related art, a disadvantage arises in that the cost of attaching a label using a thermal alkaline separation adhesive is relatively increased.

Republic of Korea Patent No. 2155387 (Name: Hot melt pressure sensitive adhesive for labeling) Republic of Korea Patent No. 2336481 (Name: Water-based adhesive composition) Republic of Korea Patent No. 2280739 (Name: Labeling adhesive composition, manufacturing method thereof, adhesive sheet and article containing the same)

The present invention is intended to solve the problems caused by the prior art as described above, and the purpose of the present invention is to show a label that can be more easily separated from an adherend, a method of manufacturing the same, and a method of removing the same.

Another object of the present invention is to show a cost-saving label, its manufacturing method, and its removal method.

One aspect of the embodiment of the present invention for achieving the above-described object is a label comprising: a film layer including a front and back surface; A primer layer formed by being applied to the back side of the film layer and containing a binder resin and a silane coupling agent; and an adhesive layer formed by being applied on the primer layer and including a thermoplastic resin and a decomposed resin. Includes.

In one aspect of the embodiment of the present invention, when the adhesive layer is immersed in a basic aqueous solution while adhered to the adherend, the adhesive layer may be separated from the adherend.

In one embodiment of the present invention, the primer layer and the adhesive layer are partially applied and defined, and may further include a capillary through which a basic aqueous solution flows into the area between the film layer and the adherend.

In one embodiment of the present invention, the specific gravity of the film layer may be less than 1.

In one embodiment of the present invention, the primer layer may further include silica powder.

In one embodiment of the present invention, the primer layer may include 4 to 8 wt% of silica powder with an average size of 2 to 3.5 μm.

In one embodiment of the present invention, the decomposed resin may have an acid value of 100 mgKOH/g or more.

In one embodiment of the present invention, the adhesive layer may further include one or more of a tackifier containing a hydroxyl group and a liquid resin having a molecular weight of 1000 or less.

In one embodiment of the present invention, the tackifier may be hydroxylated polyester, and the liquid resin may be ethoxylated alcohol.

Another aspect of the embodiment of the present invention is a method of manufacturing the label, including: a surface treatment step of corona charging the back side of the film layer; A primer layer forming step in which the primer layer is formed on the back side of the film layer; and an adhesive layer forming step in which the adhesive layer is formed on the primer layer.

In another embodiment of the present invention, in the primer layer forming step and the adhesive layer forming step, the primer layer and the adhesive layer may be formed by gravure coating a primer solution and an adhesive solution, respectively.

In another embodiment of the present invention, in the primer layer forming step and the adhesive layer forming step, the viscosity of the primer solution and the adhesive solution may be 900 CPs or less.

In another aspect of the embodiment of the present invention, in the primer layer forming step and the adhesive layer forming step, the primer solution and the adhesive solution are partially applied so that a capillary is defined between the film layer and the adhesive layer. You can.

Another aspect of the embodiment of the present invention is a method for removing the label adhered to an adherend, comprising: an immersion step in which the label adhered object is immersed in a basic aqueous solution; A separation step in which the label is separated from the adherend; and a recovery step in which the separated labels are recovered.

In another embodiment of the present invention, the basic aqueous solution in the immersion step has a temperature of 80° C. or higher and may contain 2 wt% or more of sodium hydroxide.

In another embodiment of the present invention, in the separation step, the basic aqueous solution may flow into a capillary defined by partially applying the primer layer and the adhesive layer.

In another embodiment of the present invention, the specific gravity of the film layer is less than 1, and the label floating on the surface of the basic aqueous solution in the recovery step can be recovered.

According to the label, its manufacturing method, and its removal method according to the embodiment of the present invention, the following effects can be expected.

First, the bonding force between the film layer and the adhesive layer is increased by the primer layer of the label according to the embodiment of the present invention, and a capillary is further included between the film layer and the adherend. Therefore, the label immersed in the basic aqueous solution can be more easily separated from the adherend.

In addition, since the primer solution and adhesive solution according to an embodiment of the present invention have a viscosity of 900 CPs or less, they can be gravure coated on the back side of the film layer and on the primer layer.

1 is a cross-sectional view of a label adhered to an object to be adhered according to an embodiment of the present invention.
Figure 2 is a flow chart of a label manufacturing method according to an embodiment of the present invention.
Figure 3 is a flowchart of a method for removing a label adhered to an adherend according to an embodiment of the present invention.

Hereinafter, a label according to an embodiment of the present invention will be described in more detail with reference to the attached drawings.

Figure 1 is a cross-sectional view of a label adhered to an object to be adhered according to an embodiment of the present invention.

Referring to FIG. 1, the label 10 according to this embodiment is adhered to the adherend 20, and includes a film layer 100, a printing layer 200, a primer layer 300, an adhesive layer 400, and a capillary ( 500). In particular, in this embodiment, the label 10 adhered to the adherend 20 may be separated from the adherend 20 by being immersed in a basic aqueous solution. For example, the adherend 20 may be a recyclable plastic container such as polyethylene terephthalate.

More specifically, the film layer 100 includes a front surface and a back surface. In addition, the film layer 100 may be formed of a polymer, for example, stretched polypropylene, polypropylene, etc. Additionally, the specific gravity of the film layer 100 may be less than 1 so that it can float on the water surface. Additionally, the thickness of the film layer 100 may be 80 to 100 μm and may be 90% or more of the thickness of the label 10. Therefore, the specific gravity of the film layer 100 and the specific gravity of the label 10 may be similar to each other. Accordingly, as the film layer 100 floats on the water surface, the label 10 may also float on the water surface.

In particular, in this embodiment, the back side of the film layer 100 may be corona charged. As will be described later, this is to increase the adhesive strength of the film layer 100 and the primer layer 300. The back side of the film layer 100 is oxidized to form a polar functional group, and the film layer By increasing the surface energy of the back side of (100), the adhesive strength between the primer layer 300 and the film layer 100 can be increased.

Next, the printing layer 200 is provided on the surface of the film layer 100 and can display various information related to the adherend 20 or articles stored therein. For example, the print layer 200 may be formed by printing ink on the surface of the film layer 100. Additionally, the thickness of the printed layer 200 may be less than 2㎛.

Meanwhile, the primer layer 300 is formed by being applied to the back side of the film layer 100. In this embodiment, the primer layer 300 serves to prevent the adhesive layer 400 from transferring to the adherend 20 during the process of separating the label 10 from the adherend 20. Do it. Substantially, the primer layer 300 allows the adhesive strength between the film layer 100 and the adhesive layer 400 to have a higher value than the adhesive strength between the adhesive layer 400 and the adherend 20. It plays a role. In this embodiment, the primer layer 300 includes a binder resin and a silane coupling agent. Additionally, the thickness of the primer layer 300 may be less than 2㎛.

The binder resin is a resin with adhesive strength, and in this embodiment, the binder resin may include polyurethane and a curing agent. In this example, polyurethane having a glass transition temperature of 70 to 75°C is used, and toluene diisocyanate and hexamethylene diisocyanate may be used as the curing agent. With such a curing agent, initial curing progresses relatively quickly, and initial adhesion can be particularly increased. Additionally, the binder resin may further include chlorinated polypropylene to increase adhesion.

Next, the silane coupling agent acts as an interfacial binder and includes a reactive group capable of combining with an organic material and a reactive group capable of combining with an inorganic material. Therefore, the adhesion of the primer layer 300 can be increased. And in this embodiment, the silane coupling agent may include an epoxy group or a vinyl group.

Additionally, the primer layer 300 may further include silica powder. Such silica powder is intended to increase the adhesive strength between the primer layer 300 and the adhesive layer 400, and the surface roughness of the primer layer 300 is increased by the silica powder, thereby substantially reducing the primer layer. The surface area between 300 and the adhesive layer 400 may be increased. Therefore, ultimately, the adhesive strength between the primer layer 300 and the adhesive layer 400 can be increased. For example, the average size of the silica powder may be 2 to 3.5 ㎛, and the primer layer 300 may include 4 to 8 wt% of silica powder.

Next, the adhesive layer 400 is formed by applying it on the primer layer 300. Substantially, the label 10 is adhered to the adherend 20 by the adhesive layer 400. For example, the adhesive layer 400 may be formed of a hot melt adhesive containing a thermoplastic resin and a decomposed resin. Additionally, the thickness of the adhesive layer 400 may be less than 2㎛.

In this embodiment, the thermoplastic resin may include polyurethane produced by synthesizing polyisocyanate, polyol, etc. Here, the polyisocyanate may include, for example, any one of toluene diisocyanate, methylene diphenyl diisocyanate, and isophorone diisocyanate. Additionally, during the synthesis of polyurethane used as the thermoplastic resin, 1,4-butanediol, 1,6-hexanediol, ethylene diamine, and isophorone diamine may be further added as chain extenders.

Next, as the decomposition resin, a base-decomposable decomposition resin is used for decomposition by a basic aqueous solution. In this embodiment, the decomposed resin may be a phenol resin, hydrogenated rosin, or modified rosin that has an acid value of 100 mgKOH/g or more and contains a carboxyl group.

In addition, the adhesive layer 400 may further include one or more of a tackifier containing a hydroxyl group and a liquid resin with a molecular weight of 1000 or less as an additive to increase adhesive strength and base decomposability. In this embodiment, hydroxylated polyester may be used as the tackifier, and ethoxylated alcohol may be used as the liquid resin.

Next, the capillary 500 is located in the area between the film layer 100 and the adhesive 20 and is in contact with the basic aqueous solution during the separation of the label 10 by the basic aqueous solution. ) plays a role in increasing the surface area of . Substantially, as the basic aqueous solution flows into the capillary 500, the surface area of the adhesive layer 400 in contact with the basic aqueous solution can be increased. For example, the capillary 500 may be defined by partially applying the primer layer 300 and the adhesive layer 400.

In this embodiment, the primer layer 300 and the adhesive layer 400 are respectively applied to the back side of the film layer 100 and on the primer layer 300 in a preset pattern to form the capillary 500. there is. For example, the primer layer 300 and the adhesive layer 400 may be applied on the back side of the film layer 100 and on the primer layer 300 in a pattern in which polygons of a preset size are repeated. In addition, the capillary 500 may be defined by the area where the primer layer 300 and the adhesive layer 400 are not applied.

Hereinafter, the label manufacturing method according to an embodiment of the present invention will be described in more detail with reference to the attached drawings.

Figure 2 is a flowchart of a label manufacturing method according to an embodiment of the present invention.

Referring to FIG. 2, the method of manufacturing the label 10 according to this embodiment includes a surface treatment step (S110), a primer layer forming step (S120), and an adhesive layer forming step (S130).

More specifically, in the surface treatment step (S110), the back side of the film layer 100 is corona charged. As described above, this can increase the adhesive strength between the film layer 100 and the primer layer 300.

Next, in the primer layer forming step (S120), the primer layer 300 is formed. In the primer layer forming step (S120), a primer solution containing a binder resin, a silane coupling agent, and silica powder is applied to the back side of the film layer 100 and dried at 40 to 50° C. to form the primer layer 300. ) can be formed.

Next, in the adhesive layer forming step (S130), the adhesive layer 400 is formed. In the adhesive layer forming step (S130), an adhesive solution containing a thermoplastic resin, decomposed resin, tackifier, and liquid resin is applied on the primer layer 300 and dried at 40 to 70° C. to form the adhesive layer 400. ) can be formed.

In particular, in this embodiment, in the primer layer forming step (S120) and the adhesive layer forming step (S130), the primer solution and the adhesive solution may be gravure coated to form the primer layer 300 and the adhesive layer 400. there is. At this time, for efficient gravure coating, the viscosity of the primer solution and adhesive solution may be 900 CPs or less.

In this embodiment, in the primer layer forming step (S120) and the adhesive layer forming step (S130), the primer solution and the adhesive solution are preset on the back side of the film layer 100 and the primer layer 300, respectively. The primer layer 300 and the adhesive layer 400 may be formed by partially applying a pattern. Accordingly, the primer solution and the adhesive solution may not be applied to some areas on the back side of the film layer 100 and on the primer layer 300, respectively. In addition, the capillary 500 may be defined as an area where the primer solution and the adhesive solution are not applied.

Hereinafter, a method of removing a label adhered to an adhesive object according to an embodiment of the present invention will be described in more detail with reference to the attached drawings.

Figure 3 is a flowchart of a method for removing a label adhered to an adherend according to an embodiment of the present invention.

Referring to FIG. 3, the method of removing the label 10 attached to the adherend 20 according to the present embodiment includes an immersion step (S210), a separation step (S220), and a recovery step (S230).

More specifically, in the immersion step (S210), the label 10 attached to the adherend 20 is immersed in a basic aqueous solution. As described above, for easy separation of the label 10, a basic aqueous solution containing 2 wt% or more of sodium hydroxide at a temperature of 80° C. or higher can be used.

Next, in the separation step (S220), the label 10 is separated from the adherend 20. At this time, the basic aqueous solution flows into the capillary 500, so that the label 10 can be more easily separated from the adherend 20.

Finally, in the recovery step (S230), the label 10 separated from the adherend 20 is recovered. In particular, as described above, by using the film layer 100 with a specific gravity of less than 1, the label 10 can be more easily recovered by floating on the water surface of the basic aqueous solution.

Hereinafter, the present invention will be described in more detail through examples and experimental examples. These examples and experimental examples are only for illustrating the present invention in more detail, and it will be apparent to those skilled in the art that the scope of the present invention is not limited to these examples and experimental examples.

Example

<Preparation Examples 1 to 6 and Comparative Examples 1 to 4>

In Preparation Examples 1 to 6 and Comparative Examples 1 to 4, a primer layer 300 was formed by gravure coating entirely on the back of the corona-charged film layer 100, and an adhesive layer 400 was formed on the primer layer 300. This was formed as a whole. As the adhesive layer 400, an adhesive tape applied to 7475 PV2 from TESA was used. In relation to the primer layer 300, the mass ratio and average size of the silica powder were tested as shown in [Table 1] below.

Mass ratio of silica powder (wt%) Average diameter of silica powder (㎛) Manufacturing Example 1 4 2.75 Production example 2 5 2.75 Production example 3 6 2.75 Production example 4 8 2.75 Production example 5 6 2.0 Production example 6 6 3.5 Comparative Example 1 3 2.75 Comparative Example 2 10 2.75 Comparative Example 3 6 1.25 Comparative Example 4 6 4.25

<Preparation Examples 7 to 12 and Comparative Examples 5 and 6>

In Preparation Examples 7 to 12 and Comparative Examples 5 to 6, the primer layer 300 was formed under the same conditions as Preparation Example 3. And in Preparation Examples 7 to 12 and Comparative Examples 5 to 6, the adhesive layer 400 was formed entirely on the primer layer 300 by gravure coating. And as the adhesive layer 400, a hot melt adhesive containing a thermoplastic resin and a decomposed resin was used. In particular, in Production Examples 7 to 12, polyurethane resin was used as the thermoplastic resin, and one of a phenol resin containing a carboxyl group, hydrogenated rosin, and modified rosin was used as the decomposition resin. As additives, an adhesion agent was added to Preparation Example 10, a liquid resin was added to Preparation Example 11, and a tackifier and liquid resin were added to Preparation Example 12. In particular, hydroxylated polyester was used as a tackifier, and ethoxylated alcohol was used as a liquid resin. The mass ratio of the thermoplastic resin, decomposed resin, tackifier, and liquid resin constituting the adhesive layer 400, and the type and acid value of the decomposed resin were tested as shown in [Table 2] below.

thermoplastic resin decomposed resin Tackifier liquid resin mass ratio
(wt%) mass ratio
(wt%) type Sanga
(㎎KOH/g) mass ratio
(wt%) mass ratio
(wt%) Production example 7 50 50 modified rosin 290 - - Production example 8 50 50 hydrogenated rosin 163 - - Production example 9 50 50 hydrogenated rosin 240 - - Production example 10 30 60 hydrogenated rosin 163 10 - Production example 11 30 60 hydrogenated rosin 163 - 10 Production example 12 30 50 hydrogenated rosin 163 10 10 Comparative Example 5 50 50 phenolic resin 90 - - Comparative Example 6 50 50 modified rosin 80 - -

<Production Example 13>

In Preparation Example 13, the primer layer 300 and the adhesive layer 400 were formed on the back side of the film layer 100 in the same manner as Preparation Example 12. However, in Preparation Example 13, the primer layer 300 and the adhesive layer 400 were gravure coated in a square grid-shaped pattern so that the capillaries 500 could be defined.

Experiment example

<Experimental Example 1>

20 minutes after the labels 10 of Preparation Examples 1 to 6 and Comparative Examples 1 to 4 are adhered to the adherend 20 made of polyethylene terephthalate, the label 10 is separated from the adherend 20. physically separated. The area of the adhesive layer 400 transferred to the adherend 20 is shown in Table 3 below.

Area where the adhesive layer is transferred to the adherend (%) Manufacturing Example 1 25 Production example 2 10 Production example 3 0 Production example 4 20 Production example 5 10 Production example 6 15 Comparative Example 1 50 Comparative Example 2 55 Comparative Example 3 45 Comparative Example 4 50

Referring to [Table 3], in the case of Preparation Examples 1 to 4 in which the average size of the silica powder is 2.75㎛ and the mass ratio is 4 to 8 wt%, the adhesive layer 400 is transferred to the adherend 20. It can be confirmed that the area is less than 25%. In particular, in the case of Preparation Examples 3, 5, and 6 in which the mass ratio of the silica powder is 6 wt% and the average diameter of the silica powder is 2 to 3.5 μm, the area where the adhesive layer 400 is transferred to the adherend 20 is It can be confirmed that it is less than 15%.

On the other hand, in the case of Comparative Examples 1 and 2 where the mass ratio of silica powder is less than 4 wt% or more than 8 wt%, it can be confirmed that the area where the adhesive layer 400 is transferred to the adherend 20 is more than 50%. there is. In addition, in the case of Comparative Examples 3 and 4 in which the average size of the silica powder was less than 2㎛ or greater than 3.5㎛, it could be confirmed that the area where the adhesive layer 400 was transferred to the adherend 20 was more than 45%. .

Therefore, when the mass ratio and average diameter of the silica powder contained in the primer layer 300 are 4 to 8 wt% and 2 to 3.5 ㎛, respectively, the mass ratio and average diameter of the silica powder contained in the primer layer 300 are Compared to other cases, it can be seen that the area where the adhesive layer 400 is transferred to the adherend 20 is relatively small, and from this, the adhesive strength between the primer layer 300 and the adhesive layer 400 is You can see that it is relatively high.

<Experimental Example 2>

20 minutes after the labels 10 of Preparation Examples 7 to 12 and Comparative Examples 5 to 6 were adhered to the adherend 20 made of polyethylene terephthalate, the label 10 attached to the adherend 20 ) was immersed in a 3% sodium hydroxide aqueous solution at 80°C for 30 minutes to separate the label 10 from the adherend 20. This experiment was repeated 20 times, and the probability that the label 10 is separated from the adherend 20 and the area where the adhesive layer 400 remains on the adherend 20 are shown in [Table 4] below. same.

Label separation probability (%) Adhesive layer residual area (%) Production example 7 75 20 Production example 8 75 10 Production example 9 70 15 Production example 10 80 10 Production example 11 85 5 Production example 12 85 5 Comparative Example 5 30 20 Comparative Example 6 20 15

Referring to [Table 4], in the case of Preparation Examples 7 to 12 in which the acid value of the decomposed resin is 100 mgKOH/g or more, the probability that the label 10 is separated from the adherend 20 is more than 70%, and the It can be confirmed that the remaining area of the adhesive layer 400 on the adherend 20 is 20% or less. In particular, in the case of Preparation Examples 10 to 12 in which one or more of a tackifier or a liquid resin was added to the adhesive layer 400, the probability that the label 10 is separated from the adherend 20 and the adhesive layer 400 The area remaining on the adherend 20 is 80% or more and 10% or less, respectively, so that the label 10 is separated more efficiently, and less adhesive layer 400 remains on the adherend 20. You can check that.

On the other hand, in the case of Comparative Examples 5 and 6, where the acid value of the decomposed resin is less than 100 mgKOH/g, the probability of the label 10 being separated from the adherend 20 is 30% or less, and Preparation Examples 7 to 7 It can be seen that the separation probability of the label 10 is relatively lower than that of 12.

Therefore, it can be confirmed that the label 10 is more easily separated from the adherend 20 when the acid value of the decomposed resin is 100 mgKOH/g or more. In addition, when one or more of the tackifier and liquid resin is added to the adhesive layer 400, not only is the label 10 more easily separated from the adherend 20, but the adhesive layer 400 is also more easily separated from the adhesive layer 400. It can be confirmed that less amount remains on the adherend 20.

<Experimental Example 3>

20 minutes after the label 10 of Preparation Example 12 and Preparation Example 13 was adhered to the adherend 20 made of polyethylene terephthalate, it was immersed in a 2% sodium hydroxide aqueous solution at 80° C. for 10 minutes to form the label (10). ) was separated from the adherend 20. This experiment was repeated 20 times, and the probability of the label 10 being separated from the adherend 20 is shown in [Table 5] below.

Label separation probability (%) Production example 12 0 Production Example 13 100

Referring to [Table 5], the case of Preparation Example 13 in which the primer layer 300 and the adhesive layer 400 were gravure-coated in a rectangular grid-shaped pattern is the case in which the primer layer 300 and the adhesive layer 400 are applied to the entire surface. Compared to Example 12, it was confirmed that the probability of the label 10 being separated from the adherend 20 was relatively high. Accordingly, it can be confirmed that when the label 10 includes the capillary 500, it is relatively quickly separated from the adherend 20 under the same conditions.

10: label 100: film layer
200: Printing layer 300: Primer layer
400: Adhesive layer 500: Capillary tube
20: Adhesive object

Claims (17)

A film layer 100 including a front and back surface;
A primer layer 300 formed by being applied to the back side of the film layer 100 and containing a binder resin and a silane coupling agent; and
An adhesive layer 400 formed by being applied on the primer layer 300 and containing a thermoplastic resin and a decomposed resin; A label containing .
According to paragraph 1,
A label in which the adhesive layer (400) is separated from the adherend (20) when immersed in a basic aqueous solution while the adhesive layer (400) is adhered to the adherend (20).
According to paragraph 2,
The label is defined by partially applying the primer layer 300 and the adhesive layer 400, and further includes a capillary 500 through which a basic aqueous solution flows into the area between the film layer 100 and the adhesive 20.
According to paragraph 2,
A label wherein the specific gravity of the film layer 100 is less than 1.
According to paragraph 2,
The primer layer 300 is a label further containing silica powder.
According to clause 5,
The primer layer 300 is a label containing 4 to 8 wt% of silica powder with an average size of 2 to 3.5 ㎛.
According to paragraph 2,
The decomposed resin is a label having an acid value of 100 mgKOH/g or more.
According to paragraph 2,
The adhesive layer 400 is a label further comprising at least one of a tackifier containing a hydroxyl group and a liquid resin having a molecular weight of 1000 or less.
According to clause 8,
A label where the tackifier is hydroxylated polyester and the liquid resin is ethoxylated alcohol.
In the method of manufacturing the label (10) of claim 1:
A surface treatment step (S110) in which the back surface of the film layer 100 is subjected to corona charging;
A primer layer forming step (S120) in which the primer layer 300 is formed on the back side of the film layer 100; and
A label manufacturing method comprising an adhesive layer forming step (S130) in which the adhesive layer 400 is formed on the primer layer 300.
According to clause 9,
In the primer layer forming step (S120) and the adhesive layer forming step (S130),
The primer layer 300 and the adhesive layer 400 are formed by gravure coating a primer solution and an adhesive solution, respectively.
According to clause 11,
In the primer layer forming step (S120) and the adhesive layer forming step (S130),
A label manufacturing method wherein the viscosity of the primer solution and adhesive solution is 900 CPs or less.
According to clause 11,
In the primer layer forming step (S120) and the adhesive layer forming step (S130),
The primer solution and the adhesive solution are partially applied to the primer layer 300 and the adhesive layer 400 so that a capillary tube 500 is defined between the film layer 100 and the adherend 20.
In the method of removing the label (10) manufactured according to claim 10 and adhered to the adherend (20):
An immersion step (S210) in which the adherend 20 to which the label 10 is attached is immersed in a basic aqueous solution;
A separation step (S220) in which the label 10 is separated from the adherend 20; and
A label removal method comprising a recovery step (S230) in which the separated label (10) is recovered.
According to clause 14,
The basic aqueous solution in the immersion step (S210) has a temperature of 80° C. or higher and contains 2 wt% or more of sodium hydroxide.
According to clause 14,
In the separation step (S220),
A label removal method in which the basic aqueous solution flows into a capillary (500) defined by partially applying the primer layer (300) and the adhesive layer (400).
According to clause 14,
The specific gravity of the film layer 100 is less than 1,
A label removal method in which the label (10) floating on the surface of the basic aqueous solution is recovered in the recovery step (S230).

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