JP2020140164A - label - Google Patents

Abstract

To provide a label with a low impact on the environment capable of reducing the amount of garbage and the impact on the marine ecosystem by mainly using materials that biodegrade in the environment.SOLUTION: A label is used, which has a moisture-proof layer on both sides of a base material layer made of cellophane via an adhesive layer. The moisture-proof layer contains at least one selected from polyamide-based resin, nitrocellulose-based resin, and polyvinylidene chloride-based resin. The moisture permeability is 1000 g/m2 24 h or less, and the total coating amount of the moisture-proof layer is 1.0 g/m2 or more and 7.0 g/m2 or less.SELECTED DRAWING: Figure 1

Description

The present invention relates to a label attached to a container or the like.

Containers such as bottles and jars containing beverages, seasonings, jams, etc. are generally labeled with a label indicating the contents. Examples of this label include a label to be attached to a container with an adhesive or the like, a label in which a heat-shrinkable film is wrapped around the body of the container and brought into close contact by heat-shrinking (Patent Document 1), or a film constituting the label. A label wound around a container body is known by adhering one end to the container body, circling the film around the container, and adhering the films to each other at the other end of the film (Patent Document 2).

By the way, recently, the problem of processing petroleum products has been pointed out from an environmental point of view. For example, plastic labels and containers are often rejected after use, which can be problematic. Specifically, polyolefin resins, polyethylene terephthalate (PET), and the like are used as packaging plastics, but these generate a large amount of heat during combustion and may damage the combustion furnace during the combustion process. In addition, although it is conceivable to perform landfill treatment, there are problems such as shortening the life of the landfill site because it remains almost undecomposed due to its chemical and biological stability. Furthermore, when these are dumped into the ocean, due to their chemical and biological stability, they become finer and float in the sea as they are, which may affect the ecosystem in the sea.

On the other hand, it is conceivable to use a biodegradable resin such as cellophane for the label. Examples of the label using cellophane include the label described in Patent Document 3.

Japanese Unexamined Patent Publication No. 2012-032657 JP-A-2007-108307 JP-A-2018-047926

However, although cellophane is used in the label described in Patent Document 3, a polyolefin resin or the like is used as the base material. Therefore, it cannot be said that the problem of environmental load has been solved. The reason why cellophane is used in Patent Document 3 is that when moisture adheres to the label surface, it is absorbed by the cellophane layer to prevent dew condensation.

Therefore, the present invention provides a label that has a low impact on the environment by mainly using a material that biodegrades in the environment, thereby reducing the amount of waste and the impact on the marine ecosystem. With the goal.

As a result of studies by the present inventor, it has been found that the above problems can be solved by using biodegradable cellophane as the base material layer of the label, and the present invention has been completed.
That is, the gist of the present invention is as follows.

[1] A label having a moisture-proof layer on both sides of a base material layer made of cellophane via an adhesive layer.
[2] The label according to [1], wherein the moisture-proof layer is a layer containing at least one selected from a polyamide resin, a nitrocellulose resin, and a polyvinylidene chloride resin.
Label according to [3] moisture permeability is equal to or less than ^{1000g / m 2 · 24h [1} ] or [2].
[4] The item according to any one of [1] to [3], wherein the total coating amount of the moisture-proof layer is 1.0 g / m ² or more and 7.0 g / m ² or less. label.

Since the label according to the present invention uses cellophane as the base material layer, it has biodegradability and can be easily decomposed even in an environment to reduce the environmental load.
In addition, since the moisture-proof layer is arranged so that the base material layer does not come into contact with the outside, even if dew condensation occurs, the base material layer is prevented from coming into contact with moisture, and wrinkles are generated due to the swelling of the base material layer. , It is possible to suppress the occurrence of delamination between the base material layer and the printing layer.
Further, since the adhesive layer is provided between the base material layer and the moisture-proof layer, the adhesion between the base material layer and the moisture-proof layer can be improved, and delamination can be further suppressed.

Sectional drawing which shows the example of the label which concerns on this invention.

Hereinafter, the present invention will be described with reference to embodiments.
The present invention relates to a label, which comprises having a moisture-proof layer on both sides of a base material layer via an adhesive layer.

As an example of the label according to the present invention, the label shown in FIG. 1 can be given. In the label 10 shown in FIG. 1, a moisture-proof layer 3 is provided on the surface of the base material layer 1 on the outside air side via an adhesive layer 2. Further, the printing layer 4 and the moisture-proof layer 3 are provided on the surface of the base material layer 1 on the container side via the adhesive layer 2.
In FIG. 1, the printing layer 4 is formed between the adhesive layer 2 on the container side of the base material layer 1 and the moisture-proof layer 3, but is not necessarily limited to this position, for example, the base material layer. It may be formed between the adhesive layer 2 on the outside air side of 1 and the moisture-proof layer 3.

[Base material layer]
The base material layer 1 is composed of cellophane. Cellophane is obtained by reacting cellulose with carbon disulfide in the presence of alkali to obtain viscose, and then neutralizing and regenerating it into cellulose. As the cellophane used for the base material layer 1, a film-shaped cellophane usually produced as cellophane can be used as it is.

[Moisture-proof layer]
The moisture-proof layer 3 is a layer for preventing moisture such as dew condensation from coming into contact with the base material layer 1. Therefore, it is more preferable that the moisture-proof layer 3 is arranged in the outermost layer. Examples of the moisture-proof layer 3 include polyamide-based resin, nitrified cotton-based resin, polyvinyl chloride-based resin, polyvinyl chloride-based resin, polyvinyl acetate-based resin, acrylic resin, urethane-based resin, and shelac.

The nitrified cotton-based resin refers to nitricized cotton (nitrocellulose) or a mixed resin of this and another resin. Examples of the polyvinyl chloride-based resin include polyvinyl chloride and the like, examples of the polyvinylidene chloride-based resin include polyvinylidene chloride and the like, and examples of the polyvinyl acetate-based resin include polyvinyl alcohol and polyvinyl acetate.
Among these, polyamide-based resins, nitrified cotton-based resins, polyvinylidene chloride-based resins and the like are preferable.

The total coating amount of the moisture-proof layer 3 provided on the label according to the present invention, 1.0 g / ^{m 2} or more is good, 1.5 g / ^{m 2} or more preferably, 2.0 g / ^{m 2} or more is more preferable. If it is less than 1.0 g / m ² , sufficient moisture resistance may not be imparted. On the other hand, the upper limit of the total coating amount is, 7.0 g / ^{m 2} C., preferably ^{6.5g / m 2, 5.0g / m} 2 is more preferable. If it is more than 7.0 g / m ² , some materials used are not biodegradable, and there is a risk that the biodegradability cannot be sufficiently guaranteed.

Further, as described above, the moisture-proof layer 3 provided on the label according to the present invention is provided with at least two layers, of which the coating amount of one layer is preferably 0.5 g / m ² or more, and 0.8 g / m. m ² or more is preferable, and 1.0 g / m ² or more is more preferable. If it is less than 0.5 g / m ² , sufficient moisture resistance may not be imparted. On the other hand, the upper limit of the coating amount of the first layer is, 5.0 g / ^{m 2} C., preferably ^{4.5g / m 2, 4.0g / m} 2 is more preferable. If it is more than 5.0 g / m ² , some materials used are not biodegradable, and there is a possibility that the biodegradability cannot be sufficiently guaranteed. Therefore, the coating amount of the remaining layer is an amount that satisfies both the total coating amount and the coating amount of the one layer.

Moisture permeability of each moistureproof layer of said, 2000g ^/ m 2 · 24h or less well, preferably not more than ^{1500g / m 2 · 24h, 1000g} / m 2 · 24h or less is more preferable. Larger than 2000g / m 2 · ^24h, moisture adhering to the label in condensation or the like permeates the inner layer, the water comes into contact swells the substrate layer 1, or cause wrinkles in the label, the substrate layer 1 and the other Delamination may occur between the layers.

[Adhesive layer]
The adhesive layer 2 is a layer provided to prevent the base material layer 1 from peeling off from the moisture-proof layer 3 and the printing layer 4.
As a component constituting such an adhesive layer 2, layers arranged on both sides of the adhesive layer 2 (for example, in FIG. 1, the base material layer 1 and the moisture-proof layer 3, the base material layer 1 and the printing layer 4) In consideration of the components constituting the above, components that generate adhesiveness to both layers or further enhance adhesiveness, for example, anchoring agents, primer agents, adhesives and the like are appropriately used.

The coating amount of the components constituting the adhesive layer 2 is preferably 0.2 g / m ² or more, preferably 0.3 g / m ² or more, and more preferably 0.5 g / m ² or more in each adhesive layer. .. If it is less than 0.2 g / m ² , sufficient adhesive performance may not be imparted. On the other hand, the upper limit of the coating amount, 1.0 g / ^{m 2} C., preferably ^{0.9g / m 2, 0.8g / m} 2 is more preferable. If it is more than 1.0 g / m ² , the material used is usually not biodegradable, so that biodegradability may not be sufficiently guaranteed.

[Print layer]
The printing layer 4 is a layer for displaying the contents of the container on which the label according to the present invention is attached, and is provided by using an ink composition for label printing, preferably using a gravure printing machine, a flexographic printing machine, or the like. Can be done.

The label printing ink composition is a composition composed of a colorant, a binder resin, a solvent and the like.
As this colorant, pigments such as various inorganic pigments and organic pigments generally used in the field of printing ink can be used.
Specific examples of inorganic pigments include colored pigments such as titanium oxide, antimony white, zinc sulfide, red iron oxide, antimony red, cadmium yellow, cobalt blue, navy blue, ultramarine, carbon black, titanium black, graphite, aluminum powder, and bronze powder. As extender pigments such as calcium carbonate, kaolin, clay, barium sulfate, aluminum hydroxide, and talc, and organic pigments, soluble azo pigments, insoluble azo pigments, azo lake pigments, condensed azo pigments, copper phthalocyanine pigments, condensed polycyclic pigments, etc. Can be mentioned.

As the binder resin, a polyamide resin, an acrylic resin, a urethane resin, or the like can be used. Further, the solvent can be selected in consideration of the solubility, drying property and the like of the binder resin.

In addition to the above-mentioned materials, various additives such as adhesive resins, plasticizers, waxes, pigment dispersants, antistatic agents, mold release agents, curing agents, and chelating agents are added to the label printing ink composition. Can be used.

When the printed layer 4 is arranged inside the moisture-proof layer 3, the moisture-proof layer 3 acts as a protective layer, which is more preferable.

[Manufacturing of labels]
The label according to the invention of the present application can be produced by a general method.
For example, as a method for manufacturing the label 10 shown in FIG. 1, an adhesive layer 2 is formed on one surface (outer surface side) of the base material layer 1 by coating or the like, and then a moisture-proof layer 3 is formed by coating or the like. To do. Further, the adhesive layer 2 is formed on the other surface (container side) of the base material layer 1 by coating or the like, then the printing layer 4 is formed, and the moisture-proof layer 3 is formed by coating or the like. With these, the label can be manufactured. The coating on both sides of the base material layer 1 may be performed separately or at the same time. Further, coating on both sides of the base material layer 1 may be performed alternately.

[Label characteristics]
The label according to the present invention needs to prevent moisture from coming into contact with the base material layer 1. Therefore, the moisture permeability of the label according to the present invention, 1000g ^/ m 2 · 24h or less well, preferably not more than ^{800g / m 2 · 24h, 500g} / m 2 · 24h or less is more preferable. Larger than 1000g / m 2 · ^24h, wrinkles may occur due to dew condensation on the label surface, the appearance is likely to have a problem arises that it becomes worse.

[Attachment of label to container]
The label according to the present invention is used by being attached to a container. This will be described with reference to the label 10 shown in FIG.
When covering a part of the side wall of the container, the label 10 is cut to a predetermined size, and one surface of the label 10 which is in contact with the container (hereinafter, simply referred to as "contact surface"). ), Specifically, in FIG. 1, an adhesive (or adhesive) is applied to the surface of the base material layer 1 on which the print layer 4 is formed, and this is applied to a part of the side wall of the container. It can be done by sticking to.

When covering the entire circumference of the side wall of the container, a method of covering the entire circumference of the side wall of the container with a label cut according to the length of the entire circumference of the side wall of one container or a roll-shaped label (roll label) is used as the label 10. There is a way to cover it. In the former, of the labels coated with an adhesive (or adhesive) on both side ends of the contact surface, one side end is attached to the side wall of the container, and then the label 10 is attached to the side wall of the container. The label 10 is attached so as to cover the side wall portion of the container by wrapping the label around the portion and attaching the other side end portion on one side end portion of the label attached to the side wall portion of the container. be able to. In the latter case, an adhesive (or adhesive) is applied to one side end of the contact surface of the roll label, the side end is attached to the side wall of the container, and then the roll label is applied to the container. The label is cut so that the roll label overlaps one side end of the roll label that is wrapped around the side wall and attached to the side wall of the container, and the contact surface of the cut label is cut. An adhesive (or adhesive) is applied to the side end portion, and this side end portion is attached on one side end portion of the label. As a result, the label can be attached so as to cover the side wall portion of the container.

[Use of label]
As described above, the label according to the present invention prevents the base material layer from coming into contact with moisture, so that even if the base material comes into contact with the label due to dew condensation or the like, the label may wrinkle or the base material layer and the printing layer may be wrinkled. It is possible to suppress the occurrence of delamination between and. From this point of view, it can be effectively used as a label for containers such as beverages and foods, for example, bottles, bottles, cases, etc., which may be transported or stored frozen or refrigerated.

Examples of carrying out the present invention will be specifically described. First, the materials used and the measuring method will be described.

<Raw materials>
[Base material layer]
-Ordinary cellophane ... Made by Rengo Co., Ltd .: PT # 400 (t = 27 μm) (hereinafter referred to as "PT # 400")
[Adhesive layer]
-Anchor agent: manufactured by Toyo Morton Co., Ltd .: Anchor agent AD-335AE (hereinafter referred to as "AD335AE")
-Primer agent: Manufactured by Dainichiseika Kogyo Co., Ltd .: Primer agent CSUP (NS-1) medium (hereinafter referred to as "CSUP")

[Print layer]
-Urethane-based colored paint: Made by Sakata Inx Corporation: Urethane-based colored paint Bell Color (hereinafter referred to as "Bell Color")

[Moisture-proof layer]
-Polyamide-based colorless and transparent paint: Made by Sakata Inks Co., Ltd .: Polyamide-based colorless and transparent paint NT-2000, scratch-preventive varnish RE-600 (hereinafter referred to as "no polyamide")
-Nitrocellulose-based colorless and transparent paint ... Made by Sakata Inks Co., Ltd .: Nitrocellulose-based colorless and transparent paint XGS-4510OP Varnish Kai 2 (hereinafter referred to as "nitrified cotton")

-Polyamide-based white paint: Made by Sakata Inx Corporation: Polyamide-based white paint NT-2000 White 115 (hereinafter referred to as "Polyamide White 1")
-Polyamide-based white paint: Made by Toyo Ink Co., Ltd .: Polyamide-based white paint PANNECO White (hereinafter referred to as "Polyamide White 2")

-Polychlorinated biphenyl transparent paint ... Asahi Kasei Co., Ltd .: Polychlorinated biphenyl transparent paint L509 (hereinafter referred to as "PVDC")
-Urethane-based white paint: Made by Sakata Inx Corporation: Urethane-based white paint XGS-5804 White 130 NT (hereinafter referred to as "urethane")

<Evaluation method>
[Appearance, moisture-proof layer adhesion, ink adhesion]
The label was wrapped around a PET bottle, left in a 5 ° C environment for 3 hours, and then left in a 35 ° C / 80% RH environment for 30 minutes, and then the following items were confirmed.

(appearance)
The occurrence of wrinkles on the label was visually confirmed. If there were no wrinkles, it was marked as "○", if there were wrinkles on a part of the label, it was marked as "△", and if there were wrinkles on the entire label, it was marked as "×".

(Adhesion to moisture-proof layer)
Cellophane tape was attached on the label and crimped 5 times with a finger. After crimping, peel off the cellophane tape, "○" if the moisture-proof layer does not adhere to the cellophane tape, "△" if the moisture-proof layer adheres to the cellophane tape at 20% or less of the area attached, 21% of the area attached to the cellophane tape When the moisture-proof layer adhered to the above, it was marked with "x".

(Ink adhesion)
In the label manufacturing process, general-purpose ink (manufactured by Sakata Inks Co., Ltd .: Bell Color) is applied and dried on the cellophane base material layer or adhesive layer on the label container side with a hand pull fur, and then various moisture-proof layers are applied on the ink layer. The layer was painted. Cellophane tape was attached on the moisture-proof layer on the container side and crimped 5 times with a finger.
After crimping, peel off the cellophane tape, "○" if the ink does not adhere to the cellophane tape, "△" if the ink adheres to the cellophane tape at 20% or less of the sticking area, and 21% or more of the sticking area to the cellophane tape. When the ink adhered, it was marked with "x".

[Biodegradability]
The evaluation was made by the ratio of the mass of the base material layer (cellophane) to the total mass of all the layers constituting the label. Those with a ratio of 91% or more are "5", those with a ratio of 90% or less and 81% or more are "4", those with a ratio of 80% or less and 71% or more are "3", and those with a ratio of 70% or less and 61% or more are "2". , 60% or less was set as "1".

(Examples 1 to 15, Comparative Examples 1 to 5)
Labels were prepared by applying each component shown in Tables 1, 2 and 3 to both sides of the base material layer with the coating amount shown in Tables 1, 2 and 3.
Each evaluation was performed using the obtained label. The results are shown in Tables 1, 2 and 3.

1 Base material layer 2 Adhesive layer 3 Moisture-proof layer 4 Printing layer 10 Label

Claims (4)

A label characterized by having a moisture-proof layer on both sides of a base material layer made of cellophane via an adhesive layer. The label according to claim 1, wherein the moisture-proof layer is a layer containing at least one selected from a polyamide resin, a nitrocellulose resin, and a polyvinylidene chloride resin. Label according to claim 1 or 2 moisture permeability is equal to or less than 1000g ^/ m 2 · 24h. The label according to any one of claims 1 to 3, wherein the total coating amount of the moisture-proof layer is 1.0 g / m ² or more and 7.0 g / m ² or less.

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