JP2929658B2 - Plastic bottle with label - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention is directed to attaching a label to be used as a storage container for cosmetics such as shampoos, conditioners, hair blows, etc .; About plastic bottles.

<Conventional technology> Conventionally, when labeling a plastic container for storing cosmetics, toiletries, etc., a label is printed on a paper label, a glue such as vinyl acetate is attached to the back surface, and post-processing is performed after the container is formed. It was common to stick with.

In the labeling step, a label with an adhesive is used as another method, and the label is adhered to the bottle while peeling off the release paper on the back surface of the label.

As for these problems, the use of glue such as vinyl acetate causes drawbacks such as peeling or tearing of the label when used in places with strong water around, such as baths and kitchens. It has occurred.

Therefore, recently, a heat-sensitive adhesive is applied to the back of the label, the label is pre-mounted in the mold at the time of bottle molding, and the adhesive at the back of the label is melted by the heat at the time of molding the container.
A molding method for integrating with a plastic bottle has been proposed. This molding method is commonly called in-mold molding.

<Problems to be Solved by the Invention> Labels generally used for in-mold molding are printed on a plastic film or synthetic paper by gravure or offset. Further, there are many cases in which a metal foil layer is provided or metal heat treatment is performed to impart design properties.

The most common and basic configuration of the label in this case is that a plastic film or synthetic paper is printed, and the plastic film or the synthetic paper and a metal film-coated plastic film or a synthetic film are used. This is a configuration in which paper is attached and an adhesive layer for heat bonding with a plastic bottle is provided on the innermost layer.

The problem here is that in the above-described label configuration, the metal foil layer or the metal deposition layer is eroded from the label end face by water or soapy water, and the distance between the printing surface and the metal foil layer or the metal deposition layer is increased. Delamination is observed.

An object of the present invention is to provide a labeled plastic bottle which does not peel off a printing surface and a metal deposition layer even when a bottle provided with a label provided with a metal deposition layer is used for a long time in a place where water is used. Things.

<Means for Solving the Problems> An unstretched polypropylene film provided with a printed layer on the back surface and a metal-deposited layer not reaching the edge on the front surface in a plastic bottle with a label formed by integrally molding a label at the same time as forming the plastic bottle. A plastic bottle with a label, wherein a label using a laminated material obtained by integrating an unstretched polypropylene film provided with an adhesive layer with an adhesive layer is integrally formed.

 Hereinafter, the present invention will be described in detail.

As shown in, for example, FIG. 3 of the basic structure of the label according to the present invention, a plastic film (1) / printed layer (2) /
Adhesive layer (3) / metal deposited layer (4) / unstretched polypropylene film (6) / adhesive layer (7). (8)
Is a plastic film for bonding to a bottle.

First, a plastic film that serves as a label substrate (1)
The printing layer (2) applied to the substrate will be described.

Plastic film is commonly used biaxially oriented polypropylene film, unoriented polypropylene film,
A polyester film or the like can be used, but an unstretched polypropylene film is most desirable in terms of followability to heat shrinkage during molding of a plastic bottle.

The resin system of the ink can be selected depending on the base material to be applied, such as a urethane system, a polyamide system, a polyester system, and a chlorinated rubber system, and can be favorably printed using a means such as gravure printing.

In particular, it is most desirable to use a urethane-based ink as the ink used for printing a polypropylene film from the viewpoint of its adhesion.

 Next, the metal deposition layer (4) is sharpened.

The metal used for metal deposition is generally aluminum, titanium, stainless steel, or the like, but it is most preferable to use aluminum from the viewpoint of workability, cost, and the like.

Vapor deposition methods include vacuum deposition, sputtering, ion plating, and the like. Of these, vacuum deposition is most desirable from the viewpoint of processability.

The following three methods are generally used to form the non-deposited portion (5) by partially removing the edge of the deposited layer.

As a first method, a portion to be removed from a base material to be deposited is subjected to pattern printing with an aqueous varnish, and then a metal deposition is performed on the entire surface, and washed with water in a final step, so that a metal-deposited portion on the aqueous varnish is made aqueous. It is removed together with the varnish and partial deposition is performed.

The second method is to perform metal deposition on the entire surface of the substrate to be deposited,
This is a method in which an acid- or alkali-resistant varnish is applied to a portion not to be removed, and the metal-deposited layer is removed by etching the metal-deposited layer with an acid or an alkali.

The third method is a method in which a portion not to be vapor-deposited is masked and metal is vapor-deposited.

By the above-described method, it is possible to form a vapor-deposited portion and a non-deposited portion.

Next, the lamination of the printed unstretched polypropylene film (1) and the vapor-deposited unstretched polypropylene film (6) whose edge is partially removed from the vapor-deposited polypropylene film will be described.

In this lamination, a general thermosetting adhesive is applied to the printing surface, and a metal-deposited unstretched polypropylene film is laminated to form a laminate.

Further, for adhesion to the bottle, a plastic film (8) for adhesion to the bottle may be laminated via an adhesive on the back surface (non-deposition surface) of the unstretched polypropylene film provided with the metal vapor-deposited layer. As the laminate, a normal dry laminate, an extrusion lamination, or the like can be used.

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

<Function> The present invention is configured as described above. Even if it is placed in a place where water is used, such as a washroom or a bathroom, even if water or soapy water touches the label scene, the metal deposition layer Does not reach the edge of the label, so that moisture does not erode the metallized layer.

In addition, since an unstretched polypropylene film is used as the base material of the label, it can follow the heat shrinkage during the molding of the plastic bottle, and can be molded without wrinkles.

<Example 1> Hereinafter, an example of the present invention will be described.

Unstretched polypropylene (hereinafter abbreviated as CPP) 60μm (3931 manufactured by Toray Gosei Co., Ltd.)
Was used.

The printing on the CPP film was performed by gravure printing using a urethane-based ink (Ramister manufactured by Toyo Ink Manufacturing Co., Ltd.).

Metal-deposited film, Toyo Metallizing Co., Ltd. high adhesion type (CPP film substrate) 25μm, acid-resistant varnish is applied to the part to be left as metal vapor-deposited, etched with acid, vapor-deposited part and non-vapor-deposited Created part. The non-deposited portion was designed so that when the film was punched into a label, the deposited layer was continuously formed around the label so as not to reach the edge of the label.

The lamination of the printed CPP film and the hot metal film and the lamination of the polyethylene film (M14P40μm manufactured by Tamapoly Co., Ltd.) as the adhesive resin layer with the bottle are made of a urethane-based adhesive (Dainippon Ink Co., Ltd.) ), Dry lamination was performed using EPS75A / KW40).

The laminated film prepared by the above method was punched into a label shape and provided for a label for in-mold molding.

The plastic bottle is a hollow molded bottle using a high-density polyethylene resin (B5032A, manufactured by Tonen Petrochemical Co., Ltd.), and the above-described laminate was inserted into a mold at the time of molding to be integrally molded.

As a result, even when the bottle in which the label was in-mold molded was immersed in soapy water for 24 hours, no delamination between the printing surface and the metal deposition layer was observed from the label end surface.

<Comparative Example> In-mold molding was performed using the CPP film as the label substrate, the metal-deposited film, and the polyethylene film as the adhesive layer to the bottle used in Example 1 as they were.

Since the metal-deposited film was not subjected to the etching treatment, the same physical property evaluation as in Example 1 was performed. As a result, peeling was observed between the printed surface of the label and the metal-deposited surface.

<Effect of the Invention> Since the present invention has the above configuration, a plastic bottle with a label having a metal vapor-deposited layer free from wrinkling, corrosion, and delamination can be obtained in a plastic bottle with a label that is increasingly required to have designability. Can be

[Brief description of the drawings]

 FIG. 1 is a sectional view of a label according to the present invention. (1) Plastic film (2) Printing layer (3) Adhesive layer (4) Metal-deposited layer (5) Non-deposited part (6) Unstretched polypropylene film (7) … Adhesive layer (8) …… Plastic film

──────────────────────────────────────────────────の Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B29C 49/24

Claims (1)

(57) [Claims] An unstretched polypropylene film provided with a printed layer on the back side and a metal-deposited layer provided on the front side with a metal-deposited layer provided on the front side in a plastic bottle with a label formed by integrally forming a label at the same time as forming the plastic bottle. A plastic bottle with a label, wherein a label using a laminated material obtained by integrating a stretched polypropylene film with an adhesive layer is integrally formed.