JP2010076790A - Container label - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a container label which is improved so that the inside of a bag where a carrying grip and a container are accommodated does not get wet by dew drops generated on the outer surface of the container label and the outer surface of the container after they are extracted from the bag when they are cooled. <P>SOLUTION: The container label has a thermal shrinkability used for covering and wrapping a container, such as a plastic bottle, a glass container, a can, a cup. The container label is formed by laminating at least a water absorbing layer formed with a coating material containing water absorbing polymer particles and a thermal shrinkable film layer. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a container label having heat shrinkability or stretchability used for covering and packaging containers such as plastic bottles, bottles, cans and cups used as containers for soft drinks, taste drinks, foods, seasonings and the like.

  Many containers that sell beverages such as soft drinks and coffee drinks are provided with a heat-shrinkable label attached to the container body. Examples of containers include plastic bottles for soft drinks and plastic cups for coffee drinks. These labeled containers are often eaten or eaten in a cooled state in a refrigerator or the like. However, when the container is taken out at the time of use, there is a problem that condensation rapidly occurs on the outer surface of the cooled container label or the outer surface of the container, and when the hand is wet or moved in the bag, the bag is wetted. This problem is particularly noticeable in hot and humid places.

  As a method for preventing such wetting, Patent Document 1 proposes a container label in which a heat-shrinkable film layer and an olefin-based foamed resin are laminated in order to impart heat insulation to the label. However, with an olefin-based foamed resin, the expansion ratio is not high, so it is difficult to completely prevent condensation.

Patent Documents 2 and 3 propose container labels that absorb dew condensation by laminating a nonwoven fabric layer on a heat-shrinkable film layer. Although this method can absorb dew condensation, in order to prevent the end of the nonwoven fabric from being visible after the label is contracted and wound around the container, the nonwoven fabric is laminated so that one end of the nonwoven fabric is shorter than the heat shrink film. However, in this specification, since the nonwoven fabric divided in the width direction is simultaneously laminated on one heat shrink film in the laminating process, it is difficult to control the supplied nonwoven fabric.
JP 2001-1254889 A JP 2005-55490 A JP-A-2005-70739

  It is an object of the present invention to provide an improved container label that prevents the inside of a bag containing a handle or a container from getting wet due to condensation occurring on the outer surface of the container label or the outer surface of the container after being taken out in a cooled state. And

  The invention of claim 1 of the present invention is a container label having heat-shrinkability used for covering and packaging containers such as plastic bottles, bottles, cans, cups, etc., and at least a coating agent containing water-absorbing polymer particles. The container label is characterized in that a water-absorbing layer and a heat-shrinkable film layer formed in this manner are laminated.

  The invention according to claim 2 of the present invention is characterized in that a printing layer is further laminated on a water-absorbing layer formed of a coating agent containing water-absorbing polymer particles and a heat-shrinkable film layer. It is.

According to a third aspect of the present invention, the water-absorbing layer is a water-absorbing layer obtained by applying a coating agent containing water-absorbing polymer particles to the entire surface of the heat-shrinkable film layer or the printing layer. The container label according to 1 or 2.

  The invention of claim 4 of the present invention is characterized in that the water-absorbing layer is a water-absorbing layer obtained by pattern-coating a coating agent containing water-absorbing polymer particles on a partial region of the heat-shrinkable film layer or the printing layer. The container label according to claim 1 or 2.

  According to the container label of the present invention, since a water-absorbing layer formed of a coating agent containing water-absorbing polymer particles and a heat-shrinkable film are laminated, a laminate as in the case of laminating a nonwoven fabric is unnecessary. Thus, a container label that can effectively prevent condensation is obtained.

  According to the container label of the present invention, product information and design can be added by further laminating a printing layer on a water-absorbing layer and a heat-shrinkable film layer formed of a coating agent containing water-absorbing polymer particles.

  The water absorbing layer of the container label of the present invention may be formed by coating the entire surface of the heat-shrinkable film or by pattern coating. In the case of full-surface coating, there is an advantage that the processing process is simplified because there is no limitation on the coating method and there is no need to prepare a pattern plate, but for pattern reasons, pattern coating is performed by gravure printing, for example. Is also possible. In the case of pattern coating, in order to maintain the effect of preventing dew condensation, a pattern constituted by repeating a certain pattern such as a lattice pattern or a checkered pattern is desirable.

  Since the label of the present invention can absorb the condensation formed on the outer surface of the container label and the outer surface of the container after being taken out in the cold state, the inside of the bag containing the handle and the container gets wet. Can be prevented.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

  FIG. 1 is a schematic sectional view showing an example of the container label of the present invention, FIG. 2 is a perspective view showing an example of the container label of the present invention, and FIG. 3 is a coating pattern of the coating agent for the container label of the present invention. FIG. 4 is a front view showing an example in which the container label of the present invention is in close contact with the container.

  The container label of the present invention has a cylindrical shape as shown in FIG. 2 (6) or a bag shape as shown in FIG. 2 (7), and the layer cross section is a heat-shrinkable film as shown in FIG. It consists of a layer (3), a printing layer (4), and a water absorption layer (5). First, after printing on the heat-shrinkable film layer, a coating agent in which water-absorbing polymer particles and a resin are stirred and dispersed is applied. Then, it is processed into a cylindrical shape or a bag shape in the process.

  As the heat-shrinkable film layer of the container label of the present invention, the material is not particularly limited. For example, a polyester resin such as polyethylene terephthalate, an olefin resin such as polypropylene, and a styrene resin such as a styrene-butadiene copolymer, Examples thereof include a heat-shrinkable film made of a thermoplastic resin such as a cyclic olefin resin and a vinyl chloride resin, a heat shrinkable film made of a mixture of two or more kinds, and a laminated film thereof.

  The printed layer of the container label of the present invention is processed by a method such as gravure printing on the back surface of the heat-shrinkable film (see FIG. 1: label inner surface side) using commodity printing information and design.

  The water-absorbing layer of the container label of the present invention is formed by applying a coating agent in which water-absorbing polymer particles and a film-forming resin are stirred and dispersed.

  The water-absorbing polymer particles used in the coating agent for the water-absorbing layer of the container label of the present invention include starch polymer, cellulose polymer, hyaluronic acid polymer, polyvinyl alcohol polymer, acrylate polymer, acrylamide polymer and the like. Can be mentioned.

The preferred amount of the water-absorbing polymer particles is set to 100 parts by weight or more and 1000 parts by weight or less for the water-absorbing polymer particles with respect to 100 parts by weight of the film-forming resin. If the amount of water-absorbing polymer particles used is less than 100 parts by weight, the water absorption effect is insufficient, and if the amount used exceeds 1000 parts by weight, the coating properties and printability are insufficient.

  As the film-forming resin used in the coating agent for the water-absorbing layer of the container label of the present invention, resins used in ordinary inks can be used. For example, cellulose resin, acrylic resin, acrylic polyol resin, urethane resin, styrene-acrylic acid resin, styrene-maleic acid resin, rosin-maleic acid resin and the like can be mentioned. Among these, the cellulose resin is not particularly limited, and examples thereof include nitrified cotton, cellulose acetate, cellulose acetate propionate, cellulose acetate butyrate, methylcellulose, ethylcellulose, ethylhydroxyethylcellulose, hydroxyethylcellulose, carboxymethylcellulose, and mixtures thereof. be able to.

  The acrylic resin is not particularly limited. For example, acrylic acid esters such as methyl acrylate, ethyl acrylate, and butyl acrylate, homopolymers of methacrylic acid esters such as methyl methacrylate, ethyl methacrylate, and butyl methacrylate, acrylic Examples thereof include a copolymer of an acid ester and a methacrylic acid ester, an acrylic acid ester, a copolymer of a methacrylic acid ester and styrene, vinyl toluene, acrylamide, acrylic acid, methacrylic acid, and the like.

  There is no restriction | limiting in particular also as acrylic polyol resin, For example, the copolymer etc. of said acrylic acid ester, methacrylic acid ester, etc., acrylic acid hydroxyethyl, N-methylol acrylamide, etc. can be mentioned.

  The urethane resin is not particularly limited, and examples thereof include polyurethane resins and polyurethane urea resins obtained from diisocyanate and polyester polyol, polyether polyol, acrylic polyol, and the like.

  The styrene-maleic acid resin is not particularly limited, and examples thereof include a styrene-maleic anhydride copolymer and an esterified resin in which a styrene-maleic anhydride copolymer is partially esterified to lower the acid value. .

  The rosin-maleic acid resin is not particularly limited, and examples thereof include a resin obtained by adding maleic anhydride to rosin, and a resin obtained by partially esterifying this resin with a polyol.

  As the film-forming resin used in the coating agent for the water-absorbing layer of the container label of the present invention, other known resins can be further contained. Examples of such a resin include a coumarone resin, a ketone resin, a polyvinyl butyral resin, an epoxy resin, a polyester resin, and an alkyd resin.

  The solvent of the film-forming resin used in the coating agent for the water-absorbing layer of the container label of the present invention is not particularly limited. For example, alcohols such as methanol and ethanol, acetates such as ethyl acetate and butyl acetate, acetone and methyl ethyl ketone , Ketones such as methyl isobutyl ketone, and hydrocarbon solvents such as n-hexane and toluene.

The film-forming resin is dissolved in the solvent and used, and the concentration is usually 10 to 50% by weight. If the concentration is less than 10% by weight, it is insufficient in terms of physical properties of the coating film, while if it exceeds 50% by weight, it is insufficient in terms of coating suitability.
Although the water absorption layer coating method in the present invention is not particularly limited, a gravure method, a roll coating method or the like is used. The coating amount is preferably as large within a range capable of maintaining the suitability as a container label, but, 1 g / m ² or more preferably in a dry state.

  In addition, the coating agent of a water absorption layer is applied with the whole film surface or a specific pattern. As an example of a specific pattern, as shown in FIG. 3, the pattern etc. which apply | coating intermittently at a lattice pattern or a fixed interval are mentioned.

  The form of the container label of the present invention is a label used for mounting on the trunk of a container of food or the like to be refrigerated, and is formed in a cylindrical shape or a bag shape as shown in FIG. Such a label is obtained by cutting a film or sheet having the above-mentioned layer structure into an appropriate size, and using an adhesive or a solvent to back seal (8) or back seal (9) and bottom seal (10). It can be formed in a cylindrical shape or a bag shape.

  Hereinafter, an embodiment of the present invention will be specifically described.

<Example 1>
<Creation of water-absorbing layer coating agent>
(1) Dissolve butyl acrylate (film forming resin) in ethyl acetate to make an ethyl acetate solution with a concentration of 40%.
(2) Sodium polyacrylate (water-absorbing polymer) is added at a ratio of 250 parts by weight to 200 parts by weight of the 40% ethyl acetate solution, and these are stirred and mixed to obtain a coating agent.

<Creation of container label>
The film for labeling was obtained by carrying out gravure printing on the back surface (label inner surface) of a heat-shrinkable polyethylene terephthalate film (thickness 30 micrometers), and also coating the said water absorbing layer coating agent 3g / m < ² > on the printing surface. This label film was processed into a cylindrical shape as shown in FIG. 2 (6) to obtain a container label having a length of 200 mm and a width of 300 mm.

  This container label was inserted into a 2 L-capacity plastic bottle container, and it was heat-shrinked by applying hot air (temperature 80 ° C.) and brought into close contact with the container. FIG. 4 shows the state of close contact. The labeled container thus obtained was filled with water, stored in the refrigerator (4 ° C) for 1 day, and then left outside (temperature 25 ° C, humidity 75%) for 10 minutes. Condensation was observed on the label surface. I couldn't.

  As a result, the container label of the present invention can absorb the condensation formed on the outer surface of the container label and the outer surface of the container after being taken out in a cooled state. It was confirmed that the inside could be prevented from getting wet.

Cross-sectional schematic diagram showing an example of the container label of the present invention The perspective view which shows an example of the container label of this invention In the plan view showing an example of the coating agent coating pattern of the container label of the present invention An orthographic view showing an example in which the container label of the present invention is brought into close contact with the container.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Label 2 ... Label 3 ... Heat-shrinkable film layer 4 ... Printing layer 5 ... Water absorption layer 6 ... Cylindrical label 7 ... Bag-shaped label 8 ... Back seal 9 ... Back seal 10 ... Lower layer seal 11 ... Coating agent 12 ... Film Surface or printing surface 13 ... Coating agent 14 ... Film surface or printing surface 15 ... Container 16 ... Label after adhesion

Claims (4)

  A heat-shrinkable container label used for coating and packaging containers such as plastic bottles, bottles, cans, cups, etc., and at least a water-absorbing layer and a heat-shrinkable film formed with a coating agent containing water-absorbing polymer particles A container label, wherein the layers are laminated.   The container label according to claim 1, wherein a printing layer is further laminated on a water-absorbing layer and a heat-shrinkable film layer formed of a coating agent containing water-absorbing polymer particles.   The container label according to claim 1 or 2, wherein the water-absorbing layer is a water-absorbing layer obtained by applying a coating agent containing water-absorbing polymer particles to the entire surface of the heat-shrinkable film layer or the printing layer.   The container according to claim 1 or 2, wherein the water-absorbing layer is a water-absorbing layer obtained by pattern-coating a coating agent containing water-absorbing polymer particles on a partial region of the heat-shrinkable film layer or the printing layer. label.

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