JPH08450B2 - Insert label and decoration method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insert label that is attached to the surface of a molded product at the same time when the molded product is molded,
The present invention relates to a decoration method using this insert label.

[0002]

2. Description of the Related Art Conventionally, there have been the following methods for expressing irregularities on the surface of a molded product. (1) A method of manually attaching an uneven label having a pattern layer and a pressure-sensitive adhesive layer on the surface of a base sheet having an uneven shape to a molded product having a flat surface

(2) A method in which a flat label having a pattern layer and a pressure-sensitive adhesive layer formed on the surface of a flat base sheet is manually attached to a molded product having an uneven surface.

(3) A flat insert label having a pattern layer and a heat-sensitive adhesive layer formed on a flat base sheet surface is used for injection molding so that the base sheet of the insert label and the mold surface are in contact with each other. A method of placing a label on the mold surface, injecting molten molding resin into the adhesive layer of the label, and adhering the label to the surface of the molded product at the same time as molding the molded product on the uneven surface. Or using a foaming molding resin to form irregularities on the molded product.

[0005]

However, in the method (1), when the degree of unevenness of the base film is large, it is difficult to form a pattern layer on the surface and a clean pattern cannot be formed.

In the method (2), since the surface of the molded product is uneven, it is difficult for the label to adhere to the surface of the molded product.

In the case of (3), the unevenness of the mold and the design of the insert label cannot be accurately aligned. In addition, it is necessary to prepare a dedicated mold and a dedicated foaming resin each time the uneven shape is changed, which is costly. In addition, since the convex portions on the surface of the molded product fit in the irregularities of the mold, the molded product is caught in the grain of the mold and is difficult to take out, which is troublesome.

The present invention solves the above problems,
Even if the degree of unevenness is large, a clean pattern can be formed, it can firmly adhere to the surface of the molded product, the unevenness of the surface of the molded product and the pattern can be accurately aligned, and the insert label and this insert label are easy and inexpensive. It is intended to provide a decoration method used.

[0009]

According to the present invention, an insert label is formed by forming an uneven thermosensitive adhesive film on a base sheet having a pattern layer, and between the base sheet and the adhesive film. It was configured to have a large number of sealed spaces.

The present invention also provides a decoration method in which a pattern layer is formed on a base sheet, and a heat-sensitive adhesive film formed in an uneven shape is formed on the pattern layer. Place the insert label that has a number of closed spaces in the mold for injection molding so that the base sheet side contacts the mold surface, and after closing the mold, place it on the adhesive film side of the insert label. Insert label by injecting the molten molding resin, compressing the space of the insert label by the pressure of the molding resin, forming the insert label on the surface of the molded product at the same time as molding, and taking out the molded product from the injection mold. The space was expanded so that the base sheet had an uneven surface.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of the insert label of the present invention. 2 and 3 are sectional views showing one step of the embodiment of the decorating method of the present invention. FIG. 4 is a perspective view of a molded product obtained by the decorating method of the present invention. Figure 5
FIG. 3 is a sectional view of a part of a molded product obtained by the decorating method of the present invention.

First, the insert label 1 of the present invention will be described (see FIG. 1). The base sheet 11 is made of a stretched plastic film such as polypropylene or polyethylene terephthalate. Alternatively, paper, a laminated sheet of paper and a plastic film, synthetic paper of synthetic resin and paper, impregnated paper obtained by impregnating paper with synthetic resin, or the like may be used. The base sheet 11 may be one having fine irregularities such as a matte or matte surface formed on its surface.

The pattern layer 12 is formed on the base sheet 11. In FIG. 1, the pattern layer 12 is formed on the surface on which the adhesive film 2 is formed. The pattern layer 12 is a molded product 3
It is a layer drawn with ink or dye to decorate the surface. The patterns of the pattern layer 12 include colors, patterns, patterns, paintings, logos, characters, symbols, and figures. The pattern layer 12 is formed by a printing method or a coating method. The pattern layer 12 may have a pattern with a metallic luster formed by vapor deposition. The pattern layer 12 may be formed on the side opposite to the surface on which the adhesive film 2 is formed. In this case, a top coat layer for protecting the design layer may be formed on the design layer 12. The top coat layer is made of acrylic, chlorinated polypropylene or the like.
The top coat layer is formed by a printing method or a coating method.

The adhesive layer 13 is provided on the base sheet 11 if necessary.
It is formed on the side where the adhesive film 2 is formed. Adhesive layer 1
3 is a layer for adhering the base film 11 on which the pattern layer 12 is formed and the adhesive film 2. Adhesive layer 13
It is preferable to use a urethane or polyester two-component curable resin.

The adhesive film 2 is formed on the base sheet 11 having the pattern layer 12. The adhesive film 2 is formed in a concavo-convex shape 21, and a large number of sealed spaces 3 are formed between the base sheet 11 and the adhesive film 2. The adhesive film 2 may be made of a single type of resin or may be a laminate of different types of resins. As a method for forming the adhesive film 2 in the uneven shape 21, there is a method in which an adhesive film having a smooth surface that is extruded is sandwiched while heating between an embossing roll and a nip roll to form the uneven shape 21. As a method for forming the adhesive film 2 on the base sheet 11, it is preferable to use a dry laminating method in which the adhesive layer 13 is formed on the adhesive film 2, dried, and then laminated on the base sheet 11 and pasted with a nip roll. . When the adhesive film 2 formed in the irregular shape 21 and the base sheet 11 having a smooth surface on which the pattern layer 12 is formed are overlapped with each other, the adhesive film 2 is surrounded by the recessed portion of the surface of the adhesive film 2 and the base sheet 11. The closed portion becomes the sealed space portion 3, and many such space portions 3 are formed.

Next, a method for decorating the surface of a molded product using the insert label 1 of the present invention will be described (FIGS. 2-5).
reference). First, a pair of injection molding dies 41 and 42 for molding a cup-shaped container having a flange 52 and the insert label 1 are prepared.

Next, the insert label 1 is placed on the mold 42 so that the base film 11 of the insert label 1 contacts the mold surface 43 (see FIG. 2A). Figure 2
FIG. 2B is an enlarged view of the main part of FIG.

Next, after the mold 41 and the mold 42 are closed, the molten molding resin 5 is injected into the cavity 45 from the injection port 44, and the molding resin 5 is applied to the adhesive film 2 of the insert label 1. It is pressed and molded (see FIG. 3A). The adhesive film 2 is a thermosensitive resin film that adheres to the molding resin 5. As the molding resin 5, there are unstretched molded plastics such as polypropylene, polyethylene, polyester, polyethylene terephthalate, and polybutylene terephthalate, which are resins used in the insert molding method.

The numerous space portions 3 of the insert label 1 are
It is compressed by the injection pressure of the molding resin 5 and becomes a compressed space portion 31 having a small volume (see FIG. 3B). The surface of the adhesive film 2 is temporarily melted by the heat of the molding resin 5 and is solidified again in a state of being in contact with the molding resin 5, and the adhesive film 2 and the molding resin 5 are kept while having the compressed space portion 31. To be glued.

Next, the molded product 6 is removed from the mold 42. The compressed space 31 of the insert label 1 expands toward the base sheet 11 side of the insert label 1 to become an expanded space 32 (see FIG. 5). In this way, a molded product 51 in which the trunk portion having the pattern is decorated on the uneven surface 6 is molded (see FIG. 5).

The irregularities on the surface of the molded product 51 are formed by expanded air. Therefore, the heat insulating property, heat retaining property, and cold retaining property inside the molded product 51 are exhibited. Also, the surface of the molded product is soft to the touch and prevents slipping when held by hand.

[0022]

[Example] Thickness 25 made of polyethylene terephthalate
A pattern layer 12 for displaying a product name and a manufacturer name is formed on a base sheet 11 having a thickness of μm, and an adhesive layer 13 made of an acrylic resin is formed thereon. Further, the adhesive film 2 made of polypropylene and having a thickness of 50 μm is formed in the uneven shape 21 having the unevenness of 40 to 50 μm in depth. Next, the base sheet 11 and the adhesive film 2 are dry-laminated and bonded to each other, and punched out into a desired label shape.
The insert label has a large number of sealed spaces 3 having a size of 40 to 50 μm between the adhesive label 1 and the adhesive film 2.

Next, a mold device having a pair of molds 41 and 42 for molding the cup-shaped container is prepared. The insert label 1 is placed in a mold for injection molding so that the mold surface 43 corresponding to the body of the cup-shaped container is in contact with the base sheet 11 side. After the mold is closed, the molten molding resin 5 is injected to the adhesive film 2 side of the insert label to form the molding resin 5
The space 3 of the insert label 1 is compressed by the pressure of
At the same time as molding, the insert label 1 is attached to the surface of the molded product 51. The compressed space portion 3 of the insert label 1 is obtained by taking out the molded product 51 from the mold for injection molding.
1 expands, the base sheet 11 becomes an uneven surface, and the uneven surface 6 becomes a cup-shaped container.

[0024]

According to the present invention, an insert label is formed on a base sheet having a pattern layer, a heat-sensitive adhesive film formed in an uneven shape is formed, and a large number of hermetically-sealed adhesive films are provided between the base sheet and the adhesive film. It was configured to have a space.

Therefore, since it is not necessary to form the pattern layer on the surface of the uneven base sheet, a molded product having a clean pattern layer can be obtained even when a molded product having an uneven surface with large steps is obtained.

The present invention is a decoration method, in which a pattern layer is formed on a base sheet, and a heat-sensitive adhesive film formed in an uneven shape is formed thereon, and a large number of layers are provided between the base sheet and the adhesive film. Place the insert label, which has a closed space, in the mold for injection molding so that the base sheet side is in contact with the mold surface, and after the mold is closed, melt the molding on the adhesive film side of the insert label. Inject the resin, compress the space of the insert label by the pressure of the molding resin,
At the same time as molding, an insert label is formed on the surface of the molded product,
By taking out the molded product from the mold for injection molding, the space of the insert label was expanded and the base sheet was made to have an uneven surface.

Therefore, since the molded product is decorated by the insert molding method, the insert label firmly adheres to the surface of the molded product. Further, since the surface is provided with irregularities at the same time as the molding of the molded product, the decoration efficiency is good.

Further, it is not necessary to use a mold having unevenness, and it is not necessary to place an insert label in accordance with the position of unevenness of the mold. Further, since it is not necessary to prepare a dedicated mold or a dedicated foaming resin, it does not cost much.

The irregularities on the surface of the molded product 51 are formed by expanded air. Therefore, the molded product 51
The internal heat insulation, heat retention, and cold insulation are exhibited. Also, the surface of the molded product is soft to the touch and prevents slipping when held by hand.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an insert label of the present invention.

FIG. 2 is a cross-sectional view showing a step of the embodiment of the decorating method of the present invention.

FIG. 3 is a cross-sectional view showing one step of an embodiment of the decorating method of the present invention.

FIG. 4 is a perspective view of a molded product obtained by the decorating method of the present invention.

FIG. 5 is a sectional view of a part of a molded product obtained by the decorating method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insert label 11 Base sheet 12 Design layer 13 Adhesive layer 2 Adhesive film 21 Concavo-convex shape 3 Space part 31 Compressed space part 32 Expanded space part 41 Mold 42 Mold 43 Mold surface 44 Injection port 45 Cavity part 5 Molding Resin 51 Molded product 52 Flange 6 Uneven surface

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Claims (2)

[Claims] 1. A thermosensitive adhesive film formed in an uneven shape is formed on a base sheet having a pattern layer, and has a large number of sealed spaces between the base sheet and the adhesive film. An insert label characterized by the following. 2. A pattern layer is formed on a base sheet, a heat-sensitive adhesive film formed in an uneven shape is formed on the pattern layer, and a large number of sealed spaces are provided between the base sheet and the adhesive film. Place the insert label in the mold for injection molding so that the base sheet side is in contact with the mold surface, and after closing the mold, inject the molten molding resin into the adhesive film side of the insert label to mold. The space of the insert label is compressed by the pressure of the resin, the insert label is formed on the surface of the molded product at the same time as molding, and the space of the insert label is expanded by removing the molded product from the mold for injection molding, and the base sheet is removed. A decorating method characterized by having an uneven surface.