JP3536662B2 - Label with diffraction grating pattern - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various labels provided with a diffraction grating pattern typified by a hologram or the like, and in particular, to improve the robustness of an information recording portion recorded on a label by printing or a label printer. The present invention relates to a label having a diffraction grating pattern.

[0002]

2. Description of the Related Art Hitherto, various labels provided with a diffraction grating pattern by hologram, EB drawing and the like are known. As a method of recording information or the like on the label, there are a thermal transfer, an ink jet, a foil stamping method, and a laser marking method in addition to the printing method. This laser marking method is a technology in which a metal deposition layer for making the diffraction grating pattern brighter and sharper is melted in a non-contact manner from the transparent plastic substrate surface by irradiating a laser beam such as YAG or CO ₂ to form a printing pattern. is there. In other words, in a method that can be recorded in a non-contact manner on the metal deposition layer of the label,
In addition to being used for labels having diffraction grating patterns represented by holograms, for example, printing unique information on cards with holograms, ID cards, passports, etc. is extremely effective in preventing tampering, so it is effective in maintaining security. It is. However, depending on the type of transparent plastic substrate that protects the top surface of the metal deposition layer that is melted,
Since it is necessary to select an appropriate laser oscillation device and its oscillation output, there have been problems such as high initial investment cost, high running cost, and complicated maintenance work.

On the other hand, in the above-mentioned various methods such as a printing method for recording on a label surface and a thermal transfer method which are advantageous in terms of cost and maintenance, the robustness of information recorded due to impurities on the label surface, for example, cellophane tape peeling There was a problem in the properties and friction resistance. In addition, although there was a method of providing a thin film coating layer with a thermoplastic resin or the like on the label surface, the resin applied during processing does not cause a blocking phenomenon on the back surface of the raw material. It became necessary to carefully consider, select, and design combinations.

[0004]

That is, in various labels provided with a diffraction grating pattern typified by a hologram or the like, a low molecular material which is considered to bleed from the inside of the raw material during aging of the raw material is used. Conventionally, when characters or numbers were added to a label by printing or a label printer, the cellophane tape peeling and abrasion resistance were weak. Accordingly, the present invention provides a thin film layer made of a thermoplastic resin or the like on the label surface to mask impurities, thereby imparting printability and label printer suitability, and further improving the robustness of recorded information. It is an object to provide a label having a grid pattern.

[0005]

In order to achieve the above object, the present invention provides a method for forming a diffraction grating pattern forming layer, a diffraction grating pattern, a metal deposition layer on one surface of a transparent plastic substrate.
Pressure-sensitive adhesive layer or diffraction grating pattern forming layer, metal deposition layer, diffraction grating pattern, pressure-sensitive adhesive layer or metal deposition layer,
In a label having a diffraction grating pattern, a pressure-sensitive adhesive layer laminated with an adhesive layer, and a diffraction grating pattern in which an information recording portion is provided on the surface of the base material, the surface of the base material has a glass transition point or a softening point having a thermoplasticity of room temperature or lower. A label having a diffraction grating pattern, comprising: a low glass transition point thin film layer made of a resin; and a high glass transition point thin film layer made of a thermoplastic resin having a glass transition point or a softening point exceeding room temperature.

The glass transition point or softening point of the low glass transition point thin film layer made of the thermoplastic resin is 20 ° C. or less, and the glass transition point or softening point of the high glass transition point thin film layer made of the thermoplastic resin is 50 ° C. C. or higher.

The thickness of each of the thin film layers is at least
It is characterized by being in the range of 0.5 μm to 3.0 μm .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described below with reference to the drawings. FIG. 1 is an explanatory view showing a cross section of a label having a diffraction grating pattern according to one embodiment of the present invention, and FIG. 2 is an explanatory view of a label having a diffraction grating pattern according to another embodiment. The label having the diffraction grating pattern of the present invention is obtained by laminating a back surface of a substrate 11 made of transparent polyethylene terephthalate or the like, a diffraction grating pattern forming layer 12, a diffraction grating pattern 13, a metal deposition layer 14, and an adhesive layer 15; And a label 10 having a diffraction grating pattern provided with an information recording section 20 on the base material surface, and having a low TG made of a thermoplastic resin or the like having a glass transition point (hereinafter referred to as TG) or a softening point at room temperature or lower. A thin film layer 18 and a high T made of a thermoplastic resin or the like having a TG or a softening point exceeding room temperature.
A label having a diffraction grating pattern, comprising a thin film layer 19 of G. That is, by providing the thin film layers 18 and 19 made of a thermoplastic resin or the like on the label surface, impurities on the label surface can be masked, and at the same time, suitability for printing and suitability for a label printer are provided. As a result, it is possible to obtain a label in which the adhesion of the information recording section 20 is improved and the robustness is further enhanced.

First, the low TG thin film layer 18 is intended to mask impurities such as a low molecular material bleeding on the label surface. Therefore, the low TG thin film layer is made of a material having viscosity at room temperature. It is desirable to use the TG
Alternatively, the softening point is desirably 20 ° C. or less. This material includes polyester, polyester urethane,
A thermoplastic resin such as an epoxy resin or an acrylic resin alone or a mixture thereof can be used.

The high TG thin film layer 19 is intended to prevent blocking on the back surface and to impart printability and label printer suitability.
It is desirable to use a material whose G or softening point is higher than room temperature, and its TG or softening point is preferably 50 ° C. or higher.
As materials, polyester, polyester urethane,
A thermoplastic resin such as an epoxy resin or an acrylic resin alone or a mixture thereof can be used.

The thickness of the low TG thin film layer 18 and the high TG thin film layer 19 is 0.2 μm or more, preferably 0.5 μm.
m to 3.0 μm, and more than 3.0 μm is costless. If the thickness is less than 2.0 μm, it is difficult to apply uniformly, and the effect of preventing tampering with the eraser cannot be obtained.
It is more desirable that the thickness be at least μm. This material includes polyester, polyester urethane, epoxy,
It is preferable to use a transparent thermoplastic resin such as acrylic alone or a mixture thereof. Specifically, the low TG thin film layer 1
As the material 8, a material having a glass transition point or a softening point of 20 ° C. or less may be selected.
Byron 300 and the like, and a high TG thin film layer 1
As 9, a material having a glass transition point or a softening point of 50 ° C. or more is preferably selected. Byron 200 and the like can be mentioned.

It is also effective to appropriately add a lubricant such as polyethylene wax to the high TG thin film layer 19 in order to improve the friction resistance.

Further, when the information recording section 20 is provided by a printing method, even if an appropriate curing agent such as isocyanate or melamine is added to the above-mentioned thermoplastic resin and cured, the adhesion does not decrease.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the present invention will be described below with reference to the drawings. <Embodiment 1> Embodiment 1 will be described with reference to FIG. One side of a transparent polyethylene terephthalate (PET) substrate 11 is coated with a thermoplastic resin such as acrylic or polyvinyl chloride, or a molten resin of a thermosetting resin such as epoxy or unsaturated polyester by a known means such as gravure coating. The diffraction grating pattern forming layer 12 is provided by drying, and the diffraction grating pattern 13 is formed by embossing the surface of the diffraction grating pattern forming layer 12 with a stamper of a diffraction grating pattern prepared in advance, and the metal deposition layer 14 is formed on this surface. Then, a pressure-sensitive adhesive was applied to the surface by a known means such as gravure coating and dried to obtain a label material having a diffraction grating pattern. Next, a melted polyester resin is applied on the other surface of the base material 11 to a thickness of 0.8 μm and dried to form a transparent low TG thin film layer 18. Urethane resin with a thickness of 0.5
μm and dried to form a transparent high TG thin film layer 19. A pattern and character information recording section 20 was provided in a partial area on the high TG thin film layer 19 by a printing method to obtain a label having a diffraction grating pattern. An adhesive cellophane tape was stuck on the information recording section by this printing method and was forcibly peeled off, but the information recording section was not peeled off.

<Embodiment 2> An embodiment 2 will be described with reference to FIG. As shown in FIG. 2, as the label material, a diffraction grating pattern 13 was formed on the surface of the metal deposition layer 14 by a stamper, and otherwise obtained in the same manner as in Example 1. Next, a melted polyester urethane resin was applied on the other surface of the base material 11 to a thickness of 0.5 μm, dried to form a transparent low TG thin film layer 18, and further melted on this thin film layer. An acrylic resin was applied to a thickness of 0.8 μm and dried to form a transparent high TG thin film layer 19. A label having a diffraction grating pattern was obtained by providing an information recording section 20 with characters and numbers by thermal transfer using a transfer ribbon in a partial area on the high TG thin film layer 19. As a wear resistance test of this label, the information recording portion was not affected even when the label was reciprocated 1,000 times with a kanakin cotton cloth under a load of 500 g / cm ² using a Gakushin tester.

[0016]

According to the label having a diffraction grating pattern of the present invention, a low molecular weight material which bleeds on the label surface by providing a low TG thin film layer and a high TG thin film layer made of a transparent thermoplastic resin or the like on the label surface. Such impurities are masked, and blocking at the time of processing can be easily prevented.In addition, printability and label printer suitability are imparted, and the adhesion of the information recording portion recorded on the label is increased, When recording information on a label by further improving the robustness, known means such as a printing method and thermal transfer can be used, and various methods such as low cost, low running cost, and light maintenance can be realized. It has an excellent effect.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a cross section of a label having a diffraction grating pattern according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a cross section of a label having a diffraction grating pattern according to another embodiment of the present invention.

[Explanation of symbols]

10. Label having diffraction grating pattern 11 Base material (PET) 12 ...... Diffraction grating pattern formation layer 13 ... diffraction grating pattern 14 Metal deposition layer 15 …… Adhesive layer 18 Low TG thin film layer 19 High TG thin film layer 20 Information recording section

Claims (3)

(57) [Claims] 1. A transparent plastic substrate having a diffraction grating pattern forming layer, a diffraction grating pattern, a metal deposition layer,
An adhesive layer or a diffraction grating pattern forming layer, a metal deposition layer, a diffraction grating pattern, a pressure-sensitive adhesive layer laminated, while a label having a diffraction grating pattern provided with an information recording portion on the surface of the substrate, the surface of the substrate In addition, a low glass transition point thin film layer made of a thermoplastic resin having a glass transition point or softening point of room temperature or lower, and a high glass transition point thin film layer made of a thermoplastic resin having a glass transition point or softening point higher than room temperature were provided. A label having a diffraction grating pattern. 2. The glass transition point or softening point of the low glass transition point thin film layer made of the thermoplastic resin is 20 ° C. or less, and the glass transition point or softening point of the high glass transition point thin film layer made of the thermoplastic resin is 50 ° C. or less. The label having a diffraction grating pattern according to claim 1, wherein the temperature is set to not less than ° C. 3. The method according to claim 1, wherein each of the thin film layers has a thickness of at least 0.5.
The label having a diffraction grating pattern according to claim 1, wherein the label has a range of μm to 3.0 μm .