JP7159841B2 - RF tag label - Google Patents

Description

The present invention relates to an RF (Radio Frequency) tag, which is a medium used for wireless individual identification.

The use of RF tag labels in which RF tags are sealed labels is being studied for management (sales management, etc.) of microwave-cooked foods such as box lunches sold in convenience stores.

If a low flame-retardant RF tag label is affixed to a microwave food container and the microwave food is cooked as it is in a microwave oven, the RF tag label will heat up abnormally and damage the RF tag label. There is a risk of microwave food igniting. Therefore, RF tag labels used for managing microwave-cooked foods that are heated and cooked in a container in a microwave oven are required to have high flame resistance (heat resistance) against the heat generated by the microwaves emitted by the microwave oven.

As an RF tag that is resistant to microwaves emitted by microwave ovens and that is safe for the human body, in Patent Document 1, an inlay base film for mounting an antenna and an IC chip bonded to it, or an antenna and bonding to it An RF tag is disclosed in which a flame-retardant material containing a non-halogen flame-retardant material is used as at least one constituent layer material of a flame-retardant sheet covering an IC chip. In addition, Patent Document 2 discloses an RF antenna having a configuration in which an antenna conductor that functions as an antenna and an IC chip that is metal-bonded to this are sandwiched between a base material made of a flame-retardant material made of polyolefin material or ceramic material. there is

JP 2006-338563 A JP 2018-142139 A

Bento labels sold at convenience stores are obliged to print the name of the food, ingredients, expiry date, and other information. Considering the printability of the printer used for these printing, it is desirable to use flame-retardant paper as the paper base material for the sheet covering the surface of the RF tag label. , it is desirable to have a higher flame resistance to the heat generated by microwaves emitted by microwave ovens.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to improve flame resistance against heat generated by microwaves emitted from a microwave oven in an RF tag label using flame-retardant paper for the sheet covering the surface.

The present invention, which solves the above-mentioned problems, comprises a flame-retardant sheet using flame-retardant paper having self-extinguishing properties, a first adhesive layer laminated on the back surface of the flame-retardant sheet, and a plastic resin having self-extinguishing properties. An inlay consisting of at least an antenna and an IC chip to be joined to the antenna is mounted on one side of a base sheet made of metal, and the side of the base sheet on which the inlay is mounted is adhered to the flame-retardant sheet by the first adhesive layer. The flame-retardant sheet has an inlay sheet and a second adhesive layer laminated on the back surface of the inlay sheet, and the flame-retardant sheet overlaps with the inlay sheet by making the size of the flame-retardant sheet larger than the size of the inlay sheet. The RF tag label is characterized in that, in addition to the heat absorption effect of the flame-retardant sheet portion, the heat diffusion effect of the marginal portion of the flame-retardant sheet protruding from the inlay sheet can be obtained. In addition, in the present invention, since the flame-retardant sheet is used for the sheet covering the surface of the RF tag label, even if it is induction heated in a microwave oven, it only becomes warm and does not cause sparks. Printing using carbon ink It is desirable to form the antenna by:

In the RF tag label according to the present invention, in addition to the heat absorbing effect, the heat diffusing effect is obtained, so the flame resistance against the heat generated by the microwaves emitted from the microwave oven is further improved.

FIG. 4 is a diagram for explaining the structure of the RF tag label according to this embodiment; The figure explaining an inlay.

Preferred embodiments of the invention will now be described. In addition, the following description does not restrict the technical scope of the present invention, but is described to aid understanding.

FIG. 1 is a diagram for explaining the structure of an RF tag label 1 according to this embodiment. FIG. 1(a) is a diagram for explaining the layer structure of the RF tag label 1, and is a cross-sectional view taken along line A-A' in FIG. 1(a). FIG. 1(b) is a diagram for explaining the front side of the RF tag label 1, and FIG. 1(c) is a diagram for explaining the back side of the RF tag label 1. FIG.

As shown in FIG. 1(a), the RF tag label 1 includes a flame-retardant sheet 10 made of self-extinguishing flame-retardant paper, and a first adhesive layer 11 laminated on the back surface of the flame-retardant sheet 10. , an inlay 120 comprising at least an antenna 121 and an IC chip 122 bonded thereto is mounted on one side of a base sheet 123 having self-extinguishing properties, and the surface of the base sheet 123 mounted with the inlay 120 is flame-retardant by the first adhesive layer 11. It has an inlay sheet 12 adhered to the adhesive sheet 10 and a second adhesive layer 13 laminated on the back surface of the inlay sheet 12. - 特許庁

As shown in FIG. 1A, the size of the flame-retardant sheet 10 is larger than the size of the inlay sheet 12, and the inlay sheet 12 is attached to the central portion of the flame-retardant sheet 10 using the first adhesive layer 11. The entire surface of the RF tag label 1 is covered with a flame-retardant sheet 10 as shown in FIG. 1(b).

Since the size of the flame-retardant sheet 10 is larger than the size of the inlay sheet 12, as shown in FIG. On the back surface of the RF tag label 1, the second adhesive layer 13 laminated on the back surface of the inlay sheet 12 and the first adhesive layer 11 laminated on the margin 100 of the flame-retardant sheet 10 are exposed. These are used for attaching the RF tag label 1 . In the RF tag label 1 according to the present embodiment, the release paper can be laminated to protect the first adhesive layer 11 and the second adhesive layer 13 exposed on the back surface of the RF tag label 1. For 13, an acrylic, rubber or silicone adhesive can be used.

The flame-retardant paper used for the flame-retardant sheet 10 covering the surface of the RF tag label 1 means self-extinguishing paper impregnated with a filler having an endothermic effect due to dehydration reaction. Aluminum hydroxide is famous as a filler having an endothermic effect due to a dehydration reaction. Aluminum hydroxide undergoes a dehydration reaction (dehydration decomposition) at 250° C. to 350° C. The dehydration reaction exhibits a high endothermic effect.

In the RF tag label 1 according to the present embodiment, the size of the flame-retardant sheet 10 is made larger than the size of the inlay sheet 12, and the peripheral edge of the flame-retardant sheet 10 is provided with a margin 100. This is to enhance flame resistance against heat generated by waves.

Since the inlay 120 including electric parts such as an antenna 121 and an IC chip 122 is mounted on the inlay sheet 12, the inlay sheet 12 has a structure that easily generates heat due to microwaves emitted from the microwave oven. Since the flame-retardant sheet 10 used on the surface of the RF tag label 1 has a heat-absorbing effect, even if the inlay sheet 12 generates heat due to the microwaves emitted by the microwave oven, this heat will be absorbed by the inlay sheet 12 . Heat is absorbed by portions of the sheet 10 .

In addition, in the RF tag label 1 according to this embodiment, the size of the flame-retardant sheet 10 is made larger than the size of the inlay sheet 12, and the blank portion 100 is provided on the periphery of the flame-retardant sheet 10. The heat absorbed by the portion of the flame-retardant sheet 10 overlapping with the flame-retardant sheet 10 diffuses to the marginal portion 100 of the flame-retardant sheet 10 , and the diffused heat is absorbed by the marginal portion 100 of the flame-retardant sheet 10 .

Thus, in the RF tag label 1 according to the present embodiment, in addition to the heat absorption effect of the portion of the flame-retardant sheet 10 overlapping the inlay sheet 12, the margin of the flame-retardant sheet 10 protruding from the inlay sheet 12 Since the heat diffusion effect of the portion 100 is obtained, the heat generation of the RF tag label 1 is suppressed, and the flame resistance against the heat generated by the microwaves emitted from the microwave oven is further enhanced.

In addition, since the degree of flame resistance against heat generated by microwaves emitted by microwave ovens depends on the ratio of impregnating the paper with filler and the size of the flame-retardant sheet 10, the range controlled using the RF tag label 1 These values should be determined by experiments based on the cooking time of food.

By using flame-retardant paper for the flame-retardant sheet 10 that covers the surface of the RF tag label 1, and by laminating a coating layer that enhances the printability for printers on the surface of the flame-retardant sheet 10, the printability for various types of printers is improved. The RF tag label 1 can have it. For example, a coating layer that improves printability for thermal printing becomes a thermal layer containing a color developer and a leuco dye, and a coating layer that improves printability for inkjet printing becomes an ink-receiving layer for inkjet printing.

The inlay sheet 12 forming the RF tag label 1 will be described. FIG. 2 is a diagram for explaining the inlay sheet 12. FIG. As shown in FIG. 2, the inlay sheet 12 is a sheet-like medium in which an antenna 121 and an IC chip 122 to be joined thereto are mounted on at least one side of a base sheet 123 .

In order to make the RF tag label 1 highly flame-retardant against the heat generated by the microwaves emitted by the microwave oven, not only the sheet (here, the flame-retardant sheet 10) placed on the front side of the RF tag label 1 but also The sheet (here, the base sheet 123 of the inlay sheet 12) placed on the back side of the RF tag label also needs to be flame retardant.

Since the sheet placed on the back side of the RF tag label 1 does not need to have printability, a self-extinguishing plastic resin sheet can be used as the base sheet 123 of the inlay sheet 12 . PC (polycarbonate) and PVC (vinyl chloride) can be used as the self-extinguishing plastic resin.

As shown in FIG. 1, the antenna 121 of the inlay 120 mounted on the inlay sheet 12 has a surface resistance of 1 Ω/sq or more and 10 kΩ/sq or less in the loop-shaped matching circuit 121a to which the IC chip 122 is joined. It has a structure in which two radiating plates 121b and 121c connected to each other are connected. The two radiating plates 121b and 121c are arranged with the matching circuit 121a sandwiched therebetween. It is connected to the matching circuit 121a by the wave line 121e.

The antenna 121 of the inlay 120 can also be devised to increase flame resistance against heat generated by microwaves emitted by microwave ovens. For example, if the corners of the antenna 121 of the inlay 120 are rounded, discharge from the corners of the antenna 121 can be prevented. Furthermore, by increasing the distance between the wires of the antenna 121 and minimizing the capacitance of the capacitor of the antenna 121, it is possible to prevent the energy of the microwave from accumulating in the antenna 121. FIG. In FIG. 2, the radiation plate 121c on the left side is arranged farther from the matching circuit 121a than the radiation plate 121b on the right side. In the RF tag label 1 according to the present embodiment, the flame-retardant sheet 10 having an endothermic effect due to dehydration reaction is used as the sheet covering the surface of the RF tag label 1, so even if induction heating is performed in a microwave oven, the flame-retardant sheet 10 becomes warm. It is desirable to form the antenna 121 by printing with a carbon ink that does not just spark.

Reference Signs List 1 RF tag label 10 flame-retardant sheet 11 first adhesive layer 12 inlay sheet 120 inlay 121 antenna 122 IC chip 123 base sheet 13 second adhesive layer

Claims (2)

A flame-retardant sheet made of self-extinguishing flame-retardant paper, a first adhesive layer laminated on the back surface of the flame-retardant sheet, and an antenna and this on one side of a self-extinguishing plastic resin base sheet. and an inlay sheet in which an inlay consisting of at least an IC chip to be bonded is mounted, and the surface of the base sheet mounted with the inlay is adhered to the flame-retardant sheet by the first adhesive layer, and the back surface of the inlay sheet By having a laminated second adhesive layer and making the size of the flame-retardant sheet larger than the size of the inlay sheet, the portion of the flame-retardant sheet that overlaps with the inlay sheet has a heat absorption effect. In addition, the RF tag label is constructed so as to obtain a heat diffusion effect by a margin portion of the flame-retardant sheet protruding from the inlay sheet. 2. The RF tag label according to claim 1, wherein said antenna is formed by printing using carbon ink.

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