JP7264668B2 - label - Google Patents

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 to indicate the contents. Examples of this label include a label that is attached to the container with an adhesive or the like, a label that is adhered by winding a heat-shrinkable film around the body of the container and heat-shrinking it (Patent Document 1), and a film that constitutes the label. A known label is wrapped around the body of a container by adhering one end to the body of the container, encircling 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, from an environmental point of view, the problem of disposal of petroleum products has been pointed out. For example, plastic labels and containers are often discarded after use, and their disposal can be problematic. Specifically, polyolefin-based resins, polyethylene terephthalate (PET), and the like are used as packaging plastics. It is conceivable to landfill them, but due to their chemical and biological stability, they hardly decompose and remain, resulting in problems such as shortening the life of landfills. Furthermore, when these are dumped into the sea, they are chemically and biologically stable, so they are finely divided and float in the sea, 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. As a label using cellophane, there is a label described in Patent Document 3.

JP 2012-032657 A Japanese Patent Application Laid-Open No. 2007-108307 JP 2018-047926 A

However, although the label described in Patent Document 3 uses cellophane, polyolefin resin or the like is used as the base material. Therefore, it is difficult to say that the problem of the load on the environment has been solved. The reason why cellophane is used in Patent Document 3 is that when moisture adheres to the surface of the label, it is absorbed by the cellophane layer to prevent condensation from occurring.

SUMMARY OF THE INVENTION Accordingly, the present invention provides a label that has a low environmental load by mainly using a material that biodegrades in the environment, thereby reducing the amount of garbage and reducing the impact on the ecosystem in the sea. With the goal.

As a result of investigations by the present inventors, the present inventors have found that the above problems can be solved by using biodegradable cellophane as the substrate layer of the label, and have completed the present invention.
That is, the gist of the present invention is as follows.

[1] A label characterized by having moisture-proof layers on both sides of a substrate 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 polyamide-based resins, nitrocellulose-based resins, and polyvinylidene chloride-based resins.
[3] The label according to [1] or [2], which has a moisture permeability of 1000 g/m ² ·24 h or less.
[4] The moisture-proof layer 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 is biodegradable and easily decomposed in the environment, thereby reducing the burden on the environment.
In addition, since a 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 due to swelling of the base material layer are prevented. , the occurrence of delamination between the substrate layer and the printed layer can be suppressed.
Furthermore, since the adhesive layer is provided between the base layer and the moisture-proof layer, the adhesion between the base layer and the moisture-proof layer can be improved, and delamination can be further suppressed.

Sectional view showing an example of a label according to the present invention

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described with reference to embodiments.
This invention relates to a label characterized by having moisture-proof layers on both sides of a substrate layer via an adhesive layer.

As an example of the label according to the present invention, the label shown in FIG. 1 can be mentioned. In the label 10 shown in FIG. 1, a moisture-proof layer 3 is provided on the surface of the base layer 1 facing the outside air with an adhesive layer 2 interposed therebetween. A printed layer 4 and a moisture-proof layer 3 are provided on the container-side surface of the base material layer 1 with an adhesive layer 2 interposed therebetween.
The printed layer 4 is formed between the adhesive layer 2 and the moisture-proof layer 3 on the container side of the substrate layer 1 in FIG. 1, but is not necessarily limited to this position. 1 may be formed between the adhesive layer 2 and the moisture-proof layer 3 on the outside air side.

[Base material layer]
The substrate layer 1 is made of cellophane. Cellophane is obtained by reacting cellulose with carbon disulfide in the presence of alkali to obtain viscose, which is then neutralized to regenerate cellulose. As the cellophane used for the substrate layer 1, a film-shaped cellophane that is normally 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 contacting the base material layer 1 . For this reason, the moisture-proof layer 3 is more preferably arranged as the outermost layer. Examples of the moisture-proof layer 3 include polyamide-based resins, nitrocellulose-based resins, polyvinyl chloride-based resins, polyvinylidene chloride-based resins, polyvinyl acetate-based resins, acrylic-based resins, urethane-based resins, and shellac.

The nitrocellulose-based resin refers to nitrocellulose (nitrocellulose) or a mixed resin of nitrocellulose and other resins. Polyvinyl chloride resins include polyvinyl chloride, polyvinylidene chloride resins include polyvinylidene chloride, and polyvinyl acetate resins include polyvinyl alcohol and polyvinyl acetate.
Among these, polyamide-based resins, nitrocellulose-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 is preferably 1.0 g/m ² or more, preferably 1.5 g/m ² or more, and more preferably 2.0 g/m ² or more. If it is less than 1.0 g/m ² , it may not be possible to impart sufficient moisture resistance. On the other hand, the upper limit of the total coating amount is preferably 7.0 g/m ² , preferably 6.5 g/m ² , more preferably 5.0 g/m ² . If it is more than 7.0 g/m ² , some of the materials used are not biodegradable, and biodegradability may not be ensured sufficiently.

As described above, the moisture-proof layer 3 provided on the label according to the present invention is provided with at least ^two layers. 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 for one layer is preferably 5.0 g/m ² , preferably 4.5 g/m ² , more preferably 4.0 g/m ² . If it is more than 5.0 g/m ² , some of the materials used are not biodegradable, and biodegradability may not be ensured sufficiently. Therefore, the coating amount of the remaining layers is an amount that satisfies both the conditions of the total coating amount and the coating amount of one layer.

The moisture permeability of each moisture-proof layer is preferably 2000 g/m ² ·24h or less, preferably 1500 g/m ² ·24h or less, more preferably 1000 g/m ² ·24h or less. If it is greater than 2000 g/m ² ·24 h, the moisture adhering to the label due to dew condensation or the like seeps into the inside of the layer, and the moisture comes into contact with the base material layer 1 and swells, causing wrinkles in the label, and the base material layer 1 and other layers. Delamination may occur between the layers.

[Adhesion layer]
The adhesive layer 2 is a layer provided to prevent the substrate layer 1 from peeling off from the moisture-proof layer 3 and the printed layer 4 .
Components constituting such an adhesive layer 2 include layers arranged on both sides of the adhesive layer 2 (for example, in FIG. 1, the base layer 1 and the moisture-proof layer 3, the base layer 1 and the printing layer 4) Considering the components constituting the above, a component that produces adhesion to both layers or further enhances adhesiveness, such as an anchor agent, a primer agent, an adhesive, etc., is 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 , there is a possibility that sufficient adhesion performance cannot be imparted. On the other hand, the upper limit of the coating amount is preferably 1.0 g/m ² , preferably 0.9 g/m ² , more preferably 0.8 g/m ² . If the amount is more than 1.0 g/m ² , the material used is usually not biodegradable, and biodegradability may not be ensured sufficiently.

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

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

Polyamide resins, acrylic resins, urethane resins, and the like can be used as the binder resin. Moreover, the solvent can be selected in consideration of the solubility and drying property of the binder resin.

In addition to the above materials, the label printing ink composition contains various additives such as adhesive resins, plasticizers, waxes, pigment dispersants, antistatic agents, release agents, curing agents, and chelating agents. can be used.

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

[Label production]
The label according to the invention of the present application can be manufactured by a general method.
For example, as a method of manufacturing the label 10 shown in FIG. do. Also, the adhesive layer 2 is formed on the other surface (container side) of the substrate layer 1 by coating or the like, then the printed layer 4 is formed, and then the moisture-proof layer 3 is formed by coating or the like. Labels can be produced from these. In addition, the coating on both sides of the substrate layer 1 may be performed separately, or may be performed at the same time. Further, the coating on both sides of the substrate layer 1 may be alternately performed.

[Label characteristics]
The label according to the present invention needs to protect the substrate layer 1 from contact with moisture. Therefore, the moisture permeability of the label according to the present invention is preferably 1000 g/m ² ·24h or less, preferably 800 g/m ² ·24h or less, more preferably 500 g/m ² ·24h or less. If it is more than 1000 g/m ² ·24 h, wrinkles may occur due to dew condensation on the label surface, resulting in a problem of poor appearance.

[Attaching the label to the container]
A label according to the present invention is used by being attached to a container. This will be explained using the label 10 shown in FIG.
In the case of covering part of the side wall of the container, the label 10 is cut into a predetermined size, and one surface of the label 10 that comes into contact with the container (hereinafter simply referred to as "contact surface") is cut. ), specifically in FIG. 1, an adhesive (or pressure-sensitive adhesive) is applied to the surface on which the printed layer 4 is formed when viewed from the substrate layer 1, 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 label cut to match the length of the entire circumference of the side wall of one container is used as the label 10, or a roll label (roll label) is used. There is a method of covering In the former, one side edge of the label coated with an adhesive (or pressure-sensitive adhesive) on both side edges of the contact surface 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 mounted over the container side wall by wrapping it around a portion of the label 10 and sticking one side end of the label on top of the other side end of the label stuck to the container side wall. be able to. In the latter method, an adhesive (or pressure-sensitive adhesive) is applied to one side edge of the contact surface of the roll label, this side edge is attached to the side wall of the container, and then the roll label is attached to the container. The label is cut so that the roll label overlaps one side end of the roll label wrapped around the side wall and stuck to the side wall of the container, and the contact surface of the cut label is cut. Adhesive (or adhesive) is applied to the side edge and this side edge is adhered onto one side edge of the label. Thereby, the label can be attached so as to cover the side wall of the container.

[Use of label]
As described above, the label according to the present invention prevents the base layer from coming into contact with water. It is possible to suppress the occurrence of delamination between From this point of view, it can be effectively used as a label for containers of beverages, foods, etc., such as bottles, bottles, cases, etc., which may be transported or stored frozen or refrigerated.

Embodiments embodying the present invention will be specifically described. First, the materials and measurement methods used will be described.

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

[Print layer]
・Urethane-based colored paint: Sakata Inx Co., Ltd.: Urethane-based colored paint Bellcolor (hereinafter referred to as “Bellcolor”)

[Moisture-proof layer]
・ Polyamide-based colorless transparent paint: manufactured by Sakata Inx Co., Ltd.: polyamide-based colorless transparent paint NT-2000, scratch-resistant varnish RE-600 (hereinafter referred to as "no polyamide")
・Nitrated cotton-based colorless transparent paint: Sakata Inx Co., Ltd.: Nitrated cotton-based colorless transparent paint XGS-4510OP Varnish Kai 2 (hereinafter referred to as “nitrated cotton”)

· Polyamide-based white paint ... Sakata Inx Co., Ltd.: Polyamide-based white paint NT-2000 White 115 (hereinafter referred to as "polyamide white 1".)
・Polyamide white paint: manufactured by Toyo Ink Co., Ltd.: Polyamide white paint PANNECO White (hereinafter referred to as “polyamide white 2”)

· Polyvinidene chloride-based transparent paint: Asahi Kasei Corp.: Polyvinidene chloride-based transparent paint L509 (hereinafter referred to as "PVDC")
・Urethane-based white paint: Sakata Inx Co., Ltd.: 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, then left in a 35° C./80% RH environment for 30 minutes, and the following items were checked.

(exterior)
The occurrence of wrinkles on the label was visually confirmed. If there were no wrinkles, it was rated as "◯"; if the label was partially wrinkled, it was rated as "Δ";

(Moisture-proof layer adhesion)
A cellophane tape was pasted on the label and pressed five times with fingers. Peel off the cellophane tape after crimping, and if the moisture-proof layer does not adhere to the cellophane tape, mark "○". If the moisture-proof layer adhered as described above, it was evaluated as "x".

(Ink adhesion)
In the label manufacturing process, general-purpose ink (Sakata Inks Co., Ltd.: Belcolor) is applied with a hand proofer onto the cellophane base layer or adhesive layer on the container side of the label. A layer was applied. A cellophane tape was attached to the moisture-proof layer on the container side and crimped five times with fingers.
If the cellophane tape is peeled off after crimping and the ink does not adhere to the cellophane tape, "○" is given. When the ink adhered, it was marked as "x".

[Biodegradability]
The ratio of the mass of the substrate layer (cellophane) to the total mass of all layers constituting the label was evaluated. "5" if the ratio is 91% or more, "4" if 90% or less and 81% or more, "3" if 80% or less and 71% or more, "2" if 70% or less and 61% or more , 60% or less was set as "1".

(Examples 1 to 12 , Comparative Examples 1 to 8 )
Each component shown in Tables 1, 2 and 3 was coated on both sides of the substrate layer in the amount shown in Tables 1, 2 and 3 to prepare a label.
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 printed layer 10 label

Claims (1)

Moisture-proof layers are provided on both sides of a base layer made of cellophane via an adhesive layer,
The moisture-proof layer is a layer containing at least one selected from polyamide-based resins, nitrocellulose-based resins, and polyvinylidene chloride-based resins,
Moisture permeability is 1000 g / m ² · 24 h or less,
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,
A label, wherein the coating amount of the adhesive layer is 0.2 g/m ² or more and 1.0 g/m ² or less in each adhesive layer .

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