JPH09179496A - Tack label and labeled container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tack label excellent in appearance without the generation of blister caused by wrinkles and air bubbles in being stuck to a container formed of polyolefine group material such as polyethylene or polypropylene immediately after forming by providing an adhesive layer of the tack label, formed of base material and the adhesive layer, with groove-like air vents with one ends opened at a label end part. SOLUTION: An adhesive layer provided at label base material is provided with groove-like air vents 2 with at least one ends opened at a label end part. Wrinkles and air bubbles generated with the lapse of time are thereby improved so as to be able to stick a label immediately after forming. That is, air bubbles existing between a plastic container and a label 1 at the time of sticking the label 1 are discharged outside of the label 1 through the groove-like air vents 2 so as to be able to prevent the generation of blister caused by air bubbles. Wrinkles generated at the time of sticking the label are also absorbed by the groove-like air vents 2 so as to be able to prevent the generation of wrinkles.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tack label to be attached to a plastic container and a labeled plastic container to which the label is attached, and more specifically to a plastic container, particularly a polyolefin-based plastic container. The present invention relates to a tack label having excellent appearance characteristics and high practical value, which sometimes does not cause blisters due to wrinkles and bubbles.

[0002]

2. Description of the Related Art Affixing a label for displaying contents on a plastic hollow container has an important meaning in packaging technology because it enhances the commercial value of packaging products and motivates consumers to purchase. ing. One of them is sticking a tack label as a method of decorating a plastic bottle with a polyolefin material. Various types of tack labels have been known as conventional tack labels to be attached to the surface of a plastic container, but all of them have an adhesive layer provided on the entire surface of a label base material.

[0003]

In a label having an adhesive layer provided on the entire surface of these label substrates, air present in fine irregularities on the surface of the container at the time of sticking to the container or the container immediately after molding Volatile components and the like generated by themselves tend to cause blisters due to wrinkles and air bubbles, impair the aesthetics of the product to which the label is attached, and significantly reduce the commercial value thereof. In particular, after forming a plastic bottle, if a label is attached within 2 hours after the bottle is formed due to the generation of volatile components from the bottle, there is a problem that wrinkles or bubbles are generated over time, resulting in poor appearance. Among them, polyolefin-based plastic containers used as bottles for shampoo, rinse, detergent, etc. are more likely to have fine irregularities on the container surface than other plastic containers, and due to the characteristics of the material, wrinkles and wrinkles can be created during label application. Blistering due to bubbles is likely to occur, and improvement has been required.

Therefore, an object of the present invention is to provide a plastic container, and particularly a polyolefin resin such as polyethylene or polypropylene immediately after being molded, which has an excellent appearance and is of practical value which does not cause blistering due to wrinkles or bubbles. It is to provide a high tack label and a plastic container to which the label is attached.

[0005]

In the present invention, at least one end of the adhesive layer is provided on a label base material in order to release volatile components generated from the container from the interface between the container and the label. By providing a groove-shaped air vent that is open at, wrinkles and bubbles are improved over time, it becomes possible to label immediately after molding, and it is possible to solve the problems with the conventional tack label. is there. In the tack label of the present invention, air bubbles existing between the plastic container and the label at the time of sticking the label are discharged to the outside of the label through the groove-shaped air vent, so that the generation of blisters due to the air bubbles can be prevented. Further, the wrinkles that occur when the label is attached are also absorbed by the groove-shaped air vents, and it is possible to prevent them from occurring.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the tack label of the present invention, the groove-shaped air vent provided in the adhesive layer may have any shape as long as at least one end thereof is opened at the label end. However, the groove is usually a straight groove whose both ends are open at the label end (FIG. 1) or a groove provided in a grid pattern (FIG. 2) for easy groove formation. In the case of a linear groove, the groove is vertical with respect to the label,
Horizontal, it may be provided obliquely what positional relation, also, one end of which may as not reached until the label edge (Figure 3). When the air vents are provided in a lattice pattern, the ends of the groove may be entirely open at the label end, or a part thereof may not reach the label end. Further, it is not always necessary to form an orthogonal grid, and the structure may be diagonally crossed, but normally, due to the ease of the groove structure, an orthogonal grid in which all the ends of the groove are released at the label end. Shaped groove.

The groove provided in the adhesive layer may reach the label substrate as shown in FIG. 4, or may be formed in the middle of the adhesive layer as shown in FIG. The depth of the groove is 5 to 50 μm, preferably 10 to 30 μm. If it is less than 5 μm, it becomes difficult to discharge bubbles, and
Wrinkles cannot be prevented. The width of the groove is usually 0.1
It is preferably 1 mm, particularly 0.2 to 0.5 mm. If the width of the groove is less than 0.1 mm, it will be difficult to discharge bubbles, and
If it exceeds mm, the presence of grooves becomes remarkable, resulting in a disadvantage of poor appearance. The distance between the grooves is appropriately selected according to the use of the label, the type of label base material or adhesive used, and the layer thickness, but is usually 0.1 to 1 mm, and particularly preferably 0.2 to 0.5 mm. .

[0008] The surface of the adhesive layer is usually covered with a backing sheet having releasability to form a tack label. At that time, as shown in FIG. 6, if a linear or lattice-shaped convex strip is provided on the surface of the mount which is to be adhered to the adhesive layer, the adhesive layer having a uniform layer thickness can be attached. A groove-shaped air vent can be formed in the adhesive layer at the same time as the covering with the mount. That is, when the mount is peeled off when the label is attached to the plastic container, a groove-shaped air vent is formed in the adhesive layer corresponding to the ridge. In order to provide the mount with releasability, a commonly used release agent layer such as a silicon-based laminate or a silicon-based varnish may be formed on the surface of the mount by coating or the like.

As the adhesive used in the tack label of the present invention, any of thermosetting adhesives, heat-sensitive adhesives, pressure-sensitive adhesives and the like which are usually used in labels can be used.
As the thermosetting type, urethane-based adhesives, epoxy-based adhesives and the like can be given as typical examples, and in this case, extremely strong permanent adhesion is achieved. As the heat-sensitive type, a base based on an ethylene vinyl acetate copolymer, and if necessary, a tackifier such as a petroleum resin, a terpene resin, and rosins, or a mixture of various waxes is used. The base resin exhibiting pressure-sensitive adhesiveness is an acrylic copolymer containing a long-chain alkyl acrylate unit such as octyl acrylate or octyl methacrylate, or an adhesive such as an elastomer such as natural rubber and a rosin, a rosin derivative, a polyterpene resin, or a petroleum resin. A combination with a sex-imparting agent is used. Among these adhesives, it is preferable to use an acrylic adhesive because it has good adhesiveness to a polyolefin container. It should be noted that these adhesives may be compounded with a compounding agent known per se, for example, a thickener, a plasticizer, an antioxidant, a heat stabilizer, a filler, an organic solvent and the like according to a formulation known per se. .

As the label base material used in the present invention, any label base material usually used as a label base material can be used. For example, various plastic films, metal foils, papers,
And, a laminated body obtained by laminating these and the like can be mentioned, but usually, a stretched or unstretched plastic film alone,
Alternatively, it may be laminated with other plastic film, metal foil, paper, etc. Examples of the plastic film suitable for the substrate include crystalline polypropylene, crystalline propylene-ethylene copolymer, crystalline polybutene-1, crystalline poly-4-methylpentene-1, low-, medium- or high-density polyethylene. , Ethylene-vinyl acetate copolymer (E
VA), ethylene-ethyl acrylate copolymer (EE
A), ion-crosslinked olefin copolymer (ionomer)
Polyolefins such as polystyrene; aromatic vinyl polymers such as polystyrene and styrene-butadiene copolymers; halogenated vinyl polymers such as polyvinyl chloride and vinylidene chloride resins;
Nitrile polymers such as acrylonitrile-styrene copolymers and acrylonitrile-styrene-butadiene copolymers; polyamides such as nylon 6, nylon 66, para or metaxylylene adipamide; polyesters such as polyethylene terephthalate and polytetramethylene terephthalate Examples thereof include various polycarbonates and thermoplastic resins such as polyacetals such as polyoxymethylene. A print layer and, if desired, an overcoat layer are provided on the outer surface of the label by a conventional method to form a tack label having an aesthetic appearance.

As the plastic material constituting the container, the plastics already mentioned as the film base material of the label, for example, polyolefins, aromatic polymers, vinyl halide polymers, nitrile polymers, polyamides, polyesters, polycarbonates. , Polyacetal and the like can be used, but polyolefins are particularly preferable. These plastic materials may be used alone or in the form of a blend of two or more kinds, and the plastic container may have a single-layer structure or a laminated structure having two or more layers by, for example, melt extrusion. It may be. Examples of the plastic container to which the tack label of the present invention is attached include any container formed by a conventional means such as blow molding, biaxial stretch blow molding, injection molding or drawing molding, and shampoo or rinse. Polyolefin containers used as bottles for detergents, etc. are particularly preferable.

Next, the present invention will be specifically described with reference to the following examples. Melt blow molding of polyethylene and the internal capacity is 800c
I got a bottle of c. A tack label having a grid-like groove having a depth of 20 μm, a width of 0.4 mm, and an interval of 0.4 mm was formed on the adhesive surface of the bottle immediately after the molding by an ordinary label attaching method. As a result, all 100 samples were free of wrinkles and bubbles and had a good appearance. On the other hand, for comparison, when a tack label in which an adhesive was applied to the entire surface of the label was pasted on the bottle immediately after the molding by a normal pasting method, wrinkles and bubbles were generated in all 100 samples, and the appearance was observed. It became defective.

[0013]

According to the present invention, the adhesive layer provided on the label substrate is provided with a groove-shaped air vent, at least one end of which is open at the label end, so that the adhesive layer can be attached to a plastic container such as polyolefin. It is possible to obtain a tack label having an excellent appearance, which is free from blistering due to wrinkles and bubbles, and has a high practical value, and a plastic container to which the label is attached.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of groove-shaped air vents provided in an adhesive layer of a tack label of the present invention.

FIG. 2 is a diagram showing another example of groove-shaped air vents provided in the adhesive layer of the tack label of the present invention.

FIG. 3 is a view showing another example of groove-shaped air vents provided in the adhesive layer of the tack label of the present invention.

FIG. 4 is a cross-sectional view showing a relationship between a groove-shaped air vent provided in an adhesive layer of a tack label of the present invention and a base material.

FIG. 5 is a cross-sectional view showing another relationship between the groove-shaped air vent provided in the adhesive layer of the tack label of the present invention and the base material.

FIG. 6 is a cross-sectional view showing a state of a mount which covers the surface of the adhesive layer with the tack label of the present invention.

[Explanation of symbols]

 1 Tack Label 2 Air Vent 3 Label Substrate 4 Adhesive Layer 5 Mount 6 Convex Strip

Claims (8)

[Claims] 1. A tack label comprising a tack label composed of a base material and an adhesive layer and provided with a groove-shaped air vent, at least one end of which is opened at a label end. 2. The air vent is linear.
The tack label described in. 3. The air vent has a lattice shape.
The tack label described in. 4. The tack label according to claim 1, wherein the depth of the groove of the air vent is shallower than the thickness of the adhesive layer. 5. The tack label according to claim 1, wherein the depth of the groove of the air vent reaches the base material. 6. The tack label according to claim 1, further comprising a release liner provided on the adhesive layer. 7. A labeled plastic container in which the tack label according to claim 1 is attached to the outer surface of the plastic container. 8. The plastic container according to claim 7, wherein the plastic container is made of polyolefin.