JPH03262626A - Labeled vessel - Google Patents

Abstract

PURPOSE:To obtain a plastic bottle, both the label and body of which are mat, by a method wherein mat varnish is applied to the surface of base material such as unstretched polypropylene film or the like. CONSTITUTION:Mat varnish 2 is applied to the surface of label base material 1 made of unstretched polypropylene film. The mat varnish 2 is transparent ink, which is prepared by adding silica as matting agent and the like in place of pigment component. Further, by changing the degree of addition of silica, the degree of matting can be changed. Furthermore, by laminating polyethylene film 6 through adherent resin 5 to the rear surface of the unstretched polypropylene film for bonding to a polypropylene bottle, the lamination of the label and the bottle is possible due to the high surface activity of urethane- based inky surface and the resultant good adhesion between the adhesive and the film.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a container with a label for use as a storage container for cosmetics such as shampoo conditioners, hair blowers, etc., and toiletries such as kitchen detergents and bath detergents. Regarding plastic bottles.

<Prior art> Conventionally, when attaching labels to plastic containers for storing cosmetics, toiletries, etc., the front side of the paper label is printed, adhesive such as vinyl acetate is applied to the back side, and the label is attached in a later process after the container is formed. was common.

Another method in the labeling process is to use a label with an adhesive, and apply the label to the bottle while peeling off the release paper on the back side of the label.

The problem with these products is that they use glue such as vinyl acetate, so if they are used in places with heavy water, such as baths or kitchens, the label may peel off or tear, and there are many problems with the appearance. It has occurred.

Therefore, recently, we have applied a gentle adhesive to the back of the label, and when making a bottle acid mold, the label is roughly tightened and installed in the mold.
An acid-form method has been proposed in which the label fungal adhesive is melted during container molding and integrated into the plastic bottle. This acid form method is commonly called in-mold molding.

<Problems to be Solved by the Invention> Conventionally, label base materials for in-mold molding (the thickest layer that is printed and becomes the outermost layer of the label) used for plastic bottles made of polyethylene, for example, do not absorb heat during bottle molding. Due to the problem of shrinkage, it is considered to use an unstretched film that has excellent followability against heat shrinkage.In this case, polypropylene film is most suitable for the unstretched film due to issues such as printing suitability and heat resistance. be. Note that the unstretched polypropylene film has a glossy surface, which is also one of its characteristics.

On the other hand, when the plastic bottle body is made of polyethylene, the bottle surface is generally matte due to its resinous properties and problems in blow molding.

Therefore, when a label made of printed unstretched polypropylene film is integrally molded with a polyethylene bottle (in-mold molding), a glossy label is attached to a matte bottle, resulting in a very attractive design. The result is a plastic bottle with a surface that looks strange.

Therefore, an object of the present invention is to provide a plastic bottle made of polyethylene using a label made of unstretched polypropylene film, in which both the label and the bottle are in a matte state.

<Means for solving i+am> In order to solve the above problems, the present invention is characterized in that a matting varnish is applied to the surface of a base material such as an unstretched polypropylene film. As a second means, fine embossing is applied to the surface of the base material of the label,
A label made of an unstretched plastic film that causes light scattering and has a matte appearance is integrally molded onto a plastic bottle.

The present invention will be explained in detail below.

The film that serves as the base material of the in-mold label is an unstretched polypropylene film. The stretched film shrinks due to the heat generated during plastic homolytic molding, resulting in wrinkles on the label after molding.

As mentioned above, it is necessary to use an unstretched film in order to follow the shrinkage of the bottle.

The surface of this unstretched polypropylene film has a very glossy appearance, so in order to integrally mold it into a polyethylene plastic bottle, the surface must be treated to matte.

The matte processing method will be explained below.

There are two types of matte treatment methods.As shown in Figure 1, the first method involves applying a matte varnish (2) to the surface of the label base material (1) made of unstretched polypropylene film. This is the way to do it. The matting varnish (2) is a transparent type of ink in which silica or the like is added as a matting agent in place of the pigment. Note that it is possible to change the degree of matteness by changing the degree of addition of silica.

The resin type of the ink can be selected depending on the base material to be coated, such as urethane type, polyamide type, or chlorinated rubber thread ring, and silica or the like is generally added to these mediums.

Moreover, these matte varnishes (2) can be made into gravure ink or offset ink, and can be selected according to the printing method.

As for the second method, as shown in Figure 2, the surface of the base material (1) made of unstretched polypropylene film is finely embossed (3) to give it a matte appearance due to the light scattering effect. be.

In this method, micro-embossing can be performed simply by passing an unstretched polypropylene film under an embossing roll.

As for the degree of embossing, a depth of about 1 to 2 microns is usually sufficient, and if a more matte degree is required, this can be achieved by using a deeper embossing roll.

Next, the numerical evaluation of matteness will be explained.

- In boat fishing, the degree of fading is expressed by the degree of gloss.

Glossiness is a numerical expression obtained by capturing the reflected light when light is irradiated from an oblique angle. Therefore, the higher the glossiness value, the more glossy it is evaluated.

Usually, the gloss level of a polyethylene bottle is about 10 to 30, and at this level, it cannot be said that there is a rim, and the bottle is in a matte state.

Next, the matte film processed by the first method and the second method is printed (4) for design purposes, but if a front and back printing machine (mainly gravure printing) is used, the matte film is printed at the same time as the matte film. It can also be erased.

Note that it is best to use a means such as gravure printing for printing the unstretched polypropylene film. As the ink used for printing polypropylene film, it is most desirable to use urethane-based ink from the viewpoint of its adhesion.

Furthermore, in order to adhere to the polyethylene bottle, a polyethylene film (6) is attached to the back side (opposite the matte side) of the unstretched polypropylene film via an adhesive resin (5).
Since the urethane ink surface has high surface activity, it is possible to achieve good adhesion with the adhesive. Note that dry lamination method 1 is possible if a urethane adhesive is used as the adhesive.

In addition, a polyethylene resin may be laminated on an unstretched polypropylene film by extrusion lamination to form an adhesive layer with a polyethylene bottle.

By punching the laminate film described above into a label shape, it can be used as an in-mold label, and can be integrally molded with a plastic bottle under normal in-mold molding conditions.

Effects> The present invention has the above-described structure, and the surface of the label is in a matted state, and there is no variation in the state of the mating between the label and the surface of the bottle, and the appearance is not impaired.

<Example 1> The present invention will be explained in detail below.

For the in-mold label base material, unstretched polypropylene (hereinafter abbreviated as CPP) 60μ (manufactured by Toshi Daisoko Co., Ltd., 3931
) was used.

Printing on the CPP film was performed by gravure printing using urethane ink (Lamister, manufactured by Toyo Ink Co., Ltd.).

For the matte finish, a urethane resin-based ink containing 10% silica powder was prepared and applied as a matte varnish to the surface of the CPP film by gravure printing.

The gloss level at this time was 10 to 15, indicating a sufficiently faded state.

The CPP film and the polyethylene film (Tamabo IJIJM14P40μ), which is the adhesive resin layer, are laminated using a urethane adhesive (Dainippon Ink EPS75).
Using A/KW40), apply adhesive to the printed surface of the CPP film and dry laminate.

The laminate film produced by the above method was punched into a label shape and used as a label for in-mold molding.

The plastic bottle was a blow-molded bottle using high-density polyethylene resin (B5032A manufactured by Tonen Petrochemical Co., Ltd.), and was integrally molded by inserting the above-mentioned label into a mold.

As a result, a plastic bottle was obtained that had the same degree of matteness (level of surface gloss) as that of the bottle and did not give any discomfort in appearance.

<Example 2> As an in-mold label base material, a CPP film 25 μm (manufactured by Tohcello Co., Ltd., name: NP-3, film adjusted to have a gloss level of 4 to 7 and a depth of 1 μm by micro-embossing) was used.

Printing on this film and lamination of an adhesive resin layer on the back surface were carried out in the same manner as in Example 1. In addition, the production of a plastic bottle and the in-mold molding of a label were carried out in the same manner as in Example 1. As a result, a plastic bottle with a similar degree of matteness (surface gloss) between the label and the bottle, and which had no discomfort in appearance. was gotten.

Comparative Example> The surface of the CPP film, which is the label base material explained in Example 1, was used as a label without being matted, and in-mold molding was performed in the same manner as in Example 1.

As a result, the glossiness of the label was 90, whereas the polyethylene bottle had a glossiness of about 15, and the bottle and label had a very strange feeling and the plastic bottle was unbalanced in appearance.

<Effects of the invention> When a plastic bottle made of polyethylene or the like and a label are integrally molded, an unstretched polypropylene film with a matte finish on the label surface is used as the base material.
It has become possible to obtain a labeled container with a very clean appearance that does not give any discomfort as a bottle whose surface glossiness is similar to that of a plastic bottle.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a first example of a label according to the present invention, and FIG. 2 is a sectional view showing a second example. (3) ... (5) ... (6) ... Embossing (4) ... Printing adhesive resin polyethylene film patent applicant Kazuo Suzuki, Representative of Toppan Printing Co., Ltd.

Claims (4)

[Claims] (1) A labeled container formed by integrally molding a label made of a plastic film at the same time as a plastic bottle, characterized in that the surface of the label is subjected to a matte treatment. (2) The labeled container according to claim (1), characterized in that a matte varnish layer is provided on the surface of the label. (3) The labeled container according to claim (1), characterized in that a minute embossing is provided on the label surface. (4) The labeled container according to any one of claims (1) to (3), wherein the label base material is made of an unstretched plastic film.