JP2006047176A - Temperature control medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a temperature control medium which uses reversible temperature-indicating agents, having different indication temperatures and can finely read temperature values between temperatures indicated by the reversible temperature-indicating agents. <P>SOLUTION: The temperature control medium has a base material 11, on which a region α12 made of only one reversible temperature-indicating agent, a region β13 made of another reversible temperature-indicating agent whose indication temperature differs from that of the above reversible temperature-indicating agent, and a region γ14 made up by bringing both the reversible temperature-indicating agents to be in piles, are arranged. The temperature control medium is brought into contact with an object whose temperature is to be measured via the base material 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a temperature management medium that reads a temperature based on a change in color.

  Conventionally, a reversible thermostat whose color changes according to a temperature change has been proposed (see, for example, Patent Document 1).

  In Patent Document 1, a meltable substance selected from aliphatic higher alcohols, fatty acids, acid amides, esters and ethers, a leuco dye, and one or more compounds selected from 4-hydroxycoumarin and derivatives thereof And various reversible thermostats containing at least α-furyldioxime have been proposed.

As a method of using these reversible thermostats, a method has been proposed in which the reversible thermostat is directly applied to the temperature-measured body, or the reversible thermostat is microencapsulated and encapsulated in the body to be measured. . And it is proposed that by changing the material of the leuco dye or aliphatic alcohol described above, the temperature (range) to be changed and the type of color can be changed in a range of, for example, -18 ° C to 65 ° C. Yes.
JP-A-63-251487

However, when conventional reversible thermostats are provided with reversible thermostats with different indicated temperatures separated on a flat surface, it is difficult to read in detail the intermediate temperature indicated by those reversible thermostats. Met.
Accordingly, the present invention provides a temperature management medium that uses reversible thermostats with different indicated temperatures and that can read the temperature finely in the intermediate temperature range indicated by those reversible thermostats. With the goal.

  In order to solve such a problem, the temperature management medium according to the present invention is composed of only one reversible thermostat and a region α consisting of only one reversible thermostat and the other reversible thermostat having a different indicated temperature from the reversible thermostat. A region β and a region γ formed by stacking the one reversible thermostat and the other reversible thermostat are arranged on a base material, and are in contact with a temperature-measured body through the base material. Yes.

With this configuration, the temperature management medium according to the present invention, for example, the color of one reversible thermostat disposed in the region α changes at the temperature t ₁ , and the other reversible thermostat in the region β ₂ is assumed to change the color. At that time, the magnitude relationship between _{t 1} and _{t 2 is,} t 1 _{<t 2, or,} t 1> be any of _{t 2,} in the intermediate temperature range of _{t 1} and _{t 2,} coats the region γ The change in the color of the reversible thermostat is clearly observed. Therefore, the temperature can be read more finely in the temperature range intermediate between t ₁ and t ₂ by observing the color change in the region γ.

  The region γ of the temperature management medium according to the present invention is preferably arranged on the side in contact with the base material, which is a reversible thermostat that develops color in a higher temperature range.

  Thus, by providing a reversible thermostat that develops color in a higher temperature range on the side in contact with the substrate as the region γ, the temperature management medium of the present invention is first cooled from the high temperature range to the low temperature range. When going, the reversible thermostat placed in the region γ first develops the color of the reversible thermostat on the side in contact with the substrate (lower side), but the color of the reversible thermostat on the side in contact with the substrate (lower side) When starting, since the upper reversible thermostat is still colorless (transparent), the color development of the lower reversible thermostat can be seen through the upper reversible thermostat.

  Next, when the upper reversible thermostat develops color before the lower reversible thermostat is completely colored, the reversible thermostat that is overcoated in the region γ Since the color development of the reversible thermostats interferes with each other, it is observed as a clear color change, so the temperature can be read more finely in the middle temperature range indicated by the upper and lower reversible thermostats. .

  As described above, the temperature management medium of the present invention uses a reversible thermostat having a different indication temperature and partially coats the reversible thermostat in the overcoated area to change the color. Therefore, the temperature can be read more finely in the intermediate temperature range indicated by the reversible thermostat having different indication temperatures. In addition, this configuration makes it possible to observe fine temperatures in multiple stages only by using two types of reversible thermostats. Therefore, the temperature management medium according to the present invention requires only two types of reversible thermostats, whereas the conventional temperature management medium uses a large number of reversible thermostats. Can also be achieved.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, this embodiment is specifically described in order to better understand the gist of the invention, and does not limit the present invention.

1A and 1B show an example of the configuration of a temperature management medium of the present invention, in which FIG. 1A is a plan view and FIG. 1B is a cross-sectional view taken along line AA ′ of FIG.
In the temperature management medium 10 shown in FIG. 1, one reversible thermostat is printed on a region α12 on one surface of a substrate 11, the other reversible thermostat is printed on a region β13, and one reversible thermostat is printed on a region γ14. The reproductive thermostat and the other reversible thermostat are overcoated. In the region γ14, a reversible thermostat that develops color in a higher temperature range is disposed on the side in contact with the substrate 11.

  The substrate 11 is not particularly limited as long as the reversible thermostat can be printed, and may be an organic material such as plastic, an inorganic material such as glass, or a metal material such as aluminum or iron. Is selected accordingly.

  The reversible temperature-indicating agent is capable of visually grasping the temperature state by coloring or decoloring when it reaches a specific temperature, and is appropriately selected depending on the temperature condition to be used. In order for the color change to be observed more vividly, the temperature indicated by the two reversible thermostats is close and the color development of the reversible thermostat that develops at a higher temperature is not completed before the temperature changes. It is desirable that the reversible thermostat that develops color starts to develop color.

  The reversible thermostat is printed on the substrate 11 by a general printing method (offset, screen printing, etc.).

  The reversible thermostat in the region γ14 may be overcoated with the same thickness as the non-overcoated regions α12 and β13. However, if the reversible thermostat is overcoated with the same thickness, the reversible thermostat is displayed. The thickness of the agent increases, the reversible thermostat protrudes, and the color change of the lower reversible thermostat becomes difficult to visually recognize. Therefore, when each reversible thermostat is overcoated with half the thickness in the regions α12 and β13, the thickness of the reversible thermostat in the region γ14 becomes the reversible thermostat in the regions α12 and β13. And the protrusion of the reversible thermostat is eliminated, and the color development of the lower reversible thermostat becomes easy to visually recognize.

  Since the color change of the reversible thermostat in the overcoated region γ14 is clearly observed, the temperature can be read more finely by applying it to the reader.

Specific examples will be described below.
〔Example〕
A polyethylene sheet having a length of 3.0 cm, a width of 2.0 cm, and a thickness of 200 μm, a reversible temperature indicating agent A (manufactured by NOF Corporation, trade name: medecyl color, indicated temperature: −10 ° C.) and reversible temperature indicating Agent B (manufactured by NOF Corporation, trade name; medecyl color, indicated temperature: −15 ° C.) is prepared, and a reversible thermostat having a length of 2.5 cm and a width of 1.0 cm is formed on one surface of the polyethylene sheet. A printing area was provided.

  First, printing is started from one end of the printing region of the reversible thermostat using the reversible thermostat A having a higher indicated temperature, and the thickness of the reversible thermostat A is 20 μm from one end to 1.0 cm. Thus, printing was performed so as to be 10 μm from 1.0 cm to 1.5 cm.

  Next, printing is started from the other end of the printing area of the reversible thermostat using the reversible thermostat B having a lower indicated temperature, and the thickness of the reversible thermostat B is 1. Printing was performed so that the thickness was 20 μm from 0 cm to 10 μm from 1.0 cm to 1.5 cm.

As described above, it consists of two reversible thermostats A and B with different indicated temperatures, and has a partially coated part, and the thickness of the reversible thermostat is 20 μm in both the single layer part and the overcoated part. Thus, a temperature control medium printed on the substrate was obtained.
Then, this temperature management medium was applied to the temperature measurement body so that the base material side was in contact with the temperature measurement object, and when the color change of the reversible temperature indicating agent in the overcoated region was applied to the reader, the reversibility was reversed. In the temperature range between −10 ° C. and −15 ° C. indicated by the temperature-indicating agents A and B, fine readings could be made at 1 ° C. intervals.

  The temperature control medium of the present invention uses two reversible temperature indicating agents whose indicated temperatures are close to each other and reads the temperature in a middle temperature range between the indicated temperatures. Not only can it be used for temperature management of pharmaceuticals and semiconductor products.

1 shows an example of an embodiment of a temperature management medium according to the present invention, where (a) is a plan view and (b) is a cross-sectional view taken along line AA ′ of (a).

Explanation of symbols

10 temperature control medium, 11 substrate, 12 region α, 13 region β, 14 region γ.

Claims (2)

Region α consisting only of one reversible thermostat,
A region β consisting only of the other reversible thermostat having a different indicated temperature from the reversible thermostat;
A temperature management medium characterized in that the one reversible thermometer and the region γ formed by superimposing the other reversible thermostat are arranged on a base material and are in contact with the temperature-measured body via the base material. . 2. The region γ is characterized in that a reversible thermostat that develops color in a higher temperature region of the one reversible thermostat or the other reversible thermostat is arranged on the side in contact with the substrate. The temperature management medium described in 1.

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