JP2995458B2 - In-mold label with light concealment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-mold label which is inserted into a mold at the time of molding a container and is attached to the container at the same time as injection molding. The present invention relates to an in-mold label having a function of protecting an in-mold label.

[0002]

2. Description of the Related Art In the case of dessert food containers such as jam, jelly and pudding, if the container itself is a molded article of a transparent material, a light-hiding label is required for preserving the contents for a long period of time. Need to cover the container. Therefore, for example, in the composite container disclosed in JP-A-7-232723, a synthetic paper made of a stretched resin film is used as a base layer, a light-shielding layer is provided on the back surface, and a heat-sensitive resin adhesive is bonded to the back surface of the light-shielding layer. A blank (in-mold label) provided with a layer (heat seal layer) is used, and the blank is inserted into a mold so as to be heat-sealed integrally with the container at the time of molding the container.

[0003]

However, in the case of the above-mentioned conventional in-mold label, it is necessary to separately provide a light shielding layer between the base material layer and the heat seal layer. There is a problem of sticking.

[0004] Therefore, it is an object to provide an inexpensive in-mold label having a light concealing property. An object of the present invention is to solve this problem.

[0005]

The object of the present invention is to provide an in-mold label provided with a heat sealing layer made of a thermoplastic resin having a light shielding property on the back side of the base material layer. Or a thermoplastic resin having the light shielding property
The heat-seal layer is white and the back of the base layer is black.
With a white heat layer on the back of the black solid print layer.
The problem can be solved by providing a seal layer . In this case, there is no need to separately provide a light shielding layer.

[0006] In addition, as claimed in claim 2, wherein, in Mall
Thermoplastic with light hiding on the back side of substrate layer
And that provided a heat seal layer made of a resin, it may be assumed had use <br/> a synthetic paper having a hiding property to the base material layer made of stretched resin film. When such a synthetic paper is used for the base material layer, since the synthetic paper itself also has a light concealing property, it can more reliably block ultraviolet rays and the like.

[0007] As described in claim 3, according to claim 2,
In this case , the heat sealing layer made of a thermoplastic resin having light shielding properties is, for example , black. In this case, the black heat seal layer blocks ultraviolet light, visible light and infrared light.

[0008] As described in claim 1, it has a light concealing property.
When the heat seal layer made of thermoplastic resin is white, and a solid black print layer is provided between the base material layer and the heat seal layer ,
The white heat seal layer blocks ultraviolet rays and improves the design of the label as viewed from the back through the transparent container. In addition, visible light and infrared light are blocked by the solid black print layer.

[0009] In any of the above structures, it is preferable to provide a white print layer on the surface side of the base material layer. Especially,
When the base layer is not a synthetic paper having a light concealing property, it is preferable to increase the light concealing property by providing a white print layer on the surface side of the base layer in this way. The provision of the white print layer on the surface side of the base material layer improves the light concealing property, and further improves the design property when pattern printing is performed on the surface side.

[0010]

FIG. 1 shows a layer structure (Example 1) of an in-mold label 1 according to the present invention. This in-mold label 1 forms a solid white printed layer 3 on the side that will be the surface of the base layer 2 made of synthetic paper, and forms a solid black printed layer 4 on the side that will be the back side of the base layer 2. A heat seal layer 5 made of a white thermoplastic resin is formed on the back surface of the base layer 2 on the side of the black solid print layer 4, and the surface of the white solid print layer 3 on the front side has a glossy surface. It is composed of a laminate on which a certain OP (overprint) varnish layer 6 is formed. However, in this case, the white print layer 3 may not be provided. This in-mold label 1 is made of polypropylene (P
P), inserted into a mold when molding a container made of impact-resistant polystyrene (HIPS) or the like, and attached to the container at the same time as injection molding.

The synthetic paper is made of a stretched resin film having a large number of fine pores,
As the base material layer 2, for example, YUPO synthetic paper is suitable. YUPO synthetic paper can be printed on both sides and has its own concealing properties (light shielding properties against ultraviolet rays).

The white ink of the white solid printing layer 3 is, for example, a urethane ink, and the black ink of the black solid printing layer is, for example, a urethane ink.

The thermoplastic resin of the heat seal layer 5 is, for example, a chlorinated polypropylene resin. As the thermoplastic resin, a resin having good melt adhesion is selected according to the molding resin of the container. For example, when the container is made of polypropylene, the thermoplastic resin is a chlorinated polypropylene resin. When the container is made of impact-resistant polystyrene, the thermoplastic resin is an acrylic resin. When the thermoplastic resin is white, 30 to 50% by weight of a white pigment such as titanium oxide is contained, and when the thermoplastic resin is black, 8 to 15% by weight of a black pigment such as carbon black is contained. To provide concealment

The OP varnish layer is, for example, an acrylic two-liquid ink.

FIG. 2 is a plan view of the in-mold label 1. Since the black solid print layer 4 loses its design if it comes out of the end face of the label, it is preferable to form it with a margin around as shown in FIG.

In the in-mold label, a heat seal layer may be provided directly on the back surface of the base material layer, and a black thermoplastic resin may be used for the heat seal layer. In this case, the in-mold label is formed by forming a white solid printed layer on the surface of a base layer made of synthetic paper, forming a heat seal layer made of a black thermoplastic resin on the back surface of the base layer, and forming a white seal layer on the front side. It is assumed that an OP varnish layer is formed on the surface of the solid print layer (Example 2). Also in this case, the white solid printed layer on the front side may be omitted.

In the in-mold label, ordinary paper other than synthetic paper may be used as the base material layer. In this case, the in-mold label is formed by forming a white solid printing layer on the surface of paper as a base material layer, forming a black solid printing layer on the back surface of the paper, and forming a heat seal layer made of a white thermoplastic resin on the back surface. , And an OP varnish layer is formed on the surface of the white solid printing layer on the front side (Example 3), or a white solid printing layer is formed on the paper surface, and a black heat is applied on the back surface of the paper. A heat seal layer made of a plastic resin is directly formed, and an OP varnish layer is formed on the surface of a white print layer on the front side (Example 4).

FIG. 3 shows the light shielding characteristics of each sample of the in-mold label. The figure is a graph in which the horizontal axis indicates the wavelength of light and the vertical axis indicates the shielding factor. Each of the samples has the layer configuration of Example 1 described above. Note that all printing is gravure printing. Each of the sample a and the sample b has a base layer of YUPO base paper, and the thickness of the black solid printing layer is different (the black solid printing layer of the sample b is thicker). In sample c, the base material layer is a special label base paper. And
In both samples d and e, the base material layer is a sampapier base paper, and there is a difference in the thickness of the black solid printing layer (the black solid printing layer of sample e is thicker). In the comparative product, the base layer is a special label base paper, a solid white print layer is formed on the surface, a solid black print layer is formed on the back surface, a white solid print layer is formed on the back surface, and the back surface is formed on the back surface. A heat seal layer is formed. In this case, the heat seal layer is not impregnated with the black ink or the white ink.

FIG. 4 shows the light shielding characteristics of the base paper itself of each synthetic paper. This figure also shows the light wavelength on the horizontal axis and the shielding ratio on the vertical axis (the vertical axis is scaled down from FIG. 3). Further, the comparative product is the same as the comparative product in FIG.

As can be seen from FIGS. 3 and 4, the Yupo base paper, the special label base paper, and the San Papier base paper have low light concealing properties themselves. (Samples a, b, c, d, e)
In particular, it has a large light concealing property with respect to light in a region from a wavelength exceeding 700 mm to an infrared region.

[0021]

According to the present invention, an inexpensive light-shielding in-mold label that does not require a separate light-shielding layer can be obtained. In addition, the whiteness of the heat seal layer can improve the design of the label as viewed from the back side through the transparent container.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a layer configuration of an in-mold label according to the present invention.

FIG. 2 is a plan view of an in-mold label according to the present invention.

FIG. 3 is a graph showing light concealment characteristics of each sample according to the present invention.

FIG. 4 is a graph showing the light concealment characteristics of the base paper itself of each synthetic paper used for the in-mold label according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 In-mold label 2 Base material layer 3 White solid printing layer 4 Black solid printing layer 5 Heat seal layer 6 OP varnish layer

Claims (4)

(57) [Claims] 1. A heat-shielding material having a light concealing property on the back side of a substrate layer.
An in-mold label that is provided with a heat seal layer made of a plastic resin , is inserted into a mold at the time of molding the container, and is welded to the container at the same time as molding, wherein the thermoplastic resin having the light shielding property is provided.
The heat seal layer made of fat is white, and the back of the base layer is
A black solid printing layer is provided on the surface, and the front side of the black solid printing layer is
In-mold label having a light hiding properties, characterized in that a serial heat seal layer. 2. A heat shield having a light concealing property on the back side of the base material layer.
A heat seal layer made of plastic resin is provided to
Immobilizer that is inserted into the mold and welded to the container at the same time as molding
An in-mold label having a light concealing property , wherein a synthetic paper having a concealing property made of a stretched resin film is used for the base layer. 3. The light-shielding in-mold label according to claim 2 , wherein the heat sealing layer made of a light-shielding thermoplastic resin is black. 4. A white printed layer is provided on the surface side of the base material layer.
An in-mold label having a light concealing property according to claim 1 .